Broken line monitoring device for control loop of permanent magnetic mechanism

Abstract

The utility model discloses a broken line monitoring device for a control loop of a permanent magnetic mechanism, which comprises a first external interface module, a second external interface module, an optocoupler module, a triode module, a relay module, a first resistor module, a second resistor module and a power supply module, the first external interface module is connected with the optocoupler module through the first resistor module, the optocoupler module is connected with the triode module through the second resistor module, the triode module is connected with the relay module through the second resistor module, and the relay module is connected with the second external interface module. And the power supply module supplies power to each module through the second resistor module, so that the disconnection monitoring function of the control loop of the permanent magnetic mechanism driven by the optocoupler is realized.

Description

Technical Field

[0001] The utility model relates to the field of electrical engineering, and more specifically, to a disconnection monitoring device for a permanent magnet mechanism control loop. Background Art

[0002] In the power grid, the circuit breaker is an important part of the power system. Whether the closing control loop of the circuit breaker is intact directly affects whether the operation and protection commands can be correctly executed, and is related to the safe and stable operation of the power system. When a fault point appears in the closing control loop of the circuit breaker, it will cause the circuit breaker to fail to close normally. At this time, according to the prompt of the alarm system in the monitoring loop, the fault point needs to be found and repaired to enable the circuit breaker to close normally and smoothly, ensuring power supply reliability.

[0003] For the control loop of the spring operating mechanism, the closing and opening circuits include contacts and closing and opening coils. The internal resistance of the closing and opening coils is about a few ohms. The disconnection monitoring scheme for the control loop mainly uses a bypass loop added to the loop for monitoring. Since the impedance difference between the bypass loop and the closing and opening loops is relatively large, adding the disconnection monitoring of the control loop will not affect the normal operation of the original loop. With the development of the power grid in recent years, circuit breaker cabinets using permanent magnet mechanisms driven by optocouplers have become increasingly popular due to their fast closing and opening speeds. Such closing and opening loops use optocoupler isolation to control the switch, and the normal resistance value will be in the range of several k to dozens of k. If the original disconnection monitoring scheme for the control loop is adopted, misoperation of closing and opening will occur due to the excessive internal impedance of the permanent magnet driver.

[0004] The invention with the publication number of CN105305620B in the prior art discloses a disconnection monitoring system for the closing control loop of a circuit breaker, including a DC power supply, a microcomputer protection and measurement and control device, the working position auxiliary contact of the handcart-type circuit breaker, the auxiliary contact of the circuit breaker, the spring energy storage auxiliary contact, and the closing coil. By observing whether the monitoring green light for the tripping position on the protection and measurement and control device is on or off, it is possible to timely know whether the closing loop is intact. And through the above-mentioned relevant auxiliary contact control loop, switch input quantity information such as the handcart-type circuit breaker not being in the working position, the circuit breaker being in the tripping position, and the spring not being energized is respectively transmitted to the microcomputer protection and measurement and control device. Although the above scheme can realize the disconnection monitoring function of the control loop of the spring operating mechanism, it cannot realize the disconnection monitoring function of the control loop of the permanent magnet mechanism due to the excessive internal impedance of the permanent magnet driver.

[0005] The invention with the publication number of CN106707903B in the prior art discloses a novel permanent magnet mechanism controller for a high-voltage circuit breaker, which includes an isolated power supply module, an optocoupler isolation circuit I, an IGBT drive module, a energy storage power supply module, an energy storage capacitor, a closing relay, a tripping relay, an optocoupler isolation circuit II, a CPU control module, a travel switch of the high-voltage circuit breaker, a first coil detection circuit, and a second coil detection circuit; the closing relay receives a closing instruction through the first coil detection circuit, and the tripping relay receives a tripping instruction through the second coil detection circuit. This controller can monitor the control loop of the permanent magnet mechanism driven by the coil, but cannot monitor the control loop of the permanent magnet mechanism driven by the optocoupler. Summary of the Utility Model

[0006] The utility model provides a wire break monitoring device for a permanent magnet mechanism control loop to solve the problem that the current wire break monitoring device cannot realize the wire break monitoring function for the control loop of the permanent magnet mechanism driven by the optocoupler.

