Electric connector incorporating thermoplastic elastomer and its manufacturing process

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

 

This application is based on earlier filed simultaneously considered provisional application No. 60/380914, filed may 16, 2002, the subject of which is wholly incorporated into this application in its full scope by reference to it.

The technical field to which the invention relates.

The present invention relates to electrical devices, and, more specifically, to electrical connectors for electrical systems, and methods for their manufacture.

The level of technology

Electrical distribution system in typical applications include distribution lines or feeders that depart from the transformer substation. In typical cases, the substation transformer connected to the generator through the power lines.

Along the route of the feeder can accommodate one or more distribution transformers, additionally decreasing the voltage supplied commercial or domestic consumers. The voltage may be, for example, within the range 5-46 kV. In a distribution system are different connectors. In particular, the primary winding of the distribution transformer in typical cases, there is a transformer bushing, to which is connected the insert sleeve. In turn, the insert sleeve may Rethimno to connect kolenc the th connector. In addition, to the other end of a bent connector secures the distribution feeder. Of course, in a typical power distribution system may also be applied connectors of other types. For example, such connectors may be assigned other types of detachable connectors, as well as permanent splices and terminations. Large commercial consumers can also experience the need for such high-voltage connectors.

One of the specific difficulties that arise when using conventional crankshaft connector is, for example, in the application of curing materials. For example, such a connector can typically be fabricated by forming first inner semiconductor layer, and then the outer semiconductor sheath (or Vice versa). These two constituent element is placed in a press for final isolation, and then between the two semiconductor layers by injection get the insulation layer. Accordingly, the manufacturing time is relatively long, as during the manufacture of the need to ensure that the curing of the materials. In addition, conventional ethylenepropylene Monomeric materials used for the manufacture of such crankshaft connector and sleeve inserts to him, is to have other disadvantages.

One of the characteristics desirable in typical cases, cranked connectors, is to provide the ability to easily determine whether the current circuit, which includes the connector. Accordingly, such connectors requires the presence of the test points to check the voltage. For example, in U.S. patent No. 3390331, issued in the name of brown, and others, reveals the crank connector containing conductive electrode mounted in the insulator with a gap relative to the inner conductor. If the conductor is energized, the test point will be available voltage. In U.S. patent No. 3736505 on the name Sankey, No. 3576493 name Tachika etc., No. 4904932 in the name of Schweizer, Jr. and No. 4946393 name Borgstrom and others revealed a similar test point for crank connector. Such a test point for checking the voltage to some extent difficult to obtain in the manufacturing process, and in the case of contamination and when you use their testimony can become less accurate and reliable.

Crankshaft connector typically includes a housing connector with a passage inside it, with the bend. The semiconductor material for the inner layer in a bend of the passage is ethylenepropylene monomer. This first layer is enclosed in an insulating second layer of Etiler brendirovalo monomer, and a third semiconductor layer of the ethylene-propylene-diene monomer, or outer shell comprising a second insulating layer. The first end of the passage is extended and carries the electrode or probe, which is tightly inserted into the stub box. The second end of the passage is inserted electrical conductor. It is desirable to ensure reliable sealing of the second end of the connector relative to the end of an electrical conductor or feeder. Accordingly, another potential disadvantage of such a crank connector is the difficulty of integrating electrical conductor manually to the second end of the housing of the connector.

In an attempt to overcome the difficulty arising from the introduction of the electrical conductor to the second end of the connector, in U.S. patent No. 4629277, issued in the name of Butcher and others, reveals the crank connector containing the shrink tube, the end of which is inserted an electrical conductor. Accordingly, the end of the conductor can be easily inserted into a wide tube, then the tube is heated, resulting in its shrinkage, and she tightly embraces the conductor. U.S. patent No. 4758171, issued in the name of hay, refers to shrink the tube, put on the end of the cable before pushing the end of the cable into the crank case of the connector.

In U.S. patent No. 5230640, revealing the nom in the name of Tardif, disclosed crankshaft connector containing choledochotomy core installed at the end of the crank connector containing ethylenepropylene monomer that allows you to install the cable, and then to seal the housing of the connector, removing the core. However, such a connector may suffer marked deficiencies relating to the speed of its manufacturing and production costs. In U.S. patent No. 5486388 in the name of Portals, etc., No. 5492740 in the name of Vallauri etc., No. 5801332 in the name of Berger and others, as well as No. 5844170 on the name of the Choir and others disclosed in each of them, similar holodostojkie tube for tubular cable splice.

