A detection system for a control circuit of an isolating switch in a power system

Abstract

The embodiment of the present invention provides a detection system for the control circuit of an isolating switch in an electric power system, comprising: a detection circuit, a warning circuit and a repair circuit; the detection circuit and the repair circuit are connected, and the repair circuit is connected in parallel with the warning circuit; the detection circuit is used to detect whether there is a pressure difference between the two ends of an auxiliary contact to be detected in the control circuit, obtain a detection result, and trigger the warning circuit to perform a warning action when the detection result is that there is a pressure difference between the two ends of the auxiliary contact to be detected; the repair circuit is used to perform a fault repair action based on a trigger instruction issued by a staff member after the warning circuit performs the warning action. The present invention solves the technical problem that in the prior art, when the auxiliary contacts of various devices in the control circuit of the isolating switch in an electric power system fail, the staff can only rely on measuring the fault point section by section to find the fault point, which results in a long time consumption and increased risk of power grid operation.

Description

Technical Field

[0001] The invention relates to the technical field of power systems, and in particular to a detection system for a control circuit of an isolating switch in a power system. Background Art

[0002] In the locking control circuit of the disconnector of the power system, the disconnector cannot be opened or closed because the auxiliary contacts of the circuit breaker or disconnector are not in place or damaged. When the disconnector cannot be opened or closed, it can only be opened or closed manually, which takes a long time and has high operation risks, prolonging the power outage and power supply time of the line, thereby increasing the risk of power grid operation. At the same time, since the fault point is not clear, when the staff go to the site to find the fault point, they need to measure the auxiliary contacts of each circuit breaker or disconnector in the control circuit section by section, which is not only time-consuming but also increases the workload of the staff.

[0003] There is no effective solution to the above problems yet. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a detection system for the control circuit of an electric power system isolating switch, so as to solve the technical problems in the prior art that when the auxiliary contacts of each device in the control circuit of the electric power system isolating switch fail, the staff can only rely on measuring section by section to find the fault point, which results in a long time consumption and increased risk of power grid operation.

[0005] According to an embodiment of the present invention, a detection system for a control circuit of an isolating switch in an electric power system is provided, the detection system comprising: a detection circuit, a warning circuit and a repair circuit; the detection circuit is connected to the repair circuit, and the repair circuit is connected in parallel with the warning circuit; the detection circuit is used to detect whether there is a pressure difference between the two ends of an auxiliary contact to be detected in the control circuit, obtain a detection result, and trigger the warning circuit to perform a warning action when the detection result is that there is a pressure difference between the two ends of the auxiliary contact to be detected; the repair circuit is used to perform a fault repair action based on a trigger instruction issued by a staff member after the warning circuit performs the warning action.

[0006] Furthermore, the detection circuit includes: an overvoltage relay, a first actuator of a current relay; the overvoltage relay is connected in parallel to the two ends of the auxiliary contact to be detected; the first actuator of the current relay is connected in parallel to the two ends of the auxiliary contact to be detected; the positive end of the auxiliary contact to be detected is connected to the positive end of the power supply of the control circuit, and the negative end of the auxiliary contact to be detected is connected to the negative end of the power supply of the control circuit.

[0007] Furthermore, the overvoltage relay is used to detect whether there is a pressure difference between the two ends of the auxiliary contact to be detected to obtain the detection result; the first actuator of the current relay is used to perform a closing action when the current relay is actuated.

[0008] Furthermore, the overvoltage relay in the detection circuit is connected in parallel to two ends of the auxiliary contact to be detected through leads.

[0009] Furthermore, the warning circuit includes: an actuator of a dual-position relay and an alarm light; the actuator of the dual-position relay and the alarm light are connected in series; and the alarm light is a red alarm light.

[0010] Furthermore, the actuator of the two-position relay is used to close after the first path of the two-position relay is turned on, controlling the warning circuit to be turned on; the warning light is used to perform the warning action after the warning circuit is turned on, wherein the warning action is that the warning light becomes brighter.

[0011] Furthermore, the repair circuit includes: a repair control switch, a current relay, a second actuator of the current relay, an actuator of an overvoltage relay, and a double-position relay; the first end of the repair control switch is connected to the positive end of the power supply of the detection system, and the second end of the repair control switch is connected to the first end of the current relay; the second actuator of the current relay is connected in parallel with the repair control switch; the first end of the actuator of the overvoltage relay is connected to the positive end of the power supply of the detection system, and the second end of the actuator of the overvoltage relay is connected to the first end of the double-position relay; the third end and the fourth end of the double-position relay are both connected to the negative end of the power supply of the detection system.

