CN115728630A - Open loop and monitoring device and method thereof - Google Patents

Abstract

The application relates to an outgoing loop and a monitoring device and method thereof. The device includes: the first sampling module is connected with the coil of the open relay and used for acquiring a first signal on the coil of the open relay; the second sampling module is connected with the input end and the output end of the open relay and used for acquiring second signals at the two ends of the open relay; and the processor is respectively connected with the first sampling module and the second sampling module and is used for determining the working state of the outgoing relay according to the first signal, determining the working state of the outgoing loop according to the second signal and determining whether the outgoing loop is in fault according to the working state of the outgoing relay and the working state of the outgoing loop. The device of the application realizes the monitoring of the switching-off relay and the monitoring of the switching-off loop.

Description

Open loop and monitoring device and method thereof

Technical Field

The present disclosure relates to electronic circuits, and particularly to an open loop and a monitoring device and method thereof.

Background

With the development of power systems, circuits in the power systems are more and more complex, and therefore, a fault of element short circuit often occurs, and in the power systems, an open loop is usually provided for protecting the circuits, the open loop is used for discharging current in the circuits so as to protect the circuits, and a common open loop includes a trip loop, for example, and if the open loop is abnormal, a serious fault of the power systems may be caused. Whether the open loop is normal or not directly affects the safety of the power system. Therefore, how to monitor whether the open circuit has a fault is a problem to be solved at present.

Disclosure of Invention

In view of the above, it is necessary to provide an open circuit, a monitoring device and a monitoring method thereof, which can monitor the state of the open circuit.

An open loop and a monitoring device thereof, the open loop comprises an open relay, the open relay can control the on-off of an external loop, the device comprises:

the first sampling module is connected with the coil of the opening relay and used for acquiring a first signal on the coil of the opening relay;

the second sampling module is connected with the input end and the output end of the output relay and used for acquiring a second signal on the output relay;

and the processor is respectively connected with the first sampling module and the second sampling module and is used for determining the working state of the outgoing relay according to the first signal, determining the working state of the outgoing loop according to the second signal and determining whether the outgoing loop is in fault according to the working state of the outgoing relay and the working state of the outgoing loop.

In one embodiment, the first signal is a first voltage across a coil of the opening relay, and the second sampling module includes: the sampling resistor is connected with the output end of the open relay in series; and the detection unit is connected with the input end and the output end of the switch-out relay and the two ends of the sampling resistor, and is used for acquiring the second voltages at the two ends of the switch-out relay and determining the first current on the switch-out relay.

In one embodiment, the processor is connected with the electromagnet of the opening relay and used for attracting the armature of the opening relay to close the opening relay when the electromagnet is electrified; the processor is used for determining whether to electrify the electromagnet according to an external control signal.

In one embodiment, the first signal is a first voltage across a coil of the outgoing relay, and the processor is further configured to determine an operating state of the outgoing relay according to the first voltage, and determine that the outgoing relay is abnormal if the operating state of the outgoing relay is different from the operating state of the outgoing relay included in the external control signal.

In one embodiment, the open-loop monitoring device further includes: an alarm module; the processor is connected with the alarm module and used for controlling the alarm module to give an alarm when the abnormal condition of the open relay is determined.

In one embodiment, the processor is further configured to control the alarm module to issue an alarm when the second voltage or the first current exceeds a corresponding threshold.

In one embodiment, the processor is further configured to determine an operating state of the open loop according to the first current and the second voltage, where the operating state of the open loop includes a before-open state, an in-open state, and a after-open state.

In one embodiment, the open-loop monitoring device further comprises: the analog-to-digital conversion module is arranged between the processor and the first sampling module and between the processor and the second sampling module, the input end of the analog-to-digital conversion module is respectively connected with the first sampling module and the second sampling module, the output end of the analog-to-digital conversion module is connected with the processor, and the analog-to-digital conversion module is used for converting the first signal into a first digital signal and transmitting the first digital signal to the processor and converting the second signal into a second digital signal and transmitting the second digital signal to the processor.

