Explosion-proof voltage transformer for high-speed train contact power grid

Abstract

The utility model discloses an explosion-proof voltage transformer for a contact power grid of a high-speed train, which comprises a main insulator, a voltage transformer and a voltage transformer, the upper part of the spring-shaped primary lead is connected with the primary insert of the primary high-voltage terminal, and the lower part of the spring-shaped primary lead is connected to the high-voltage end of the coil device; the shielding net is positioned between the spring-shaped primary lead and the cavity; the explosion-proof device comprises an explosion-proof end cover and a plurality of heat release mechanisms, and the explosion-proof end cover is installed at the top of the main insulator; each heat release mechanism comprises a spring, a fixing bolt and a protective cover, the spring sleeves the upper part of the fixing bolt, the lower part of the fixing bolt penetrates through the explosion-proof end cover and extends into the main insulator, and the protective cover covers the upper part of the fixing bolt and the spring and then is in threaded connection with the corresponding groove of the explosion-proof end cover. The explosion-proof device is arranged at the top of the main insulator, the installation space is saved, hot airflow is instantly released and is not released after being gathered to certain pressure for a long time, and the problem that the mutual inductor is burnt and cracked can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage measurement or relay protection equipment for a high-speed train contact network control system, in particular to an explosion-proof voltage transformer for a high-speed train contact network. Background Art

[0002] Voltage transformers are devices for measuring voltage, real-time monitoring or relay protection in the power supply control system of high-speed trains. According to design requirements, voltage transformers, main circuit breakers, disconnectors, lightning arresters and other high-voltage components are installed on the roof of the car. At present, the domestic high-speed train contact network lines are arranged in phases. When the high-speed train lifting pantograph passes through the phase separation, an instantaneous overvoltage is inevitable, which is a great test for the high-voltage voltage transformer. Long-term accumulation can easily cause insulation damage, and the heat accumulation of the product's primary coil to a certain extent causes it to burst, affecting the main circuit breaker, disconnector, lightning arrester and other high-voltage components. Damage, even endangering the safety of personnel. For this reason, according to the requirements of the locomotive operating environment, it is particularly necessary to develop a stable and reliable high-speed train contact network explosion-proof voltage transformer that is suitable for use when high-speed trains pass through phase separation according to the domestic application environment. Utility Model Content

[0003] Aiming at the problem that the insulation of the high-voltage voltage transformer is damaged due to overvoltage shock when the existing high-speed train is over-phased, a voltage transformer for explosion-proof contact power grid of high-speed train is provided, which has reasonable structure, good insulation, protection against overvoltage shock and stable performance, and further improves the safety and reliability of high-speed train operation.

[0004] To achieve the above purpose, the technical solution of the present application is: a voltage transformer for explosion-proof contact power grid of high-speed train, comprising:

[0005] A main insulator having a cavity opened in the upper portion;

[0006] A spring-shaped primary lead is located at the periphery of the cavity, the upper part of which is connected to the primary insert of the primary high-voltage terminal, and the lower part is connected to the high-voltage end of the coil body;

[0007] a shielding mesh, located between the spring-shaped primary lead and the cavity;

[0008] The explosion-proof device comprises an explosion-proof end cover and a plurality of heat release mechanisms, wherein the explosion-proof end cover is mounted on the top of a main insulator; each heat release mechanism comprises a spring, a fixing bolt and a protective cover, wherein the spring is sleeved on the upper portion of the fixing bolt, and the lower portion of the fixing bolt passes through the explosion-proof end cover and extends into the main insulator, and the protective cover covers the upper portion of the fixing bolt and the spring and is threadedly connected to a groove corresponding to the explosion-proof end cover.

[0009] Furthermore, the main insulator is formed by vacuum casting and curing the secondary winding, the primary winding, the iron core, the spring-shaped primary lead, the primary insert, and the shielding net with epoxy resin into an integrated structure, which is located on the bottom plate.

[0010] Furthermore, when the heat generated by the primary winding accumulates to a certain extent, it flows through the cavity in the direction of heat release. At this time, the spring on the fixing bolt is compressed to lift the explosion-proof cover plate out of the gap, releasing the heat instantly.

[0011] Furthermore, a grounding terminal is provided on one side of the bottom plate, and a secondary junction box is provided on the other side, and the secondary junction box is connected to the secondary junction terminal at the bottom of the main insulator.

[0012] Furthermore, a miniature circuit breaker with a fuse and a guide rail are provided in the secondary junction box, the miniature circuit breakers are arranged in parallel via the guide rail, and the guide rail is fastened to the bottom plate.

