An automatic detection device for disconnectors

Abstract

The application discloses an automatic detection device of an isolating switch, and belongs to the technical field of isolating switch detection devices.

Description

Technical Field

[0001] This invention relates to the technical field of testing disconnect switches, and more particularly to an automatic testing device for disconnect switches. Background Technology

[0002] Currently, the design life of disconnecting switches in medium-voltage switchgear is increasing, making verification testing increasingly time-consuming and labor-intensive. For example, taking the current national standard of 3000 cycles as an example, a three-position disconnecting switch life test requires 12000 cycles. The disconnecting switch life test uses cyclical operations, where the disconnecting switch can only spontaneously perform single-step movements. To address this, existing patent technology CN109612696A describes a disconnecting switch testing platform device that connects the disconnecting switch's rocker arm via a swing arm mechanism, which automatically drives the rocker arm to complete all steps of the movement. However, this technology requires the combined action of a servo motor, swing arm mechanism, and programmable controller, resulting in a cumbersome structure. Furthermore, the servo motor and swing arm mechanism require significant additional space, limiting the number of disconnecting switch testing devices that can be used simultaneously. Therefore, simplifying the structure of disconnecting switch testing devices to facilitate disconnecting switch testing is crucial. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic testing device for disconnecting switches, which simplifies the structure of the disconnecting switch testing device and facilitates the testing of disconnecting switches.

[0004] To address the aforementioned technical problems, this invention discloses an automatic detection device for a disconnecting switch. The disconnecting switch includes a first motor, a second motor, a first limit switch group, a second limit switch group, a third limit switch group, and a fourth limit switch group. Each limit switch group includes a normally closed switch and a normally open switch. When the disconnecting switch is in the disconnected position, the normally closed switch of the first limit switch group is open, and the normally open switch of the second limit switch group is closed. When the disconnecting switch is in the disconnected position, the normally closed switch of the second limit switch group is open, and the normally open switch of the third limit switch group is closed. When the disconnecting switch is in the grounded position, the normally closed switch of the third limit switch group is open, and the normally open switch of the fourth limit switch group is closed. When the disconnecting switch is in the grounded position, the normally closed switch of the fourth limit switch group is open, and the normally open switch of the first limit switch group is closed.

[0005] The automatic detection device includes a power supply, a first relay, a second relay, a third relay, and a fourth relay.

[0006] One end of the power supply is electrically connected to one end of the normally closed switch of the target limit switch group via the coil of the target relay. The other end of the normally closed switch of the target limit switch group is electrically connected to the other end of the power supply via the normally open switch of the target relay. The other end of the normally closed switch of the target limit switch group is also connected to the other end of the power supply via the normally open switch of the target limit switch group.

[0007] Wherein, the target relay is the first relay, the second relay, the third relay, or the fourth relay; when the target relay is the first relay, the target limit switch group is the first limit switch group; when the target relay is the second relay, the target limit switch group is the second limit switch group; when the target relay is the third relay, the target limit switch group is the third limit switch group; when the target relay is the fourth relay, the target limit switch group is the fourth limit switch group.

[0008] One end of the power supply is connected to the other end of the power supply via another normally open switch of the first relay and then via the first motor, and is also connected to the other end of the power supply via another normally open switch of the second relay and then via the first motor.

[0009] One end of the power supply is connected to the other end of the power supply via another normally open switch of the third relay and then via the second motor, and then via another normally open switch of the fourth relay and then via the second motor to the other end of the power supply.

[0010] As an optional implementation, the target normally open switch of at least one of the first relay, the second relay, the third relay, and the fourth relay is a time-delayed closing switch, wherein the target normally open switch is a normally open switch connected in series with the first motor or the second motor.

[0011] As another optional implementation, the automatic detection device also includes a first circuit breaker and a second circuit breaker;

[0012] The first circuit breaker is used to protect the devices in the cyclic test control circuit; the devices in the cyclic test control circuit include the first limit switch group, the second limit switch group, the third limit switch group, the fourth limit switch group, the coil of the first relay, the coil of the second relay, the coil of the third relay, and the coil of the fourth relay;

[0013] The second circuit breaker is used to protect the devices in the motor control circuit; the devices in the motor control circuit include the first relay, the second relay, the third relay, the fourth relay, the first motor, and the second motor.