In one embodiment, the open-loop monitoring device further comprises: and the magnetic isolation module is arranged between the analog-to-digital conversion module and the processor in series and is used for carrying out magnetic isolation processing on the first digital signal and the second digital signal and then transmitting the processed signals to the processor.

An open circuit and a monitoring method thereof, wherein the open circuit comprises an open relay which discharges current on the open circuit to the outside when the open relay is closed, and the method comprises the following steps:

acquiring a first signal on a coil of the switching-off relay;

acquiring second signals of two ends of the open relay;

determining the working state of the outlet relay according to the first signal, and determining the working state of the outlet loop according to the second signal;

and determining whether the open circuit is in fault or not according to the working state of the open relay and the working state of the open circuit.

According to the outgoing loop and the monitoring device and method thereof, the first sampling module is arranged to obtain the first signal on the coil of the outgoing relay, the processor can judge the actual working state of the outgoing relay according to the first signal, so that whether the actual working state of the outgoing relay is consistent with the instruction received by the outgoing relay or not can be judged, the situation that whether the outgoing relay refuses to act or not can be monitored, and the monitoring of the outgoing relay is realized. Through setting up the second sampling module, can acquire the second signal of opening out the both ends of relay to the treater of being convenient for confirms the operating condition who opens out the return circuit according to the second signal, then according to the operating condition who opens out the relay and the operating condition who opens out the return circuit, confirms whether the return circuit breaks down, thereby has realized the monitoring to opening out the return circuit.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of an open loop and a monitoring device thereof;

FIG. 2 is a timing diagram of voltage and current on the switching device during a switching process in one embodiment;

FIG. 3 is a schematic diagram of another embodiment of an open circuit and a monitoring device thereof;

FIG. 4 is a schematic structural diagram of an open circuit and a monitoring device thereof in another embodiment;

FIG. 5 is a schematic structural diagram of an open circuit and a monitoring device thereof in another embodiment;

FIG. 6 is a schematic diagram of an embodiment of a test circuit;

FIG. 7 is a schematic diagram of a test circuit according to another embodiment;

FIG. 8 is a flow chart of an embodiment of an exit loop and a monitoring method thereof.

Description of reference numerals: 10-an open relay, 20-a first sampling module, 30-a second sampling module, 40-a processor, 31-a detection unit, 32-a sampling resistor, 50-an electromagnet, 60-an alarm module, 70-an analog-digital conversion module, 80-a magnetic isolation module, 90-a Bo electric tester, 91-an open loop monitoring device, 92-a power supply and 93-an analog circuit breaker.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

In one embodiment, as shown in fig. 1, there is provided an open loop and a monitoring device thereof, the open loop includes an open relay 10, the open relay 10 can control the on/off of the external loop, the device includes: a first sampling module 20, a second sampling module 30, and a processor 40. Wherein:

the first sampling module 20 is connected to the coil of the opening relay 10, and is configured to obtain a first signal on the coil of the opening relay 10.

Specifically, the open relay 10 includes a coil and an armature, and the armature of the open relay 10 is attracted to the electromagnet 50 when the corresponding electromagnet 50 is powered on, so that the open relay 10 is closed, and when the open relay 10 is closed, a current may exist on the coil of the open relay 10.

In particular, the first signal may be a current or a voltage on a coil of the opening relay 10.

The open circuit may be, for example, a trip circuit, which conducts the external circuit when tripped, thereby enabling current to be discharged to the external circuit.

The second sampling module 30 is connected to the input and output of the open relay 10, and is configured to obtain a second signal on the open relay 10.

