A transformer partial discharge test device

Abstract

This utility model provides a transformer partial discharge testing device, mainly relating to the field of transformer technology. The device includes a housing and metal electrodes. The metal electrodes are slidably disposed on the top of the housing. A rectangular cylinder is fixedly disposed on the top of the housing. A support frame is slidably disposed inside the rectangular cylinder. A limiting block is hinged to the outside of the rectangular cylinder, and the limiting block abuts against the side of the support frame. An L-shaped fixing plate is fixedly disposed on the outside of the rectangular cylinder, and a DC solenoid valve is fixedly disposed on the L-shaped fixing plate. The end of the DC solenoid valve abuts against the limiting block. The advantages of this utility model are: after the test is completed or the monitoring system detects an abnormality, the metal electrodes can be quickly and safely separated from the transformer, effectively avoiding the risk of electric shock due to residual charge and greatly ensuring the safety of operators.

Description

Technical Field

[0001] This utility model mainly relates to the field of transformer technology, specifically a transformer partial discharge test device. Background Technology

[0002] In the field of electrical equipment testing, transformers are the core test object, and the connection and disconnection of their metal electrodes are crucial in the testing process. Currently, the connection structure between the metal electrodes and the transformer mostly adopts traditional bolt-fastening or plug-in connections. After the test, these connection methods present numerous safety hazards and efficiency issues. On the one hand, bolt-fastening connections require operators to perform multiple disassembly and assembly operations using tools, a cumbersome and time-consuming process. Furthermore, the residual charge on the metal electrodes during disassembly and assembly can easily lead to electric shock, seriously threatening the operator's life. On the other hand, while plug-in connections are relatively simple to operate, their connection stability is poor. Loosening may occur during the test, affecting the accuracy of test data, and the safety issues caused by residual charge cannot be avoided when separating them after the test. In addition, regardless of the connection method, it is difficult to achieve rapid separation of the metal electrodes from the transformer, resulting in low post-test equipment processing efficiency and seriously affecting the test progress. Utility Model Content

[0003] To achieve the above objectives, this utility model employs the following technical solution:

[0004] A transformer partial discharge test device includes a housing and metal electrodes. The metal electrodes are slidably disposed on the top of the housing. A rectangular tube is fixedly disposed on the top of the housing. A support frame is slidably disposed inside the rectangular tube. A limiting block is hinged to the outside of the rectangular tube. The limiting block abuts against the side of the support frame. An L-shaped fixing plate is fixedly disposed on the outside of the rectangular tube. A DC solenoid valve is fixedly disposed on the L-shaped fixing plate. The end of the DC solenoid valve abuts against the limiting block.

[0005] A spring is fixedly installed at the bottom of the support frame, and the other end of the spring is fixedly connected to the bottom of the inner wall of the rectangular tube. The side of the support frame is fixedly provided with slots, and the limiting block abuts against the inner wall of the slot. An arc-shaped groove is opened on the support frame, and the arc-shaped groove is sleeved on the outer ring of the metal electrode. A retaining ring is fixedly installed near the top of the outer ring of the metal electrode, and the retaining ring abuts against the bottom of the support frame. An insulating plate is provided between the retaining ring and the support frame. A sleeve is fixedly installed at the top of the box, and an insulating cylinder is fixedly installed on the inner wall of the sleeve. The metal electrode is slidably connected to the inner wall of the insulating cylinder.

[0006] A detection frame is fixedly installed at the bottom of the inner wall of the box, and an insulating frame is fixedly installed on the inner wall of the detection frame. A transformer is placed inside the insulating frame. A grounding wire is fixedly installed at the bottom of the box and connected to the bottom of the transformer. The bottom of the metal electrode abuts against the top of the transformer. A current sensor is fixedly installed at the bottom of the inner wall of the box, and an insulating rod is fixedly installed on the side of the current sensor. The current sensor is electrically connected to the grounding wire.

[0007] The box body has a hinged door on the front and a ventilation grille arrayed on the rear. A shell is fixedly installed on the side of the box body, and ventilation openings are arrayed on the shell. A fan is fixedly installed inside the shell, and a heating resistance wire is fixedly installed on the inner side wall of the box body near the fan.

