Electrical element

FIELD: electricity.

SUBSTANCE: electrical element includes two or more current-conducting elements, through which current flows, and an insulator retaining the corresponding current-conducting elements in an insulated state. Resistive body (13) is created in a circumferential direction of at least one of current-conducting elements (11) on surface of insulator (12). Resistive body (13) distributes voltage applied to surface of insulator (12) between two adjacent current-conducting elements (11), and as a result, difference of potentials, which is distributed along the surface of insulator (12), becomes equal to voltage of the beginning of the charge or is lower than it.

EFFECT: improving reliability of electrical element insulation.

14 cl, 11 dwg

 

The technical FIELD

The present invention relates to an electrical component having conductive elements held by the insulator.

PRIOR art

Currently offered various ways of increasing the reliability of insulation of electrical component such as a terminal block. For example, PTL1 describes how to create a conductive laquer-like layer (resistive body) in the border region between the insulating laquer-like layer of the main body of the insulator, which easily occurs, the concentration of the electric field, and fastening material. According to this method, the concentration of electric field can be reduced, which enables to prevent the occurrence of corona discharge and voltage interference (RIV, Radio Influence Voltage).

References

Patent literature

PTL1: Lined publication of the application in Japanese patent No. N-264052.

A BRIEF STATEMENT of the substance of the INVENTION

However, there is a probability that the method described in the document PTL1, will not reduce the electric field so that the electric discharge does not occur even in the presence of the resistive body. The result will not decrease the probability of occurrence of an electric discharge on the surface of the insulator, and the reliability of the insulation of electrical component can reduce the I.

The present invention is established with regard to this problem. The present invention is to improve the reliability of insulation of electrical component by suppressing electric discharge on the surface of the insulator.

To solve the above problems, an electrical component of the present invention includes a distribution units voltage provided at the periphery of the conductive elements on the surface of the insulator. Distribution units distribute the voltage stress applied to the surface of the insulator between a pair of adjacent conductive elements, resulting in a potential difference, distributed over the surface of the insulator is set equal to the start voltage of the discharge or less.

According to the present invention, the potential difference, distributed over the surface of the insulator can be reduced to the start voltage of the discharge or lower value by distribution units voltage provided at the periphery of the conductive elements. Thus, it is possible to reduce the electric field near with conductive elements. Accordingly, it is possible to prevent the occurrence of electrical discharge on the surface of the insulator and, thus, it is possible to improve the reliability of insulation of electrical component.

BRIEF DESCRIPTION of DRAWINGS

The invention is further explained in the description of the preferred embodiment variants of the invention with reference to the accompanying drawings, in which:

1 schematically depicts the construction of the motor 1 is installed on an electrical component 10.

Figure 2(a) depicts a General view illustrating the construction of the electrical component 10 according to the first variant implementation of the present invention.

Figure 2(b) depicts the cross-section of a pair of conductive elements 11, as shown in figure 2(a), on a plane passing through their centers.

Figure 3(a) depicts a General view illustrating the construction of the electric component 20, which is compared with the electrical component 10, as shown in figure 2.

Figure 3(b) depicts the cross-section of the two conductive elements 21 shown in Figure 3(a), on a plane passing through their centers.

Figure 3(C) depicts a graph showing the distribution of potential on the line passing through the centers of the pair of conductive elements 21 shown in Figure 3(a).

Figure 4(a) depicts a General view illustrating the construction of the electric component 20, which is compared with the electrical component 10, as shown in figure 2.

Figure 4(b) depicts the cross-section of a pair of conductive elements 21 shown in Figure 4(a), on a plane passing through their center is s.

Figure 4(C) depicts a graph showing the distribution of potential on the line passing through the centers of the pair of conductive elements 21 shown in Figure 4(a).

Figure 5(a) depicts the cross-section, illustrating the effect of reducing the electric field due to the presence of resistive bodies 13 in the electric component 10.

Figure 5(b) depicts a graph showing the distribution of potential on the line passing through the centers of the pair of conductive elements 11, shown in Figure 5(a).

6(a) depicts a General view illustrating the structure of a modified example of the electrical component 10 according to the first variant implementation of the present invention.

6(b) depicts the cross-section of a pair of conductive elements 11 shown in Fig.6(a), on a plane passing through their centers.

7(a) depicts a General view illustrating the structure of another modified example of the electrical component 10 according to the first variant implementation of the present invention.

7(b) depicts the cross-section of a pair of conductive elements 11 shown in Fig.7(a), on a plane passing through their centers.

Fig(a) depicts a General view illustrating the structure of another modified example of the electrical component 10 according to the first variant implementation of the present invention.

Fig(b) Zobrazit cross-section of a pair of conductive elements 11, shown in Fig(a), on a plane passing through their centers.

Fig.9(a) depicts a General view illustrating the construction of the electrical component 10 according to the second variant of implementation of the present invention.

Fig.9(b) depicts the cross-section of a pair of conductive elements 11 shown in Fig.9(a), on a plane passing through their centers.

Fig.9(C) shows a potential distribution on the line passing through the centers of the pair of conductive elements 11 shown in Fig.9(a).

Figure 10(a) depicts a General view illustrating the structure of a modified example of the electrical component 10 according to the second variant of implementation of the present invention.

Figure 10(b) depicts the cross-section of a pair of conductive elements 11, shown in Figure 10(a), on a plane passing through their centers.

11 depicts a General view illustrating the structure of another modified example of the electrical component 10 according to the second variant of implementation of the present invention.

DESCRIPTION of the PREFERRED embodiments of the INVENTION

The first option

1 schematically depicts the construction of the motor 1 is installed on an electrical component 10 according to this variant implementation of the present invention. Electrical components the t 10 is connected to an external device, not shown on the drawing (e.g., inverter), and to the motor 1 through the cables, causing an electrical component 10 functions as a terminal block to provide an electrical connection between the inverter and the motor 1 through the electrical component 10.