[0013] Furthermore, the main insulator is externally enclosed by an integrated outer silicone rubber sleeve, the lower part of the outer silicone rubber sleeve has silicone rubber sheds arranged in parallel with equal intervals, and the upper part has high-voltage end sheds arranged in parallel with equal intervals.

[0014] Furthermore, a wiring groove is formed between the bottom of the main insulator and the outer silicone rubber sleeve, the secondary wiring terminal is placed in the wiring groove and connected to one end of the connecting wire, the other end of the connecting wire passes through the outer silicone rubber sleeve and is connected to the secondary wiring box, and a rubber plug is provided between the outer silicone rubber sleeve and the connecting wire.

[0015] Furthermore, the upper part of the main insulator is a cylindrical structure, and a primary high-voltage terminal is arranged on the top of the cylindrical structure; the middle part of the main insulator is a truncated cone transition structure; the lower part of the main insulator is also a cylindrical structure, and the coil body is accommodated in the cylindrical structure; the inner cavity shape of the outer silicone rubber sleeve matches the outer shape of the main insulator.

[0016] As a further feature, the cavity, the shielding mesh and the spring-shaped primary lead are concentrically arranged.

[0017] As a further step, the secondary winding and the primary winding are concentrically wound on an insulating frame, and the primary winding is wound in two stages, with an external electrostatic screen for each stage. The electrostatic screen is made of a capacitor composite paper wrapped with semi-conductive paper and a silicone strip added to the end. After winding, it is put on the iron core and formed into a coil body after insulation and buffer wrapping.

[0018] The utility model adopts the above technical solution, and can achieve the following technical effects:

[0019] 1. Reasonable structure, stable performance, safe and reliable: The primary end of the product is wound into a spiral spring-shaped primary lead connected to the high-voltage end of the coil body. A cavity channel is set in the middle. It is vacuum cast with epoxy resin. The outer jacket is an integrated silicone rubber sleeve, and the outside is distributed with equally spaced silicone rubber umbrella skirts. It has the advantages of reasonable design structure, stable quality and performance, and safe and reliable operation.

[0020] 2. The voltage transformer is resistant to overvoltage shock and has a long service life: the primary end spiral spring-shaped primary lead prevents the primary overvoltage from being impacted when the high-speed train lifts the pantograph in excess of the phase. The insulation of the body coil is stable, ensuring the safety and reliability of the voltage transformer product and the safe operation of the high-speed train. The secondary terminal is located at the bottom of the product and is connected to the secondary junction box containing the miniature circuit breaker through a connecting wire. The miniature circuit breaker with a fuse has a switching function, which effectively protects the secondary line and is fully suitable for the installation of my country's railway contact network lines. The product has a long service life.

[0021] 3. Explosion-proof voltage transformer: The explosion-proof device is installed on the top of the main insulator to save installation space. If the primary coil generates hot air flow, it will be released instantly without accumulating to a certain pressure for a long time before releasing. It can solve the problem of transformer burning and explosion, will not endanger surrounding personnel, and reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a cross-sectional view of the explosion-proof voltage transformer for high-speed train contact power grid;

[0023] Figure 2 This is a partial enlarged view of the explosion-proof voltage transformer for high-speed train contact power grid;

[0024] Figure 3 This is the appearance diagram of the explosion-proof voltage transformer for high-speed train contact power grid;

[0025] Figure 4 This is a top view of the explosion-proof voltage transformer for high-speed train contact power grid;

[0026] Figure 5 This is a bottom view of the explosion-proof voltage transformer for the contact power grid of high-speed trains;

[0027] Figure 6 It is the wiring layout diagram of the miniature circuit breaker;

[0028] Figure 7 This is a cross-sectional view of the explosion-proof cover;

[0029] Figure 8 This is the end view of the explosion-proof cover;

[0030] Fig. 9 It is a schematic diagram of the shielding network structure;

[0031] Fig.10 This is the end diagram of the shielding net structure;

[0032] Explanation of the numbers in the figure: 1. Iron core; 2. Secondary winding; 3. Primary winding; 4. Coil body; 5. Main insulator; 6. Bottom plate; 7. Outer silicone rubber sleeve; 8. Silicon rubber shed; 9. High-voltage end shed; 10. Spring-shaped primary lead; 11. Shielding net; 12. Explosion-proof end cover; 13. Primary insert; 14. Electrostatic screen; 15. Spring; 16. Primary high-voltage terminal; 17. Fixing bolt; 18. Protective cover; 19. Cavity; 20. Grounding terminal; 21. Secondary junction box; 22. Secondary wiring terminal; 23. Miniature circuit breaker; 24. Outlet waterproof connector; 25. Guide rail; 26. Wiring trough; 27. Heat release direction; 28. Explosion-proof device; 29. ​​Rubber plug; 30. Metal parts; 31. Wire mesh. DETAILED DESCRIPTION

[0033] The principles of the present disclosure will be described below with reference to several example embodiments shown in the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way.

