Switch device control system and switch device

Abstract

The invention discloses a switch equipment control system and switch equipment, the switch equipment comprises a three-position switch and a circuit breaker, the three-position switch and the circuit breaker are connected in series, and the control system comprises a control panel and a control module; the control panel is in communication connection with the control module, and the control panel is used for sending a control instruction to the control module; the control module is used for receiving a control instruction to drive the three-position switch and the circuit breaker to act. According to the invention, the manual operation steps can be simplified, the equipment fault risk caused by man-made misjudgment or operation time sequence errors is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control, and particularly to a control system and a switching device for a switching device. Background Art

[0002] In the power system, as a key control and protection device, the reliability and operation efficiency of the switching device directly affect the stability of the power grid operation. The switching device usually adopts a structure in which a three-position switch and a circuit breaker cooperate with each other to realize the functions of circuit connection, isolation and grounding.

[0003] However, in traditional switching devices, the three-position switch and the circuit breaker usually adopt independent manual operation methods. The operator needs to directly control the switching of the three positions of "connection", "isolation" and "grounding" of the three-position switch through a mechanical handle or a physical button, and separately operate the opening and closing actions of the circuit breaker. This manual operation mode has significant defects: First, multi-step operations rely on manual experience and on-site judgment, and it is easy to cause equipment damage or safety accidents due to misoperation (such as switching positions with load); Second, the operation process requires personnel to frequently travel to the equipment site, resulting in low efficiency. Summary of the Invention

[0004] The present invention provides a control system and a switching device for a switching device, which can simplify the manual operation steps, reduce the risk of equipment failure caused by human misjudgment or incorrect operation timing, and improve the operation efficiency.

[0005] In a first aspect, an embodiment of the present invention provides a control system for a switching device. The switching device includes a three-position switch and a circuit breaker, and the three-position switch and the circuit breaker are connected in series. The control system includes: a control panel and a control module; the control panel is communicatively connected to the control module, and the control panel is used to send control instructions to the control module; the control module is connected to the three-position switch and the circuit breaker, and the control module is used to receive the control instructions to drive the three-position switch and the circuit breaker to act.

[0006] Optionally, the display interface of the control panel includes: an intelligent dynamic simulation indication area, which is used to display the operation state of the switching device, the communication state between the control panel and the control module, and alarm information in real time through color changes; an intelligent programmed control area, which is used to receive touch signals and send control instructions to the control module to realize the opening and closing operations of the three-position switch and the circuit breaker; an intelligent on-line monitoring display area, which is used to display the pressure, temperature, density and moisture content of the insulating gas in the switching device in real time, and is also used to display the partial discharge intensity of each phase of A, B, and C and the temperature of the cable heads of each phase of A, B, and C in the switching device.

[0007] Optionally, the intelligent dynamic simulation indication area includes: an operation indication module, a communication indication module, and an alarm indication module; the operation indication module is used to change the color once every preset time to display the operation state of the switching device, and stop flashing if the switching device freezes; the communication indication module is used to interact with the control module every preset time, and keep flashing during normal communication; the alarm indication module is used to change the flashing content of the alarm information and the flashing color of the alarm indication every preset time when the control instruction sent by the control panel is inconsistent with the switching state received by the control module.

[0008] Optionally, the control system of the switching device further includes a plurality of optocoupler relays. The control module is connected to the three-position switch and the circuit breaker through the corresponding optocoupler relays. The control module collects the state of the optocoupler relays once every preset time and maps it to the color display on the control panel.

[0009] Optionally, the control module includes: a control unit and an isolation unit; the control unit is connected to the isolation unit. The control unit is used to collect the position states of the three-position switch and the circuit breaker and send the position states to the control panel; it is also used to receive control instructions to drive the three-position switch and the circuit breaker to act; the isolation unit is connected to the control panel and is used to achieve electrical isolation between the control panel and the control unit.

[0010] Optionally, the control system of the switching device further includes a gas monitoring module. The gas monitoring module is connected to the control module and is used to monitor the pressure, temperature, density, and moisture content of the insulating gas in the switching device.

[0011] Optionally, the control system of the switching device further includes a partial discharge monitoring module. The partial discharge monitoring module is connected to the control module and is used to monitor the partial discharge intensity of each phase A, B, and C and the temperature of the cable heads of each phase A, B, and C in the switching device.

[0012] Optionally, the control system of the switching device further includes a plurality of position sensors. The position sensors are connected to the control module and are used to collect the position states of the three-position switch and the circuit breaker and send the position states to the control module.

