Test device for verifying main loop resistance measurement capability

Abstract

The utility model discloses a testing device for verifying the measuring capability of a main loop resistor, which comprises a left copper bar and a right copper bar which are supported by an insulating support rod at an interval, a shunt is arranged on the inner side of one copper bar, and a vacuum arc-extinguishing chamber is arranged on the inner side of the other copper bar; one end of the diverter is connected and assembled on the copper bar, the other end of the diverter is connected to a moving contact end of the vacuum arc-extinguishing chamber through a flexible connecting piece, and a static contact end of the vacuum arc-extinguishing chamber is connected and assembled on the copper bar; the moving contact end and the static contact end of the vacuum arc-extinguishing chamber are kept normally closed, the shunt and the vacuum arc-extinguishing chamber form a closed loop between the two copper bars, and after equipment to be tested is connected to the two copper bars, the test of measuring capability verification is realized, and the verification result is effectively guaranteed; and the test device is simple in overall structure, compact in layout, low in manufacturing cost, convenient to transport and operate, particularly suitable for standardization and consistency of operation for standardizing capability verification, and good in practicability.

Description

Technical Field

[0001] This utility model relates to the technical field of resistance measurement capability verification devices, and in particular to a test device for verifying the resistance measurement capability of a main circuit. Background Technology

[0002] Main circuit resistance measurement is a crucial testing item for high-voltage electrical products during factory inspection, type testing, and preventative testing. Main circuit resistance refers to the resistance of all conductive parts in the power transmission circuit of switching and control equipment. It is one of the quantitative indicators for evaluating the conductivity of electrical equipment. It primarily tests the contact condition of switch contacts and the conductor connections in high-voltage switches, on-load tap changers, and other switching equipment. Excessive resistance will lead to increased losses, abnormal heating, insulation aging, and even fires. Imbalanced three-phase resistance will result in different three-phase voltage drops, increasing equipment losses, causing malfunctions, and shortening equipment lifespan. Therefore, switch manufacturers, power transmission and distribution units, power construction and installation units, and railway maintenance units must test the circuit resistance when inspecting, installing, maintaining, and repairing various types of switching equipment.

[0003] For measuring the main circuit resistance of high-voltage electrical products, relevant standards require the use of a main circuit resistance tester capable of generating a DC 100A output current as the resistance measuring device. Therefore, it is necessary to verify the main circuit resistance measurement capabilities of the main circuit resistance testers used by various manufacturers. By determining whether the resistance values ​​measured by the manufacturer's main circuit resistance tester using the standard testing device meet the requirements, the qualification of the manufacturer's main circuit resistance tester can be verified.

[0004] For proficiency testing equipment, it is required to be easy to transport, low in cost, and easy to operate. These characteristics are of great positive significance to the smooth operation of proficiency testing activities.

[0005] Existing proficiency testing resistance measurement devices generally suffer from problems such as excessive size, inconvenient transportation, high cost, and cumbersome operation, which are not conducive to the conduct of proficiency testing activities. Utility Model Content

[0006] To address the aforementioned issues, this application provides a test device for verifying the measurement capability of the main circuit resistance, thereby enabling the verification test and effectively ensuring the verification results. Furthermore, the device has a simple overall structure, low manufacturing cost, is easy to transport, and is convenient to operate. It is particularly suitable for standardizing and ensuring consistency in the operation of proficiency verification, and has good practicality.

[0007] The technical solution adopted in this utility model is as follows:

[0008] A test device for verifying the main circuit resistance measurement capability includes two copper busbars supported at intervals by insulating rods. A shunt is installed inside one copper busbar, and a vacuum interrupter is installed inside the other copper busbar. One end of the shunt is connected to and mounted on the copper busbar, and the other end of the shunt is connected to the moving contact end of the vacuum interrupter via a flexible connector. The stationary contact end of the vacuum interrupter is connected to and mounted on the copper busbar. The moving contact end and the stationary contact end of the vacuum interrupter are normally closed, and the shunt and the vacuum interrupter form a closed circuit between the two copper busbars.

