WO2020052663A1 - 机械式高压直流断路器控制与保护系统及其控制方法 - Google Patents

机械式高压直流断路器控制与保护系统及其控制方法 Download PDF

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Publication number
WO2020052663A1
WO2020052663A1 PCT/CN2019/105746 CN2019105746W WO2020052663A1 WO 2020052663 A1 WO2020052663 A1 WO 2020052663A1 CN 2019105746 W CN2019105746 W CN 2019105746W WO 2020052663 A1 WO2020052663 A1 WO 2020052663A1
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WIPO (PCT)
Prior art keywords
circuit breaker
current
module
voltage
control
Prior art date
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Ceased
Application number
PCT/CN2019/105746
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English (en)
French (fr)
Inventor
王坤
谈翀
于建斌
薛继印
颜世凯
张玉舒
白长玉
张曼玉
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Shandong Electrical Engineering and Equipment Group Co Ltd
Shandong Power Equipment Co Ltd
Original Assignee
Shandong Electrical Engineering and Equipment Group Co Ltd
Shandong Power Equipment Co Ltd
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Application filed by Shandong Electrical Engineering and Equipment Group Co Ltd, Shandong Power Equipment Co Ltd filed Critical Shandong Electrical Engineering and Equipment Group Co Ltd
Priority to EP19860069.4A priority Critical patent/EP3739706A4/en
Publication of WO2020052663A1 publication Critical patent/WO2020052663A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H01H2009/543—Contacts shunted by static switch means third parallel branch comprising an energy absorber, e.g. MOV, PTC, Zener
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle for interrupting DC

Definitions

  • the present application relates to the technical field of DC power distribution, and in particular to a mechanical high-voltage DC circuit breaker control and protection system and a control method thereof.
  • DC circuit breakers can be divided into three types: solid state DC circuit breakers, mechanical DC circuit breakers, and hybrid DC circuit breakers.
  • mechanical DC circuit breakers have a good research and application background due to their advantages such as low cost, small loss, and strong breaking capacity.
  • the control and protection system of the mechanical high-voltage DC circuit breaker involves the rapid identification of short-circuit current, the fast action of the electromagnetic repulsion mechanism, the system status feedback indication, and the interactive transmission of information. Sex and stability put forward higher requirements.
  • control and protection system of mechanical high-voltage DC circuit breakers there are incomplete overall functions, low performance reliability, and cannot be directly applied to products, which cannot meet the needs of hanging network use.
  • the embodiments of the present application are expected to provide a mechanical high-voltage DC circuit breaker control and protection system and a control method thereof.
  • An embodiment of the present application provides a mechanical high-voltage DC circuit breaker control and protection system.
  • the system includes a central processing unit module, a current acquisition judgment module, a voltage information acquisition module, and an action control module connected to the central processor module.
  • the current acquisition and judgment module is configured to collect current parameters in the topology of the mechanical high-voltage DC circuit breaker, determine whether a short circuit occurs according to the current parameters, and feed back the determination result and the current parameters to the central processor module;
  • the voltage information acquisition module is configured to collect voltage parameters of a converter capacitor in the mechanical high-voltage DC circuit breaker topology, and send the voltage parameters to the central processing unit module;
  • the central processor module is configured to send a control instruction to the action control module according to a determination result sent by the current collection determination module and / or a voltage parameter sent by the voltage information collection module;
  • the action control module is configured to perform at least one of the following actions according to a control instruction sent by the central processor module: opening and closing of a permanent magnet mechanism of a main circuit breaker, opening of an electromagnetic repulsion mechanism of a main circuit breaker, and auxiliary circuit breaking The on / off of the converter and the on / off of the converter switch.
  • the current acquisition judgment module includes a current information acquisition unit and a current detection processing unit; wherein,
  • the current collection judgment module is configured to collect current parameters in a mechanical high-voltage DC circuit breaker topology, and the current parameters include a current change rate and / or a current amplitude;
  • the current detection processing unit is configured to determine whether a short circuit occurs according to the current parameter, and feed back a determination result to the central processing unit.
  • the action control module includes an optical fiber isolation unit and a permanent magnet mechanism of a main circuit breaker, an electromagnetic repulsion mechanism of the main circuit breaker, an auxiliary circuit breaker, and a commutation switch connected thereto;
  • the optical fiber isolation unit is configured to obtain a control instruction sent by the central processing unit module, and send the control instruction to a main circuit breaker permanent magnet mechanism, a main circuit breaker electromagnetic repulsion mechanism, an auxiliary circuit breaker, and a converter switch. At least one component, the corresponding component performs an action corresponding to the control instruction.
  • the system further includes: a repulsive capacitor charging module configured to charge the repulsive capacitor; the repulsive capacitor is adapted to the electromagnetic repulsive force mechanism of the main circuit breaker; the repulsive capacitor Powering a repulsion coil in the electromagnetic repulsion mechanism of the main circuit breaker;
  • the central processor module is further configured to control the repulsive capacitor charging module to charge the repulsive capacitor; and is further configured to obtain voltage information of the repulsive capacitor.
  • system further includes: a status feedback indication module, a power module, an information interaction and recording module, and an anti-crash module; wherein,
  • the status feedback indication module is configured to display at least one of the following information: the opening and closing status of the main breaker, the opening and closing status of the auxiliary breaker, temperature and humidity, repulsive capacitor voltage information, and commutation capacitor voltage information; it is also configured In order to detect an input operation, the input operation is sent to the central processing unit; the input operation includes at least one of the following: operation for controlling the opening and closing of the main circuit breaker, and control for opening and closing of the auxiliary circuit breaker Operation
  • the power module is configured to provide power to the system
  • the information interaction and recording module is configured to realize communication with external equipment and recording of system operation information
  • the anti-crash module is configured to prevent the central processing unit from entering a crash state.