Another question that may arise in relation to the crankshaft of the connector relates to electrostatic discharge, which can cause damage to the first or the semiconductor layer. In General, the number of patents reveals how to choose the geometric parameters and / or properties of materials used for the manufacture of the electrical connector in order to reduce the electrostatic voltage is U.S. patent No. 3992567 on the name Malia, No. 4053702 in the name of Erickson and others, No. 4383131 on the name CLEBURNE, No. 4738318 on the name of Butcher etc., No. 4847450 on the name of the deceased Rupprecht, No. 5804630 and 6015629 in the name of Heyer etc., No. 6124549 in the name of Kemp and others, as well as No. 6340794 on the name Wandmacher and other

For a typical crankshaft what about the connector 200 And is provided, to crank the cuff or the outer front end found on the flange response bushing insert to ensure containment of the arc and (or) gas produced during the on and off load. Over the last few years in this industry has been identified cause, leading to the re-emergence of the breakdown at a voltage of 25 and 35 kV. In this industry it was found that at certain temperatures and operating modes of the chain there is a partial vacuum. As a result of the partial vacuum is reduced dielectric strength of air and there is a breakdown of the boundary surfaces at the moment of the knee sleeve insert. Different manufacturers have tried to solve the problem by providing ventilation area of a surface section of a bent cuff, and at least one manufacturer has provided insulation all conductive elements inside surfaces of the partition.

For example, in U.S. patent No. 6213799 and continuing application No. 2002/00055290 A1 authors Azovskogo and other disclosed protivopolojnoe ring, worn on the sleeve insert, designed for removable crank connector. On the ring there are a number of passages, preventing the occurrence of a partial vacuum while removing the crankshaft connection, under the influence of which would otherwise case is e to occur a break. In U.S. patent No. 5957712 in the name of the Nomad, and No. 6168447 in the name of Stepnyak etc. are also disclosed in each of them, the modification stub inserts incorporating passages, reducing the likelihood of breakdown. Another approach to solving problems prevent breakdown is disclosed in U.S. patent No. 5846093, issued in the name of Munch, Jr. and others, and is the use of rigid elements in the crank connector, which does not allow him to stretch when removing the sleeve insert, and there was a partial vacuum. In U.S. patent No. 5857862, issued in the name of Munch, Jr. and others, reveals the crank connector having an insert containing the additional volume of air that is designed to prevent a partial vacuum, which is the cause of the breakdown.

Another potential disadvantage of conventional crankshaft connector is, for example, the need to provide the ability to visually determine the correct landing connector on the stub box. In U.S. patent No. 6213799, issued in the name Azovskogo and others, as well as in the continuing application No. 2002/00055290 A1, mentioned here above, is disclosed in each of patent documents that protivopolojnoe ring, worn on the stub insert colour and provides a visual indicator showing the case when it ZAT is neetsa, that cranked the connector is seated correctly.

In U.S. patent No. 5641306, issued in the name of Stepnyak, reveals a disconnect under load cranked connector having a series of colored bands, which are obscured in the introduction of the connector in mating, indicating that it was installed correctly. A similar solution, but exercisable in relation to an electrical bushing insert, proposed in U.S. patent No. 5795180, issued in the name of Sebenza, where disclosed disconnect under load connector and the response of the electrical bushing insert, the sleeve has a colored stripe, which is obscured when the crank connector is inserted in the return sleeve covering the removable connector.

Accordingly, conventional electrical connectors, intended in particular for use in high voltage distribution systems have several important shortcomings.

Disclosure of inventions

Given the above assumptions the aim of the present invention is, therefore, the creation of an electrical connector which is intended to be used, in particular, in high-voltage distribution systems and which can be easily made.

Mentioned and other objectives are achieved by providing the relevant features and advantages according to astasia the invention, using an electric connector, comprising a housing connector having a through passage and containing a first layer adjacent to the passage, the second layer comprising a first layer and made of an insulating thermoplastic elastomer material (TPE material), and a third layer comprising a second layer. The third layer preferably has a relatively low electrical resistivity and can also be made of a semiconductive TPE material. In some embodiments of the invention, the first layer may also be made of a semiconductive TPE material. Layers of the REQUIRED material can napressovyvaniya one on top of another, which increases the speed and efficiency of production, resulting in reduced manufacturing costs. In addition, the THIRD material may have excellent electrical characteristics, and also have other advantages.

