Extended element and its application

FIELD: electricity.

SUBSTANCE: extended element has outer sleeve-shaped rigid insulating cover (1) enveloping high voltage conductor passing in longitudinal direction of the cover, and gap (10) inside the cover at inner wall of the cover, which at least partially envelopes the above conductor and is filled with medium (11) of material with electrical insulation properties. The above medium is formed with electric insulating material containing the cavities which are at least partially filled with gas; at that, material is capable of being extended at increase of its temperature owing to reversible compression of the above cavities and reduction of their volume. Cavities are formed with deformed spheres capable of recovering their shape after deformation at reduction of external compression forces from insulating material. Microspheres are filled with liquid and gas mixture. The above material represents cross-linked gel. Through insulator for transformer or generator, end cable coupling sleeve and high voltage device is made in the form of the above extended element.

EFFECT: preventing electric breakdowns on equipment, housings or other earthed objects.

25 cl, 4 dwg

 

The technical field

The present invention relates to elongated element having external rocalobras hard insulating sheath surrounding the conductor of the high voltage flowing in the longitudinal direction of the shell, and the gap inside the shell at the inner wall of the shell at least partially surrounding the specified conductor and filled environment of a material with insulating properties.

The level of technology

The invention is directed to any element, in which a high voltage must be shielded from the environment to prevent electrical breakdown in the equipment, housing or other normally grounded objects.

An example item is pass the isolator connecting the transformer to the network of high voltage, in which it is important to shield the high voltage conductor that you want to connect to the transmission network, in a location and at a considerable distance from the transformer, comprising, for example, 4 meters.

Cable terminations and high-voltage devices are other examples of such elements.

An element of this type must be able to withstand large temperature changes over time. These temperature changes may be due to the fact that it is completely or at least partially outside the premises, g is f temperature, depending on the time of year, can vary from -40°C to +40°C. in Addition, the load of the specified conductor high voltage may vary, i.e. the current flowing through it, can vary so much that the temperature of the conductor, and thereby the temperature of the parts specified elongated element inside this shell can vary greatly Indeed, the temperature of the shell will be mainly determined by the temperature of the environment of the specified element, while the temperature of its internal parts, except from the environment will also depend on the magnitude of the current flowing through the conductor. Environment with defined material insulating properties, which is supposed to fill a specified period, will change in volume with increasing temperature, which means that if the environment is fully enclosed in said shell, inside the shell with increasing temperature will increase the pressure. This pressure can cause damage to the outer insulation sheath.

There are two known solutions to this problem. The first solution is to create an element with insulating outer shell that can withstand the increasing pressure that is difficult to do and expensive. The second solution is to run the item to take into account the increase Yes the population, for example, combining the specified gap filled with fluid medium, with expansion vessel that is both complex and expensive solution. In addition, this solution contains the risk of leakage of the specified environment that may pose a fire hazard.

Disclosure of inventions

The aim of the present invention is to provide an element defined in the introduction of the type offering a different solution temperature changes of the specified element and its parts.

In accordance with the invention this objective is achieved by creating such element, in which the specified environment is formed of insulating material containing cavity at least partially filled with gas, and wherein said material is able to expand with increasing temperature due to the reversible compression of these cavities and reduce their volume.

This means that instead of the occurrence of a high pressure when the temperature of the specified environment, the material will expand in the inner direction by compressing these cavities, so that the pressure can be reduced. Thus, the insulating sheath can be protected from destruction without exceeding its size, and is not required to provide any complicated and expensive construction for protection against pressure increase.

One is from the embodiments of the invention the said cavity is formed of a deformable spheres, able after deformation to recover its shape while reducing external forces of compression from the specified material due to temperature reduction. This provides an advantageous way of obtaining these cavities providing elastic properties of the specified environment when the temperature changes. It is even possible that these cavities will expand and increase the volume in relation to the state at room temperature, when the temperature falls below room temperature.

According to another variant of the invention, the specified material is poperechnyy gel with embedded microspheres Combination of such gel with microspheres allows the easy way to choose the ratio between the total volume of these cavities and the total amount of the specified period, meeting the requirements of the intended use of the specified element.

According to another variant of the invention, the said microspheres have a diameter in the range from 10 μm to 100 μm in the absence of deformation. It turned out that the dimensions of these cavities allow for the preservation of the excellent insulating properties of the specified environment.

According to another variant embodiment of the invention, these microspheres are expanded microspheres.

