A device and method for detecting the pull-in state of an intermediate relay

Abstract

The present application discloses a device and method for detecting the energized state of an intermediate relay, and relates to the technical field of intermediate relay state detection. The device includes an MCU chip, a relay input circuit, and a state output circuit. The MCU chip is connected to the relay input circuit and the state output circuit respectively. The relay input circuit includes multiple KA points, and each KA point corresponds to a normally open contact of an intermediate relay; the state output circuit includes a Y point, and the Y point is connected to the input end of the controller; the MCU chip is used to detect the level changes of each KA point and the level changes of the Y point in real time. When a certain KA point changes in level, and the Y point does not change in level or the level change time exceeds the threshold, it is determined that the energized state of the intermediate relay corresponding to the KA point is abnormal, otherwise it is determined to be normal. The device of the present application has a simple structure and is easy to use. It can quickly and effectively detect whether the energized state of the intermediate relay is normal.

Description

Technical Field

[0001] The present application relates to the technical field of intermediate relay state detection, and in particular to an intermediate relay energized state detection device and method. Background Art

[0002] The underground control cabinet is mainly responsible for the remote control of underground water pumps, gate valves, fans and other equipment. It usually uses PLC and other controllers to control the intermediate relay to control the start and stop status of the above equipment. However, in actual use, due to the humid underground environment and large voltage fluctuations, the intermediate relay often arcs unstably, resulting in contact adhesion and non-tripping. Therefore, it is necessary to detect the pull-in state of the intermediate relay.

[0003] A traditional intermediate relay energized state detection device needs to connect a normally open contact of the intermediate relay to the input end of the controller when detecting the energized state of an intermediate relay. If there are 16 intermediate relays, the 16 normally open contacts need to be connected to the input end of the controller, which makes the circuit structure complicated and inconvenient to use.

[0004] Based on this, how to provide an intermediate relay energizing state detection device with a simple structure, convenient use and effectiveness has become a technical problem to be solved urgently in the field. Summary of the invention

[0005] The purpose of the present application is to provide a device and method for detecting the energized state of an intermediate relay, which has a simple structure and is easy to use, and can quickly and effectively detect whether the energized state of the intermediate relay is normal.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In the first aspect, the present application provides an intermediate relay energized state detection device, wherein the input end of the intermediate relay energized state detection device is respectively connected to multiple intermediate relays, the output end of the intermediate relay energized state detection device is respectively connected to the input end of a controller, the output end of the controller is respectively connected to multiple intermediate relays, and the intermediate relay energized state detection device is used to detect whether the energized state of each intermediate relay is normal under the control of the controller; the intermediate relay energized state detection device includes an MCU chip, a relay input circuit and a state output circuit, and the MCU chip is respectively connected to the relay input circuit and the state output circuit.

[0008] The relay input circuit includes a plurality of KA points, and each of the KA points is correspondingly connected to a normally open contact of the intermediate relay.

[0009] The state output circuit includes a Y point, and the Y point is connected to the input end of the controller.

[0010] The MCU chip is used to detect the level changes of each KA point and the level changes of the Y point in real time. When the level of one of the KA points changes and the level of the Y point does not change or the level change time exceeds a threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is abnormal, and the abnormal result is fed back to the controller; when the level of one of the KA points changes and the Y point also undergoes a corresponding level change and the level change time is less than or equal to the threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is normal; the level change includes a high level changing to a low level or a low level changing to a high level.

[0011] Optionally, the intermediate relay closure state detection device also includes a power supply circuit, which is respectively connected to the MCU chip, the relay input circuit and the state output circuit, and the power supply circuit is used to supply power to the MCU chip, the relay input circuit and the state output circuit respectively.

[0012] Optionally, the power supply circuit includes a synchronous step-down DC / DC converter.

[0013] Optionally, the relay input circuit is a 16-way relay input circuit.

[0014] Optionally, the 16-way relay input circuit includes KA1 point, KA2 point, KA3 point, KA4 point, KA5 point, KA6 point, KA7 point, KA8 point, KA9 point, KA10 point, KA11 point, KA12 point, KA13 point, KA14 point, KA15 point and KA16 point.

[0015] Optionally, the relay input circuit also includes a COM1 point.

[0016] Optionally, the status output circuit also includes a COM2 point.

[0017] Optionally, the controller is a PLC.

