A multifunctional aviation plug extension cord for circuit breaker mechanical characteristics test

Abstract

The invention discloses a multifunctional aviation plug extension cord for mechanical characteristic test of circuit breaker, wherein a female plug interface, a mechanical characteristic tester connection port and an extension cord interface are integrated on a female plug housing, and the extension cord cable is connected to a male plug on a switch cabinet side, and the electrical connection between them is controlled by a switching switch. The multifunctional aviation plug extension cord connection mode for mechanical characteristic test of circuit breaker of the invention is efficient and convenient, which reduces the encroachment on the time of the entire circuit breaker maintenance construction due to the long time of mechanical characteristic test of 10KV circuit breaker, improves the speed of circuit breaker construction, improves the power supply reliability, and optimizes the connection mode between the circuit breaker aviation plug and the control line, making the connection of the control line simpler, clearer, safer and more reliable.

Description

Technical Field

[0001] The invention relates to a multifunctional aviation plug extension cord assembly for a circuit breaker mechanical characteristic test in the field of electric power engineering. Background Art

[0002] The rapid development of social economy has led to an increasing amount of electricity consumption by residents today. New substations of various voltage levels have been built and put into operation like mushrooms after rain. With the continuous increase in the number of substations, the workload of substation equipment installation, handover test and operation and maintenance has continued to increase. According to the equipment status maintenance requirements of the State Grid: the equipment status maintenance cycle of 10KV circuit breakers is 4 years, and can be extended by up to 1 to 2 years according to the equipment status evaluation. The number of 10KV circuit breakers to be overhauled each year is huge, and the workload is very huge.

[0003] When inspecting and repairing 10KV circuit breakers, one of the inspection items is to conduct mechanical characteristic tests on the circuit breakers, measure the opening and closing time, bounce, speed, opening and closing action voltage of the circuit breaker, etc., to determine whether the actual parameters of the circuit breaker meet the standard requirements, analyze and judge whether the opening and closing springs of the circuit breaker are aging; whether the opening and closing mechanisms are deformed and damaged, causing the action parameters to exceed the standard, and determine whether the various parts of the circuit breaker have been adjusted to the best state. If the mechanical characteristics of the circuit breaker are unqualified, after the circuit breaker is put into operation, if the opening and closing action voltages are unqualified, the phenomenon of refusal to open, refusal to close, wrong opening, and wrong closing may occur. If the opening and closing time, bounce, speed, etc. of the circuit breaker are unqualified, the arc extinguishing time of the circuit breaker may be prolonged, which may cause the circuit breaker to burn or even cause serious accidents such as explosion of the circuit breaker. Therefore, it is very necessary and must be done to conduct mechanical characteristic tests on 10KV circuit breakers.

[0004] When conducting a mechanical property test on a 10KV circuit breaker, it is necessary to connect the mechanical property test instrument to the circuit breaker aviation plug. The test instrument sends a voltage pulse to the designated pin in the circuit breaker aviation plug through a connecting line. The designated pin in the air plug is connected to the circuit breaker opening and closing coil, and the voltage pulse drives the circuit breaker opening and closing coil to operate to test the opening and closing coil action voltage value and use the full voltage pulse corresponding to the opening and closing coil to operate the circuit breaker to measure the opening and closing time, bounce, speed and other parameters of the circuit breaker. However, at present, the mechanical property test instrument and the circuit breaker aviation plug cannot be perfectly connected, which brings certain difficulties to the construction and affects the construction speed and safety. The main problems faced include:

[0005] 1. Due to the wide variety of 10KV circuit breaker aviation plug models, the number of pins in various models of 10KV circuit breaker aviation plugs, the distribution and actual positions of the pins corresponding to each function are inconsistent, and the operating personnel cannot quickly identify the functions of the pins of the 10KV circuit breaker aviation plug to make connections;

[0006] 2. Due to the large number and density of pins in the aviation plug of the circuit breaker, and the different types of circuit breaker aviation plugs have different pin sorting methods and label positions, it is easy for operators to make wrong pin selections when connecting, connecting the wrong row or column, resulting in some unknown faults or component damage caused by the input voltage being connected to some unknown circuits during testing;

[0007] 3. Aviation plugs of different models cannot match the unified mechanical property test instrument of the connector, resulting in problems such as poor contact, unstable connection, and insufficient stability during connection. Summary of the invention

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a multifunctional aviation plug extension cord for a circuit breaker mechanical property test, which can realize a convenient and efficient connection between the circuit breaker aviation plug and a mechanical property test instrument.

