A medium and high voltage vacuum circuit breaker test device

Abstract

The utility model relates to the field of circuit breaker especially relates to a medium and high voltage vacuum circuit breaker test testing arrangement. The medium and high voltage vacuum circuit breaker test testing arrangement includes high voltage circuit breaker, tester, wherein, the one side of medium and high voltage circuit breaker is provided with plum blossom contact, and the outside of plum blossom contact all is provided with contact spring, the one side of medium and high voltage circuit breaker is provided with test fixture, and the both ends of test fixture can be connected with medium and high voltage circuit breaker, the tester and test fixture are connected through electric property, be provided with resistance test interface, conversion knob, pressure test interface on the tester. The medium and high voltage vacuum circuit breaker test testing arrangement provided by the utility model can realize self locking function through adjustable screw rod structure of test fixture, can guarantee that test fixture and plum blossom contact reliable contact, has guaranteed the reliability of test process.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, and in particular to a testing device for medium and high voltage vacuum circuit breakers. Background Technology

[0002] The conductivity of a circuit breaker's conductive circuit is crucial for ensuring the safe operation of the switch. The quality of conductivity can be reflected by the resistance of the conductive circuit. Therefore, IEC standards and national standards stipulate that manufacturers should measure the main circuit resistance of circuit breakers before they leave the factory, and there are specific parameters for the circuit resistance of various types of circuit breakers. Currently, everyone follows the national standard's test method of "using DC voltage method with a rated continuous current of not less than 100A" to test the main circuit resistance. For medium and high voltage vacuum circuit breakers, the circuit resistance measurement requires closing the circuit breaker and using a circuit resistance tester to clamp the incoming and outgoing side contacts to form a test circuit. The resistance values ​​of each of the three phases (A, B, and C) are measured, and the conductivity of the circuit breaker is determined by these resistance values, thus determining the circuit breaker's performance. The pressure of the circuit breaker's sprite contacts is a major factor affecting the measurement of the resistance of the conductive circuit. Currently, most manufacturers do not test the pressure of the sprite contacts, but only judge the performance of the circuit breaker by testing the circuit resistance. This cannot accurately reflect the performance of the circuit breaker.

[0003] Existing circuit resistance testing devices are equipped with torsion spring clamps, which present several problems during testing. Firstly, the clamps are inconvenient to operate, cannot clamp securely, and the clamping force relies on the torsion spring. High torsion spring torque requires effort to operate, while low torque results in unreliable clamping. Furthermore, prolonged use reduces torque, shortening the clamp's lifespan. Secondly, clamping the clamps onto the circuit breaker's L-shaped contacts can easily damage the testing equipment and the contacts. This is mainly because the circuit breaker's L-shaped contacts have an external circular binding spring. During testing, the clamps easily clamp the spring, causing the high current flowing through the testing equipment to overheat and damage the spring. This overheating can also lead to short circuits, causing test termination or even direct damage to the testing equipment. Thirdly, existing circuit resistance testers can only measure the circuit breaker's circuit resistance and cannot determine the L-shaped contact pressure, resulting in limited functionality and low cost-effectiveness.

[0004] Therefore, it is necessary to provide a new testing device for medium and high voltage vacuum circuit breakers to solve the above-mentioned technical problems. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a testing device for medium and high voltage vacuum circuit breakers is provided to solve the above-mentioned problems.

[0006] The testing device for medium and high voltage vacuum circuit breakers provided by this utility model includes: a medium and high voltage circuit breaker and a testing instrument; wherein, a staggered contact is provided on one side of the medium and high voltage circuit breaker, and a contact spring is provided on the outer side of each staggered contact; a test fixture is provided on one side of the medium and high voltage circuit breaker, and both ends of the test fixture can be connected to the medium and high voltage circuit breaker; the testing instrument and the test fixture are electrically connected; a resistance test interface, a conversion knob, and a pressure test interface are provided on the testing instrument; the test fixture includes a fixture bracket, and the fixture bracket is located on one side of the staggered contact, and a movable fixture bracket is slidably fitted on the upper part of the fixture bracket, and both ends of the fixture bracket and the movable fixture bracket are equipped with connecting ends, and a resistance test head and a pressure test head are respectively connected to both ends of the fixture bracket and the movable fixture bracket through the connecting ends.