[0012] Furthermore, the actuator of the overvoltage relay is used to trigger the overvoltage relay to power on when there is a pressure difference across the auxiliary contact to be detected, wherein after the overvoltage relay is powered on, the actuator of the overvoltage relay is closed to conduct the first path of the two-position relay; the current relay is used to trigger the second actuator of the current relay to perform a corresponding action after the repair control switch is triggered.

[0013] Furthermore, the repair circuit also includes: a break contact and a reset control switch; the first end of the break contact is connected to the second end of the current relay, and the second end of the break contact is connected to the negative end of the power supply of the detection system; the first end of the reset control switch is connected to the positive end of the power supply of the detection system, and the second end of the reset control switch is connected to the second end of the two-position relay; the reset control switch is used to turn on the second path of the two-position relay after being triggered; the break contact is used to disconnect the power supply of the detection system after the reset control switch is triggered.

[0014] Furthermore, in the case where there are multiple auxiliary contacts to be detected, there are multiple detection circuits, warning circuits and repair circuits, and the auxiliary contacts to be detected are respectively arranged in one-to-one correspondence with the detection circuits, the warning circuits and the repair circuits.

[0015] The embodiment of the present invention provides a detection system for the control circuit of an isolating switch in an electric power system, comprising: a detection circuit, a warning circuit and a repair circuit; the detection circuit and the repair circuit are connected, and the repair circuit is connected in parallel with the warning circuit; the detection circuit is used to detect whether there is a pressure difference between the two ends of an auxiliary contact to be detected in the control circuit, obtain a detection result, and trigger the warning circuit to perform a warning action when the detection result is that there is a pressure difference between the two ends of the auxiliary contact to be detected; the repair circuit is used to perform a fault repair action based on a trigger instruction issued by a staff member after the warning circuit performs the warning action. The present invention solves the technical problem that in the prior art, when the auxiliary contacts of various devices in the control circuit of the isolating switch in an electric power system fail, the staff can only rely on measuring the fault point section by section to find the fault point, which results in a long time consumption and increased risk of power grid operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a circuit diagram of a detection circuit provided according to an embodiment of the present invention;

[0018] Figure 2 is a circuit diagram of a warning circuit provided according to an embodiment of the present invention;

[0019] Figure 3 is a circuit diagram of a repair circuit provided according to an embodiment of the present invention;

[0020] Figure 4 is a circuit diagram of a detection circuit when there are multiple auxiliary contacts to be detected according to an embodiment of the present invention;

[0021] Figure 5 The invention provides a circuit diagram in which a warning circuit and a repair circuit are connected in parallel when there are multiple auxiliary contacts to be detected according to an embodiment of the invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] According to an embodiment of the present invention, a detection system for a control circuit of an isolating switch in an electric power system is provided, wherein the detection system for the control circuit of the isolating switch in an electric power system comprises: a detection circuit, a warning circuit and a repair circuit; the detection circuit and the repair circuit are connected, and the repair circuit is connected in parallel with the warning circuit.

[0024] Specifically, the detection circuit is used to detect whether there is a pressure difference at both ends of the auxiliary contact to be detected in the control loop, obtain the detection result, and when the detection result is that there is a pressure difference at both ends of the auxiliary contact to be detected, trigger the warning circuit to perform a warning action; the repair circuit is used to perform a fault repair action based on the trigger instruction issued by the staff after the warning circuit executes the warning action.

[0025] The embodiment of the present invention provides a detection system for the control circuit of an isolating switch in an electric power system, comprising: a detection circuit, a warning circuit and a repair circuit; the detection circuit and the repair circuit are connected, and the repair circuit is connected in parallel with the warning circuit; the detection circuit is used to detect whether there is a pressure difference between the two ends of an auxiliary contact to be detected in the control circuit, obtain a detection result, and trigger the warning circuit to perform a warning action when the detection result is that there is a pressure difference between the two ends of the auxiliary contact to be detected; the repair circuit is used to perform a fault repair action based on a trigger instruction issued by a staff member after the warning circuit performs the warning action. The present invention solves the technical problem that in the prior art, when the auxiliary contacts of various devices in the control circuit of the isolating switch in an electric power system fail, the staff can only rely on measuring the fault point section by section to find the fault point, which results in a long time consumption and increased risk of power grid operation.

[0026] Figure 1 is a circuit diagram of a detection circuit provided according to an embodiment of the present invention.

[0027] In an alternative embodiment, if Figure 1As shown, the detection circuit includes: an overvoltage relay KV and a first actuator KM-1 of a current relay.