The motor 1 is a synchronous motor with permanent magnets, in which multiple phase windings (for example, the three phase windings connected in a star shape with the center at the neutral point, is wound around the stator 2. The motor 1 includes a stator 2 having a circular shape in cross section, and the rotor (propeller) 3 connected to the shaft, not shown in the drawing. The rotor 3 is mounted inside the stator 2 with the provision of the air gap between them. The stator 2 and the rotor 3 is placed in the casing 4, parts of which are as a terminal block is provided an electrical component 10.

Lead wire 5 of the coil, which is part of phase windings wound around the stator 2, is connected to the three conductive elements (electrode terminals) 11, one for each phase, which are provided in the electric component 10. Each of the conductive elements is used as the conductive means. The respective conductive elements 11 are connected to cables (drawing does not show the us), connected with the outer part of the casing 4 to connect to the inverter, resulting in corresponding conductive elements 11 to the phase windings of each phase is supplied power, the corresponding desired.

The motor 1 is driven by interaction between a magnetic field generated by the power supply three-phase alternating current in the coil of each phase from the inverter through the electrical component 10, and the magnetic field generated by the permanent magnet of the rotor. Specifically, in the motor 1 of the magnetic circuit comprises a permanent magnet embedded in the rotor 3, the magnetic body plate of the electromagnetic steel)forming the rotor 3, as such, and the magnetic body plate of the electromagnetic steel)forming the stator 2. When the magnetic flux from a permanent magnet and an alternating magnetic flux generated when electric current flows in the phase winding under the control of the inverter, pass through the magnetic circuit, there is torque generated by the electromagnetic energy, which leads to rotation of the rotor 3 and the shaft connected to the rotor 3.

Figure 2 depicts a General view illustrating the construction of the electrical component 10 according to this variant implementation of the present invention. Electrical component 10 consists of Ecopravo the yaschih elements 11, insulator 12 (employee insulating means and resistive bodies 13. In this embodiment of the present invention, it is assumed that the electrical component 10 is a terminal block and includes three conductive element 11 corresponding to three phases, as shown in figure 1. Although for convenience in the further consideration of the electrical component 10 is described, mainly, a pair of adjacent conductive element 11 as main parts, similar considerations can also be applied to the remaining conductive element 11.

Each of the conductive elements 11 consists of a material having electrical conductivity, for example, a metal material through which electric current flows. The respective conductive elements 11 are combined into a single unit with the insulator 12 by means of wheels, such as alloy wheels with insert. For example, when casting in the insulator 12 is inserted nut, after which the nuts fasten the bolts to form conductive elements 11.

The insulator 12 is composed of an insulating material such as resin. The conductive elements 11 are placed in the metal mold, after which the form is filled with resin, which is subjected to curing, which allows to form the insulator 12 to a predetermined shape. The insulator 12 is holding ratio is eastwoodiae conductive elements 11 in the isolated state, in this part of the respective conductive elements 11 protrudes above the surface.

Resistive body 13 provide in areas of the outer edges of the conductive elements 11 on the surface of the insulator 12. Specifically, the resistive body 13 to provide on the surface of the insulator 12 so that they are surrounded on the periphery of the conductive elements 11, including the area of their outer edges. In other words, the resistive body 13 provide so that they were held at a predetermined distance from the edges of the conductive elements 11 in the radial direction, surrounding these conductive elements 11. According to a variant of implementation of the present invention, the resistive body 13 is configured with the ability to have the outer edge of round shape. To attach the resistive body 13 to the surface of the insulator 12, provide adhesion to the surface of the insulator 12, for example, using an adhesive. Alternatively, to attach the resistive body 13 to the surface of the insulator 12, they can be combined into a single unit with the insulator 12 by molding with insert, similar to the conductive elements 11.

In the electric component 10 with the surface of the insulator 12 is coupled ion impurity 14 dissipated in the environment when using this electrical component 10. Resistive the body 13 distribute voltage, applied to the surface of the insulator 12 through ion impurity 14, resulting in these bodies 13 to reduce the electric field near with conductive elements 11. In particular, in this embodiment of the present invention, in order properly to ensure the reduction of the electric field, the resistive body 13 is made of any one material or a composite material to obtain a predetermined value R of the resistance. Next, the resistive body 13 in more detail.

The effect of reducing the electric field due to resistive bodies 13 provided in the electric component 10 according to this variant implementation of the present invention will be discussed with reference to Fig.3-5. Figure 3 and 4 shows explanatory diagrams for the electrical component 20, which is compared with the electrical component 10, as shown in figure 2. Figure 5 depicts a graph showing the effect of reducing the electric field due to resistive bodies 13 of the electrical component 10 according to this variant implementation.

First consider the case when the electric component 20 is composed of the conductive elements 21 and insulator 22. With the surface of the insulator 22 is coupled ion impurity 24 dissipated in the environment when using this electrical component 20. Ion p is IMEs 24 absorbs moisture and turns into a liquid state due to increasing humidity environment, resulting gains conductivity. In the construction in which the surface of the insulator 22 against each other is a pair of conductive elements 21 on the surface of the insulator 22 through ionic impurity 24, which absorbed the moisture and turned into a liquid state, leakage current flows (figure 3(b) is shown by an arrow). As shown in Figure 3(C), the stress applied to the surface of the insulator 22, concentrated in the areas adjacent to the conductive elements 21. As a result, in areas adjacent to the conductive elements 21, on the surface of the insulator 22 increases the probability of occurrence of electric discharge.

