State output circuit of switch device, action state monitoring device and electrical system

Abstract

The disclosure provides a state output circuit of a switching device, an action state monitoring device and an electrical system. The state output circuit comprises a signal isolation unit and a power supply unit. The power supply unit, a contact structure in the switching device and the signal isolation unit are sequentially electrically connected. The signal isolation unit comprises at least two groups of signal isolation sub-units. The power supply unit is used to supply power to the switching device, so that the contact structure is conductive between corresponding contacts when in a closed state. The signal isolation sub-unit is used to be disconnected when the contact structure is in an open state. The signal isolation sub-unit is used to be conductive when the contact structure is in a closed state, so as to synchronously output an electric signal representing the action state of the contact structure through the output ends of different signal isolation sub-units. In the disclosure, the action state of the contact structure is timely and reliably synchronized while the normal working state of the connected preset controller is considered. Meanwhile, the operation process is simplified, and the convenience and rationality of the operation in the actual scene are ensured.

Description

Technical Field

[0001] This disclosure relates to the field of power electronics technology, and in particular to a status output circuit, an operation status monitoring device, and an electrical system for a switching device. Background Technology

[0002] For the status detection of switching equipment (such as contactors) in electrical systems (such as wind power systems), existing status detection schemes are based on circuit structure design. Currently, the common approach is to directly connect the processor in the system to the auxiliary contacts of the switching equipment to achieve status detection. However, this detection scheme cannot guarantee the accuracy of the detection results, thus failing to meet the usage requirements of actual scenarios. Utility Model Content

[0003] The technical problem to be solved by this disclosure is to overcome the defects of the above-mentioned solutions in the prior art and to provide a new type of action determination scheme for switching equipment. While ensuring the timely and reliable operation status of the switching equipment, it can also optimize the connection operation of the preset controller. Specifically, it provides a status output circuit, an operation status monitoring device and an electrical system for the switching equipment.

[0004] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0005] In a first aspect, this disclosure provides a status output circuit for a switching device, the status output circuit including a signal isolation unit and a power supply unit, the power supply unit, the contact structure in the switching device and the signal isolation unit being electrically connected in sequence, the signal isolation unit including at least two sets of signal isolation subunits;

[0006] The power supply unit is used to supply power to the switching device, so that the corresponding contacts of the contact structure are connected when the contact structure is in the closed state.

[0007] The signal isolation subunit is used to disconnect when the contact structure is in an open state;

[0008] The signal isolation subunit is used to conduct when the contact structure is in a closed state, so as to synchronously output an electrical signal characterizing the operating state of the contact structure through the output terminals of different signal isolation subunits.

[0009] In this solution, power is supplied by a power supply unit to ensure that the oxide film of the contact structure can be broken down and conduction is achieved. The signal isolation unit is directly electrically connected to the contact structure to synchronously drive the signal isolation unit to turn on or off. Then, through different output terminals, the signal is synchronously output to the preset controller at the back end. This achieves the goal of ensuring that the preset controller can work normally and that the contact state is synchronized, while also enabling more flexible and convenient connection to the preset controller, effectively simplifying the operation.

[0010] Optionally, each group of signal isolation subunits includes a coupling switch and a first diode. The input terminal of the coupling switch in each group is electrically connected to the contact structure, and the output terminal of the coupling switch in each group is electrically connected to different first diodes. The output terminals of different first diodes are electrically connected to different input terminals of a preset controller. The coupling switch is used to isolate the signal on the input side when it is in the on state.

[0011] In this scheme, each signal isolation subunit includes a coupling switch and a first diode to synchronize the operation state of each signal isolation subunit with that of the contact, ensuring timely and reliable synchronization of the switch operation state.

[0012] Optionally, the signal isolation unit includes two sets of signal isolation sub-units, the coupling switch includes an optocoupler, the optocoupler includes a light-emitting diode and a phototransistor, each light-emitting diode is electrically connected to the contact structure, the output terminal of each phototransistor is electrically connected to the input terminals of the two first diodes respectively, and the collector of each phototransistor is electrically connected to the output terminal of the corresponding first diode and an input terminal of the preset controller.

