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 testing device

Technical Field

The application relates to the technical field of electrical engineering, in particular to a service life testing device for a switch device.

Background

For switching devices such as a plastic Case Circuit Breaker (MCCB), an Air Circuit Breaker (ACB), and a Load-Break Switch (LBS), in order to verify whether the service life of the switching device satisfies the design requirements, it is necessary to test the mechanical life and the electrical life of the switching device. The purpose of the mechanical life test is to test whether the life of a mechanical component in the switching device meets design requirements, such as whether a contact is stuck, falls off, and the like within a specified opening and closing number. The purpose of the electrical life test is to test whether the life of electrical components such as coils in the switching devices meets design requirements, such as whether input and output values of voltage and current are normal within a specified switching number.

At present, the mechanical life of a switching device is tested by a mechanical life testing platform, and the electrical life of the switching device is tested by an electrical life testing platform.

However, the mechanical life testing platform can only be used for testing the mechanical life, and the electrical life testing platform can only be used for testing the electrical life, which requires testing the mechanical life and the electrical life of the switch device on the two testing platforms in sequence, resulting in low efficiency of testing the service life of the switch device.

SUMMERY OF THE UTILITY MODEL

In view of this, the device for testing the service life of the switching device provided by the application can improve the efficiency of testing the service life of the switching device.

The embodiment of the application provides a switching device life-span testing arrangement, includes: the device comprises a switching module, a control module, a fault detection module and an alarm module; the switching module 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, the fault detection module and the alarm module are activated, and a mechanical life test is performed on the switching device based on an 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 control a switching device to perform switching-on and switching-off actions according to a control signal of the controller in the electrical 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 switching-on action or a switching-off action; and the alarm module is used for sending out an alarm signal according to the alarm instruction.

In one possible implementation, the fault detection module includes: at least two relays; the coil of each relay of the at least two relays is connected with the one-phase circuit of the switching device in series; the contact sets of the at least two relays are connected with the alarm module; when the switching device does not successfully execute a switching-on action or a switching-off action, the contact group of at least one relay in the at least two relays is closed, and an alarm instruction is sent to the alarm module.

In one possible implementation, 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 with the output end of a zero line and the output end of a three-phase live wire of a switching device; the normally closed contact groups of the first relay, the second relay, the third relay and the fourth relay are connected in parallel and then are connected in series with the coils of the first control switch and the fifth relay; the normally open contact sets of the first relay, the second relay, the third relay and the fourth relay are connected in parallel and then are connected in series with the coils of the second control switch and the sixth relay; and the normally open contact group of the fifth relay is connected with the normally open contact group of the sixth relay in parallel and then is connected with the buzzer in series.

In one possible implementation, the switching module includes: a first changeover switch; one end of the first control switch is connected with the anode of an external power supply, the other end of the first control switch is connected with the input end of a first contact group in the first transfer switch, the output end of the first contact group is respectively connected with the input ends of normally closed contact groups of the first relay, the second relay, the third relay and the fourth relay, 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 with the input end of a coil of the fifth relay; one end of the second control switch is connected with the anode of an external power supply, the other end of the second control switch is connected with the input end of a second contact group in the first transfer switch, the output end of the second contact group is respectively connected with the input end of a normally open contact group of the first relay, the second relay, the third relay and the fourth relay, and the output end of the normally open contact group of the first relay, the second relay, the third relay and the fourth relay is connected with the input end of a coil of the sixth relay.

In one possible implementation, the fault detection module includes: a seventh relay and an eighth relay; the control module: a ninth relay and a tenth relay; 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 with the input end of a coil of a seventh relay, and the output end of the coil of the seventh relay is connected with the negative electrode of an external power supply; the output ends of the normally open contact sets of the first relay, the second relay, the third relay and the fourth relay are all connected with the input end of a coil of the eighth relay, and the output end of the coil of the eighth relay is connected with the negative electrode of an external power supply; one end of a normally closed contact group of the fifth relay is connected with the other end of the first control switch, the other end of the normally closed contact group of the fifth relay is connected with one end of a normally closed contact group of the eighth relay, the other end of the normally closed contact group of the eighth relay is connected with one end of a normally closed contact group of the tenth relay, the other end of the normally closed contact group of the tenth relay is connected with an input end of a coil of the ninth relay, and an output end of the coil of the ninth relay is connected with a negative electrode of an external power supply; one end of a normally closed contact group of the sixth relay is connected with the other end of the first control switch, the other end of the normally closed contact group of the sixth relay is connected with one end of a normally closed contact group of the seventh relay, the other end of the normally closed contact group of the seventh relay is connected with the input end of a coil of the tenth relay, and the output end of the coil of the tenth relay is connected with the negative electrode of an external power supply; and the normally open contact group of the ninth relay is connected with a closing coil of the switch device in series, and the normally open contact group of the tenth relay is connected with a separating coil of the switch device in series.