[0013] Optionally, the control panel is a 7-inch human-machine interface serial touch display control screen.

[0014] In a second aspect, an embodiment of the present invention provides a switching device, including the control system of the switching device provided in any embodiment of the present invention.

[0015] The control system of the switching device provided by the embodiment of the present invention includes a control panel and a control module. Through the communication connection between the control panel and the control module, the unified parsing and automatic execution of control instructions are realized, simplifying the manual operation steps, reducing the risk of equipment failure caused by human misjudgment or operation timing errors, and improving the operation efficiency. At the same time, by driving the coordinated action of the three-position switch and the circuit breaker, it is ensured that the action timings of the two are accurately matched, avoiding potential safety hazards such as live switching or locking failure, enhancing the reliability and response speed of power system operations, and meeting the requirements of the smart grid for equipment automation, high integration, and safety.

[0016] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a control system of a switching device provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention;

[0022] Figure 5 is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention;

[0023] Figure 6 is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0026] Figure 1 is a schematic structural diagram of a control system for a switching device provided by an embodiment of the present invention. As Figure 1 shown, the switching device includes a three-position switch 11 and a circuit breaker 12. The three-position switch 11 and the circuit breaker 12 are connected in series. The control system 10 includes: a control panel 20 and a control module 30. The control panel 20 is communicatively connected to the control module 30. The control panel 20 is used to send control instructions to the control module 30. The control module 30 is connected to the three-position switch 11 and the circuit breaker 12. The control module 30 is used to receive the control instructions to drive the three-position switch 11 and the circuit breaker 12 to act.

[0027] Specifically, the three-position switch 11 is also called a three-position disconnecting switch. The so-called three positions refer to three working positions, which are respectively the closing position where the main break of the disconnecting switch is closed, the isolating position where the main break is separated, and the grounding position on the grounding side; that is, the three-position switch includes a disconnecting switch and an earthing switch. The disconnecting switch and the earthing switch are limit switches, which are devices for detecting the position of an object based on mechanical contact; when the detected object contacts or leaves the contact of the switch, the contact state of the switch will change, thereby providing an electrical signal.

[0028] The circuit breaker 12 is a protection device. When overload or short circuit occurs in the circuit, it will automatically disconnect the circuit to play a protective role.

[0029] The control panel 20 can be a 7-inch human-machine interface (HMI) serial touch display control panel. It interacts with the control module 30 through wire (such as RS485) or wireless (such as Wi-Fi).

[0030] The control module 30 may include a micro control unit. Optionally, the control module 30 may include a single-chip microcomputer, and may also include a Digital Signal Processor (DSP) or a Field Programmable Gate Array (FPGA).

[0031] Continue to refer to Figure 1 , and the working principle of the control system of the switching device is as follows:

[0032] The user selects an operation (such as the power-on operation of the switching device) through the control panel 20, and the control instruction is sent to the control module 30 via a communication link (such as a serial port protocol). The control module 30 first checks whether the operation is logical (for example: it is necessary to confirm that the circuit breaker is not in a fault state before closing), and converts the control instruction into a specific drive signal (such as an electrical signal or a pneumatic signal). The three-position switch 11 switches to the target position according to the drive signal (such as switching from the closing position to the opening position). The circuit breaker 12 closes or opens according to the drive signal. In addition, the three-position switch 11 and the circuit breaker 12 can feedback the current position status to the control module 30 through position sensors. The control module 30 transmits the status information back to the control panel 20 for the user to confirm the operation result. The control panel 20 provides an intuitive interface, supports local and remote operations, and improves the operation and maintenance efficiency.

[0033] The control system of the switching device provided by the embodiment of the present invention includes a control panel and a control module. Through the communication connection between the control panel and the control module, the unified parsing and automatic execution of control instructions are realized, the manual operation steps are simplified, the risk of equipment failure caused by human misjudgment or operation timing error is reduced, and the operation efficiency is improved; at the same time, by driving the coordinated actions of the three-position switch and the circuit breaker, it is ensured that the action timings of the two are precisely matched, avoiding safety hazards such as live switching or locking failure, improving the reliability and response speed of the power system operation, and meeting the requirements of the smart grid for equipment automation, high integration and safety.

[0034] Figure 2 is a schematic structural diagram of another control system of the switching device provided by the embodiment of the present invention. As Figure 2 shown, optionally, the display interface of the control panel 20 includes:

[0035] The intelligent dynamic simulation indication area 201 is used to display the operation status of the switching device, the communication status between the control panel 20 and the control module 30, and the alarm information in real time through color changes.