[0013] In this solution, an optocoupler is used in conjunction with the contacts to ensure timely response to the contact's action state while isolating the input signal to ensure the stability of the backend preset controller.

[0014] Optionally, the signal isolation unit further includes a current-limiting resistor, which is electrically connected between the contact structure and the input terminal of the light-emitting diode.

[0015] In this solution, overcurrent protection is provided for components such as contacts, optocouplers, and the first diode by setting a current-limiting resistor, which avoids damage to the components and ensures the stable operation of the overall circuit.

[0016] Optionally, the status output circuit further includes a second diode, which is electrically connected between the power supply unit and the contact structure;

[0017] In this design, the second diode effectively prevents backflow of current or interference between circuits, thus ensuring the stability of the overall circuit.

[0018] And / or,

[0019] The status output circuit also includes a third diode, which is electrically connected between the power supply unit and the contact structure.

[0020] In this design, the third diode effectively prevents backflow of current or interference between circuits, thus ensuring the stability of the overall circuit.

[0021] And / or,

[0022] The status output circuit also includes a main switch, which is electrically connected between the power supply unit and the coil in the switching device.

[0023] In this design, a main switch is installed in the main circuit to enable more flexible control of the power supply to the entire circuit.

[0024] In a second aspect, this disclosure provides an operating status monitoring device for a switching device, the operating status monitoring device comprising a status output circuit of the switching device as described in the first aspect, and a preset controller electrically connected to the status output circuit.

[0025] In this solution, the status monitoring device includes the aforementioned status output circuit and a preset controller (such as a PLC) to effectively detect the action status of the contact structure while taking into account the normal working status of the connected preset controller.

[0026] Optionally, the motion status monitoring device further includes an anomaly detector, which is used to detect whether an anomaly has occurred in the contact structure.

[0027] In this solution, an anomaly detector can detect abnormal events in a timely manner (such as the main contact becoming normally closed due to adhesion), so as to trigger subsequent reminders and other operations in a timely manner.

[0028] Optionally, the motion status monitoring device further includes an anomaly alerter that is communicatively connected to the anomaly detector, the anomaly alerter being used to issue an alert signal indicating that an anomaly has occurred in the contact structure.

[0029] This plan enables timely notification of any abnormal situations to relevant personnel, facilitating prompt intervention and handling.

[0030] A third aspect of this disclosure provides an electrical system comprising an operating status monitoring device for a switching device as described in the second aspect, and the switching device itself.

[0031] In this solution, the electrical system includes the aforementioned status monitoring device and switching equipment (such as contactors, relays, etc.), thereby enabling timely and synchronous detection of the operating status of the contact structure, effectively improving the operational stability and safety of the entire electrical system, and ensuring the overall product performance.

[0032] Optionally, the electrical system includes a wind power system;

[0033] And / or, the switching device includes a contactor, a relay, or a circuit breaker.

[0034] In this solution, the aforementioned status monitoring device is integrated into the wind power system, which effectively improves the operational stability and reliability of the system in wind power scenarios.

[0035] Furthermore, this solution can be applied to the status output circuits of different types of switching devices to meet the detection needs of more application scenarios.

[0036] Optionally, the contact structure of the switching device includes main contacts and / or auxiliary contacts.

[0037] In this solution, either the main contact or the auxiliary contact can be used; there are no restrictions, making it more flexible and able to meet the detection needs of more application scenarios.

[0038] Optionally, if the contact structure includes auxiliary contacts, the power supply unit of the status output circuit in the operation status monitoring device includes a control power supply and / or an auxiliary power supply, wherein the control power supply supplies power to the coil in the switching device; and / or the auxiliary power supply is used to supply power to the auxiliary contacts.

[0039] In this solution, the auxiliary contacts can be powered by the control power supply and the auxiliary power supply to meet more flexible and reasonable power supply needs.

[0040] Optionally, if the contact structure includes a main contact, the power supply unit of the status output circuit in the operation status monitoring device includes a control power supply, which supplies power to the coil in the switching device.

