WO2015103883A1

WO2015103883A1 - Integrated high-voltage alternating-current circuit breaker controller

Info

Publication number: WO2015103883A1
Application number: PCT/CN2014/085348
Authority: WO
Inventors: 宋玉锋; 姚卫东; 沈卫峰; 丁菊; 顾曹新; 顾明锋; 孟领刚; 王春华; 王新明; 单金明; 朱永书; 徐晓娴; 夏武; 王春生; 周江
Original assignee: 江苏现代电力科技股份有限公司
Priority date: 2014-01-13
Filing date: 2014-08-27
Publication date: 2015-07-16
Also published as: CN103779965B; CN103779965A

Abstract

An integrated high-voltage alternating-current circuit breaker controller, comprising a controller main body, a proximitor and a stroke detection circuit, wherein the controller main body comprises a first microprocessor circuit and a switching-off and switching-on control circuit. The controller main body is connected with an external power source thereof, a distribution voltage transformer, a current transformer of the load of a circuit breaker, and a switching-off and switching-on operation assembly arranged in the circuit breaker through an electrical connection line; the controller main body is connected with the proximitor through a communication channel; the stroke detection circuit is connected to the first microprocessor circuit; the first microprocessor circuit is connected to the switching-off and switching-on control circuit; and the controller main body is connected to the switching-off and switching-on operation assembly of the circuit breaker. The controller main body sends out a switching-off instruction signal or a switching-on instruction signal in order to start the switching-off and switching-on operation assembly to control the switching-off operation or switching-on operation of the circuit breaker. The controller is fully functional and has a strong electromagnetic interference resistance, and conducts reliable protection when a short-circuit failure occurs in a load, so that the circuit breaker can be accurately controlled.

Description

Integrated high voltage AC breaker controller

Technical field

The invention relates to the technical field of electric power, in particular to an integrated high-voltage AC circuit breaker controller.

Background technique

At present, the domestic control unit used as power distribution or motor protection in the industrial field has basically reached the international level in the 1990s, and can process various signals in real time to realize various protection characteristics and numerous auxiliary functions. The circuit breaker is one of the main protective appliances in the power distribution system, and it is also the most complete protection appliance. In recent years, the miniaturization of circuit breakers has become a trend, but more importantly, in order to meet the development needs of smart grids, the level of intelligent circuit breakers has been continuously upgraded. As the intelligent controller of the circuit breaker brain, its functions are more and more abundant and more and more complicated. In particular, the protection function not only realizes the traditional three-stage protection and ground fault protection, but also realizes various protection functions such as current imbalance protection, current protection, over-voltage protection, reverse power protection, etc. Applications for a variety of occasions.

The main shortcomings of the existing circuit breaker controller are unreasonable structural design, unreasonable circuit design, unsatisfactory integration effect of the circuit breaker, poor anti-strong electromagnetic interference capability, and large current generated when a short-circuit fault occurs at the load end. The intelligent protection function is invalidated and the fault range is expanded; the function is incomplete, and the circuit breaker has poor practicability after being applied to the circuit breaker; the automatic control performance is imperfect, and the movable contact movement of the circuit breaker cannot be accurately controlled, so the current speed cannot be realized. Cutting phase separation and phase selection reclosing cause the current speed cutting and reclosing to cause serious impact and damage to the power grid, load and equipment itself.

Therefore, there is a lack of an integrated high-voltage AC circuit breaker controller with complete functions, strong anti-electromagnetic interference capability, reliable protection in the event of load short-circuit faults, and precise control of the switching switch moving contact movement.

Summary of the invention

The object of the present invention is to provide an integrated high-voltage AC circuit breaker controller with complete functions, strong anti-electromagnetic interference capability, reliable protection in the event of a load short-circuit fault, and precise control of the switching switch moving contact motion.

To achieve the above technical object, the technical solution provided by the present invention is: an integrated high-voltage AC circuit breaker controller, comprising a controller body, a pre-positioner and a stroke detecting circuit, the controller body comprising a first microprocessor circuit and Split and close control circuit;

The controller body is connected to the external power source, the distribution voltage transformer, the current transformer of the circuit breaker load, and the opening and closing operation component disposed in the circuit breaker through the electrical connection line; the controller body passes through the communication channel Connected to the front end; the stroke detecting circuit is connected to the first microprocessor circuit; the first microprocessor circuit is connected to the opening and closing control circuit; and the controller main body and the circuit breaker are separated The brake operation component is connected; the controller body issues a trip command signal or a closing command signal, and activates the opening and closing operation component to control the opening or closing operation of the circuit breaker.

Further, the controller body further includes a three-phase AC voltage phase detecting circuit, a current pre-processing circuit, a current backup protection circuit, a working power circuit, a standby working power circuit, and an OR gate property circuit; and the three-phase AC voltage phase detection The circuit, the current pre-processor circuit and the current backup protection circuit are respectively connected to the first microprocessor circuit through an electrical connection line; the current pre-processing circuit passes through the first closing and controlling circuit and the minute via the first microprocessor circuit The closing operation component is connected; the current backup protection circuit is connected to the opening and closing operation component through a sectional closing control circuit; the external power supply is connected with the working power supply circuit, the distribution voltage transformer and the standby work The power supply circuit is connected; the working power supply circuit and the standby working power supply circuit are connected to the micro processing circuit through an OR gate property circuit; and the input end of the three-phase AC voltage phase detection circuit is connected to an external distribution voltage transformer The output is connected to the microprocessor circuit; the current pre-processing circuit and the current backup Circuits connected to the current transformer.

Further, the preamplifier is further provided with a second microprocessor circuit and a second electrical isolation device; the controller body is provided with a first electrical isolation device; the communication channel passes through the first electrical isolation device and A microprocessor circuit is coupled; the communication channel is coupled to the second microprocessor circuit by a second electrical isolation device.

Further, the front end device further includes a front panel for a front panel and a rear panel for a front end; the front panel is provided with a liquid crystal touch screen, a function pressure plate, a human body infrared sensor, and a closing operation button. a remote and main body operation switch, one or more indicator lights and a first temperature and humidity sensor; the front device is provided with a second temperature and humidity sensor on the rear panel; the liquid crystal touch screen, the function pressure plate, the human body infrared sensor, and the separation The gate operation button, the remote and body operation changeover switch, the one or more indicator lights, the first temperature and humidity sensor, and the second temperature and humidity sensor are respectively connected to the second microprocessor circuit.

