CN203645320U

CN203645320U - Active voltage-regulating type arc extinction voltage-limiting protection device used for low-current grounding system

Info

Publication number: CN203645320U
Application number: CN201320823668.7U
Authority: CN
Inventors: 章承民; 梁天山; 刘水龙; 秦邦振; 张银宝; 苏建民; 曹君芳; 李宏斌; 张建军; 卢莉; 孙世亮; 陈金山
Original assignee: HEBEI WEIZHENG ELECTRIC POWER TECHNOLOGY Co Ltd
Current assignee: HEBEI WEIZHENG ELECTRIC POWER TECHNOLOGY Co Ltd
Priority date: 2013-12-10
Filing date: 2013-12-10
Publication date: 2014-06-11
Anticipated expiration: 2023-12-10

Abstract

Provided is an active voltage-regulating arc extinction voltage-limiting protection device used for a low-current grounding system. The active voltage-regulating arc extinction voltage-limiting protection device comprises an intelligent controller and an active voltage-regulating assembly, the intelligent controller is used for monitoring the phase voltage and the zero-sequence voltage of a power supply system in real time, and when single-phase grounding faults happen to the power supply system, the conduction and the conduction rate of the active voltage-regulating assembly are controlled, and a grounding fault phase of a cable of a superior wire-outlet cabinet is connected with a system ground via the active voltage-regulating assembly; the active voltage-regulating assembly is used for regulating the fault phase-to-ground voltage, the fault phase voltage is lower than the insulation withstand voltage of fault points, and the ground discharging of the fault points is eliminated so that the damage of arc overvoltage to the operation of the power supply system is prevented, and when the insulation of the fault points is recovered, the protection state automatically exits. The active voltage-regulating arc extinction voltage-limiting protection device is advantageous in that when the power supply system operates regularly, the displacement voltage of a neutral point in the system is not amplified; when arc extinction and voltage limiting are performed for a fault phase, the normal phase voltage does not always rise to the level of a line voltage; and after a fault line exits, the protection state automatically exists.

Description

For the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage of small current neutral grounding system

Technical field

The utility model relates to a kind of extinguishing arc protective arrangement for limiting output voltage, particularly a kind of active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system.

Background technology

At present, in China, the 3-60kV electric power system that industrial and mining enterprises are generally used generally adopts small current neutral grounding system.And the major way producing for the prevention arc overvoltage of small current neutral grounding system has two kinds, i.e. arc suppression coil and arc extinction cabinet; Wherein the range of application of arc suppression coil is the most extensive, its action principle is: when after electrical network generation single phase ground fault, for system provides certain inductive current, the capacitance current of bucking-out system, earth current is reduced, also while making fault phase earth point arc extinction, the recovery voltage Speed Reduction at electric arc two ends, thus reach the object of extinguishing arc pressure limiting; The operation principle of arc extinction cabinet is: when after electrical network generation single phase ground fault, by directly short circuit over the ground of fault phase, make fault point voltage to earth vanishing, thereby eliminate arc discharge.But all there is larger defect in the protected mode that above-mentioned two kinds of prevention arc overvoltages produce.

The parameter of arc suppression coil designs according to 50Hz power frequency, power frequency capacitance current under normal circumstances can bucking-out system, but in the time of system generation arc discharge, the frequency of discharging current is very high, conventionally arrive several thousand Hz at hundreds of, and arc suppression coil is very high to the impedance of high-frequency discharge electric current, compensating action is extremely small, therefore, and in actual applications, once there is arc grounding fault, the arc extinguishing effect of arc suppression coil is very limited; In addition, the operation of arc suppression coil is not allow to be operated in full compensating coefficient, therefore, and system when operation, the power frequency capacitance current that arc suppression coil can not full remuneration system; Moreover; the characteristic having due to arc suppression coil itself; when after system installing arc suppression coil; inevitably amplify system neutral displacement voltage; when system parameter variations; may produce " illusory ground connection " phenomenon; cause the misoperation of other protective device in system; bring certain hidden danger to system safety operation; and; due to the compensating action of arc suppression coil to power frequency capacitance current, the capacitance current that Small Electric Current Earthing And Routing Device can be detected becomes very little, and route selection accuracy rate reduces greatly.