According to another variant of the invention, the criminal code is related microspheres filled with a mixture of liquid and gas, in which provided an increase in the gas part of the temperature increase of the specified material and, thereby, the temperature of the microspheres. By increasing the gas side with increasing temperature reduction of these microspheres with increasing temperature is facilitated.

According to another variant embodiment of the invention, these microspheres filled only with gas.

According to another variant of the invention, the total volume of these cavities at room temperature is 10%-15%, preferably 20%-40%, of the total volume of the specified environment and, accordingly, the specified period. This means that this material can be significantly increased with the reduction of the volume of these cavities without significant increase in pressure on the parts of the element, determining a specified period.

According to another variant of the invention, the specified amount filled in the specified environment with the provision of excessive pressure in the gap, i.e. the impact on the inner walls of the specified shell, where the pressure P is in the range of 0<P<2 bar at room temperature Such excess pressure at room temperature was sufficient to ensure that the entire amount will be completely filled with specified environment and at lower temperatures the specified element.

According to another variant embodiment of the invention the specified conductor is a conductive tube, which runs essentially through the shell.

According to another variant of the invention, the specified period separates the inner wall of the shell from the active core of the element containing the specified conductor. Therefore, the specified period must not occupy the entire volume between the conductor and the outer shell. In one of the embodiments of the invention the specified element is reduced insulator designed to input conductor high voltage through the wall, and the specified active core includes distributing the electric field of the capacitor surrounding the specified conductor so that the electric field was almost constant from the conductor to the outside in the direction of the insulating shell. "The wall" here should be understood in a broad sense, and the wall here can be not only the wall of the building, but the body such as the body of the transformer.

According to another variant of the invention, the specified shell is a ceramic sleeve is preferably provided with external flanges. This ceramic sleeve at the ends can be attached to the metal flanges, for example, from aluminum.

In another variant implementation of the image is the shadow element is designed with the possibility of finding a conductor energized network of at least 12 kV, such as 12 kV - 800 kV, in particular 50 kV - 800 kV. These ranges are possible voltage range of the conductor in the element that is the object of the present invention.

According to another variant embodiment of the invention the specified element is arranged to flow through the conductor of the specified element current of at least 1, such as 1 a - 100 kA, in particular 500 And 25 kA. Such currents are typical for applications where it is useful element of this type, and changes in these currents can cause significant temperature change in a specified environment in the interval.

According to another variant embodiment of the invention the element is a lock insulator for installation on the station convert high voltage to post of conductor of high voltage through the wall of the hall of the current controllers outside or from one such hall in another similar room. The element may also be a lock insulator, made with the possibility of connection with an external enclosure devices for high voltage, such as a passing insulator made with the possibility of connection with high-voltage disconnector, where it is necessary to isolate the conductor relative to the grounded surface through which he must pass.

Another VA who Ianto the invention, the element may be a passing isolator transformer (transformer input) or passing insulator generator, or he can be a lock insulator for passage through the wall.

According to another variant of the invention, the specified item is made with possibility of installation on the side of the bushing for the wiring conductor of the high voltage through the wall to drain voltage of this bushing. Temperature changes specified insulating medium such element could also be a serious problem associated with the resulting pressure, if this material had not been able to expand by reducing the volume of these cavities.

According to another variant of the invention, the specified element is designed as a cable terminal coupling with the possibility of connecting a high-voltage cable to one end of the element. Such terminators can be used to connect electrical cables, such as cables with insulation of cross-linked polyethylene (PEX-cable), to the power line network high voltage transformer or switchgear gas-insulated, where the specified element can be installed on the ground at the end of the cable.

The invention relates also to the use of the element according to the invention as a bushing to pass through the wall, passing isolate the RA transformer or bushing generator, or as a cable terminal coupling or as devices for high voltage.

Additional advantages and advantageous features of the invention will be seen from the following description of its embodiments.

Brief description of drawings

Below is a detailed description of the embodiments of the invention, given as examples, with reference to the accompanying drawings.

Figure 1 shows the entrance isolator transformer (transformer input) in the first embodiment of the invention with a partial cut in the longitudinal direction.

Figure 2 shows the enlarged view of part of the casing and internal parts of the bushing of figure 1, as well as two larger fragments illustrating the structure of the environment of the insulating material in the specified pass-through insulator at two different temperatures specified environment.

Figure 3 shows a partial section view illustrating the element according to the second variant of the invention, located on the lateral surface of the bushing for the wiring conductor of the high voltage through the wall to drain voltage of this bushing.