To reduce the electric field near with conductive elements 21, in areas of the outer edges of the conductive elements 21 on the surface of the insulator 22 provide a resistive body 23, as shown in Figure 4(a) and 4(b). As shown in Figure 4(C), the resistive body 23 is partially distribute the voltage, causing the voltage applied on the periphery of the resistive bodies 23 on the surface of the insulator 22 (hereinafter called "the stress applied on the periphery"), decreases. Consequently, the equivalent reduces the electric field near with conductive elements 21.

However, even if just to provide a resistive body 23 in the areas of the outer edges of the conductive elements 21, it is Timo to reduce the voltage, attached at the periphery to the voltage Vs of the beginning of the discharge or lower value to ensure the reduction of the electric field sufficient to suppress air discharge. Thus, the resistive body 13 in the electric component 10 according to this variant implementation of the present invention, configured to provide means for reducing the electric field sufficient to suppress air discharge. Namely, the resistance value of resistive bodies 13 is determined by comparing the voltage Vs of the beginning of the discharge voltage applied between the pair of adjacent conductive elements 21, with the subsequent calculation of the voltage values, which must be distributed resistive bodies 13, and then on the basis of the calculated values of the voltage, type and amount of ionic impurities, and the leakage current is defined in accordance with the humidity of the environment.

Further detail resistive body 13 according to this variant implementation of the present invention. If we turn to Figure 5, in the cross section perpendicular to the direction of flow of leakage current through the ionic impurity 14, the leakage current i per unit area receive according to the following formula:

i=n×F×c×Dmsqrt> π×t(1)

In this formula, n is the valence of the ions arising from the absorption of moisture by admixture and the transition to a liquid state, and F is the Faraday constant. In addition, the concentration of the aqueous admixture having a vapor pressure that is identical to the ambient atmosphere, and D is the diffusion coefficient of ions that occurs when the moisture absorption by the impurity and the transition to a liquid state. Next, t is the time of current flow.

The leakage current i tends to saturation with the achievement of a constant value corresponding to the duration of current flow. In this case, if the thickness of the diffusion layer is set as the proportional constant ka, the mathematical formula 1 can be replaced by the following formula:

i=ka×n×F×c×D(2)

When using the degree P of adhesion of impurities insulator 12 per unit surface area, the thickness of the aqueous solution arising from the absorption of moisture by admixture and the transition to a liquid state, receive according to the following formula:

t=Pc(3)

Thus, the current I leak based on a single the Itza length in the direction of the electric field at the periphery of the conductive elements 11 is determined by the following formula, regardless of the applied voltage:

I=i×t(4)

As a result, the value R of the resistance of the resistive bodies 13 per unit length in the direction of the electric field at the periphery of the conductive elements 11, which are required to suppress the occurrence of electric discharge on the surface of the insulator 12, receive according to the following formula, using the voltage V, applied between the conductive elements 11:

R=V2-VSI(5)

In this mathematical formula Vs represents the limiting voltage of the start of discharge by the Paschen law and is approximately 300 in the environment of normal temperature and atmospheric pressure.

According to a variant of implementation of the present invention, as described above, on the surface of the insulator 12 on the periphery of the conductive elements 11 provide a resistive body 13. Resistive body 13 have the value R of the resistance, which is observed following condition: the surface of the insulator 12, the voltage applied on the periphery of the resistive bodies 13 (stress applied on the periphery), becomes ravimapula Vs early discharge or less.

According to such construction, on the surface of the insulator 12 on the periphery of the conductive elements 11 provide a resistive body 13 having a resistance value R, defined appropriately. Thanks resistive bodies 13, it is possible to accomplish reduction of the voltage applied on the periphery, to the voltage Vs of the beginning of the discharge or smaller values, which cannot be achieved in the case when the periphery of the conductive elements 11 just provide a resistive body (see Figure 5(b)). Thus, at a sufficient level to ensure the reduction of the electric field near with conductive elements 11. Accordingly, it is possible effectively to suppress the occurrence of electric discharge on the surface of the insulator 12 and, thus, it is possible to improve the reliability of insulation of electrical component 10.

In this embodiment, the present invention resistive body 13 to provide on the surface of the insulator 12 so that they are surrounded on the periphery of the conductive elements 11, including the area of their outer edges. According to this design, the resistive body 13 distribute stress applied to the surface of the insulator 12 between two adjacent conductive elements 11, resulting in a potential difference (voltage, is applied on the periphery), raspredelenie the I on the surface of the insulator, becomes equal to the voltage Vs of the beginning of the discharge or less. That is, the resistive body 13 function as a distribution unit voltage (medium voltage distribution)that allows to sufficiently ensure the reduction of the electric field and, optionally, an effective way to suppress the occurrence of electric discharge on the surface of the insulator 12.

Here's the modified example of resistive bodies 13 of the electrical component 10 according to the first variant implementation of the present invention. When considering a modified example of items that are identical to above, will be denoted by the same symbols, and their consideration will not be repeated. Below will be considered, mainly differences from the above options.

The first modified example

6 schematically depicts a modified example of the electrical component 10 according to the first variant implementation of the present invention. In this modified example, the appropriate width x (length in the radial direction) of resistive bodies 13. Specifically, on the basis of the shortest distance between the pair of adjacent conductive elements 11, determine the width at which the voltage applied on the periphery, becomes equal to the hapryazhenie Vs early discharge or less, thus defined, the width becomes the width x of resistive bodies 13.

Forth in detail the method of determining the widths x of resistive bodies 13. Specifically, the width x of resistive bodies 13 is obtained using the Paschen law, on the basis of the relationship between the voltage applied between the conductive elements 11, and the maximum voltage Vs of the start of discharge by the Paschen law (see mathematical formula 6).

V2-VS=B×p×xlnA×p×xln(1+1Gma)(6)

In this formula, p is the atmospheric pressure, a and B are constants for determining the coefficient of ionization of the gas in the collision. In addition, Gma - coefficient of secondary emission of electrons.