[0008] Compared with the existing technology, the beneficial effects of this utility model are:

[0009] This utility model has a simple structure and is easy to install and use. When the test is completed or the monitoring system detects an abnormality, it can quickly and safely separate the metal electrode from the transformer, effectively avoiding the risk of electric shock caused by residual charge and greatly protecting the life safety of operators. There is no need for complicated disassembly and assembly steps, and the separation of the metal electrode from the transformer can be completed quickly, which significantly improves the overall efficiency of the test process. Attached Figure Description

[0010] Appendix Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Appendix Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0012] Appendix Figure 3 This is a cross-sectional structural schematic diagram of the present invention;

[0013] Appendix Figure 4 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0014] The following are the labels shown in the attached diagram: 1. Housing; 2. Metal electrode; 3. Rectangular cylinder; 4. Support frame; 5. Limiting block; 6. L-shaped fixing plate; 7. DC solenoid valve; 8. Spring; 9. Slot; 10. Retaining ring; 11. Sleeve; 12. Detection frame; 13. Insulating frame; 14. Grounding wire; 15. Current sensor; 16. Insulating rod; 17. Fan; 18. Heating resistance wire. Detailed Implementation

[0015] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0016] Referring to the accompanying drawings, a transformer partial discharge test device includes a housing 1 and a metal electrode 2. The metal electrode 2 is slidably disposed on the top of the housing 1. A rectangular tube 3 is fixedly disposed on the top of the housing 1. A support frame 4 is slidably disposed inside the rectangular tube 3. A limiting block 5 is hinged to the outside of the rectangular tube 3. The limiting block 5 abuts against the side of the support frame 4. An L-shaped fixing plate 6 is fixedly disposed on the outside of the rectangular tube 3. A DC solenoid valve 7 is fixedly disposed on the L-shaped fixing plate 6. The end of the DC solenoid valve 7 abuts against the limiting block 5. This structural design enables the metal electrode 2 to be quickly separated and disconnected.

[0017] A spring 8 is fixedly installed at the bottom of the support frame 4, and the other end of the spring 8 is fixedly connected to the bottom of the inner wall of the rectangular tube 3. The support frame 4 has a fixed array of slots 9 on its side, and the limiting block 5 abuts against the inner wall of the slot 9. An arc-shaped groove is opened on the support frame 4, and the arc-shaped groove is sleeved on the outer ring of the metal electrode 2. A retaining ring 10 is fixedly installed near the top of the outer ring of the metal electrode 2, and the retaining ring 10 abuts against the bottom of the support frame 4. An insulating plate is provided between the retaining ring 10 and the support frame 4. A sleeve 11 is fixedly installed at the top of the box 1, and an insulating cylinder is fixedly installed on the inner wall of the sleeve 11. The metal electrode 2 is slidably connected to the inner wall of the insulating cylinder.

[0018] A detection frame 12 is fixedly installed at the bottom of the inner wall of the housing 1. An insulating frame 13 is fixedly installed on the inner wall of the detection frame 12. The insulating frame 13 is made of insulating material such as rubber. A transformer is placed inside the insulating frame 13. A grounding wire 14 is fixedly installed at the bottom of the housing 1 and connected to the bottom of the transformer. The bottom of the metal electrode 2 abuts against the top of the transformer. A current sensor 15 is fixedly installed at the bottom of the inner wall of the housing 1. An insulating rod 16 is fixedly installed on the side of the current sensor 15. The current sensor 15 is electrically connected to the grounding wire 14. This structural design detects the current signal transmitted on the grounding wire 14 and transmits it to an external receiving device.

[0019] The enclosure 1 has a hinged door on the front and a ventilation grille arrayed on the back. A shell is fixedly installed on the side of the enclosure 1, and ventilation openings are arrayed on the shell. A fan 17 is fixedly installed inside the shell. A heating resistance wire 18 is fixedly installed on the inner wall of the enclosure 1 near the fan 17. This structural design allows observation of the partial discharge of the transformer under high temperature conditions.