[0034] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment".

[0035] The present embodiment provides an explosion-proof voltage transformer for high-speed train contact power grid, which is manufactured as follows: the secondary winding 2 and the primary winding 3 are concentrically wound on an insulating frame, the primary winding is wound in two stages, each stage is externally provided with an electrostatic screen, and after winding, it is mounted on the iron core 1, and after being insulated and buffered, it is fixed in a casting mold, the primary lead is wound into a spring shape and then fixed with a primary insert 13, the shielding net 11 is fixed on the mold core mold, the four primary inserts 13 are connected together by winding with bare copper wire, the secondary terminal 22 is connected, the insulation distance is adjusted, and finally, epoxy resin is vacuum cast and cured into an integrated structure to form a main insulator 5, which is installed as a whole on a circular bottom plate 6, and a cavity 19 is provided at the high-voltage end, i.e., the upper part of the main insulator 5, which is conducive to the instantaneous release of heat generated by the primary winding when it accumulates to a certain level.

[0036] The main insulator 5 is encapsulated with an integrated outer silicone rubber sleeve 7 to form the external insulation of the transformer. The high-quality material has the properties of UV resistance, aging resistance, and condensation resistance. The bottom of the main insulator is provided with a secondary wiring terminal 22, which is convenient for users to make reliable sealing when wiring. The grounding terminal 20 is provided on the bottom plate 6 to facilitate users to ground;

[0037] The lower end of the primary insert 13 of the primary high-voltage terminal 16 is connected to the high-voltage end of the coil body through the spring-shaped primary lead 10. The shielding net 11 is located between the spring-shaped primary lead 10 and the cavity 19, and the cavity 19, the shielding net 11 and the spring-shaped primary lead 10 are concentric, shielding the high-voltage electric field outside the cavity to prevent the primary overvoltage from impacting the voltage body when the high-speed train lifting pantograph is over-phased, ensuring the safety and reliability of the product and the safe operation of the high-speed train. The shielding net 11 is made of spot welding of the cylindrical wire mesh 31 connected to the end arc-shaped metal part 30.

[0038] The explosion-proof device 28 includes an explosion-proof cover plate 12 and a plurality of heat release mechanisms, which are uniformly distributed around the periphery of the primary high-voltage terminal; when the heat generated by the primary winding of the product accumulates to a certain extent due to some reason and flows through the cavity 19 channel along the heat release direction 27, the spring 15 on the fixing bolt 17 is compressed to lift the primary explosion-proof cover plate 12 up and out of the gap to release the heat instantly, so that the product will not burn or explode, and the explosion-proof effect is achieved;

[0039] The main insulator 5 is cylindrical + truncated cone + cylindrical as a whole, ensuring that the resin insulation layer is uniform; a primary high-voltage terminal 16 is arranged on the top of the main insulator to realize direct electrical connection, and the lower end is intersected with the main insulator. After reliable resin insulation sealing, there will be no leakage discharge problem due to condensation on the surface of the product, and rainwater can flow away smoothly when used in outdoor operating environments; the external shape of the main insulator 5 is the inner cavity shape of the outer silicone rubber sleeve 7, and the lower part of the outer silicone rubber sleeve 7 is distributed with equally spaced silicone rubber sheds 8, which effectively increases the surface creepage distance of the product, improves the product's anti-fog flash capability under outdoor conditions, and ensures more reliable insulation.

[0040] The secondary junction box 21 is fixed on the base plate 6, and the secondary terminal 17 is connected to the secondary junction box 21 through a connecting wire. A miniature circuit breaker 23 and a guide rail 25 are arranged in the secondary junction box 21. A waterproof connector 24 for outgoing wires is arranged on one side. The miniature circuit breaker 23 with a fuse has a switch function and is arranged in parallel through the guide rail 25 to protect the product when a secondary line fails. The guide rail 25 is fastened to the base plate 6 to ensure permanent and reliable sealing under long life without falling off. A wiring groove 26 is formed between the bottom of the main insulator and the outer silicone rubber sleeve, and a rubber plug 29 is provided between the outer silicone rubber sleeve 7 and the connecting wire to ensure reliable sealing during secondary wiring.

[0041] The utility model high-speed train contact grid explosion-proof voltage transformer adopts a rolled iron core and utilizes the electromagnetic conversion principle to enable the secondary voltage to accurately reflect the change of the measured primary grid voltage and reliably and accurately transmit the grid voltage signal to the high-speed train control system.