[0007] Preferably, the test fixture further includes clamping plates installed at both ends of the fixture support, each clamping plate having an oblong hole, and both sides of the fixture moving support having guide threaded holes, each oblong hole having a guide screw slidably fitted therein, and each guide screw being rotatably connected to the guide threaded hole by a thread.

[0008] Preferably, a connecting bolt is provided below the fixture bracket, and a cylindrical smooth surface is connected to the top of the connecting bolt. The fixture bracket has a light hole for the cylindrical smooth surface to pass through. The top of the cylindrical smooth surface passes through the light hole and is connected with a thread. A retaining spring groove is provided on the top outer side of the cylindrical smooth surface, and a shaft retaining spring is provided in the retaining spring groove. The shaft retaining spring is located on the top of the fixture bracket. A connecting threaded hole corresponding to the thread is provided on the fixture moving bracket. The thread and the connecting threaded hole are rotatably connected by the thread.

[0009] Preferably, the resistance test interface on the tester is configured as a circuit, the pressure test interface is configured as a circuit, the resistance test head is electrically connected to the resistance test interface, and the pressure test interface and the pressure test head are electrically connected.

[0010] Preferably, both the resistance test head and the pressure test head are made of metal and are semi-circular in shape.

[0011] Preferably, the clamp bracket, the clamp moving bracket, the guide screw, the connecting bolt, and the shaft retaining ring are all made of insulating material.

[0012] Compared with related technologies, the testing device for medium and high voltage vacuum circuit breakers provided by this utility model has the following advantages:

[0013] This invention utilizes an adjustable screw structure in the test fixture to achieve a self-locking function, ensuring reliable contact between the test fixture and the Phillips head, thus guaranteeing the reliability of the testing process.

[0014] This invention allows the test fixture to be inserted from the middle of the plum blossom contact, achieving contact with the inner surface of the plum blossom contact and avoiding contact with the external binding spring of the plum blossom contact, thus preventing damage to the test equipment and the plum blossom contact.

[0015] This invention enables multi-functional applications through a testing instrument. Not only does the testing instrument feature a conversion knob, a resistance testing interface, and a pressure testing interface, allowing it to perform two functions in one device, but the testing fixture is also equipped with different testing heads at both ends, enabling the testing of circuit breaker circuit resistance and plum blossom contact pressure.

[0016] This invention features a simple and convenient testing instrument and fixture, providing reliable and effective test data. It offers manufacturers a more accurate basis for judgment while ensuring the high reliability and performance of the products. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure (loop resistance test connection) of a preferred embodiment of the medium and high voltage vacuum circuit breaker testing device provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shown is a preferred embodiment of the medium- and high-voltage vacuum circuit breaker testing device provided by this utility model (contact pressure test connection).

[0019] Figure 3 for Figure 1 The diagram shows the structure of the test fixture.

[0020] Figure 4 for Figure 1 The diagram shows the structure of the clamp bracket.

[0021] Figure 5 for Figure 1 The diagram shows the structure of the movable support of the clamp.

[0022] Figure 6 for Figure 1 The diagram shows the structure of the connecting bolt;

[0023] Figure 7 for Figure 1 The diagram shows the test head being inserted into the Phillips head contact point.

[0024] Figure 8 This is a schematic diagram of the chuck-type fixture shown in Embodiment 2;

[0025] Figure 9 for Figure 1 The diagram shows the rear view of the circuit breaker.