  • the mechanical high-voltage DC circuit breaker topology includes an auxiliary circuit breaker for cutting off residual current and three branches connected in parallel;
  • the first branch includes The main circuit breaker of the normal working current of the system, the outgoing end of the main circuit breaker is connected to the incoming end of the auxiliary circuit breaker;
  • the second branch is a current-converting branch, including a current-reacting reactance, a current-switching switch, and charging A resistor and a commutation capacitor, one end of the commutation reactance is connected to the incoming end of the main circuit breaker, the other end of the commutation reactance is connected to one end of the commutation switch, and the other of the commutation switch One end is connected to the positive electrode of the current capacitor and one end of the charging resistor, the other end of the charging resistor is grounded, and the negative electrode of the commutation capacitor is connected to the input end of the auxiliary circuit breaker;
  • the energy release branch includes a lightning
  • the main circuit breaker is a vacuum circuit breaker.
  • the lightning arrester is a metal oxide lightning arrester with a matched system voltage level.
  • it is configured to determine a current rising rate and a current increase based on the current parameter; when the current rising rate is higher than a first threshold, start a short-circuit current detection; Within the delay time, if it is detected that the current rising rate is always higher than the first threshold, a short-circuit current protection signal is sent to the central processing unit; if the current rising rate is lower than the first threshold but Higher than the second threshold, and the current increase is greater than the third threshold, sending a short-circuit current protection signal to the CPU module; the second threshold is smaller than the first threshold; if the current rise rate is lower than The second threshold value exits the short-circuit current detection protection.
  • An embodiment of the present application further provides a control method of a mechanical high-voltage DC circuit breaker control and protection system, where the method includes:
  • the central processing unit module sends an opening signal to the electromagnetic repulsion mechanism of the main circuit breaker;
  • the central processing unit module When the contact of the main circuit breaker reaches a specific opening distance, the central processing unit module sends a conduction signal to the commutation switch;
  • the central processing unit module sends a trip signal to an auxiliary circuit breaker to switch off according to a preset sequence, and cuts off the residual current;
  • the technical solution provided in the embodiments of the present application is designed with a current collection judgment module to ensure the reliability of the short-circuit current detection and judgment.
  • the software adopts a layered architecture, which enhances the simplicity and maintainability of the software, and supports the working mode and debugging mode.
  • the system uses dual power supplies to ensure the stability of the power supply, and an anti-crash module is added to prevent the system from crashing.
  • FIG. 1 is a schematic diagram of a topology structure of a mechanical high-voltage DC circuit breaker according to an embodiment of the present application
  • FIG. 2 is a block diagram of a mechanical high-voltage DC circuit breaker control and protection system design in an embodiment of the present application
  • FIG. 3 is a schematic diagram of a short-circuit current detection process of a current detection processing unit in a mechanical high-voltage DC circuit breaker control and protection system according to an embodiment of the present application;
  • FIG. 4 is a software architecture diagram of a central processor of a mechanical high-voltage DC circuit breaker control and protection system in an embodiment of the present application;
  • FIG. 5 is a flowchart of a short-circuit current interruption of a mechanical high-voltage DC circuit breaker control and protection system according to an embodiment of the present application.
  • the DC circuit breaker is an important device that can cut off the short-circuit current in order to ensure the stability of the DC grid operation.
  • the mechanical high-voltage DC circuit breaker control and protection system is to reasonably control the state of each component in the circuit breaker topology according to the design process.
  • Mechanical high-voltage DC circuit breakers are mainly composed of the main circuit breaker branch, the converter branch, the arrester branch and the auxiliary circuit breaker.
  • the topology of the mechanical high-voltage DC circuit breaker in the embodiment of the present application includes an auxiliary circuit breaker (BCB) for cutting off residual current and three branches connected in parallel.
  • the first branch includes The main circuit breaker (MCB) that passes the normal working current of the system.
  • the main circuit breaker is a vacuum circuit breaker (VCB, Vacuum Circuit Breaker).
  • VVB vacuum circuit breaker
  • the main circuit breaker adopts an electromagnetic repulsive force and a permanent magnet coupling operating mechanism.
  • the output end of the main circuit breaker is connected to the input end of the auxiliary circuit breaker.
  • the second branch is a commutation branch, including the commutation reactance L c , The commutation switch S c , the charging resistor R c , and the commutation capacitor C c .
  • One end of the commutation reactance L c is connected to the input end of the main circuit breaker, and the other end of the commutation reactance L c is connected to one end of the commutation switch S c .
  • the third branch is the energy release branch, including the arrester MOV, one end of the arrester MOV is connected to the incoming end of the main circuit breaker, and the other end of the arrester MOV is connected to the incoming end of the auxiliary circuit breaker.
  • the arrester MOV is a metal oxide arrester with a matching system voltage level.
  • FIG. 2 it is a mechanical high-voltage DC circuit breaker control and protection system in the embodiment of the application, which includes a central processing unit module, a current acquisition judgment module, a voltage information acquisition module, and an action control module connected thereto; ,
  • the current acquisition and judgment module is configured to collect current parameters in the topology of a mechanical high-voltage DC circuit breaker, determine whether a short circuit occurs according to the current parameters, and feed back a determination result to the central processor module;
  • the voltage information acquisition module is configured to collect a voltage parameter of a converter capacitor C c in the mechanical high-voltage DC circuit breaker topology and send the voltage parameter to the central processing unit module;
  • the central processor module is configured to send a control instruction to the action control module according to a determination result sent by the current collection determination module and / or a voltage parameter sent by the voltage information collection module;
  • the action control module is configured to perform at least one of the following actions according to a control instruction sent by the central processor module: opening and closing of a permanent magnet mechanism of a main circuit breaker, opening of an electromagnetic repulsion mechanism of a main circuit breaker, and auxiliary circuit breaking The on / off of the converter and the on / off of the converter switch.
  • the central processing unit module is responsible for the unified processing of information and the issuing of related action instructions.
  • the current acquisition judgment module includes a current information acquisition unit and a current detection processing unit; wherein the current acquisition judgment module is configured to acquire a mechanical high-voltage DC circuit breaker topology.
  • a current parameter, the current parameter including a current change rate and / or a current amplitude;
  • the current detection processing unit is configured to determine whether a short circuit occurs according to the current parameter, and feed back a determination result to the central processing unit.