[0041] In this solution, the main contacts only need to use a control power supply, thus meeting more flexible and reasonable power supply requirements.

[0042] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this disclosure.

[0043] The positive and progressive effects of this disclosure are as follows:

[0044] In this disclosure, from a circuit structure design perspective, the signal isolation unit is directly electrically connected to the contact structure. This allows the signal isolation unit to switch on or off in sync with the contact structure's closing or opening action. Simultaneously, the signal isolation unit's operating state switches in sync with the contact structure's operating state. When on, it isolates high-energy input signals, achieving timely synchronization of the contact structure's operating state. This prevents downstream devices such as the pre-set controller from being affected by high voltage and current, ensuring both the normal operation of the connected pre-set controller and effective synchronization of the contact structure's operating state, guaranteeing timeliness and stability of state synchronization. Furthermore, the ingenious design of multiple signal isolation subunits ensures that electrical signals can be output normally to the pre-set controller from any of the subunits. This allows for more convenient and flexible electrical connection to the input of the downstream pre-set controller, simplifying the operation process and ensuring ease and rationality in practical scenarios. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the status output circuit of the switching device according to Embodiment 1 of this disclosure;

[0046] Figure 2 This is a first structural schematic diagram of the status output circuit of the switching device according to Embodiment 1 of this disclosure;

[0047] Figure 3 This is a first structural schematic diagram of the status output circuit of the switching device according to Embodiment 2 of this disclosure;

[0048] Figure 4 This is a second structural schematic diagram of the status output circuit of the switching device according to Embodiment 2 of this disclosure;

[0049] Figure 5 This is a third structural schematic diagram of the status output circuit of the switching device according to Embodiment 2 of this disclosure;

[0050] Figure 6 This is a schematic diagram of the operating status monitoring device for switching equipment according to Embodiment 3 of this disclosure;

[0051] Figure 7 This is a schematic diagram of the electrical system of Embodiment 4 of this disclosure. Detailed Implementation

[0052] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0053] The prefixes such as "first" and "second" used in this disclosure are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this disclosure does not constitute a limitation on the described objects. The description of the described objects is given in the claims or the context of the embodiments, and should not be construed as an unnecessary limitation. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0054] Example 1

[0055] like Figure 1 As shown, the status output circuit of the switching device in this embodiment includes a signal isolation unit 1 and a power supply unit 2. The power supply unit 2, the contact structure 3 in the switching device and the signal isolation unit 1 are electrically connected in sequence. The signal isolation unit 1 includes at least two sets of signal isolation subunits 4.

[0056] like Figure 2 As shown, the output of each signal isolation subunit 4 is electrically connected to a preset controller 5 (such as a preset controller).

[0057] The switching equipment includes contactors, relays, or circuit breakers, and includes contact structures 3 and coils 6. Contact structures 3 are main contacts and / or auxiliary contacts. The signal isolation unit 1 includes isolation devices based on principles such as photoelectric feedback. Figure 2 The contact structure 3 shown in the diagram is an auxiliary contact. The circuit structure of the status output circuit for the main contact is similar, and will not be described in detail here.

[0058] Power supply unit 2 is used to supply power to the switching equipment, so that the contact structure 3 in the switching equipment is in the closed state and the corresponding contacts are connected;

[0059] The power supply unit 2 provides a power supply voltage and current that are both greater than the operating voltage and current of the preset controller. For example, the power supply unit 2 provides 220V and 10mA, while the preset controller operates at 24VDC and 5mA.

[0060] Thus, when the switching device is in the closed state, it can not only ensure that the contact end of the contact structure 3 can conduct normally when no oxide film is formed, but also effectively ensure that the contact end of the contact structure 3 can still be successfully broken down when an oxide film is formed, so that the contacts can still conduct normally, thereby avoiding the occurrence of signal transmission obstacles between contacts and effectively ensuring the realization of the synchronization of the switching device state.