[0009] A technical solution to achieve the above purpose is: a multifunctional aviation plug extension cord for circuit breaker mechanical characteristic test, comprising a circuit breaker side female plug, an extension cord cable and a switch cabinet side male plug;

[0010] The female plug on the circuit breaker side is composed of a female plug shell, a female socket and an extension cord connection port; the female plug shell is a square shell structure, and three connection ports for connecting the female plug on the circuit breaker side to the mechanical property test device are opened on its upper surface, and a switching switch adjacent to the connection port is provided on its upper surface; the female socket is arranged at the bottom of the female plug shell to be connected to the circuit breaker aviation plug; the extension cord connection port is arranged on the side of the female plug shell, the extension cord cable is connected to the extension cord connection port, and the male plug on the switch cabinet side is connected to the end of the extension cord cable;

[0011] The female socket is electrically connected to the extension cord connection port and the extension cord cable through the switching switch.

[0012] Furthermore, the switching switch controls the connection relationship between the female socket, the connection port and the extension line connection port by means of internal short circuit, and its specific circuit structure is as follows:

[0013] The switching switch is a four-linked switch, including a control switch, and a first switch, a second switch, a third switch and a fourth switch respectively connected to the control switch and controlled by the control switch, the control switch is arranged on the female plug housing, the first switch, the second switch, the third switch and the fourth switch are respectively connected to the four incoming lines of the female socket, wherein the second switch and the fourth switch are short-circuited with each other; the connection port is divided into a first connection port, a second connection port and a third connection port;

[0014] When the control switch is in the characteristic test position, the first switch is connected to the first connection port, the second switch and the fourth switch are connected to the second connection port, and the third switch is connected to the third connection port; when the control switch is in the relay protection verification position, the first switch, the second switch, the third switch and the fourth switch are respectively connected to the four outgoing lines of the extension cable in the extension cable connection port.

[0015] Furthermore, it is characterized in that the bottom of the female plug shell is provided with an outwardly protruding female socket mounting interface, and the female socket is installed in the female socket mounting interface.

[0016] Furthermore, the female socket mounting interface is provided with a docking lock structure, which wraps the connecting section and the snap section, and the end of the connecting section is provided with a connecting screw hole, and the snap section and the connecting section form a hook-type structure. The four docking lock structures are rotatably arranged on the side wall of the female socket mounting interface through the connecting screw holes, and are located at the four corners of the female socket mounting interface.

[0017] Furthermore, the extension cable can be detachably connected to the extension cable connection port, and the male plug on the switch cabinet side can be detachably connected to the extension cable.

[0018] Furthermore, the extension cable has a wire diameter of 1.5 mm2, a length of 2 meters, a voltage resistance level of 450 / 750V, and is sheathed with a nylon protective tube on the outside.

[0019] A multifunctional aviation plug extension cord for mechanical property test of a circuit breaker of the present invention is provided with a female plug interface, a mechanical property tester connection port and an extension cord interface integrated on a female plug housing, and the extension cord cable is connected to the male plug on the switch cabinet side, and the electrical connection between them is controlled by a switching switch. The connection method of the multifunctional aviation plug extension cord for mechanical property test of the circuit breaker of the present invention is efficient and convenient, which reduces the encroachment on the time of the entire circuit breaker maintenance construction due to the long time of the mechanical property test of the 10KV circuit breaker, improves the speed of circuit breaker construction, improves the power supply reliability, and optimizes the connection method between the circuit breaker aviation plug and the control line, making the connection of the control line simpler, clearer, safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a multifunctional aviation plug extension cord for circuit breaker mechanical property test of the present invention;

[0021] Figure 2 It is a bottom schematic diagram of a female plug housing 110 of a multifunctional aviation plug extension cord for a circuit breaker mechanical property test of the present invention;

[0022] Figure 3 The present invention is a schematic diagram of the connection of a female socket, a switching switch, a connecting port and an extension cord interface of a multifunctional aviation plug extension cord for a circuit breaker mechanical property test. DETAILED DESCRIPTION

[0023] In order to better understand the technical solution of the present invention, the following is a detailed description through specific embodiments in conjunction with the accompanying drawings:

[0024] See also Figure 1 A multifunctional aviation plug extension cord for a circuit breaker mechanical property test of the present invention comprises a circuit breaker side female plug 100, an extension cord cable 200 and a switch cabinet side male plug 300.