The passage may have first and second ends and a middle portion located between them. The first layer can be placed along the middle part of the passage to defend inward from the respective ends of the passage. To connect the crankshaft and T-shaped connectors, the middle part of the passage may have an internal bending. In addition, the front end of the passage may have an increased diameter, the R under the electrical bushing insert, used in some embodiments of the invention.

In other embodiments of the invention, for example, such as an electric coupling box or some aggregates, the body of the connector may have a tubular shape that defines a passage. As applied to an electrical bushing insert, the second layer can have an increased diameter adjacent to the middle part of the passageway.

In other embodiments of the invention the housing of the connector in the zones adjacent to one end of a pass - first or second, you may have a progressively increasing outer diameter. And in still other embodiments of the invention the housing of the connector in the zones adjacent to one end of a pass - first or second, it may in the alternative to have a progressively decreasing outer diameter.

The first layer in order to reduce the electrostatic voltage can have at least one pre-defined properties. For example, such pre-defined property can be a preset profile of the impedance. In the alternative, or in addition, such pre-defined property can be a pre-defined geometrical configuration, for example, such as a configuration with one or nekolikanasobne, adjacent to the bending of the connector in those embodiments of the invention, which requires the presence of the bend.

The first layer may define an extreme inner layer and the third layer may define an extreme outer layer. The connector may also include at least one snatch the eye, which bears the body of the connector. The body of the connector may be designed to operate under tension of at least 15 kV and at a current of 200 A. the First and third layers may have, each, an electrical resistivity less than about 108Ω·cm, and the second layer may have an electrical resistivity of more than about 108Ω·see

The method according to the present invention, intended for the manufacture of the housing of the electrical connector having a through passage. The method may include applying the first layer defining a at least the middle part of the passage; napressovyvanie on top of him the second layer comprising a first layer made of insulating TRE of material having relatively high electrical resistivity; and napressovyvanie on top of him, the third layer comprising a second layer and made of a material having a relatively low electric at the considerable resistance. The third layer may also be made of a semiconductive TPE material and the first layer can be made of semiconductor TRE-material in some embodiments of the invention.

Brief description of drawings

Figure 1 is the perspective view of a bent connector made in accordance with the present invention.

Figure 2 is a longitudinal section of a bent connector, shown in figure 1.

Figure 3 is a side view of a bent connector with a test point to check the voltage on the separating screen and performed in accordance with the present invention.

4 is a partial section in side view of a bent connector having choledochotomy core and made in accordance with the present invention.

5 is shown in the perspective views of variants of the first layer crank connector according to the present invention.

6 is shown in the perspective view of another variant of the first layer crank connector according to the present invention.

Fig.7 is presented schematically in vertical section view of the first end portion of a bent connector is mounted on the electrical response of the stub box and made in accordance with the present invention.

Fig is presented schematically in wörth is the unique sectional view of the first end portion of another variant of a bent connector before putting it on the response of the electrical bushing insert, made in accordance with the present invention.

Fig.9 is presented schematically in a vertical sectional view of a bent connector shown in Fig after putting on his response to an electric coupling box.

Figure 10 is represented schematically a top view of part of a bent connector shown in Fig.9.

11 is a longitudinal section of a variant of the electrical bushing insert in accordance with the present invention.

Fig is a longitudinal section of another variant of execution of the stub insert in accordance with the present invention.

Fig is a longitudinal section of an electrical splice made in accordance with the present invention.

The implementation of the invention

The present invention is described below in more detail with reference to the accompanying drawings showing preferred embodiments of the present invention. However, this invention can be implemented in many different forms, and therefore should not assume that it is limited to only the illustrated and discussed here variants of its implementation. Rather, these embodiments of the invention are presented in order to more detail and fully disclose the present invention and to fully identify the scope of invention for which ecialists in this area. The same elements throughout the description of the invention indicated by the same number of items. For various embodiments of the present invention, the same elements are denoted by the same numbers, but with one or two strokes.