[0007] To solve the above technical problems, the technical solution of the utility model is as follows:

[0008] The utility model provides a wire break monitoring device for a permanent magnet mechanism control loop, which is characterized by including: a first external interface module, a second external interface module, an optocoupler module, a triode module, a relay module, a first resistor module, a second resistor module, and a power supply module. The first external interface module is connected to the optocoupler module through the first resistor module, the optocoupler module is connected to the triode module through the second resistor module, the triode module is connected to the relay module through the second resistor module, the relay module is connected to the second external interface module, and the power supply module supplies power to each module through the second resistor module.

[0009] Furthermore, the external interface module includes a first external interface module and a second external interface module. The first external interface module includes a closing and tripping common terminal HFCOM, a closing circuit HZ, and a tripping circuit FZ; the second external interface module includes a telemetry common terminal YXCOM and a control loop wire break signal KZHLDX. The specific connection relationship is as follows: the closing and tripping common terminal HFCOM is connected to the closing and tripping common terminal contact led outside the permanent magnet driver itself; the closing circuit HZ is connected to the first connection end of the closing optocoupler HZG inside the permanent magnet driver; the tripping circuit FZ is connected to the first connection end of the tripping optocoupler FZG inside the permanent magnet driver; the telemetry common terminal YXCOM is connected to the control loop wire break signal KZHLDX to connect to the remote monitoring system.

[0010] Furthermore, the optocoupler module includes a first optocoupler U1 and a second optocoupler U2, and the specific connection relationship is: the first connection end of the first optocoupler U1 is respectively connected to the external interface closing and opening common terminal HFCOM and the first connection end of the second optocoupler U2, the second connection end is connected to one end of the fifth resistor R5, the third connection end is grounded, and the fourth connection end is respectively connected to one end of the first resistor R1 and one end of the third resistor R3; the first connection end of the second optocoupler U2 is respectively connected to the closing and opening common terminal HFCOM and the first connection end of the first optocoupler U1, the second connection end is connected to one end of the tenth resistor R10, the third connection end is grounded, and the fourth connection end is respectively connected to one end of the sixth resistor R6 and one end of the eighth resistor R8.

[0011] Further, the transistor module includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4, and the specific connection relationship is: the base of the first transistor Q1 is connected to one end of the third resistor R3, the collector is connected to one end of the second resistor R2, and the emitter is connected to one end of the fourth resistor R4; the base of the second transistor Q2 is connected to the other end of the fourth resistor R4, the collector is connected to the first connection end of the relay K1, and the emitter is grounded; the base of the third transistor Q3 is connected to one end of the eighth resistor R8, the collector is connected to one end of the seventh resistor R7, and the emitter is connected to one end of the ninth resistor R9; the base of the fourth transistor Q4 is connected to the other end of the ninth resistor R9, the collector is connected to the first connection end of the relay K2, and the emitter is grounded.

[0012] Furthermore, the grounding corresponds to the negative ground of +24V DC.

[0013] Further, the relay module includes a first relay K1 and a second relay K2, and the specific connection relationship is: the first connection end of the first relay K1 is connected to the collector of the second transistor Q2, the second connection end is connected to the remote signal common terminal YXCOM, the third connection end is connected to the control loop disconnection signal KZHLDX, and the fourth connection end is respectively connected to the power module to which it belongs, one end of the first resistor R1, and one end of the second resistor R2; the first connection end of the second relay K2 is connected to the collector of the fourth transistor Q4, the second connection end is connected to the remote signal common terminal YXCOM, the third connection end is connected to the control loop disconnection signal KZHLDX, and the fourth connection end is respectively connected to the power module to which it belongs, one end of the sixth resistor R6, and one end of the seventh resistor R7.

