CN218037209U - Switch device life testing device - Google Patents

Abstract

The utility model provides a switching element life-span testing arrangement, include: the device comprises a switching module, a control module, a fault detection module and an alarm module; a switching module configured to switch a mechanical life test mode in which the control module, the fault detection module, and the alarm module are activated and an electrical life test mode in which the control module, the fault detection module, and the alarm module are deactivated; the control module is configured to control the switching device to execute switching-on action and switching-off action according to a control signal of the controller in the electric service life testing platform; the fault detection module is configured to detect an action execution result of the switching device and send an alarm instruction to the alarm module when the switching device does not successfully execute a closing action or an opening action; and the alarm module is used for sending out an alarm signal according to the alarm instruction. The scheme can improve the efficiency of testing the service life of the switch device.

Description

Switch device life test device

technical field

The application relates to the technical field of electrical engineering, in particular to a device for testing the lifetime of switching devices.

Background technique

For switching devices such as Molded Case Circuit Breaker (MCCB), Air Circuit Breaker (ACB) and Load-Break Switch (LBS), in order to verify whether the service life of the switching device meets the design Requirements, the mechanical life and electrical life of the switching device need to be tested. The purpose of the mechanical life test is to test whether the life of the mechanical components in the switch device meets the design requirements, such as testing whether the contacts are stuck or fall off within the specified opening and closing times. The purpose of electrical life test is to test whether the life of electrical components such as coils in switching devices meets the design requirements, such as testing whether the input and output values of voltage and current are normal within the specified number of opening and closing times.

At present, the mechanical life of the switch device is tested by the mechanical life test platform, and the electrical life of the switch device is tested by the electrical life test platform.

However, the mechanical life test platform can only be used for the test of mechanical life, and the electrical life test platform can only be used for the test of electrical life. Lifetime is less efficient for life testing.

Utility model content

In view of this, the life testing device for switching devices provided in the present application can improve the efficiency of life testing for switching devices.

The embodiment of the present application provides a switching device life testing device, including: a switching module, a control module, a fault detection module and an alarm module; the switching module is configured to switch between the mechanical life test mode and the electrical life test mode, Wherein, in the mechanical life test mode, the control module, the fault detection module and the alarm module are enabled, and the mechanical life test is performed on the switching device based on the electrical life test platform, and in the electrical life test mode, The control module, the fault detection module and the alarm module are deactivated, and the electrical life test platform performs an electrical life test on the switching device; the control module is configured to The control signal controls the switching device to perform the closing action and the opening action; the fault detection module is configured to detect the action execution result of the switching device, and when the switching device fails to perform the closing action or the opening action, send The alarm module sends an alarm instruction; the alarm module is configured to send an alarm signal according to the alarm instruction.

In a possible implementation manner, the fault detection module includes: at least two relays; the coil of each relay in the at least two relays is connected in series with a phase circuit of the switching device; the at least two relays The contact groups of the relays are all connected to the alarm module; when the switching device fails to perform the closing action or the opening action, the contact group of at least one of the at least two relays is closed, and the alarm module Send an alarm command.

In a possible implementation manner, the fault detection module includes: a first relay, a second relay, a third relay, and a fourth relay; the alarm module includes: a fifth relay, a sixth relay, and a buzzer; The control module includes: a first control switch and a second control switch; the coils of the first relay, the second relay, the third relay and the fourth relay are respectively connected to the neutral line output of the switching device end and the output end of the three-phase fire wire; the normally closed contact groups of the first relay, the second relay, the third relay and the fourth relay are connected in parallel to the first control switch connected in series with the coil of the fifth relay; the normally open contact groups of the first relay, the second relay, the third relay and the fourth relay are connected in parallel to the second control switch It is connected in series with the coil of the sixth relay; the normally open contact group of the fifth relay is connected in parallel with the normally open contact group of the sixth relay and then connected in series with the buzzer.

In a possible implementation manner, the switching module includes: a first transfer switch; one end of the first control switch is connected to the positive pole of the external power supply, and the other end of the first control switch is connected to the first The input ends of the first contact group in the transfer switch are connected, and the output ends of the first contact group are respectively connected to the first relay, the second relay, the third relay and the fourth relay The input ends of the normally closed contact group are connected, and the output ends of the normally closed contact groups of the first relay, the second relay, the third relay and the fourth relay are all connected to the fifth relay The input end of the coil is connected; one end of the second control switch is connected to the positive pole of the external power supply, and the other end of the second control switch is connected to the input end of the second contact group in the first transfer switch. connected, the output ends of the second contact group are respectively connected to the input ends of the normally open contact groups of the first relay, the second relay, the third relay and the fourth relay, so The output ends of the normally open contact groups of the first relay, the second relay, the third relay and the fourth relay are connected to the input end of the coil of the sixth relay.

In a possible implementation manner, the fault detection module includes: a seventh relay and an eighth relay; the control module: a ninth relay and a tenth relay; the first relay, the second relay, the The output ends of the normally closed contact groups of the third relay and the fourth relay are connected to the input end of the coil of the seventh relay, and the output end of the coil of the seventh relay is connected to the negative pole of the external power supply. connection; the output ends of the normally open contact groups of the first relay, the second relay, the third relay and the fourth relay are all connected to the input end of the coil of the eighth relay, so The output end of the coil of the eighth relay is connected with the negative pole of the external power supply; one end of the normally closed contact group of the fifth relay is connected with the other end of the first control switch, and the normally closed contact group of the fifth relay is connected with the other end of the first control switch, and the normally closed contact group of the fifth relay is connected The other end of the normally closed contact group of the eighth relay is connected to one end of the normally closed contact group of the eighth relay, and the other end of the normally closed contact group of the eighth relay is connected to the normally closed contact group of the tenth relay The other end of the normally closed contact group of the tenth relay is connected to the input end of the coil of the ninth relay, and the output end of the coil of the ninth relay is connected to the negative pole of the external power supply ; One end of the normally closed contact group of the sixth relay is connected with the other end of the first control switch, and the other end of the normally closed contact group of the sixth relay is connected with the normally closed contact group of the seventh relay One end of the contact group is connected, the other end of the normally closed contact group of the seventh relay is connected with the input end of the coil of the tenth relay, and the output end of the coil of the tenth relay is connected with the external power supply The negative poles are connected; the normally open contact group of the ninth relay is connected in series with the closing coil of the switching device, and the normally open contact group of the tenth relay is connected in series with the opening coil of the switching device.

