Special tool for reliable circuit breaker anti-trip test and its use method

Abstract

The present application discloses a reliable circuit breaker anti-tripping test special tool and its use method, wherein the special tool includes an opening plug, a closing plug, a common plug and a switch; the switch is provided with a first terminal and a second terminal arranged opposite to each other; the common plug is connected to the first terminal, and the opening plug and the closing plug are connected in parallel to the second terminal. During the test, the opening plug, the closing plug and the common plug are respectively inserted into the opening terminal, the closing terminal and the positive terminal, and the switch is closed in the circuit breaker split state for testing; each plug is reliably connected to the corresponding terminal, and no hand support is required after connection, which avoids the interruption of the closing signal due to hand shaking and then the failure of the test, thereby improving the success rate of the anti-tripping test; in addition, the anti-tripping test can be performed by a single person using the special tool of the present application, reducing labor costs.

Description

Technical Field

[0001] The present application belongs to the technical field of circuit breaker anti-tripping test, and specifically relates to a reliable circuit breaker anti-tripping test special tool and a use method thereof. Background Art

[0002] In order to improve the operational reliability of high-voltage circuit breakers, the anti-trip test of high-voltage circuit breakers has received increasing attention. Among the large amount of annual calibration work, it is a heavy task to conduct anti-trip tests on a large number of circuit breakers.

[0003] At present, there is no standardized anti-tripping test tool in the industry. The main means of anti-tripping test is to connect two test wires at one end as the common end, insert the positive terminal, and the other two ends as the opening and closing ends, insert the opening and closing terminals. In theory, if the circuit breaker is closed and then opened after energy storage is completed and then does not close again, it means that the anti-tripping circuit is working correctly; if the circuit breaker is closed and then opened after energy storage is completed, and then closed and opened again, it means that the anti-tripping circuit is abnormal.

[0004] However, there are currently no special tools, and the test methods are crude. It is possible that the test line is separated from the positive terminal or the closing terminal after closing due to reasons such as shaking of the hands. This will also result in the situation that "the circuit breaker will not close again after closing and opening after energy storage is completed", but it cannot indicate that the circuit breaker circuit is operating correctly; that is, the existing anti-trip test may show that the anti-trip relay is damaged but the anti-trip test shows that it is normal. Therefore, the success rate of anti-trip tests using existing tools is low, so multiple tests are necessary. Only when multiple tests show that the anti-trip circuit is normal, the anti-trip test results are more reliable. However, multiple tests also reduce the mechanical life of the circuit breaker, and one person needs to monitor during the test, and the other two people need to hold the test line to conduct the test, which requires a large number of people. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a reliable circuit breaker anti-tripping test special tool and a method of using the same.

[0006] In the first aspect, the present application provides a reliable circuit breaker anti-tripping test special tool, including an opening plug, a closing plug, a common plug and a switch; the switch is provided with a first terminal and a second terminal arranged opposite to each other; the common plug is connected to the first terminal, and the opening plug and the closing plug are connected in parallel to the second terminal. During the test, the opening plug, the closing plug and the common plug are respectively inserted into the opening terminal, the closing terminal and the positive terminal, and the switch is closed in the circuit breaker split state for testing; each plug is reliably connected to the corresponding terminal, and no hand support is required after connection, which avoids the interruption of the closing signal due to hand shaking and then the failure of the test, thereby improving the success rate of the anti-tripping test; in addition, the anti-tripping test can be performed by a single person using the special tool of the present application, and there is no need to hold the test line in the same posture, which reduces the number of test personnel and reduces the work intensity.

[0007] Furthermore, the disconnect plug, the closing plug and the common plug all include pins; the pin diameter is variable. The pin must first be firmly fixed and in contact. Since the terminal diameter varies, the pin diameter needs to be thin enough to meet the requirements of all apertures of the terminal. At the same time, the cross-section must also meet the current flow capacity. After the terminal is inserted, the diameter can be adjusted to firmly fix the pin to the terminal.

[0008] Furthermore, a portion of the pin near the front end is provided with a slit that passes through the diameter, dividing the front end of the pin into two petals; an inner pin is movably connected inside the pin to push the front ends of the two petals apart, so that the front ends of the petals move outward perpendicular to the slit, thereby increasing the diameter of the front end of the pin, making the connection between the pin and the corresponding terminal more secure, or adapting to different models of terminals.

[0009] Furthermore, the insertion needle is provided with an inner bore that passes through the rear end surface; the front end of the inner bore is conical; the inner needle near the rear end is connected with the inner bore near the rear end through a threaded fit. By rotating the inner needle, the inner needle moves forward and backward; after the front end of the inner needle moves to the conical part of the inner bore, continuing forward will enable the front ends of the two insert petals to be pushed outward.