[0014] Further, the resistance module includes a first resistance module and a second resistance module. The first resistance module includes a fifth resistor R5 and a tenth resistor R10. The second resistance module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. The specific connection relationship is as follows: One end of the first resistor R1 is respectively connected to the fourth connection end of the first relay K1, one end of the second resistor R2, and the power supply module, and the other end is respectively connected to the fourth connection end of the first optocoupler U1 and one end of the third resistor R3; One end of the second resistor R2 is connected to the collector of the first triode Q1, and the other end is respectively connected to the power supply module, one end of the first resistor R1, and the fourth connection end of the first relay K1; One end of the third resistor R3 is connected to the base of the first triode Q1, and the other end is respectively connected to the fourth connection end of the first optocoupler U1 and one end of the first resistor R1; One end of the fourth resistor R4 is connected to the emitter of the first triode Q1, and the other end is connected to the base of the second triode Q2; One end of the fifth resistor R5 is connected to the closing loop HZ of the external interface, and the other end is connected to the second connection end of the first optocoupler U1; One end of the sixth resistor R6 is respectively connected to the fourth connection end of the second optocoupler U2 and one end of the eighth resistor R8, and the other end is respectively connected to the power supply module, the fourth connection end of the second relay K2, and one end of the seventh resistor R7; One end of the seventh resistor R7 is connected to the collector of the third triode Q3, and the other end is respectively connected to the power supply module and one end of the sixth resistor R6; One end of the eighth resistor R8 is connected to the base of the third triode Q3, and the other end is respectively connected to the fourth connection end of the second optocoupler U2 and one end of the sixth resistor; One end of the ninth resistor R9 is connected to the emitter of the third triode Q3, and the other end is connected to the base of the fourth triode Q4.

[0015] Further, the power supply module is a +24V power supply.

[0016] Further, the monitoring device is connected in series in the permanent magnet mechanism control loop to be detected.

[0017] Further, the permanent magnet mechanism control loop is driven by an optocoupler.

[0018] Compared with the prior art, the beneficial effect of the technical solution of the present utility model is:

[0019] It solves the problem that the current disconnection monitoring device cannot realize the disconnection monitoring function of the permanent magnet mechanism control loop driven by an optocoupler, and provides a permanent magnet mechanism control loop disconnection monitoring device. This device realizes the monitoring and early warning function of the disconnection of the permanent magnet mechanism control loop driven by an optocoupler, ensuring the reliability and stability of the equipment operation. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of a monitoring device for disconnection of the control circuit of a permanent magnet mechanism. Specific implementation manners

[0021] The accompanying drawings are only for illustrative purposes and should not be construed as a limitation to this patent;

[0022] To better illustrate this embodiment, some components in the accompanying drawings are omitted, enlarged or reduced, which do not represent the dimensions of the actual product;

[0023] For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0024] The technical solutions of the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] As Figure 1 shown is a schematic structural diagram of a monitoring device for disconnection of the control circuit of a permanent magnet mechanism.

[0026] A monitoring device for disconnection of the control circuit of a permanent magnet mechanism, characterized by comprising: a first external interface module, a second external interface module, an optocoupler module, a triode module, a relay module, a first resistor module, a second resistor module, and a power supply module. The first external interface module is connected to the optocoupler module through the first resistor module, the optocoupler module is connected to the triode module through the second resistor module, the triode module is connected to the relay module through the second resistor module, the relay module is connected to the second external interface module, and the power supply module supplies power to each module through the second resistor module.

[0027] More specifically, the external interface module includes a first external interface module and a second external interface module. The first external interface module includes a closing and opening common terminal HFCOM, a closing circuit HZ, and a tripping circuit FZ; the second external interface module includes a telemetry common terminal YXCOM and a control circuit disconnection signal KZHLDX. The specific connection relationships are as follows: the closing and opening common terminal HFCOM is connected to the closing and opening common terminal contact led outside the permanent magnet driver itself; the closing circuit HZ is connected to the first connection end of the closing optocoupler HZG inside the permanent magnet driver; the tripping circuit FZ is connected to the first connection end of the tripping optocoupler FZG inside the permanent magnet driver; the telemetry common terminal YXCOM is connected to the control circuit disconnection signal KZHLDX to connect to the remote monitoring system.

[0028] In a specific embodiment, as Figure 1As shown, VCC inside the optocoupler-driven permanent magnet driver represents the internal power supply of the permanent magnet driver. HZG and FZG respectively represent the closing optocoupler and the opening optocoupler inside the permanent magnet driver, and HF_GND represents the signal ground of the closing and opening signals. The HFCOM, HZ, and FZ signals are connected to the corresponding disconnection circuits to be monitored. When the line is normal, the line will form a loop with the optocoupler in the driver. To avoid misoperation of the closing and opening control circuits due to this monitoring circuit, it is necessary to keep the optocoupler in the monitoring circuit in the conducting state while the optocoupler circuit in the permanent magnet driver is in the disconnected state. Therefore, appropriate input resistors R5, R10 and pull-up resistors R1, R6 need to be selected in the monitoring circuit to ensure that only the optocoupler in the monitoring circuit is conducted and the optocoupler circuit inside the permanent magnet driver is not conducted. The input resistors R5, R10 are selected according to the internal resistance of the matched permanent magnet driver, and the pull-up resistors R1, R6 are selected according to the transfer ratio of the optocoupler.