According to this example, as described above, the width determined on the basis of the shortest distance between two adjacent conductive elements 11, which allows you to specify the width x of resistive bodies 13 minimum. Accordingly, it is possible to prevent increase in size of the electrical component 10 while preventing the occurrence times the poison at a sufficient level.

The second modified example

7 schematically depicts another modified example of the electrical component 10 according to the first variant implementation of the present invention. In this modified example, only one of the pair of conductive elements 11 provided with a resistive body 13. In the preferred case, one of the pair of conductive elements 11, provided with a resistive body 13 is a conductive element 11 located on the side of high potential. The basis of this scheme is the understanding that an electrical discharge occurs easier in the conductive element 11 located on the side of higher potential than that of the conductive element 11 located on the side of low potential.

In other words, according to this example, since only one of the conductive elements 11 provided with a resistive body 13, it is possible to prevent the increase in cost associated with the increase in the number of components. Furthermore, since the resistive body 13 provided with the conductive element 11 located on the side of high potential, which is particularly easy to occur electric discharge, it is possible to prevent electric discharge at a sufficient level. Accordingly, it is possible to improve the reliability of the insulation of electrical component 10.

p> In the case of the terminal block for connection of the three phases, the conductive element 11 located on the side of high potential among the three conductive elements 11, periodically for changes. Thus, this modified example is effective for the electrical component 10, in which the potential of the conductive elements 11 is not changed.

The third modified example

Fig schematically depicts another modified example of the electrical component 10 according to the first variant implementation of the present invention. In this modified example, in the area of the outer edge of each conductive element 11 on the surface of the insulator 12 is applied coating material to form a corresponding resistive body 13. Such a coating material is provided as a resistive bodies 13 has a resistance value R, defined in a suitable manner, resulting in the voltage applied in each zone ionic impurities 14 adjacent to the conductive elements 11, is reduced to the voltage Vs of the beginning of the discharge or lower value, as described above. As the coating material it is possible to use a material having electrical conductivity. For example, it is possible to apply the coating material containing the metal powder. In this case, the coating material used in predpochtite the flax case, includes a metal with a low probability of occurrence of electromigration.

According to this modified example, in order to obtain the corresponding resistive body 13, causing the coating material having electrical conductivity. As a result, since the resistive body 13 can be formed using a simple method, you can easily improve the reliability of insulation of electrical component 10.

Areas in which the applied coating material to obtain the corresponding resistive bodies 13, you can limit the width x, as described in the first modified example. Alternatively, the coating may be provided on only one of the conductive elements 11, depending on the type of the terminal block, as described in the third modified example.

The second option

Figure 9 schematically depicts the design of the electrical component 10 according to the second variant of implementation of the present invention. Further, the elements identical to the first variant of implementation, will be denoted by the same symbols, and their consideration will not be repeated. Below will be considered, mainly differences from the first version. In this embodiment of the present invention, it is assumed that the electrical component 10 is a terminal block and includes three Toko is routashi element 11, the respective three phases. Although for convenience in the further consideration of the electrical component 10 is described mainly two adjacent conductive element 11 as main parts, similar considerations can also be applied to the remaining conductive element 11.

Electrical component 10 according to this variant implementation of the present invention, consists of conductive elements 11, an insulator 12 and electrical conductors 15. Each of the electrical conductors 15 serves as a distribution unit stress (stress distribution). Electrical conductors 15, as one of the distinguishing features of this variant implementation, provided on the periphery of the conductive elements 11 on the surface of the insulator 12. Specifically, the electrical conductors 15 are in the form of a loop and is surrounded by the conductive elements 11, while being located at a predefined distance from the periphery of these elements 11. Electrical conductors 15 configured to have an annular shape. To attach the electrical conductors 15 to the surface of the insulator 12, provide adhesion to the surface of the insulator 12, for example, using an adhesive. Alternatively, to attach the electrical conductors 15 to the surface of the system of 12, they can be inserted into the insulator 12 by molding with insert together with the nuts included in the conductive elements 11.

Figure 9 electrical component 10 includes one electrical conductor 15 for each conductive element 11. However, in accordance with the following principle may be provided with any number of electrical conductors 15. Namely, the number n of electrical conductors 15, secured in the conductive elements 11, receive, based on the voltage applied between the pair of adjacent conductive elements 11, and the voltage Vs of the beginning of the discharge obtained using the Paschen law. The voltage Vs of the beginning of the discharge obtained using the Paschen law, represented by the following formula:

VS=B×p×x1lnA×p×x1ln(1+1Gma)(7)

In this mathematical formula p is the atmospheric pressure, a and B are constants for determining the coefficient of ionization of the gas in the collision. In addition, Gma - coefficient of secondary electron emission, and x1 is the distance between elements, with time the awn potentials.

Thus, the number n of electrical conductors 15 is calculated using the voltage applied between the conductive elements 11, and the voltage Vs of the beginning of the discharge according to the following formula:

n=VVS×2(8)

If the number n is not natural, as the number n of electrical conductors 15 are preferably take the nearest integer that is greater than n.

The distance x1 as a parameter specified in a mathematical formula 7, determine, based on the behavior of rolling liquid ionic impurities 14 generated on the surface of the insulator 12. However, the behavior of rolling liquid ionic impurity 14 is substantially influenced by the environment in which the insulator 12. It may be difficult to unambiguously determine the distance x1. In this case, the number n can be calculated by the following formula, taking the lower limit voltage Vs early discharge approximately 300 In:

n=V300×2(9)

When the value calculated by mathematical formula 9 is not genuine cowhide leather-makes the m number as the number n of electrical conductors 15 are preferably take the nearest integer that is greater than n.