Further, the preamplifier is further provided with a GPRS communication module and an RF radio frequency communication module; the GPRS communication module and RF The radio frequency communication module is respectively connected to the second micro-controller circuit; after the human body infrared sensing sensor senses that the human body is close, the second micro-processing circuit controls the liquid crystal touch screen display, and after the human body leaves, the second microprocessor circuit controls the liquid crystal touch screen extension Closed when.

Further, the opening and closing operation component includes a first opening and closing state contact, a second opening and closing state contact, a tripping coil, a closing coil, a switching power supply, a closing control outlet device, and an opening control outlet. The device, the opening and closing control driving circuit, the first anti-jumping relay and the second anti-jumping relay; the opening and closing control driving circuit, the opening control outlet device, the second anti-skip relay, the first opening and closing state contact, The opening coil and the opening and closing power supply form a trip circuit; the opening and closing control driving circuit is connected with the control end of the opening control outlet device; the opening control outlet device, the second anti-jump relay, and the opening state The contact point, the opening coil and the switching power supply are sequentially connected; the opening and closing control driving circuit, the closing control exit device, the first anti-jump relay, the second opening and closing state contact, the closing coil and the closing and closing The power supply constitutes a closing circuit; the opening and closing control driving circuit is connected with the control end of the closing control outlet device; the closing control outlet device, the first anti-jump relay, the closing state contact, Partial closing and opening coil power supply are connected in sequence;

The closing control outlet device and the opening control outlet device are power-off electronic devices.

Further, the power electronic device is an IGBT tube or a MOS a tube or a high-power transistor or a turn-off thyristor; a first on-off detection circuit is disposed on the closing circuit, the first on-off detection circuit is connected to the first opto-isolation device; a second on-off detection circuit, the second on-off detection circuit is connected to the second opto-isolation device; the output ends of the first opto-isolation device and the second opto-isolation device are respectively associated with the first microprocessor circuit connection.

Further, the first microprocessor circuit sends a trip command signal, and the trip command signal is driven by the switch-on control drive circuit to drive the trip control exit device, thereby controlling the trip coil to open the circuit breaker The first switching state contact sends the opening state signal to the first microprocessor circuit; the first microprocessor circuit sends a closing command signal, and is driven and closed after being received by the switching control drive circuit The outlet device is controlled to control the closing coil to close the circuit breaker, and the second opening and closing state contact sends the closing state signal to the first microprocessor circuit.

Further, the opening and closing operation component further includes a current detecting circuit for monitoring a current value of the opening coil or the closing coil in the opening and closing process; the current detecting circuit is disposed at a meeting point of the opening and closing circuit The current detecting circuit is connected to the first microprocessor circuit.

Further, when a short circuit fault occurs at the load end of the circuit breaker, the current transformer transmits the detected current signal to the first microprocessor circuit via the current preprocessing circuit, and the first microprocessor circuit is opened. The command signal is transmitted to the opening and closing control circuit to control the opening and closing coil of the opening and closing operation component to open the circuit breaker.

Further, the current backup protection circuit includes a first potentiometer, a second potentiometer, a third potentiometer, a first opto-isolator device, a second opto-isolator device, a third opto-isolator device, a working power supply, and a current test connector. The first opto-isolation device is connected to a current transformer of a load terminal of the circuit breaker via a first potentiometer; the second opto-isolation device is connected to a current transformer of a load terminal of the circuit breaker via a second potentiometer; The photoelectric isolation device is connected to the current transformer of the load end of the circuit breaker via a third potentiometer; the first potentiometer, the second potentiometer and the third potentiometer are respectively connected to the current test connection; the first The output ends of the photoelectric isolation device, the second photoelectric isolation device, and the third photoelectric isolation device are respectively connected to the working power source, the first microprocessor circuit, and the switching control circuit.

Further, an electromagnetic shielding device and an electrical connection line are disposed outside the main body of the controller; the electromagnetic shielding device includes a surrounding panel, a front panel for the electromagnetic shielding device, a rear panel for the electromagnetic shielding device; and a front panel for the electromagnetic shielding device And the rear panel of the electromagnetic shielding device is respectively connected to the surrounding panel through the fixing member; the surrounding panel for the surrounding panel and the electromagnetic shielding device and the rear panel for the electromagnetic shielding device are double or double metal plates; the electromagnetic shielding The device is provided with an anti-vibration connecting member and a circuit board; the circuit board is a motherboard and a plug-in board; the motherboard and the plug-in board are provided with connectors; the plug-in board is matched with the motherboard by the connector; The electromagnetic shielding device is provided with a cable hole on the rear panel, and the electrical connection cable is directly connected to the motherboard through the cable hole.

Further, the metal plate is a double layer, the inner layer is an aluminum plate, and the outer layer is an iron plate; the switching power supply is provided with a capacitor; the electrical connection line is a cable having a metal shielding layer, The shielding layer of the cable is connected to the electromagnetic shielding device via the mother board ground layer.

A current backup protection circuit for an integrated high-voltage AC circuit breaker controller, the current backup protection circuit comprising a first potentiometer, a second potentiometer, a third potentiometer, a first opto-isolation device, and a second opto-isolation a device, a third optoelectronic isolation device, an operating power supply and a current test connection; the first opto-isolation device is coupled to a current transformer at a load end of the circuit breaker via a first potentiometer; the second opto-isolation device is via a second The potentiometer is connected to the current transformer of the load end of the circuit breaker; the photoelectric isolation device is connected to the current transformer of the load end of the circuit breaker via the third potentiometer; the first potentiometer, the second potentiometer, the third The potentiometer is respectively connected to the current test connection; the working power source, the first microprocessor circuit and the switch control circuit are respectively outputted with the first photoelectric isolation device, the second photoelectric isolation device, and the third photoelectric isolation device Connected.

Further, the A pole of the first opto-isolation device is connected to the current transformer of the load terminal of the first potentiometer and the opening and closing operation component. Connected to the end, the K pole of the first opto-isolation device is connected to the N terminal of the current transformer; the A pole of the second opto-isolation device is connected to the load current transformer of the circuit breaker via the second potentiometer B Connected to the terminal, the K-pole of the second opto-isolation device is connected to the N-term of the current transformer; the A-pole of the third opto-isolator device is connected to the load-end current transformer of the circuit breaker via the third potentiometer C The terminals are connected, and the K-pole of the third optoelectronic isolation device is connected to the N-terminal of the current transformer.

