Switch test circuit and device

Abstract

The utility model provides a switch test circuit and device. The switch test circuit comprises an input port, a leakage protector, a first fuse, a contactor contact switch, a transformer and a second fuse. The output end of the input port is sequentially connected with the leakage protector, the normally open contact switch, the transformer and the output port in series; a first fuse is connected in series between the leakage protector and the normally open contact switch; a second fuse is arranged between the transformer and the output port; and a control circuit is connected in parallel between the first fuse and the contactor contact switch. During use, a secondary test wire of a transformer of tested equipment is removed and connected with an output port, so that the equipment can be comprehensively detected by using safety voltage, including closing, opening, near and remote control, short circuit test, electric leakage test, comprehensive protector test, parameter modification, power-on test of part of components and maintenance of a control circuit. Through the switch test circuit, maintenance difficulty and time can be reduced, and personal and equipment safety can be guaranteed.

Description

Technical Field

[0001] This application relates to the field of electrical testing safety technology in coal mines, specifically to a switch testing circuit and device. Background Technology

[0002] During the maintenance and repair of the explosion-proof and intrinsically safe vacuum electromagnetic starter for mining, it is necessary to pass an AC660V three-phase power supply test. Only after the AC660V three-phase power supply test is passed can it be used underground.

[0003] However, due to the harsh working environment underground, the bumps and vibrations during transportation, and other uncertainties, energizing tests carry significant risks. They require extensive observation and testing before the actual electrical test, which is time-consuming and labor-intensive. Furthermore, due to the special nature of some electrical components, their condition cannot be determined without power, causing considerable inconvenience for maintenance and repair. Forcibly energizing them could not only worsen equipment damage but also endanger personal safety. Electrical tests require two people working together: one to work and one to monitor. Certain safety hazards exist when measuring main line voltage under live conditions, checking disconnector phase switching, and addressing issues such as vacuum contactor adhesion. Utility Model Content

[0004] This application provides a switch test circuit and device to solve the problem of significant safety hazards during the power-on test of a mine explosion-proof and intrinsically safe vacuum electromagnetic starter.

[0005] In a first aspect, this application provides a switch test circuit, comprising:

[0006] Input port, residual current device (RCD), first fuse, contactor contact switch, transformer, second fuse, output port;

[0007] The input port is provided with a first input terminal and a second input terminal. The first input terminal is used to connect to the live wire, and the second input terminal is used to connect to the neutral wire.

[0008] The output terminal of the input port is connected in series with the leakage current protector, the contactor contact switch, the transformer, and the output port in sequence.

[0009] The first fuse is connected in series between the leakage current protector and the contactor contact switch;

[0010] A second fuse is provided between the transformer and the output port;

[0011] A control circuit is also connected in parallel between the first fuse and the contactor contact switch. The control circuit is used to control the opening or closing of the contactor contact switch.

[0012] Optionally, a first voltmeter is connected in parallel between the contactor contact switch and the transformer; the first voltmeter is connected in parallel with an input voltage indicator light.

[0013] Optionally, a second voltmeter is connected in parallel between the transformer and the output port, and the second voltmeter is connected in parallel with an output voltage indicator light.

[0014] Optionally, the control circuit includes a first normally closed contact switch, a second normally closed contact switch, a normally open contact switch, and an AC contactor;

[0015] The first normally closed contact switch, the second normally closed contact switch, the normally open contact switch, and the AC contactor are connected in series.

[0016] Optionally, the control circuit further includes a power indicator light, one end of which is connected to the input terminal of the second normally closed contact switch, and the other end of which is connected to the output terminal of the AC contactor.

[0017] Optionally, the control circuit further includes a single-pole single-throw switch, which is connected in parallel with the normally open contact switch.

[0018] Optionally, the transformer includes a primary coil and a secondary coil, which are used to transform 220V AC power into 36V AC power.