Arc extinction cabinet is in the time of system generation arc grounding fault, by directly short circuit over the ground of fault phase, arc grounding is changed into bus bar side metal ground connection, although eliminated arc overvoltage, but another two phase-to-ground voltages are lifted to line voltage regularly simultaneously, make normal phase voltage to earth for a long time in higher level, have equally potential safety hazard; In addition, arc extinction cabinet is converted into busbar grounding by fault after action, and arc extinction cabinet often cannot automatically exit after action, system long-term work is in abnormal condition, make correctly route selection of Small Electric Current Earthing And Routing Device, correct judgement and troubleshooting to faulty line cause very large difficulty.

Utility model content

The purpose of this utility model is: design a kind of active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system; in the time of electric power system generation single phase ground fault; this extinguishing arc protective arrangement for limiting output voltage can detection failure point insulating withstand voltage; fault phase limiting voltage is insulated below withstand voltage in fault point; thereby avoid the generation of arc overvoltage, reach the object of extinguishing arc pressure limiting.

The purpose of this utility model can realize by following technical proposals:

This is for the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage of small current neutral grounding system, it is characterized in that: comprise intelligent controller and active pressure regulation assembly, intelligent controller is for each phase voltage and the residual voltage of Real-Time Monitoring electric power system, in the time of electric power system generation single phase ground fault, control conducting and the on-state rate of active pressure regulation assembly, and by earth fault in higher level's outgoing line cabinet cable by active pressure regulation assembly be systematically connected; Active pressure regulation assembly is used for regulating fault phase voltage to earth; make fault phase voltage lower than the fault point withstand voltage that insulate, eliminate fault point and discharge over the ground, thereby avoid arc overvoltage electric power system to be moved to the harm causing; and after the insulation recovery of fault point, automatically exit guard mode.

This extinguishing arc protective arrangement for limiting output voltage of the utility model also comprises three vacuum contactors, described active pressure regulation assembly has one group, the stationary contact of the main contacts of three vacuum contactors respectively with the A of higher level's outgoing line cabinet cable, B, C three-phase is connected, after the movable contact head end of the main contacts of three vacuum contactors links together, be connected with the end of incoming cables of described one group of active pressure regulation assembly, the leading-out terminal of active pressure regulation assembly be systematically connected, the coil of three contactors and active pressure regulation assembly are all electrically connected with intelligent controller, intelligent controller is connected in the three-phase four-wire system AC power of electric power system, the three-phase voltage U A of Real-Time Monitoring electric power system, UB and UC and residual voltage U0.

Active pressure regulation assembly described in the utility model has three groups, the end of incoming cables of three groups of active pressure regulation assemblies is connected with A, B, the C three-phase of higher level's outgoing line cabinet cable respectively, after the leading-out terminal of three groups of active pressure regulation assemblies links together, with be systematically connected, three groups of active pressure regulation assemblies are all electrically connected with intelligent controller, intelligent controller is connected in the three-phase four-wire system AC power of electric power system, three-phase voltage U A, the UB of Real-Time Monitoring electric power system and UC and residual voltage U0.

Active pressure regulation assembly described in the utility model is by some great power bidirectional controllable silicons, some silicon controlled rectifier protecting unit and trigger control unit A form, between every great power bidirectional silicon controlled two anodes, be parallel with a silicon controlled rectifier protecting unit, after some great power bidirectional controllable silicons are connected by its some antianodes, first great power bidirectional silicon controlled second plate is the end of incoming cables of active pressure regulation assembly, last part great power bidirectional silicon controlled first anode is the leading-out terminal of active pressure regulation assembly, with be systematically connected, the control of some great power bidirectional silicon controlleds is extremely all electrically connected with trigger control unit A, trigger control unit A is electrically connected with intelligent controller.

Active pressure regulation assembly described in the utility model is by some great power bidirectional IGBT elements, IGBT element protection unit and trigger control unit B form, every great power bidirectional IGBT element is made up of two high-power IGBT elements, wherein the collector and emitter of a high-power IGBT element is connected with the emitter and collector of another part high-power IGBT element respectively, between two common ports of every great power bidirectional IGBT element, be parallel with an IGBT element protection unit, some great power bidirectional IGBT elements are some to after common port series connection by it, the upper common port of first great power bidirectional IGBT element is the end of incoming cables of active pressure regulation assembly, the lower common port of last part great power bidirectional IGBT element is the leading-out terminal of active pressure regulation assembly, with be systematically connected, two gate terminal of every great power bidirectional IGBT element are all electrically connected with trigger control unit B, trigger control unit B is electrically connected with intelligent controller.