In a possible implementation manner, one end of the normally open contact group of the seventh relay is connected to the positive pole of the external power supply, and the other end of the normally open contact group of the seventh relay is connected to the first switch The input end of the first contact group in the switch is connected; one end of the normally open contact group of the eighth relay is connected with the positive pole of the external power supply, and the other end of the normally open contact group of the eighth relay is connected with the The input end of the second contact group in the first transfer switch is connected.

In a possible implementation manner, the device further includes: a counting relay; the counting relay is connected to the normally open contact group of the tenth relay; one end of the normally closed contact group of the counting relay is connected to The positive pole of the external power supply is connected, and the other end of the normally closed contact group of the counting relay is respectively connected with one end of the first control switch and one end of the normally open contact group of the seventh relay; The relay is configured to count the number of opening and closing times of the switching device according to the number of times of closing or opening times of the normally open contact group K10 ") of the tenth relay, and when the number of times of opening and closing of the switching device reaches a preset Open the normally closed contact group after the number of times threshold.

In a possible implementation manner, the fault detection module further includes: a second transfer switch; one end of the normally open contact group of the ninth relay is connected to the other end of the normally closed contact group of the counting relay The other end of the normally open contact group of the ninth relay is connected to one end of the second transfer switch, and the other end of the second transfer switch is connected to the normally closed contact group of the eighth relay. One end is connected; when the switching device is a contactor, the second transfer switch is closed, and when the switching device is a circuit breaker, the second transfer switch is opened.

In a possible implementation, the device further includes: a fuse and a start-stop button; one end of the fuse is connected to the positive pole of the external power supply, and the other end of the fuse is connected to one end of the start-stop button , the other end of the start-stop button is respectively connected to one end of the coil of the counting relay and one end of the normally closed contact group of the counting relay, and the other end of the coil of the counting relay is connected to the negative pole of the external power supply connect.

In a possible implementation manner, both the fifth relay and the sixth relay are time relays.

It can be seen from the above technical scheme that the switching module can switch the test mode of the electrical life test platform to the electrical life test mode or the mechanical life test mode. In the electrical life test mode, the control module, the fault detection module and the alarm module are disabled, and the electrical life test The platform can normally test the electrical life of the switching device. In the mechanical life test mode, the control module, fault detection module and alarm module are enabled, and the control module, fault detection module and alarm module can use the electrical life test platform to test the mechanical life of the switch device. test. Through the switch device life test device, the electrical life and mechanical life of the switch device can be tested through the electrical life test platform, thereby saving the time for fixing and wiring the switch device when transferring the switch device between different test platforms, thereby improving Efficiency of life testing of switching devices.

Description of drawings

Fig. 1 is the schematic diagram of the switching device lifetime testing device of an embodiment of the present application;

FIG. 2 is a schematic diagram of a switching device life testing device according to another embodiment of the present application;

Fig. 3 is a schematic diagram of a control circuit of a switching device according to an embodiment of the present application.

List of reference signs:

100: Switching device life test device 101: Switching module 102: Control module

103: Fault detection module 104: Alarm module K1: First relay

K2: Second relay K3: Third relay K4: Fourth relay

K5: Fifth relay K6: Sixth relay K7: Seventh relay

K8: Eighth relay K9: Ninth relay K10: Tenth relay

TP1: First control switch TP2: Second control switch HA: Buzzer

SA1: First transfer switch SA2: Second transfer switch KS: Counting relay

SB: Start-stop button FU: Fuse N: Phase N of switching device

L1: Phase L1 of the switching device L2: Phase L2 of the switching device L3: Phase L3 of the switching device

P1: closing coil P2: opening coil

K1′: Normally closed contact group of the first relay K1″: Normally open contact group of the first relay

K2′: Normally closed contact group of the second relay K2″: Normally open contact group of the second relay

K3′: Normally closed contact group of the third relay K3″: Normally open contact group of the third relay

K4′: Normally closed contact group of the fourth relay K4″: Normally open contact group of the fourth relay

K5′: Normally closed contact group of the fifth relay K5″: Normally open contact group of the fifth relay

K6′: Normally closed contact group of the sixth relay K6″: Normally open contact group of the sixth relay

K7′: Normally closed contact group of the seventh relay K7″: Normally open contact group of the seventh relay

K8′: Normally closed contact group of the eighth relay K8″: Normally open contact group of the eighth relay

K9″: Normally open contact group of the ninth relay K10′: Normally closed contact group of the tenth relay

K10″: The normally open contact group of the tenth relay KS′: The normally closed contact group of the counting device

detailed description

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

In the description of this application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the application.

As mentioned earlier, when performing life tests on switching devices at present, since the mechanical life test platform cannot perform electrical life tests, the electrical life test platform cannot perform mechanical life tests, so it is necessary to test the mechanical life of switching devices through the mechanical life test platform. Carry out the test, and test the electrical life of the switching device through the electrical life test platform. For the same switch device, mechanical life test and electrical life test need to be carried out on two test platforms respectively. To transfer the switch device from one test platform to another test platform for testing, it takes a long time to fix and fix the switch device. wiring, which in turn leads to inefficient life testing of switching devices.

In the embodiment of the present application, the switching device life testing device includes a switching module, through which the mechanical life testing mode and the electrical life testing mode can be switched. In the electrical life testing mode, the electrical life testing platform normally tests the electrical life of the switching Test, in the mechanical life test mode, the control module, fault detection module and alarm module included in the switch device life test device can perform mechanical life test on the switch device based on the electrical life test platform, so that the electrical life test platform can be used for The electrical life test and the mechanical life test of the switching device save the time of fixing and wiring the switching device when transferring the switching device between different test platforms, thereby improving the efficiency of the life test of the switching device. In addition, through the switching device life testing device, the electrical life testing platform can be used to perform electrical life testing and mechanical life testing on the switching devices, thereby improving the utilization power of the electrical life testing platform.