[0019] In a second aspect, this application provides a switch testing device, comprising: the switch testing circuit and the enclosure described in the first aspect above;

[0020] One side of the box is connected to a door via a hinge;

[0021] The cabinet door is equipped with a viewing window;

[0022] The enclosure is equipped with a protective door, which is equipped with a power indicator light, an input voltage indicator light, an output voltage indicator light, a start button, a stop button, and an emergency stop button.

[0023] The start button is used to control the normally open contact switch to close;

[0024] The stop button is used to control the second normally closed contact switch to open;

[0025] The emergency stop button is used to control the first normally closed contact switch to open.

[0026] The switch test circuit is housed inside the enclosure.

[0027] As can be seen from the above technical solutions, this application provides a switch test circuit and device. The switch test circuit includes: an input port, a leakage current protector, a first fuse, a contactor contact switch, a transformer, a second fuse, and an output port. The input port is provided with a first input terminal and a second input terminal. The first input terminal is used to connect to the live wire, and the second input terminal is used to connect to the neutral wire. The output terminal of the input port is connected in series with the leakage current protector, the contactor contact switch, the transformer, and the output port in sequence. The first fuse is connected in series between the leakage current protector and the contactor contact switch. The second fuse is provided between the transformer and the output port. A control circuit is also connected in parallel between the first fuse and the contactor contact switch. The control circuit is used to control the opening or closing of the contactor contact switch. When in use, disconnect the secondary test wiring of the transformer of the equipment under test from the output port, and then use a safe voltage to perform comprehensive testing on the equipment, including closing, opening, near and remote control, short circuit test, leakage test, integrated protection device test, parameter modification, power-on test of some components, and maintenance of control circuit. The switch test circuit can reduce the difficulty and time of maintenance, and ensure the safety of personnel and equipment. Attached Figure Description

[0028] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A switch test circuit diagram provided for an embodiment of this application;

[0031] Figure 2 This is a structural diagram of the switch testing device provided in an embodiment of this application.

[0032] Figure label:

[0033] The components are as follows: 1-Enclosure; 2-Enclosure door; 3-Viewing window; 4-Safety door; 5-Power indicator light; 6-Input voltage indicator light; 7-Output voltage indicator light; 8-Start button; 9-Stop button; 10-Emergency stop button; IN-Input port; OF-Residual current device (RCD); FU1-First fuse; FU2-Second fuse; KM1-Contactor contact switch; KM2-AC contactor; KM3-Single-pole single-throw switch; SB1-First normally closed contact switch; SB2-Second normally closed contact switch; SB3-Normally open contact switch; L1-Input voltage indicator light; L2-Output voltage indicator light; L3-Power indicator light; V1-First voltmeter; V2-Second voltmeter; OUT-Output port; T-Transformer. Detailed Implementation

[0034] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0035] During the maintenance and repair of the explosion-proof and intrinsically safe vacuum electromagnetic starter for mining, it is necessary to pass an AC660V three-phase power supply test. Only after the AC660V three-phase power supply test is passed can it be used underground.

[0036] However, due to the harsh working environment underground, the bumps and vibrations during transportation, and other uncertainties, energizing tests carry significant risks. They require extensive observation and testing before the actual electrical test, which is time-consuming and labor-intensive. Furthermore, due to the special nature of some electrical components, their condition cannot be determined without power, causing considerable inconvenience for maintenance and repair. Forcibly energizing them could not only worsen equipment damage but also endanger personal safety. Electrical tests require two people working together: one to work and one to monitor. Certain safety hazards exist when measuring main line voltage under live conditions, checking disconnector phase switching, and addressing issues such as vacuum contactor adhesion.

[0037] To address the significant safety hazards during energization testing of explosion-proof and intrinsically safe vacuum electromagnetic starters used in mines, see [reference needed]. Figure 1 This application provides a switch test circuit in some embodiments, including:

[0038] Input port IN, leakage current protector OF, first fuse FU1, contactor contact switch KM1, transformer T, second fuse FU2, output port OUT.

[0039] The input port IN is used to connect to an external power supply and introduce current for the switching test circuit.