The working method of a current backup protection circuit of the present invention comprises the following steps:

(1) the current transformer detects a current signal;

(2) the current signal detected by the current transformer is output to a current backup protection circuit;

(3 When the detected current signal exceeds the protection starting current value of the current backup protection circuit, the current backup protection circuit outputs the signal to the switching control circuit;

(4) The opening and closing control circuit controls the opening and closing coil in the opening and closing operation component in the circuit breaker to open the circuit breaker.

The working method of the phase selection opening and phase selection reclosing of the invention comprises the following steps:

( 1 When the single-phase ground or the two-phase short circuit, the current pre-processor circuit and the voltage phase detecting circuit detect the short-circuited phase signal and the faulty voltage zero-crossing signal;

( 2 And transmitting, by the first microprocessor circuit, the signal of the short circuit and the signal of the faulty voltage zero crossing Analysis, judging the phase difference of the short circuit and the zero crossing of the fault voltage;

(3) the stroke detecting circuit detects the opening and closing time of the circuit breaker, and obtains a closing time signal;

( 4 The splitting and closing time signal is transmitted to the first microprocessor circuit, and the first microprocessor circuit controls the opening and closing operation component to make the circuit breaker switch closing point in the short circuit fault phase alternating voltage Zero point, the phase selection opening operation and the phase selection reclosing operation are performed.

The invention has the advantages of simple structure, convenient use, complete functions, strong anti-electromagnetic interference capability, reliable protection in the event of a load short-circuit fault, and precise control of the switching movable contact movement of the circuit breaker. According to the circuit breaker's switching and closing time measured by the switch's switching contact displacement detection circuit, the circuit breaker switch is divided and closed, so that the circuit breaker switch is divided and closed at the time of the short-circuit fault phase AC voltage. Zero-crossing, realizing current-type fault protection phase selection and fault phase selection reclosing, compared with the prior art, greatly reducing the serious impact and damage caused by current type fault opening and reclosing to the grid, load and equipment itself. The circuit breaker controller realizes online monitoring of the main circuit components of the circuit breaker, detects faults early, and timely processes to avoid grid accidents.

DRAWINGS

Figure 1 is a schematic diagram of the circuit of the present invention;

Figure 2 is a schematic view of the circuit breaker circuit of the present invention;

3 is a schematic diagram of a current backup protection circuit of the present invention;

Figure 4 is a schematic structural view of the outer casing of the present invention;

Figure 5 is an infrared sensing detection circuit on the front end of the present invention;

Figure 6 is a fiber optic communication receiving circuit on the front end of the present invention;

Figure 7 is a fiber optic communication transmitting circuit on the preamplifier of the present invention;

Wherein: 1 controller body; 2 preamplifier; 3 first microprocessor circuit; 4 split closing control circuit; 5 stroke detection circuit; 6 first electrical isolation circuit; 7 current backup protection circuit; 8 standby working power circuit; 9 working power circuit; 10 open closing operation component; 11 first opening and closing state contact; Opening coil; 13 closing coil; 14 OR gate property circuit; 15 power supply; 16 distribution voltage transformer; 17 three-phase AC voltage phase detection circuit; 18 second microprocessor circuit; Second electrical isolation circuit; 20 LCD touch screen; 21 function pressure plate; 22 human body infrared sensor; 23 first temperature and humidity sensor; 24 current transformer; 25 current preprocessor circuit; 26 closing control outlet device; 27 opening control output device; 28 first anti-jump relay; 29 second anti-jump relay; 30 current detecting circuit; 31 switching control drive circuit; a first optoelectronic isolation device; 33 a second opto-isolation device; 34 a first on-off detection circuit; 35 a second on-off detection circuit; 36 a first potentiometer; 37 a second potentiometer; 38 a third potentiometer; 39 first optoelectronic isolation device; 40 second optoelectronic isolation device; 41 third optoelectronic isolation device; 42 power supply circuit; 43 current test connection; 44 front panel for electromagnetic shielding; Rear panel for electromagnetic shielding; 46 iron plate; 47 aluminum plate; 48 seismic connection; 49 motherboard; 50 four-panel panel; 51 connector; 52 cable; 53 communication channel; Second temperature and humidity sensor; 55GPRS communication module; 56RF RF communication module; 57 convergence point; 58 board; 59 working power supply; 60 second switching state contact; Second filter circuit; 62 feedback circuit; 63 signal processing circuit; 64 output circuit; 65 fiber receiving head; 66 first filter circuit; 67 first amplifying circuit; First signal conditioning circuit; 69 first central processing unit communication port; 70 second central processing unit communication port; 71 second amplifying circuit; 72 second signal conditioning circuit; 73 driving circuit; Fiber optic transmitter.

detailed description

In order to clarify the technical solutions and technical objects of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in FIG. 1 to FIG. 4, an integrated high-voltage AC circuit breaker controller of the present invention includes a controller main body 1 and a front end 2 And the stroke detecting circuit 5, the controller main body 1 includes a first microprocessor circuit 3 and a switching control circuit 4; the controller main body 1 is electrically connected to an external power source thereof 15 The distribution voltage transformer 16 , the current transformer of the circuit breaker load 24 and the opening and closing operation component 10 disposed in the circuit breaker are connected; the controller body 1 passes through the communication channel 53 and the front end 2 Connected; the stroke detecting circuit 5 is connected to the first microprocessor circuit 3; the first microprocessor circuit 3 is connected to the switching control circuit 4; the controller body 1 Connected to the opening and closing operation component 10 of the circuit breaker; the controller body 1 issues a opening command signal or a closing command signal to activate the opening and closing operation component 10 Control the opening or closing operation of the circuit breaker. The controller main body 1 is installed in the circuit breaker, and the connection with the circuit breaker electrical connection line is short, and the anti-interference is strong, and the front end device 2 Installed in a safe and easy to observe, operate place for human-machine contact, travel detection circuit 5 Installed on the moving contact drive rod of the circuit breaker switch, used to monitor the mechanical movement parameters of the circuit breaker, electrical isolation circuit, shielded cable, shielded casing and other measures to enhance electromagnetic compatibility and overcome the existing resistance in existing products. Poor interference capability leads to the problem of grid safety accidents caused by the failure of the intelligent protection function when a short-circuit fault occurs at the load end.

The controller body 1 further includes a three-phase AC voltage phase detecting circuit 17, a current pre-processing circuit 25, and a current backup protection circuit. , working power circuit 9 , standby working power circuit 8 and OR gate property circuit 14 ; OR gate property circuit 14 output as the operating power of the circuit in the main body of the controller 1 , the standby working power circuit 8 And the working power circuit 9 is normal or one of the faults or the gate property circuit 14 has an output, so that the power reliability of the controller main body 1 is improved, as the original 99%, increased to 99.99% .