It should be noted that the switching device in the embodiment of the present application refers to a low-voltage (less than 1000V) switching device, which may specifically be a circuit breaker-type switching device, or a contactor-type switching device, such as MCCB, ACB, LBS Or automatic transfer switch (Automatic Transfer Switching Equipment, ATSE), etc.

The switching device life testing device provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a switching device life testing device according to an embodiment of the present application. As shown in FIG. 1 , the switching device life testing device 100 includes: a switching module 101 , a control module 102 , a fault detection module 103 and an alarm module 104 .

The switching module 101 is configured to switch between the mechanical life test mode and the electrical life test mode. In the mechanical life test mode, the control module 102, the fault detection module 103 and the alarm module 104 are activated, and the mechanical life test of the switching device can be performed based on the electrical life test platform. In the electrical life test mode, the control module 102, the fault detection module 103 and the alarm module 104 are disabled, and the electrical life test platform can perform an electrical life test on the switching device. The control module 102 can control the switching device to perform closing action and opening action according to the control signal of the controller in the electrical life test platform. The fault detection module 103 can detect the action execution result of the switching device, and can send an alarm command to the alarm module 104 when the switching device fails to perform the closing action or the opening action. The alarm module 104 sends out an alarm signal after receiving the alarm command, indicating that the mechanical life test of the switching device fails.

The electrical life test platform includes driving mechanisms such as motors, cylinders, and solenoid valves. The driving mechanisms can drive switching devices to perform closing and opening actions. The electrical life test platform also includes a controller, which may be a single-chip microcomputer, a programmable logic controller (Programmable Logic Controller, PLC), a field programmable logic gate array (Field Programmable Gate Array, FPGA) and the like. The controller can send a closing command and an opening command to control the driving mechanism to drive the switching device to perform a closing action or an opening action.

It should be understood that the drive mechanism and controller included in the electrical life test platform are common components for mechanical life test and electrical life test. During the electrical life test, the controller controls the action of the drive mechanism through the control circuit included in the electrical life test platform, and then drives the switching device to perform closing and opening actions, so as to test the electrical life of the switching device. When performing the mechanical life test, the controller controls the action of the driving mechanism through the switching device life testing device 100, and then drives the switching device to perform closing and opening actions, so as to test the mechanical life of the switching device.

In the embodiment of the present application, the switching module 101 can switch the test mode of the electric life test platform to the electric life test mode or the mechanical life test mode, and in the electric life test mode, the control module 102, the fault detection module 103 and the alarm module 104 stop The electric life test platform can normally carry out the electric life test on the switching device. In the mechanical life test mode, the control module 102, the fault detection module 103 and the alarm module 104 are enabled, and the control module 102, the fault detection module 103 and the alarm module 104 can be The electrical life test platform is used to carry out the mechanical life test of the switching device. Through the switch device life testing device 100, the electrical life and mechanical life of the switch device can be tested through the electric life test platform, thereby saving the time for fixing and wiring the switch device when transferring the switch device between different test platforms, thereby being able to Improve the efficiency of life testing of switching devices.

In a possible implementation, the fault detection module 103 includes at least two relays, the coil of each relay is connected in series with a phase circuit in the switching device, and the contact group of each relay is connected with the alarm module 104 . When the switching device fails to perform the closing action or the opening action, the contact group of at least one of the relays is closed to send an alarm command to the alarm module 104, and then the alarm module 104 sends out an alarm signal.

Switching devices include multiple circuits. For example, switching devices used in two-phase power include neutral and live two-phase lines, and switching devices used in three-phase power include one-phase neutral and three-phase live lines. Each phase circuit included in the switching device is connected in series with the coil of a relay. When the switching device fails to perform the closing action or opening action, the coils of each relay cannot be fully energized or de-energized, so that part or all of the relays are triggered. The point group closing sends an alarm command to the alarm module 104, so that the alarm module 104 sends out an alarm signal, indicating that the switching device fails to close or open normally according to the command.

In the embodiment of the present application, when the mechanical life test is performed on the switching device, each phase line of the switching device is connected in series with the coil of a relay. When the switching device fails to perform the closing or opening action, part or all The coil of the relay cannot be energized or de-energized normally, so that part or all of the contact groups of the relay are closed to send an alarm command to the alarm module 104, and the alarm module 104 sends an alarm signal. Through the relay connected in series with each phase line in the switching device to detect whether the switching device successfully performs the closing action or opening action, the life test can be carried out for one-phase, two-phase, three-phase switching devices with different phase numbers to ensure The switching device life testing device 100 has strong applicability.

Fig. 2 is a schematic diagram of a switching device life testing device according to another embodiment of the present application. As shown in Figure 2, the fault detection module includes the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4, the alarm module includes the fifth relay K5, the sixth relay K6 and the buzzer HA, the control module It includes a first control switch TP1 and a second control switch TP2.

The coil of the first relay K1 is connected to the neutral output terminal N of the switching device, the coil of the second relay K2 is connected to the live wire output terminal L1 of the switching device, and the coil of the third relay K3 is connected to the live wire output terminal L2 of the switching device The coil of the fourth relay K4 is connected to the live wire output terminal L3 of the switching device. The normally closed contact group K1' of the first relay K1, the normally closed contact group K2' of the second relay K2, the normally closed contact group K3' of the third relay K3 and the normally closed contact group K4 of the fourth relay K4 ' is connected in parallel, and connected in series with the coil of the first control switch TP1 and the fifth relay K5. The normally open contact group K1 ″ of the first relay K1, the normally open contact group K2 ″ of the second relay K2, the normally open contact group K3 ″ of the third relay K3, and the normally open contact group K4 of the fourth relay K4 After being connected in parallel, it is connected in series with the second control switch TP2 and the coil of the sixth relay K6. The normally open contact group K5 ″ of the fifth relay K5 is connected in parallel with the normally open contact group K6 ″ of the sixth relay K6 and then connected in series with the buzzer HA.

The controller included in the electrical life test platform can send a closing signal or an opening signal to the first control switch TP1 and the second control switch TP2, so that the first control switch TP1 and the second control switch TP2 are closed or opened. While controlling the closing of the first control switch TP1, the controller will also control the driving mechanism included in the electrical life test platform to drive the switching device to perform closing action. While controlling the closing of the second control switch TP2, the controller will also control the driving mechanism Drive the switching device to perform the opening action.