[0014] As another optional implementation, the disconnecting switch further includes an auxiliary switch, which closes when the disconnecting switch is in the disconnecting position or the grounding position, wherein:

[0015] The automatic detection device also includes a counter;

[0016] The two ends of the counter are electrically connected to the two ends of the auxiliary switch, respectively; the counter counts once each time it is short-circuited by the auxiliary switch.

[0017] The counter includes a detection end switch;

[0018] The detection end switch is a normally closed switch, which is installed on the common power supply line of the trip unit of the first circuit breaker and the trip unit of the second circuit breaker and is connected in series with each trip unit respectively; when the cumulative count of the counter reaches a preset value, the detection end switch opens and closes, the trip unit of the first circuit breaker opens due to power failure, and the trip unit of the second circuit breaker opens due to power failure.

[0019] As another optional implementation, the automatic detection device further includes a detection end indicator light; the counter further includes a detection end indicator light switch;

[0020] The detection end indicator light switch is a normally open switch, used to supply power to the detection end indicator light when the switch is closed; when the counter accumulates the number of counts to the preset value, the detection end indicator light switch is closed.

[0021] As another optional implementation, the first motor includes a first auxiliary switch;

[0022] The first auxiliary switch is a normally closed switch; when the current of the first motor is greater than the preset current, the first auxiliary switch is opened.

[0023] The first auxiliary switch is installed on the power supply line of the trip unit of the second circuit breaker and connected in series with the trip unit; when the first auxiliary switch is opened, the trip unit of the second circuit breaker is de-energized, causing the second circuit breaker to open.

[0024] As another optional implementation, the automatic detection device also includes a motor fault indicator light; the first motor also includes a second auxiliary switch, which is a normally open switch, and closes when the current of the first motor is greater than a preset current; the second auxiliary switch is used to supply power to the motor fault indicator light when the switch is closed.

[0025] As another optional implementation, the disconnecting switch further includes an isolation closing auxiliary switch, an opening auxiliary switch, and a grounding closing auxiliary switch, all of which are normally open switches; when the disconnecting switch is in the isolation closing position, the isolation closing auxiliary switch is closed; when the disconnecting switch is in the isolation opening position or the grounding opening position, the opening auxiliary switch is closed; when the disconnecting switch is in the grounding closing position, the grounding closing auxiliary switch is closed.

[0026] The automatic detection device also includes an isolation position indicator light, a separation position indicator light, and a grounding position indicator light;

[0027] The isolation position auxiliary switch is installed on the power supply line of the isolation position indicator light, and the switch is connected in series with the isolation position indicator light;

[0028] The auxiliary switch for the digit divider is installed on the power supply line of the digit divider indicator light, and the switch is connected in series with the digit divider indicator light.

[0029] The grounding position auxiliary switch is installed on the power supply line of the grounding position indicator light, and the switch is connected in series with the grounding position indicator light.

[0030] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0031] This invention utilizes the limit switch group on the disconnector switch, automatically controlling the energization of two motors based on four relays, thereby achieving multi-step automatic cyclic operation of the disconnector switch and automating the disconnector switch life test. Compared to the existing technology that uses a complex structure composed of servo motors, lever mechanisms, and programmable controllers for automatic detection, this invention is structurally simpler and easier for testers to use. Furthermore, this application only adds relays, which can be more easily integrated into the longitudinal direction of the disconnector switch compared to servo motors and lever mechanisms, avoiding the additional lateral space required by existing technologies that use servo motors and lever mechanisms. This improves space utilization and allows for an increase in the number of disconnector switch testing devices that can be used simultaneously, thus improving testing efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the cyclic test control loop of an automatic testing device for disconnecting switches disclosed in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the motor control circuit of an automatic detection device for a disconnector disclosed in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the indicator light circuit structure of an automatic detection device for a disconnector disclosed in an embodiment of the present invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] See Figure 1-3 This invention discloses an automatic detection device for a disconnecting switch. The disconnecting switch includes a first motor M1, a second motor M2, a first limit switch group, a second limit switch group, a third limit switch group, and a fourth limit switch group. Each limit switch group includes a normally closed switch and a normally open switch. When the disconnecting switch is in the disconnected position, the normally closed switch SQ11 of the first limit switch group is open, and the normally open switch SQ12 of the second limit switch group is closed. When the disconnecting switch is in the disconnected position, the normally closed switch SQ22 of the second limit switch group is open, and the normally open switch SQ41 of the third limit switch group is closed. When the disconnecting switch is in the grounded position, the normally closed switch SQ31 of the third limit switch group is open, and the normally open switch SQ32 of the fourth limit switch group is closed. When the disconnecting switch is in the grounded position, the normally closed switch SQ42 of the fourth limit switch group is open, and the normally open switch SQ21 of the first limit switch group is closed.