  • the current information acquisition unit may include a Rogowski coil and a Hall current sensor and a corresponding signal conditioning circuit.
  • the Rogowski coil is responsible for collecting the current change rate
  • the Hall current sensor is responsible for collecting the current amplitude
  • the parameters collected by the Rogowski coil and the Hall current sensor can be transmitted to the current detection processing unit through a signal conditioning circuit.
  • the current detection and processing unit judges whether a short circuit occurs based on the integrated current change rate and current amplitude, and sends the corresponding determination result and current parameters to the central processing unit.
  • the action control module includes an optical fiber isolation unit and a permanent magnet mechanism of a main circuit breaker, an electromagnetic repulsion mechanism of the main circuit breaker, an auxiliary circuit breaker, and a commutation switch connected thereto.
  • the optical fiber isolation unit is configured to obtain
  • the control instruction sent by the central processing unit module sends the control instruction to at least one of a permanent magnet mechanism of the main circuit breaker, an electromagnetic repulsion mechanism of the main circuit breaker, an auxiliary circuit breaker, and a converter switch, and is executed by the corresponding component.
  • Action corresponding to a control command the main circuit breaker electromagnetic repulsion mechanism is responsible for opening under fault current; the main circuit breaker permanent magnet mechanism is responsible for closing and opening under rated current.
  • a corresponding instruction is output to each component through the optical fiber isolation unit to achieve good electrical isolation and ensure system security.
  • the system further includes a repulsive capacitor charging module configured to charge the repulsive capacitor;
  • the repulsive capacitor is adapted to the electromagnetic repulsive force mechanism of the main circuit breaker, and the repulsive capacitor is The repulsive coil in the electromagnetic repulsive force mechanism of the main circuit breaker supplies power;
  • the central processing unit module is further configured to control the repulsive capacitor charging module to charge the repulsive capacitor; and is further configured to obtain voltage information of the repulsive capacitor.
  • the repulsive capacitor charging module can charge the repulsive capacitor through a charger.
  • the central processor module can communicate with the repulsive capacitor charging module through serial communication. It can be understood that the central processor module can send control instructions to the repulsive capacitor charging module through serial communication; and obtain the repulsive force through serial communication. Capacitor voltage information.
  • system further includes: a status feedback indication module, a power module, an information interaction and recording module, and an anti-crash module; wherein,
  • the status feedback indication module is configured to display at least one of the following information: the opening and closing status of the main breaker, the opening and closing status of the auxiliary breaker, temperature and humidity, repulsive capacitor voltage information, and commutation capacitor voltage information; it is also configured In order to detect an input operation, the input operation is sent to the central processing unit; the input operation includes at least one of the following: operation for controlling the opening and closing of the main circuit breaker, and control for opening and closing of the auxiliary circuit breaker Operation
  • the power module is configured to provide power to the system
  • the anti-crash module is configured to prevent the central processing unit from entering a crash state.
  • the state feedback indication module may be provided with corresponding keys, and the user triggers the keys, so that the state feedback indication module detects an input operation.
  • the power supply module may include a working power supply unit, a backup power supply unit, and a power conversion unit, and provide power for the power supply module's mechanical high-voltage DC circuit breaker control and protection system; backup power.
  • FIG. 3 it is a schematic diagram of a short-circuit current detection process of a current detection processing unit in a mechanical high-voltage DC circuit breaker control and protection system in the embodiment of the application; the current detection processing unit is configured to determine a current based on the current parameter Rise rate and current increase; when the current rise rate is higher than the first threshold, short-circuit current detection is started; if the current rise rate is always detected to be higher than the first within a predetermined delay time A threshold value, sending a short-circuit current protection signal to the central processing unit; if the current rise rate is lower than the first threshold value but higher than a second threshold value, and the current increase is greater than a third threshold value, the central processing unit is sent to the central processing unit; The processor module sends a short-circuit current protection signal; the second threshold value is smaller than the first threshold value; if the current rise rate is lower than the second threshold value, the short-circuit current detection protection is exited.
  • the current rising rate can be obtained by dI / d
  • the short-circuit protection is started; if the current rising rate dI / dt is detected to be lower than the first after the short-circuit protection is started Two thresholds, exit the short-circuit current detection protection; if it is detected that the current rise rate dI / dt is always higher than the first threshold within a prescribed delay time, then a short-circuit current protection signal is sent; if the current rise rate dI / dt is detected A short-circuit current protection signal is sent below the first threshold but above the second threshold, and the current increase is greater than a third threshold.
  • the driver layer is responsible for accessing the underlying hardware circuits and chips, and different read and write drivers.
  • the driver layer mainly includes: system parameter configuration serial port driver, current acquisition judgment module interface driver, optocoupler interface module driver, optical fiber interface module driver, converter capacitor voltage AD conversion driver, charger communication serial port driver, and underlying read-write driver.
  • the base layer mainly includes: system parameter configuration program, level judgment program, interface module configuration program, converter capacitor voltage detection program, communication data processing program, etc .; the base layer is located on the upper layer of the driver layer and is mainly responsible for encapsulating the corresponding driver layer It becomes a program service unit, which provides a simple and flexible interface to the top-level application layer, which facilitates the realization of different functions.
  • the application layer is mainly used for: information interaction program, information judgment, status display, feedback and action execution, repulsive capacitor charging execution, information recording program, etc.
  • the software architecture of the mechanical high-voltage DC circuit breaker control and protection system supports two working modes: working mode and debugging mode. Under the working mode, the system supports the realization of multiple functions. In the debugging mode, the working parameters and status of the mechanical high-voltage DC circuit breaker can be obtained quickly and effectively, and relevant tests are performed to facilitate later maintenance and upgrade.
  • Circuit breakers (including main circuit breakers and auxiliary circuit breakers) can be divided into four working states according to their functions: rated operating state, short-circuit current breaking process, rated current breaking process, and charging process. In the above four working states, the short-circuit current breaking process is very critical.
  • FIG. 5 a short-circuit current interruption flowchart of a mechanical high-voltage DC circuit breaker control and protection system according to an embodiment of the present application is shown.