Intelligent controller described in the utility model is by power circuit, input circuit, central processing unit circuit, show and function circuit, output circuit and accessory circuit form, in described power circuit, there is terminals P 1, Switching Power Supply DY1, 3.3V chip operation power circuit and AD sampling reference power source circuit, wherein, in 3.3V chip operation power circuit, there is low-dropout regulator U2, resistance R 1, there are polar capacitor C1 and C2, capacitor C 5 and C6 and light-emitting diode D1, the model of its low-dropout regulator U2 is LM1117MP-3.3, in AD sampling reference power source circuit, there is low-dropout regulator U3, resistance R 2 and R3, there are polar capacitor C3 and C4 and capacitor C 7, C8 and C9, the model of its low-dropout regulator U3 is LM1117MP-ADJ, in input circuit, there are terminals P 2, voltage transformer pt 201～PT204, resistance R 201～R208 and capacitor C 201～C204, in central processing unit circuit, have microcontroller U1, crystal oscillator JT1, resistance R 17～R19, capacitor C 18 and C19 and light-emitting diode D4, the model of its microcontroller U1 is STM32F103ZE, in demonstration and function circuit, there is liquid crystal display YJ1, resistance R 601～R607 and the light-emitting diode D601～D607 with touch-screen, in output circuit, have the chip of driving U7, electromagnetic relay JQ301～JQ304, diode D301～D304, isolating transmitter DC1 and terminals P 3, it drives the model of chip U7 is ULN2004A, and the model of isolating transmitter DC1 is TS160D/S-3.3, in accessory circuit, there are transceiver U4, transceiver U6, power supply monitoring and hardware watchdog chip U5, resistance R 20, R22 and R41, capacitor C 10～C15, have polar capacitor C16 and C17 and terminals P 4,