[0026] The diagram is labeled as follows: 1. Medium and high voltage circuit breaker; 101. Plum blossom contact; 102. Contact spring; 2. Tester; 201. Resistance test interface; 202. Conversion knob; 203. Pressure test interface; 3. Test fixture; 301. Resistance test head; 302. Pressure test head; 303. Fixture bracket; 304. Fixture moving bracket; 305. Guide screw; 306. Adjusting bolt; 307. Shaft circlip; 31. Smooth hole; 32. Waist-shaped hole; 33. Connecting end; 34. Adjusting threaded hole; 35. Guide threaded hole; 36. Thread; 37. Circlip groove; 38. Cylindrical smooth surface; 4. Chuck fixture; 41. Adjusting screw; 42. Chuck connector. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0029] Example 1

[0030] This utility model provides a testing device for medium and high voltage vacuum circuit breakers. The testing device includes: a medium and high voltage circuit breaker 1 and a testing instrument 2; wherein, a plum blossom contact 101 is provided on one side of the medium and high voltage circuit breaker 1, and a contact spring 102 is provided on the outer side of each plum blossom contact 101; a test fixture 3 is provided on one side of the medium and high voltage circuit breaker 1, and both ends of the test fixture 3 can be connected to the medium and high voltage circuit breaker 1; the testing instrument 2 and the test fixture 3 are electrically connected; a resistance test interface 201, a conversion knob 202, and a pressure test interface 203 are provided on the testing instrument 2; The test fixture 3 includes a fixture support 303, which is located on one side of the plum blossom contact 101. A movable fixture support 304 is slidably fitted above the fixture support 303. Both ends of the fixture support 303 and the movable fixture support 304 are equipped with connecting ends 33. Both ends of the fixture support 303 and the movable fixture support 304 are respectively connected to a resistance test head 301 and a pressure test head 302 through the connecting ends 33. The test fixture 3 also includes clamping plates installed on both sides of the fixture support 303. Each clamping plate has an oblong hole 32. Both sides of the movable fixture support 304 have guide threaded holes 35. Each oblong hole 32 is fitted with a guide screw 305, and each guide screw 305 is connected to a guide threaded hole 35 via a thread. A connecting bolt 306 is located below the fixture bracket 303, and a cylindrical smooth surface 38 is connected to the top of the connecting bolt 306. A light hole 31 is provided on the fixture bracket 303 for the cylindrical smooth surface 38 to pass through. The top of the cylindrical smooth surface 38 passes through the light hole 31 and is connected by a thread 36. A retaining ring groove 37 is provided on the outer top of the cylindrical smooth surface 38, and a shaft retaining ring 307 is provided in the retaining ring groove 37. The shaft retaining ring 307 is located on the top of the fixture bracket 303. The fixture moving bracket 304... The upper part has a connecting threaded hole 34 corresponding to the thread 36. The thread 36 and the connecting threaded hole 34 are connected by the thread rotation. The resistance test interface 201 on the tester 2 is set to 3 channels, and the pressure test interface 203 is set to 6 channels. The resistance test head 301 is electrically connected to the resistance test interface 201, and the pressure test interface 203 and the pressure test head 302 are electrically connected. The resistance test head 301 and the pressure test head 302 are both made of metal and are semi-circular in shape. The fixture bracket 303, the fixture moving bracket 304, the guide screw 305, the connecting bolt 306 and the shaft snap ring 307 are all made of insulating material.