[0010] Furthermore, the front end of the inner needle is hemispherical, which makes it easier for the front end of the inner needle to move forward after moving to the conical part of the inner bore, and reduces the wear between the inner needle and the insertion needle.

[0011] Furthermore, an end cap made of insulating material is provided at the rear end of the inner needle to facilitate the rotation of the inner needle.

[0012] Furthermore, the switch includes a DC rocker switch body and a waterproof protective cover; the pins of the DC rocker switch body are located inside the waterproof protective cover, and the operation panel is located outside the waterproof protective cover. Since the rated current in the opening and closing coil is 0.2A and the voltage is positive and negative 110V, the switch that controls the positive power on and off can meet the requirements with an ordinary DC rocker switch. Since the ordinary rocker switch is not waterproof and the pins are exposed, a waterproof protective cover is added outside.

[0013] In a second aspect, the present application also provides a method for using the above-mentioned reliable circuit breaker anti-tripping test special tool, comprising the following steps:

[0014] Insert the opening plug, closing plug and common plug into the opening terminal, closing terminal and positive terminal connected to the positive power phase respectively and fix them;

[0015] When the circuit breaker is storing energy and in the open state, close the switch; if the circuit breaker is closed and then opened and does not close again after energy storage is completed, it means that the anti-tripping circuit is operating correctly; if the circuit breaker is closed and then opened and then closed again after energy storage is completed, it means that the anti-tripping circuit is abnormal.

[0016] The advantages and positive effects of this application are:

[0017] (1) Due to the crudeness of existing test methods, multiple tests are required to correctly test the reliability of the anti-tripping relay, resulting in a low success rate and reducing the mechanical life of the circuit breaker. The reliable circuit breaker anti-tripping test special tool provided by the present application can effectively improve the test success rate and can be operated by a single person, thus solving the problem of low success rate of the anti-tripping test.

[0018] (2) Existing test tools have poor safety and are prone to accidental contact and misconnection during use, resulting in defects such as short circuits and burning of circuit boards. The switch in the reliable circuit breaker anti-trip test tool provided by the present application can control the on and off of positive electricity, avoiding accidental contact of positive electricity and misconnection of terminals that may burn circuit boards, which can effectively improve the test fault tolerance rate and prevent misconnection.

[0019] (3) The existing test power generally requires two people to operate. During the test, the test tool is held to insert the three terminals into the opening and closing terminals respectively, and the other end is held to the positive terminal. The three terminals must also be kept in good contact, which makes the operation difficult. The reliable circuit breaker anti-trip test special tool provided in this application can directly insert the terminal into the terminal, thereby reducing the difficulty of the test.

[0020] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the advantages brought by the technical features of these technical solutions described above, other technical problems that can be solved by the present application, other technical features included in the technical solutions, and the advantages brought by these technical features will be further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 A schematic diagram of the structure of a reliable circuit breaker anti-tripping test special tool provided in Example 1 of the present application;

[0023] Figure 2 A schematic diagram of the structure of the opening plug / closing plug / common plug in the reliable circuit breaker anti-tripping test special tool provided in Example 1 of the present application;

[0024] Figure 3 A schematic diagram of the pin structure of the reliable circuit breaker anti-tripping test special tool provided in Example 1 of the present application;

[0025] Figure 4 A schematic diagram of the inner pin structure of the reliable circuit breaker anti-tripping test special tool provided in Example 1 of the present application;

[0026] Figure 5 This is a schematic diagram of the structure of the opening plug / closing plug / common plug in the special tool for reliable circuit breaker anti-tripping test provided in Example 2 of the present application.

[0027] In the figure: 10, opening plug; 20, closing plug; 30, common plug; 40, switch; 41, DC rocker switch body; 42, waterproof protective cover; 50, pin; 51, slit; 52, plug flap; 53, inner chamber; 60, rubber sleeve; 70, inner pin; 71, end cap; 72, top ball. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Example 1

[0031] Please refer to Figure 1 This embodiment provides a reliable circuit breaker anti-tripping test tool, including a disconnect plug 10, a closing plug 20, and a common plug 30. 2The test wire is used as a conductive wire. One end of the three wires is connected together, and the joints are sealed with insulating rubber. The other ends of the three wires are connected to the disconnection plug 10, the closing plug 20 and the common plug 30 respectively. A DC switch 40 is connected to the wire connected to the common plug 30; thus, the electrical connection relationship of the entire anti-tripping test special tool is that the common plug 30 is connected to the first terminal of the switch 40, and the disconnection plug 10 and the closing plug 20 are connected in parallel to the second terminal of the switch 40 opposite to the first terminal. A DC switch is set in the middle of the positive test wire to control the on and off of the positive electricity. During the test, one person inserts the three pins into the terminals at the corresponding positions and tightens them. After checking that they are correct, press the on button to connect the positive electricity. After the high-voltage circuit breaker is actuated, the reliability of the anti-tripping relay can be checked.