Specifically, the working state of the open circuit can be determined by the second signal at the input end and the output end of the open relay 10, taking the trip circuit as an example, the voltage and current at the two ends of the relay of the trip circuit change in the trip process as shown in fig. 2, the relay of the trip circuit is opened in the pre-trip period 101 before the trip starts, the voltage at the two ends of the relay of the trip circuit is not 0 and the current is 0, the relay of the trip circuit is closed in the in-trip period 102 in the trip process, the voltage at the two ends of the relay is 0, but the current at the two ends of the relay is not 0 because the trip current is released through the trip circuit, and the voltage at the two ends of the relay is 0 and the current is 0 in the post-trip period 103 after the trip is completed. Therefore, the second signal can judge which state the open loop is in at present. After the tripping operation is finished, the working personnel can reset the tripping relay again, so that the next tripping operation is facilitated. And thus back to the pre-trip period 101.

The processor 40 is respectively connected to the first sampling module 20 and the second sampling module 30, and is configured to determine an operating state of the open relay 10 according to the first signal, determine an operating state of the open circuit according to the second signal, and determine whether the open circuit is faulty according to the operating state of the open relay and the operating state of the open circuit.

Specifically, the processor 40 can determine whether the relay 10 is closed or open according to whether the first signal is present. The current working state of the open loop can be judged through the second signal, and whether the open loop normally operates can be monitored through the change of the second signal. And if the working state of the open relay and the working state of the open loop are both normal, judging that the open loop is normal, otherwise, judging that the open loop has a fault.

In this embodiment, the first sampling module 20 is arranged to acquire the first signal on the coil of the outgoing relay 10, so that the processor 40 can judge the actual working state of the outgoing relay 10 according to the first signal, and therefore can judge whether the actual working state of the outgoing relay 10 is consistent with the instruction received by the outgoing relay 10, and further can monitor whether the outgoing relay 10 rejects, thereby monitoring the outgoing relay 10. Through setting up second sampling module 30, can acquire the second signal of the output of opening relay 10, the second signal that the output of opening relay 10 connects electricity promptly to be convenient for treater 40 according to the second signal, confirm the operating condition who opens the return circuit, then according to the operating condition who opens the relay and the operating condition who opens the return circuit, confirm whether open the return circuit and be out of order trouble, thereby realized the monitoring to opening the return circuit.

In one embodiment, as shown in fig. 3, the second sampling module 30 includes: a sampling resistor 32 and a detection unit 31. Wherein:

a sampling resistor 32 is connected in series with the output of the switch-out relay 10.

Specifically, the first signal is a first voltage on the coil of the opening relay 10, and the first sampling module 20 may be a voltmeter, by which the first voltage on the coil of the opening relay 10 may be measured.

Specifically, the sampling resistor 32 is a current sampling resistor 32 connected in series with the opening relay 10, so that the current flowing through the opening relay 10 can be sampled, and the resistance value of the sampling resistor 32 is a fixed value, so that the current flowing through the opening relay 10 can be determined according to the voltage on the sampling resistor 32.

The detection unit 31 is connected to the input end and the output end of the open relay 10 and two ends of the sampling resistor 32, and is configured to obtain a second voltage across the open relay 10 and determine a first current at the output end of the open relay 10.

Specifically, the detection unit 31 is connected to both ends of the opening relay 10, so that the second voltage across the opening relay 10 can be directly measured. The detection unit 31 is connected to both ends of the sampling resistor 32, so that the voltage across the sampling resistor 32 can be measured and the first current to open the output terminal of the relay 10 can be determined based on the resistance value of the sampling resistor 32 and the voltage across it.

In this embodiment, by setting the first sampling module 20, the first voltage on the coil of the outgoing relay 10 is obtained, and by setting the second sampling module 30, the second voltage at the two ends of the outgoing relay 10 and the first current at the output end of the outgoing relay 10 are obtained, so that the parameters required for monitoring the outgoing loop are obtained, and it is convenient to subsequently monitor the outgoing loop according to the parameters.

In one embodiment, as shown in fig. 4, the opening relay 10 further includes: an electromagnet 50. The electromagnet 50 is connected to the processor 40 and is configured to pull the armature of the outlet relay 10 when energized to close the outlet relay 10.

Specifically, the open relay 10 operates on the principle that its armature is closed when it is attracted by the electromagnet 50, and is open when it is not attracted by the electromagnet 50.

The processor 40 is configured to determine whether to energize the electromagnet 50 based on the external control signal.