  • the control method in the embodiment of the present application includes:
  • the central processing unit module sends a trip signal to the electromagnetic repulsion mechanism of the main circuit breaker;
  • the central processing unit module When the contact of the main circuit breaker reaches a specific opening distance, the central processing unit module sends a conduction signal to the commutation switch;
  • the central processing unit module sends a trip signal to an auxiliary circuit breaker to switch off according to a preset sequence, and cuts off the residual current;
  • whether a short circuit occurs in the system is detected by the current collection judgment module; when a short circuit is detected in the system, the current collection judgment module sends a feedback judgment result and a current parameter to the central processing module.
  • the specific opening distance of the main circuit breaker contacts means that the gap of the main circuit breaker contacts has reached an appropriate opening distance capable of withstanding a transient interruption voltage (TIV, Transient Interruption Voltage).
  • TIV Transient Interruption Voltage
  • the central processing unit module sends a trip signal to the auxiliary circuit breaker to shut down and cut off the residual current according to a preset sequence, and specifically includes: the commutation switch is triggered to conduct, the commutation capacitor starts to discharge, and the current gradually starts from The main circuit breaker is transferred to the commutation branch; at this stage, the commutation capacitor is continuously discharged and its voltage is continuously reduced. This is the first commutation process. After the first commutation process is completed, the current is completely transferred to the commutation branch. The arc in the main breaker is extinguished at the zero crossing of the current, and the TIV at both ends of the main breaker will quickly increase to the first negative peak.
  • the converter capacitor continues to discharge, and the voltage across it gradually decreases to zero. After that, the converter capacitor continues to be charged, and the voltage of the converter capacitor starts to increase in the positive direction. At the same time, the two ends of the main circuit breaker also increase with the increase of the voltage across the converter capacitor. In addition, due to the stray commutation of the circuit breaker charging capacitor, the voltage across the main circuit breaker will oscillate, and the amplitude of the oscillation will gradually decrease. The voltage across the converter capacitor reaches the arrester MOV reference voltage, the arrester MOV starts to operate, and the system current starts to transfer from the commutator capacitor to the arrester MOV. The current is gradually transferred from the converter capacitor and converter switch to the arrester MOV, which is the second commutation process.