After the controller controls the first control switch TP1 to be closed, if the switching device fails to perform the closing action, the coil of at least one of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 is de-energized , the normally closed contact group of the coil de-energized relay is closed, so that the coil of the fifth relay K5 is energized, and after the coil of the fifth relay K5 is energized, the normally open contact group K5 of the fifth relay K5 is closed, and the fifth relay K5 When the normally open contact group K5″ is closed, the buzzer HA is energized, and after the buzzer HA is energized, an alarm signal is sent, indicating that the switching device has not successfully performed the closing action.

It should be noted that, in each embodiment of the present application, power-off of the coil of the relay means that the coil of the relay is not energized; state, and does not restrict switching between powered-on and powered-off states. The coil of the relay can be switched from energized to de-energized, and at this time, the coil of the relay is switched from the energized state to the non-energized state. A relay's coil remains energized means that the relay's coil remains energized. The coil of the relay remains de-energized means that the coil of the relay remains in a non-energized state.

For example, when the controller controls the first control switch TP1 to be closed, if the N-pole contact in the switching device is not successfully connected, the coil of the first relay K1 is powered off, and the coil of the first relay K1 is normally closed after the power is off. The contact group K1' is closed, the normally closed contact group K1' of the first relay K1 is closed to energize the coil of the fifth relay K5, and the normally open contact group K5" of the fifth relay K5 is closed after the coil of the fifth relay K5 is energized , the normally open contact group K5″ of the fifth relay K5 is closed to energize the buzzer HA, and after the buzzer HA is energized, an alarm signal is sent to indicate that the switching device has not successfully performed the closing action.

After the controller controls the first control switch TP1 to be closed, if the switching device successfully performs the closing action, the coils of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 are all energized, and the first relay K1 The normally closed contact group K1' of the second relay K2, the normally closed contact group K2' of the second relay K3, the normally closed contact group K3' of the third relay K3 and the normally closed contact group K4' of the fourth relay K4 are all disconnected , the coil of the fifth relay K5 is de-energized, the normally open contact group K5 "of the fifth relay K5 is disconnected after the coil of the fifth relay K5 is de-energized, the normally open contact group K5 " of the fifth relay K5 and the sixth relay The normally open contact group K6″ of K6 is all disconnected, so that the buzzer HA is powered off, so the buzzer HA will not send an alarm signal.

After the controller controls the second control switch TP2 to close, if the switching device fails to perform the opening action, the coil of at least one of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 is energized, The normally open contact group of the coil energized relay is closed, so that the coil of the sixth relay K6 is energized. After the coil of the sixth relay K6 is energized, the normally open contact group K6 of the sixth relay K6 is closed, and the normally open contact group of the sixth relay K6 is closed. When the contact group K6″ is closed, the buzzer HA is energized, and after the buzzer HA is energized, it sends out an alarm signal, indicating that the switching device has not successfully performed the opening action.

For example, when the controller controls the second control switch TP2 to close, if the N-pole contact in the switching device fails to be disconnected, the coil of the first relay K1 is energized, and the normally open contact of the first relay K1 is energized. Group K1 "is closed, and the normally open contact group K1" of the first relay K1 is closed to energize the coil of the sixth relay K6. After the coil of the sixth relay K6 is energized, the normally open contact group K6 of the sixth relay K6 is closed. The normally open contact group K6″ of the six relays K6 is closed to energize the buzzer HA. After the buzzer HA is energized, an alarm signal is sent to indicate that the switching device has not successfully performed the opening action.

When the controller controls the second control switch TP2 to be closed, if the switching device successfully performs the opening action, the coils of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 are all powered off, and the first relay The normally open contact group K1 ″ of K1, the normally open contact group K2 ″ of the second relay K2, the normally open contact group K3 ″ of the third relay K3 and the normally open contact group K4 ″ of the fourth relay K4 are all off Open, the coil of the sixth relay K6 is de-energized, the normally open contact group K6 "of the sixth relay K6 is disconnected after the coil of the sixth relay K6 is de-energized, the normally open contact group K5 " of the fifth relay K5 and the sixth The normally open contact group K6″ of the relay K6 is all disconnected, so that the buzzer HA is de-energized, so the buzzer HA will not send an alarm signal.

In the embodiment of the present application, each phase terminal of the switching device is connected in series with a relay, the normally closed contact groups of each relay are connected in parallel and then connected in series with the coil of the fifth relay K5, and the normally open contact groups of each relay are connected in series. After being connected in parallel, it is connected in series with the coil of the sixth relay K6. When the switching device fails to perform the closing action successfully, the coil of at least one relay loses power and the normally closed contact group closes, so that the coil of the fifth relay K5 is energized and normally closed. The open contact group K5" is closed, which then triggers the buzzer HA alarm. When the switching device fails to perform the opening action successfully, the coil of at least one relay is energized and the normally open contact is closed, so that the coil of the sixth relay K6 is The electrical and normally open contact group K6" is closed, and then the buzzer HA is triggered to alarm. Since each phase of the switching device is connected to a relay, if any phase of the switching device fails to be closed or disconnected, the buzzer HA alarm will be triggered, which ensures the accuracy of testing the switching device.

In a possible implementation manner, as shown in FIG. 2 , the switching module 101 may include a first transfer switch SA1.

One end of the first control switch TP1 is connected to the positive pole of the external power supply, the other end of the first control switch TP1 is connected to the input end of the first contact group in the first transfer switch SA1, and the first contact group in the first transfer switch SA1 The output end of the point group is respectively connected with the input end of the normally closed contact group K1' of the first relay K1, the input end of the normally closed contact group K2' of the second relay K2, and the normally closed contact group K3 of the third relay K3 The input end of 'is connected to the input end of the normally closed contact group K4' of the fourth relay K4, the output end of the normally closed contact group K1' of the first relay K1, the normally closed contact group K2 of the second relay K2 ' output end, the output end of the normally closed contact group K3' of the third relay K3 and the output end of the normally closed contact group K4' of the fourth relay K4 are all connected to the input end of the coil of the fifth relay K5, The output end of the coil of the fifth relay K5 is connected with the negative pole of the external power supply.