[0036] The intelligent programmed control area 202 is used to receive touch signals and send control instructions to the control module 30 to realize the opening and closing operations of the three-position switch 11 and the circuit breaker 12.

[0037] The intelligent online monitoring display area 203 is used to display the pressure, temperature, density, and moisture content of the insulating gas in the switchgear in real time, and is also used to display the partial discharge intensity of each phase of A, B, and C and the temperature of the cable heads of each phase of A, B, and C in the switchgear.

[0038] Specifically, the intelligent dynamic simulation indication area 201 displays the operating states of the three-position switch 11 and the circuit breaker 12 in real time through color changes. For example, when the three-position switch 11 is closed, it shows green; when it is open, it shows red; when it is grounded, it shows yellow. The communication between the control panel 20 and the control module 30 is displayed through a color bar (e.g., green indicates connection, and gray indicates disconnection). Equipment faults, overloads, or abnormal states are prompted by flashing or highlighting colors (such as red). Optionally, a dynamic graphical interface (such as configuration software) can be used to interact with the control module 30 in real time to obtain status data.

[0039] The user sends control commands through virtual buttons on the intelligent programmed control area 202, such as "closing", "opening", "grounding", "power-on operation", and "power-off operation". A power-off operation refers to artificially cutting off the power supply of a certain area or equipment for equipment maintenance, repair, safety control, or other specific purposes; a power-on operation is the reverse process of a power-off operation, that is, restoring the power supply of a certain area or equipment. The power-on operation process can be as follows: when the control module 30 receives a power-on operation instruction, it determines whether the grounding switch is in the closed position according to the first feedback signal of the grounding switch position sensor. When it is determined that the grounding switch is in the closed position, the control module 30 issues a first control signal for opening the grounding switch and detects the second feedback signal of the grounding switch position sensor within a preset time; if the second feedback signal is consistent with the first control signal, the control module 30 issues a second control signal for closing the disconnector; the third feedback signal of the disconnector position sensor is detected within a preset time; if the third feedback signal is consistent with the second control signal, the control module 30 issues a third control signal for closing the circuit breaker. In this embodiment, before performing the closing action, a double-criterion method is used to judge the working position. Specifically, the working position is judged according to the feedback signal of the position sensor and the control signal issued by the control module 30, and it is determined whether the electric operating mechanism has completed the established action before performing the next action, which greatly reduces the possibility of misoperation and ensures the stability of the power transmission process of the distribution network.

[0040] The intelligent online monitoring display area 203 monitors the pressure, temperature, density, and moisture content of the insulating gas (such as SF6 gas) in the switchgear. The pressure, temperature, and density of the insulating gas reflect the gas tightness and insulation performance, and abnormalities may cause the equipment to break down. Excessive moisture in the insulating gas will reduce the insulation strength and requires timely drying treatment.

[0041] Figure 3It is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention. As Figure 3 shown, optionally, the intelligent dynamic simulation indication area 201 includes: an operation indication module 2010, a communication indication module 2011, and an alarm indication module 2012; the operation indication module 2010 is used to change the color once every preset time to display the operation state of the switching device, and stop flashing if the switching device freezes. The communication indication module 2011 is used to interact data with the control module 30 every preset time, and continuously flashes during normal communication. The alarm indication module 2012 is used to change the flashing content of the alarm information and the flashing color of the alarm indication every preset time when the control instruction sent by the control panel 20 is inconsistent with the switch state received by the control module 30.

[0042] Specifically, the operation indication module 2010 alternately displays green (isolating switch closed), red (isolating switch open), and yellow (earthing switch earthed) at a preset period (such as 0.5 seconds / time). If the switching device stops responding due to a fault or communication interruption, the module stops flashing and maintains the last state (such as gray).

[0043] The communication indication module 2011 verifies the communication status between the control panel 20 and the control module 30 through periodic data interaction. Exemplarily, continuously flashing blue or green (such as 0.5 seconds / time) indicates normal data interaction. Stopping flashing and displaying gray, or switching to red constant on indicates a fault with the control panel and the control module 30. Optionally, the control panel 20 sends a heartbeat packet instruction to the control module 30 every preset time (such as 0.5 seconds) and receives a response confirmation. If the response is not received continuously for multiple times, a communication interruption alarm is triggered.