According to a variant of implementation of the present invention, as described above, the electrical conductors 15 ensure compliance with the conditions under which each of the voltage dV, applied on the respective peripheries of the conductive elements 11 and electrical conductors 15 on the surface of the insulator 12, is set equal to the voltage Vs of the beginning of the discharge or less.

With this design, the electrical conductors 15 distribute the stress applied between the pair of adjacent conductive elements 11 on the surface of the insulator 12 (act means the stress distribution). Thus, as shown in Fig.9(C), each of the voltages applied to the respective peripheries of the conductive elements 11 and electrical conductors 15 becomes equal to the voltage Vs of the beginning of the discharge or less. In other words, each of the differences of potentials (voltages dV attached on the periphery), distributed over the surface of the insulator 12, can be reduced to the voltage Vs of the beginning of the discharge or smaller values. Accordingly, since it is possible to sufficiently ensure the reduction of the electric field, can effectively suppress the occurrence of electric the practical discharge on the surface of the insulator 12. As a consequence, effective to prevent the occurrence of electric discharge on the surface of the insulator 12, it is possible to improve the reliability of insulation of electrical component 10.

According to a variant of implementation of the present invention provide one or more electrical conductors 15, located concentric with the respective conductive elements 11. The number n of electrical conductors 15 determines, on the basis of the voltage V, applied between two adjacent conductive elements 11 on the surface of the insulator 12, and the voltage Vs of the beginning of the discharge.

With this design, since the number n of electrical conductors 15 set appropriately, it is possible to reduce each of the difference of potential (voltage dV attached on the periphery), distributed over the surface of the insulator 12 to the voltage Vs of the beginning of the discharge or smaller values. As a result, it is possible effectively to suppress the occurrence of electric discharge on the surface of the insulator 12.

Note that the electrical conductors 15 according to this variant implementation of the present invention, can, at least, to have electrical conductivity, and can be a resistive body having a predetermined electrical resistance. Even if the electrical conductors fonctionnait as the resistive body, you can at a sufficient level to ensure the reduction of the electric field. Accordingly, it is possible effectively to prevent the occurrence of electrical discharge on the surface of the insulator 12.

Here's the modified example of electrical conductors 15 in the electric component 10 according to the second variant of implementation of the present invention.

The fourth modified example

Figure 10 schematically depicts a modified example of the electrical component 10 according to the second variant of implementation of the present invention. In this modified example, the electrical conductor 15 is a cylindrical metallic element. An electrical conductor 15 is secured by means of casting with an insert so that he was surrounded by the conductive element 11, while it is embedded in the insulator 12 so that its tail section was performed from the surface of the insulator 12. In this case, the height of which is an electrical conductor 15, is preferably set smaller than the height of the conductive element 11.

In this example, the electrical conductor 15 is provided with only one of the two conductive elements 11. In the preferred case, one of the pair of conductive elements 11 are supplied with an electrical conductor 15, is a conductive El the element 11, located on the side of high potential. The basis of this scheme is the understanding that an electrical discharge occurs easier in the conductive element 11 located on the side of higher potential than that of the conductive element 11 located on the side of low potential.

As shown in Figure 10(b), each of the distance Da between the conductive elements 11 and an electrical conductor 15 set corresponding to each other by the shortest distance between the pair of adjacent conductive elements 11. If the distance (shortest distance) between the conductive elements 11 be defined as Db, the distance Da is calculated by the following formula:

Da=DbN+1(10)

In this mathematical formula N is the number of electrical conductors 15, available between a pair of conductive elements 11. If each of the two conductive elements 11 provided with an electrical conductor 15, each of the distance between the conductive elements 11 and electrical conductors 15 and the distance between adjacent electrical conductors 15 in the preferred case, the set corresponding to each other.

According to this modified example, the electrical conductor is 15 therefore, to the distance Da between the conductive elements 11 and electrical conductors 15 (and, depending on the situation, the distance between adjacent cylindrical electrical conductors 15) corresponded to each other. With this design, as it is possible to prevent local dry condition, it is possible to prevent a local increase or decrease of the voltages applied to the respective peripheries of the conductive elements 11 and electrical conductors 15. As a consequence, each of the voltage dV attached at the periphery can be reduced to the voltage Vs of the beginning of the discharge or lower value and can effectively prevent the occurrence of electrical discharge on the surface of the insulator 12. In addition, an electrical conductor 15 is a cylindrical metallic element, that is, the insulator 12 can provide an electrical conductor 15 having a simple structure.

In addition, since the electrical conductor 15 provide only one conductive element 11, it is possible to avoid increasing the cost associated with increasing the number of components. Additionally, it is possible effectively to suppress the occurrence of electric discharge in close proximity to the conductive element 11 located on the side of the high potential at which electricity shall such discharge occurs especially easily.

In the example described above, the electrical conductor 15 provide only one of the conductive elements 11. However, when an electrical conductor 15 is provided at each of the two conductive elements 11, it is preferable to provide more of these electrical conductors 15 in the conductive element 11 located on the side of the high potential at which electric discharge occurs especially easily. By increasing the number of electrical conductors 15, can effectively suppress the occurrence of electric discharge near the conductive element 11 located on the side of the high potential at which electric discharge occurs especially easily.

In the case when the electric conductor 15 provide only one of the conductive elements 11 located on the side of high potential, this modified example is effective for the electrical component 10 (e.g., terminal block for connection to the DC circuit)in which the potential of the conductive elements 11 is not changed.

The fifth modified example

11 schematically depicts another modified example of the electrical component 10 according to the second variant of implementation of the present invention. In this modified example, along the PE Iveria respective conductive elements 11 on the surface of the insulator 12 are coated, to form the electrical conductors 15 of the ring shape. The number of coatings provided as electrical conductors 15, set in a suitable manner, so that the stress applied on the periphery of the conductive elements 11 has decreased to the voltage Vs of the beginning of the discharge or lower value, as described above. As a material of such coatings can be used a material having electrical conductivity. For example, it is possible to apply the coating material containing the metal powder. In this case, the coating material used in the preferred case, includes a metal with a low probability of occurrence of electromigration.