[0018] Optionally, the threshold is 1 second.

[0019] In a second aspect, the present application proposes a method for detecting the energized state of an intermediate relay, and the method for detecting the energized state of an intermediate relay includes the following steps.

[0020] The detection device is connected to the circuit to be detected; the detection device is the intermediate relay energizing state detection device described in the first aspect, the input end of the intermediate relay energizing state detection device is respectively connected to multiple intermediate relays, the output end of the intermediate relay energizing state detection device is connected to the input end of the controller, and the output end of the controller is respectively connected to multiple intermediate relays.

[0021] The detection device is used to detect the level changes of each KA point and the level changes of the Y point in real time. When the level of one of the KA points changes and the level of the Y point does not change or the level change time exceeds a threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is abnormal, and the abnormal result is fed back to the controller; when the level of one of the KA points changes and the Y point also undergoes a corresponding level change and the level change time is less than or equal to the threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is normal; the level change includes a high level changing to a low level or a low level changing to a high level.

[0022] According to the specific embodiments provided in this application, this application discloses the following technical effects.

[0023] The present application provides an intermediate relay closure state detection device and method, by setting a relay input circuit and a state output circuit, and connecting each KA point in the relay input circuit to a normally open contact of an intermediate relay, and connecting the Y point in the state output circuit to the input end of the controller. The MCU chip detects the level changes of each KA point and the level changes of the Y point in real time. Once a certain KA point changes in level, it indicates that the controller is controlling the intermediate relay connected to the KA point. If the Y point does not change in level or the level change time is greater than the threshold, it is determined that the closure state of the intermediate relay corresponding to the KA point is abnormal, and if the Y point changes in level and the level change time is less than or equal to the threshold, it is determined that the closure state of the intermediate relay corresponding to the KA point is normal. The present application only needs to connect a Y point to the controller input end, and there is no need to connect the normally open contacts of all the intermediate relays to the controller input end, so that the number of input points of the controller will not be occupied too much, the circuit structure is simplified, the circuit is simpler, and it is more convenient to use. It can quickly and effectively detect and identify whether the closure state of the intermediate relay is normal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The figure is a schematic diagram of the structure of an existing intermediate relay.

[0026] Figure 2 A circuit structure diagram of an intermediate relay energized state detection device provided in one embodiment of the present application.

[0027] Figure 3 An overall circuit diagram of a PLC-based intermediate relay energizing state detection device provided in one embodiment of the present application.

[0028] Figure 4 A flowchart of a method for detecting the energized state of an intermediate relay provided in one embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Figure 1 The internal structure of a common intermediate relay is shown, where 10 / 11 is the control contact of the intermediate relay, relay is the control coil of the intermediate relay, and the state display diode is above. These together constitute the control circuit of the intermediate relay, 1 / 4 is the normally closed point, and 1 / 7 is the normally open point. The working principle of the intermediate relay is as follows: 10 / 11 is energized, the coil relay is energized, and the coil relay generates current. The current in the coil relay generates a magnetic field in the iron core. The magnetic field will attract the control contact, causing 1 / 4 to disconnect and 1 / 7 to close, thereby achieving control of the circuit. 10 / 11 is de-energized, the coil relay is de-energized, the magnetic field disappears, and the control contact returns to its original state under the action of the spring.

[0031] When a controller such as a PLC uses an intermediate relay to control the start of an electrical device, the control contacts 10 and 11 are respectively connected to the output terminal Q0.0 of the PLC (taking Q0.0 as an example) and the 24V+ power supply, and 1 / 7 is connected to the start point of the electrical device. When 1 / 7 is connected, the controlled electrical device starts; when 1 / 7 is disconnected, the controlled electrical device stops. During control, when the output of Q0.0 is 1, the coil relay of the intermediate relay is energized, and the states of 1 / 7, 2 / 8, and 3 / 9 change from disconnection to attraction, and the state changes from 0 to 1, and the electrical device starts; when the output of Q0.0 is 0, the coil relay of the intermediate relay loses power, and the states of 1 / 7, 2 / 8, and 3 / 9 change from attraction to disconnection, and the state changes from 1 to 0, and the electrical device stops. The start and stop of the equipment are controlled at the same time. Due to the humidity in the underground environment, the intermediate relay may be stuck, causing the coil of the intermediate relay to lose power when the output of Q0.0 changes from 1 to 0. 1 / 7 cannot trip due to adhesion, so 1 / 7 is still energized at this time. Due to the physical connection, 2 / 8 and 3 / 9 will also be energized, causing the electrical equipment to be unable to stop, and then lose the control function, which will seriously damage the equipment. Table 1 shows the health status and system status of the intermediate relay under different on-off conditions.