As shown primarily in figures 1 and 2, the subject of the present description is primarily cranked electric connector 20. Specialists in the art should be understood that the crank connector 20 is only one example of an electrical connector, such as used in the distribution of high voltage electricity, which contains the body of the connector having a through passage 22. As illustrated, the passage 22 has a first end 22A, the second end 22b and the middle part 22s, inside which there is a bend. For greater clarity, the housing 21 of the connector 20 shown without conductive metal parts, including no electrode or probe, which is placed within the enlarged first end 22A of the passage 22, which should be obvious to experts in the given field of technology.

The connector housing 21 contains a first layer 25 adjacent to the passage 22, the second layer 26, comprising a first layer and the third layer 27 comprising a second layer. In accordance with one important feature of the performance of the connector 20, at least the second layer may be made of insulating thermoplastic elastomer (TPE) material. The first and third layers 25, 27 preferably have relatively low electrical resistivity. In some embodiments of the invention the third layer 27 may be made of a semiconductive TPE material. In addition, the first layer 25 may also be made of a semiconductive TPE material. In other embodiments of the invention, the first layer 25 may be made of another material, for example, such as basic ethylenepropylene monomer.

When using a relatively new TRE-materials electric range, for example, such as olefinic thermoplastic materials, thermoplastic polyolefin materials, thermoplastic volcanic rocks and (or) a thermoplastic silicone materials, etc, you can use the new technology of pressing the layers. This technology may provide the first pressing of the first or inner semiconductor layer 25, followed by napressovyvanie on it the second or the insulating layer 26, and then napressovyvanie third or outer semiconductor shielding layer 27 over the insulation layer. Let's call some suppliers of such materials is the .Schulman - Akron, HE; AlphaGary Corp. - Leominster, VF; Equistar Chemicals, Houston, TX; M.A. Industries, Inc. - Peachtree City, GA; Montrell North America - Wilmington, DE; Network Polymers, Inc. Akron, OH; Solitia, Inc. - St. Louis, MO; Solvay Engineering Polymers - Auburn Hills, MI; Teknor Aprex International - clear Pawtucket, RI; Vi-Chem Corp.- Grand Rapids, MI; and Dow Chemicals - Somerset, NJ. In other words, the layers of the REQUIRED materials can napressovyvaniya one another, which increases the production speed and efficiency, resulting in reduced manufacturing costs. In addition, the TRE materials ensure obtaining excellent electrical characteristics.

The application REQUIRES materials to obtain the third layer 27 allows color coding of the entire outer part of the connector 20, for example, through the introduction of coloring matter in TRE-material that should be obvious to experts in the given field of technology. For example, in the proposed industrial standard set red color for connectors, for a voltage of 15 kV and blue connectors, for a voltage of 25 kV. Another color that can be painted TRE-materials, is grey. Of course, can also be used and various other colors.

In the illustrated embodiment, connector 20, the first end 21A of the connector adjacent to the first end 22A of the passage 22 has a progressively increasing outer diameter. The second end 21b of the connector adjacent to the WTO is th end 22b of the passage 22, has a progressively decreasing outer diameter. Specialists in the art should be obvious that there are also other configurations of the ends 21A, 21b of the connector.

As illustrated, the first layer 25 defines an extreme inner layer and the third layer 27 defines an extreme outer layer. The connector 20, as shown in the illustrations, also contains snatch lug 28, which carries the housing 21 of the connector. Snatch lug 28 may be of conventional design and need not here in any further discussion.

The body of the connector 21 can be designed to operate under tension of at least 15 kV and at a current of 200 A, although experts in the art should be obvious that there are also other values of operating parameters. In addition, the first and third layers 25, 27 can have, each, an electrical resistivity less than about 108Ω·cm, and the second layer may have an electrical resistivity of more than about 108Ω·see, Respectively, the term "semiconductor"used in this context, can also mean a and such materials, electrical resistivity which is so low that they could also be considered and guides.

Specialists in this the field of technology should be clear, although illustrated here above description discusses the crank connector 20, the same characteristics and advantages can be achieved also for the T-shaped connectors, which are included in the class of removable connectors with inner bend. This concept technology overlay layers to each other can be applied also when pressing products included in the standard series of isolated split connectors, splices and end couplings, which can for example be applied in the market of technical means of underground distribution of electricity. Some of these other types of electrical connectors are described below in greater detail here.