[0044] When the control instruction sent by the control panel 20 is inconsistent with the switch state feedback by the control module 30, an alarm is triggered. Words or symbols (such as "instruction timeout", "position mismatch") are alternately displayed. Color switching: yellow → red → blue cycle. For example, after sending a closing instruction, if the control module 30 does not detect the closed state within the specified time, the text of position mismatch is displayed.

[0045] Figure 4 It is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention. As Figure 4 shown, optionally, the control system of the switching device further includes a plurality of opto-coupler relays 40. The control module 30 is connected to the three-position switch 11 and the circuit breaker 12 through the corresponding opto-coupler relays 40. The control module 30 collects the state of the opto-coupler relays 40 once every preset time and maps it to the color display on the control panel 20.

[0046] Specifically, the opto-relay 40 achieves electrical isolation between the control module 30, the three-position switch 11, and the circuit breaker 12 through opto-coupling technology, preventing the strong electrical signals of high-voltage equipment (such as above 10 kV) from directly entering the control module and avoiding interference or damage to low-voltage electronic circuits. The opto-relay 40 converts the weak electrical instructions (such as 5V level signals) of the control module 30 into strong electrical signals (such as 24V or higher) for driving the switching equipment, and at the same time feeds back the status signals (such as opening position or closing position) of the switching equipment to the control module 30. Each three-position switch 11 and circuit breaker 12 corresponds to at least one opto-relay 40 to achieve independent control.

[0047] The control panel 20 sends opening or closing instructions to the control module 30. The control module 30 outputs a driving signal through the opto-relay 40 to drive the switching equipment to act. The opto-relay 40 real-time detects the opening or closing position of the switching equipment and feeds back the status signal (such as contact closed or open) to the control module 30. The control module 30 converts the status of the opto-relay 40 into a color code (such as green for closing and red for opening) and updates it to the intelligent dynamic simulation indication area 201 of the control panel 20.

[0048] Figure 5 It is a schematic structural diagram of another control system of the switching equipment provided by the embodiment of the present invention. As Figure 5 shown, optionally, the control module 30 includes: a control unit 301 and an isolation unit 302.

[0049] The control unit 301 is connected to the isolation unit 302. The control unit 301 is used to collect the position status of the three-position switch 11 and the circuit breaker 12 and send the position status to the control panel 20. It is also used to receive control instructions to drive the three-position switch 11 and the circuit breaker 12 to act. The isolation unit 302 is connected to the control panel 20 and is used to achieve electrical isolation between the control panel 20 and the control unit 301.

[0050] Specifically, the control unit 301 real-time monitors the opening and closing position status (such as closing in place and opening in place) of the three-position switch 11 and the circuit breaker 12 through sensors or auxiliary contacts, and converts the position signals into electrical signals (such as 0V or 5V level). Receives the opening and closing control instructions sent by the control panel 20, and drives the three-position switch 11 and the circuit breaker 12 to act after internal logic processing. Uploads the collected switch position status to the control panel 20 through the isolation unit 302, and at the same time receives the control instructions of the control panel 20 and executes them.

[0051] The isolation unit 302 cuts off the direct electrical connection between the control panel 20 (low-voltage side, such as 5V) and the control unit 301 (high-voltage side, such as 24V) through technologies such as optocouplers, magnetic couplers, or transformers, preventing high voltage from penetrating into the low-voltage circuit and causing damage or safety hazards.

[0052] Figure 6 It is a schematic structural diagram of another control system of a switching device provided by an embodiment of the present invention. As Figure 6 shown, optionally, the control system of the switching device further includes a gas monitoring module 50. The gas monitoring module 50 is connected to the control module 30 and is used to monitor the pressure, temperature, density, and moisture content of the insulating gas in the switching device.

[0053] Specifically, the gas monitoring module 50 continuously monitors the pressure, temperature, density, and moisture content of the insulating gas (such as SF6) in the switching device. The monitored data is sent to the control module 30 for the status display of the control panel 20 and the historical data analysis. Optionally, the gas parameters are collected by pressure sensors, temperature and humidity sensors, and density meters and transmitted to the control module 30 after analog-to-digital conversion. The control module 30 determines whether to trigger an alarm (such as the alarm indicator module 2012 flashing red) according to a preset threshold. When the gas density is lower than the safety value, the control module 30 can automatically lock the opening and closing operations of the circuit breaker 12 to prevent accidents caused by insulation failure.

[0054] Optionally, continuing to refer to Figure 6 , the control system of the switching device further includes a partial discharge monitoring module 60. The partial discharge monitoring module 60 is connected to the control module 30 and is used to monitor the partial discharge intensity of each phase A, B, and C in the switching device and the temperature of the cable heads of each phase A, B, and C.