[0032] The opening plug 10, the closing plug 20 and the common plug 30 have the same structure. Figure 2 The opening plug 10, the closing plug 20 and the common plug 30 all include a plug pin 50 and a rubber sleeve 60 sleeved on the outside of the plug pin 50 near the rear end; the part near the front end of the plug pin 50 is provided with a slit 51 passing through the diameter, dividing the front end of the plug pin 50 into two plug flaps 52; the plug pin 50 is movably connected with an inner pin 70, which is used to push the front ends of the two plug flaps 52 apart, that is, to make the front ends of the plug flaps 52 move outward perpendicular to the slit 51, thereby increasing the diameter of the front end of the plug pin 50, so that the plug pin 50 is more firmly connected to the corresponding terminal, or to adapt to different types of terminals.

[0033] Please refer to further Figure 3 and Figure 4 The pin 50 is provided with an inner bore 53 which passes through the rear end surface; the front end of the inner bore 53 is conical; the front end of the inner needle 70 is hemispherical, and the rear end is provided with an end cap 71 of insulating material, which is connected to the inner bore 53 near the rear end through a threaded fit.

[0034] The selection of the variable diameter plug pin is the key to reliable circuit breaker anti-trip test. The first thing is to be able to firmly fix and contact. Since the terminal diameter varies, the diameter of the plug pin must meet the requirements of all hole diameters, so it must be made thin enough. At the same time, the cross section must meet the current flow capacity. After the terminal is inserted, the diameter can be adjusted to firmly fix the plug pin to the terminal. The terminal material used in this embodiment is high-quality red copper with a rated conductivity of 1.5A. The plug pin is made of ordinary 6mm 2 The pin is the base material, and the laser is used to cut it from the middle of one end to form two petals to ensure that the diameter does not decrease. The front end of the inner bore of the two petals is made into a semi-conical shape, that is, the front end of the inner bore of the entire pin is conical, and the end face of the other end is tapped to make a 2mm 2The internal thread is inserted into the screw hole of the end face by an internal needle. The front end face of the internal needle is semicircular, and the other end face has a 6mm long threaded section. The end head is an end cap made of insulating material. By inserting the internal needle into the pin and tightening the end cap, the semicircular end pushes the pin open on the semi-conical surface, and the diameter of the pin becomes larger.

[0035] The switch 40 includes a DC rocker switch body 41 and a waterproof protective cover 42; the pins of the DC rocker switch body 41 are located inside the waterproof protective cover 42, and the operation panel is located outside the waterproof protective cover 42. Since the rated current in the opening and closing coil is 0.2A and the voltage is positive and negative 110V, the switch for controlling the positive power on and off can be an ordinary DC rocker switch to meet the requirements. Since the ordinary rocker switch is not waterproof and the pins are exposed, a waterproof protective cover is added outside.

[0036] When selecting materials, the best conductive wire material for the reliable circuit breaker anti-trip test tool is multi-core soft wire. Because the conductive current is below 0.2A, the common test multi-core soft copper wire is preferred as the conductor. The wire diameter should not be too thick or too thin, preferably 4mm. 2 The plug material of the reliable circuit breaker anti-trip test tool should be copper, which can be made from ordinary gun-type banana plugs. Since it is difficult to process, it can be customized by professional factories, and the size should not exceed 6mm. 2 . Reliable circuit breaker anti-trip test special tools The switch that controls the positive power on and off can be selected from a variety of switches such as boat switches and push button switches, but they must meet the ability to disconnect DC power, the voltage is positive and negative 110V, and the current is not less than 0.2A. The waterproof seal on the outside of the switch can be covered with insulating rubber, the thickness of which should be suitable for separation and combination after covering. You can also use a waterproof junction box, open a window on the top surface, clamp the switch in the window, and seal it with waterproof glue on the outside.

[0037] This embodiment also provides a method for using the above-mentioned reliable circuit breaker anti-tripping test special tool, and the circuit breaker anti-tripping test method includes the following steps:

[0038] Insert the opening plug 10, closing plug 20 and common plug 30 into the opening terminal, closing terminal and positive terminal connected to the positive power connected to the circuit breaker respectively and fix them;

[0039] When the circuit breaker is storing energy and in the open position, close switch 40; if the circuit breaker is closed and then opened and does not close again after energy storage is completed, it indicates that the anti-tripping circuit operates correctly; if the circuit breaker is closed and then opened and then closed again after energy storage is completed, it indicates that the anti-tripping circuit is abnormal.