Specifically, the processor 40 is connected to the electromagnet 50, and may determine whether to energize the electromagnet 50 according to an external control signal, so that the electromagnet 50 is activated, and then to pull the armature of the open relay 10 so that the open relay 10 is closed and conducted. The external control signal may be a short circuit signal, a trip signal, etc. in the circuit.

In this embodiment, the processor 40 is arranged to control whether to energize the electromagnet 50, and thus control whether the opening relay 10 is closed, thereby implementing the normal opening function of the opening circuit.

In one embodiment, the processor 40 is further configured to determine an operating state of the opening relay 10 according to the first voltage, and determine that the opening relay 10 is abnormal if the operating state of the opening relay 10 is different from the operating state of the opening relay 10 included in the external control signal.

Specifically, the open relay 10 includes a coil and an armature, and the armature of the open relay 10 is attracted to the electromagnet 50 when the corresponding electromagnet 50 is powered on, so that the open relay 10 is closed, and when the open relay 10 is closed, a current may exist on the coil of the open relay 10. Therefore, whether the open relay 10 is closed or not can be judged by detecting the first voltage on the coil of the open relay 10, and the actual working state of the open relay 10 can be acquired.

Specifically, the processor 40 can determine whether to energize the electromagnet 50 according to an external control signal so as to activate the electromagnet 50, and then attract the armature of the open relay 10 so as to close and conduct the open relay 10, that is, the working state of the open relay 10 should be the same as the command of the external control signal under the normal condition, but if the open relay 10 fails, a rejection condition may occur, that is, the external control signal received by the processor 40 controls the open relay 10 to be closed, but actually the open relay 10 is not closed, so that the open relay 10 fails, and the command sent by the processor 40 is not executed.

In this embodiment, the processor 40 can monitor the operating state of the opening relay 10 through the first voltage, and can further monitor whether the opening relay 10 has a fault. Thereby avoiding the situation that the power system can not discharge the trip current due to the fault of the open relay 10 and the serious consequences can occur. The safety of the power system is improved.

In one embodiment, with continued reference to fig. 4, the open-loop monitoring device further comprises: an alarm module 60. The processor 40 is connected to the alarm module 60, and is configured to control the alarm module 60 to issue an alarm when it is determined that the relay 10 is abnormal.

Illustratively, the alarm module 60 may be an audible and visual alarm.

In this embodiment, the alarm module 60 is arranged, so that an alarm can be given to remind a worker, and the worker can know a fault in time.

In one embodiment, processor 40 is further configured to control alarm module 60 to issue an alarm when the second voltage or the first current exceeds a corresponding threshold.

The processor 40 is further configured to determine an operating state of the open loop according to the first current and the second voltage, where the operating state of the open loop includes a state before opening, a state during opening, and a state after opening.

Specifically, the operating state of the open circuit can be determined by the first current and the second voltage, taking the trip circuit as an example, the voltage and the current of the two ends of the relay of the trip circuit change in the trip process as shown in fig. 2, the relay of the trip circuit is opened in the pre-trip period 101 before the trip starts, the second voltage of the relay of the trip circuit is not 0 at this time, the first current is 0, the relay of the trip circuit is being closed in the in-trip period 102 in the trip process, the second voltage is 0 at this time, but the first current is not 0 because the trip current is released through the trip circuit, and the second voltage is 0 and the first current is 0 in the post-trip period 103 after the trip is completed. So that it can be judged in which state the open circuit is currently in. After the tripping operation is finished, the working personnel can reset the tripping relay again, so that the next tripping operation is facilitated. And thus back to the pre-trip period 101.

Specifically, the processor 40 can determine the open loop state through the second voltage and the first current, and if the open loop state matches the state of the normal open process, that is, the state shown in fig. 2 is met. Judging that the open loop is normal, otherwise, judging that the open loop has a fault.

Specifically, if an ac ingress occurs in the open loop, the second voltage and the first current may be increased, so that by comparing the second voltage or the first current with the corresponding threshold, it may also be determined whether there is an abnormal situation such as an ac ingress in the open loop, thereby implementing monitoring of the open loop.