  • the current is completely transferred to the MOV branch of the arrester. At this time, the current flowing through the inverter capacitor and the inverter switch passes through zero. The current in the arrester MOV is gradually attenuated, and then the arrester MOV is turned off due to the zero current.
  • the auxiliary circuit breaker starts to operate. When the system current crosses zero, the contact gap of the auxiliary circuit breaker reaches a certain opening distance so that it can withstand the recovery voltage at both ends, and finally the circuit is closed to complete the entire opening process.
  • the mechanical high-voltage DC circuit breaker control and protection system of the embodiment of the present application uses dual power modules to supply power.
  • the working power source When the working power source is abnormal, it will switch to a standby power source for power ;
  • Add anti-crash module to monitor the running status of the processor to prevent the phenomenon of crashes; important parameters and status of the system's operation can be obtained to facilitate the evaluation of the system's operating status and take corresponding protective measures.
  • the units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, which may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above integration
  • the unit can be implemented in the form of hardware, or in the form of hardware plus software functional units.

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Abstract

本申请实施例公开了一种机械式高压直流断路器控制与保护系统及其控制方法，该系统包括：电流采集判断模块，配置为采集机械式高压直流断路器拓扑结构中的电流参数，根据所述电流参数判定是否发生短路，向所述中央处理器模块反馈判定结果和所述电流参数；电压信息采集模块，配置为采集所述机械式高压直流断路器拓扑结构中的换流电容的电压参数，将所述电压参数发送至所述中央处理器模块；中央处理器模块，配置为根据所述电流采集判断模块发送的判定结果和/或所述电压信息采集模块发送的电压参数，向所述动作控制模块发送控制指令；动作控制模块，配置为根据所述中央处理器模块发送的控制指令，执行相应动作。

Description

机械式高压直流断路器控制与保护系统及其控制方法
相关申请的交叉引用
本申请基于申请号为201811064915.3、申请日为2018年09月12日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以引入方式并入本申请。
技术领域
本申请涉及直流配电技术领域，具体涉及一种机械式高压直流断路器控制与保护系统及其控制方法。
背景技术
随着传统化石能源短缺与环境问题的不断加剧，能够实现间歇式可再生能源大规模接入的多端高压直流输电技术得到了快速的发展，也在一定程度上激励了柔性直流技术在配电侧的延伸，促进了直流配电网应用的增强。直流电网的发展对可靠性与稳定性提出了更高的要求，其中面临的巨大挑战就是短路电流的开断问题。迫切的需求与巨大的挑战促进了高压直流断路器的研究与发展。
直流断路器可分为三种类型：固态直流断路器、机械式直流断路器和混合式直流断路器。其中，机械式直流断路器由于成本低、损耗小、分断能力强等优势有着良好的研究和应用背景。
机械式高压直流断路器的控制与保护系统涉及到短路电流的快速识别、电磁斥力机构的快速动作、系统状态反馈指示、信息交互传输等方面，对机械式高压直流断路器控制与保护系统的可靠性与稳定性提出了较高的要求。近年来对机械式高压直流断路器控制与保护系统虽有研究，但存在 整体功能不完善，性能可靠性低，不能直接应用到产品中，无法满足挂网使用的需求。
发明内容
本申请实施例期望提供一种机械式高压直流断路器控制与保护系统及其控制方法。
本申请实施例提供的技术方案如下：
本申请实施例提供了一种机械式高压直流断路器控制与保护系统，所述系统包括中央处理器模块以及与其连接的电流采集判断模块、电压信息采集模块和动作控制模块；其中，
所述电流采集判断模块，配置为采集机械式高压直流断路器拓扑结构中的电流参数，根据所述电流参数判定是否发生短路，向所述中央处理器模块反馈判定结果和所述电流参数；
所述电压信息采集模块，配置为采集所述机械式高压直流断路器拓扑结构中的换流电容的电压参数，将所述电压参数发送至所述中央处理器模块；
所述中央处理器模块，配置为根据所述电流采集判断模块发送的判定结果和/或所述电压信息采集模块发送的电压参数，向所述动作控制模块发送控制指令；
所述动作控制模块，配置为根据所述中央处理器模块发送的控制指令，执行以下动作的至少之一：主断路器永磁机构的分合闸、主断路电磁斥力机构的分闸、辅助断路器的分合闸和换流开关的导通或关断。
在本申请的一种可选实施例中，所述电流采集判断模块包括电流信息采集单元和电流检测处理单元；其中，
所述电流采集判断模块，配置为采集机械式高压直流断路器拓扑结构中的电流参数，所述电流参数包括电流变化率和/或电流幅值；
所述电流检测处理单元，配置为根据所述电流参数判定是否发生短路，向所述中央处理器模块反馈判定结果。
在本申请的一种可选实施例中，所述动作控制模块包括光纤隔离单元及与其连接的主断路器永磁机构、主断路器电磁斥力机构、辅助断路器和换流开关；
所述光纤隔离单元，配置为获得所述中央处理器模块发送的控制指令，将所述控制指令发送至主断路器永磁机构、主断路器电磁斥力机构、辅助断路器和换流开关中的至少一个组件，由相应的组件执行与控制指令对应的动作。