Further herein below with additional reference to figure 3 is considered another distinguishing feature cranked electric connector 20'. Used in the present method of providing voltage feedback cranked the connector assumes that provides for the presence of the connector of the respective sampling points, as stated herein above the description of the creation of the invention. The description also mentioned that this might be not reliable with pollution or exposure to moisture and voltage can then easily reach the state of saturation. With edigital 20', performed, as shown in the illustration, according to the present invention has a separating screen 27'. In other words, the third layer 27' is divided into three spaced with a gap relative to each other part, and the first and third parts 27A, 27C are connected to the source of reference voltage, and the second part 27b is in the buffer mode under the control voltage for the electrical connector 20'. In the illustrated embodiment of the invention the second part 27b of the third layer 27' is in the form of strips, which are located around the passage 22'. All these other elements of the connector 20', marked with a bar similar to the same elements discussed herein above description with reference to figures 1 and 2.

The control point 30, illustrated, is connected with the second part 27b of the third layer 27'. In addition, provision may be made for the presence of the cover 31, which provides the electrical connection of the first and third parts 27A and 27C of the third layer 27' between them, but still have access to the control point 30, which should be clear to experts in the given field of technology. For example, such a cover may be a hinged cover, not shown, which provides access to the control point 30, although it is not excluded also other configurations such cover.

The division is whether the separation of the adjacent parts of the third layer 27' or the outer conductive screen between them allows to obtain a reliable source of voltage, which can be used for control problems with equipment, detection energized or de-energized circuits and (or) used to control resulting in equipment failures, etc. that must be understood by the experts in this field of technology. Separating and isolating appropriately screen, providing the various parameters along its length and size, it is possible to obtain different values of the voltage feedback control equipment. The application REQUIRES materials facilitates the task of providing an indicator relating to the separating screen, and this characteristic can be provided for many types of electrical connectors, in addition to illustrated here cranked connector 20'.

Further herein below with additional reference to figure 4 is considered another distinguishing feature cranked electric connector 20"providing related advantages. As shown in this drawing, requires the presence of holodnokatanogo core 34 that is located within the second end 22b" of the passage 22". Of course, in other embodiments, implementation of the present invention choledochotomy core 34 can be located within at least part of p is koda 22". Choledochotomy core 34, as shown in the illustration, contains the carrier 36 and the release element 35 connected therewith so that the carrier holds the adjacent part of the connector in an extended state so as to ensure the ability to plug in an electrical conductor, not shown. Then is actuated release element 35, for example, by pulling it outward to remove choledochotomy core 34, resulting in the closure of the second end 21b on the electrical conductor.

The application REQUIRES materials facilitates the implementation of the technology cold shrink in relation to the detachable crank connectors 20, for example, for products of this type, designed for a current of 200 and 600 A. As cranked connectors 20 in typical cases, put on the return stub inserts, designed for a current of 200 and 600 And the stub side or the first end 21A" do not require any changes, and therefore the stub side can be aged for certain values of hardness on a Durometer and modulus. But with the cable side or from the second end 21b" housing 21" crank connector 20" application TRE-materials will provide the opportunity to use the technology cold shrink in order to initially expand the WMO is a great hole for the cable.

Next, in the here following description with reference again to figures 1 and 2, and with additional reference to figure 5 and 6 is another distinctive feature of the proposed connectors related to electrostatic voltage, which can occur in the ground layer 25. Specialists in the art should understand, the first layer 25 in order to reduce the electrostatic voltage can have at least one pre-defined properties. For example, such pre-defined property can be a preset profile of the impedance. This pre-defined profile of the impedance can be ensured in the process of pressing the first layer 25, and this process is facilitated by the use of TRE-material input in him additives or additives, for example, such as zinc oxide, which allow, respectively, selecting a profile full of resistance, to achieve the necessary reduction of the electrostatic voltage. In the alternative, or in addition, such pre-defined property can be a pre-defined geometrical configuration that also must be understood by the experts in this field of technology.

In order to solve the problem with electrostatic voltage in these versions of the connectors, having at least one bend, the first layer 40 may pressoffice or formed in some other way, to take the form that has the appearance characteristic of a variant of implementation of the present invention, is shown in figure 5. In particular, the first layer 40, as shown in the illustration, has first and second ends 41, 42 with a bend in its middle part 43. In order to reduce the electrostatic voltage on the curve requires the presence of the placed with a gap relative to each other of the ribs 44, passing between adjacent parts of the connector in the forward or inner corner of the bend. Of course, the first layer 40 can be performed by pressing the semiconductor TRE-material, as stated herein above the description, but in other embodiments, implementation of the present invention that the first layer 40 may be made from other materials having desirable mechanical and electrical properties.