[0032] Table 1 Health status of intermediate relay and system status under different on-off conditions

[0033]

[0034] Because the intermediate relays used underground have a technical problem that the control contacts of the intermediate relays are stuck and cannot be tripped due to the humid underground environment, resulting in the inability to effectively control the electrical equipment. Therefore, for important intermediate relays, the status of 2 / 8 or 2 / 9 is currently fed back to the input point of the controller in real time, and the status of 2 / 8 or 2 / 9 is detected to determine whether the intermediate relay is normally energized. However, taking the mine water pump control system as an example, this method needs to control two electric gate valves and a water pump in the mine water pump control system, which requires at least 6 important intermediate relays, which requires 6 groups of status feedback to be connected to the controller, which will squeeze the number of input points of the controller.

[0035] Based on this, the present embodiment aims to propose a new intermediate relay energizing state detection device and method to simplify the circuit structure, make it more convenient to use, and can quickly and effectively detect whether the energizing state of the intermediate relay is normal without occupying too many input points of the controller.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] like Figure 2As shown, this embodiment proposes an intermediate relay energizing state detection device, the input end of the intermediate relay energizing state detection device is respectively connected to multiple intermediate relays, the output end of the intermediate relay energizing state detection device is connected to the input end of the controller, the output end of the controller is respectively connected to multiple intermediate relays, and the intermediate relay energizing state detection device is used to detect whether the energizing state of each intermediate relay is normal under the control of the controller.

[0038] The intermediate relay energizing state detection device proposed in this embodiment mainly includes an MCU (Microcontroller Unit) chip, a relay input circuit, a state output circuit, and a power supply circuit, wherein the MCU chip, as the core of the intermediate relay energizing state detection device, is connected to the relay input circuit and the state output circuit respectively. The power supply circuit is connected to the MCU chip, the relay input circuit, and the state output circuit respectively. The power supply circuit is used to supply power to the MCU chip, the relay input circuit, and the state output circuit respectively.

[0039] In this embodiment, the relay input circuit includes a plurality of KA points, and each KA point corresponds to a normally open contact of an intermediate relay. For example, the relay input circuit can be a 16-way relay input circuit, and the 16-way relay input circuit corresponds to 16 KA points, namely KA1, KA2, KA3, KA4, KA5, KA6, KA7, KA8, KA9, KA10, KA11, KA12, KA13, KA14, KA15 and KA16.

[0040] In this embodiment, the state output circuit includes a Y point, and the Y point is connected to the input end of the controller.

[0041] In this embodiment, the relay input circuit further includes a COM1 point, and the status output circuit further includes a COM2 point. Both the COM1 point and the COM2 point are universal serial communication points.

[0042] In this embodiment, the MCU chip is mainly used to detect the level changes of each KA point and the level changes of the Y point in real time. The level changes include the change of high level to low level or the change of low level to high level. Then, according to the level changes of each KA point and the level changes of the Y point, it is determined whether the pull-in state of the corresponding intermediate relay fails. The judgment method mainly includes the following two methods.

[0043] (1) When the level of a certain KA point changes, and the level of the Y point does not change or the level change time exceeds the threshold, it is determined that the contact state of the intermediate relay corresponding to the KA point is abnormal, and the abnormal result is fed back to the controller so that the controller can issue a warning in time, so as to remind the underground engineer to find the cause and repair it in time.

[0044] (2) When the level of a certain KA point changes, the level of the Y point also changes accordingly and the level change time is less than or equal to the threshold, it is determined that the contact state of the intermediate relay corresponding to the KA point is normal.

[0045] In this embodiment, the threshold can be set to 1 second. By comparing the relationship between the level change time of point Y and the threshold, when the level change time of point Y is greater than 1 second, it can be confirmed that the attraction state of the intermediate relay is abnormal, its contacts do not respond immediately, and the contacts may be stuck.