Its circuit connecting relation is: in power circuit, Switching Power Supply DY1 provides working power for described intelligent controller complete machine, its input splicing ear P1, terminals P 1 connects transformer station's alternating current 220V control power supply, the output end of Switching Power Supply DY1, 5V-end and 12V-hold ground connection after mutual short circuit, 5V+ end output+5V DC power supply VCC, 12V+ end output+12V DC power supply, in 3.3V chip operation power circuit, the 3rd pin connection+5V DC power supply VCC of low-dropout regulator U2, be connected with the positive pole of polar capacitor C1 and one end of capacitor C 5 simultaneously, ground connection after having the negative pole of polar capacitor C1 to be connected with the other end of capacitor C 5, the 1st pin ground connection of low-dropout regulator U2, and be connected with the negative pole of polar capacitor C2 and one end of capacitor C 6 simultaneously, there are the positive pole of polar capacitor C2 and the other end of capacitor C 6 to be connected to the 2nd pin of low-dropout regulator U2, the 2nd pin output 3.3V chip operation power supply of low-dropout regulator U2, one end of resistance R 1 is connected with the positive pole of polar capacitor C2, the positive pole of the other end connecting luminous diode D1 of resistance R 1, the negative pole of light-emitting diode D1 is connected with the negative pole that has polar capacitor C2, in AD sampling reference power source circuit, the 3rd pin connection+5V DC power supply VCC of low-dropout regulator U3, be connected with the positive pole of polar capacitor C3 and one end of capacitor C 7 simultaneously, ground connection after having the negative pole of polar capacitor C3 to be connected with the other end of capacitor C 7, one end of the 1st pin contact resistance R2 of low-dropout regulator U3, one end of one end of resistance R 3 and capacitor C 8, ground connection after the other end of resistance R 2 is connected with the other end of capacitor C 8, and be connected with the negative pole of polar capacitor C4 and one end of capacitor C 9 simultaneously, the other end of contact resistance R3 after having the positive pole of polar capacitor C4 to be connected with the other end of capacitor C 9, the other end of resistance R 3 is connected to the 2nd pin of low-dropout regulator U3, the 2nd pin output 1.65V AD sampling reference power source of low-dropout regulator U3, in input circuit, a winding of voltage transformer pt 201 just, negative pole end is connected respectively to U0L end and the U0N end of terminals P 2, the secondary winding of voltage transformer pt 201 just, one end of negative pole end difference contact resistance R201 and one end of resistance R 202, one end of resistance R 202 connects one end of capacitor C 201, the other end ground connection of capacitor C 201, the other end of resistance R 201 is drawn signal U0, and be connected with the other end of resistance R 202, a winding of voltage transformer pt 202 just, negative pole end is connected respectively to UAL end and the UAN end of terminals P 2, the secondary winding of voltage transformer pt 202 just, one end of negative pole end difference contact resistance R203 and one end of resistance R 204, one end of resistance R 204 connects one end of capacitor C 202, the other end ground connection of capacitor C 202, the other end of resistance R 203 is drawn signal UA, and be connected with the other end of resistance R 204, a winding of voltage transformer pt 203 just, negative pole end is connected respectively to UBL end and the UBN end of terminals P 2, the secondary winding of voltage transformer pt 203 just, one end of negative pole end difference contact resistance R205 and one end of resistance R 206, one end of resistance R 206 connects one end of capacitor C 203, the other end ground connection of capacitor C 203, the other end of resistance R 205 is drawn signal UB, and be connected with the other end of resistance R 206, a winding of voltage transformer pt 204 just, negative pole end is connected respectively to UCL end and the UCN end of terminals P 2, the secondary winding of voltage transformer pt 204 just, one end of negative pole end difference contact resistance R207 and one end of resistance R 208, one end of resistance R 208 connects one end of capacitor C 204, the other end ground connection of capacitor C 204, the other end of resistance R 207 is drawn signal UC, and be connected with the other end of resistance R 208, the U0L end of terminals P 2, UAL end, UBL end is connected the three-phase four-wire system AC power of electric power system with UCL end, in central processing unit circuit, the 32nd pin of microcontroller U1 connects 3.3V chip operation power supply, the 17th of microcontroller U1, the 33rd, the 39th, the 52nd, the 62nd, the 72nd, the 84th, the 95th, the 108th, the 121st, after the mutual short circuit of the 131st and the 144th pin, connect 3.3V chip operation power supply, 28 pins of microcontroller U1 connect 1.65V AD sampling reference power source, the 29th pin ground connection of microcontroller U1, the 16th of microcontroller U1, the 30th, the 31st, the 38th, the 51st, the 61st, the 71st, the 83rd, the 94th, the 107th, the 120th, ground connection after the mutual short circuit of the 130th and the 143rd pin, after crystal oscillator JT1 is in parallel with resistance R 18, its one end connects one end of capacitor C 19, and be connected to the 24th pin of microcontroller U1 simultaneously, its other end connects one end of capacitor C 18, and be connected to the 23rd pin of microcontroller U1 simultaneously, the other end of capacitor C 18 is connected with the other end of capacitor C 19, and be connected to the 30th pin of microcontroller U1 simultaneously, one end of resistance R 17 is connected to the 18th pin of microcontroller U1, the other end connecting luminous diode D4 positive pole of resistance R 17, light-emitting diode D4 minus earth, the two ends of resistance R 19 are connected respectively to the 16th and the 138th pin of microcontroller U1, in demonstration and function circuit, with the 1st pin connection+5V DC power supply of the liquid crystal display YJ1 of touch-screen, with the 8th pin ground connection of the liquid crystal display YJ1 of touch-screen, one end of resistance R 601～R607 is the positive pole of connecting luminous diode D601～D607 respectively, the negative pole of light-emitting diode D601～D607 interconnects, the other end connection+5V DC power supply VCC of resistance R 607, in output circuit, drive the 9th pin connection+12V DC power supply of chip U7, drive the 8th pin ground connection of chip U7, one end all connect+12V DC power supply of electromagnetic relay JQ301～JQ304 coil, and connect respectively the negative pole of diode D301～D304, the other end of electromagnetic relay JQ301～JQ304 coil is connected respectively to 16th～13 pins that drive chip U7, and connect respectively the positive pole of diode D301～D304, one end of electromagnetic relay JQ301～JQ304 normally opened contact is connected respectively to the HZA end of terminals P 3, HZB end, HZC end and BJ1 end, the other end of electromagnetic relay JQ301～JQ303 normally opened contact is all connected to the COM end of terminals P 3, the other end of electromagnetic relay JQ304 normally opened contact is connected to the BJ2 end of terminals P 3, the 7th pin connection+5V DC power supply VCC of isolating transmitter DC1, the equal ground connection of the 4th and the 8th pin of isolating transmitter DC1, the the 1st and the 2nd pin of isolating transmitter DC1 is connected respectively to OUT-end and the OUT+ end of terminals P 3, in accessory circuit, the 8th pin of transceiver U4, the 2nd pin of the 16th pin of transceiver U6 and power supply monitoring and hardware watchdog chip U5 is all connected 3.3V chip operation power supply, the 5th pin of transceiver U4, the equal ground connection of the 3rd pin of the 15th pin of transceiver U6 and power supply monitoring and hardware watchdog chip U5, one end of the 6th pin contact resistance R20 of transceiver U4, the other end of resistance R 20 connects the 7th pin of transceiver U4, one end of capacitor C 10 is connected with the positive pole of polar capacitor C16, and connect 3.3V chip operation power supply simultaneously, after the other end of capacitor C 10 is connected with the negative pole that has polar capacitor C16, be connected to the 5th pin of transceiver U4, between the 1st and the 3rd pin of transceiver U6, connect capacitor C 13, between the 4th and the 5th pin of transceiver U6, connect capacitor C 14, the 2nd pin of transceiver U6 connects one end of capacitor C 12, the other end of capacitor C 12 is connected with the negative pole of polar capacitor C17, and ground connection, there is the positive pole of polar capacitor C17 to be connected to the 16th pin of transceiver U6, the 6th pin of transceiver U6 connects one end of capacitor C 15, the other end ground connection of capacitor C 15, the 4th of power supply monitoring and hardware watchdog chip U5 is connected with the 2nd pin, and one end of contact resistance R22, the other end of resistance R 22 is connected to the 7th pin of power supply monitoring and hardware watchdog chip U5, and connect one end of capacitor C 11 simultaneously, the other end ground connection of capacitor C 11, one end of the 6th pin contact resistance R41 of power supply monitoring and hardware watchdog chip U5, the other end of resistance R 41 is connected to the 3rd pin of power supply monitoring and hardware watchdog chip U5, the 1st of power supply monitoring and hardware watchdog chip U5 is connected with the 8th pin, the 485A end of