One end of the second control switch TP2 is connected to the positive pole of the external power supply, the other end of the second control switch TP2 is connected to the input end of the second contact group in the first transfer switch SA1, and the second contact group in the first transfer switch SA1 The output end of the point group is respectively connected with the input end of the normally open contact group K1 "of the first relay K1, the input end of the normally open contact group K2" of the second relay K2, and the normally open contact group K3 of the third relay K3 The input end of "is connected with the input end of the normally open contact group K4 " of the fourth relay K4, the output end of the normally open contact group K1 " of the first relay K1, the normally open contact group K2 of the second relay K2 The output end of ", the output end of the normally open contact group K3 " of the third relay K3 and the output end of the normally open contact group K4 " of the fourth relay K4 are all connected to the input end of the coil of the sixth relay K6, The output end of the coil of the sixth relay K6 is connected to the negative pole of the external power supply.

It should be noted that when testing the mechanical life of the switching device, it is not necessary to connect the switching device to the main circuit, it is only necessary to detect whether the contacts of each phase of the switching device can be separated and contacted normally through a small voltage, so the external The power supply can be a DC power supply with a small voltage, for example, the external power supply is a 24V DC power supply, which ensures the safety of the mechanical life test process.

In the embodiment of the present application, the first transfer switch SA1 and the first control switch TP1 are connected to the external power supply and the normally closed contact group K1' of the first relay K1, the normally closed contact group K2' of the second relay K2, the second relay K2 Between the normally closed contact group K3' of the third relay K3 and the normally closed contact group K4' of the fourth relay K4, and the first transfer switch SA1 and the second control switch TP2 are connected to the external power supply and the normally closed contact group of the first relay K1 Between the open contact group K1 ″, the normally open contact group K2 ″ of the second relay K2, the normally open contact group K3 ″ of the third relay K3, and the normally open contact group K4 ″ of the fourth relay K4, when the first When a transfer switch SA1 is closed, the contact groups of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 can be separated or closed in response to the opening and closing of the switching device, so as to realize the mechanical protection of the switching device. Life is tested, when the first transfer switch SA1 is turned off, the contact groups of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 no longer separate or separate in response to the opening and closing of the switching device Closed, the electrical life test platform can normally test the electrical life of the switch device, so that the mechanical life test and the electrical life test can be switched through the first changeover switch SA1, which improves the utilization rate of the electrical life test platform, and can improve the switch. Efficiency of the device for life testing.

In a possible implementation manner, as shown in FIG. 2 , the fault detection module 103 includes a seventh relay K7 and an eighth relay K8, and the control module 102 includes a ninth relay K9 and a tenth relay K10.

The output terminal of the normally closed contact group K1' of the first relay K1, the output terminal of the normally closed contact group K2' of the second relay K2, the output terminal of the normally closed contact group K3' of the third relay K3 and the fourth The output ends of the normally closed contact group K4' of the relay K4 are all connected to the input end of the coil of the seventh relay K7, and the output end of the coil of the seventh relay K7 is connected to the negative pole of the external power supply. The output terminal of the normally open contact group K1 " of the first relay K1, the output terminal of the normally open contact group K2 " of the second relay K2, the output terminal of the normally open contact group K3 " of the third relay K3 and the fourth The output ends of the normally open contact group K4″ of the relay K4 are all connected to the input end of the coil of the eighth relay K8, and the output end of the coil of the eighth relay K8 is connected to the negative pole of the external power supply.

One end of the normally closed contact group K5' of the fifth relay K5 is connected with the other end of the first control switch TP1, and the other end of the normally closed contact group K5' of the fifth relay K5 is connected with the normally closed contact of the eighth relay K8. One end of the point group K8' is connected, the other end of the normally closed contact group K8' of the eighth relay K8 is connected with one end of the normally closed contact group K10' of the tenth relay K10, and the normally closed contact of the tenth relay K10 The other end of the point group K10' is connected to the input end of the coil of the ninth relay K9, and the output end of the coil of the ninth relay K9 is connected to the negative pole of the external power supply.

One end of the normally closed contact group K6' of the sixth relay K6 is connected to the other end of the second control switch TP2, and the other end of the normally closed contact group K6' of the sixth relay K6 is connected to the normally closed contact of the seventh relay K7. One end of the point group K7' is connected, the other end of the normally closed contact group K7' of the seventh relay K7 is connected with the input end of the coil of the tenth relay K10, and the output end of the coil of the tenth relay K10 is connected with the external power supply connected to the negative pole.

Fig. 3 is a schematic diagram of a control circuit of a switching device according to an embodiment of the present application. As shown in Figure 3, the normally open contact group K9″ of the ninth relay K9 is connected in series with the closing coil P1 of the switching device, and the normally open contact group K10″ of the tenth relay K10 is connected in series with the opening coil P2 of the switching device. in series.

When the switching device is in the opening state, the normally closed contact group K5' of the fifth relay K5, the normally closed contact group K8' of the eighth relay K8 and the normally closed contact group K10' of the tenth relay K10 are all closed, At this time, after the first control switch TP1 is closed, the coil of the ninth relay K9 is energized, so that the normally open contact group K9 "of the ninth relay K9 is closed, and the normally open contact group K9 " of the ninth relay K9 is closed. The closing coil P1 is energized, and the switching device is driven to perform a closing action after the closing coil P1 is energized.

When the switching device is in the closed state, the normally closed contact group K6' of the sixth relay K6 and the normally closed contact group K7' of the seventh relay K7 are all closed. At this time, after the second control switch TP2 is closed, the tenth relay K10 The coil of the tenth relay K10 is energized so that the normally open contact group K10″ of the tenth relay K10 is closed. After the normally open contact group K10″ of the tenth relay K10 is closed, the opening coil P2 of the switching device is energized, and the opening coil P2 is energized to drive the switch The device executes the opening action. After the coil of the tenth relay K10 is energized, the normally closed contact group K10' of the tenth relay K10 is disconnected. state, the coil of the ninth relay K9 is de-energized, so that the normally open contact group K9 "of the ninth relay K9 remains disconnected, and the closing coil P1 is disconnected when the normally open contact group K9 " of the ninth relay K9 is in the disconnected state. Electricity, the closing coil P1 will not drive the switching device to perform the closing action, which realizes the interlock of the ninth relay K9 and the tenth relay K10, and prevents the closing coil P1 and the opening coil P2 from simultaneously driving the switching device to act, thereby causing the switch In the event of device damage, the safety of the switching device life test process is guaranteed.