The three-phase AC voltage phase detecting circuit 17, the current pre-processor circuit 25, and the current backup protection circuit 7 The first microprocessor circuit 3 is connected to each other through an electrical connection line; the current pre-processing circuit 25 is passed through the first microprocessor circuit 3 through the switching control circuit 4 and the opening and closing operation component 10 The current backup protection circuit 7 is connected to the opening and closing operation component 10 through a switching control circuit 4; the external power supply 15 is connected to the working power supply circuit 9; the distribution voltage transformer 16 is connected to the standby working power circuit 8; the working power circuit 9 and the standby operating power circuit 8 pass the OR gate property circuit 14 and the microprocessor circuit 3 The input terminal of the three-phase AC voltage phase detecting circuit 17 is connected to the external distribution voltage transformer 16, and the output terminal is connected to the microprocessor circuit 3; the current preprocessing circuit 25 The current backup protection circuit 7 is connected to the current transformer 24, respectively.

Circuit breaker stroke detection circuit 5 The measured closing time of the circuit breaker is controlled to close and close the switch of the circuit breaker, so that the time point of the circuit breaker switch is closed and closed at the zero point of the short circuit fault phase alternating current voltage, and the current type fault protection phase selection opening and closing is realized. The fault phase selection is reclosed, the circuit is simple, and the algorithm is simple, which greatly reduces the serious impact and damage caused by the current type fault opening and reclosing to the power grid, the load and the equipment itself.

Current backup protection circuit 7 It is composed of non-intelligent components and has strong anti-interference ability, and is not interfered by extra-large current during faults, thus greatly improving the reliability of circuit protection.

The preamplifier 2 is further provided with a second microprocessor circuit 18 and a second electrical isolation device 19; the controller body 1 A first electrical isolation device 6 is disposed therein; the communication channel 53 is coupled to the first microprocessor circuit 3 via a first electrical isolation device 6; and the communication channel 53 is passed through a second electrical isolation device 19 It is connected to the second microprocessor circuit 18.

The front end device 2 further includes a front panel for a front panel and a rear panel for a front end; the front panel is provided with a liquid crystal touch screen on the front panel. , function pressure plate 21, human body infrared sensor 22, open and close operation button, remote and body operation switch, more than one indicator light and first temperature and humidity sensor 23 The front panel is provided with a second temperature and humidity sensor 54 on the rear panel; the liquid crystal touch screen 20, the function pressure plate 21, and the human body infrared sensor 22 The opening and closing operation button, the remote and main body operation changeover switch, the one or more indicator lights, the first temperature and humidity sensor 23, and the second temperature and humidity sensor 54 are respectively connected to the second microprocessor circuit 18.

The front end device 2 is further provided with a GPRS communication module 55 and an RF radio frequency communication module 56; the GPRS The communication module 55 and the RF radio communication module 56 are respectively connected to the second microcontroller circuit 18; the GPRS communication module 55 implements wireless remote management of the product, RF The RF Communications Module 56 is used in conjunction with a set of equipment with RF RF communication for product applications, eliminating many switching devices.

After the infrared human body infrared sensing sensor 22 senses that the human body is close, the second micro processing circuit 18 controls the liquid crystal touch screen. It is shown that after the human body leaves, the second microprocessor circuit 18 controls the liquid crystal touch screen 20 to be turned off. Overcome the reliability problem of the front end device 2 due to the short working life of the liquid crystal touch screen 20.

The front end 2 is generally mounted on the cabinet surface of the switchgear and is mounted on the front panel of the front panel. The first temperature and humidity sensor 23 For monitoring the environment outside the cabinet, the second temperature and humidity sensor 54 installed on the rear panel of the front-end unit 2 is used to monitor the environment inside the cabinet, and there are not many additional circuits, which reduces the number of complete sets of equipment when the product is applied. LCD touch screen 20 For information display and setting operation keyboard, function pressure plate 21 is used to set or cancel the important functions of the front end unit 2 intuitively and conveniently, avoiding errors and serious consequences.

Front end 2 The functional modules include an information display function module, a control function module, a statistical function module, and a diagnostic function module. The information display function module comprises: (1) display of electrical quantity information such as current, voltage, power, power factor, etc.; 2) Non-electrical quantity information such as temperature, humidity, switch position, energy storage position; (3) contact temperature display; (4) primary wiring diagram status display; (5) voltage, current, power, power factor curve display; ( 6) Protection information display and alarm information display;

The control function module comprises: (1) local and remote control; (2) hand truck advance and retreat control; (3) split and close control; (4) ) Door lock control: electromagnetic lock for control cabinet door; (5) heating, fan control: automatic temperature control in the cabinet according to the set temperature range;

The statistical function module includes: (1) ) Closing and opening event statistics: record minute and closing time, coil current, minute and closing time, minute and closing speed, minute and closing times; (2) ) Hand truck advance and retreat event statistics: record the operation time of the handcart, exercise time, exercise current, number of movements; (3) Ground knife segmentation, closing event statistics: record the ground knife action time, action time, motor current, motion speed, number of movements; (4) alarm event statistics: compared with the set limit value exceeds the alarm time and the current value; 5 Electricity consumption statistics: energy metering function, divided into peak, valley, and flat time measurement;

The diagnostic function module comprises: (1) circuit breaker characteristic diagnosis: determining whether the circuit breaker characteristic is normal; (2) Comprehensive automation system diagnosis: judge whether the circuit breaker controller function is normal; (3) complete device diagnosis: determine whether the measurement and control device in the cabinet is normal; (4) power distribution and load diagnosis: judge whether the circuit is normal; (5) ) Recording and closing events: record the current, voltage and moving contact stroke curve of the minute and closing;

The parameter setting functions include: (1) system parameter setting: setting system clock, communication protocol, rate, etc.; (2) Set parameter setting: set temperature and humidity alarm limit; (3) protection parameter setting: set overvoltage, undervoltage, quick disconnect, overcurrent, pressure plate and other parameters; (4) alarm parameter setting: set the mechanical characteristic alarm limit of the mechanism; (5 ) Interlocking operation parameter setting: setting the interlocking operation logic relationship of the circuit breaker.