[0040] The residual current device (RCD) can detect leakage current in the circuit. When the RCD detects leakage current in the test circuit, it will automatically cut off the power supply to ensure safety.

[0041] Both the first fuse FU1 and the second fuse FU2 are current fuses. When an overload or short circuit occurs in the circuit, they melt themselves to cut off the circuit and prevent equipment damage and fire.

[0042] The transformer T can adjust the input voltage to a suitable voltage level for testing, while providing electrical isolation to increase safety. In this application, the transformer T includes a primary coil and a secondary coil, which can transform 220V AC to 36V AC.

[0043] The output port OUT is used to transmit the processed electrical energy from the transformer T to the required location, such as a motor or other electrical equipment, for energization testing. In this embodiment, the output port OUT is connected to a mine-use explosion-proof and intrinsically safe vacuum electromagnetic starter, enabling the starter to undergo energization testing, thereby improving the safety of the energization test.

[0044] The control circuit is used to control the opening and closing of contactor contact switch KM1, achieving precise control and management of the entire test process. When the control circuit is connected, the AC contactor KM2 in the control circuit generates a magnetic field, which can control the contactor contact switch KM1 to close. When the control circuit is disconnected, the AC contactor KM2 cannot generate a magnetic field, thus causing the contactor contact switch KM1 to open.

[0045] The input port IN is equipped with a first input terminal and a second input terminal. The first input terminal is used to connect to the live wire, and the second input terminal is used to connect to the neutral wire.

[0046] The output terminal of the input port IN is connected in series with the residual current device OF, the contactor contact switch KM1, the transformer T, and the output port in sequence.

[0047] A first fuse FU1 is connected in series between the residual current device OF and the contactor contact switch KM1.

[0048] A second fuse FU2 is installed between the transformer T and the output port OUT.

[0049] A control circuit is also connected in parallel between the first fuse FU1 and the contactor contact switch KM1. The control circuit is used to control the opening or closing of the contactor contact switch KM1.

[0050] Specifically, when the switch test circuit is connected to an external power supply, the live wire of the three-phase AC power can be connected to the first input terminal, and the neutral wire of the three-phase AC power can be connected to the second input terminal. When the contactor contact switch KM1 is closed, the current flows through the leakage current protector OF, the first fuse FU1, and the contactor contact switch KM1 to the primary coil of the transformer T, and from the secondary coil of the transformer T through the second fuse FU2 to the output port OUT. The leakage current protector OF and the first fuse FU1 and the second fuse FU2 can effectively detect leakage, short circuit, and overload faults, improving the safety of the mine explosion-proof and intrinsically safe vacuum electromagnetic starter during power-on testing.

[0051] In some embodiments, a first voltmeter V1 is connected in parallel between the contactor contact switch KM1 and the transformer T; an input voltage indicator L1 is connected in parallel between the first voltmeter V1 and the output port OUT. A second voltmeter V2 is also connected in parallel between the transformer T and the output port OUT, and an output voltage indicator L2 is connected in parallel between the second voltmeter V2 and the output port OUT.

[0052] The first voltmeter V1 detects the voltage on the input side, and the second voltmeter V2 detects the voltage on the output side. By setting input voltage indicator L1 and output voltage indicator L2, the operating status of the input and output sides of the switch detection circuit can be observed more intuitively. That is, the staff can directly observe whether there is a fault on the input and output sides of the circuit based on the input voltage indicator L1 and output voltage indicator L2. For example, when both input voltage indicator L1 and output voltage indicator L2 are off, there is a fault on the input and output sides of the surface switch detection circuit. When input voltage indicator L1 is on and output voltage indicator L2 is off, the input side of the surface switch detection circuit is normal, but the output side is faulty.

[0053] In some embodiments, the control circuit includes a first normally closed contact switch SB1, a second normally closed contact switch SB2, a normally open contact switch SB3, and an AC contactor KM2; the first normally closed contact switch SB1, the second normally closed contact switch SB2, the normally open contact switch SB3, and the AC contactor KM2 are connected in series.