[0009] As a further improvement to the above technical solution:

[0010] It also includes a shielding layer that blocks the top of the shunt, with the top of the copper busbar extending upwards through the shielding layer.

[0011] It also includes a housing, in which the test device is housed, and the circumferential edge of the shielding layer is conformally matched to the circumferential shape of the inner wall of the housing.

[0012] An insulating fastener layer is provided on the inner circumference of the enclosure below the shielding layer. The end of the insulating support rod extending outward from the copper busbar is equipped with a support component, and the outer wall of the support component is conformally adapted to the inner wall of the insulating fastener layer.

[0013] The box has an upward-opening structure, and a flip cover is installed at the top opening of the box. A locking device is installed between the flip cover and the upper edge of the box.

[0014] The top of the copper busbar is provided with terminals and voltage measurement points spaced at intervals.

[0015] The voltage measurement point is spaced 10mm from the terminal block, and the voltage measurement point is silver-plated.

[0016] The flexible connector is a multi-layer copper foil, and its two ends are connected to the shunt and the moving contact end respectively via bolts.

[0017] It also includes an insulating rod installed at the moving contact end, the insulating rod sliding through the copper busbar, an end block fixedly fitted on the insulating rod, and a compression spring fitted on the insulating rod between the end block and the inner wall of the copper busbar; the compression spring causes the moving contact end to remain closed towards the stationary contact end.

[0018] The insulating support rod includes two rods arranged at an interval, with the upper insulating support rod located above the shunt and the lower insulating support rod located below the vacuum interrupter; the insulating support rod is made of epoxy resin.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention enables a test to verify the measurement capability by connecting the device under test to two copper busbars. By combining the vacuum interrupter and shunt, a closed loop is formed between the two copper busbars, effectively ensuring the verification results. Furthermore, the test device has a simple overall structure, low manufacturing cost, is easy to transport, and is convenient to operate. It is especially suitable for standardizing and ensuring consistency in the operation of proficiency testing, and has good practicality.

[0021] This utility model also has the following advantages:

[0022] The experimental device of this utility model is essentially a main circuit resistance simulation device, housed inside the box and fixedly connected to the box. It does not need to be disassembled during actual operation, nor can it be disassembled. It can be used through the exposed copper busbar, making it easy to operate. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the present invention.

[0024] Figure 2 This is an exploded view of the present invention.

[0025] Figure 3 This is a schematic diagram showing the layout of the copper busbar shunt, vacuum interrupter, etc. of this utility model.

[0026] Figure 4 This is a schematic diagram showing the installation of the insulating rod, compression spring, and flexible connector of this utility model.

[0027] Figure 5 This is a connection diagram for the experimental operation of this utility model.

[0028] The components include: 1. Enclosure; 2. Shielding layer; 3. Copper busbar; 4. Vacuum interrupter; 5. Insulating support rod; 6. Shunt; 7. Flexible connector; 8. Compression spring; 9. Insulating rod; 10. Device under test;

[0029] 11. Locking element; 12. Flip cover; 13. Insulating fastener layer; 14. Support element;

[0030] 31. Voltage measurement point; 32. Current input point;

[0031] 81. End block. Detailed Implementation

[0032] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 and Figure 3As shown, the test device for verifying the main circuit resistance measurement capability in this embodiment includes two copper busbars 3 supported at intervals by insulating support rods 5. A shunt 6 is installed inside one copper busbar 3, and a vacuum interrupter 4 is installed inside the other copper busbar 3. One end of the shunt 6 is connected to and mounted on the copper busbar 3, and the other end of the shunt 6 is connected to the moving contact end of the vacuum interrupter 4 via a flexible connector 7. The stationary contact end of the vacuum interrupter 4 is connected to and mounted on the copper busbar 3. The moving contact end and the stationary contact end of the vacuum interrupter 4 are normally closed, and the shunt 6 and the vacuum interrupter 4 form a closed circuit between the two copper busbars 3.