In this embodiment, the processor 40 monitors the open loop through the second voltage and the first current, and can give an alarm in time when the open loop is monitored to be abnormal, so as to improve the safety and reliability of the power system.

In one embodiment, as shown in fig. 5, the open-loop monitoring device further includes: an analog-to-digital conversion block 70. The analog-to-digital conversion module 70 is disposed between the processor 40 and the first sampling module 20 and the second sampling module 30, an input end of the analog-to-digital conversion module 70 is connected to the first sampling module 20 and the second sampling module 30, respectively, and an output end of the analog-to-digital conversion module 70 is connected to the processor 40, and is configured to convert the first signal into a first digital signal and transmit the first digital signal to the processor 40, and convert the second signal into a second digital signal and transmit the second digital signal to the processor 40.

Specifically, the analog-to-digital conversion module 70 is connected to the detection unit 31 in the second sampling module 30, and the analog-to-digital conversion module 70 can convert the analog signal into a digital signal, thereby facilitating subsequent data processing.

The analog-to-digital conversion module 70 may be an analog-to-digital converter, for example.

In the present embodiment, by providing the analog-to-digital conversion module 70, the analog quantity signal can be converted into the digital quantity signal for facilitating data processing.

In one embodiment, with continued reference to fig. 5, the open-loop monitoring device further comprises: a magnetic isolation module 80. The magnetic isolation module 80 is serially connected between the analog-to-digital conversion module 70 and the processor 40, and is configured to perform magnetic isolation processing on the first digital signal and the second digital signal, and then transmit the processed signals to the processor 40.

Specifically, the magnetic isolation module comprises two coupled magnetic isolation coil circuits, wherein the coil circuit receiving the first digital signal and the second digital signal can filter the first digital signal and the second digital signal, then transmit the first digital signal and the second digital signal to another coil circuit in an electromagnetic induction mode, and transmit the first digital signal and the second digital signal subjected to the magnetic isolation processing to the processor by the other coil circuit.

In this embodiment, by providing the magnetic isolation module, the magnetic isolation processing can be performed on the first signal and the second signal, so as to reduce noise and interference in the signals and improve the accuracy of the signals.

In one embodiment, the open loop monitoring device further comprises a power module. The power module is respectively connected with the processor, the first sampling module and the second sampling module and used for providing a driving power supply for each part.

In particular, the power supply module may be an isolated power supply.

In this embodiment, through setting up power module, can supply power for opening return circuit monitoring devices, guaranteed the normal work of opening return circuit monitoring devices.

For example, it may be experimentally detected whether the open loop monitoring device is reliable.

Experiment one: as shown in fig. 6, the pulse-current tester 90 applies a fault current to the open circuit monitoring device 91 to simulate tripping, and the operation of the one-way circuit breaker 93 is observed to determine whether the circuit breaker 93 can normally operate. The open circuit monitoring device 91 and the analog circuit breaker 93 are powered by a power supply 92.

Illustratively, the protection device is a PCS931 protection device.

Experiment two: as shown in fig. 7, the function of the open circuit monitoring device 91 for monitoring the ingress of ac is verified by applying an ac voltage to the open circuit monitoring device 91.

In one embodiment, as shown in fig. 8, there is provided an open loop and a monitoring method thereof, the open loop includes an open relay, and the open relay can control the open and the close of the external loop, the method includes:

step S800, a first signal on a coil of the outgoing relay is acquired.

Step S810, acquiring a second signal that opens out both ends of the relay.

And step S820, determining the working state of the opening relay according to the first signal, and determining the working state of the opening loop according to the second signal.

And step S830, determining whether the open loop is in fault according to the working state of the open relay and the working state of the open loop.

Specifically, whether the opening relay is closed or opened can be determined according to whether the first signal is present. The current working state of the open loop can be judged through the second signal, and whether the open loop normally operates can be monitored through the change of the second signal.