[0046] In order to make the technical solution of this embodiment clearer, the specific structure and detailed implementation steps of the technical solution of this embodiment are described in detail below in the form of examples.

[0047] The intermediate relay closure state detection device in this embodiment mainly includes a power supply circuit, a relay input circuit and a state output circuit. The power supply circuit is connected to the relay input circuit and the state output circuit respectively. The power supply circuit, the relay input circuit and the state output circuit are also connected to the MCU chip. The power supply circuit is a 24V to 3.3V circuit to provide a 3.3V power supply for the MCU chip. The model of the power supply circuit in this embodiment is RT6208, which is a synchronous buck DC / DC converter. Its essence is a Buck (step-down conversion) circuit. Its technical principle is: the feedback comparator in the synchronous buck DC / DC converter uses a reference voltage of 800mV and has a hysteresis value of 5mV. When the feedback signal voltage appearing at the FB (feedback input reference voltage) terminal is more than 5mV lower than the internal reference voltage, the internal upper bridge MOSFET (Metal Oxide Semiconductor Field-Effect Transistor) switch is turned on, so that the inductor current begins to increase. When this current increases to exceed the set internal maximum current limit, the upper MOSFET switch is turned off and the lower MOSFET switch is turned on, after which the inductor current will gradually drop to zero. During this process, the current flowing out of the inductor will charge the output capacitor and increase its voltage. The final result of this repeated process is that the feedback voltage at the FB terminal is greater than the 800mV reference voltage. After that, the upper MOSFET switch and the lower MOSFET switch will all be turned off after the inductor current drops to zero, and the synchronous buck DC / DC converter enters a low current consumption sleep state. The output voltage in the sleep state is maintained only by the energy stored in the output capacitor and gradually decreases due to the consumption of the load. When the feedback voltage at the FB terminal is lower than the reference voltage by 5mV, the upper MOSFET switch is turned on again to replenish the energy at the output terminal, and the above cycle is repeated.

[0048] In this embodiment, the relay input circuit includes KA1 point, KA2 point, KA3 point, KA4 point, KA5 point, KA6 point, KA7 point, KA8 point, KA9 point, KA10 point, KA11 point, KA12 point, KA13 point, KA14 point, KA15 point, KA16 point and COM1 point, wherein KA1~KA16 points are intermediate relay access points for connecting intermediate relays, and the specific intermediate relays to be connected can be determined according to actual needs, and up to 16 intermediate relays can be connected. COM1 point is a universal serial communication point. The relay input circuit is used to capture the status of each input pin such as KA1~KA16 points and COM1 point, and the state of the measurement pin is captured by reading the level relationship between KA1~KA16 points and COM1 point, combined with the input capture function of the MCU chip.

[0049] In this embodiment, the state output circuit includes a Y point and a COM2 point, wherein the Y point is used as an output point to compare the output level to realize the function of state feedback, and the COM2 point is a universal serial communication point. The state output circuit is used to feedback the pull-in state of each intermediate relay to the controller and feed back the abnormal result to the controller. When the level between the KA1~KA16 point and the COM1 point changes, the level of the Y point of the state output circuit also changes immediately. This embodiment adopts a reversed design. When the level of the KA point corresponding to a certain intermediate relay changes, the level state of the Y point will be reversed, that is, if the KA point changes from a high level to a low level, the Y point will change from a low level to a high level; if the KA point changes from a low level to a high level, the Y point will change from a high level to a low level, and the two are opposite. The controller can realize the function of state feedback based on the comparison of the level state of its output end and the Y point. In actual use, you only need to connect the normally open contact of each intermediate relay to the KA1~KA16 points and the COM1 point. The MCU chip will scan the level status of each KA point and determine whether the level changes. When the level of the KA point corresponding to a certain intermediate relay changes, the level status of the Y point will be reversed, thereby realizing real-time feedback of the contact closure status of the intermediate relay between the status output circuit and the controller.

[0050] The present application also provides an application scenario, which applies the above-mentioned intermediate relay energizing state detection device to form a complete PLC-based intermediate relay energizing state detection device. Figure 3 As shown, Figure 3The detection device in the above refers to the intermediate relay energizing state detection device, and the controller is a PLC. Taking three intermediate relays as an example, the output terminals of the PLC are Q0.0, Q0.1 and Q0.2, which are respectively connected to the three intermediate relays KA1, KA2 and KA3. The KA1 point, KA2 point and KA3 point in the relay input circuit of the intermediate relay energizing state detection device are respectively connected to the normally open contacts of the three intermediate relays KA1, KA2 and KA3, that is, the normally open contacts of the KA1 switch, KA2 switch and KA3 switch, which are used to control the on-off state of the three intermediate relays KA1, KA2 and KA3. At the same time, the Y point in the state output circuit of the intermediate relay energizing state detection device is connected to the input terminal I0.0 of the PLC.

