Circuit breaker large-current direct-current resistance test patch cord device

Abstract

A circuit breaker large-current direct-current resistance test patch cord device comprises a cylindrical conductor, an insulation positioning column and a clamping part, the insulation positioning column and the clamping part are located at the two ends of the cylindrical conductor respectively, the clamping part is a conductor, a blind hole is formed in the end, connected with the insulation positioning column, of the cylindrical conductor, and one end of the insulation positioning column is inserted into the blind hole and then fixed. The insulation positioning column is used for being inserted into an insertion hole in the end portion of a rod-shaped conductor, the cylindrical conductor is clamped by a plum blossom contact finger to conduct electricity, and a wire clamp used for testing is clamped on the clamping portion, so that a tester can rapidly and conveniently carry out direct-current resistance measurement of the circuit breaker without damaging the contact finger of the circuit breaker, and the testing efficiency is improved. And the measured data can truly reflect the contact condition of the circuit breaker under the operation condition.

Description

Technical Field

[0001] The utility model relates to the technical field of high - current test of circuit breakers, in particular to a conversion wiring device for direct - current resistance test of high - current of circuit breakers. Background Technique

[0002] A circuit breaker is an important device for power distribution in a power system. During the process of opening and closing the current, the moving and static contacts of the circuit breaker will be ablated. For the convenience of maintenance, the circuit breaker also adopts a removable handcart design. The circuit breaker and the switch cabinet are connected by finger contacts. Only the reliable contact between the moving and static contacts of the circuit breaker itself and the finger contacts and the switch cabinet can ensure the safe and stable operation of the circuit breaker. To detect and judge the state of the circuit breaker contacts and the contact situation between the finger contacts and the switch cabinet, usually a large current is used to measure the direct - current resistance of the circuit breaker with finger contacts to indirectly judge. At present, a large current of 100A is passed through the upper and lower contact arms of the circuit breaker, and the voltage - drop method is used to measure the direct - current resistance of this circuit.

[0003] The existing method is to directly clamp the current wire clamp of the direct - current resistance tester on the finger contacts of the circuit breaker in the shape of a plum blossom, and then clamp the voltage connection clamp inside the current wire clamp.

[0004] There are two problems with the existing test wiring method. One is that the current test wire clamp is relatively thick, while the plum - blossom finger contacts are relatively dense, resulting in difficulty in clamping the finger contacts from the side and may fall off during the test. If directly clamped on the working contact surface of the finger contacts from the front, it may damage the silver - plated layer of the contact surface, resulting in an increase in the contact resistance between the finger contacts and the rod - shaped contacts, causing the circuit - breaker contacts to overheat and endangering the safe operation of the equipment. The other is that the current wire clamp and the test wire are relatively thick and heavy. If directly clamped on the finger contacts, it may cause the finger contacts to tilt due to their own weight, resulting in poor contact of the finger contacts, making the measurement condition inconsistent with the actual condition of the circuit breaker, the measured data being distorted, affecting the judgment of the test data, and may also cause permanent deformation of the finger contacts and damage the equipment. Content of the Utility Model

[0005] The purpose of the utility model is to provide a conversion wiring device for direct - current resistance test of high - current of circuit breakers, enabling testers to quickly and conveniently carry out the direct - current resistance measurement of circuit breakers, without damaging the finger contacts of the circuit breaker, and the measured data can truly reflect the contact situation under the operating conditions of the circuit breaker.

[0006] To achieve the above - mentioned purpose, the utility model provides a conversion wiring device for direct - current resistance test of high - current of circuit breakers, including a cylindrical conductor, an insulating positioning post, and a clamping part. The insulating positioning post and the clamping part are respectively located at both ends of the cylindrical conductor. The clamping part is a conductor. One end of the cylindrical conductor connected to the insulating positioning post is provided with a blind hole, and one end of the insulating positioning post is inserted into the blind hole and fixed.

[0007] The outer circumference of the cylindrical conductor is provided with a silver - plated layer.

[0008] The cylindrical conductor and the clamping part are of an integral structure.

[0009] There is a tapered part between the cylindrical conductor and the clamping part, and the clamping part is located in the block structure.

[0010] Anti-slip patterns are provided on the clamping part.

[0011] An exhaust structure is provided on the insulating positioning post.

[0012] The exhaust structure is a groove axially provided on the outer wall of the insulating positioning post.