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

In one possible implementation, the apparatus further includes: a counting relay; the counting relay is connected with the normally open contact group of the tenth relay; one end of a normally closed contact group of the counting relay is connected with the positive electrode of an external power supply, 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 a normally open contact group of the seventh relay; and the counting relay is configured to count the opening and closing times of the switching device according to the closing times or the opening times of the normally-open contact group K10') of the tenth relay, and open the normally-closed contact group after the opening and closing times of the switching device reach a preset time threshold value.

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

In one possible implementation, the apparatus further includes: a fuse and a start-stop button; one end of the fuse is connected with the anode of an external power supply, the other end of the fuse is connected with one end of the start-stop button, the other end of the start-stop button is respectively connected with one end of a coil of the counting relay and one end of a normally closed contact group of the counting relay, and the other end of the coil of the counting relay is connected with the cathode of the external power supply.

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

According to the technical scheme, the switching module can switch the test mode of the electric service life test platform to the electric service life test mode or the mechanical service life test mode, the control module, the fault detection module and the alarm module are not used in the electric service life test mode, the electric service life test platform can normally carry out electric service life test on the switch device, the control module, the fault detection module and the alarm module are started in the mechanical service life test mode, and the control module, the fault detection module and the alarm module can carry out mechanical service life test on the switch device by using the electric service life test platform. Through switching element life-span testing arrangement, can test switching element's electric life and mechanical life through electric life test platform to save the time of fixing and working a telephone switchboard to switching element when shifting switching element between different test platforms, thereby can improve the efficiency of carrying out the life-span test to switching element.

Drawings

Fig. 1 is a schematic view of a life test apparatus for a switching device according to an embodiment of the present application;

fig. 2 is a schematic view of a life test apparatus for a switching device according to another embodiment of the present application;

FIG. 3 is a schematic diagram of a control circuit for a switching device according to one embodiment of the present application.

List of reference numerals:

100: switching device life test apparatus 101: the switching module 102: control module

103: the fault detection module 104: the alarm module K1: first relay

K2: second relay K3: the third relay K4: fourth relay

K5: fifth relay K6: sixth relay K7: seventh relay

K8: eighth relay K9: ninth relay K10: tenth relay

TP1: the first control switch TP2: the second control switch HA: buzzer

SA1: first changeover switch SA2: second changeover switch KS: counting relay

SB: start and stop button FU: a fuse N: n-phase of switching device

L1: l1 phase L2 of the switching device: l2 phase L3 of switching device: l3 phase of switching device

P1: closing coil P2: separating brake coil

K1': normally closed contact group K1 ″ of first relay: normally open contact group of first relay

K2': normally closed contact group K2 ″ of the second relay: normally open contact group of second relay

K3': normally closed contact group K3 ″ of the third relay: normally open contact group of third relay

K4': normally closed contact group K4 ″ of the fourth relay: normally open contact group of fourth relay

K5': normally closed contact group K5 ″ of the fifth relay: normally open contact group of fifth relay

K6': normally closed contact group K6 ″ of the sixth relay: normally open contact group of sixth relay

K7': normally closed contact group K7 ″ of the seventh relay: normally open contact group of seventh relay

K8': normally closed contact group K8 ″ of eighth relay: normally open contact group of eighth relay

K9': normally open contact group K10' of the ninth relay: normally closed contact group of tenth relay

K10': normally open contact set KS' of the tenth relay: normally closed contact group of counting electrical appliance

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

As described above, when a switch device is subjected to a life test, since a mechanical life test platform cannot perform an electrical life test and an electrical life test platform cannot perform the mechanical life test, it is necessary to test the mechanical life of the switch device through the mechanical life test platform and test the electrical life of the switch 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, the switch device is transferred from one test platform to the other test platform for testing, long time needs to be consumed for fixing and wiring the switch device, and the efficiency of carrying out life test on the switch device is low.

In the embodiment of the application, the service life testing device of the switch device comprises a switching module, a mechanical service life testing mode and an electrical service life testing mode can be switched through the switching module, under the electrical service life testing mode, an electrical service life testing platform normally tests the electrical service life of the switch device, under the mechanical service life testing mode, the service life testing device of the switch device comprises a control module, a fault detection module and an alarm module, the mechanical service life testing can be carried out on the switch device based on the electrical service life testing platform, so that the electrical service life testing and the mechanical service life testing can be carried out on the switch device on the electrical service life testing platform, the time for fixing and wiring the switch device when the switch device is transferred between different testing platforms is saved, and the service life testing efficiency of the switch device can be improved. In addition, through the switch device service life testing device, the electrical service life testing and the mechanical service life testing can be carried out on the switch device by using the electrical service life testing platform, and the utilization power of the electrical service life testing platform is improved.

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

The following describes in detail a lifetime testing apparatus for a switching device provided in an embodiment of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a device for testing lifetime of a switching device according to an embodiment of the present application. As shown in fig. 1, the switching device life test apparatus 100 includes: the system comprises 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 a mechanical life test mode and an 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 deactivated, and the electrical life test platform can perform electrical life test on the switching device. The control module 102 may control the switching device to perform a closing operation and an opening operation according to a control signal of the controller in the electrical life testing platform. The fault detection module 103 may detect an action execution result of the switching device, and may send an alarm instruction to the alarm module 104 when the switching device does not successfully execute a closing action or an opening action. The alarm module 104 sends out an alarm signal after receiving the alarm instruction, and indicates that the mechanical life test of the switch device does not pass.