terminals P

4 and 485B end are connected respectively to the 6th and the 7th pin of transceiver U4, between input circuit and central processing unit circuit, the secondary winding negative pole end of voltage transformer pt 201～PT204 is all connected to the 28th pin of microcontroller U1, the other end of resistance R 201, R203, R205 and R207 is connected respectively to 34th～37 pins of microcontroller U1, between demonstration and function circuit and central processing unit circuit, the other end of resistance R 601～R606 is connected respectively to 58th～60,63～65 pins of microcontroller U1, between output circuit and central processing unit circuit, drive 1st～4 pins of chip U7 to be connected respectively to 87th～90 pins of microcontroller U1, the 3rd pin of isolating transmitter DC1 is connected to the 40th pin of microcontroller U1, between accessory circuit and central processing unit circuit, the the 1st, the 2nd and the 4th pin of transceiver U4 is connected respectively to the 112nd, the 113rd and the 111st pin of microcontroller U1, the the 9th and the 10th pin of transceiver U6 is connected respectively to the 102nd and the 101st pin of microcontroller U1, and the 6th and the 7th pin of power supply monitoring and hardware watchdog chip U5 is connected respectively to the 26th and the 25th pin of microcontroller U1, between accessory circuit and demonstration and function circuit, be connected respectively to the 7th and the 8th pin of transceiver U6 with the 4th and the 5th pin of the liquid crystal display YJ1 of touch-screen.