[0013] The exhaust structure is a vent hole axially provided in the insulating positioning post.

[0014] The utility model has the following technical effects compared with the prior art:

[0015] 1. The insulating positioning post of the utility model is used to be inserted into the insertion hole at the end of the rod-shaped conductor. The cylindrical conductor is clamped and conducted by the plum blossom finger contacts, and the wire clamp for the test is clamped on the clamping part, enabling the test personnel to quickly and conveniently carry out the direct current resistance measurement of the circuit breaker without damaging the finger contacts of the circuit breaker, and the measured data can truly reflect the contact situation under the operating conditions of the circuit breaker.

[0016] 2. In order to ensure the stability of the insulating positioning post after being inserted into the insertion hole, the outer diameter of the insulating positioning post should have a smaller clearance with the insertion hole. When the clearance is reduced, the air in the insertion hole is not easily discharged. Therefore, an exhaust structure is provided on the insulating positioning post. In this way, when the insulating positioning post is inserted into the insertion hole, the air in the insertion hole is discharged from the exhaust structure, facilitating the quick insertion of the insulating positioning post.

[0017] 3. The utility model almost restores the real working conditions of the finger contacts of the circuit breaker, making the measured loop resistance value more accurate and reliable, providing strong technical support for the diagnostic analysis and condition assessment of the equipment, and ensuring the safe and stable operation of the power equipment and system. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0019] Figure 1 It is a front view structural schematic diagram of the utility model.

[0020] Figure 2 It is a left view structural schematic diagram of the utility model.

[0021] Figure 3 It is a top view structural schematic diagram of the utility model.

[0022] Figure 4 This is a state diagram used in the present utility model.

[0023] In the figure:

[0024] A cylindrical conductor 10, a silver-plated layer 11, a blind hole 12, and a tapered portion 13;

[0025] Insulating positioning column 20, vent hole 21;

[0026] Clamping portion 30, anti-slip pattern 31;

[0027] Rod-shaped conductor 40 , plum blossom contact finger 41 , insertion hole 42 , circuit breaker 50 , circuit breaker contact 51 . DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] See also Figure 4 The circuit breaker 50 has a circuit breaker contact 51 inside, and the upper and lower ends of the circuit breaker 50 are respectively provided with a rod-shaped conductor 40, and the end of the rod-shaped conductor 40 is installed with a plum blossom contact finger 41, and the end of the rod-shaped conductor 40 also has an insertion hole 42.

[0030] See also Figures 1-4 A circuit breaker high current DC resistance test adapter device includes a cylindrical conductor 10, an insulating positioning column 20 and a clamping part 30. The insulating positioning column 20 and the clamping part 30 are respectively located at the two ends of the cylindrical conductor 10. The clamping part 30 is a conductor. The end of the cylindrical conductor 10 connected to the insulating positioning column 20 is provided with a blind hole 12. One end of the insulating positioning column 20 is inserted into the blind hole 12 and fixed. The insulating positioning column 20 is used to be inserted into the insertion hole 42 at the end of the rod-shaped conductor 40. The cylindrical conductor 10 is clamped by the plum blossom contact finger 41 for conduction. The wire clamp used for the test is clamped on the clamping part 30, so that the test personnel can quickly and conveniently carry out the DC resistance measurement of the circuit breaker without damaging the circuit breaker contact finger, and the measured data can truly reflect the contact situation under the operating condition of the circuit breaker.

[0031] The insulating positioning column 20 can isolate the contact between the column-shaped conductor 10 and the rod-shaped conductor 40 , so that the measuring current completely flows through the plum blossom contact finger 41 .

[0032] Of course, an annular groove matching with the plum blossom contact finger 41 may be further provided on the cylindrical conductor 10 .

[0033] Preferably, the columnar conductor 10 and the clamping portion 30 are made of copper material, and the insulating positioning column 20 is made of an insulating material with a certain yield strength, such as epoxy resin.

[0034] Further, a silver plating layer 11 is provided on the outer circumference of the cylindrical conductor 10, which improves the electrical conductivity between the cylindrical conductor 10 and the plum blossom contact finger 41.

[0035] Preferably, the cylindrical conductor 10 and the clamping portion 30 are of an integral structure.

[0036] Specifically, a tapered portion 13 is provided between the cylindrical conductor 10 and the clamping portion 30, and the clamping portion 30 is located in a block structure. When the clamping portion 30 is a block, the contact surface with the wire clamp can be increased.