The electric service life testing platform comprises a motor, a cylinder, an electromagnetic valve and other driving mechanisms, and the driving mechanisms can drive the switching devices to perform switching-on and switching-off actions. The electric service life test platform further comprises a Controller, wherein the Controller can be a single chip microcomputer, a Programmable Logic Controller (PLC), a Field Programmable Gate Array (FPGA), and the like. The controller can send a closing instruction and an opening instruction to control the driving mechanism to drive the switching device to execute a closing action or an opening action.

It should be understood that the electrical life testing platform includes a drive mechanism and a controller that are common components for performing both mechanical life testing and electrical life testing. When the electric service life test is carried out, the controller controls the driving mechanism to act through a control circuit included in the electric service life test platform, and then the switching device is driven to execute switching-on action and switching-off action, so that the electric service life of the switching device is tested. When the mechanical life test is performed, the controller controls the driving mechanism to operate through the switch device life testing apparatus 100, and then drives the switch device to perform a closing operation and an opening operation, so as to test the mechanical life of the switch device.

In this embodiment, the switching module 101 may switch a test mode of the electrical life test platform to an electrical life test mode or a mechanical life test mode, in the electrical life test mode, the control module 102, the fault detection module 103, and the alarm module 104 are disabled, the electrical life test platform may perform an electrical life test on the switch device normally, 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 may perform a mechanical life test on the switch device by using the electrical life test platform. Through the switching device life testing device 100, the electrical life and the mechanical life of the switching device can be tested through the electrical life testing platform, so that the time for fixing and wiring the switching device when the switching device is transferred between different testing platforms is saved, and the efficiency for testing the service life of the switching device can be improved.

In one possible implementation, the fault detection module 103 includes at least two relays, each having a coil connected in series with a phase circuit in the switching device, and each having a contact set connected to the alarm module 104. When the switching device does not successfully execute a closing action or an opening action, the contact group of at least one relay in the relays is closed, an alarm instruction is sent to the alarm module 104, and then the alarm module 104 sends an alarm signal.

The switching device includes a plurality of circuits, for example, the switching device used in two-phase power includes a two-phase line of a neutral line and a two-phase line of a live line, and the switching device used in three-phase power includes a one-phase neutral line and a three-phase live line. Each phase circuit included by the switching device is connected with a coil of one relay in series, when the switching device does not successfully execute a switching-on action or a switching-off action, the coils of the relays cannot be completely and normally powered on or powered off, so that contact groups of part or all of the relays are closed, an alarm instruction is sent to the alarm module 104, the alarm module 104 sends out an alarm signal, and the switching device is indicated to be incapable of normally switching on or switching off according to the instruction.

In the embodiment of the application, when the mechanical life of the switching device is tested, each phase line of the switching device is connected in series with a coil of one relay, and when the switching device does not successfully execute a closing action or an opening action, the coils of part or all of the relays cannot be normally powered on or powered off, so that contact groups of part or all of the relays are closed, an alarm instruction is sent to the alarm module 104, and the alarm module 104 sends an alarm signal. The relay connected in series with each phase line in the switching device is used for detecting whether the switching device successfully executes the switching-on action or the switching-off action, so that the service life test can be performed on the switching devices with different numbers of phases such as one phase, two phases, three phases and the like, and the service life test device 100 of the switching device is ensured to have strong applicability.

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

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

The controller included in the electrical lifetime testing platform may send a switching-on signal or a switching-off 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 switched on or off. The controller controls the first control switch TP1 to be closed and controls a driving mechanism included in the electric service life testing platform to drive the switching device to execute a switching-on action, and the controller controls the second control switch TP2 to be closed and controls the driving mechanism to drive the switching device to execute a switching-off action.

After the controller controls the first control switch TP1 to be closed, if the switching device does not successfully execute the switching-on action, the coil of at least one relay of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 is powered off, the normally closed contact group of the relay with the powered-off coil is closed, the coil of the fifth relay K5 is powered on, the normally open contact group K5 'of the fifth relay K5 is closed after the coil of the fifth relay K5 is powered on, the normally open contact group K5' of the fifth relay K5 is closed, the buzzer HA is powered on, and the buzzer HA sends an alarm signal after being powered on to indicate that the switching device does not successfully execute the switching-on action.

In the embodiments of the present application, the de-energizing of the coil of the relay means that the coil of the relay is not energized, the energizing of the coil of the relay means that the coil of the relay is energized, and the energizing and de-energizing means states in which the coil of the relay is located, and the switching between the energized state and the de-energized state is not limited. The coil of the relay may be switched from energized to de-energized, at which time the coil of the relay switches from an energized state to an de-energized state. The coil of the relay remains energized, meaning that the coil of the relay remains energized. The coil of the relay remains de-energized means that the coil of the relay remains in an unpowered state.