[0061] Of course, the specific power supply voltage and current provided by the power supply unit 2 can be selected or adjusted according to the actual needs of the scenario, and can be flexibly configured; as long as it can ensure that the oxide film formed between the contacts of the contact structure 3 can always be effectively and timely connected, and at the same time ensure the normal operation of the back-end preset controller and other devices in the circuit, and avoid damage to the devices.

[0062] Signal isolation subunit 4 is used to disconnect when contact structure 3 is in the open state;

[0063] The signal isolation subunit 4 is used to conduct when the contact structure 3 is in the closed state, so as to synchronously output electrical signals representing the operating state of the contact structure 3 through the output terminals of different signal isolation subunits 4.

[0064] Specifically, the signal isolation subunit 4 in the signal isolation unit 1 not only follows the contact structure 3 to perform a closing action and realize its own conduction, but also isolates the high voltage and high current signals input on the input side after conduction, so as to ensure that the working status of the back-end connected equipment is not affected, thereby ensuring the operational stability of the back-end connected equipment.

[0065] In addition, when the contact structure 3 performs the disconnection action, the entire state output circuit is in a non-working state, and the preset controller 5 at the back end cannot receive the electrical signal indicating that the contact structure 3 is in a closed state. At this time, the preset controller 5 defaults to the contact structure 3 being in an open state, so as to achieve timely and reliable synchronization of the disconnection action of the contact structure 3.

[0066] In this solution, from a circuit structure design perspective, the signal isolation unit is directly electrically connected to the contact structure. This allows the signal isolation unit to switch on or off in sync with the contact structure's closing or opening action. Simultaneously, the signal isolation unit's operating state switches in sync with the contact structure's action state. When on, it isolates high-energy input signals, achieving timely synchronization of the contact structure's action state. This prevents downstream devices such as the pre-set controller from being affected by high voltage and current, ensuring both the normal operation of the connected pre-set controller and effective synchronization of the contact structure's action state, guaranteeing timeliness and stability of state synchronization. Furthermore, the ingenious design of multiple signal isolation subunits ensures that electrical signals can be output normally to the pre-set controller from any of these subunits. This allows for more convenient and flexible electrical connection to the input of the downstream pre-set controller, simplifying the operation process and ensuring ease and rationality in practical scenarios.

[0067] In addition, through the ingenious design of multiple signal isolation sub-units, electrical signals can be output normally to the preset controller regardless of which signal isolation sub-unit outputs. This enables more convenient and flexible electrical connection to the input of the preset controller at the back end, simplifies the operation process, and ensures the convenience and rationality of operation in actual scenarios.

[0068] Example 2

[0069] The status output circuit of the switching device in this embodiment is a further improvement on Embodiment 1, specifically:

[0070] In a feasible solution, such as Figure 3 As shown, each signal isolation subunit 4 includes a coupling switch 7 and a first diode 8. The input terminal of the coupling switch 7 in each group is electrically connected to the contact structure 3, and the output terminal of the coupling switch 7 in each group is electrically connected to different first diodes 8. The output terminals of different first diodes 8 are electrically connected to different input terminals of the preset controller 5. The coupling switch 7 is used to isolate the signal on the input side when it is in the on state.

[0071] In this scheme, each group of signal isolation subunits 4 includes a coupling switch 7 and a first diode 8 to achieve synchronization of the action state of each group of signal isolation subunits 4 with the contact, ensuring timely and reliable synchronization of switch action states.

[0072] In a feasible solution, such as Figure 3 As shown, the signal isolation unit 1 includes two sets of signal isolation subunits 4, the coupling switch 7 includes an optocoupler, the optocoupler includes a light-emitting diode 9 and a phototransistor 10, each light-emitting diode 9 is electrically connected to the contact structure 3, the output terminal of each phototransistor 10 is electrically connected to the input terminals of two first diodes 8 respectively, and the collector of each phototransistor 10 is electrically connected to the output terminal of the corresponding first diode 8 and an input terminal of the preset controller 5.

[0073] Specifically, Figure 3 The corresponding auxiliary contact is in a closed state; Figure 4 The corresponding auxiliary contact is in the off state.