[0020] When using this device, open the door of the enclosure 1, place the transformer to be tested stably inside the insulating frame 13, press down the support frame 4 to make the metal electrode 2 contact the top of the transformer, ensure that the bottom of the transformer is reliably connected to the grounding wire 14, connect the current sensor 15 to the grounding wire 14 to ensure that the discharge current signal of the transformer can be monitored in real time and transmitted to the external receiving device, close the door, start the fan 17 and the heating resistance wire 18 to raise the temperature inside the enclosure to the high temperature required for the test (simulating the actual operating environment of the transformer), and then energize the metal electrode 2;

[0021] The data transmitted by the current sensor 15 is analyzed in real time by an external receiving device to monitor the partial discharge of the transformer under high temperature and high pressure. When the monitoring system detects an abnormality (such as excessive discharge or sudden change in discharge frequency) or when the test ends, the external control system immediately sends an energizing signal to the DC solenoid valve 7. The end of the solenoid valve 7 presses the limit block 5 to disengage from the slot 9, the support frame 4 loses its lock, the spring 8 releases its elastic potential energy, and pushes the metal electrode 2 to move quickly upward along the sleeve 11 to separate from the transformer.

[0022] Confirm that the current sensor 15 shows zero current, ensure that the circuit is completely disconnected, turn off the heating resistance wire 18, keep the fan 17 running, and turn off the fan after the temperature inside the chamber drops to room temperature. Open the chamber door, disconnect the relevant connections, and take out the transformer after the test.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transformer partial discharge testing device, comprising a housing (1) and metal electrodes (2), characterized in that: The metal electrode (2) is slidably disposed on the top of the box (1). A rectangular tube (3) is fixedly disposed on the top of the box (1). A support frame (4) is slidably disposed inside the rectangular tube (3). A limiting block (5) is hinged to the outside of the rectangular tube (3). The limiting block (5) abuts against the side of the support frame (4). An L-shaped fixing plate (6) is fixedly disposed on the outside of the rectangular tube (3). A DC solenoid valve (7) is fixedly disposed on the L-shaped fixing plate (6). The end of the DC solenoid valve (7) abuts against the limiting block (5).

2. The transformer partial discharge test device according to claim 1, characterized in that: A spring (8) is fixedly installed at the bottom of the support frame (4), and the other end of the spring (8) is fixedly connected to the bottom of the inner wall of the rectangular tube (3). The support frame (4) has slots (9) fixedly arranged in an array on its side. The limiting block (5) abuts against the inner wall of the slot (9). An arc-shaped groove is opened on the support frame (4). The arc-shaped groove is fitted around the outer ring of the metal electrode (2). A retaining ring (10) is fixedly installed near the top of the outer ring of the metal electrode (2). The retaining ring (10) abuts against the bottom of the support frame (4). An insulating plate is provided between the retaining ring (10) and the support frame (4). A sleeve (11) is fixedly installed at the top of the box (1). An insulating cylinder is fixedly installed on the inner wall of the sleeve (11). The metal electrode (2) is slidably connected to the inner wall of the insulating cylinder.

3. The transformer partial discharge test device according to claim 1, characterized in that: A detection frame (12) is fixedly installed at the bottom of the inner wall of the housing (1). An insulating frame (13) is fixedly installed on the inner wall of the detection frame (12). A transformer is placed inside the insulating frame (13). A grounding wire (14) is fixedly installed at the bottom of the housing (1). The grounding wire (14) is connected to the bottom of the transformer. The bottom of the metal electrode (2) abuts against the top of the transformer. A current sensor (15) is fixedly installed at the bottom of the inner wall of the housing (1). An insulating rod (16) is fixedly installed on the side of the current sensor (15). The current sensor (15) is electrically connected to the grounding wire (14).

4. The transformer partial discharge test device according to claim 1, characterized in that: The box (1) has a hinged door on the front and a ventilation grille arrayed on the back. The box (1) has a shell fixedly installed on the side, and ventilation openings arrayed on the shell. A fan (17) is fixedly installed inside the shell, and a heating resistance wire (18) is fixedly installed on the inner wall of the box (1) near the fan (17).

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