The second variant of the first layer 40' is illustrated with specific reference to Fig.6. In this embodiment of the present invention, the first layer 40' has and second ends 41', 42' some other form. In addition, the rectangular part of the curve requires the presence of only one edge 44', designed to reduce emerging in this place elek is astaticescape voltage. The configuration of the ribs 44 or only edges 44'and the configuration of other parts of the body of the connector will depend on the required values of voltage and current that must be understood by the experts in this field of technology.

Of course, these techniques regulation electrostatic voltage can be used for any of a variety of embodiments of electrical connector discussed herein. For example, a typical crankshaft connectors, designed for a current of 200 and 600 And may get some advantage in the case of application of such techniques regulation electrostatic voltage in their manufacture, that should be clear to experts in the given field of technology.

Further herein below with additional reference to Fig.7-10 is considered protivopolojnii sign provided for the crankshaft connector 50. Conventional crankshaft connector exposed to potential breakdown occurring at the moment when the connector is removed from the stub inserts, and thus there is a partial vacuum as the corresponding end or cuff connector slips over the flange sleeve insert. Before this technology was made not dmocratie attempts to apply various methods to eliminate this drawback, associated with the breakdown as a result of the partial vacuum.

In relation illustrated here, the connectors 50, 50' this disadvantage is eliminated due to the fact that the housing 51, 51' of the connector is of such outer end portion 51A, 51A', adjacent to the first end 52a, 52a' of the passage 52, 52', which is designed in such a way that it takes the form of a bell, when set against the flange 55, 55' electric coupling inserts 54, 54'. In other words, the outer end 53, 53' may rest against the shoulder 55, 55' without any sliding contact between them, which would, otherwise, to the emergence of a partial vacuum.

In the embodiment of the present invention, illustrated in figure 7, the outer end 53 of the housing 51 of the connector can be from the very beginning thus formed to have the shape of a bell, even when he is not in contact with the shoulder 55 stub rates 54, that is, he is given this form at the time of manufacture. Of course, in other embodiments, implementation of the present invention the outer end 53 may be of such dimensions that it continues to remain at a distance from the flange 55, even when it has already sits in its place and is locked in a corresponding recess provided in the passage 22, which must be understood by the experts in this about the Asti equipment.

In the embodiment of the present invention, shown in Fig-10, the outer end 53' has a small curvature (Fig), through which the outer end of the divergent flare out as soon as you rest against the shoulder 55' (Fig.9 and 10). Of course, specialists in the art will be obvious, and other configurations are proposed in accordance with the present invention.

In addition, as also shown for the version of the connector 50', presented at Fig-10 may include a number of passes in the longitudinal direction of the slits 56 which facilitate the formation of diverging outward flare and (or) provide, to some extent, the passage of air while removing the connector 50' with the stub insert 54'. Accordingly, the probability of breakdown at this greatly reduced or completely eliminated. Moreover, in such embodiments, the implementation of the present invention when applied TRE-material outer end may be formed to have a relatively small thickness, thereby facilitating the formation, as indicated here above, radiating outward flare that will be obvious to experts in the given field of technology.

Next explained is another characteristic, providing appropriate benefits for the proposed electric is a mini connector 50'. As stated herein above the description of the creation of the invention, in many cases it would be desirable to provide a visual indication allowing to determine the correctness and completeness of the landing connector on the electrical socket insert 54'. In illustrated here, the embodiment of the connector 50' requires the presence of the color bar 57, which serves as a pointer, enabling the technician to visually determine that the connector is moved from the position in which it is not planted in its place (Fig), to a full landing him on the spot (figures 9 and 10). In other words, as soon as the color strip 57 becomes fully visible to a technician looking at the connector 50' along the axis of the stub insert 54' toward the first end 51' of the connector (figure 10), the connector is seated fully in its place. In contrast, in some embodiments, implementation of the present invention the outer end 53' may be designed so that when it is viewed from the side, the colored strip 57 will not be seen, when the connector is properly seated in its place. Specialists in the art it should be clear that there are also other configurations of indicators provided on the outer end of the connector 50', which are assumed to be in accordance with the present invention.