For example, after the controller controls the first control switch TP1 to be closed, if the N-pole contact in the switching device is not successfully switched on, the coil of the first relay K1 is powered off, the normally closed contact group K1 'of the first relay K1 is closed after the coil of the first relay K1 is powered off, the normally closed contact group K1' of the first relay K1 is closed to electrify the coil of the fifth relay K5, the normally open contact group K5 ″ of the fifth relay K5 is closed after the coil of the fifth relay K5 is electrified, the normally open contact group K5 ″ of the fifth relay K5 is closed to electrify the buzzer HA, and the buzzer HA sends out an alarm signal after being electrified to indicate that the switching device does not successfully execute a switching-on action.

After the controller controls the first control switch TP1 to be closed, if the switching device successfully executes a switching-on action, the coils of the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 are all electrified, 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 are all disconnected, the coil of the fifth relay K5 is powered off, the normally open contact group K5' of the fifth relay K5 is disconnected after the coil of the fifth relay K5 is powered off, the normally open contact group K5' of the fifth relay K5 and the normally open contact group K6' of the sixth relay K6 are both disconnected, so that the buzzer HA is powered off, and the buzzer HA cannot send an alarm signal.

After the controller controls the second control switch TP2 to be closed, if the switching device does not successfully execute the switching-off action, the coil of at least one relay in the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 is electrified, the normally open contact group of the relay electrified by the coil is closed, the coil of the sixth relay K6 is electrified, the normally open contact group K6 'of the sixth relay K6 is closed after the coil of the sixth relay K6 is electrified, the normally open contact group K6' of the sixth relay K6 is closed, the buzzer HA is electrified, an alarm signal is sent out after the buzzer HA is electrified, and the switching-off action is indicated that the switching device does not successfully execute the switching-off action.

For example, after the controller controls the second control switch TP2 to be closed, if the N-pole contact in the switching device is not successfully opened, the coil of the first relay K1 is energized, the normally open contact group K1 ″ of the first relay K1 is closed after the coil of the first relay K1 is energized, the normally open contact group K1 ″ of the first relay K1 is closed to energize the coil of the sixth relay K6, the normally open contact group K6 ″ of the sixth relay K6 is closed after the coil of the sixth relay K6 is energized, the normally open contact group K6 ″ of the sixth relay K6 is closed to energize the buzzer HA, and the buzzer HA sends out an alarm signal after being energized to indicate that the switching device HAs not successfully executed the opening operation.

After the controller controls the second control switch TP2 to be closed, if the switching device successfully executes 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, 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 are all disconnected, the coil of the sixth relay K6 is powered off, the normally open contact group K6 ″ of the sixth relay K6 is disconnected after the coil of the sixth relay K6 is powered off, the normally open contact group K5 ″ of the fifth relay K5 and the normally open contact group K6 ″ of the sixth relay K6 are all disconnected, the buzzer HA is powered off, and therefore the buzzer HA cannot send out an alarm signal.

In the embodiment of the application, each phase of wiring terminal of the switch device is connected in series with one relay, the normally closed contact group of each relay is connected in series with the coil of the fifth relay K5 after being connected in parallel, the normally open contact group of each relay is connected in series with the coil of the sixth relay K6 after being connected in parallel, when the switch device fails to perform a closing action successfully, the coil of at least one relay is powered off and the normally closed contact group is closed, the coil of the fifth relay K5 is powered on and the normally open contact group K5 'is closed, further, a buzzer HA alarm is triggered, when the switch device fails to perform a separating action successfully, the coil of at least one relay is powered on and the normally open contact is closed, the coil of the sixth relay K6 is powered on and the normally open contact group K6' is closed, further, the buzzer HA alarm is triggered. Because each phase of the switch device is connected with one relay, any phase of the switch device can not be successfully closed or opened, the buzzer HA can be triggered to give an alarm, and the accuracy of testing the switch device is ensured.

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

One end of the first control switch TP1 is connected with the positive electrode of the external power supply, the other end of the first control switch TP1 is connected with the input end of the first contact group in the first transfer switch SA1, the output end of the first contact group in the first transfer switch SA1 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, the input end of the normally closed contact group K3 'of the third relay K3 and 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 output end of the normally closed contact group K2' of the second relay K2, 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 connected with the input end of the coil of the fifth relay K5, and the output end of the coil of the fifth relay K5 is connected with the negative electrode of the external power supply.

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

It should be noted that, when the mechanical life test is performed on the switching device, the switching device does not need to be connected to the main circuit, and only needs to detect whether each phase contact of the switching device can be normally separated and contacted through a small voltage, so that the external power supply can be a dc power supply with a small voltage, for example, the external power supply is a 24V dc power supply, thereby ensuring the safety of the mechanical life test process.