As shown in FIG. 5, the infrared sensing detection circuit on the front end 2 of the present invention, the front end 2 Perceive the human body signal, open the liquid crystal display for the operator to use, and the output circuit 64 is turned off after the person leaves, reducing power consumption, saving power, protecting the liquid crystal display, and prolonging the service life. Human body infrared sensor 22 After receiving the infrared signal of the human body, it is converted into an electrical signal, filtered by the second filter circuit 61, and sent to the signal processing circuit 63 for processing. In order to improve the stability of the system, a feedback circuit 62 is added. Only the signal of a specific range of wavelengths is received, and finally a driving signal is outputted through the output circuit 64 to turn on the power of the liquid crystal touch screen 20.

As shown in Figures 6 and 7, the fiber optic communication circuit on the front end 2 includes the following components:

Optical fiber communication receiving circuit : fiber receiving head 65 via first filtering circuit 66 Filtering, eliminating visible light interference, the filtered signal is amplified by the first amplifying circuit 67, and then transmitted to the first signal conditioning circuit 68, the output end of the first signal conditioning circuit 68 and the first central processing unit communication port 69 connection; in order to improve the stability of communication, and improve the communication rate, the use of optical fiber as a communication medium has strong anti-interference ability and improves the anti-interference performance of the system.

Optical fiber communication transmitting circuit: : The second central processing unit communication port 70 transmits the signal to the second amplifying circuit 71 After amplification, the signal is transmitted to the second signal conditioning circuit 72, and the second signal conditioning circuit 72 transmits the conditioned signal to the driving circuit 73. The driving circuit 73 The voltage signal is converted into a current signal, and then the optical signal is converted into an optical signal through the optical fiber transmitting head 74 and transmitted through the optical fiber line.

The opening and closing operation component 10 includes a first opening and closing state contact 11 , a second opening and closing state contact 60 , and a tripping coil 12 . Closing coil 13 , switching power supply 42 , closing control outlet device 26 , opening control outlet device 27 , switching control drive circuit 31 , first anti - jump relay 28 and second anti - jump relay 29; the opening and closing control drive circuit 31, the opening control exit device 27, the second anti-jump relay 29, the first opening and closing state contact 11 , the opening and closing coil 12 and the switching power supply 42 The opening and closing circuit is formed; the opening and closing control drive circuit 31 is connected to the control end of the opening control outlet device 27; the opening control output device 27, the second anti-bounce relay 29, and the opening state contact 11 The opening and closing coil 12 and the opening and closing power source 42 are sequentially connected; the opening and closing control driving circuit 31, the closing control outlet device 26, the first anti-jump relay 28, and the second opening and closing state contact 60 The closing coil 13 and the opening and closing power source 42 constitute a closing circuit; the opening and closing control driving circuit 31 is connected to the control end of the closing control outlet device 26; the closing control outlet device 26 The first anti-jump relay 28, the closing state contact 60, the closing coil 13 and the opening and closing power source 42 are sequentially connected; the closing control outlet device 26 and the opening control outlet device 27 In order to shut down the power electronics. With the switchable power electronics, the switching time can be shortened and precisely controlled, reducing the switching time from 100ms to 40ms in the prior art. This reduces the opening time from 60ms to 15ms in the prior art, enabling accurate fault phase selection and phase reclosing.

The power electronic device is an IGBT tube or MOS a tube or a high power transistor or a turn-off thyristor; a first on-off detecting circuit 34, the first on-off detecting circuit 34 and the first opto-isolation device 32 are disposed on the closing circuit Connected to the opening circuit; a second on-off detecting circuit 35 is disposed on the opening circuit, and the second on-off detecting circuit 35 is connected to the second opto-isolation device 33; the first opto-isolation device 32 The outputs of the second opto-isolation device 33 are connected to the first microprocessor circuit 3, respectively.

The first microprocessor circuit 3 issues a trip command signal, and the trip command signal is controlled by the switch gate drive circuit 31. After receiving, the opening control gate device 27 is driven to control the opening coil 12 to open the circuit breaker, and the first switching state contact 11 sends the opening state signal to the first microprocessor circuit 3 The first microprocessor circuit 3 issues a closing command signal, and the closing and closing control drive circuit 31 receives the rear drive closing control outlet device 26, thereby controlling the closing coil 13 The circuit breaker is closed, and the second switching state contact 60 sends a closing state signal to the first microprocessor circuit 3.

The opening and closing operation component 10 further includes a brake coil 12 or a closing coil 13 for monitoring the opening and closing process. a current detecting circuit 30 of a current value; the current detecting circuit 30 is disposed between a junction point 57 of the opening and closing circuit and a switching power supply 42; the current detecting circuit 30 Connected to the first microprocessor circuit 3. The microprocessor circuit 3 monitors the on/off of the trip coil 12 and the closing coil 13, and the trip coil 12 during the opening process. Current and closing coils during closing process 13 The current is measured and diagnosed and uploaded. The circuit is simple and logically reasonable. The main circuit components of the circuit breaker are monitored online, and the fault is detected early and processed in time to avoid the occurrence of grid accidents.

When a short circuit fault occurs at the load terminal of the circuit breaker, the current transformer 24 passes the detected current signal through the current preprocessing circuit 25 The first microprocessor circuit 3 transmits the opening command signal to the opening and closing control circuit 4 to control the opening and closing coil of the opening and closing operation component 10 , the circuit breaker is opened.

The current backup protection circuit 7 includes a first potentiometer 36, a second potentiometer 37, and a third potentiometer 38. a first opto-isolation device 39, a second opto-isolation device 40, a third opto-isolation device 41, an operating power supply 59 and a current test connection 43; said first opto-isolation device 39 Connected to the current transformer 24 of the load terminal of the circuit breaker via a first potentiometer 36; the current optocoupler of the second optoelectronic isolation device 40 via the second potentiometer 37 and the load terminal of the circuit breaker 24 The opto-isolation device 41 is connected to the current transformer 24 of the load terminal of the circuit breaker via a third potentiometer 38; the first potentiometer 36, the second potentiometer 37, and the third potentiometer 38 Connected to the current test connector 43 respectively; the output terminals of the first optoelectronic isolation device 39, the second optoelectronic isolation device 40, and the third optoelectronic isolation device 41 are respectively connected to the operating power source 59. The first microprocessor circuit 3 is connected to the switching control circuit 4.