[0038] The automatic detection device includes a power supply KM, a first relay KT1, a second relay KT2, a third relay KT3, and a fourth relay KT4.

[0039] One end of the power supply KM is electrically connected to one end of the normally closed switch of the target limit switch group via the coil of the target relay. The other end of the normally closed switch of the target limit switch group is electrically connected to the other end of the power supply KM via the normally open switch of the target relay. The other end of the normally closed switch of the target limit switch group is also connected to the other end of the power supply KM via the normally open switch of the target limit switch group.

[0040] Wherein, the target relay is the first relay KT1, the second relay KT2, the third relay KT3, or the fourth relay KT4; when the target relay is the first relay KT1, the target limit switch group is the first limit switch group; when the target relay is the second relay KT2, the target limit switch group is the second limit switch group; when the target relay is the third relay KT3, the target limit switch group is the third limit switch group; when the target relay is the fourth relay KT4, the target limit switch group is the fourth limit switch group.

[0041] One end of the power supply KM is connected to the other end of the power supply KM via another normally open switch of the first relay KT1 and then via the first motor M1, and is also connected to the other end of the power supply KM via another normally open switch of the second relay KT2 and then via the first motor M1.

[0042] One end of the power supply KM is connected to the other end of the power supply KM via another normally open switch of the third relay KT3 and then via the second motor M2, and is also connected to the other end of the power supply KM via another normally open switch of the fourth relay KT4 and then via the second motor M2.

[0043] In this embodiment of the invention, the power supply KM is an externally drawn mains power supply or a commonly used AC / DC power supply KM.

[0044] In this embodiment of the invention, the disconnecting switch is a GN-type disconnecting switch, such as GN-1250 or GN-2250. This disconnecting switch is equipped with a limit switch group for outputting the current position information of the disconnecting switch, and also includes a motor for changing the position of the disconnecting switch. Motor M1 can switch the disconnecting switch between the disconnecting open and disconnecting close positions, while motor M2 can switch the disconnecting switch between the grounding open and grounding close positions. It should be noted that the disconnecting open and grounding open positions are actually the same physical location, used only to distinguish the direction of movement of the disconnecting switch. This embodiment utilizes this limit switch group to automatically control the energization of two motors based on four relays, thereby realizing the automatic cyclic operation of the disconnecting switch in multiple steps, and achieving automatic execution of the disconnecting switch life test. Compared to existing technologies that use a complex structure consisting of a servo motor, a rocker arm mechanism, and a programmable controller to achieve automatic detection, this invention is structurally simpler and easier for testers to use. Furthermore, this application only adds a relay, which can be more easily integrated into the longitudinal direction of the disconnect switch compared to the servo motor and rocker arm mechanism. This avoids the need for additional lateral space required by existing technologies that use servo motors and rocker arm mechanisms, thus improving space utilization and increasing the number of disconnect switch detection devices that can be used simultaneously, thereby improving detection efficiency.

[0045] In an optional embodiment, the target normally open switch of at least one of the first relay KT1, the second relay KT2, the third relay KT3, and the fourth relay KT4 is a time-delayed closing switch, wherein the target normally open switch is a normally open switch connected in series with the first motor M1 or the second motor M2.