[0054] In this circuit, the first normally closed contact switch SB1 and the second normally closed contact switch SB2 remain closed when no control signal is applied. When it is necessary to open the first normally closed contact switch SB1 and the second normally closed contact switch SB2, an external control signal can be used to open them, thereby stopping the flow of current.

[0055] The contactor switch KM1 is in the open state when no control signal is applied. When it is necessary to close the circuit, an external control signal is used to close it, thereby allowing current to flow.

[0056] In this embodiment of the application, applying control signals to the first normally closed contact switch SB1, the second normally closed contact switch SB2, and the normally open contact switch SB3 can be achieved by adding control buttons to each of the three switches individually. When an operator presses a button, the state of the contact switch can be changed.

[0057] The AC contactor KM2 is mainly used to control the closing of the normally open contact switch SB3. When the coil in the AC contactor KM2 is energized, it generates a magnetic field. This magnetic field causes the iron core inside the contactor to generate an attractive force, thereby controlling the contactor contact switch KM1 to close. In this application, the first normally closed contact switch SB1 and the second normally closed contact switch SB2 are in the closed state. When a control signal is applied to close the normally open contact switch SB3, the control circuit is activated, energizing the coil of the AC contactor KM2. This, in turn, controls the contactor contact switch KM1 to close, thus activating the switch test circuit. When the switch test circuit needs to be disconnected, a control signal can be applied to close the second normally closed contact switch SB2. This disconnects the control circuit, and the coil of the AC contactor KM2 is not energized, unable to generate a magnetic field. Therefore, the contactor contact switch KM1 is disconnected, and the switch test circuit is disconnected.

[0058] The control circuit also includes a power indicator light L3. One end of the power indicator light is connected to the input terminal of the second normally closed contact switch SB2, and the other end of the power indicator light L3 is connected to the output terminal of the AC contactor KM2. The power indicator light L3 can indicate to the operator whether the test circuit is in the off or on state.

[0059] When the operator controls the switch test circuit to disconnect via the second normally closed contact switch SB2, the power indicator L3 will be lit, indicating a fault in the switch test circuit. At this time, a control signal can be applied to control the first normally closed contact switch SB1 to disconnect, thereby completely disconnecting the control circuit and causing the contactor contact switch KM1 to disconnect.

[0060] In some embodiments, the control circuit further includes a single-pole single-throw switch KM3, which is connected in parallel with a normally open contact switch SB3. The parallel connection of the normally open contact switch SB3 and the single-pole single-throw switch KM3 ensures that if one switch fails or is damaged, the other switch can still operate normally, guaranteeing the reliability and stability of the control circuit. Simultaneously, the switches generate heat when a large current flows. Connecting the two switches in parallel disperses the current, reducing the heat generated by each switch, which helps extend the switch's lifespan, improves the reliability and stability of the control circuit, and also reduces the risk of circuit failure due to overheating.

[0061] In some embodiments, such as Figure 2As shown in the figure, this application provides a switch test device, including: the switch test circuit and the housing 1 provided in the above embodiment.

[0062] A door 2 is rotatably connected to one side of the box body 1 via a hinge.

[0063] The box door 2 is equipped with a viewing window 3.

[0064] The enclosure 1 is equipped with a protective door 4, and the protective door 4 is equipped with a power indicator light 5, an input voltage indicator light 6, an output voltage indicator light 7, a start button 8, a stop button 9, and an emergency stop button 10.

[0065] The start button 8 is used to control the normally open contact switch SB3 to close.

[0066] Stop button 9 is used to control the second normally closed contact switch SB2 to open.

[0067] Emergency stop button 10 is used to control the first normally closed contact switch SB1 to open.

[0068] The switch test circuit is located inside enclosure 1.

[0069] It is understandable that power indicator 5 is the power indicator L3 in the switch test circuit; input voltage indicator 6 is the input voltage indicator L1 in the switch test circuit; and output voltage indicator 7 is the output voltage indicator L2 in the switch test circuit.