An electromagnetic shielding device and an electrical connection line are disposed outside the controller body 1; the electromagnetic shielding device includes a surrounding panel 50 Front panel for electromagnetic shielding device 44, rear panel 45 for electromagnetic shielding device; front panel 44 for electromagnetic shielding device and rear panel 45 for electromagnetic shielding device and surrounding panel 50 The surrounding panel 45 for the electromagnetic shielding device and the rear panel 45 for the electromagnetic shielding device are double-layered or double-layered metal plates; the electromagnetic shielding device is provided with an anti-vibration connecting member 48 and circuit board;

The circuit board is a motherboard 49 and a board 58; the motherboard 49 and the board 58 are provided with a connector 51; the board 58 is matched with the motherboard 49 through the connector 51; the electromagnetic shielding device is provided with a cable hole on the rear panel 45, and the electrical connection cable is directly connected to the motherboard 49 through the cable hole.

The metal plate is a double layer, the inner layer is an aluminum plate 47, and the outer layer is an iron plate 46; the thickness of the aluminum plate 47 is not less than 3 mm. The outer layer is an iron plate 46, and the thickness of the iron plate 46 is not less than 1 mm; the iron plate 46 has a strong shielding effect on the magnetic field, and the aluminum plate 47 It has a strong shielding effect on electric field interference. The two have a certain thickness and combined, so that the controller body 1 has good electromagnetic compatibility, ensuring reliable operation in the case of load short circuit.

A capacitor is disposed in the switching power source 42; the capacitor is used for energy storage, thereby reducing the capacity of the external power source 15 and improving the working power circuit The stability of 9 makes the control of the closing time precise and precise.

The electrical connection line is a cable 52 having a metal shielding layer, and the shielding layer of the cable 52 is via the motherboard 49. The ground plane is connected to the electromagnetic shielding device. The metal shielded cable 52 is used to prevent the introduction of interference signals and improve electromagnetic compatibility; the overall structure of the present invention is simple, and installation, debugging, and maintenance are also convenient.

A current backup protection circuit for an integrated high voltage AC circuit breaker controller of the present invention, the current backup protection circuit 7 comprising a first potentiometer 36 a second potentiometer 37, a third potentiometer 38, a first opto-isolator 39, a second opto-isolator 40, a third opto-isolator 41, an operating power supply 59, and a current test connector 43 The first opto-isolation device 39 is connected to the current transformer 24 of the load terminal of the circuit breaker via a first potentiometer 36; the second opto-isolation device 40 is via a second potentiometer 37 Connected to the current transformer 24 of the load terminal of the circuit breaker; the opto-isolation device 41 is connected to the current transformer 24 of the load terminal of the circuit breaker via a third potentiometer 38; the first potentiometer 36 The second potentiometer 37 and the third potentiometer 38 are respectively connected to the current test connecting member 43; the working power source 59, the first microprocessor circuit 3 and the opening and closing control circuit 4 The outputs of the first optoelectronic isolation device 39, the second optoelectronic isolation device 40, and the third optoelectronic isolation device 41 are respectively connected.

The A pole of the first opto-isolation device 39 is connected to the current transformer of the load terminal of the switching operation component 10 via the first potentiometer 36 The A terminal of 24 is connected, the K pole of the first opto-isolation device 39 is connected to the N terminal of the current transformer 24; A of the second optoelectronic isolation device 40 The pole is connected to the B terminal of the load terminal current transformer 24 of the circuit breaker via a second potentiometer 37, the K pole of the second optoelectronic isolation device 40 and the N of the current transformer 24 The terminal of the third photoelectric isolation device 41 is connected to the C terminal of the load terminal current transformer 24 of the circuit breaker via the third potentiometer 38, and the K of the third photoelectric isolation device 41 The pole is connected to the N terminal of the current transformer 24.

(1) the current transformer 24 detects a current signal;

(2) the current signal detected by the current transformer 24 is output to the current backup protection circuit 7;

(3) The current backup protection circuit 7 when the detected current signal exceeds the protection start current value of the current backup protection circuit 7 Output the signal to the switching control circuit 4;

(4) The opening and closing control circuit 4 controls the opening and closing coils in the opening and closing operation component 10 in the circuit breaker 12 , the circuit breaker is opened.

(1) When single-phase grounding or two-phase short-circuiting, current pre-processor circuit 25, voltage phase detecting circuit 17 Detecting a signal of a short-circuited phase and a faulty voltage zero-crossing point;

(2) the shorted phase signal and the faulty voltage zero crossing signal are transmitted to the first microprocessor circuit 3, the first microprocessor circuit 3 Analysis of the short-circuited phase signal and the faulty voltage zero-crossing signal to determine the phase difference of the short circuit occurring and the zero-crossing point of the fault voltage;

(3) The stroke detecting circuit 5 detects the opening and closing time of the circuit breaker, and obtains a closing time signal;

(4) the opening and closing time signal is transmitted to the first microprocessor circuit 3, and the first microprocessor circuit (3) is divided and closed. 10 Control so that the circuit breaker switch closing point is at the zero-crossing point of the short-circuit fault phase AC voltage, and the phase selection opening operation and the phase selection reclosing operation are performed.

Example 2

The difference between this embodiment and the first embodiment is that the closing circuit passes the electrical connection line and the first on-off detecting circuit 34 at point A2. It is connected to the first opto-isolation device 32.

The trip circuit is connected to the second on-off detecting circuit 35 and the second opto-isolation device 33 through an electrical connection line at point B2.

The power electronic device is a high power transistor or a turn-off thyristor or a MOS transistor.

Example 3

The difference between this embodiment and the first embodiment is that the closing circuit passes the electrical connection line and the first on-off detecting circuit 34 at point A2. It is connected to the first opto-isolation device 32. The trip circuit passes through the electrical connection line and the second on-off detection circuit 35 and the second opto-isolation device 33 at point B1. Connected. The power electronic device is a turn-off thyristor or a MOS transistor.

Example 4

The difference between this embodiment and the first embodiment is that the closing circuit passes the electrical connection line and the first on-off detecting circuit 34 at point A1. It is connected to the first opto-isolation device 32. The trip circuit passes through the electrical connection line and the second on-off detection circuit 35 and the second opto-isolation device 33 at point B2. Connected. The power electronic device is a high power transistor.