[0074] In this solution, the circuit setup of two sets of coupling switches and two diodes enables the switching on and off control of the coupling switches, thereby achieving effective synchronization of the operating state of the switching equipment and isolating the input signal to ensure the working stability of the back-end preset controller. At the same time, it allows electrical signals to be output normally to the preset controller from either output terminal, enabling more convenient and flexible electrical connection with the input terminal of the back-end equipment, simplifying the operation process and ensuring the convenience and rationality of operation in actual scenarios.

[0075] In one feasible embodiment, the signal isolation unit 1 further includes a current-limiting resistor R, which is electrically connected between the contact structure 3 and the input terminal of the light-emitting diode 9.

[0076] The size and number of current-limiting resistors can be reasonably set or adjusted according to the design requirements of the actual scenario.

[0077] In this scheme, a current-limiting resistor is set in the main circuit of the status output circuit to protect the corresponding components in the circuit from damage due to overcurrent, so as to ensure the overall stability and reliability of the status output circuit.

[0078] In one feasible embodiment, the contact structure 3 includes main contacts and / or auxiliary contacts;

[0079] Contact structure 3 includes auxiliary contacts, and the power supply unit includes control power supply 11 and / or auxiliary power supply 12, which are used to supply power to the auxiliary contacts; such as Figure 5 As shown, contact structure 3 is an auxiliary contact, and the power supply unit includes a control power supply 11 and an auxiliary power supply 12.

[0080] The contact structure 3 includes main contacts, and the power supply unit 2 includes a control power supply, which supplies power to the coil 6 in the switching device.

[0081] The control power supply can be a fixed voltage or an adjustable operating voltage power supply device, thus achieving more flexible power supply requirements.

[0082] In this solution, the auxiliary contacts can be powered by the control power supply and the auxiliary power supply, while the main contacts only need to be powered by the control power supply, thus meeting more flexible and reasonable power supply requirements.

[0083] In one feasible embodiment, the status output circuit further includes a second diode electrically connected between the auxiliary power supply and contact structure 3; wherein, as... Figures 3-5 D1 in the diagram is the second diode.

[0084] In this design, the second diode effectively prevents backflow of current or interference between circuits, thereby further ensuring the stability and reliability of the overall circuit.

[0085] In one feasible embodiment, the status output circuit further includes a third diode, which is electrically connected between the control power supply and contact structure 3; wherein, for example... Figures 3-5 D2 in the diagram is the third diode.

[0086] In this design, the third diode effectively prevents backflow of current or interference between circuits, thereby further ensuring the stability and reliability of the overall circuit.

[0087] In a feasible solution, such as Figures 3-5 As shown, the status output circuit also includes a main switch S, which is electrically connected between the control power supply and the coil 6.

[0088] The main switch is a single-pole switch. When it is closed, the power supply unit 2 supplies power to the back-end circuit. Conversely, when it is open, it is equivalent to cutting off the overall power supply. The power supply unit 2 no longer supplies power to the back-end circuit, and the entire state output circuit is in the open state.

[0089] In this solution, a main switch is set in the main circuit of the status output circuit to achieve more flexible control of the power supply of the entire circuit, so as to meet the power supply requirements of the actual scenario.

[0090] Example 3

[0091] like Figure 6 As shown, the operating status monitoring device of the switching equipment in this embodiment includes the status output circuit 100 of the switching equipment in embodiment 1 or 2, and a preset controller 5 electrically connected to the status output circuit 100. The operating status monitoring device is used to synchronously output an electrical signal indicating that the contact structure 3 is in a closed state to the preset controller 5.

[0092] Among them, the preset controller 5 includes, but is not limited to, PLC (Programmable Controllers).

[0093] When the preset controller 5 does not receive an electrical signal indicating that the contact structure 3 is in a closed state, it will automatically assume that the contact structure 3 in the switching device is in an open state. This will enable timely and synchronous detection of the action state of the contact structure 3 as open, thereby achieving timely and reliable synchronization of the opening action of the contact structure 3 and effectively monitoring the status of the switching device.