[0037] Further, anti-slip lines 31 are provided on the clamping portion 30, which improves the friction with the wire clamp and prevents the wire clamp from slipping. The anti-slip lines 31 can be grooves corresponding to and cooperating with the wire clamp, or knurling patterns.

[0038] Further, in order to ensure the stability of the insulating positioning post 20 after being inserted into the insertion hole 42, the outer diameter of the insulating positioning post 20 should have a smaller gap with the insertion hole 42. In the case of a reduced gap, the air in the insertion hole 42 is not easily discharged. Therefore, an exhaust structure is provided on the insulating positioning post 20. In this way, when the insulating positioning post 20 is inserted into the insertion hole 42, the air in the insertion hole 42 is discharged from the exhaust structure, which facilitates the quick insertion of the insulating positioning post 20.

[0039] In one embodiment, the exhaust structure is a groove axially provided on the outer wall of the insulating positioning post 20. Not shown in the figure, the groove provided on the outer wall of the insulating positioning post 20 is similar to the groove structure on a spline shaft.

[0040] In another embodiment, see Figure 1 、 4 , the exhaust structure is a vent hole 21 axially provided in the insulating positioning post 20. One end of the vent hole 21 is located at the right end of the insulating positioning post 20, and the other end is located at the outer wall on the side close to the cylindrical conductor 10.

[0041] The working principle or operation process of the present utility model is as follows:

[0042] During test wiring, see Figure 4 , one end of the insulating positioning post 20 of the present device is inserted into the rod-shaped conductor 40 of the circuit breaker 50. During the insertion process, the air in the insertion hole 42 can be discharged through the exhaust structure, which is convenient for insertion and extraction. Since the length and outer diameter dimensions of the insulating positioning post 20 can just be inserted without shaking and are easy to insert and extract, it plays a role in fixing the cylindrical conductor 10 and can prevent the contact finger from tilting and being damaged due to the gravity of the test wire clamp during wiring.

[0043] After inserting this device, the cylindrical conductor 10 can be fixed on the breaker contact arm and can make good contact with the contact finger, simulating the real working condition of the breaker, and at the same time preventing the silver-plated contact surface from being pinched.

[0044] Then clamp the test current wire on the clamping part 30. Under the action of the anti-slip stripes, the test wire clamp can be conveniently and reliably connected. Then clamp the voltage test wire clamp on the inner side of the clamping part 30 and pass a large test current to accurately measure the DC resistance of the complete breaker conductive loop with petal-shaped contacts and arcing contacts.

[0045] After the test is completed, remove the test wire clamp and pull out this device.

Claims

1. A circuit breaker high current DC resistance test adapter device, characterized in that: The invention comprises a columnar conductor (10), an insulating positioning column (20) and a clamping portion (30), wherein the insulating positioning column (20) and the clamping portion (30) are respectively located at two ends of the columnar conductor (10), the clamping portion (30) is a conductor, and a blind hole (12) is provided at one end of the columnar conductor (10) connected to the insulating positioning column (20), and one end of the insulating positioning column (20) is inserted into the blind hole (12) and then fixed.

2. A circuit breaker high current DC resistance test adapter device according to claim 1, characterized in that: The outer circumference of the columnar conductor (10) is provided with a silver-plated layer (11).

3. A circuit breaker high current DC resistance test adapter device according to claim 1, characterized in that: The columnar conductor (10) and the clamping portion (30) are an integral structure.

4. A circuit breaker high current DC resistance test adapter device according to claim 3, characterized in that: A tapered portion (13) is provided between the columnar conductor (10) and the clamping portion (30), and the clamping portion (30) is located in the block structure.

5. A circuit breaker high current DC resistance test adapter device according to claim 1 or 4, characterized in that: The clamping portion (30) is provided with anti-slip patterns (31).

6. A circuit breaker high current DC resistance test adapter device according to claim 1, characterized in that: An exhaust structure is provided on the insulating positioning column (20).

7. A circuit breaker high current DC resistance test adapter device according to claim 6, characterized in that: The exhaust structure is a groove axially arranged on the outer wall of the insulating positioning column (20).

8. A circuit breaker high current DC resistance test adapter device according to claim 6, characterized in that: The exhaust structure is a vent hole (21) axially arranged in the insulating positioning column (20).

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