The basic principles, main features, and advantages of the present invention are shown and described above. Technology in the industry

It is to be understood that the invention is not limited to the embodiments described above, and that the invention is described in the foregoing description and the description of the invention, and the invention may be variously modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the appended claims, the description and its equivalents

Claims

An integrated high-voltage AC circuit breaker controller comprising a controller body (1), a pre-amplifier (2) and a stroke detecting circuit (5), characterized in that: the controller body ( 1) comprising a first microprocessor circuit (3) and a switching control circuit (4); the controller body (1) is electrically connected to its external power source (15), a distribution voltage transformer (16) The current transformer (24) of the circuit breaker load and the opening and closing operation component (10) disposed in the circuit breaker are connected; the controller body (1) passes through the communication channel (53) and the front end (2) Connected; the stroke detecting circuit (5) is connected to the first microprocessor circuit (3); the first microprocessor circuit (3) is connected to the switching control circuit (4); Controller body (1 ) is connected to the opening and closing operation component (10) of the circuit breaker; the controller body (1) issues a tripping command signal or a closing command signal to activate the opening and closing operation component (10) ) Control the opening or closing operation of the circuit breaker.

2. The integrated high voltage AC circuit breaker controller according to claim 1, wherein: said controller body (1) It also includes a three-phase AC voltage phase detection circuit (17), a current pre-processing circuit (25), a current backup protection circuit (7), a working power supply circuit (9), and a standby working power supply circuit (8). And OR gate property circuit (14); said three-phase AC voltage phase detection circuit (17), current preprocessor circuit (25) and current backup protection circuit (7) Connected to the first microprocessor circuit (3) via electrical connection lines; the current pre-processing circuit (25) passes through the first switching circuit (3) through the switching control circuit (4) Connecting with the opening and closing operation component (10); the current backup protection circuit (7) is connected to the opening and closing operation component (10) through a switching control circuit (4); the external Power supply 15) connected to the working power circuit (9); the distribution voltage transformer (16) is connected to the standby working power circuit (8); the working power circuit (9) and the standby working power circuit (8) Connected to the microprocessor circuit (3) via an OR gate circuit (14); the input of the three-phase AC voltage phase detection circuit (17) and an external distribution voltage transformer (16) Connected, the output is connected to the microprocessor circuit (3); the current pre-processing circuit (25) and the current backup protection circuit (7) are respectively connected to the current transformer (24) ) connected.

3. The integrated high voltage AC circuit breaker controller according to claim 1, wherein the preamplifier (2) is further provided with a second microprocessor circuit ( 18) and a second electrical isolation device (19); the controller body (1) is provided with a first electrical isolation device (6); the communication channel (53) is passed through the first electrical isolation device (6) ) is connected to the first microprocessor circuit ( 3 ); the communication channel ( 53 ) is connected to the second microprocessor circuit ( 18 ) via the second electrical isolation device ( 19 ).

4. The integrated high voltage AC circuit breaker controller according to claim 3, wherein the preamplifier (2) It also includes a front panel for the front end and a rear panel for the front end; the front panel is provided with a liquid crystal touch screen (20), a function pressure plate (21), and a human body infrared sensor (22). ), a closing and closing operation button, a remote and main body operation changeover switch, one or more indicator lights and a first temperature and humidity sensor (23); the front end device is provided with a second temperature and humidity sensor on the rear panel (54) The liquid crystal touch screen (20), the function pressure plate (21), the human body infrared sensor (22) ), a closing and closing operation button, a remote and main body operation changeover switch, one or more indicator lights, a first temperature and humidity sensor (23), a second temperature and humidity sensor (54) and a second microprocessor circuit (18) ) connected.

5. The integrated high voltage AC circuit breaker controller according to claim 4, wherein the front end (2) is further provided with GPRS a communication module (55) and an RF radio communication module (56); the GPRS communication module (55) and the RF radio communication module (56) and the second microcontroller circuit (18) The infrared human body infrared sensing sensor (22) senses the proximity of the human body, and the second micro processing circuit (18) controls the liquid crystal touch screen (20) to display, after the human body leaves, the second microprocessor circuit ( 18) Control the LCD touch screen (20) to turn off the delay.

6. The integrated high voltage AC circuit breaker controller according to claim 1, wherein: said opening and closing operation component (10) ) includes a first opening and closing state contact (11), a second opening and closing state contact (60), a trip coil (12), a closing coil (13), a switching power supply (42), and a closing control outlet Device 26), opening control outlet device (27), opening and closing control driving circuit (31), first anti-jumping relay (28) and second anti-jumping relay (29); said switching control driving circuit (31) ), opening control outlet device ( 27 ), second anti-jump relay ( 29 ), first opening and closing state contact ( 11 ), opening coil ( 12 ) and switching power supply ( 42 ) The switch control circuit (31) is connected to the control end of the trip control outlet device (27); the trip control output device (27) and the second anti-jump relay (29) ), the opening state contact (11), the opening coil (12) and the opening and closing power source (42) are sequentially connected; the opening and closing control driving circuit (31) and the closing control outlet device (26) The first anti-jump relay (28), the second opening and closing state contact (60), the closing coil (13) and the opening and closing power source (42) constitute a closing circuit; the opening and closing control driving circuit ( 31 ) is connected to the control end of the closing control outlet device ( 26 ); the closing control outlet device ( 26 ), the first anti-jump relay ( 28 ), the closing state contact ( 60 ), and the closing coil ( 13 ) And the closing power supply (42) is connected in turn; the closing control outlet device (26) and the opening control outlet device (27) are power electronic devices that can be turned off.

7. The integrated high voltage AC circuit breaker controller according to claim 6, wherein the power electronic device is an IGBT tube or a MOS a tube or a high power transistor or a turn-off thyristor; the closing circuit is provided with a first on-off detection circuit (34), the first on-off detection circuit (34) and the first opto-isolation device (32) Connected to the opening circuit; a second on-off detecting circuit (35) is disposed on the opening circuit, and the second on-off detecting circuit (35) is connected to the second opto-isolation device (33); Isolation device ( 32 And the output of the second optoelectronic isolation device (33) is respectively connected to the first microprocessor circuit (3).

8. The integrated high voltage AC circuit breaker controller according to claim 3, wherein: said first microprocessor circuit (3) And issuing a trip command signal, the trip command signal being received by the switch control drive circuit (31), driving the trip control exit device (27), thereby controlling the trip coil (12) Opening the circuit breaker, the first switching state contact (11) sends the opening state signal to the first microprocessor circuit (3); the first microprocessor circuit (3) Sending a closing command signal, which is driven by the opening and closing control drive circuit (31) to drive the closing control outlet device (26), thereby controlling the closing coil (13) The circuit breaker is closed, and the second switching state contact (60) sends the closing state signal to the first microprocessor circuit (3).