[0046] In this embodiment, as Figure 2 The diagram shows the case where the target normally open switches of the first relay KT1, the second relay KT2, the third relay KT3, and the fourth relay KT4 are all time-delayed closing switches.

[0047] Because the power-on sequence in a single cycle is first motor M1 - second motor M2 - second motor M2 - first motor M1, in multiple consecutive cycles: each motor starts twice consecutively, then switches to another motor, and the switched motor also starts twice consecutively before switching back to the original motor. This embodiment, by setting a time-delay closing switch, ensures that the motor is powered on only after a preset time, which helps the motor to stop and dissipate heat during that preset time, thus improving its service life.

[0048] In yet another optional embodiment, the automatic detection device further includes a first circuit breaker 1QF and a second circuit breaker 3QF;

[0049] The first circuit breaker 1QF is used to protect the devices in the cyclic test control circuit; the devices in the cyclic test control circuit include the first limit switch group, the second limit switch group, the third limit switch group, the fourth limit switch group, the coil of the first relay KT1, the coil of the second relay KT2, the coil of the third relay KT3, and the coil of the fourth relay KT4;

[0050] The second circuit breaker 3QF is used to protect the devices in the motor control circuit; the devices in the motor control circuit include the first relay KT1, the second relay KT2, the third relay KT3, the fourth relay KT4, the first motor M1, and the second motor M2.

[0051] In yet another optional embodiment, the disconnecting switch further includes an auxiliary switch SQ14, which closes when the disconnecting switch is in the disconnecting position or the grounding position, wherein:

[0052] The automatic detection device also includes a counter JSQ;

[0053] The two ends of the counter are electrically connected to the two ends of the auxiliary switch, respectively; the counter counts once each time it is short-circuited by the auxiliary switch.

[0054] The counter includes a detection end switch (not shown in the figure);

[0055] The detection end switch is a normally closed switch, installed on the shared power supply line of the trip unit of the first circuit breaker 1QF and the trip unit of the second circuit breaker 3QF, and connected in series with each trip unit. When the cumulative count of the counter reaches a preset value, the detection end switch opens and closes, causing the trip unit of the first circuit breaker 1QF to open due to power failure, and causing the trip unit of the second circuit breaker 3QF to open due to power failure.

[0056] In yet another optional embodiment, the automatic detection device further includes a detection end indicator light HW; the counter further includes a detection end indicator light switch;

[0057] The detection end indicator light switch is a normally open switch, used to supply power to the detection end indicator light when the switch is closed; when the counter accumulates the number of counts to the preset value, the detection end indicator light switch is closed.

[0058] In yet another alternative embodiment, the first motor M1 includes a first auxiliary switch;

[0059] The first auxiliary switch is a normally closed switch; when the current of the first motor M1 is greater than the preset current, the first auxiliary switch is opened;

[0060] The first auxiliary switch is installed on the power supply line of the trip unit of the second circuit breaker 3QF and connected in series with the trip unit; when the first auxiliary switch is opened, the trip unit of the second circuit breaker 3QF is de-energized, causing the second circuit breaker 3QF to open.

[0061] In yet another optional embodiment, the automatic detection device further includes a motor fault indicator light HY; the first motor M1 also includes a second auxiliary switch ( Figure 3 The second auxiliary switch is a normally open switch. When the current of the first motor M1 is greater than the preset current, the second auxiliary switch is closed. The second auxiliary switch is used to supply power to the motor fault indicator light when the switch is closed.

[0062] In another optional embodiment, the second motor M2 includes a third auxiliary switch; the third auxiliary switch is a normally closed switch; when the current of the second motor M2 is greater than a preset current, the third auxiliary switch is open; the third auxiliary switch is disposed on the power supply line of the trip unit of the second circuit breaker 3QF and connected in series with the trip unit; when the third auxiliary switch is open, the trip unit of the second circuit breaker 3QF is de-energized, causing the second circuit breaker 3QF to open; and the automatic detection device further includes a motor fault indicator light HY; the second motor M2 also includes a fourth auxiliary switch ( Figure 3 The fourth auxiliary switch (M2) is a normally open switch. When the current of the second motor M2 is greater than the preset current, the fourth auxiliary switch is closed. The fourth auxiliary switch is used to supply power to the motor fault indicator light when the switch is closed.