[0025] The female plug on the circuit breaker side is composed of a female plug shell 110, a female socket 121 and an extension cord connector 130. Aviation aluminum is used as the female plug shell material, polycarbonate is used as the internal plug core material, and silver-plated copper is used as the plug core joint material, so that the compressive strength of the female shell is greater than 1000N, and the plug cores are insulated from each other and from the shell. The female plug shell 110 is a square shell structure, and three connectors are opened on its upper surface for connecting the female plug on the circuit breaker side to the mechanical property test device, which are divided into a split connector 111, a negative connector 112, and a close connector 113. The three connectors are engraved with words representing the functions of each connector, and are marked with different colors to distinguish them.

[0026] A switch is provided on the upper surface of the female plug housing adjacent to each connection port. The switch is a four-link switch, including a control switch 114, and a first switch 115, a second switch 116, a third switch 117 and a fourth switch 118 respectively connected to and controlled by the control switch 114. The control switch 114 is provided on the female plug housing, and the characteristic test gear and the relay protection check gear are marked on it. Figure 3 The first switch 115, the second switch 116, the third switch 117 and the fourth switch 118 are respectively connected to the four incoming lines of the female socket 121. When performing the characteristic test, the negative pole of the control line of the characteristic test instrument has only one interface, and the wiring is generally changed manually during the test. In the present invention, the second switch 116 and the fourth switch 118 are short-circuited to each other, eliminating the wiring change operation.

[0027] See also Figure 2 The bottom of the female plug shell is provided with a protruding female socket installation interface 120, and the female socket 121 is installed in the female socket installation interface to connect with the circuit breaker aviation plug, which can be replaced according to the model of the target circuit breaker aviation plug. A docking lock structure 122 is provided on the female socket installation interface, and the docking lock structure 122 wraps the connecting section 123 and the buckle section 124. The end of the connecting section 123 is provided with a connecting screw hole 125. The buckle section 124 and the connecting section 123 form a hook-shaped structure. The four docking lock structures 122 are rotatably arranged on the side wall of the female socket installation interface 120 through the connecting screw holes, and are located at the four corners of the female socket installation interface 120. When the female socket 121 is connected to the circuit breaker aviation plug, the docking lock structure 122 is rotated to limit the connection between the female socket 121 and the circuit breaker aviation plug, so that the connection is tight and not easy to fall off.

[0028] See also Figure 1 The extension cable connector 130 is arranged on the side of the female plug housing 110, the extension cable 200 is detachably connected to the extension cable connector 130, and the male plug 300 on the switch cabinet side is detachably connected to the end of the extension cable 200, making the entire device easy to store. The wire diameter of the extension cable 200 is 1.5mm 2 , length is 2 meters, voltage rating is 450 / 750V, and the outside is covered with a nylon protective tube.

[0029] See also Figure 3 The female socket 121 is electrically connected to the extension cord connection port 130 and the extension cord cable 200 through a switching switch, and its specific circuit structure is: when the control switch 114 is in the characteristic test gear, the first switch 115 is connected to the branch connection port 111, the second switch 116 and the fourth switch 118 are connected to the negative connection port 112, and the third switch 117 is connected to the closing port 113; when the control switch 114 is in the relay protection verification gear, the first switch 115, the second switch 116, the third switch 117 and the fourth switch 118 are respectively connected to the four outgoing lines of the extension cord cable in the extension cord connection port 130.

[0030] Using the multifunctional aviation plug extension cord for circuit breaker mechanical property test of the present invention comprises the following steps:

[0031] Step 1: Plug the 10KV circuit breaker aviation plug into the female socket of the multi-function aviation plug extension cord circuit breaker side female plug. At this time, the control switch is in the relay protection check position.

[0032] Step 2: Plug the male plug on the switch cabinet side into the 10KV switch cabinet aviation plug.

[0033] Step 3: Switch the control switch to the characteristic test position.

[0034] Step 4: Connect the control wires of the characteristic test instrument to the connectors of the female plug on the circuit breaker side.