[0094] In addition, the status monitoring device of the switching equipment in this embodiment may also include an abnormality detector, which is used to detect whether an abnormality occurs in the contact structure 3, such as when the main contact is normally closed due to adhesion, and the main contact remains closed even if the power supply unit stops supplying power to the coil 6, so as to trigger an abnormality reminder signal so as to trigger subsequent reminders and other operations in a timely manner.

[0095] For example, the anomaly detector can be a device that includes an image acquisition unit and an image processor. That is, the image acquisition unit acquires a state image of the contact structure 3 and sends it to the image processor for processing to obtain a processing result of whether the contact structure 3 has an anomaly. It should be noted that the processing of detecting whether the contact structure 3 has an anomaly is a function of the selected existing device itself, and the processing principle involved is not within the scope of protection of this embodiment. Of course, the anomaly detector can also be implemented using other devices, as long as it can be implemented, which will not be elaborated here.

[0096] The status monitoring device for the switching equipment in this embodiment may further include an anomaly alerter communicatively connected to the anomaly detector. The anomaly alerter is used to issue an alert signal indicating an anomaly in the contact structure, promptly informing relevant personnel of the abnormality so that timely intervention can be carried out. This anomaly alerter includes, but is not limited to, a display, a voice announcer, a video player, and an indicator light; wherein, the display is used to display the text indicating an anomaly in the contact structure 3; the voice announcer is used to directly announce the anomaly in the contact structure 3 via voice (voice text or alarm tone); the video player is used to play the corresponding video of the anomaly in the contact structure 3, and may also simultaneously announce the anomaly in the contact structure 3 via voice; the indicator light uses a specific display color and a specific display frequency light signal to indicate an anomaly in the contact structure 3.

[0097] In this solution, the status monitoring device includes the aforementioned status output circuit and a preset controller, so as to effectively detect the action status of the contact structure while taking into account the normal working status of the connected preset controller, so that the preset controller can detect the status of the switching equipment in a timely and reliable manner.

[0098] In addition, a resistor RL is provided between the output terminal of any one or more signal isolation subunits and the input terminal of the preset controller, such as... Figures 2-5 As shown, the resistor RL is used to limit the current, so as to further prevent the overcurrent in the entire circuit from damaging the devices passing through it, and further ensure the operational stability and reliability of the operating status monitoring device.

[0099] Example 4

[0100] like Figure 7 As shown, the electrical system of this embodiment includes the operating status monitoring device 300 of the switching device in embodiment 3, and the switching device 400.

[0101] In this solution, the electrical system includes the aforementioned status monitoring device and switching equipment 400 (such as contactors, relays, etc.), thereby enabling timely and synchronous detection of the operating status of the contact structure 3, effectively improving the operational stability and safety of the entire electrical system, and ensuring the overall product performance.

[0102] Example 5

[0103] The electrical system in this embodiment is a further improvement on embodiment 4, specifically:

[0104] In one feasible solution, the electrical system includes a wind power system.

[0105] In this solution, the aforementioned condition monitoring device is integrated into the wind power system, which effectively improves the operational stability and reliability of the system in wind power scenarios and further enhances the overall product performance of existing wind power systems.

[0106] Specifically, the wind power system includes a wind turbine, a yaw motor for controlling the rotation direction of the wind turbine, and a contactor for controlling the start and stop of the yaw motor. The contactor is provided with auxiliary contacts. When the auxiliary contacts develop an oxide film due to moisture, the power supply unit of this embodiment can provide a sufficiently large voltage and current to break down the oxide film, thereby avoiding contact signal transmission failure.

[0107] In one feasible embodiment, the switchgear 400 includes a contactor, relay, or circuit breaker.

[0108] In this solution, for the contact structure of the switching equipment, the operating states of the main contacts and auxiliary contacts are generally synchronized. The state synchronization circuit of the switching equipment can synchronize only with the operation of the main contacts, only with the operation of the auxiliary contacts, or simultaneously with the operation of both the main contacts and auxiliary contacts. That is, the trigger unit can move only following the operation of the main contacts, only following the operation of the auxiliary contacts, or simultaneously following the operation of both the main contacts and auxiliary contacts, thus achieving a more flexible circuit design and a reliable realization of the state synchronization of the switching equipment to meet the detection needs of more application scenarios.