[0063] In another optional embodiment, the disconnecting switch further includes an isolation closing auxiliary switch, an opening auxiliary switch, and a grounding closing auxiliary switch, all of which are normally open switches; when the disconnecting switch is in the isolation closing position, the isolation closing auxiliary switch is closed; when the disconnecting switch is in the isolation opening position or the grounding opening position, the opening auxiliary switch is closed; when the disconnecting switch is in the grounding closing position, the grounding closing auxiliary switch is closed.

[0064] The automatic detection device also includes an isolation position indicator light HR, an open position indicator light HG, and a grounding position indicator light HR1.

[0065] The isolation position auxiliary switch is installed on the power supply line of the isolation position indicator light, and the switch is connected in series with the isolation position indicator light;

[0066] The auxiliary switch for the digit divider is installed on the power supply line of the digit divider indicator light, and the switch is connected in series with the digit divider indicator light.

[0067] The grounding position auxiliary switch is installed on the power supply line of the grounding position indicator light, and the switch is connected in series with the grounding position indicator light.

[0068] In this embodiment of the invention, indicator lights are provided so that testers can understand the current position of the disconnecting switch during the test by checking the disconnection position indicator light HR, the open position indicator light HG, and the grounding position indicator light HR1, thereby monitoring the test process.

[0069] Example 2

[0070] like Figure 1-3As shown, this embodiment of the invention discloses an automatic detection device for a disconnecting switch. When the disconnecting switch is in the disconnecting closed position, switch SQ12 is in the closed state, SQ22 is in the closed state, the coil of relay KT2 is energized, contacts 1-3 of relay KT2 close instantaneously, contacts 6-8 of KT2 delay for a period of time to allow the motor to stop and dissipate heat. Then contacts 6-8 of KT2 close, the motor M1 is energized and drives the disconnecting mechanism to move, causing the disconnecting switch to move from the disconnecting closed position to the disconnecting open position.

[0071] When the disconnecting switch leaves the disconnecting position, SQ12 changes from the closed state to the open state. Because contacts 1-3 of relay KT2 are closed, the travel relay KT2 is self-holding and will not lose power due to the change in the state of SQ12, thus preventing the circuit from being disconnected.

[0072] When the disconnecting switch reaches the open position, SQ22 changes from closed to open. At this time, the coil of relay KT2 is de-energized, contacts 6-8 of relay KT2 open, motor M1 is de-energized, the disconnecting switch mechanism stops moving, and the disconnecting switch remains in the open position. Contact SQ23 closes, and the open position indicator HG is energized and illuminates, indicating that the disconnecting switch is in the open state.

[0073] When the disconnector switch moves from the disconnected (closed) position to the open position, SQ41 and SQ31 are both closed. The coil of relay KT3 is energized, and contacts 1-3 of relay KT3 close momentarily. Contacts 6-8 of KT3 close after a short delay to allow the motor time to cool down. Then, contacts 6-8 of KT3 close, energizing motor M2. This drives the disconnector mechanism, causing the disconnector switch to move from the open position to the grounded (closed) position.

[0074] When the disconnecting switch leaves the disconnecting position, the state of SQ41 changes from closed to open. Because contacts 1-3 of relay KT3 are closed, relay KT3 is self-holding and will not lose power due to the change in the state of SQ41, thus preventing the circuit from being disconnected.

[0075] When the disconnecting switch reaches the grounding closed position, the state of SQ31 changes from closed to open. At this time, the coil of relay KT3 is de-energized, contacts 6-8 of relay KT3 open, motor M2 is de-energized, the disconnecting switch mechanism stops moving, and the disconnecting switch remains in the grounded position. Contact SQ33 closes, and the grounding position indicator HR1 is energized and illuminates, indicating that the disconnecting switch is in the grounded state.