A sign incorporating the indicator may be provided in relation, for example, all cranked connectors, including devices of this type, designed for a voltage of 15, 25, 35 kV and a current of 200 a, as well As many of the devices of this type, designed for a current of 600 A. Indicators of the correctness of landing and provides for some known connectors, but these are usually indicators of the correctness of landing are located on the stub box. Accordingly, it is difficult to see such an indicator, when the technician puts the crank connector on the location, being right in front of the transformer. The currently used indicators of the correctness of landing are in typical cases, the yellow stripe on the sleeve and closes the cuff of a bent connector when the two parts are fully connected with each other. After connection of these products between the operator can, by looking at coupled with each other products on the side, to determine covered if all yellow stripe completely. In accordance with this characteristic, providing for the presence of the indicator on the connector 50', the cuff of a bent connector or the outer end 53 will be messes up or to form a socket at full convergence of the parts of the connector to each other, and it can in order to put technical specialist, being right at the front of the connector. Thus, the technician will not need to be closer to energized equipment to see whether the connector clicks into place.

Further herein below with additional references on 11-13 discusses other types of connectors that provides for the presence of stated in this description of the characteristics that provide related advantages. Figure 11 shows the electrical coupling insert 60, which includes a housing 61 of the connector having a tubular shape and defines a passage 62 with opposite ends a, 62b and the middle part is located between them. The housing 61 of the connector, as shown in the illustration, contains the first layer 65 made of metal, the second layer 66 made of insulating material and comprising a first layer and a third layer made, for example, from a semiconductor material and comprising a second layer in the Central part of the body of the connector which is attached to the middle part of the passage. In the above, the illustration embodiment, the present invention provides for the presence of other metal inserts 68, inside passage 62, while the experts in this field of technology can in order to recognize, that can also be used in the manufacture of conductive inner parts of the stub insert any other materials and the execution of these parts so that they had some other form.

The second and third layers 66, 67 can be made from three materials with the receipt with the relevant advantages noted herein above the description. For example, the second layer 66 may be made of insulating TRE-material, and the third layer may be made of a semiconductive TPE material. In addition, as also shown in this illustration of a variant of implementation of the present invention, the second layer 66 may have a section with a larger diameter adjacent to the middle part C passage 62. Of course, such a section with a larger diameter, located in the middle part may be formed by multiple overlay insulation TPE-material successive layers, as indicated by the dotted lines 70', or using for the same purpose, for example, any other filling materials that must be understood by the experts in this field of technology. Often desirable may be the formation of successive relatively thin layers of insulation TPE material, thus obtaining the desired about is her thickness and shape of the second layer 66. The first and third layers 65, 67 in this embodiment, connector and other parts discussed herein above described, can also be formed in the form of sequentially superimposed on each other more thin layers of material that must be understood by the experts in this field of technology.

The second version of the stub insert 60' shown in Fig and will be hereinafter described in more detail here below the description. In this embodiment of the present invention, the first layer 65' is of plastic material, for example, from the THIRD material. Such plastic material may, for example, be an insulating or semiconductor material. All other elements of this coupling insert 60', marked with the numbers of items with barcode, similar to the corresponding elements with the same number of items, but without stroke, discussed herein above description, with links to 11.

Sign discussed herein above described and related to the presence of ribs, reducing the electrostatic voltage can also be provided for the proposed variants of the stub inserts 60, 60'. In addition, can also be provided and the possibility of using a set of stub inserts 60, 6', which are connected, for example, to a common electrical bus, forming the electrical connector of this type, which in typical cases is called branching, that should be clear to experts in the given field of technology.

Next, in the here following description with reference, in particular, on Fig is illustrated another variation of the electrical connector made in the form of a linear cluster of 80. On this illustration, the joint 80 has a tubular body 81 of the connector defines a passage 81 having first and second ends a, 82b to the middle part 83 C get located between them. The housing 81 of the connector has a first layer adjacent to the middle part C passage 82 and (or) defines this part, the second layer 86 comprising a first layer and a third layer 87, comprising a second layer. The first and (or) third layers 65, 67 can be made of a semiconductive TPE material, and the second layer may be made of insulating TRE-material. Accordingly, the splice 80 also has all the benefits provided, as stated herein above the description, the application of the TRE materials.