[0055] Specifically, the partial discharge intensity of each phase A, B, and C can be monitored by high-frequency current sensors or ultra-high-frequency sensors. The cable head temperature is synchronously collected to identify overheating caused by poor contact or aging. Combining the discharge intensity and temperature data, the insulation aging trend is predicted to avoid sudden failures.

[0056] Optionally, continuing to refer to Figure 6 , the control system of the switching device further includes a plurality of position sensors 70. The position sensors 70 are connected to the control module 30 and are used to collect the position states of the three-position switch 11 and the circuit breaker 12 and send the position states to the control module 30.

[0057] Specifically, the position sensors 70 are installed on the switch mechanical structure. When the switch operates in place, the sensor outputs a level signal (such as 5V). The control module 30 polls the status of the position sensors 70 at preset intervals (such as 100 ms) to ensure real-time performance. The position sensors 70 ensure that the operation instructions are consistent with the actual switch state, reducing the risk of misoperation.

[0058] Based on the same inventive concept, an embodiment of the present invention further provides a switching device, including the control system of the switching device provided in any embodiment of the present invention, having the corresponding functional modules and beneficial effects of the control system of the switching device, which will not be elaborated herein in this embodiment.

[0059] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control system for a switching device, characterized in that, The switchgear includes a three-position switch and a circuit breaker, and the three-position switch and the circuit breaker are connected in series. The control system includes: a control panel and a control module; The control panel is communicatively connected to the control module, and the control panel is used to send control instructions to the control module; The control module is connected to the three-position switch and the circuit breaker, and the control module is used to receive the control instructions to drive the three-position switch and the circuit breaker to operate.

2. The control system of the switchgear according to claim 1, characterized in that, The display interface of the control panel includes: An intelligent dynamic simulation indication area, which is used to display the operating state of the switchgear, the communication state between the control panel and the control module, and alarm information in real time through color changes; An intelligent programmed control area, which is used to receive touch signals and send the control instructions to the control module to realize the opening and closing operations of the three-position switch and the circuit breaker; An intelligent on-line monitoring display area, which is used to display the pressure, temperature, density and moisture content of the insulating gas in the switchgear in real time, and is also used to display the partial discharge intensity of each phase of A, B, and C and the temperature of the cable heads of each phase of A, B, and C in the switchgear.

3. The control system of the switching device according to claim 2, characterized in that, The intelligent dynamic simulation indication area includes: an operation indication module, a communication indication module and an alarm indication module; The operation indication module is used to change the color at preset intervals to display the operating state of the switchgear, and stop flashing if the switchgear freezes; The communication indication module is used to interact data with the control module at the preset interval, and keep flashing during normal communication; The alarm indication module is used to change the flashing content of the alarm information and the flashing color of the alarm indication at the preset interval when the control instruction sent by the control panel is inconsistent with the switch state received by the control module.

4. The control system of the switching device according to claim 3, characterized in that, It also includes a plurality of opto-coupler relays. The control module is connected to the three-position switch and the circuit breaker through the corresponding opto-coupler relays. The control module collects the state of the opto-coupler relays at the preset interval and maps it to the color display on the control panel.

5. The control system of the switchgear according to claim 1, characterized in that, The control module includes: a control unit and an isolation unit; The control unit is connected to the isolation unit. The control unit is used to collect the position states of the three-position switch and the circuit breaker and send the position states to the control panel; it is also used to receive the control instructions to drive the three-position switch and the circuit breaker to operate; The isolation unit is connected to the control panel and is used to realize the electrical isolation between the control panel and the control unit.

6. The control system of the switchgear according to claim 1, wherein It also includes a gas monitoring module, which is connected to the control module and is used to monitor the pressure, temperature, density and moisture content of the insulating gas in the switchgear.

7. The control system of the switching device according to claim 1, characterized in that, It also includes a partial discharge monitoring module, which is connected to the control module and is used to monitor the partial discharge intensity of each phase of A, B, and C and the temperature of the cable heads of each phase of A, B, and C in the switchgear.

8. The control system of the switchgear according to claim 1, characterized in that, It further includes a plurality of position sensors, which are connected to the control module and used to collect the position states of the three-position switch and the circuit breaker, and send the position states to the control module.

9. The control system of the switchgear according to claim 1, characterized in that, The control panel is a 7-inch human-machine interface serial touch display control screen.

10. A switching device, characterized in that, It includes a control system of the switchgear according to any one of claims 1-9.

Images