In the embodiment of the present application, first transfer switch SA1 and first control switch TP1 are connected between external power supply and the normally closed contact group K1 'of first relay K1, the normally closed contact group K2' of second relay K2, the normally closed contact group K3 'of third relay K3 and the normally closed contact group K4' of fourth relay K4, and first transfer switch SA1 and second control switch TP2 are connected between external power supply and the normally open contact group K1 "of first relay K1, the normally open contact group K2" of second relay K2, the normally open contact group K3 "of third relay K3 and the normally open contact group K4" of fourth relay K4, when first transfer switch SA1 is closed, first relay K1, second relay K2, the contact groups of third relay K3 and fourth relay K4 can respond to the opening and closing of switching device and take place separation or closure, realize that the mechanical life of switching device is tested, when first transfer switch SA1 is disconnected, first relay K1, second relay K2, the contact group of third relay K3 and fourth relay K4 can respond to the opening and closing of switching device and take place separation or closure of switching device, thereby the mechanical life test the mechanical life of switching device and the normal life of switching device, thereby the switching relay can improve the mechanical life of the switching relay K3 and the switching device, thereby the mechanical life of the electrical test platform can be carried out and the mechanical life of the switching device.

In one possible implementation, 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 of first relay K1's normally closed contact group K1', the output of second relay K2's normally closed contact group K2', the output of third relay K3's normally closed contact group K3' and the output of fourth relay K4's normally closed contact group K4' all are connected with the input of seventh relay K7's coil, and the output of seventh relay K7's coil is connected with external power source's negative pole. The output of first relay K1's normally open contact group K1 ", the output of second relay K2's normally open contact group K2", the output of third relay K3's normally open contact group K3 "and the output of fourth relay K4's normally open contact group K4" all are connected with the input of eighth relay K8's coil, and the output of eighth relay K8's coil is connected with external power source's negative pole.

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, the other end of the normally closed contact group K5' of the fifth relay K5 is connected with one end of the normally closed contact group K8 'of the eighth relay K8, 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, the other end of the normally closed contact group K10' of the tenth relay K10 is connected with 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 with the negative electrode 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, the other end of the normally closed contact group K6' of the sixth relay K6 is connected to one end of the normally closed contact group K7 'of the seventh relay K7, the other end of the normally closed contact group K7' of the seventh relay K7 is connected to an input end of a coil of the tenth relay K10, and an output end of the coil of the tenth relay K10 is connected to a negative electrode of the external power supply.

FIG. 3 is a schematic diagram of a control circuit for a switching device according to one embodiment of the present application. As shown in fig. 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.

When the switching device is in a switching-off 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 the moment, after the first control switch TP1 is closed, the coil of the ninth relay K9 is electrified, so that the normally open contact group K9 ' of the ninth relay K9 is closed, the switching-on coil P1 of the switching device is electrified after the normally open contact group K9 ' of the ninth relay K9 is closed, and the switching-on coil P1 is electrified to drive the switching device to execute a switching-on action.

When the switching device is in a closing 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 both closed, and after the second control switch TP2 is closed, the coil of the tenth relay K10 is energized, so that the normally open contact group K10 ″ of the tenth relay K10 is closed, the opening coil P2 of the switching device is energized after the normally open contact group K10 ″ of the tenth relay K10 is closed, and the switching device is driven to perform an opening action after the opening coil P2 is energized. After the coil of tenth relay K10 switched on, the normally closed contact group K10 'of tenth relay K10 breaks off, if first control switch TP1 is closed this moment, because normally closed contact group K10' of tenth relay K10 is in the off-state, ninth relay K9's coil outage, make ninth relay K9's normally open contact group K9 "keep breaking off, closing coil P1 outage when ninth relay K9's normally open contact group K9" is in the off-state, closing coil P1 can not drive the switching device and carry out the action of closing a floodgate, ninth relay K9 and tenth relay K10's interlocking has been realized, it drives the switching device action simultaneously to avoid closing coil P1 and separating brake coil P2, and then cause the condition of switching device damage to take place, guarantee the security of switching device life-test process.

In the embodiment of the application, after the switching device does not successfully execute the switching-on 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, and at this time, if the second control switch TP2 is closed, because the normally closed contact group K7' of the seventh relay K7 is in the disconnected state, the coil of the tenth relay K10 is de-energized, so that the normally open contact group K10 ″ of the tenth relay K10 is kept disconnected, the opening coil P2 is de-energized when the normally open contact group K10 ″ of the tenth relay K10 is in the disconnected state, and the opening coil P2 does not drive the switching device to execute the opening action, thereby stopping continuing to perform the mechanical life test on the switching device after the switching-on action is unsuccessfully executed by the switching device, further accurately determining the number of times of the switching-on action and the number of the opening action that have been completed before the switching-on action is unsuccessfully executed by the switching device, and ensuring the accuracy of the test result.

In the embodiment of the application, when the switching device does not successfully execute 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 is closed, because the normally closed contact group K8' of the eighth relay K8 is in the 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 is kept disconnected, the closing coil P1 is de-energized when the normally open contact group K9 ″ of the ninth relay K9 is in the disconnected state, the closing coil P1 does not drive the switching device to execute the closing action, thereby stopping continuing to perform the mechanical life test on the switching device after the switching device does not successfully execute the opening action, further accurately determining the number of times of closing actions and the number of opening actions that have been completed before the switching device does not successfully execute the opening action, and ensuring the accuracy of the test result.