[0031] It should be noted that the tester 2 is equipped with a conversion knob 202, a resistance test button, a pressure test button, a resistance test interface 201, a pressure test interface 203, a display, and a printer. The conversion knob 202 allows for different performance data testing by rotating it. Different tests are performed by pressing the resistance test button and the pressure test button. The two buttons, as well as the two buttons and the conversion knob 202, are electrically interlocked for protection. The display shows and allows for real-time display and viewing of test data, and the printer prints the test data. The resistance test head 301 and the pressure test head 302 are respectively mounted on the same side of the fixture bracket 303 and the fixture movable bracket 304. The fixture bracket 303 and the fixture movable bracket 304 are connected by a connecting bolt 306 and a shaft retaining spring 307. Guide screws 305 are arranged at both ends of the two sides of the fixture movable bracket 304. The adjusting bolt 306 is an integral structure, with a hexagonal knob at one end and a stud at the other. The part connecting the two ends is a smooth cylindrical structure with a retaining spring groove 37. The smooth cylindrical surface of the adjusting bolt 306 is clearance-fitted with the central hole 31 of the fixture bracket 303. The stud part of the adjusting bolt 306 is threadedly connected to the central threaded through hole of the fixture moving bracket 304. Guide screws 305 are installed at the guide threaded holes 35 at both ends of the fixture moving bracket 304. The cylindrical surface of the guide screws 305 is inside the oblong hole 32 on the clamping plate of the fixture bracket 303. The resistance test interface 201 on the tester 2 is set to 3 channels to realize the simultaneous measurement of the resistance of the three-phase circuits A, B, and C of the circuit breaker. The pressure test interface 203 is set to 6 channels to realize the simultaneous measurement of the pressure of the six plum blossom contacts 101 of the three-phase circuits A, B, and C of the circuit breaker. The test diameter can be adjusted and locked using the adjusting bolt 306. One end of the test fixture 3 is fitted with a resistance test head 301 for loop resistance testing, and the other end with a pressure test head 302 for pressure testing of the Phillips head contact 101. Changing the direction allows for measurement of test data for different performance characteristics. The conversion knob 202 of the tester 2 controls the measurement of resistance and pressure in two different directions. When measuring loop resistance, first turn the conversion knob 202 to the vertical position. Then, electrically connect the resistance test head 301 to the resistance test interface 201 on the tester 2. Next, rotate the resistance test head 301 counterclockwise using the adjusting bolt 306 so that the outer diameter of the two resistance test heads 301 on the fixture support 303 and the fixture moving support 304 is smaller than the inner diameter of the Phillips head contact 101. Then, insert it into the upper Phillips head contact 101 port of phase A and rotate the adjusting bolt 306 clockwise to ensure reliable contact between the two resistance test heads 301 and the inner surface of the Phillips head contact 101. Then, the connection of the test fixture 3 inside the lower plum blossom contact 101 of phase A is completed in the same way. Finally, the resistance of phase A circuit of the circuit breaker is measured by the test resistance button on the tester 2. The measured value is directly displayed on the tester display and the test data can be printed by the printer.The tester 2 is equipped with three circuit resistance test interfaces 201 and six sets of test fixtures 3, enabling simultaneous measurement of the resistance of the three-phase circuits A, B, and C of the circuit breaker. When measuring the pressure of the circuit breaker's plum blossom contact 101, first turn the conversion knob 202 on the tester 2 to the horizontal position, then electrically connect the pressure test head 302 to the pressure test interface 203 on the tester 2. Using the same method, adjust the outer diameter of the two pressure test heads 302 on the fixture bracket 303 and the fixture moving bracket 304 to match the size of the stationary contact that mates with the plum blossom contact 101 (in actual operating conditions, the circuit breaker's plum blossom contact and the switchgear's stationary contact are used together; therefore, to measure the accurate pressure value of the plum blossom contact, the outer diameter of the pressure test head needs to be adjusted to match the outer diameter of the stationary contact, resulting in a reasonable and valid value). Then push it in from the center of the plum blossom contact 101 port. Finally, measure the pressure of one plum blossom contact using the test pressure button on the tester 2. The tester is equipped with 6 pressure test interfaces and 6 sets of test fixtures, enabling simultaneous pressure measurement of all 6 octagonal contacts of a circuit breaker. Test data can be directly displayed on a monitor and printed out using a printer.