[0035] Step 5: Close the small control and energy storage switch in the 10KV switch cabinet.

[0036] Step 6: Conduct 10KV circuit breaker mechanical characteristic test.

[0037] Step 7: After the mechanical characteristics test is completed, remove the control line and switch the switch to the relay protection calibration position for subsequent relay protection calibration work.

[0038] Step 8: After the mechanical properties test and relay protection verification are completed, remove the multi-function aviation plug extension cord and store it.

[0039] After using the multifunctional aviation plug extension cord for mechanical characteristic test of a circuit breaker of the present invention to perform a mechanical characteristic test, since there is no need to directly connect the circuit breaker aviation plug to the characteristic test instrument, the efficiency of the mechanical characteristic test of the 10KV circuit breaker is greatly improved. When performing the mechanical characteristic test of the circuit breaker, there is no need to manually release the closing locking coil and manual energy storage, which improves the safety and efficiency of the construction, and at the same time improves the reliability and safety of the test, optimizes the connection method between the circuit breaker aviation plug and the control line, and makes the connection of the control line simpler, clearer, safer and more reliable.

[0040] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A multifunctional aviation plug extension cord for circuit breaker mechanical property test, comprising a circuit breaker side female plug, an extension cord cable and a switch cabinet side male plug, characterized in that: The female plug on the circuit breaker side is composed of a female plug shell, a female socket and an extension cord connection port; the female plug shell is a square shell structure, and three connection ports for connecting the female plug on the circuit breaker side to the mechanical characteristics test device are provided on its upper surface, and a switching switch adjacent to the connection port for connecting the female plug on the circuit breaker side to the mechanical characteristics test device is provided on its upper surface; the female socket is arranged at the bottom of the female plug shell to be connected to the circuit breaker aviation plug; the extension cord connection port is arranged on the side of the female plug shell, the extension cord cable is connected to the extension cord connection port, and the male plug on the switch cabinet side is connected to the end of the extension cord cable; The female socket is electrically connected to the extension cord connector and the extension cord cable through the switch. The switching switch controls the connection relationship between the female socket, the connection port for connecting the female socket on the circuit breaker side with the mechanical property test device, and the extension line connection port by means of internal short circuit, and its specific circuit structure is as follows: The switching switch is a four-linked switch, including a control switch, and a first switch, a second switch, a third switch and a fourth switch respectively connected to the control switch and controlled by the control switch, the control switch is arranged on the female plug housing, the first switch, the second switch, the third switch and the fourth switch are respectively connected to the four incoming lines of the female socket, wherein the second switch and the fourth switch are short-circuited with each other; the connection port for connecting the female plug on the circuit breaker side with the mechanical characteristic test device is divided into a first connection port, a second connection port and a third connection port; When the control switch is in the characteristic test position, the first switch is connected to the first connection port, the second switch and the fourth switch are connected to the second connection port, and the third switch is connected to the third connection port; when the control switch is in the relay protection verification position, the first switch, the second switch, the third switch and the fourth switch are respectively connected to the four outgoing lines of the extension cable in the extension cable connection port.

2. The multifunctional aviation plug extension cord for circuit breaker mechanical characteristic test according to claim 1 is characterized in that: The bottom of the female plug housing is provided with an outwardly protruding female socket installation interface, and the female socket is installed in the female socket installation interface.

3. The multifunctional aviation plug extension cord for circuit breaker mechanical characteristic test according to claim 2 is characterized in that: The female socket mounting interface is provided with a docking lock structure, which wraps the connecting section and the snap section. A connecting screw hole is opened at the end of the connecting section, and the snap section and the connecting section form a hook-type structure. The four docking lock structures are rotatably arranged on the side wall of the female socket mounting interface through the connecting screw holes, and are located at the four corners of the female socket mounting interface.

4. The multifunctional aviation plug extension cord for circuit breaker mechanical characteristic test according to claim 1, characterized in that: The extension cable is detachably connected to the extension cable connection port, and the male plug on the switch cabinet side is detachably connected to the extension cable.

5. The multifunctional aviation plug extension cord for circuit breaker mechanical characteristic test according to claim 1, characterized in that: The extension cable has a wire diameter of 1.5mm, a length of 2 meters, a voltage resistance level of 450 / 750V, and is sheathed with a nylon protective tube on the outside.

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