According to this modified example, in order to receive electrical conductors 15, put a coating of material having electrical conductivity. With this design, the electrical conductor 15 can be formed using a simple method, resulting in easy to improve the reliability of insulation of electrical component 10.

Although there has been described an electrical component according to certain variants of implementation of the present invention, this invention is not limited to the above variants of its implementation, and it is possible to make various modifications without going beyond its scope. For example, electricity is the second component is not limited to the terminal block, and the present invention can be applied for various purposes until the electrical component includes conductive elements within the insulator, for example, a terminal provided on the substrate of the electrical circuit.

The full contents of the application for Japanese patent No. R-133535, filed on June 11, 2010, and claims of Japanese patent No. R-057353, filed on March 16, 2011, this reference is included in the text of this specification.

INDUSTRIAL APPLICABILITY

The present invention differs in that the periphery of at least one of the conductive elements 11 on the surface of the insulator 12 provide the element distribution voltage. The element voltage distribution distributes the stress applied to the surface of the insulator 12 between the pair of adjacent conductive elements 11, resulting in a potential difference, distributed over the surface of the insulator 12 becomes equal to the start voltage of the discharge or less. Thus, it is possible to reduce the electric field near with conductive elements. Accordingly, it is possible to prevent the occurrence of electrical discharge on the surface of the insulator and, as a consequence, it is possible to improve the reliability of insulation of electrical component. Therefore, an electrical component according to the present invention can be applied in industrial the property.

For a LIST of SYMBOLS

1 - Motor

2 - Stator

3 - Rotor

4 - Casing

5 - Lead wire coil

10 is an electrical component

11 - Conductive element

12 - Insulator

13 - resistive body

14 - Ionic impurity

1. An electrical component, comprising:
two or more conductive elements through which current can flow;
an insulator holding the respective conductive elements in an isolated state; and
- the resistive body, provided on the periphery of at least one of the conductive elements on the surface of the insulator,
moreover, the resistive body has such a resistance value, in order to observe the condition, when the voltage applied to the periphery of the resistive body on the surface of the insulator is set equal to the start voltage of the discharge or less.

2. An electrical component according to claim 1, in which the resistive body is provided on the surface of the insulator so that it is surrounded on the periphery, at least one of the conductive elements.

3. An electrical component according to claim 1 or 2, in which the range of the width of the resistive body is defined so that the voltage applied to the periphery, was equal to the start voltage of the discharge or less when the shortest distance between two adjacent comprobadas and elements.

4. An electrical component according to claim 3, in which the resistive body is provided at the conductive element on the side of the high potential of the pair of adjacent conductive elements.

5. An electrical component according to claim 1, in which the resistive body formed by applying a coating material having electrical conductivity.

6. An electrical component, comprising:
two or more conductive elements through which current can flow;
an insulator that holds the corresponding conductive elements in an isolated state; and
at least one electrical conductor surrounding at least one of the conductive elements and located separately from the periphery of at least one of the conductive elements on the surface of the insulator,
moreover, at least one electrical conductor, provided that each of the voltages applied to the respective peripheries of the conductive elements and at least one electrical conductor on the surface of the insulator is set equal to the start voltage of the discharge or less.

7. An electrical component according to claim 6, in which one or more electrical conductors provided with concentric, at least one of the conductive elements and the number of electrical conductors is determined based on what atragene, applied between the pair of adjacent conductive elements on the surface of the insulator, and the start voltage of the discharge.

8. An electrical component according to claim 6 or 7, in which at least one electrical conductor is located so that each distance between the conductive elements and at least one electrical conductor line with each other at the shortest distance between the pair of adjacent conductive elements.

9. The electrical component of claim 8, in which an electrical conductor is provided in each of a pair of conductive elements and the corresponding electric conductors are arranged so that each distance between the conductive elements and the electrical conductors and the distance between adjacent electrical conductors correspond to each other.

10. An electrical component according to claim 6, in which electric conductors are provided with more than one conductive element on the side of higher potential than the other conductive element-side low potential of the pair of adjacent conductive elements.

11. An electrical component according to claim 6, in which at least one electrical conductor formed by inserting the cylindrical insulator of the metal element.

12. Electrical components the t 6, in which at least one electrical conductor formed by coating a coating material having electrical conductivity.

13. An electrical component according to claim 6, in which at least one electrical conductor includes a resistive body.

14. An electrical component, comprising:
two or more conductive elements through which current can flow;
an insulator holding the respective conductive elements in an isolated state; and
- distribution unit voltage provided on the periphery of at least one of the conductive elements on the surface of the insulator,
moreover, the distribution unit voltage distributes the stress applied to the surface of the insulator between a pair of adjacent conductive elements, so that the potential difference, distributed over the surface of the insulator is set equal to the start voltage of the discharge or less.



 

Same patents:

FIELD: electricity.

SUBSTANCE: connecting surfaces (12) of a connecting electrode (10) have flat shape. Connecting devices (12, 12') comprise a conducting insert (24) in a crushable insulating elastomer (14), cast and coated with a screen (20). Connecting surfaces (26, 28) of conducting inserts (24) are arranged with displacement relative to connecting surfaces (16, 18) of an insulating support (14). After the connection has been made, insulating surfaces (16, 16') contact with each other, and compression is carried out, making it possible to implement an air impermeable connection, at the same time conducting surfaces (26, 26') enter in contact with each other. The unit is in compressed condition with the help of a central screw (50), which is preferably connected with a locking device (52), for the connecting surface (18), not used for electric connection.