[0028] Specifically, the overvoltage relay KV is connected in parallel at both ends of the auxiliary contact Q to be detected; the first actuator KM-1 of the current relay is connected in parallel at both ends of the auxiliary contact Q to be detected; the positive end of the auxiliary contact Q to be detected is connected to the positive end of the power supply of the control circuit, and the negative end of the auxiliary contact Q to be detected is connected to the negative end of the power supply of the control circuit.

[0029] Specifically, the overvoltage relay KV is used to detect whether there is a voltage difference between the two ends of the auxiliary contact Q to be detected, and obtain a detection result; the first actuator KM-1 of the current relay is used to perform a closing action when the current relay is actuated.

[0030] Specifically, the overvoltage relay KV in the detection circuit 1 is connected in parallel to both ends of the auxiliary contact Q to be detected through leads.

[0031] Figure 2 is a circuit diagram of a warning circuit provided according to an embodiment of the present invention.

[0032] In another optional embodiment, Figure 2 As shown, the warning circuit includes: the actuator YQJ-1 of the double-position relay and the warning light HD; the actuator YQJ-1 of the double-position relay and the warning light HD are connected in series; the warning light HD is a red warning light.

[0033] Specifically, the actuator YQJ-1 of the two-position relay is used to close after the first path of the two-position relay is turned on, controlling the warning circuit to be turned on; the warning light HD is used to perform a warning action after the warning circuit 20 is turned on, wherein the warning action is that the warning light HD becomes brighter.

[0034] In the embodiment of the present invention, when the actuator of the two-position relay performs the closing action, the warning circuit is turned on, and the alarm light will perform the alarm action, that is, the alarm light will turn on. It should be noted that the alarm light will be on for a long time to warn the staff that there is a fault here, until the staff presses the reset control switch to turn on the second path of the two-position relay, so that the actuator of the two-position relay is reset, and then the alarm light will go out.

[0035] Figure 3 is a circuit diagram of a repair circuit provided according to an embodiment of the present invention.

[0036] In an optional embodiment, if Figure 3 As shown, the repair circuit includes: a repair control switch QK, a current relay KM, a second actuator KM-2 of the current relay, an actuator KV-1 of the overvoltage relay, and a two-position relay YQJ.

[0037] Specifically, the first end of the repair control switch QK is connected to the positive end of the power supply of the detection system, and the second end of the repair control switch QK is connected to the first end of the current relay KM; the second actuator KM-2 of the current relay is connected in parallel with the repair control switch QK; the first end of the actuator KV-1 of the overvoltage relay is connected to the positive end of the power supply of the detection system, and the second end of the actuator KV-1 of the overvoltage relay is connected to the first end of the double position relay YQJ; the third end and the fourth end of the double position relay YQJ are both connected to the negative end of the power supply of the detection system.

[0038] Specifically, Figure 3 As shown, a diode D1 is connected in parallel to the first path of the two-position relay YQJ, and a diode D2 is connected in parallel to the second path of the two-position relay YQJ. The function of the diodes D1 and D2 is to prevent damage to the two-position relay YQJ due to reverse power supply.

[0039] The specific working principle of the above detection system is introduced below with a specific embodiment.

[0040] In the embodiment of the present invention, Figure 1 , Figure 2 , Figure 3 As shown in , when the auxiliary contact Q to be detected of the component in the control circuit of the power system disconnector works normally, the voltages at both ends of the auxiliary contact Q to be detected are the same and there is no voltage difference. Then, there is no voltage difference at both ends of the corresponding overvoltage relay KV connected in parallel with it, and the warning circuit and the repair circuit will not operate.

[0041] When the auxiliary contact Q to be detected has poor contact, a pressure difference will appear at its two ends, and a corresponding pressure difference will also appear at the two ends of the overvoltage relay KV connected in parallel with it, that is, the detection result is that the detection circuit detects that there is a pressure difference at the two ends of the auxiliary contact Q to be detected in the control loop. At this time, due to the pressure difference at both ends of the overvoltage relay KV, the actuator KV-1 of the overvoltage relay in the repair circuit is closed, so that the first path of the two-position relay YQJ is turned on. When the first path of the two-position relay YQJ is turned on, the actuator YQJ-1 of the two-position relay in the warning circuit is closed, the warning circuit is turned on, and the alarm light HD begins to light up and alarm, prompting the staff of the relevant power system that a fault has occurred here. At this point, the detection system provided by the present invention completes the detection and alarm functions of the auxiliary contacts to be detected in the control loop.