[0109] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A status output circuit for a switching device, characterized in that, The status output circuit includes a signal isolation unit and a power supply unit. The power supply unit, the contact structure in the switching device, and the signal isolation unit are electrically connected in sequence. The signal isolation unit includes at least two sets of signal isolation subunits. The power supply unit is used to supply power to the switching device, so that the corresponding contacts of the contact structure are connected when the contact structure is in the closed state. The signal isolation subunit is used to disconnect when the contact structure is in an open state; The signal isolation subunit is used to conduct when the contact structure is in a closed state, so as to synchronously output an electrical signal characterizing the operating state of the contact structure through the output terminals of different signal isolation subunits.

2. The status output circuit of the switching device as described in claim 1, characterized in that, Each group of signal isolation subunits includes a coupling switch and a first diode. The input terminal of the coupling switch in each group is electrically connected to the contact structure, and the output terminal of the coupling switch in each group is electrically connected to different first diodes. The output terminals of different first diodes are electrically connected to different input terminals of a preset controller. The coupling switch is used to isolate the signal on the input side when it is in the on state.

3. The status output circuit of the switching device as described in claim 2, characterized in that, The signal isolation unit includes two sets of signal isolation sub-units. The coupling switch includes an optocoupler, which includes a light-emitting diode and a phototransistor. Each light-emitting diode is electrically connected to the contact structure. The output terminal of each phototransistor is electrically connected to the input terminals of the two first diodes. The collector of each phototransistor is electrically connected to the output terminal of the corresponding first diode and an input terminal of the preset controller.

4. The status output circuit of the switching device as described in claim 3, characterized in that, The signal isolation unit also includes a current-limiting resistor, which is electrically connected between the contact structure and the input terminal of the light-emitting diode.

5. The status output circuit of the switching device as described in any one of claims 1-4, characterized in that, The status output circuit also includes a second diode, which is electrically connected between the power supply unit and the contact structure. And / or, The status output circuit also includes a third diode, which is electrically connected between the power supply unit and the contact structure. And / or, The status output circuit also includes a main switch, which is electrically connected between the power supply unit and the coil in the switching device.

6. A device for monitoring the operational status of a switchgear, characterized in that, The operation status monitoring device includes a status output circuit of the switching device as described in any one of claims 1-5, and a preset controller electrically connected to the status output circuit.

7. The switching equipment operation status monitoring device as described in claim 6, characterized in that, The operation status monitoring device also includes an anomaly detector, which is used to detect whether an anomaly has occurred in the contact structure.

8. The switching equipment operation status monitoring device as described in claim 7, characterized in that, The motion status monitoring device also includes an anomaly alerter that is communicatively connected to the anomaly detector. The anomaly alerter is used to issue an alert signal indicating that an anomaly has occurred in the contact structure.

9. An electrical system, characterized in that, The electrical system includes a device for monitoring the operating status of a switchgear as described in any one of claims 6-8, and the switchgear itself.

10. The electrical system as described in claim 9, characterized in that, The electrical system includes a wind power system; And / or, the switching device includes a contactor, a relay, or a circuit breaker.

11. The electrical system as described in claim 9 or 10, characterized in that, The contact structure of the switching device includes main contacts and / or auxiliary contacts.

12. The electrical system as claimed in claim 11, characterized in that, If the contact structure includes an auxiliary contact, the power supply unit of the status output circuit in the operation status monitoring device includes a control power supply and / or an auxiliary power supply, wherein the control power supply supplies power to the coil in the switching device; and / or the auxiliary power supply is used to supply power to the auxiliary contact.

13. The electrical system as claimed in claim 11, characterized in that, If the contact structure includes a main contact, the power supply unit of the status output circuit in the operation status monitoring device includes a control power supply, which supplies power to the coil in the switching device.

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