EFFECT: simplified connection between electric devices, higher speed, flexibility and reliability of a connection due to simplification of an allowance for terminals arrangement, and provides for levelling by arrangement of connected poles.

19 cl, 4 dwg

FIELD: electrical engineering.

SUBSTANCE: plug-in HV input (D) serves for connection of a current lead to the HV installation component (T) filled with an insulating medium and encapsulated inside a metal housing. The input is designed to be rotationally symmetrical relative to axis (A) and contains a centrally position current lead (10), a field control device and (enveloping the current lead) an insulator (20) with a tapering section (21) that, after the input (D) insertion into the plug-in part (60) covering the component (T) in a manner impermeable for the insulating medium, dielectrically strengthens the gap (F) positioned between the plug-in part (60) insulating bushing (64) and the insulator (21) tapering section. The field control device is designed as a capacitor roll (40), the capacitor roll (40) containing capacitor armatures (41) electrically insulated from each other, retained (in the radial direction) by an insulating film (42) with a gap relative to each other and embedded into the insulator (20) by way of the capacitor roll (40) sealing in consolidated polymer mass; the capacitor armatures (41) pass through the installation flange (30) towards the insulator (20) tapering section (21).

EFFECT: creation of an input of comparatively simple and robust design, applicable for efficient control of active electric field in case of the input operating at very high operational voltages.

13 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: electric connecting element (1) for connection of at least a conductor (6) with a circuit board (10) comprises a body (2), at least one gripping connector (5) for the conductor (6), and also at least two connecting terminals (3) for a connection with the circuit board (10), preferably the one suitable for soldering. The body (2) on the lower side (2a) that faces the circuit board (10) in the mounting position has at least one protruding separating element (4) of an insulating material, which at least on sections between the connecting terminals (3) and in the mounting position passes through the circuit board (10). At the same time even in case there is a distance between the connecting terminals (3), which is less than prescribed by according standards for safe gaps, a sufficient protection is ensured against a hazard of breakthrough between the energised connecting terminals (3).

EFFECT: realisation of an electric connecting element with smaller dimensions.

19 cl, 8 dwg

Electric connector // 2306645

FIELD: electrical engineering.

SUBSTANCE: proposed electric connector has corrugated shielding member in the form of flexible bellows tightly closed on both ends with shrouds provided with through holes forming common space with inner cavity of bellows filled with mixture of neutrally reduced gases wherein electric conductor in the form of stranded wire is disposed to protect it against oxidation in chemically active medium at enhanced temperature, its conservative length being placed within bellows varying its length and shape when contact members are moving. Stranded wire ends are compressed to form washers with holes which are tightly secured by means of contact members within shrouds. Both ends of stranded wire are passed through shroud holes and secured therein by molding to allow for gas passage through space between wire strands.

EFFECT: enhanced resistance of connector to electric loads in chemically active media at enhanced temperature.

3 cl, 3 dwg

FIELD: electrical engineering; high-voltage connectors for power distribution systems.

SUBSTANCE: connector shroud with through passage has first layer abutting against this passage, second layer enclosing first one and made of thermoplastic elastomer (TPE insulating material), and third layer enclosing second one and made of low-conductivity material (below 108 Ohm-cm) which can be also made of TPE material. TPE layers are press-fitted one on top of other.

EFFECT: facilitated manufacture, enhanced electrical characteristics.

23 cl, 13 dwg

FIELD: electrical engineering; connectors for cable including those used in explosive and gas-laden areas.

SUBSTANCE: proposed explosion-proof connector has plug section shroud and socket section shroud accommodating plugs and sockets, respectively. Cable conductors are soldered to plug pins and socket jacks and sealed in shrouds by means of sealing compound. Shrouds of plug and socket sections are joined together by threaded bracing bushing provided with lock nut to prevent their spontaneous turn-out. Translational movement of bracing bushing along connector axis is limited on one end by projection provided on socket section shroud and on other end, by lock ring. Socket section shroud has groove to receive packing.

EFFECT: simplified design, enhanced reliability of explosion protection due to reliable sealing.

1 cl, 1 dwg

Plug connection // 2231184
The invention relates to a plug connection for connecting a cable in underground mining

FIELD: electrical engineering; connectors for cable including those used in explosive and gas-laden areas.

SUBSTANCE: proposed explosion-proof connector has plug section shroud and socket section shroud accommodating plugs and sockets, respectively. Cable conductors are soldered to plug pins and socket jacks and sealed in shrouds by means of sealing compound. Shrouds of plug and socket sections are joined together by threaded bracing bushing provided with lock nut to prevent their spontaneous turn-out. Translational movement of bracing bushing along connector axis is limited on one end by projection provided on socket section shroud and on other end, by lock ring. Socket section shroud has groove to receive packing.

EFFECT: simplified design, enhanced reliability of explosion protection due to reliable sealing.

1 cl, 1 dwg

FIELD: electrical engineering; high-voltage connectors for power distribution systems.

SUBSTANCE: connector shroud with through passage has first layer abutting against this passage, second layer enclosing first one and made of thermoplastic elastomer (TPE insulating material), and third layer enclosing second one and made of low-conductivity material (below 108 Ohm-cm) which can be also made of TPE material. TPE layers are press-fitted one on top of other.

EFFECT: facilitated manufacture, enhanced electrical characteristics.

23 cl, 13 dwg

Electric connector // 2306645

FIELD: electrical engineering.

SUBSTANCE: proposed electric connector has corrugated shielding member in the form of flexible bellows tightly closed on both ends with shrouds provided with through holes forming common space with inner cavity of bellows filled with mixture of neutrally reduced gases wherein electric conductor in the form of stranded wire is disposed to protect it against oxidation in chemically active medium at enhanced temperature, its conservative length being placed within bellows varying its length and shape when contact members are moving. Stranded wire ends are compressed to form washers with holes which are tightly secured by means of contact members within shrouds. Both ends of stranded wire are passed through shroud holes and secured therein by molding to allow for gas passage through space between wire strands.