在本申请的一种可选实施例中，所述系统还包括：斥力电容充电模块，配置为为斥力电容充电；所述斥力电容与所述主断路器电磁斥力机构适配；所述斥力电容为所述主断路器电磁斥力机构中的斥力线圈供电；
所述中央处理器模块，还配置为控制所述斥力电容充电模块为所述斥力电容充电；还配置为获取所述斥力电容的电压信息。
在本申请的一种可选实施例中，所述系统还包括：状态反馈指示模块、电源模块、信息交互与记录模块和防死机模块；其中，
所述状态反馈指示模块，配置为显示以下信息的至少之一：主断路器分合闸状态、辅助断路器的分合闸状态、温湿度、斥力电容电压信息、换流电容电压信息；还配置为检测输入操作，将所述输入操作发送至所述中央处理器模块；所述输入操作包括以下至少之一：用于控制主断路器分合闸的操作、用于控制辅助断路器分合闸的操作；
所述电源模块，配置为为系统提供电源；
所述信息交互与记录模块，配置为实现与外部设备的通信以及系统运行信息的记录；
所述防死机模块，配置为防止中央处理器模块进入死机状态。
在本申请的一种可选实施例中，所述机械式高压直流断路器拓扑结构包括用于切断剩余电流的辅助断路器及三条并联连接的支路；第一条支路包括用于导通系统正常工作电流的主断路器，所述主断路器的出线端与所述辅助断路器的进线端连接；第二条支路为换流支路，包括换流电抗、换流开关、充电电阻和换流电容，所述换流电抗的一端与所述主断路器的进线端连接，所述换流电抗的另一端与所述换流开关的一端连接，所述换流开关的另一端分别与所述流电容正极和所述充电电阻的一端连接，所述充电电阻的另一端接地，所述换流电容的负极与所述辅助断路器的进线端连接；第三条支路为能量释放支路，包括避雷器，所述避雷器的一端与所述主断路器的进线端连接，所述避雷器的另一端与所述辅助断路器的进线端连接。
在本申请的一种可选实施例中，所述主断路器采用真空断路器。
在本申请的一种可选实施例中，所述避雷器采用系统电压等级相配合的金属氧化物避雷器。
在本申请的一种可选实施例中，配置为基于所述电流参数确定电流上升率和电流增量；在所述电流上升率高于第一阈值的情况下，启动短路电流检测；在规定的延时时间内，若检测到所述电流上升率始终高于所述第一阈值，向所述中央处理器模块发送短路电流保护信号；若所述电流上升率低于所述第一阈值但高于第二阈值，且所述电流增量大于第三阈值，向所述中央处理器模块发送短路电流保护信号；所述第二阈值小于所述第一阈值；若所述电流上升率低于所述第二阈值，退出短路电流检测保护。
本申请实施例还提供了一种机械式高压直流断路器控制与保护系统的控制方法，所述方法包括：
判断是否检测到系统出现短路的反馈判定结果；
在检测到系统出现短路的反馈判定结果的情况下，中央处理器模块发 送分闸信号至主断路器电磁斥力机构；
在主断路器触头达到特定开距的情况下，所述中央处理器模块发送导通信号给换流开关；
所述中央处理器模块按照预设时序发送分闸信号至辅助断路器进行关断，切断剩余电流；
检测主断路器是否分闸，在检测到所述主断路器分闸的情况下，检测辅助断路器是否分闸，在检测到所述辅助断路器分闸的情况下，确定短路电流开断成功；在检测到所述主断路器未分闸或者所述辅助断路器未分闸的情况下、确定短路电流开断失败。
本申请实施例的有益效果是：
1.本申请实施例提供的技术方案为了保证短路电流的快速检测与判断，设计了电流采集判断模块，保障了短路电流检测判断的可靠性。
2.在多个方面增加系统整体工作的可靠性。软件采用分层架构，增强了软件的简洁性与维护性，并支持工作模式与调试模式；硬件上系统使用双电源供电，保证电源供应稳定性，增加防死机模块防止系统出现死机。
3.机械式高压直流断路器不同工作状态的动作流程清晰合理，便于控制。
附图说明
图1是本申请实施例中一种机械式高压直流断路器拓扑结构简要图；
图2是本申请实施例中机械式高压直流断路器控制与保护系统方案设计框图；
图3是本申请实施例中机械式高压直流断路器控制与保护系统中电流检测处理单元短路电流检测流程示意图；
图4是本申请实施例中机械式高压直流断路器控制与保护系统中央处理器的软件架构图；
图5是本申请实施例中机械式高压直流断路器控制与保护系统短路电流开断流程图。
具体实施方式
为使相关人员更好的理解本发明，下面会结合附图对本发明进行更加详细的阐释与说明，从而更好的应用到相关领域。
直流断路器是为了保证直流电网运行的稳定性，能够切断短路电流的重要设备。机械式高压直流断路器控制与保护系统就是根据设计流程合理控制断路器拓扑结构中各部件的状态。机械式高压直流断路器主要由主断路器支路、换流支路、避雷器支路和辅助断路器组成。
如图1所示，本申请实施例中的机械式高压直流断路器拓扑结构包括用于切断剩余电流的辅助断路器(BCB)及三条并联连接的支路，第一条支路包括用于导通系统正常工作电流的主断路器(MCB)，主断路器采用真空断路器(VCB，Vacuum Circuit Breaker)。主断路器采用电磁斥力和永磁相耦合的操动机构，主断路器的出线端与辅助断路器的进线端相连；第二条支路为换流支路，包括换流电抗L c、换流开关S c、充电电阻R c、换流电容C c，换流电抗L c的一端与主断路器的进线端连接，换流电抗L c另一端与换流开关S c的一端相连接，换流开关S c的另一端分别与换流电容C c的正极和充电电阻R c的一端连接，充电电阻R c的另一端接地，换流电容C c的负极与辅助断路器的进线端相连接；第三条支路为能量释放支路，包括避雷器MOV，避雷器MOV一端与主断路器的进线端相连接，避雷器MOV另一端与辅助断路器的进线端相连接。本实施例中，避雷器MOV采用系统电压等级相配合的金属氧化物避雷器。
如图2所示，为申请实施例中一种机械式高压直流断路器控制与保护系统，所述包括中央处理器模块以及与其连接的电流采集判断模块、电压信息采集模块和动作控制模块；其中，
所述电流采集判断模块，配置为采集机械式高压直流断路器拓扑结构中的电流参数，根据所述电流参数判定是否发生短路，向所述中央处理器模块反馈判定结果；
所述电压信息采集模块，配置为采集所述机械式高压直流断路器拓扑结构中的换流电容C c的电压参数，将所述电压参数发送至所述中央处理器模块；
所述中央处理器模块，配置为根据所述电流采集判断模块发送的判定结果和/或所述电压信息采集模块发送的电压参数，向所述动作控制模块发送控制指令；
所述动作控制模块，配置为根据所述中央处理器模块发送的控制指令，执行以下动作的至少之一：主断路器永磁机构的分合闸、主断路电磁斥力机构的分闸、辅助断路器的分合闸和换流开关的导通或关断。
本实施例中，中央处理器模块负责信息的统一处理与相关动作指令的发出。
在本申请的一种可选实施例中，所述电流采集判断模块包括电流信息采集单元和电流检测处理单元；其中，所述电流采集判断模块，配置为采集机械式高压直流断路器拓扑结构中的电流参数，所述电流参数包括电流变化率和/或电流幅值；
所述电流检测处理单元，配置为根据所述电流参数判定是否发生短路，向所述中央处理器模块反馈判定结果。
本实施例中，作为一种示例，所述电流信息采集单元可包括罗氏线圈和霍尔电流传感器及其对应的信号调理电路。其中，罗氏线圈负责采集电流变化率，霍尔电流传感器负责采集电流幅值；罗氏线圈和霍尔电流传感器采集的参数可通过信号调理电路后传输至电流检测处理单元。电流检测处理单元综合电流变化率与电流幅值判断是否发生短路并将相应的判定结 果和电流参数发送至所述中央处理器模块。