Figure 4 shows a partial section of the element according to the third variant embodiment of the invention in the form of a cable terminal coupling.

The implementation of the image is the shadow

Figure 1 shows an elongated element according to the variant embodiment of the invention in the form of a bushing of the transformer with external rocalobras hard ceramic or polymeric insulating jacket 1 with external flanges 2, and the shell may have a length of about 1 DM 10 m and fastened at the ends to the metal flanges 3, 4, which may be made of aluminum. Explorer 5 high voltage in the form of a tube, such as aluminum or copper tube, passes through the shell 1 to connect to the transformer on one end and to the conductor of the high voltage network high voltage at the other end (see pin 6). The conductor 5 is surrounded by distributing the electric field of the capacitor in the form of several layers 9, for example, in the form of alternating layers of paper and metal, wound each other Given number of layers and, accordingly, the number of capacitors is reduced at the end of 7, remote from the connection of the bushing to the housing 8 of the transformer, and at its end immersed in the oil reservoir 25 inside the housing of the transformer. This means that the electric field is almost constant, ranging from Explorer 5 outward in the direction of the shell 1. In addition, the conical shape of the capacitor layer 9 gives a smooth electric field in the axial direction inside PR is the output of the isolator. In the radial direction, the entire field will be concentrated in the bore of the insulator, where the capacitor layer 9 is thick, at that time, as part of the field will be concentrated in the bore of the insulator, and some in the air at the end of 7, remote from the ground potential, and the portion of the field will be concentrated in the capacitor layer, and a part in an oil bath at the other end.

In addition, inside the shell 1 is formed a gap 10 near the inner wall of the shell, and this gap is filled with the medium 11 from a material with insulating properties. This material contains expanded hollow microspheres filled with a gas or a mixture of liquid and gas, mixed with a silicone gel or other gel type. After such mixing silicone gel is the intermolecular cross-linking, resulting in the compressibility of the gel, the function of which will be explained below with reference to figure 2. The total volume of the cavities of the microspheres at room temperature is 10%-15% of the total volume of the specified environment and, accordingly, the specified interval.

Silicone gel contained in microspheres fill the gap with the formation of excess pressure, i.e. the impact on the internal wall 12 of the specified shell, with pressure P with magnitude in the interval 0<P<2 bar at room temperature. In the case of vertical ori is ncacii bushing of the transformer, as in figure 1, this means that the excess pressure will be less at the upper end 7 than at the lower end, due to the influence of gravity.

The environment function 11 in the specified period of 10 is as follows. The temperature of the environment may change as a result of changes in external temperature, if the shell is located outdoors, or as a result of changes in the strength of the current flowing through the conductor 5. Figure 2 shows what happens when the temperature of the specified environment increases, passing from a state of the environment And in state C. Accordingly, the gel 13 will expand, compressing the microspheres 14, and thereby reducing their volume, while the pressure inside the shell, at an acceptable level. Microspheres thus reversibly compressed, which means that they will expand and increase in volume when the temperature of the specified environment again will decrease.

Figure 3 shows the element 15 according to another variant embodiment of the invention, which is also present in figure 1. It is designed for installation on the side of the bushing for removal of voltage from this bushing Is achieved through wires 16, passing in the layer 9 and capacitor connected to the capacitor with a potential significantly different from the ground potential, which will be the potential of the external condense the ornago layer, adjacent to the metal flange; 17. Thus, lived 16 must be electrically insulated from the flange 17, and a period of 10 surrounding this core 16, is filled with medium 11 of the type indicated above. Thus, this environment 11 changes its temperature will behave as described above, protecting the body 18 of the insulator surrounding the conductor, from destruction due to pressure arising within the period of 10 filled with the specified environment.

Figure 4 shows the element according to the third variant embodiment of the invention in the form of a cable terminal coupling. Parts corresponding to the parts of the bushing in figure 1, are denoted by the same reference symbols. End cable clutch cable clamp 20 on one end that is connected to the cable 21 to the high voltage, such as cables with insulation of cross-linked polyethylene (PEX-cable). This clamp 20 is connected to the conductive tube 5 passing inside the ceramic shell 1 to its other end for connection to the air line 22 of the network of high voltage. The lower end of the cable terminal of the coupling, preferably, is attached to a grounded plate 23 by means of aluminum flange 24. The gap 10 between the conductor 5 and the casing 1 is filled environment 11 described above with reference to figure 1 and type 2, which leads to the same behavior and the same advantages which the substances as specified above.