[0042] The product adopts an integrated structure formed by vacuum pouring and curing of epoxy resin, is covered with an integrated outer silicone rubber sleeve, and is equipped with an explosion-proof device. It has the characteristics of reasonable structure, easy installation, large creepage distance, stable insulation, moisture and condensation resistance, overvoltage shock resistance, and stable explosion-proof performance. It further improves the reliability of safe operation of high-speed trains and can be used for various types of high-speed trains.

[0043] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0044] Although the claims in this application have been formulated with respect to particular combinations of features, it should be understood that the scope of the present disclosure also includes any novel feature or any novel combination of features disclosed herein, whether explicitly or implicitly or in any generalization thereof, whether or not it relates to the same scheme in any claim currently claimed.

Claims

1. Explosion-proof voltage transformer for high-speed train contact power grid, characterized in that: include: A main insulator having a cavity opened in the upper portion; A spring-shaped primary lead is located at the periphery of the cavity, the upper part of which is connected to the primary insert of the primary high-voltage terminal, and the lower part is connected to the high-voltage end of the coil body; a shielding mesh, located between the spring-shaped primary lead and the cavity; The explosion-proof device comprises an explosion-proof end cover and a plurality of heat release mechanisms, wherein the explosion-proof end cover is mounted on the top of a main insulator; each heat release mechanism comprises a spring, a fixing bolt and a protective cover, wherein the spring is sleeved on the upper portion of the fixing bolt, and the lower portion of the fixing bolt passes through the explosion-proof end cover and extends into the main insulator, and the protective cover covers the upper portion of the fixing bolt and the spring and is threadedly connected to a groove corresponding to the explosion-proof end cover.

2. The explosion-proof voltage transformer for high-speed train contact grid according to claim 1 is characterized in that: The main insulator adopts epoxy resin to vacuum cast and solidify the secondary winding, the primary winding, the iron core, the spring-shaped primary lead, the primary insert, and the shielding net into an integrated structure, which is located on the bottom plate.

3. The explosion-proof voltage transformer for high-speed train contact grid according to claim 2 is characterized in that: When the heat generated by the primary winding accumulates to a certain extent, it flows through the cavity in the direction of heat release. At this time, the spring on the fixing bolt is compressed to lift the explosion-proof cover plate out of the gap, releasing the heat instantly.

4. The explosion-proof voltage transformer for high-speed train contact network according to claim 2, characterized in that: A grounding terminal is arranged on one side of the bottom plate, and a secondary junction box is arranged on the other side. The secondary junction box is connected to the secondary junction terminal at the bottom of the main insulator.

5. The explosion-proof voltage transformer for high-speed train contact network according to claim 4, characterized in that: The secondary junction box is provided with a miniature circuit breaker with a fuse and a guide rail. The miniature circuit breakers are arranged in parallel via the guide rail, and the guide rail is fastened to the bottom plate.

6. The explosion-proof voltage transformer for high-speed train contact grid according to claim 1, characterized in that: The main insulator is enclosed by an integrated outer silicone rubber sleeve. The lower part of the outer silicone rubber sleeve has silicone rubber sheds arranged in parallel with equal intervals, and the upper part has high-voltage end sheds arranged in parallel with equal intervals.

7. The explosion-proof voltage transformer for high-speed train contact network according to claim 6, characterized in that: A wiring groove is formed between the bottom of the main insulator and the outer silicone rubber sleeve. The secondary wiring terminal is placed in the wiring groove and connected to one end of the connecting wire. The other end of the connecting wire passes through the outer silicone rubber sleeve and is connected to the secondary wiring box. A rubber plug is provided between the outer silicone rubber sleeve and the connecting wire.

8. The explosion-proof voltage transformer for high-speed train contact grid according to claim 1, characterized in that: The upper part of the main insulator is a cylindrical structure, and a primary high-voltage terminal is arranged on the top of the cylindrical structure; the middle part of the main insulator is a truncated cone transition structure; the lower part of the main insulator is also a cylindrical structure, and the coil body is accommodated in the cylindrical structure; the inner cavity shape of the outer silicone rubber sleeve matches the outer shape of the main insulator.

9. The explosion-proof voltage transformer for high-speed train contact grid according to claim 1, characterized in that: The cavity, the shielding net and the spring-shaped primary lead are arranged concentrically; the shielding net is made by spot welding a cylindrical iron wire mesh connected to an arc-shaped metal part at the end.

10. The explosion-proof voltage transformer for high-speed train contact network according to claim 2, characterized in that: The secondary winding and the primary winding are concentrically wound on an insulating frame. The primary winding is wound in two stages, and each stage is externally provided with an electrostatic screen. The electrostatic screen is made of capacitor composite paper wrapped with semi-conductive paper and a silicone strip added to the end. After winding, it is sleeved on the iron core and formed into a coil body after insulation and buffer wrapping.

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