[0029] More specifically, the optocoupler module includes a first optocoupler U1 and a second optocoupler U2. The specific connection relationship is as follows: the first connection end of the first optocoupler U1 is respectively connected to the closing and opening common terminal HFCOM of the external interface and the first connection end of the second optocoupler U2, the second connection end is connected to one end of the fifth resistor R5, the third connection end is grounded, and the fourth connection end is respectively connected to one end of the first resistor R1 and one end of the third resistor R3; the first connection end of the second optocoupler U2 is respectively connected to the closing and opening common terminal HFCOM and the first connection end of the first optocoupler U1, the second connection end is connected to one end of the tenth resistor R10, the third connection end is grounded, and the fourth connection end is respectively connected to one end of the sixth resistor R6 and one end of the eighth resistor R8.

[0030] More specifically, the triode module includes a first triode Q1, a second triode Q2, a third triode Q3, and a fourth triode Q4. The specific connection relationship is as follows: the base of the first triode Q1 is connected to one end of the third resistor R3, the collector is connected to one end of the second resistor R2, and the emitter is connected to one end of the fourth resistor R4; the base of the second triode Q2 is connected to the other end of the fourth resistor R4, the collector is connected to the first connection end of the relay K1, and the emitter is grounded; the base of the third triode Q3 is connected to one end of the eighth resistor R8, the collector is connected to one end of the seventh resistor R7, and the emitter is connected to one end of the ninth resistor R9; the base of the fourth triode Q4 is connected to the other end of the ninth resistor R9, the collector is connected to the first connection end of the relay K2, and the emitter is grounded.

[0031] More specifically, the grounding corresponds to the negative ground of +24v direct current.

[0032] More specifically, the relay module includes a first relay K1 and a second relay K2, and the specific connection relationship is: the first connection end of the first relay K1 is connected to the collector of the second transistor Q2, the second connection end is connected to the remote signal common terminal YXCOM, the third connection end is connected to the control loop disconnection signal KZHLDX, and the fourth connection end is respectively connected to the power supply module, one end of the first resistor R1, and one end of the second resistor R2; the first connection end of the second relay K2 is connected to the collector of the fourth transistor Q4, the second connection end is connected to the remote signal common terminal YXCOM, the third connection end is connected to the control loop disconnection signal KZHLDX, and the fourth connection end is respectively connected to the power supply module, one end of the sixth resistor R6, and one end of the seventh resistor R7.

[0033] More specifically, the resistance module includes a first resistance module and a second resistance module, the first resistance module includes a fifth resistor R5 and a tenth resistor R10, the second resistance module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and the specific connection relationship is: one end of the first resistor R1 is respectively connected to the fourth connection end of the first relay K1, one end of the second resistor R2, and the power module, and the other end is respectively connected to the fourth connection end of the first optical coupler U1 and one end of the third resistor R3; one end of the second resistor R2 is connected to the collector of the first transistor Q1, and the other end is respectively connected to the power module, one end of the first resistor R1, and the fourth connection end of the first relay K1; one end of the third resistor R3 is connected to the base of the first transistor Q1, and the other end is respectively connected to the fourth connection end of the first optical coupler U1, the first One end of the fourth resistor R4 is connected to the emitter of the first transistor Q1, and the other end is connected to the base of the second transistor Q2; one end of the fifth resistor R5 is connected to the external interface closing loop HZ, and the other end is connected to the second connection end of the first optical coupler U1; one end of the sixth resistor R6 is respectively connected to the fourth connection end of the second optical coupler U2 and one end of the eighth resistor R8, and the other end is respectively connected to the power module, the fourth connection end of the second relay K2, and one end of the seventh resistor R7; one end of the seventh resistor R7 is connected to the collector of the third transistor Q3, and the other end is respectively connected to the power module and one end of the sixth resistor R6; one end of the eighth resistor R8 is connected to the base of the third transistor Q3, and the other end is respectively connected to the fourth connection end of the second optical coupler U2 and one end of the sixth resistor; one end of the ninth resistor R9 is connected to the emitter of the third transistor Q3, and the other end is connected to the base of the fourth transistor Q4.