[0076] When the disconnecting switch is in the grounded closed position, SQ32 and SQ42 are closed, the coil of relay KT4 is energized, and contacts 1-3 of relay KT4 close momentarily. Contacts 6-8 of KT4 close for a short period to allow the motor time to stop and cool down. Then, contacts 6-8 of KT4 close, energizing motor M2. This drives the disconnecting mechanism, causing the disconnecting switch to move from the grounded position to the grounded open position.

[0077] When the disconnecting switch leaves the grounding closed position, SQ32 changes from the closed state to the open state. Because contacts 1-3 of relay KT4 are closed, the travel relay KT4 is self-holding and will not lose power due to the change in the state of SQ32, thus preventing the circuit from being disconnected.

[0078] When the disconnecting switch reaches the grounding open position, SQ42 changes from the closed state to the open state. At this time, the coil of relay KT4 is de-energized, contacts 6-8 of relay KT4 open, motor M2 is de-energized, the disconnecting switch mechanism stops moving, and the disconnecting switch remains in the open position. Contact SQ23 closes, and the open position indicator light HG is energized and illuminates, indicating that the disconnecting switch is in the open state.

[0079] When the disconnecting switch is in the grounding open position, SQ11 and SQ21 are closed, the coil of relay KT1 is energized, and contacts 1-3 of relay KT1 close momentarily. Contacts 6-8 of KT1 close for a short period to allow the motor time to stop and cool down. Then, contacts 6-8 of KT1 close, energizing motor M1. This drives the disconnecting mechanism, moving the disconnecting switch from the grounding open position to the disconnecting closed position.

[0080] When the disconnecting switch is removed from the grounding position, SQ21 changes from the closed state to the open state. Because contacts 1-3 of relay KT1 are closed, the travel relay KT1 is self-holding and will not lose power due to the change in the state of SQ21, thus preventing the circuit from being disconnected.

[0081] When the disconnector switch reaches the closed position, SQ11 changes from the closed state to the open state. At this time, the coil of relay KT1 is de-energized, contacts 6-8 of relay KT1 open, motor M1 is de-energized, the disconnector switch mechanism stops moving, and the disconnector switch remains in the closed position. Contact SQ13 closes, and the closed position indicator light HR is energized and illuminates, indicating that the disconnector switch is in the closed state.

[0082] This completes one operation cycle, which is then repeated until the predetermined operation cycle is completed.

[0083] The content disclosed in the embodiments of this invention is only a preferred embodiment of the invention and is used only to illustrate the technical solutions of the invention, not to limit it. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this invention.

Claims

1. An automatic detection device for a disconnecting switch, the disconnecting switch comprising a first motor, a second motor, a first limit switch group, a second limit switch group, a third limit switch group, and a fourth limit switch group; each limit switch group includes a normally closed switch and a normally open switch; when the disconnecting switch is in the disconnected position, the normally closed switch of the first limit switch group is open, and the normally open switch of the second limit switch group is closed; When the disconnecting switch is in the disconnected position, the normally closed switch of the second limit switch group is open, and the normally open switch of the third limit switch group is closed. When the disconnecting switch is in the grounding closed position, the normally closed switch of the third limit switch group is open, and the normally open switch of the fourth limit switch group is closed; When the disconnecting switch is in the grounding position, the normally closed switch of the fourth limit switch group is open, and the normally open switch of the first limit switch group is closed. Its features are: The automatic detection device includes a power supply, a first relay, a second relay, a third relay, and a fourth relay; One end of the power supply is electrically connected to one end of the normally closed switch of the target limit switch group via the coil of the target relay. The other end of the normally closed switch of the target limit switch group is electrically connected to the other end of the power supply via the normally open switch of the target relay. The other end of the normally closed switch of the target limit switch group is also connected to the other end of the power supply via the normally open switch of the target limit switch group. Wherein, the target relay is the first relay, the second relay, the third relay, or the fourth relay; when the target relay is the first relay, the target limit switch group is the first limit switch group; when the target relay is the second relay, the target limit switch group is the second limit switch group; when the target relay is the third relay, the target limit switch group is the third limit switch group; when the target relay is the fourth relay, the target limit switch group is the fourth limit switch group. One end of the power supply is connected to the other end of the power supply via another normally open switch of the first relay and then via the first motor, and is also connected to the other end of the power supply via another normally open switch of the second relay and then via the first motor. One end of the power supply is connected to the other end of the power supply via another normally open switch of the third relay and then via the second motor, and then via another normally open switch of the fourth relay and then via the second motor to the other end of the power supply.