The invention is naturally in no way limited to the above-described variants of implementation, and many possibilities for modifications of the invention will be apparent to a person skilled in this field without departing from the basic idea of the invention, formulated in the accompanying claims.

These cavities may have a shape other than spherical, and may be closed cells formed and limited by the material forming the remainder of the specified environment.

1. The elongated conductive element having external rocalobras hard insulating shell (1)surrounding the conductor (5, 16) high voltage passing in the longitudinal direction of the shell, and the gap (10) inside the shell at the inner wall of the shell at least partially surrounding the specified conductor and filled environment (11) of a material with insulating properties, with the specified environment is formed of insulating material (13)containing a cavity (14)at least partially filled with gas, is able to expand with increasing temperature due to the reversible compression of these cavities and reduce their volume, and these cavities are formed of a deformable spheres (14)capable of after deformation to recover its shape when reducing an external force is pressing on the part of the specified material (13) due to the reduced temperature, and the specified material is a cross-linked gel (13) with embedded microspheres (14)filled with a mixture of liquid and gas, which provided an increase in the gas part of the temperature increase of the specified material and thereby the temperature of the microspheres.

2. The element according to claim 1, characterized in that the microspheres (14) have a diameter in the range from 10 to 100 μm in the absence of strain.

3. The element according to claim 1 or 2, characterized in that the gel (13) is a silicone gel.

4. The element according to claim 1 or 2, characterized in that the microspheres (14) are extended microspheres.

5. The element according to claim 1, characterized in that the total volume of such microspheres (14) at room temperature 10-50%, preferably 20-40%, of the total volume of the specified environment (11) and, respectively, of the gap (10).

6. The element according to claim 1, characterized in that the gap-filled environment with the provision of excessive pressure in the gap, namely, ensuring the impact on the inner walls of the specified membrane at a pressure in the range from 0 bar to 2 bar at room temperature.

7. The element according to claim 1, characterized in that the conductor is a conductive tube (5), passing essentially through the shell (1).

8. The element according to claim 1, characterized in that the gap (10) separates the inner walls of the Obol is his (1) from the active core element, containing conductor (5).

9. The element according to claim 1, characterized in that the shell (1) is a ceramic or polymeric sleeve is preferably provided with external flanges (2).

10. The element according to claim 9, characterized in that the ceramic or polymeric sleeve at its ends attached to the metal flanges (3, 4).

11. The element according to claim 1, characterized in that it is made with the possibility of finding a conductor energized network of at least 12 kV, such as 12 - 800 kV, in particular 50 to 800 kV,

12. The element according to claim 1, characterized in that it is arranged to flow through a conductor current of at least 1A, such as 1A - 100 kA, in particular 500 - 25kA.

13. The element according to claim 1 or 8, characterized in that it is a passing insulator made with the possibility wiring conductor high voltage through the wall.

14. Item by item 13, characterized in that the active core contains the distribution of the electric field of the capacitor (9)surrounding the conductor (5).

15. Item by item 13, characterized in that it is a lock insulator for installation on the station convert high voltage to post of conductor of high voltage through the wall of the hall of the current controllers outside or from one such hall in another similar room.

16. Item by item 13, Otley is audica fact, what is a passing insulator made with the possibility of connection with an external enclosure devices for high voltage.

17. Item by item 16, characterized in that it is a passing insulator made with the possibility of connection with high-voltage disconnector.

18. Item by item 13, characterized in that it is a passing isolator transformer or a passing insulator generator.

19. Item by item 13, characterized in that it is a lock insulator for passage through the wall.

20. The element according to claim 1, characterized in that it is made with possibility of installation on the side of the bushing for the wiring conductor of the high voltage through the wall to drain voltage of this bushing.

21. The element according to claim 1, characterized in that run as a cable terminal coupling with the possibility of connecting a high-voltage cable to one end of the element.

22. Lock insulator for passage through the wall, characterized in that it is made in the form of an elongated conductive element, described in any one of claims 1 to 11.

23. Pass isolator transformer or generator, characterized in that it is made in the form of an elongated conductive element, described in any one of claims 1 to 11.

24. End cable IUF is a, characterized in that it is made in the form of an elongated conductive element, described in any one of claims 1 to 11.

25. The device is a high voltage, made in the form of an elongated conductive element, described in any one of claims 1 to 11.



 

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