The utility model has the advantages that: 1. in the time that small current neutral grounding system is normally worked, can amplification system neutral point displacement voltage, system is not produced to any impact, 2. in most of the cases, fault point not punctures completely, when phase voltage insulate withstand voltage lower than fault point, just can not produce arc discharge, and this device is in the time of small current neutral grounding system generation single phase ground fault, can detection failure point insulating withstand voltage, by active pressure regulation assembly, fault phase limiting voltage is insulated below withstand voltage in fault point, not always zero, thereby avoid the generation of arc overvoltage, reach the object of extinguishing arc pressure limiting, simultaneously, normal phase voltage can always not be elevated to line voltage levvl yet, it is relatively safer when system is operated with failure, 3. when after earth point insulation recovery, can automatically exit guard mode, 4. after faulty line exits, can automatically exit guard mode, facilitate searching of faulty line.

Accompanying drawing explanation

Fig. 1 is the piece electrical structural representation of the utility model the first execution mode;

Fig. 2 is the piece electrical structural representation of the utility model the second execution mode;

Fig. 3 is the electrical structure schematic diagram of the first execution mode of active pressure regulation assembly;

Fig. 4 is the electrical structure schematic diagram of the second execution mode of active pressure regulation assembly;

Fig. 5 is the power circuit principle figure of intelligent controller;

Fig. 6 is the input circuit schematic diagram of intelligent controller;

Fig. 7 is the central processing unit circuit theory diagrams of intelligent controller;

Fig. 8 is demonstration and the function circuit schematic diagram of intelligent controller;

Fig. 9 is the output circuit schematic diagram of intelligent controller;

Figure 10 is the accessory circuit schematic diagram of intelligent controller.

Embodiment

As Figure 1-4, a kind of active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system, it is characterized in that: comprise intelligent controller 6 and active pressure regulation assembly 5, intelligent controller 6 is for each phase voltage and the residual voltage of Real-Time Monitoring electric power system, in the time of electric power system generation single phase ground fault, control conducting and the on-state rate of active pressure regulation assembly 5, and by earth fault in higher level's outgoing line cabinet cable 1 by active pressure regulation assembly 5 with systematically 7 be connected; Active pressure regulation assembly 5 is for regulating fault phase voltage to earth; make fault phase voltage lower than the fault point withstand voltage that insulate, eliminate fault point and discharge over the ground, thereby avoid arc overvoltage electric power system to be moved to the harm causing; and after the insulation recovery of fault point, automatically exit guard mode.

As shown in Figure 1, this extinguishing arc protective arrangement for limiting output voltage also comprises three

vacuum contactors

2, 3, 4, described active pressure regulation assembly 5 has one group, three

vacuum contactors

2, 3, the stationary contact of 4 main contacts respectively with the A of higher level's outgoing line cabinet cable 1, B, C three-phase is connected, three

vacuum contactors

2, 3, after the movable contact head end of 4 main contacts links together, be connected with the end of incoming cables of described one group of active pressure regulation assembly 5, the leading-out terminal of active pressure regulation assembly 5 with systematically 7 be connected, three

contactors

2, 3, 4 coil and active pressure regulation assembly 5 are all electrically connected with intelligent controller 6, intelligent controller 6 is connected in the three-phase four-wire system AC power of electric power system, the three-phase voltage U A of Real-Time Monitoring electric power system, UB and UC and residual voltage U0.In the time of electric power system generation single phase ground fault, intelligent controller 6 is controlled the main contacts closure of the

vacuum contactor

2 or 3 or 4 being connected with fault phase, and control conducting and the on-state rate of this group of active pressure regulation assembly 5 simultaneously, by earth fault in higher level's outgoing line cabinet cable 1 by this group active pressure regulation assembly 5 with systematically 7 be connected, and regulate fault phase voltage to earth by this group active pressure regulation assembly 5, make fault phase voltage lower than the fault point withstand voltage that insulate, eliminating fault point discharges over the ground, thereby avoid arc overvoltage electric power system to be moved to the harm causing, and after the insulation recovery of fault point, automatically exit guard mode.