[0042] When the staff of the relevant power system receives the alarm prompt, they actively close the repair control switch QK in the repair circuit. After the repair control switch QK is closed, the current relay KM is energized, and the first actuator KM-1 of the current relay in the detection circuit performs a closing action, thereby short-circuiting the two ends of the auxiliary contact Q to be detected, so that the control circuit is reconnected, that is, "repairing" the poor contact problem of the auxiliary contact Q to be detected. At the same time, the second actuator KM-2 of the current relay in the repair circuit performs a closing action, short-circuiting the repair control switch QK. At this point, the detection system provided by the present invention completes the repair function of the auxiliary contact to be detected in the control circuit.

[0043] In another optional embodiment, Figure 3 As shown, the repair circuit also includes: a break contact K and a reset control switch QK-1; the first end of the break contact K is connected to the second end of the current relay KM, and the second end of the break contact K is connected to the negative power end of the power supply of the detection system; the first end of the reset control switch QK-1 is connected to the positive power end of the power supply of the detection system, and the second end of the reset control switch QK-1 is connected to the second end of the two-position relay YQJ.

[0044] Specifically, the reset control switch QK-1 is used to connect the second path of the two-position relay YQJ after being triggered; the break contact K is used to disconnect the power supply of the connection detection system after the reset control switch YQJ is triggered.

[0045] In the embodiment of the present invention, after the detection system completes the above-mentioned "repair" action, the alarm light remains in a long-on state. After the staff of the relevant power system closes the reset control switch QK-1, the second path of the double-position relay YQJ is turned on. At this time, the actuator YQJ-1 of the double-position relay in the warning circuit is reset, so that the warning circuit is disconnected and the alarm light goes out. At the same time, the moving contact K in the repair circuit performs a disconnection action to ensure that the power supply of the detection system is disconnected. At this point, the entire detection system completes a detection, warning, repair and reset action.

[0046] Optionally, when there are multiple auxiliary contacts to be detected, there are multiple detection circuits, warning circuits and repair circuits, and the auxiliary contacts to be detected are respectively arranged in one-to-one correspondence with the detection circuits, warning circuits and repair circuits.

[0047] Figure 4 4 is a circuit diagram of a detection circuit when there are multiple auxiliary contacts to be detected according to an embodiment of the present invention.

[0048] Figure 5 The invention provides a circuit diagram in which a warning circuit and a repair circuit are connected in parallel when there are multiple auxiliary contacts to be detected according to an embodiment of the invention.

[0049] like Figure 4 As shown, when there are multiple auxiliary contacts to be detected, that is, Figure 4 The auxiliary contacts Q1, Q2, ..., Qn to be detected are shown, each of which corresponds to a detection circuit, and the multiple detection circuits are connected.

[0050] like Figure 5 As shown, when there are multiple auxiliary contacts to be detected, each auxiliary contact to be detected is correspondingly provided with a warning circuit and a repair circuit, and the warning circuit and the repair circuit of one auxiliary contact to be detected are connected in parallel with the warning circuit and the repair circuit of another auxiliary contact to be detected.

[0051] In the embodiment of the present invention, when there are two or more auxiliary contacts in the control circuit that are in poor contact, that is, when there are two or more fault points, the detection system of the control circuit of the power system disconnector can also accurately determine the locations of multiple fault points. The specific judgment principle is as follows:

[0052] Assuming that the auxiliary contacts of the second and fifth devices in the control loop have poor contact or are disconnected, according to the working principle of the above-mentioned detection system, the second and fifth alarm lights will light up at the same time. At this time, the relevant staff can close the repair control switch in the corresponding repair circuit of the second and fifth auxiliary contacts to perform the repair action; at the same time, assuming that the fourth auxiliary contact originally had poor contact among the second to fifth auxiliary contacts, since the second, fourth, and fifth auxiliary contacts are connected in series, when the second and fifth auxiliary contacts fail, the two ends of the fourth auxiliary contact are disconnected from the power supply, and therefore the fault will not be detected. However, when the faults of the second and fifth auxiliary contacts are "repaired", the two ends of the fourth auxiliary contact are connected, then the fourth alarm light will light up to alarm, while the third alarm light will not light up, because the third auxiliary contact has not failed, and the staff can judge the location of the fault point by the position where the alarm light lights up. At this point, the detection system completes the actions of detecting and warning multiple fault points.