In the embodiment of the present application, after the switching device fails to perform the closing action, the coil of the seventh relay K7 is energized, so that the normally closed contact group K7' of the seventh relay K7 is disconnected. At this time, if the second control switch TP2 Closed, because the normally closed contact group K7' of the seventh relay K7 is in an open state, the coil of the tenth relay K10 is de-energized, so that the normally open contact group K10 "of the tenth relay K10 remains open, and the tenth relay K10 When the normally open contact group K10″ is in the disconnected state, the opening coil P2 is powered off, and the opening coil P2 will not drive the switching device to perform the opening action. The mechanical life test can be carried out to accurately determine the number of closing actions and opening actions that have been completed before the switching device fails to perform the closing action, so as to ensure the accuracy of the test results.

In the embodiment of the present application, when the switching device fails to perform the opening action, the coil of the eighth relay K8 is energized, so that the normally closed contact group K8' of the eighth relay K8 is disconnected. At this time, if the first control switch TP1 Closed, because the normally closed contact group K8' of the eighth relay K8 is in an open state, the coil of the ninth relay K9 is de-energized, so that the normally open contact group K9 "of the ninth relay K9 remains disconnected, and the ninth relay K9 When the normally open contact group K9″ is in the disconnected state, the closing coil P1 is powered off, and the closing coil P1 will not drive the switching device to perform the closing action. The mechanical life test can be carried out to accurately determine the number of closing actions and the number of opening actions that have been completed before the switching device fails to perform the opening action, so as to ensure the accuracy of the test results.

After the switching device fails to perform the closing action to energize the coil of the fifth relay K5, the normally open contact group K5" of the fifth relay K5 is closed to make the buzzer HA send an alarm signal, and at the same time the normally closed contact of the fifth relay K5 The point group K5' is disconnected. If the first control switch TP1 is closed at this time, since the normally closed contact group K5' of the fifth relay K5 is in the disconnected state, the coil of the ninth relay K9 is de-energized, so that the coil of the ninth relay K9 The normally open contact group K9″ remains disconnected. When the normally open contact group K9″ of the ninth relay K9 is in the disconnected state, the closing coil P1 is powered off, and the closing coil P1 will not drive the switching device to perform the closing action, realizing In order to stop driving the switching device to perform the closing action after the switching device fails to perform the closing action, the mechanical life test is terminated.

After the switching device fails to perform the opening action and energizes the coil of the sixth relay K6, the normally open contact group K5" of the sixth relay K6 is closed to make the buzzer HA send an alarm signal, and at the same time the normally closed contact of the sixth relay K6 The point group K6' is disconnected. If the second control switch TP2 is closed at this time, since the normally closed contact group K6' of the sixth relay K6 is in the disconnected state, the coil of the tenth relay K10 is de-energized, so that the coil of the tenth relay K10 The normally open contact group K10″ remains disconnected, and when the normally open contact group K10″ of the tenth relay K10 is in the disconnected state, the opening coil P2 is powered off, and the opening coil P2 will not drive the switching device to perform the opening action, realizing After the switching device fails to perform the opening action, stop driving the switching device to perform the opening action, so that the mechanical life test is terminated.

In a possible implementation, as shown in Figure 2, one end of the normally open contact group K7" of the seventh relay K7 is connected to the positive pole of the external power supply, and one end of the normally open contact group K7" of the seventh relay K7 The other end is connected to the input end of the first contact group in the first transfer switch SA1. One end of the normally open contact group K8 "of the eighth relay K8 is connected to the positive pole of the external power supply, and the other end of the normally open contact group K8 " of the eighth relay K8 is connected to the second contact group in the first transfer switch SA1 connected to the input.

In the embodiment of the present application, when the switching device fails to perform the closing action, the coil of the seventh relay K7 is energized, so that the normally open contact group K7" of the seventh relay K7 is closed, and the self-locking of the seventh relay K7 is realized. After the normally open contact group K7 " of the seventh relay K7 is closed, no matter whether the first control switch TP1 is closed or disconnected, the coil of the fifth relay K5 will be energized, so that the normally open contact group K5 " of the fifth relay K5 remains In the closed state, the buzzer HA will continue to send an alarm signal to remind the user that the test of the mechanical life of the switch device has terminated. Labor intensity, improve user experience.

In the embodiment of the present application, when the switching device fails to perform the opening action, the coil of the eighth relay K8 is energized, so that the normally open contact group K8" of the eighth relay K8 is closed, and the self-locking of the eighth relay K8 is realized. After the normally open contact group K8 "of the eighth relay K8 is closed, no matter whether the second control switch TP2 is closed or disconnected, the coil of the sixth relay K6 will be energized, so that the normally open contact group K6 " of the sixth relay K6 remains In the closed state, the buzzer HA will continue to send an alarm signal to remind the user that the test of the mechanical life of the switch device has terminated. Labor intensity, improve user experience.

In a possible implementation manner, as shown in FIG. 2 , the switching device life testing device 100 may further include a counting relay KS. The counting relay KS is connected to the normally open contact group K10″ of the tenth relay K10. One end of the normally closed contact group KS′ of the counting relay KS is connected to the positive pole of the external power supply, and the normally closed contact group KS of the counting relay KS The other end of ' is respectively connected with one end of the first control switch TP1 and one end of the normally open contact group K7" of the seventh relay K7. The counting relay KS can count the number of opening and closing times of the switching device according to the number of times of closing or opening times of the normally open contact group K10″ of the tenth relay K10, and after the number of times of opening and closing of the switching device reaches the preset number threshold Open the normally closed contact group KS'.