After the switching device does not successfully execute the switching-on action to enable the coil of the fifth relay K5 to be electrified, the normally-open contact group K5' of the fifth relay K5 is closed to enable the buzzer HA to send out an alarm signal, meanwhile, the normally-closed contact group K5' of the fifth relay K5 is disconnected, if the first control switch TP1 is closed, as the normally-closed contact group K5' of the fifth relay K5 is in the disconnected state, the coil of the ninth relay K9 is powered off, the normally-open contact group K9 ' of the ninth relay K9 is kept disconnected, the switching-on coil P1 is powered off when the normally-open contact group K9 ' of the ninth relay K9 is in the disconnected state, the switching-on coil P1 cannot drive the switching device to execute the switching-on action, and therefore the switching-on action of the switching device is stopped to be continuously driven after the switching-on action of the switching device is not successfully executed by the switching device, and the mechanical life test is terminated.

After the switching device does not successfully execute the switching-off action to enable the coil of the sixth relay K6 to be electrified, the normally-open contact group K5' of the sixth relay K6 is closed to enable the buzzer HA to send out an alarm signal, meanwhile, the normally-closed contact group K6' of the sixth relay K6 is opened, if the second control switch TP2 is closed, because the normally-closed contact group K6' of the sixth relay K6 is in the off state, the coil of the tenth relay K10 is powered off, the normally-open contact group K10' of the tenth relay K10 is kept off, the switching-off coil P2 is powered off when the normally-open contact group K10' of the tenth relay K10 is in the off state, the switching-off coil P2 cannot drive the switching device to execute the switching-off action, and therefore the switching-off action of the switching device is stopped to be continuously driven after the switching-off action of the switching device is not successfully executed by the switching device, and the mechanical life test is stopped.

In one possible implementation, as shown in fig. 2, one end of the normally open contact group K7 ″ of the seventh relay K7 is connected to the positive electrode of the external power source, and the other end of the normally open contact group K7 ″ of the seventh relay K7 is connected to the input end of the first contact group in the first transfer switch SA1. One end of a normally open contact group K8 'of the eighth relay K8 is connected with the anode of the external power supply, and the other end of the normally open contact group K8' of the eighth relay K8 is connected with the input end of the second contact group in the first transfer switch SA1.

In the embodiment of the application, when the switching device does not successfully execute the switching-on 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, the self-locking of the seventh relay K7 is realized, no matter the first control switch TP1 is closed or opened after the normally-open contact group K7 ″ of the seventh relay K7 is closed, the coil of the fifth relay K5 is energized, so that the normally-open contact group K5 ″ of the fifth relay K5 is kept in a closed state, and further, the buzzer HA continuously sends out an alarm signal to prompt a user that the test of the mechanical life of the switching device is ended, therefore, the user does not need to watch during the mechanical life test of the switching device, the labor intensity of the user during the test can be reduced, and the use experience of the user is improved.

In this application embodiment, when the switching device did not successfully execute the opening action, the coil of eighth relay K8 switched on, make the normally open contact group K8 "of eighth relay K8 closed, the auto-lock of eighth relay K8 HAs been realized, no matter second control switch TP2 is closed or the disconnection after the normally open contact group K8" of eighth relay K8 was closed, the coil of sixth relay K6 all can be switched on, make the normally open contact group K6 "of sixth relay K6 keep the closure state, and then make bee calling organ HA continuously send alarm signal, in order to indicate the user to terminate the test of switching device mechanical life, consequently, carry out the mechanical life test process to the switching device, the user need not to guard, can reduce user's intensity of labour in the test process, user's use experience is improved.

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

In the embodiment of the application, after the normally open contact group K10 ″ of the tenth relay K10 is closed, the opening coil P2 is powered on, and then the opening coil P2 drives the switching device to perform an opening action, so the number of times of closing or opening of the normally open contact group K10 ″ of the tenth relay K10 is equal to the number of times of performing a closing action or an opening action by the switching device, a number threshold is preset according to a test requirement, after the number of times of closing or opening of the normally open contact group K10 ″ of the tenth relay K10 reaches the preset number threshold, the normally closed contact group KS' of the counting relay KS is opened, so that all relays except the counting relay KS are powered off, the mechanical life test of the switching device is stopped, at this time, the mechanical life test of the switching device can be determined to be qualified, the automatic stop of the mechanical life test after the switching device reaches the preset number of opening and closing is realized, the test process does not need to watch manually, and therefore the labor cost of the mechanical life test of the switching device can be reduced.

In one possible implementation, as shown in fig. 2, the fault detection module 103 may further include a second 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, the other end of the normally open contact group K9 'of the ninth relay K9 is connected with one end of the second change-over switch SA2, and the other end of the second change-over 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 breaker, the second transfer switch SA2 is opened.