本实施例中，所述动作控制模块，包括光纤隔离单元及与其连接的主断路器永磁机构、主断路器电磁斥力机构、辅助断路器和换流开关，所述光纤隔离单元，配置为获得所述中央处理器模块发送的控制指令，将所述控制指令发送至主断路器永磁机构、主断路器电磁斥力机构、辅助断路器和换流开关中的至少一个组件，由相应的组件执行与控制指令对应的动作。其中，主断路器电磁斥力机构负责故障电流下的分闸；主断路器永磁机构负责合闸和额定电流下的分闸。本实施例通过光纤隔离单元向各组件输出相应指令，实现良好的电气隔离，保障系统安全。
在本申请的一种可选实施例中，所述系统还包括斥力电容充电模块，配置为为斥力电容充电；所述斥力电容与所述主断路器电磁斥力机构适配，所述斥力电容为所述主断路器电磁斥力机构中的斥力线圈供电；所述中央处理器模块，还配置为控制所述斥力电容充电模块为所述斥力电容充电；还配置为获取所述斥力电容的电压信息。
本实施例中，所述斥力电容充电模块可通过充电机为斥力电容充电。所述中央处理器模块可通过串口通信的方式与斥力电容充电模块进行信息交互，可以理解，中央处理器模块可通过串口通信的方式向斥力电容充电模块发送控制指令；通过串口通信的方式获取斥力电容的电压信息。
在本申请的一种可选实施例中，所述系统还包括：状态反馈指示模块、电源模块、信息交互与记录模块和防死机模块；其中，
所述状态反馈指示模块，配置为显示以下信息的至少之一：主断路器分合闸状态、辅助断路器的分合闸状态、温湿度、斥力电容电压信息、换流电容电压信息；还配置为检测输入操作，将所述输入操作发送至所述中央处理器模块；所述输入操作包括以下至少之一：用于控制主断路器分合闸的操作、用于控制辅助断路器分合闸的操作；
所述电源模块，配置为为系统提供电源；
所述信息交互与记录模块，配置为实现与外部设备的通信以及系统运行信息的记录；
所述防死机模块，配置为防止中央处理器模块进入死机状态。
本实施例中，所述状态反馈指示模块可设置有对应的按键，用户触发按键，使得状态反馈指示模块检测到输入操作。
本实施例中，电源模块可包括工作电源单元、备用电源单元和电源转换单元，为所述电源模块可机械式高压直流断路器控制与保护系统提供电源；并在工作电源工作异常的情况下提供备用电源。
如图3所示，为申请实施例中一种机械式高压直流断路器控制与保护系统中电流检测处理单元短路电流检测流程示意图；所述电流检测处理单元，配置为基于所述电流参数确定电流上升率和电流增量；在所述电流上升率高于第一阈值的情况下，启动短路电流检测；在规定的延时时间内，若检测到所述电流上升率始终高于所述第一阈值，向所述中央处理器模块发送短路电流保护信号；若所述电流上升率低于所述第一阈值但高于第二阈值，且所述电流增量大于第三阈值，向所述中央处理器模块发送短路电流保护信号；所述第二阈值小于所述第一阈值；若所述电流上升率低于所述第二阈值，退出短路电流检测保护。其中，所述电流上升率可通过dI/dt得到；I表示电流值。
本实施例中，如图3所示，在电流上升率dI/dt大于第一阈值的情况下，启动短路保护；在启动短路保护后，若检测到电流上升率dI/dt低于所述第二阈值，退出短路电流检测保护；若检测到电流上升率dI/dt在规定的延时时间内始终高于所述第一阈值，则发送短路电流保护信号；若检测到电流上升率dI/dt低于所述第一阈值但高于第二阈值，且所述电流增量大于第三阈值，发送短路电流保护信号。
如图4所示，为本申请实施例在断路器的软件设计上采用了分层的思想，整个软件架构从上到下依次为应用层、基础层和驱动层。驱动层负责对底层硬件电路和芯片的访问以及不同的读写驱动。驱动层主要包括：系统参数配置串口驱动、电流采集判断模块接口驱动、光耦接口模块驱动、光纤接口模块驱动、换流电容电压AD转换驱动、充电机通信串口驱动和底层读写驱动。基础层主要包括：系统参数配置程序、电平判断程序、接口模块配置程序、换流电容电压检测程序、通信数据处理程序等；基础层位于驱动层的上层，主要负责将相对应的驱动层封装成程序服务单元，给顶层的应用层提供简单灵活的接口，便于实现不同功能。应用层主要用于：信息交互程序、信息判断、状态显示、反馈与动作执行、斥力电容充电执行、信息记录程序等等。
为了保证系统的安全性和后期维护的便利性，在机械式高压直流断路器控制与保护系统的软件架构支持使用工作模式和调试模式两种工作模式，在工作模式下系统支持多种功能的实现，而在调试模式下可快速有效的获取机械式高压直流断路器的工作参数与状态，并进行相关的测试，便于后期的维护与升级。
断路器(可包括主断路器和辅助断路器)根据功能可分为四种工作状态：额定工作状态、短路电流开断过程、额定电流开断过程和充电过程。在上述四种工作状态中，短路电流开断过程是非常关键的。
如图5所示，为本申请实施例中机械式高压直流断路器控制与保护系统短路电流开断流程图。根据上述的机械式高压直流断路器控制与保护系统，本申请实施例的控制方法包括：
判断是否检测到系统出现短路的反馈判定结果；
在检测到系统出现短路的反馈判定结果的情况下，中央处理器模块发送分闸信号至主断路器电磁斥力机构；
在主断路器触头达到特定开距的情况下，所述中央处理器模块发送导通信号给换流开关；
所述中央处理器模块按照预设时序发送分闸信号至辅助断路器进行关断，切断剩余电流；
检测主断路器是否分闸，在检测到所述主断路器分闸的情况下，检测辅助断路器是否分闸，在检测到所述辅助断路器分闸的情况下，确定短路电流开断成功；在检测到所述主断路器未分闸或者所述辅助断路器未分闸的情况下、确定短路电流开断失败
本实施例中，通过电流采集判断模块检测系统是否出现短路；在检测到系统出现短路的情况下，电流采集判断模块向中央处理模块发送反馈判定结果和电流参数。
本实施例中，主断路器触头达到特定开距指主断路器触头间隙达到能够承受瞬态开断电压(TIV，Transient Interruption Voltage)的合适开距。
本实施例中，所述中央处理器模块按照预设时序发送分闸信号至辅助断路器进行关断，切断剩余电流，具体包括：换流开关触发导通，换流电容开始放电，电流逐渐从主断路器转移至换流支路中；在这个阶段，换流电容持续放电，其电压不断降低，这是第一个换流过程。第一个换流过程结束后电流完全转移至换流支路中，主断路器中的电弧在电流过零点熄灭，主断路器两端TIV将迅速增加至第一个负向峰值。换流电容持续放电，其两端电压逐渐减小至零。此后，换流电容继续充电，换流电容的电压开始正向增加，同时，主断路器两端也伴随着换流电容两端电压的增加而增加。另外，由于断路器杂散换流充电电容的原因，主断路器两端电压会发生振荡，振荡幅值会逐渐减小。换流电容两端电压达到避雷器MOV参考电压，避雷器MOV开始动作，系统电流开始从换流电容转移至避雷器MOV。电流逐渐从换流电容和换流开关中转移至避雷器MOV中，这是第二个换 流过程。电流完全转移至避雷器MOV支路，这时流过换流电容和换流开关中的电流过零。避雷器MOV中的电流逐渐衰减，此后避雷器MOV因电流过零而关断。辅助断路器开始动作，当系统电流过零时，辅助断路器触头间隙达到一定的开距从而可以承受其两端的恢复电压，最终关断电路，完成整个开断过程。