EFFECT: enhanced resistance of connector to electric loads in chemically active media at enhanced temperature.

3 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: electric connecting element (1) for connection of at least a conductor (6) with a circuit board (10) comprises a body (2), at least one gripping connector (5) for the conductor (6), and also at least two connecting terminals (3) for a connection with the circuit board (10), preferably the one suitable for soldering. The body (2) on the lower side (2a) that faces the circuit board (10) in the mounting position has at least one protruding separating element (4) of an insulating material, which at least on sections between the connecting terminals (3) and in the mounting position passes through the circuit board (10). At the same time even in case there is a distance between the connecting terminals (3), which is less than prescribed by according standards for safe gaps, a sufficient protection is ensured against a hazard of breakthrough between the energised connecting terminals (3).

EFFECT: realisation of an electric connecting element with smaller dimensions.

19 cl, 8 dwg

FIELD: electrical engineering.

SUBSTANCE: plug-in HV input (D) serves for connection of a current lead to the HV installation component (T) filled with an insulating medium and encapsulated inside a metal housing. The input is designed to be rotationally symmetrical relative to axis (A) and contains a centrally position current lead (10), a field control device and (enveloping the current lead) an insulator (20) with a tapering section (21) that, after the input (D) insertion into the plug-in part (60) covering the component (T) in a manner impermeable for the insulating medium, dielectrically strengthens the gap (F) positioned between the plug-in part (60) insulating bushing (64) and the insulator (21) tapering section. The field control device is designed as a capacitor roll (40), the capacitor roll (40) containing capacitor armatures (41) electrically insulated from each other, retained (in the radial direction) by an insulating film (42) with a gap relative to each other and embedded into the insulator (20) by way of the capacitor roll (40) sealing in consolidated polymer mass; the capacitor armatures (41) pass through the installation flange (30) towards the insulator (20) tapering section (21).

EFFECT: creation of an input of comparatively simple and robust design, applicable for efficient control of active electric field in case of the input operating at very high operational voltages.

13 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: connecting surfaces (12) of a connecting electrode (10) have flat shape. Connecting devices (12, 12') comprise a conducting insert (24) in a crushable insulating elastomer (14), cast and coated with a screen (20). Connecting surfaces (26, 28) of conducting inserts (24) are arranged with displacement relative to connecting surfaces (16, 18) of an insulating support (14). After the connection has been made, insulating surfaces (16, 16') contact with each other, and compression is carried out, making it possible to implement an air impermeable connection, at the same time conducting surfaces (26, 26') enter in contact with each other. The unit is in compressed condition with the help of a central screw (50), which is preferably connected with a locking device (52), for the connecting surface (18), not used for electric connection.

EFFECT: simplified connection between electric devices, higher speed, flexibility and reliability of a connection due to simplification of an allowance for terminals arrangement, and provides for levelling by arrangement of connected poles.

19 cl, 4 dwg

Electrical element // 2524379

FIELD: electricity.

SUBSTANCE: electrical element includes two or more current-conducting elements, through which current flows, and an insulator retaining the corresponding current-conducting elements in an insulated state. Resistive body (13) is created in a circumferential direction of at least one of current-conducting elements (11) on surface of insulator (12). Resistive body (13) distributes voltage applied to surface of insulator (12) between two adjacent current-conducting elements (11), and as a result, difference of potentials, which is distributed along the surface of insulator (12), becomes equal to voltage of the beginning of the charge or is lower than it.

EFFECT: improving reliability of electrical element insulation.

14 cl, 11 dwg

FIELD: electricity.

SUBSTANCE: invention relates to an insulator for a tight shell of a connector of end termination of an electric cable, which provides for electric connection between end termination of the cable (132, 134) and a domestic contact terminal. In accordance with the invention the insulator (100) comprises the first installation channel (102) to hold the domestic contact terminal (208) and the second assembly channel (104) to partially hold the cable (132, 134), besides, the second installation channel (104) has a contact area (112), in which in the mounted condition there is a cable tip located subject to electric contact impact, and a sealing area (114), which may become a support as capable of sealing of the end termination of the cable, and in which the central axis (118) of the sealing area (114) is located as shifted relative to the central axis (116) of the connection area (112).

EFFECT: higher tightness between a channel and a cable in a wide range of diameters of used cables.

18 cl, 23 dwg

FIELD: electricity.

SUBSTANCE: through connector (100) extends partially or completely through the hole in a wall (202) of underwater containers (200). The connector contains a conductive rod (102), with a conic part (104) with an external diameter increasing in a longitudinal direction (108), and also electrical insulator (136), with a conic part (138) with an internal surface (140), directed towards the conic part (104) of the rod, and with an external surface (142), opposing the internal surface (140), directed towards the conic part (104) of the rod. The outer diameter (144) of the surface (142) of the conic part (138) of the insulator is increased in a longitudinal direction (108), which passes from internal space (204) of the container towards external space (206).

EFFECT: improvement of leakproofness of connection and prevention of the connector destruction as a result of significant pressure drops between external and internal spaces of the container.

19 cl, 4 dwg

FIELD: electricity.

SUBSTANCE: invention is referred to the connector with closed conductive parts comprised of cable assembly and connecting device, wherein screen of insulation and metal earthing are insulated from a part of outer semiconductor layer of the connecting device, which forms part of a chamber with at least a part of the cable assembly in it. The connector is applied to cross connection.

EFFECT: charge and heat accumulation is prevented in metal screening layer of cables in result of earth current passing through metal screening layer and leading to degradation of the cable.

15 cl, 10 dwg

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