[0053] The detection system for the control circuit of the power system isolation switch provided by the embodiment of the present invention has the following advantages:

[0054] (1) It can accurately locate one or more fault points in the control loop, making it easier for relevant staff to find and solve loop defects in a timely manner, thereby improving work efficiency;

[0055] (2) During the opening and closing operation of the isolating switch, if the auxiliary contacts of the relevant equipment in the control circuit are not in place, the detection system proposed by the present invention can be used to automatically repair them, thereby reducing the operation time increased by the isolating switch operation failure, improving work efficiency, and reducing the risk of power grid operation;

[0056] (3) Since the fault can be repaired by the detection system proposed in the present invention, the effect of electric operation can be achieved at a remote location, avoiding the risks brought by the staff operating by manually opening and closing the switch, thereby reducing the risk of human operation and ensuring personal safety.

[0057] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0059] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0060] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0061] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0062] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0063] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0064] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A detection system for a control circuit of an isolating switch in a power system, characterized in that: The detection system comprises: a detection circuit, a warning circuit and a repair circuit; the detection circuit is connected to the repair circuit, and the repair circuit is connected in parallel with the warning circuit; The detection circuit is used to detect whether there is a pressure difference between the two ends of the auxiliary contact to be detected in the control loop, obtain a detection result, and trigger the warning circuit to perform a warning action when the detection result shows that there is a pressure difference between the two ends of the auxiliary contact to be detected; The repair circuit is used to perform a fault repair action based on a trigger instruction issued by a staff member after the warning circuit performs the warning action; Wherein, the repair circuit includes: a repair control switch, a current relay, a second actuator of the current relay, an actuator of the overvoltage relay, and a dual-position relay; The first end of the repair control switch is connected to the positive terminal of the power supply of the detection system, and the second end of the repair control switch is connected to the first end of the current relay; The second actuator of the current relay is connected in parallel with the repair control switch; A first end of the actuator of the overvoltage relay is connected to the positive terminal of the power supply of the detection system, and a second end of the actuator of the overvoltage relay is connected to the first end of the two-position relay; The third terminal and the fourth terminal of the two-position relay are both connected to the negative power terminal of the power supply of the detection system; The actuator of the overvoltage relay is used to trigger the overvoltage relay to be powered on when there is a pressure difference between the two ends of the auxiliary contact to be detected, wherein after the overvoltage relay is powered on, the actuator of the overvoltage relay is closed to conduct the first path of the two-position relay; The current relay is used to trigger the second actuator of the current relay to perform a corresponding action after the repair control switch is triggered.

2. The detection system according to claim 1, characterized in that: The detection circuit includes: an overvoltage relay, a first actuator of a current relay; The overvoltage relay is connected in parallel at both ends of the auxiliary contact to be detected; The first actuator of the current relay is connected in parallel to the two ends of the auxiliary contact to be detected; the positive end of the auxiliary contact to be detected is connected to the positive end of the power supply of the control circuit, and the negative end of the auxiliary contact to be detected is connected to the negative end of the power supply of the control circuit.

3. The detection system according to claim 2, characterized in that: The overvoltage relay is used to detect whether there is a pressure difference between the two ends of the auxiliary contact to be detected, and obtain the detection result; The first actuator of the current relay is used to perform a closing action when the current relay is actuated.

4. The detection system according to claim 2, characterized in that: The overvoltage relay in the detection circuit is connected in parallel at two ends of the auxiliary contact to be detected through leads.

5. The detection system according to claim 1, characterized in that: The warning circuit comprises: an actuator of a double-position relay and an alarm light; the actuator of the double-position relay and the alarm light are connected in series; and the alarm light is a red alarm light.

6. The detection system according to claim 5, characterized in that: The actuator of the two-position relay is used to close after the first path of the two-position relay is turned on, so as to control the warning circuit to be turned on; The warning light is used to perform the warning action after the warning circuit is turned on, wherein the warning action is that the warning light becomes brighter.

7. The detection system according to claim 1, characterized in that: The repair circuit further comprises: a break contact and a reset control switch; the first end of the break contact is connected to the second end of the current relay, and the second end of the break contact is connected to the negative power end of the power supply of the detection system; the first end of the reset control switch is connected to the positive power end of the power supply of the detection system, and the second end of the reset control switch is connected to the second end of the two-position relay; The reset control switch is used to conduct the second path of the two-position relay after being triggered; The break contact is used to disconnect the power supply of the detection system after the reset control switch is triggered.

8. The detection system according to claim 1, characterized in that: In the case where there are multiple auxiliary contacts to be detected, there are multiple detection circuits, warning circuits and repair circuits, and the auxiliary contacts to be detected are respectively arranged in one-to-one correspondence with the detection circuits, the warning circuits and the repair circuits.

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