In the embodiment of the present application, the contactor needs to continuously energize the closing coil P1 when performing the closing action, and the circuit breaker only needs to pulse the closing coil P1 when performing the closing action. When the mechanical life test is carried out on the contactor, the second change-over switch SA2 is closed, and after the coil of the ninth relay K9 is electrified, the normally-open contact group K9' of the ninth relay K9 is closed, so that the self-locking of the ninth relay K9 is realized, and the closing coil P1 can keep the electrified state to enable the contactor to be in the closing state. When the mechanical life test is carried out on the circuit breaker, the second change-over switch SA2 is switched off, when the first control switch TP1 is closed, the coil of the ninth relay K9 is electrified, the closing coil P1 is electrified to enable the circuit breaker to jump to a closing state, when the first control switch TP1 is switched off, the coil of the ninth relay K9 is powered off, the closing coil P1 is not electrified, but the circuit breaker is still kept in the closing state, and the opening coil P2 is indicated to be electrified. It can be seen that, by controlling the opening and closing of the second transfer switch SA2, the mechanical life test of the contactor or the circuit breaker can be performed by the switching device life test apparatus 100, which improves the applicability of the switching device life test apparatus 100.

It should be noted that, when the mechanical life test is performed on the contactor, after 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 disconnect the normally closed contact group K8', so that the self-locking of the ninth relay K9 is released, and the normal performance of the test process is ensured.

In one possible implementation, as shown in fig. 2, the switch device life testing apparatus 100 may further include a fuse FU and a start-stop button SB. Fuse FU's one end is connected with external power source's positive pole, and fuse FU's the other end is connected with the one end of opening and close button SB, opens and close button SB's the other end and is connected with the one end of counting relay KS's the one end of coil and counting relay KS's normally closed contact group KS ' respectively, and the other end of counting relay KS's coil is connected with external power source's negative pole.

In the embodiment of the present application, by providing the fuse FU, when the test circuit included in the switch device life testing apparatus 100 is over-current, the fuse FU fuses to cut off the external power supply, thereby preventing each relay in the switch device life testing apparatus 100 from being damaged due to over-current, and ensuring the safety of the switch device life testing apparatus 100. Through setting up and opening the stop button SB, when the abnormal conditions takes place for the testing process, can cut off external power supply through opening stop button SB, guarantee the security of testing process.

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

In the embodiment of the application, because the switching device performs the switching-on action and the switching-off action with a certain time delay, the fifth relay K5 and the sixth relay K6 are both time relays, and the time relays are relays that after adding or removing an action signal input by a meter, an output circuit needs to generate contact action within a specified time, namely, after the coil of the fifth relay K5 is electrified, the normally-open contact group K5 ″ is not immediately closed but is closed after a certain time delay, and after the coil of the sixth relay K6 is electrified, the normally-open contact group K6 ″ is not immediately closed but is closed after a certain time delay, so that the situation that the buzzer HA starts to alarm in the process of performing the switching-on action or the switching-off action of the switching device can be avoided, and the test process can be smoothly performed.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Finally, it is to be noted that: the above is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, but not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims (10)

1. A switching device lifetime testing apparatus (100), comprising: the device comprises 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 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 performed on the switching device based on an electrical life test platform, and in the electrical life test mode, the control module (102), the fault detection module (103) and the alarm module (104) are deactivated, and the electrical life test platform performs the electrical life test on the switching device;

the control module (102) is configured to control a switching device to perform switching-on action and switching-off action according to a control signal of the controller in the electrical service life testing platform;

the fault detection module (103) is configured to detect an action execution result of the switching device and send an alarm instruction to the alarm module (104) when the switching device does not successfully execute a closing action or an opening action;

and the alarm module (104) is used for sending out an alarm signal according to the alarm instruction.

2. The apparatus of claim 1, wherein the fault detection module (103) comprises: at least two relays;

the coil of each relay of the at least two relays is connected with the one-phase circuit of the switching device in series;

the contact sets of the at least two relays are connected with the alarm module (104);

when the switching device does not successfully execute a switching-on action or a switching-off action, the contact group of at least one relay of the at least two relays is closed, and an alarm instruction is sent to the alarm module (104).

3. The apparatus of claim 2,

the fault detection module (103) comprises: a first relay (K1), a second relay (K2), a third relay (K3) and a fourth relay (K4);

the alarm module (104) comprises: a fifth relay (K5), a sixth relay (K6) and a buzzer (HA);

the control module (102) comprises: a first control switch (TP 1) and a second control switch (TP 2);

the coils of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are respectively connected with the output end of a zero line and the output end of a three-phase live wire of a switching device;

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 and then are connected in series with coils of the first control switch (TP 1) and the fifth relay (K5);

the normally open contact sets of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are connected in parallel and then are connected in series with coils of the second control switch (TP 2) and the sixth relay (K6);

the normally open contact group (K5 ') of the fifth relay (K5) is connected with the normally open contact group (K6') of the sixth relay (K6) in parallel and then is connected with the buzzer (HA) in series.