In the embodiment of the present application, since the normally open contact group K10″ of the tenth relay K10 is closed, the opening coil P2 will be energized, and then the opening coil P2 will drive the switching device to perform the opening action, so the tenth relay K10 The number of closing or opening times of the normally open contact group K10″ is equal to the number of times the switching device performs the closing action or the opening action. The threshold value of the number of times is preset according to the test requirements. After the closing times or breaking times of ″ reach the preset times threshold, the normally closed contact group KS′ of the counting relay KS is disconnected, so that all relays except the counting relay KS are powered off, and the mechanical operation of the switching device is stopped. Life test, at this time, it can be determined that the mechanical life of the switch device is qualified, and the mechanical life test is automatically stopped after the switch device reaches the preset opening and closing times. The test process does not require manual guarding, which can reduce the labor cost of mechanical life testing of the switch device. .

In a possible implementation manner, as shown in FIG. 2 , the fault detection module 103 may further include a second transfer switch SA2. One end of the normally open contact group K9 " of the ninth relay K9 is connected with the other end of the normally closed contact group KS ' of the counting relay KS, and the other end of the normally open contact group K9 " of the ninth relay K9 is connected with the second One end of the changeover switch SA2 is connected, and the other end of the second changeover switch SA2 is connected with one end of the normally closed contact group K8' of the eighth relay K8. In the process of testing the mechanical life of the switching device, if the switching device is a contactor, the second transfer switch SA2 is closed, and if the switching device is a circuit breaker, the second transfer switch SA2 is opened.

In the embodiment of the present application, the closing coil P1 needs to be continuously energized for the contactor to perform the closing action, while the closing coil P1 only needs to be pulsed to be energized when the circuit breaker performs the closing action. During the mechanical life test of the contactor, the second transfer switch SA2 is closed, and when the coil of the ninth relay K9 is energized, the normally open contact group K9″ of the ninth relay K9 is closed, realizing the self-locking of the ninth relay K9 , so that the closing coil P1 can maintain the energized state so that the contactor is in the closed state. When the circuit breaker is tested for mechanical life, the second transfer switch SA2 is opened, and when the first control switch TP1 is closed, the ninth relay K9 The coil is energized, and the closing coil P1 is energized to make the circuit breaker jump to the closing state. When the first control switch TP1 is turned off, the coil of the ninth relay K9 is de-energized, and the closing coil P1 is not energized but the circuit breaker remains closed. state, indicating the energization of the opening coil P2. Visible, by controlling the opening and closing of the second transfer switch SA2, the mechanical life test of the contactor or circuit breaker can be carried out by the switch device life test device 100, which improves the life of the switch device life test device 100. applicability.

It should be noted that when the mechanical life test of the contactor is carried out, when the ninth relay K9 enters the self-locking state and the second control switch TP2 is closed, the coil of the eighth relay K8 is energized to make the normally closed contact group K8′ Disconnect to release the self-locking of the ninth relay K9 to ensure that the test process can be carried out normally.

In a possible implementation manner, as shown in FIG. 2 , the switch device lifetime testing device 100 may further include a fuse FU and a start-stop button SB. One end of the fuse FU is connected to the positive pole of the external power supply, the other end of the fuse FU is connected to one end of the start-stop button SB, and the other end of the start-stop button SB is respectively connected to one end of the coil of the counting relay KS and the normally closed end of the counting relay KS One end of the contact group KS' is connected, and the other end of the coil of the counting relay KS is connected to the negative pole of the external power supply.

In the embodiment of the present application, by setting the fuse FU, when the test circuit included in the switching device life testing device 100 is over-current, the fuse FU is blown to cut off the external power supply, so as to avoid damage to the relays in the switching device life testing device 100 due to over-current , to ensure the safety of the switching device life testing device 100 . By setting the start-stop button SB, when an abnormal situation occurs in the test process, the external power supply can be cut off by the start-stop button SB to ensure the safety of the test process.

In a possible implementation manner, as shown in FIG. 2 , both the fifth relay K5 and the sixth relay K6 are time relays.

In the embodiment of the present application, because the switching device performs the closing action and the opening action have a certain delay, the fifth relay K5 and the sixth relay K6 are both time relays, and the time relay is an action of adding or removing table input After the signal is signaled, the output circuit needs a specified time to generate the contact action relay, that is, the normally open contact group K5″ of the fifth relay K5 will not be closed immediately after the coil of the fifth relay K5 is energized, but will be closed after a certain period of time. After the coil of the six-relay K6 is energized, its normally open contact group K6″ will not be closed immediately, but will be closed after a certain period of time, so as to avoid the buzzer HA when the switching device performs the closing action or opening action. Then the alarm will start to ensure that the test process can be carried out smoothly.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or sequence. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

Finally, it should be noted that: the above are only preferred embodiments of the utility model, and are only used to illustrate the technical solution of the utility model, and are not used to limit the protection scope of the utility model. All modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model are included in the protection scope of the present utility model.

Claims (10)