There are many different changes that can be made in the present invention by a person skilled in the technical field, as well as other vari is now implementation of this invention, which can be offered by such an expert on the basis of the principles of the present invention described herein above description and illustrated in the attached drawings. Accordingly, it should be understood that the present invention is not solely limited to only the disclosed and illustrated in this description of the variants of its implementation and that the possibility of development of other modifications and embodiments of the present invention, which are within the essence and scope of the invention defined in the attached claims.

1. Electrical connector comprising a housing having a through passage and is made of the first layer adjacent to the passage, the second layer covering the first layer and made of an insulating thermoplastic elastomer (TPE) material with a relatively high electrical resistivity greater than 108Ohm·cm, and a third layer covering the second layer and made of a THIRD material with a relatively low electrical resistivity lower than 108Ohm·see

2. The connector according to claim 1, characterized in that the first and third layers each made of a semiconductive TPE material.

3. The connector according to claim 1, characterized in that the passage had the t first and second ends, and the middle part located between them, while the first layer is located along the middle part of the passage and is separated inward from the ends of the passage.

4. The connector according to claim 3, characterized in that the middle part of the passage has a bend, and the front end of the passage has an enlarged diameter under electrical bushing insert, introduced inside of it.

5. The connector according to claim 3, characterized in that the housing of the connector has a tubular shape that defines the passage.

6. The connector according to claim 5, characterized in that the second layer has an increased diameter in the area of the middle part of the passage.

7. The connector according to claim 1, characterized in that the first layer in order to reduce arising thereon an electrostatic voltage has at least one pre-specified properties.

8. The connector according to claim 7, characterized in that the said first layer is located inside of the bend, as specified preset property is ensured by performing at least one edge adjacent to the bending and extending from it toward the outside.

9. The connector according to claim 1, characterized in that the first layer defines an extreme inner layer and the third layer defines an extreme outer layer.

10. The connector according to claim 1, characterized in that the third layer section is indicated in three spaced with a gap relative to each other part, the first and third parts are connected to a source of reference voltage, and the second part is in the buffer mode under the control voltage for the electrical connector.

11. The connector of claim 10, characterized in that it further comprises a control point, the protruding toward the outside relative to the second part of the third layer, and a cover located over the second portion of the third layer and providing access to the control point.

12. The connector of claim 10, characterized in that the second part of the third layer has the form of a strip.

13. The connector according to claim 1, characterized in that inside at least part of the passage has choledochotomy core.

14. The connector according to item 13, characterized in that choledochotomy core contains media and release element connected to the carrier so that the carrier holds the adjacent part of the housing of the connector in an extended state until, until it is powered liberating element.

15. Electrical connector according to claim 1, characterized in that the portion of the outer end of the connector housing adjacent to the first end of the passage, has the shape of a bell.

16. The connector 15, characterized in that the said part of the outer end of the housing of the connector takes the form of the of astrub, as soon as you rest against the flange of the electrical bushing insert.

17. The connector according to item 16, characterized in that the said part of the outer end of the housing of the connector there are further indicators.

18. A method of manufacturing a housing of an electrical connector having a through passage, provides for the formation of the first layer representing at least the middle part of the passage, napressovyvanie on top of him the second layer, made of an insulating thermoplastic elastomer (TPE) material with an electrical resistivity of more than 108Ohm·see, as well as napressovyvanie on top of the second layer, the third layer being made of a THIRD material with a specific electrical resistance of less than 108Ohm·see

19. The method according to p, characterized in that the first and third layers each made of a semiconductive TPE material.

20. The method according to p, characterized in that the formation of the first layer is carried out by pressing it from semiconductor TRE-material.

21. The method according to p, characterized in that napressovyvanie second layer on the first and third layer on the second provides napressovyvanie the second and third layers so that the first layer was located along the middle part of the passage and defended inward from the ends of the passage.

22. With the ESP on item 21, characterized in that the middle part of the passage is located inside the bend.

23. The method according to item 21, characterized in that the formation of the first layer, napressovyvanie second layer on the first and third layer to the second allows you to get the body of the connector is tubular in shape, defining a passage.

Priority items:

16.05.2002 - claims 1 to 7, 9 to 15, 18-23;

15.05.2003 - PP, 16-17.



 

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