In this embodiment, through obtaining the first signal on the coil of the switch-out relay, be convenient for judge the actual operating condition of switch-out relay according to first signal to whether the actual operating condition of the switch-out relay is unanimous with the instruction that the switch-out relay received can be judged, and then can monitor whether the condition of refusing the action appears in the switch-out relay, realized the monitoring to switch-out relay. The second signals at the two ends of the outgoing relay are acquired, so that the working state of the outgoing circuit can be conveniently determined according to the second signals, and then whether the outgoing circuit has a fault or not is determined according to the working state of the outgoing relay and the working state of the outgoing circuit, so that the monitoring of the outgoing circuit is realized.

It should be understood that, although the steps in the flowchart of fig. 8 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 8 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic depictions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides an open return circuit and monitoring devices thereof which characterized in that, open the return circuit and include the open relay, the break-make of the steerable external circuit of open relay, the device includes:

the first sampling module is connected with the coil of the opening relay and used for acquiring a first signal on the coil of the opening relay;

the second sampling module is connected with the input end and the output end of the output relay and used for acquiring a second signal on the output relay;

and the processor is respectively connected with the first sampling module and the second sampling module and is used for determining the working state of the outgoing relay according to the first signal, determining the working state of the outgoing loop according to the second signal and determining whether the outgoing loop is in fault according to the working state of the outgoing relay and the working state of the outgoing loop.

2. The apparatus of claim 1, wherein the second sampling module comprises:

the sampling resistor is connected with the output end of the open relay in series;

and the detection unit is connected with the input end and the output end of the switch-out relay and the two ends of the sampling resistor, and is used for acquiring the second voltages at the two ends of the switch-out relay and determining the first current on the switch-out relay.

3. The device of claim 2, wherein the processor is connected to the electromagnet of the outlet relay and is configured to engage the armature of the outlet relay to close the outlet relay when the electromagnet is energized;

the processor is used for determining whether to electrify the electromagnet according to an external control signal.

4. The apparatus of claim 3, wherein the first signal is a first voltage across a coil of the outgoing relay, and wherein the processor is further configured to determine an operating state of the outgoing relay based on the first voltage, and determine that the outgoing relay is abnormal if the operating state of the outgoing relay is different from the operating state of the outgoing relay included in the external control signal.

5. The apparatus of claim 4, further comprising: an alarm module;

the processor is connected with the alarm module and used for controlling the alarm module to give an alarm when the abnormal condition of the open relay is determined.

6. The apparatus of claim 5, wherein the processor is further configured to control the alarm module to issue an alarm when the second voltage or the first current exceeds a corresponding threshold.

7. The apparatus of claim 2, wherein the processor is further configured to determine an operating state of the open loop according to the first current and the second voltage, and the operating state of the open loop comprises a pre-open state, a mid-open state, and a post-open state.

8. The apparatus of claim 1, further comprising:

the analog-to-digital conversion module is arranged between the processor and the first sampling module and between the processor and the second sampling module, the input end of the analog-to-digital conversion module is respectively connected with the first sampling module and the second sampling module, the output end of the analog-to-digital conversion module is connected with the processor, and the analog-to-digital conversion module is used for converting the first signal into a first digital signal and transmitting the first digital signal to the processor and converting the second signal into a second digital signal and transmitting the second digital signal to the processor.

9. The apparatus of claim 8, further comprising:

and the magnetic isolation module is arranged between the analog-to-digital conversion module and the processor in series and is used for carrying out magnetic isolation processing on the first digital signal and the second digital signal and then transmitting the processed signals to the processor.

10. An open circuit and a monitoring method thereof are characterized in that the open circuit comprises an open relay which can control the on-off of an external circuit, and the method comprises the following steps:

acquiring a first signal on a coil of the outgoing relay;

acquiring second signals of two ends of the open relay;

determining the working state of the outlet relay according to the first signal, and determining the working state of the outlet loop according to the second signal;

and determining whether the open circuit is in fault or not according to the working state of the open relay and the working state of the open circuit.

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