4. The apparatus according to claim 3, characterized in that the switching module (101) comprises: a first changeover switch (SA 1);

one end of the first control switch (TP 1) is connected with the positive electrode of an external power supply, the other end of the first control switch (TP 1) is connected with the input end of a first contact group in the first transfer switch (SA 1), the output end of the first contact group is respectively connected with the input ends of normally closed contact groups of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4), and the output ends 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 with the input end of a coil of the fifth relay (K5);

one end of the second control switch (TP 2) is connected with the anode of an external power supply, the other end of the second control switch (TP 2) is connected with the input end of a second contact group in the first transfer switch (SA 1), the output end of the second contact group is respectively connected with the input end of a normally open contact group of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4), the output end of the normally open contact group of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) is connected with the input end of a coil of the sixth relay (K6).

5. The apparatus of claim 4,

the fault detection module (103) comprises: a seventh relay (K7) and an eighth relay (K8);

the control module (102): a ninth relay (K9) and a tenth relay (K10);

the output ends 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 connected with the input end of a coil of a seventh relay (K7), and the output end of the coil of the seventh relay (K7) is connected with the negative electrode of an external power supply;

the output ends of normally open contact sets of the first relay (K1), the second relay (K2), the third relay (K3) and the fourth relay (K4) are connected with the input end of a coil of an eighth relay (K8), and the output end of the coil of the eighth relay (K8) is connected with the negative electrode of an external power supply;

one end of a normally closed contact group (K5 ') of the fifth relay (K5) is connected with the other end of the first control switch (TP 1), the other end of the normally closed contact group (K5') of the fifth relay (K5) is connected with one end of a normally closed contact group (K8 ') of the eighth relay (K8), the other end of the normally closed contact group (K8') of the eighth relay (K8) is connected with one end of a normally closed contact group (K10 ') of the tenth relay (K10), the other end of the normally closed contact group (K10') of the tenth relay (K10) is connected with an input end of a coil of the ninth relay (K9), and an output end of the coil of the ninth relay (K9) is connected with a negative electrode of an external power supply;

one end of a normally closed contact group (K6 ') of the sixth relay (K6) is connected with the other end of the first control switch (TP 1), the other end of the normally closed contact group (K6') of the sixth relay (K6) is connected with one end of a normally closed contact group (K7 ') of the seventh relay (K7), the other end of the normally closed contact group (K7') of the seventh relay (K7) is connected with an input end of a coil of the tenth relay (K10), and an output end of the coil of the tenth relay (K10) is connected with a negative electrode of an external power supply;

the normally open contact group (K9 ') of the ninth relay (K9) is connected with the closing coil (P1) of the switch device in series, and the normally open contact group (K10') of the tenth relay (K10) is connected with the opening coil (P2) of the switch device in series.

6. The apparatus of claim 5,

one end of a normally open contact group (K7 ') of the seventh relay (K7) is connected with the positive electrode of an external power supply, and the other end of the normally open contact group (K7') of the seventh relay (K7) is connected with the input end of a first contact group in the first transfer switch (SA 1);

one end of a normally open contact group (K8 ') of the eighth relay (K8) is connected with the positive electrode of an external power supply, and the other end of the normally open contact group (K8') of the eighth relay (K8) is connected with the input end of a second contact group in the first transfer switch (SA 1).

7. The apparatus of claim 5, further comprising: a counting relay (KS);

the counting relay (KS) is connected with a normally open contact group (K10') of the tenth relay (K10);

one end of a normally closed contact group (KS ') of the counting relay (KS) is connected with the positive electrode of an external power supply, and the other end of the normally closed contact group (KS ') of the counting relay (KS) is respectively connected with one end of the first control switch (TP 1) and one end of a normally open contact group (K7 ') of the seventh relay (K7);

the counting relay (KS) is configured to count the opening and closing times of the switching devices according to the closing times or the opening times of the normally open contact group K10 ') of the tenth relay (K10), and the normally closed contact group (KS') is opened after the opening and closing times of the switching devices reach a preset time threshold value.

8. The apparatus of claim 7, wherein the fault detection module (103) further comprises: a second changeover switch (SA 2);

one end of a normally open contact group (K9 ') of the ninth relay (K9) is connected with the other end of a normally closed contact group (KS') of the counting relay (KS), the other end of the normally open contact group (K9 ') of the ninth relay (K9) is connected with one end of the second transfer switch (SA 2), and the other end of the second transfer switch (SA 2) is connected with one end of a normally closed contact group (K8') of the eighth relay (K8);

when the switching device is a contactor, the second change-over switch (SA 2) is closed, and when the switching device is a breaker, the second change-over switch (SA 2) is opened.

9. The apparatus of claim 7, further comprising: a Fuse (FU) and a start-Stop Button (SB);

the one end of Fuse (FU) is connected with external power source's positive pole, the other end of Fuse (FU) with the one end of opening the Stop Button (SB) is connected, open the Stop Button (SB) the other end respectively with the one end of the coil of count relay (KS) with the one end of the normally closed contact group (KS ') of count relay (KS) is connected, the other end of the coil of count relay (KS) is connected with external power source's negative pole.

10. The device according to any of the claims 3 to 9, characterized in that the fifth relay (K5) and the sixth relay (K6) are both time relays.

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