2. The automatic detection device according to claim 1, characterized in that, The target normally open switch of at least one of the first relay, the second relay, the third relay, and the fourth relay is a time-delayed closing switch, wherein the target normally open switch is a normally open switch connected in series with the first motor or the second motor.

3. The automatic detection device according to claim 1, characterized in that, It also includes the first circuit breaker and the second circuit breaker; The first circuit breaker is used to protect the devices in the cyclic test control circuit; the devices in the cyclic test control circuit include the first limit switch group, the second limit switch group, the third limit switch group, the fourth limit switch group, the coil of the first relay, the coil of the second relay, the coil of the third relay, and the coil of the fourth relay; The second circuit breaker is used to protect the devices in the motor control circuit; the devices in the motor control circuit include the first relay, the second relay, the third relay, the fourth relay, the first motor, and the second motor.

4. The automatic detection device according to claim 3, characterized in that, The disconnecting switch also includes an auxiliary switch, which closes when the disconnecting switch is in the disconnecting position or the grounding position. The automatic detection device also includes a counter; The two ends of the counter are electrically connected to the two ends of the auxiliary switch, respectively; the counter counts once each time it is short-circuited by the auxiliary switch. The counter includes a detection end switch; The detection end switch is a normally closed switch, which is installed on the common power supply line of the trip unit of the first circuit breaker and the trip unit of the second circuit breaker and is connected in series with each trip unit respectively. When the counter accumulates a preset number of counts, the detection end switch opens and closes, the trip unit of the first circuit breaker trips due to power failure, and the trip unit of the second circuit breaker trips due to power failure, causing the second circuit breaker to trip.

5. The automatic detection device according to claim 4, characterized in that, It also includes a test completion indicator light; the counter also includes a test completion indicator light switch; The test completion indicator switch is a normally open switch, used to supply power to the test completion indicator when the switch is closed; When the counter accumulates a certain number of counts, the detection end indicator light switch closes.

6. The automatic detection device according to claim 3, characterized in that, The first motor includes a first auxiliary switch; The first auxiliary switch is a normally closed switch; when the current of the first motor is greater than the preset current, the first auxiliary switch is opened. The first auxiliary switch is installed on the power supply line of the trip unit of the second circuit breaker and connected in series with the trip unit; When the first auxiliary switch is disconnected, the trip unit of the second circuit breaker trips due to power failure, causing the second circuit breaker to open.

7. The automatic detection device according to claim 6, characterized in that, It also includes a motor fault indicator light; the first motor also includes a second auxiliary switch, which is a normally open switch, and closes when the current of the first motor is greater than a preset current; The second auxiliary switch is used to supply power to the motor fault indicator light when the switch is closed.

8. The automatic detection device according to any one of claims 1-7, characterized in that, The disconnecting switch also includes an isolation closing auxiliary switch, an open auxiliary switch, and a grounding closing auxiliary switch, all of which are normally open switches; when the disconnecting switch is in the isolation closing position, the isolation closing auxiliary switch is closed. When the disconnecting switch is in the isolation position or the grounding position, the isolation auxiliary switch is closed; When the disconnecting switch is in the grounding closed position, the grounding closed auxiliary switch is closed; The automatic detection device also includes an isolation position indicator light, a separation position indicator light, and a grounding position indicator light; The isolation position auxiliary switch is installed on the power supply line of the isolation position indicator light, and the switch is connected in series with the isolation position indicator light; The auxiliary switch for the digit divider is installed on the power supply line of the digit divider indicator light, and the switch is connected in series with the digit divider indicator light. The grounding position auxiliary switch is installed on the power supply line of the grounding position indicator light, and the switch is connected in series with the grounding position indicator light.

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