[0034] In this embodiment, after the device under test 10 is connected to two copper busbars 3, the test for measuring capability verification is realized. Combined with the setting of vacuum interrupter 4 and shunt 6, a closed loop is formed between the two copper busbars 3, which effectively ensures the verification results. Moreover, the test device has a simple overall structure, low manufacturing cost, is easy to transport, and is convenient to operate. It is especially suitable for standardizing and ensuring consistency of operation in proficiency verification.

[0035] It also includes a shielding layer 2 that shields the top of the shunt 6, with the top of the copper busbar 3 extending upward through the shielding layer 2.

[0036] In this embodiment, by setting a shielding layer 2 above the splitter 6, the splitter 6 is concealed and placed in a non-visible area, simplifying the appearance of the test device and preventing the operators from contacting the internal structure of the test device, thus helping to ensure the objectivity of the verification test.

[0037] It also includes a housing 1, in which the test device is housed. The circumferential edge of the shielding layer 2 is circumferentially conforming to the inner wall of the housing 1, effectively ensuring reliable shielding of the splitter 6 by the shielding layer 2.

[0038] The inner wall of the box 1 located below the shielding layer 2 is provided with an insulating fastener layer 13. The end of the insulating support rod 5 extending outward from the copper busbar 3 is equipped with a support member 14. The outer wall of the support member 14 is conformally adapted to the inner wall of the insulating fastener layer 13. This effectively ensures the insulation and relative position of the test device inside the box 1, and can be fixed inside the box 1 by combining with insulating bolts.

[0039] The box body 1 has an upward opening structure. A flip cover 12 is installed at the opening at the top of the box body 1. A locking element 11 is installed between the flip cover 12 and the upper edge of the box body 1 to facilitate transportation and carrying.

[0040] The top of the copper busbar 3 is equipped with terminals and voltage measurement points 31 spaced apart at the top and bottom.

[0041] In this embodiment, voltage is measured through voltage measurement point 31 via a test device 10, such as a resistance tester, located outside the terminal block.

[0042] The voltage measurement point 31 is 10mm away from the terminal block, and the voltage measurement point 31 is silver-plated.

[0043] The flexible connector 7 is made of multi-layer copper foil. Both ends of the flexible connector 7 are connected to the shunt 6 and the moving contact end by bolts, which effectively ensures the electrical connection of the circuit.

[0044] like Figure 4 As shown, it also includes an insulating rod 9 installed at the moving contact end. The insulating rod 9 slides through the copper busbar 3. An end block 81 is fixedly fitted on the insulating rod 9. A compression spring 8 is fitted on the insulating rod 9 between the end block 81 and the inner wall of the copper busbar 3. The compression spring 8 causes the moving contact end to remain closed towards the stationary contact end.

[0045] In this embodiment, the end of the insulating rod 9 is connected to the moving contact end of the vacuum interrupter 4. The insulating rod 9 is driven axially by the compression spring 8 via the end block 81, so that the moving contact fits against the stationary contact; the insulating rod 9 serves as a structural support.

[0046] The insulating support rod 5 consists of two rods arranged at an interval, one above the other. The upper insulating support rod 5 is located above the shunt 6, and the lower insulating support rod 5 is located below the vacuum interrupter 4. The insulating support rod 5 is made of epoxy resin.

[0047] In this embodiment, a test device simulating the single-phase main circuit of a high-voltage circuit breaker is composed of a vacuum interrupter 4, a compression spring 8, a shunt 6, a flexible connector 7, and a copper busbar 3. The vacuum interrupter 4 is used to simulate the main circuit structure of the circuit breaker, and the compression spring 8 simulates the contact closing force of the circuit breaker.

[0048] In this embodiment, the rated parameters of the shunt 6 can be set to 750A / 75mV to match the main circuit impedance, thereby increasing the overall resistance value to the range of a typical high-voltage circuit breaker and closely simulating real working conditions; the rated current of the vacuum interrupter 4 can be set to 630A to simulate the main circuit structure of a 630A circuit breaker; the pre-compression of the compression spring 8 is set to 3mm to simulate the contact closing force of a normal circuit breaker and ensure the stability of the contact resistance.