1. A switch device life tester (100), is characterized in that, comprises: switching module (101), control module (102), fault detection module (103) and alarm module (104); The switching module (101) is configured to switch between a mechanical life test mode and an electrical life test mode, wherein, in the mechanical life test mode, the control module (102), the fault detection module (103 ) and the alarm module (104) are activated, and the mechanical life test is carried out to the switch device based on the electric life test platform, and in the electric life test mode, the control module (102), the fault detection module (103) and The alarm module (104) is deactivated, and the electrical life test platform performs an electrical life test on the switch device; The control module (102) is configured to control the switching device to perform a closing action and an opening action according to a control signal of a controller in the electrical life test platform; The fault detection module (103) is configured to detect an action execution result of the switch device, and send an alarm command to the alarm module (104) when the switch device fails to perform a closing action or an opening action; The alarm module (104) is configured to send out an alarm signal according to the alarm instruction. 2. The device according to claim 1, characterized in that the fault detection module (103) comprises: at least two relays; The coil of each relay in the at least two relays is connected in series with a phase circuit of the switching device; The contact groups of the at least two relays are all connected to the alarm module (104); When the switching device fails to perform the closing action or the opening action, the contact group of at least one of the at least two relays is closed, and an alarm command is sent to the alarm module (104). 3. The device according to claim 2, characterized in that, The fault detection module (103) includes: a first relay (K1), a second relay (K2), a third relay (K3) and a fourth relay (K4); The alarm module (104) includes: a fifth relay (K5), a sixth relay (K6) and a buzzer (HA); The control module (102) includes: a first control switch (TP1) and a second control switch (TP2); The coils of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are respectively connected to the zero line output terminal of the switching device and the three-phase The output terminals of the fire wire are connected; The normally closed contact groups of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are connected in parallel with the first control The switch (TP1) is connected in series with the coil of the fifth relay (K5); The normally open contact groups of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are connected in parallel to the second control The switch (TP2) is connected in series with the coil of the sixth relay (K6); The normally open contact group (K5″) of the fifth relay (K5) is connected in parallel with the normally open contact group (K6″) of the sixth relay (K6) and connected to the buzzer (HA) in series. 4. The device according to claim 3, characterized in that, the switching module (101) comprises: a first transfer switch (SA1); One end of the first control switch (TP1) is connected to the positive pole of the external power supply, and the other end of the first control switch (TP1) is connected to the input end of the first contact group in the first transfer switch (SA1) The output terminals of the first contact group are respectively connected to the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) The input terminals of the normally closed contact group are connected, and the normally closed contacts of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) The output terminals of the contact group are all connected to the input terminals of the coil of the fifth relay (K5); One end of the second control switch (TP2) is connected to the positive pole of the external power supply, and the other end of the second control switch (TP2) is connected to the input end of the second contact group in the first transfer switch (SA1) The output terminals of the second contact group are respectively connected to the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) The input terminals of the normally open contact group are connected, and the normally open contacts of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) The output end of the contact group is connected with the input end of the coil of the sixth relay (K6). 5. The device according to claim 4, characterized in that, The fault detection module (103) includes: a seventh relay (K7) and an eighth relay (K8); The control module (102): a ninth relay (K9) and a tenth relay (K10); The output terminals of the normally closed contact groups of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are all connected to the seventh The input end of the coil of the relay (K7) is connected, and the output end of the coil of the seventh relay (K7) is connected with the negative pole of the external power supply; The output terminals of the normally open contact groups of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are all connected to the eighth The input end of the coil of the relay (K8) is connected, and the output end of the coil of the eighth relay (K8) is connected with the negative pole of the external power supply; One end of the normally closed contact group (K5') of the fifth relay (K5) is connected to the other end of the first control switch (TP1), and the normally closed contact group of the fifth relay (K5) The other end of (K5') is connected with one end of the normally closed contact group (K8') of the eighth relay (K8), and the normally closed contact group (K8') of the eighth relay (K8) The other end is connected to one end of the normally closed contact group (K10') of the tenth relay (K10), and the other end of the normally closed contact group (K10') of the tenth relay (K10) is connected to the The input end of the coil of the ninth relay (K9) is connected, and the output end of the coil of the ninth relay (K9) is connected with the negative pole of the external power supply; One end of the normally closed contact group (K6') of the sixth relay (K6) is connected to the other end of the first control switch (TP1), and the normally closed contact group of the sixth relay (K6) The other end of (K6') is connected with one end of the normally closed contact group (K7') of the seventh relay (K7), and the normally closed contact group (K7') of the seventh relay (K7) The other end is connected to the input end of the coil of the tenth relay (K10), and the output end of the coil of the tenth relay (K10) is connected to the negative pole of the external power supply; The normally open contact group (K9″) of the ninth relay (K9) is connected in series with the closing coil (P1) of the switching device, and the normally open contact group (K10″) of the tenth relay (K10) is connected with The opening coil (P2) of the switching device is connected in series. 6. The device according to claim 5, characterized in that, One end of the normally open contact group (K7 ″) of the seventh relay (K7) is connected to the positive pole of the external power supply, and the other end of the normally open contact group (K7 ″) of the seventh relay (K7) is connected to the positive pole of the external power supply. The input terminals of the first contact group in the first transfer switch (SA1) are connected; One end of the normally open contact group (K8 ″) of the eighth relay (K8) is connected to the positive pole of the external power supply, and the other end of the normally open contact group (K8 ″) of the eighth relay (K8) is connected to the positive pole of the external power supply. The input terminals of the second contact group in the first transfer switch (SA1) are connected together. 7. The device according to claim 5, characterized in that, the device further comprises: a counting relay (KS); The counting relay (KS) is connected to the normally open contact group (K10″) of the tenth relay (K10); One end of the normally closed contact group (KS') of the counting relay (KS) is connected to the positive pole of the external power supply, and the other end of the normally closed contact group (KS') of the counting relay (KS) is respectively connected to the positive pole of the external power supply. One end of the first control switch (TP1) is connected to one end of the normally open contact group (K7″) of the seventh relay (K7); The counting relay (KS) is configured to count the number of opening and closing times of the switching device according to the number of times of closing or opening times of the normally open contact group K10″) of the tenth relay (K10), and The normally closed contact group (KS') is disconnected after the opening and closing times of the device reach a preset threshold. 8. The device according to claim 7, characterized in that, the fault detection module (103) further comprises: a second transfer switch (SA2); One end of the normally open contact group (K9″) of the ninth relay (K9) is connected to the other end of the normally closed contact group (KS′) of the counting relay (KS), and the ninth relay ( The other end of the normally open contact group (K9″) of K9) is connected to one end of the second transfer switch (SA2), and the other end of the second transfer switch (SA2) is connected to the eighth relay (K8 ) is connected to one end of the normally closed contact group (K8'); When the switch device is a contactor, the second transfer switch (SA2) is closed, and when the switch device is a circuit breaker, the second transfer switch (SA2) is opened. 9. The device according to claim 7, characterized in that the device further comprises: a fuse (FU) and a start-stop button (SB); One end of the fuse (FU) is connected to the positive pole of the external power supply, the other end of the fuse (FU) is connected to one end of the start-stop button (SB), and the other end of the start-stop button (SB) One end of the coil of the counting relay (KS) and one end of the normally closed contact group (KS') of the counting relay (KS) are respectively connected, and the other end of the coil of the counting relay (KS) is connected to the external Connect to the negative pole of the power supply. 10. The device according to any one of claims 3-9, characterized in that, both the fifth relay (K5) and the sixth relay (K6) are time relays.

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