[0040] It should be noted that, since the internal structure of the opening and closing plugs and the circuit connection relationship in the special tool for anti-tripping test are the same, the closing plugs and the opening plugs can be used interchangeably in the anti-tripping test; in other words, the closing plug is inserted into the closing terminal in the anti-tripping test, and the opening plug is inserted into the opening terminal, while the closing terminal and the opening terminal are not distinguished during non-testing. Of course, for the standardization of operation, the closing terminal and the opening terminal can also be distinguished by words, letters, symbols, etc., or processed into different shapes, colors, or made of different materials for distinguishing use.

[0041] Example 2

[0042] The main part of this embodiment is the same as that of Embodiment 1, and the similarities are not repeated here; the difference between this embodiment and Embodiment 1 is that:

[0043] Please refer to Figure 5 In this embodiment, the inner bore 53 of the insertion needle is divided into three sections, the middle section is thin, and the front section and the rear section are thick; the connection between the middle section and the front section of the inner bore 53 is a conical surface. A top ball 72 is provided at the front end of the inner needle 70, and the diameter of the top ball 72 is larger than the diameter of the middle section of the inner bore 53 and smaller than or equal to the diameter of the front section of the inner bore 53. The inner needle 70 near the rear end is threadedly matched with the rear section of the inner bore 53. By rotating the inner needle, the inner needle is retreated from the front section of the inner bore 53 to the conical surface or the middle section of the inner bore 53 to push open the inserting petal 52. The further back the top ball 72 moves, the greater the separation of the inserting petal 52, so that the diameter of the insertion needle 50 becomes larger.

[0044] Since there are the above differences in the plug structure between this embodiment and embodiment 1, there are corresponding differences in the plug fixing method in the anti-jump test method. In embodiment 1, when the plug needs to be tightened, the end cap is rotated so that the inner needle moves to the front end; in this embodiment, when the plug needs to be tightened, the end cap is rotated in the opposite direction so that the inner needle moves backward.

[0045] The present invention is applied to the circuit breaker anti-tripping test, which can improve the success rate of the anti-tripping test, reduce the labor intensity of the experimenters, ensure the correct action of the anti-tripping relay, and prevent the circuit breaker from tripping during operation.

[0046] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A reliable circuit breaker anti-trip test special tool, characterized in that: It includes an opening plug, a closing plug, a common plug and a switch; the switch is provided with a first wiring terminal and a second wiring terminal which are arranged opposite to each other; the common plug is connected to the first wiring terminal, and the opening plug and the closing plug are connected in parallel to the second wiring terminal; The opening plug, closing plug and common plug all include pins; the diameter of the pins can be changed; A slit passing through the diameter is provided at the part of the insertion pin near the front end, dividing the front end of the insertion pin into two insertion petals; an inner needle is movably connected inside the insertion pin, used to push the front ends of the two insertion petals apart; The pin is provided with an inner bore that passes through the rear end surface. The inner bore of the pin is divided into three sections, with a thin middle section and thick front and rear sections. The connection between the middle section and the front section of the inner bore is a conical surface. A top ball is provided at the front end of the inner needle, and the diameter of the top ball is larger than the diameter of the middle section of the inner bore and smaller than or equal to the diameter of the front section of the inner bore. The inner needle is matched with the thread of the rear section of the inner bore near the rear end. By rotating the inner needle, the inner needle is retreated from the front section of the inner bore to the conical surface or the middle section of the inner bore to push open the inserting petals. The further back the position of the push ball moves, the greater the separation of the inserting petals, so that the diameter of the needle becomes larger. When it is necessary to tighten the plug, the end cap is rotated in the opposite direction to move the inner needle backward.

2. The reliable circuit breaker anti-tripping test special tool according to claim 1 is characterized in that: The rear end of the inner needle is provided with an end cap made of insulating material.

3. The reliable circuit breaker anti-tripping test special tool according to claim 1 is characterized in that: The switch comprises a DC rocker switch body and a waterproof protective cover; the pins of the DC rocker switch body are located inside the waterproof protective cover, and the operation panel is located outside the waterproof protective cover.

4. A method for using the special tool for reliable circuit breaker anti-tripping test according to any one of claims 1 to 3, characterized in that: The following steps are involved: Insert the opening plug, closing plug and common plug into the opening terminal, closing terminal and positive terminal connected to the positive power phase respectively and fix them; When the circuit breaker is storing energy and in the open state, close the switch; if the circuit breaker is closed and then opened and does not close again after energy storage is completed, it means that the anti-tripping circuit is operating correctly; if the circuit breaker is closed and then opened and then closed again after energy storage is completed, it means that the anti-tripping circuit is abnormal.

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