[0070] As can be seen from the above technical solutions, this application provides a switch test circuit and device. The switch test circuit includes: an input port IN, a residual current device (RCD) OF, a first fuse FU1, a contactor contact switch KM1, a transformer T, a second fuse FU2, and an output port OUT. The input port IN is provided with a first input terminal and a second input terminal. The first input terminal is used to connect to the live wire, and the second input terminal is used to connect to the neutral wire. The output terminal of the input port IN is connected in series with the RCD OF, the contactor contact switch KM1, the transformer T, and the output port. The first fuse FU1 is connected in series between the RCD OF and the contactor contact switch KM1. The second fuse FU2 is provided between the transformer T and the output port OUT. A control circuit is also connected in parallel between the first fuse FU1 and the contactor contact switch KM1. The control circuit is used to control the opening or closing of the contactor contact switch KM1. When in use, disconnect the secondary test wiring of the transformer T of the equipment under test and connect it to the output port OUT. Then, a safe voltage can be used to perform comprehensive testing on the equipment, including closing, opening, near and remote control, short circuit test, leakage test, integrated protection device test, parameter modification, power-on test of some components, and maintenance of control circuit. The switch test circuit can reduce the difficulty and time of maintenance and ensure the safety of personnel and equipment.

[0071] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A switching test circuit, characterized by comprising: The switch test circuit comprises an input port, a leakage protector, a first fuse, a contactor contact switch, a transformer, a second fuse and an output port. The input port is provided with a first input terminal and a second input terminal, the first input terminal is used for being connected with a live wire, and the second input terminal is used for being connected with a zero line. The output end of the input port is sequentially connected with the leakage protector, the contactor contact switch, the transformer and the output port in series. The first fuse is connected in series between the leakage protector and the contactor contact switch. The second fuse is arranged between the transformer and the output port. A control circuit is further connected in parallel between the first fuse and the contactor contact switch, and the control circuit is used for controlling the opening or closing of the contactor contact switch. A first voltmeter is further connected in parallel between the contactor contact switch and the transformer, and the first voltmeter is connected in parallel with an input voltage indicating lamp.

2. The switching test circuit of claim 1, wherein A second voltmeter is further connected in parallel between the transformer and the output port, and the second voltmeter is connected in parallel with an output voltage indicating lamp.

3. The switching test circuit of claim 1, wherein The control circuit comprises a first normally closed contact switch, a second normally closed contact switch, a normally open contact switch and an alternating current contactor.

4. The switching test circuit of claim 1, wherein The first normally closed contact switch, the second normally closed contact switch, the normally open contact switch and the alternating current contactor are sequentially connected in series. The control circuit further comprises a power supply indicating lamp, one end of the power supply indicating lamp is connected with an input end of the second normally closed contact switch, and the other end of the power supply indicating lamp is connected with an output end of the alternating current contactor.

5. The switching test circuit of claim 4, wherein, The control circuit further comprises a single-pole single-throw switch, and the single-pole single-throw switch is connected in parallel with the normally open contact switch.

6. The switching test circuit of claim 4, wherein, The transformer comprises a primary coil and a secondary coil, and the primary coil and the secondary coil are used for transforming 220V alternating current into 36V alternating current.

7. The switching test circuit of claim 1, wherein The switch test circuit and the box body according to any one of claims 1-7 are provided.

8. A switching test device, characterized by One side of the box body is rotatably connected with a box door through a hinge. The box door is provided with a viewing window. The box body is provided with a protection door, and the protection door is provided with a power supply indicating lamp, an input voltage indicating lamp, an output voltage indicating lamp, a start button, a stop button and an emergency stop button. The start button is used for controlling the closing of the normally open contact switch. The stop button is used for controlling the opening of the second normally closed contact switch. The emergency stop button is used for controlling the opening of the first normally closed contact switch. The switch test circuit is arranged in the box body. ​ ​

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