[0049] like Figure 5 As shown, during operation, the operator uses a resistance tester with an output of DC110A to apply a constant DC current through the current input point 32 on the terminal block, and measures the voltage drop across the circuit at the voltage measurement point 31. The resistance is calculated using Ohm's law R=V / I. At the same time, the test temperature is required to be 5℃~40℃ and the relative humidity is required to be below 75%. Temperature and humidity should be monitored at appropriate locations, and the ambient temperature should be kept basically stable throughout the test.

[0050] When performing the main circuit resistance measurement capability verification operation, the operator can perform three measurements and calculate the average value to realize the measurement capability verification test of the resistance tester.

[0051] This invention enables the testing of measurement proficiency verification, effectively ensuring the verification results. Furthermore, the test device has a simple overall structure, low manufacturing cost, is easy to transport, and is convenient to operate. It is particularly suitable for standardizing and ensuring consistency in proficiency verification operations, and has good practicality.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A test apparatus for verifying the ability to measure the resistance of a main circuit, characterized in that: It includes two copper busbars (3) supported by insulating rods (5) at intervals. A shunt (6) is installed inside one copper busbar (3), and a vacuum interrupter (4) is installed inside the other copper busbar (3). One end of the shunt (6) is connected to the copper busbar (3), and the other end of the shunt (6) is connected to the moving contact end of the vacuum interrupter (4) via a flexible connector (7). The stationary contact end of the vacuum interrupter (4) is connected to the copper busbar (3). The moving contact end and the stationary contact end of the vacuum interrupter (4) are normally closed. The shunt (6) and the vacuum interrupter (4) form a closed loop between the two copper busbars (3).

2. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 1, characterized in that: It also includes a shielding layer (2) that shields the top of the shunt (6), with the top of the copper busbar (3) extending upward through the shielding layer (2).

3. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 2, characterized in that: It also includes a box (1), the test device is housed in the box (1), and the circumferential edge of the shielding layer (2) is circumferentially conforming to the inner wall surface of the box (1).

4. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 3, characterized in that: An insulating fastener layer (13) is provided on the inner wall of the box (1) located below the shielding layer (2). The end of the insulating support rod (5) extending outward from the copper busbar (3) is equipped with a support member (14). The outer wall of the support member (14) is conformally adapted to the inner wall of the insulating fastener layer (13).

5. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 3, characterized in that: The box (1) has an upward opening structure. A flip cover (12) is installed at the upper opening of the box (1). A locking element (11) is installed between the flip cover (12) and the upper edge of the box (1).

6. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 1, characterized in that: The copper busbar (3) has terminals and voltage measurement points (31) spaced at intervals at the top and bottom.

7. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 6, characterized in that: The voltage measurement point (31) is spaced 10mm apart from the terminal block, and the voltage measurement point (31) is silver-plated.

8. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 1, characterized in that: The flexible connector (7) is a multilayer copper foil, and both ends of the flexible connector (7) are connected to the shunt (6) and the moving contact end by bolts, respectively.

9. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 1, characterized in that: It also includes an insulating rod (9) installed at the moving contact end, the insulating rod (9) slides through the copper busbar (3), an end block (81) is fixedly fitted on the insulating rod (9), and a compression spring (8) is fitted on the insulating rod (9) between the end block (81) and the inner wall of the copper busbar (3); the compression spring (8) causes the moving contact end to remain closed towards the stationary contact end.

10. The test apparatus for verifying the main circuit resistance measurement capability as described in claim 1, characterized in that: The insulating support rod (5) includes two rods arranged at an interval between the upper and lower parts. The upper insulating support rod (5) is located above the shunt (6), and the lower insulating support rod (5) is located below the vacuum interrupter (4). The insulating support rod (5) is made of epoxy resin.

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