为了保证机械式高压直流断路器的可靠性与稳定性，本申请实施例的机械式高压直流断路器控制与保护系统采用双电源模块进行供电，当工作电源异常时，会切换到备用电源进行供电；增加防死机模块监控处理器运行状态，防止出现死机现象；可获取系统的运行的重要参数与状态，便于对系统的运行状态进行评估，并采取相应的保护措施。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统和方法，可以通过其它的方式实现。以上所描述的系统实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，如：多个单元或组件可以结合，或可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的各组成部分相互之间的耦合、或直接耦合、或通信连接可以是通过一些接口，设备或单元的间接耦合或通信连接，可以是电性的、机械的或其它形式的。
上述作为分离部件说明的单元可以是、或也可以不是物理上分开的，作为单元显示的部件可以是、或也可以不是物理单元，即可以位于一个地方，也可以分布到多个网络单元上；可以根据实际的需要选择其中的部分或全部单元来实现本实施例方案的目的。
另外，在本发明各实施例中的各功能单元可以全部集成在一个处理单元中，也可以是各单元分别单独作为一个单元，也可以两个或两个以上单元集成在一个单元中；上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
以上仅为本申请的实施例而已，并不用于限制本申请，凡在本申请的精神和原则之内，所做的任何修改、等同替换、改进等，均包含在申请待批的本申请的权利要求范围之内。

Claims (10)

  1. 一种机械式高压直流断路器控制与保护系统，所述系统包括：中央处理器模块以及与其连接的电流采集判断模块、电压信息采集模块和动作控制模块；
    所述电流采集判断模块，配置为采集机械式高压直流断路器拓扑结构中的电流参数，根据所述电流参数判定是否发生短路，向所述中央处理器模块反馈判定结果和所述电流参数；
    所述电压信息采集模块，配置为采集所述机械式高压直流断路器拓扑结构中的换流电容的电压参数，将所述电压参数发送至所述中央处理器模块；
    所述中央处理器模块，配置为根据所述电流采集判断模块发送的判定结果和/或所述电压信息采集模块发送的电压参数，向所述动作控制模块发送控制指令；
    所述动作控制模块，配置为根据所述中央处理器模块发送的控制指令，执行以下动作的至少之一：主断路器永磁机构的分合闸、主断路电磁斥力机构的分闸、辅助断路器的分合闸和换流开关的导通或关断。
  2. 根据权利要求1所述的机械式高压直流断路器控制与保护系统，其中，所述电流采集判断模块包括电流信息采集单元和电流检测处理单元；其中，
    所述电流采集判断模块，配置为采集机械式高压直流断路器拓扑结构中的电流参数，所述电流参数包括电流变化率和/或电流幅值；
    所述电流检测处理单元，配置为根据所述电流参数判定是否发生短路，向所述中央处理器模块反馈判定结果。
  3. 根据权利要求1所述的机械式高压直流断路器控制与保护系统，其中，所述动作控制模块包括光纤隔离单元及与其连接的主断路器永磁机构、 主断路器电磁斥力机构、辅助断路器和换流开关；
    所述光纤隔离单元，配置为获得所述中央处理器模块发送的控制指令，将所述控制指令发送至主断路器永磁机构、主断路器电磁斥力机构、辅助断路器和换流开关中的至少一个组件，由相应的组件执行与控制指令对应的动作。
  4. 根据权利要求3所述的机械式高压直流断路器控制与保护系统，其中，所述系统还包括：斥力电容充电模块，配置为为斥力电容充电；所述斥力电容与所述主断路器电磁斥力机构适配；所述斥力电容为所述主断路器电磁斥力机构中的斥力线圈供电；
    所述中央处理器模块，还配置为控制所述斥力电容充电模块为所述斥力电容充电；还配置为获取所述斥力电容的电压信息。
  5. 根据权利要求1至4任一项所述的机械式高压直流断路器控制与保护系统，其中，所述系统还包括：状态反馈指示模块、电源模块、信息交互与记录模块和防死机模块；其中，
    所述状态反馈指示模块，配置为显示以下信息的至少之一：主断路器分合闸状态、辅助断路器的分合闸状态、温湿度、斥力电容电压信息、换流电容电压信息；还配置为检测输入操作，将所述输入操作发送至所述中央处理器模块；所述输入操作包括以下至少之一：用于控制主断路器分合闸的操作、用于控制辅助断路器分合闸的操作；
    所述电源模块，配置为为系统提供电源；
    所述信息交互与记录模块，配置为实现与外部设备的通信以及系统运行信息的记录；
    所述防死机模块，配置为防止中央处理器模块进入死机状态。
  6. 根据权利要求1所述的机械式高压直流断路器控制与保护系统，其中，所述机械式高压直流断路器拓扑结构包括用于切断剩余电流的辅助断 路器及三条并联连接的支路；
    第一条支路包括用于导通系统正常工作电流的主断路器，所述主断路器的出线端与所述辅助断路器的进线端连接；
    第二条支路为换流支路，包括换流电抗、换流开关、充电电阻和换流电容，所述换流电抗的一端与所述主断路器的进线端连接，所述换流电抗的另一端与所述换流开关的一端相连，所述换流开关的另一端分别与所述换流电容正极和所述充电电阻的一端连接，所述充电电阻的另一端接地，所述换流电容的负极与所述辅助断路器的进线端连接；
    第三条支路为能量释放支路，包括避雷器，所述避雷器的一端与所述主断路器进线端连接，所述避雷器另一端与辅助断路器的进线端连接。
  7. 根据权利要求6所述的机械式高压直流断路器控制与保护系统，其中，所述主断路器为真空断路器。
  8. 根据权利要求6所述的机械式高压直流断路器控制与保护系统，其中，避雷器采用系统电压等级相配合的金属氧化物避雷器。
  9. 根据权利要求2所述的机械式高压直流断路器控制与保护系统，其中，所述电流检测处理单元，配置为基于所述电流参数确定电流上升率和电流增量；在所述电流上升率高于第一阈值的情况下，启动短路电流检测；在规定的延时时间内，若检测到所述电流上升率始终高于所述第一阈值，向所述中央处理器模块发送短路电流保护信号；若所述电流上升率低于所述第一阈值但高于第二阈值，且所述电流增量大于第三阈值，向所述中央处理器模块发送短路电流保护信号；所述第二阈值小于所述第一阈值；若所述电流上升率低于所述第二阈值，退出短路电流检测保护。
  10. 一种机械式高压直流断路器控制与保护系统的控制方法，所述方法包括：
    判断是否检测到系统出现短路的反馈判定结果；
    在检测到系统出现短路的反馈判定结果的情况下，中央处理器模块发送分闸信号至主断路器电磁斥力机构；
    在主断路器触头达到特定开距的情况下，所述中央处理器模块发送导通信号给换流开关；
    所述中央处理器模块按照预设时序发送分闸信号至辅助断路器进行关断，切断剩余电流；
    检测主断路器是否分闸，在检测到所述主断路器分闸的情况下，检测辅助断路器是否分闸，在检测到所述辅助断路器分闸的情况下，确定短路电流开断成功；在检测到所述主断路器未分闸或者所述辅助断路器未分闸的情况下、确定短路电流开断失败。
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