[0051] In actual use, by setting all Q points of Q0.0, Q0.1 and Q0.2 to 1, the KA points such as KA1 switch, KA2 switch and KA3 switch corresponding to the three intermediate relays are energized. In a conventional downhole control system, after the Q point output is disconnected, there may still be contact adhesion, resulting in the inability to effectively monitor whether the intermediate relay is operating normally. Generally, the corresponding KA point is assumed to be disconnected. In this embodiment, it is only necessary to connect a group of normally open contacts of the intermediate relay to be detected to the KA point and the COM1 point of the detection device, and connect the Y point of the detection device to the input terminal I0.0 of the PLC. Because when the level of any one of the KA1~KA16 points of the detection device changes, the output level of the Y point will also be reversed. At the same time, the PLC knows the output state of its own Q point. If the control program of the PLC controls a certain Q point and thus controls the corresponding intermediate relay, and the Y point does not change its level, for example, the high level changes to the low level or the low level changes to the high level, or the level change time is too slow, for example, the level change time is 2 seconds, and 2 seconds is greater than the threshold value of 1 second, it can be regarded as the level change time is too slow. At this time, it can be judged that the intermediate relay corresponding to the Q point has a fault, its suction state is abnormal, and there may be contact adhesion. The fault is fed back to the PLC in time so that the PLC can immediately issue a warning.

[0052] When judging the energized state of an intermediate relay, the conventional intermediate relay energized state detection method needs to connect a normally open contact of the intermediate relay to the input of the PLC. If there are 16 intermediate relays, all 16 normally open contacts need to be connected to the input of the PLC, which occupies a large number of input points of the PLC input terminal and makes the circuit connection relationship more complicated. However, in this embodiment, whether it is to detect the energized state of 8, 16 or 32 intermediate relays, it is only necessary to set a corresponding number of KA points and connect a Y point to the input terminal of the PLC. It is not necessary to connect a large number of normally open contacts to the input terminal of the PLC, thereby simplifying the circuit structure, and not occupying the number of input points of the PLC input terminal. It is more convenient and quick to use, and at the same time, the change of the energized state of each intermediate relay can be clearly and accurately determined. Since the change of the energized state of the intermediate relay only includes two states of connection and disconnection, it can be combined with the output of the PLC. It is only necessary to detect the energized state of the intermediate relay according to whether the output level of the Y point changes, and judge whether the intermediate relay works normally.

[0053] In an exemplary embodiment, Figure 4 As shown, a method for detecting the energized state of an intermediate relay is provided. The method is based on a device for detecting the energized state of an intermediate relay and specifically includes the following steps.

[0054] Step S1, connecting the detection device to the circuit to be detected; the detection device is an intermediate relay energized state detection device, the input end of the intermediate relay energized state detection device is respectively connected to multiple intermediate relays, the output end of the intermediate relay energized state detection device is connected to the input end of the controller, and the output end of the controller is respectively connected to multiple intermediate relays.

[0055] Step S2, using the detection device to detect the level changes of each KA point and the level changes of the Y point in real time. When a level change occurs at a certain KA point and the level change does not occur at the Y point or the level change time exceeds the threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is abnormal, and the abnormal result is fed back to the controller; when a level change occurs at a certain KA point, the Y point also undergoes a corresponding level change and the level change time is less than or equal to the threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is normal; the level change includes a high level changing to a low level or a low level changing to a high level.

[0056] In actual application, the complete implementation steps of the intermediate relay energized state detection method are as follows.

[0057] (1) Connect the normally open contacts corresponding to several intermediate relays to be tested to the KA1~KA16 points and COM1 point of the intermediate relay closure state detection device respectively.

[0058] (2) Connect the Y point of the intermediate relay closure status detection device to the input terminal I0.0 of the PLC.