9. The integrated high voltage AC circuit breaker controller according to claim 6, wherein the opening and closing operation component (10) a current detecting circuit (30) for monitoring the current value of the opening coil (12) or the closing coil (13) during the opening and closing process; the current detecting circuit (30) Provided between the junction point (57) of the opening and closing circuit and the switching power supply (42); the current detecting circuit (30) and the first microprocessor circuit (3) ) connected.

10. The integrated high voltage AC circuit breaker controller according to claim 2, wherein when a short circuit fault occurs at the load end of the circuit breaker, the current transformer ( 24) transmitting the detected current signal to the first microprocessor circuit (3) via the current pre-processing circuit (25), the first microprocessor circuit (3) transmitting the opening command signal to the switching control Circuit (4) Control the opening coil (12) of the opening and closing operation component (10) to open the circuit breaker.

11. The integrated high voltage AC circuit breaker controller according to claim 2, wherein said current backup protection circuit (7) comprises a first potentiometer (36), second potentiometer (37), third potentiometer (38), first opto-isolation device (39), second opto-isolation device (40), third opto-isolation device (41) a working power source (59) and a current test connector (43); the first opto-isolation device (39) via a first potentiometer (36) and a current transformer (24) 5 at the load end of the circuit breaker The second opto-isolation device (40) is connected to the current transformer (24) of the load terminal of the circuit breaker via a second potentiometer (37); the opto-isolation device (41) Connected to a current transformer (24) at the load end of the circuit breaker via a third potentiometer (38); the first potentiometer (36), the second potentiometer (37), and the third potentiometer (38) Connected to the current test connection (43) respectively; the output ends of the first opto-isolation device (39), the second opto-isolation device (40), and the third opto-isolation device (41) are respectively connected to the working power supply ( 59) The first microprocessor circuit (3) is connected to the switching control circuit (4).

12. The integrated high voltage AC circuit breaker controller according to claim 1, wherein: said controller body (1) An electromagnetic shielding device and an electric connecting wire are disposed outside, and the electromagnetic shielding device includes a surrounding panel (50), a front panel for the electromagnetic shielding device (44), and a rear panel for the electromagnetic shielding device (45) The electromagnetic shielding device front panel (44) and the electromagnetic shielding device rear panel (45) are respectively connected to the surrounding panel (50) through a fixing member; the surrounding panel (50) The front panel (44) for electromagnetic shielding device and the rear panel (45) for electromagnetic shielding device are double-layer or double-layer metal plates; the electromagnetic shielding device is provided with anti-vibration connecting members (48) And a circuit board; the circuit board is a motherboard (49) and a board (58); the motherboard (49) and the board (58) are provided with a connector (51); the board (58) Via connector (51) is adapted to the motherboard (49); the electromagnetic shielding device is provided with a cable hole on the rear panel (45), and the electrical connection cable passes through the cable hole directly to the motherboard (49) Connected.

13. The integrated high voltage AC circuit breaker controller according to claim 12, wherein the metal plate is a double layer and the inner layer is an aluminum plate (47). The outer layer is an iron plate (46); the switching power source (42) is provided with a capacitor; the electrical connection line is a cable (52) having a metal shielding layer, and the cable (52) Shield through mother board (49) The ground plane is connected to the electromagnetic shielding device.

14. A current backup protection circuit for an integrated high voltage AC circuit breaker controller, characterized in that said current backup protection circuit (7) comprises a first potentiometer (36) , second potentiometer (37), third potentiometer (38), first opto-isolator (39), second opto-isolator (40), third opto-isolator (41), working power ( 59 And a current test connection (43); the first opto-isolation device (39) via a first potentiometer (36) and a current transformer at the load end of the circuit breaker (24) Connected; the second opto-isolation device (40) is connected to a current transformer (24) at the load end of the circuit breaker via a second potentiometer (37); the opto-isolation device (41) Connected to a current transformer (24) at the load end of the circuit breaker via a third potentiometer (38); the first potentiometer (36), the second potentiometer (37), and the third potentiometer (38) Connected to the current test connection (43); the working power supply (59), the first microprocessor circuit (3) and the switching control circuit (4) and the first photoelectric isolation device (39) The output ends of the second opto-isolation device (40) and the third opto-isolation device (41) are connected.

15. The current backup protection circuit according to claim 14, wherein: A of said first opto-isolation device (39) The pole is connected to the A terminal of the current transformer (24) of the load terminal of the opening and closing operation component (10) via a first potentiometer (36), K of the first photoelectric isolation device (39) a pole connected to the N terminal of the current transformer (24); an A pole of the second optoelectronic isolation device (40) via a second potentiometer (37) and a load current transformer of the circuit breaker (24) The B terminal is connected, the K pole of the second opto-isolation device (40) is connected to the N terminal of the current transformer (24); the A pole of the third optoelectronic isolation device (41) is via the third potential Device (38) connected to the C terminal of the load terminal current transformer (24) of the circuit breaker, the K pole of the third optoelectronic isolation device (41) and the N of the current transformer (24) The ends are connected.

16. A method of operating a current backup protection circuit, comprising the steps of: (1) said current transformer (24) ) detecting a current signal;

(2) the current signal detected by the current transformer (24) is output to the current backup protection circuit (7);

(3) The current backup protection circuit (7) when the detected current signal exceeds the protection start current value of the current backup protection circuit (7) Output the signal to the switching control circuit (4);

(4) The opening and closing control circuit (4) controls the opening and closing coil (12) in the opening and closing operation component (10) in the circuit breaker , the circuit breaker is opened.

17. A method of phase selection opening and phase selection reclosing, comprising the steps of:

(1) When single-phase or two-phase short-circuit, current pre-processor circuit (25), voltage phase detection circuit (17) Detecting a signal of a short-circuited phase and a faulty voltage zero-crossing point;

(2) the short-circuited phase signal and the faulty voltage zero-crossing signal are transmitted to the first microprocessor circuit (3),

The first microprocessor circuit (3) The short-circuited phase signal and the faulty voltage zero-crossing signal are analyzed to determine the phase difference of the short circuit occurring and the zero-crossing point of the fault voltage;

(3) The stroke detecting circuit (5) detects the opening and closing time of the circuit breaker, and obtains a closing time signal;

(4) The opening and closing time signal is transmitted to the first microprocessor circuit (3), and the first microprocessor circuit (3) is divided and closed to the operating component (10) The control is performed so that the circuit breaker switch closing point is at the zero-crossing point of the short-circuit fault phase AC voltage, and the phase selection opening operation and the phase selection reclosing operation are performed.