[0032] Example 2

[0033] In this embodiment, the tester 2 remains unchanged, but the test fixture 304 of the test device is set as a chuck-type fixture. Its structural principle is the same as that of a three-jaw chuck, which is existing technology and will not be described in detail here. The chuck-type fixture includes a chuck fixture 4, an adjusting screw 41, and a chuck connector 42. The adjusting screw 41 passes through the chuck fixture 4 and connects to the chuck connector 42. The resistance test head 301 and the pressure test head 302 are mounted on the chuck connector 32. By rotating the adjusting screw 41, the chuck connector 42 at the front of the chuck fixture 4 is opened and closed, thereby adjusting the size of the test head to achieve contact measurement with the plum blossom contact 101.

[0034] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0035] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A testing device for medium and high voltage vacuum circuit breakers, characterized in that, include: Medium and high voltage circuit breakers (1), testers (2); Among them, the medium and high voltage circuit breaker (1) is provided with a plum blossom contact (101) on one side, and a contact spring (102) is provided on the outer side of the plum blossom contact (101). A test fixture (3) is provided on one side of the medium- and high-voltage circuit breaker (1), and both ends of the test fixture (3) can be connected to the medium- and high-voltage circuit breaker (1). The tester (2) and the test fixture (3) are electrically connected; The tester (2) is provided with a resistance test interface (201), a conversion knob (202), and a pressure test interface (203). The test fixture (3) includes a fixture bracket (303), and the fixture bracket (303) is located on one side of the plum blossom contact (101). A fixture movable bracket (304) is slidably fitted above the fixture bracket (303). Both ends of the fixture bracket (303) and the fixture movable bracket (304) are equipped with connecting ends (33). Both ends of the fixture bracket (303) and the fixture movable bracket (304) are respectively connected to a resistance test head (301) and a pressure test head (302) through the connecting ends (33).

2. The testing apparatus for medium and high voltage vacuum circuit breakers according to claim 1, characterized in that, The test fixture (3) also includes clamping plates installed at both ends of the fixture bracket (303). Each clamping plate has a waist-shaped hole (32). Both sides of the fixture moving bracket (304) have guide thread holes (35). Each waist-shaped hole (32) is slidably fitted with a guide screw (305). Each guide screw (305) is connected to the guide thread hole (35) by a threaded rotation.

3. The testing apparatus for medium and high voltage vacuum circuit breakers according to claim 2, characterized in that, A connecting bolt (306) is provided below the fixture bracket (303). A cylindrical smooth surface (38) is connected to the top of the connecting bolt (306). A light hole (31) is provided on the fixture bracket (303) for the cylindrical smooth surface (38) to pass through. The top of the cylindrical smooth surface (38) passes through the light hole (31) and is connected to a thread (36). A retaining ring groove (37) is provided on the top of the outer side of the cylindrical smooth surface (38), and a retaining ring (307) for shaft is provided in the retaining ring groove (37). The retaining ring (307) for shaft is located on the top of the fixture bracket (303). A connecting threaded hole (34) corresponding to the thread (36) is provided on the fixture moving bracket (304). The thread (36) and the connecting threaded hole (34) are connected by the thread rotation.

4. The testing apparatus for medium and high voltage vacuum circuit breakers according to claim 3, characterized in that, The resistance test interface (201) on the tester (2) is configured with (3) channels, the pressure test interface (203) is configured with (6) channels, the resistance test head (301) is electrically connected to the resistance test interface (201), and the pressure test interface (203) and the pressure test head (302) are electrically connected.

5. The testing apparatus for medium and high voltage vacuum circuit breakers according to claim 4, characterized in that, The resistance test head (301) and the pressure test head (302) are both made of metal and are semi-circular in shape.

6. The testing apparatus for medium and high voltage vacuum circuit breakers according to claim 5, characterized in that, The clamp bracket (303), the clamp moving bracket (304), the guide screw (305), the connecting bolt (306), and the shaft retaining ring (307) are all made of insulating material.

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