[0059] (3) When the PLC control program is used to control a certain output terminal Q point, and then control one of the 16 intermediate relays, the intermediate relay will be energized. If the intermediate relay energization status detection device changes the level at any of the points KA1 to KA16, the output level of the Y point will also be reversed.

[0060] (4) If it is detected that the output level at point Y has not changed, or the level changes too slowly, for example, more than 1 second, it can be determined that the intermediate relay corresponding to point Q has a fault, and the fault is fed back to the PLC in time so that the PLC can issue a warning.

[0061] When judging the energized state of the intermediate relay in this embodiment, it is only necessary to connect point Y to the input of the PLC, without connecting a large number of normally open contacts to the input of the PLC, and only one output IO corresponding to point Y is needed to judge the output fault state of the intermediate relay circuit of 8 or even 16 circuits. The judgment of the output fault state can be completed through the minimum number of output IOs, which simplifies the circuit structure and does not occupy the number of input points of the PLC. It is more convenient and quick to use and improves the detection efficiency. According to the actual application scenarios and control conditions of the intermediate relay, the energized state of each control contact of the intermediate relay can be judged with the minimum cost and the minimum number, so as to judge whether the working state of the whole system is normal.

[0062] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A device for detecting the energized state of an intermediate relay, characterized in that: The input end of the intermediate relay energizing state detection device is respectively connected to a plurality of intermediate relays, the output end of the intermediate relay energizing state detection device is connected to the input end of the controller, the output end of the controller is respectively connected to a plurality of the intermediate relays, and the intermediate relay energizing state detection device is used to detect whether the energizing state of each intermediate relay is normal under the control of the controller; the intermediate relay energizing state detection device comprises an MCU chip, a relay input circuit and a state output circuit, and the MCU chip is respectively connected to the relay input circuit and the state output circuit; the controller is a PLC; The relay input circuit includes a plurality of KA points, each of which is connected to a normally open contact of the intermediate relay; The relay input circuit is a 16-way relay input circuit, and the relay input circuit also includes a COM1 point; The state output circuit includes a Y point, and the Y point is connected to the input end of the controller; the state output circuit also includes a COM2 point; The MCU chip is used to detect the level changes of each KA point and the level changes of the Y point in real time. When the level of one of the KA points changes and the level of the Y point does not change or the level change time is greater than a threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is abnormal, and the abnormal result is fed back to the controller; when the level of one of the KA points changes and the Y point also undergoes a corresponding level change and the level change time is less than or equal to the threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is normal; the level change includes a high level changing to a low level or a low level changing to a high level.

2. The intermediate relay energizing state detection device according to claim 1, characterized in that: The intermediate relay closure state detection device also includes a power supply circuit, which is respectively connected to the MCU chip, the relay input circuit and the state output circuit, and is used to supply power to the MCU chip, the relay input circuit and the state output circuit respectively.

3. The intermediate relay energizing state detection device according to claim 2, characterized in that: The power supply circuit includes a synchronous step-down DC / DC converter.

4. The intermediate relay energizing state detection device according to claim 1, characterized in that: The 16-way relay input circuit includes KA1 point, KA2 point, KA3 point, KA4 point, KA5 point, KA6 point, KA7 point, KA8 point, KA9 point, KA10 point, KA11 point, KA12 point, KA13 point, KA14 point, KA15 point and KA16 point.

5. The intermediate relay energizing state detection device according to claim 1, characterized in that: The threshold is 1 second.

6. A method for detecting the energized state of an intermediate relay, characterized in that: The intermediate relay energizing state detection method comprises: Connecting the detection device to the circuit to be detected; the detection device is the intermediate relay energized state detection device according to claim 1, the input end of the intermediate relay energized state detection device is respectively connected to a plurality of intermediate relays, the output end of the intermediate relay energized state detection device is connected to the input end of the controller, and the output end of the controller is respectively connected to the plurality of intermediate relays; The detection device is used to detect the level changes of each KA point and the level changes of the Y point in real time. When the level of one of the KA points changes and the level of the Y point does not change or the level change time is greater than a threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is abnormal, and the abnormal result is fed back to the controller; when the level of one of the KA points changes and the Y point also undergoes a corresponding level change and the level change time is less than or equal to the threshold, it is determined that the pull-in state of the intermediate relay corresponding to the KA point is normal; the level change includes a high level changing to a low level or a low level changing to a high level.

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