[0034] In a specific embodiment, since the circuit of the disconnection monitoring device selects resistors with a value of several hundred k - 1M ohms, a two-stage triode amplifier is used in the circuit to drive the relay.

[0035] More specifically, the power supply module is a +24V power supply.

[0036] More specifically, the monitoring device is connected in series in the permanent magnet mechanism control loop to be detected.

[0037] More specifically, the permanent magnet mechanism control loop is driven by an optocoupler.

[0038] In a specific embodiment, when the closing circuit HZ is closed, the internal diode of the first optocoupler U1 conducts, the output terminal of the first optocoupler conducts, the base of the first triode Q1 is at a low level, the first triode is cut off, the base of the second triode Q2 is at a low level, the second triode is cut off, the coil of the first relay K1 loses power and does not attract, the normally open contact of the first relay disconnects, and the external interface remote signaling common terminal YXCOM is disconnected from the control circuit disconnection signal KZHLDX, and the control circuit disconnection signal is not output;

[0039] When the closing circuit HZ is disconnected, the internal diode of the first optocoupler U1 disconnects, the output terminal of the first optocoupler is cut off, the base of the first triode Q1 is at a high level, the first triode conducts, the base of the second triode Q2 is at a high level, the second triode conducts, the coil of the first relay K1 is energized and attracts, the normally open contact of the first relay closes, and the external interface remote signaling common terminal YXCOM is conducted with the control circuit disconnection signal KZHLDX, and the control circuit disconnection signal is output.

[0040] When the opening circuit FZ is closed, the internal diode of the second optocoupler U2 conducts, the output terminal of the second optocoupler conducts, the base of the third triode Q3 is at a low level, the third triode is cut off, the base of the fourth triode Q4 is at a low level, the fourth triode is cut off, the coil of the second relay K2 loses power and does not attract, the normally open contact of the second relay disconnects, and the external interface remote signaling common terminal YXCOM is disconnected from the control circuit disconnection signal KZHLDX, and the control circuit disconnection signal is not output.

[0041] When the opening circuit FZ is disconnected, the internal diode of the second optocoupler U2 disconnects, the output terminal of the second optocoupler is cut off, the base of the third triode Q3 is at a high level, the third triode conducts, the base of the fourth triode Q4 is at a high level, the fourth triode conducts, the coil of the second relay K2 is energized and attracts, the normally open contact of the second relay closes, and the external interface remote signaling common terminal YXCOM is conducted with the control circuit disconnection signal KZHLDX, and the control circuit disconnection signal is output.

[0042] When both the closing circuit HZ and the opening circuit FZ are disconnected, the opening circuit FZ and the closing circuit HZ are both disconnected from the common closing and opening terminal HFCOM. According to the above description, at this time, the coils of the first relay K1 and the second relay K2 are both energized and attracted, and the normally open contacts are both closed. The external interface telecontrol common terminal YXCOM is conducted with the control circuit disconnection signal KZHLDX, and the control circuit disconnection signal is output.

[0043] The terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation of this patent;

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A permanent magnet mechanism control circuit disconnection monitoring device, characterized in that: include: A first external interface module, a second external interface module, an optocoupler module, a transistor module, a relay module, a first resistor module, a second resistor module, and a power supply module. The first external interface module is connected to the optocoupler module through the first resistor module, the optocoupler module is connected to the transistor module through the second resistor module, the transistor module is connected to the relay module through the second resistor module, the relay module is connected to the second external interface module, and the power supply module supplies power to each module through the second resistor module.

2. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The external interface module includes a first external interface module and a second external interface module. The first external interface module includes a closing and opening common terminal HFCOM, a closing circuit HZ, and an opening circuit FZ; the second external interface module includes a remote signaling common terminal YXCOM and a control circuit disconnection signal KZHLDX. The specific connection relationship is: the closing and opening common terminal HFCOM is connected to the closing and opening common terminal contact point that has been led to the outside of the permanent magnet drive itself; the closing circuit HZ is connected to the first connection end of the closing optocoupler HZG inside the permanent magnet drive; the opening circuit FZ is connected to the first connection end of the opening optocoupler FZG inside the permanent magnet drive; the remote signaling common terminal YXCOM and the control circuit disconnection signal KZHLDX are connected to the remote monitoring system.

3. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The optocoupler module includes a first optocoupler U1 and a second optocoupler U2, and the specific connection relationship is: the first connection end of the first optocoupler U1 is respectively connected to the external interface closing and opening common terminal HFCOM and the first connection end of the second optocoupler U2, the second connection end is connected to one end of the fifth resistor R5, the third connection end is grounded, and the fourth connection end is respectively connected to one end of the first resistor R1 and one end of the third resistor R3; the first connection end of the second optocoupler U2 is respectively connected to the closing and opening common terminal HFCOM and the first connection end of the first optocoupler U1, the second connection end is connected to one end of the tenth resistor R10, the third connection end is grounded, and the fourth connection end is respectively connected to one end of the sixth resistor R6 and one end of the eighth resistor R8.

4. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The transistor module includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4, and the specific connection relationship is: the base of the first transistor Q1 is connected to one end of the third resistor R3, the collector is connected to one end of the second resistor R2, and the emitter is connected to one end of the fourth resistor R4; the base of the second transistor Q2 is connected to the other end of the fourth resistor R4, the collector is connected to the first connection end of the relay K1, and the emitter is grounded; the base of the third transistor Q3 is connected to one end of the eighth resistor R8, the collector is connected to one end of the seventh resistor R7, and the emitter is connected to one end of the ninth resistor R9; the base of the fourth transistor Q4 is connected to the other end of the ninth resistor R9, the collector is connected to the first connection end of the relay K2, and the emitter is grounded.

5. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 3 or 4, characterized in that: The grounding corresponds to the negative ground of +24V DC.

6. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The relay module includes a first relay K1 and a second relay K2, and the specific connection relationship is: the first connection end of the first relay K1 is connected to the collector of the second transistor Q2, the second connection end is connected to the remote signal common end YXCOM, the third connection end is connected to the control loop disconnection signal KZHLDX, and the fourth connection end is respectively connected to the power module to which it belongs, one end of the first resistor R1, and one end of the second resistor R2; the first connection end of the second relay K2 is connected to the collector of the fourth transistor Q4, the second connection end is connected to the remote signal common end YXCOM, the third connection end is connected to the control loop disconnection signal KZHLDX, and the fourth connection end is respectively connected to the power module to which it belongs, one end of the sixth resistor R6, and one end of the seventh resistor R7.

7. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The resistor module includes a first resistor module and a second resistor module, the first resistor module includes a fifth resistor R5 and a tenth resistor R10, the second resistor module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and the specific connection relationship is: one end of the first resistor R1 is respectively connected to the fourth connection end of the first relay K1, one end of the second resistor R2, and the power module, and the other end is respectively connected to the fourth connection end of the first optical coupler U1 and one end of the third resistor R3; one end of the second resistor R2 is connected to the collector of the first transistor Q1, and the other end is respectively connected to the power module, one end of the first resistor R1, and the fourth connection end of the first relay K1; one end of the third resistor R3 is connected to the base of the first transistor Q1, and the other end is respectively connected to the fourth connection end of the first optical coupler U1, the first resistor R2, and the fourth connection end of the first relay K1. 1; one end of the fourth resistor R4 is connected to the emitter of the first transistor Q1, and the other end is connected to the base of the second transistor Q2; one end of the fifth resistor R5 is connected to the external interface closing loop HZ, and the other end is connected to the second connection end of the first optical coupler U1; one end of the sixth resistor R6 is respectively connected to the fourth connection end of the second optical coupler U2 and one end of the eighth resistor R8, and the other end is respectively connected to the power module, the fourth connection end of the second relay K2, and one end of the seventh resistor R7; one end of the seventh resistor R7 is connected to the collector of the third transistor Q3, and the other end is respectively connected to the power module and one end of the sixth resistor R6; one end of the eighth resistor R8 is connected to the base of the third transistor Q3, and the other end is respectively connected to the fourth connection end of the second optical coupler U2 and one end of the sixth resistor; one end of the ninth resistor R9 is connected to the emitter of the third transistor Q3, and the other end is connected to the base of the fourth transistor Q4.

8. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The power supply module is a +24V power supply.

9. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The monitoring device is connected in series in the control loop of the detected permanent magnet mechanism.

10. A permanent magnet mechanism control circuit disconnection monitoring device according to claim 1, characterized in that: The permanent magnet mechanism control circuit is driven by an optical coupler.

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