As shown in Figure 2, described active pressure regulation assembly 5 has three groups, the end of incoming cables of three groups of active pressure regulation assemblies 5 is connected with A, B, the C three-phase of higher level's outgoing line cabinet cable 1 respectively, after the leading-out terminal of three groups of active pressure regulation assemblies 5 links together, with systematically 7 be connected, three groups of active pressure regulation assemblies 5 are all electrically connected with intelligent controller 6, and intelligent controller 6 is connected in the three-phase four-wire system AC power of electric power system, three-phase voltage U A, the UB of Real-Time Monitoring electric power system and UC and residual voltage U0.In the time of electric power system generation single phase ground fault, intelligent controller 6 is controlled conducting and the on-state rate of the active pressure regulation assembly 5 being connected with fault phase in three groups of active pressure regulation assemblies 5, by earth fault in higher level's outgoing line cabinet cable 1 by this active pressure regulation assembly with systematically 7 be connected, and regulate fault phase voltage to earth by this active pressure regulation assembly 5, make fault phase voltage lower than the fault point withstand voltage that insulate, eliminating fault point discharges over the ground, thereby avoid arc overvoltage electric power system to be moved to the harm causing, and after the insulation recovery of fault point, automatically exit guard mode.

As shown in Figure 3, described active pressure regulation assembly 5 is by some great power bidirectional controllable silicons 8, some silicon controlled rectifier protecting unit 9 and trigger control unit A10 form, between two anodes of every great power bidirectional controllable silicon 8, be parallel with a silicon controlled rectifier protecting unit 9, after some great power bidirectional controllable silicons 8 are connected by its some antianodes, the second plate of first great power bidirectional controllable silicon 8 is the end of incoming cables of active pressure regulation assembly 5, the first anode of last part great power bidirectional controllable silicon 8 is the leading-out terminal of active pressure regulation assembly 5, with systematically 7 be connected, the control of some great power bidirectional controllable silicons 8 is extremely all electrically connected with trigger control unit A10, trigger control unit A10 is electrically connected with intelligent controller 6.Trigger control unit A 10 receives the control signal from intelligent controller 6, regulates the on-state rate of some great power bidirectional controllable silicons 8 of series connection.

As shown in Figure 4, described active pressure regulation assembly 5 is by some great power bidirectional IGBT elements, IGBT element protection unit 12 and trigger control unit B13 form, every great power bidirectional IGBT element is made up of two high-power IGBT elements 11, wherein the collector and emitter of a high-power IGBT element 11 is connected with the emitter and collector of another part high-power IGBT element 11 respectively, between two common ports of every great power bidirectional IGBT element, be parallel with an IGBT element protection unit 12, some great power bidirectional IGBT elements are some to after common port series connection by it, the upper common port of first great power bidirectional IGBT element is the end of incoming cables of active pressure regulation assembly 5, the lower common port of last part great power bidirectional IGBT element is the leading-out terminal of active pressure regulation assembly 5, with systematically 7 be connected, two gate terminal of every great power bidirectional IGBT element are all electrically connected with trigger control unit B13, trigger control unit B13 is electrically connected with intelligent controller 6.Trigger control unit B 13 receives the control signal from intelligent controller 6, regulates the on-state rate of some great power bidirectional IGBT elements of series connection.

As shown in Figure 5-10, described intelligent controller 6 is by power circuit 14, input circuit 15, central processing unit circuit 16, show and function circuit 17, output circuit 18 and accessory circuit 19 form, in described power circuit 14, there is terminals P 1, Switching Power Supply DY1, 3.3V chip operation power circuit and AD sampling reference power source circuit, wherein, in 3.3V chip operation power circuit, there is low-dropout regulator U2, resistance R 1, there are polar capacitor C1 and C2, capacitor C 5 and C6 and light-emitting diode D1, the model of its low-dropout regulator U2 is LM1117MP-3.3, in AD sampling reference power source circuit, there is low-dropout regulator U3, resistance R 2 and R3, there are polar capacitor C3 and C4 and capacitor C 7, C8 and C9, the model of its low-dropout regulator U3 is LM1117MP-ADJ, in input circuit 15, there are terminals P 2, voltage transformer pt 201～PT204, resistance R 201～R208 and capacitor C 201～C204, in central processing unit circuit 16, have microcontroller U1, crystal oscillator JT1, resistance R 17～R19, capacitor C 18 and C19 and light-emitting diode D4, the model of its microcontroller U1 is STM32F103ZE, in demonstration and function circuit 17, there is liquid crystal display YJ1, resistance R 601～R607 and the light-emitting diode D601～D607 with touch-screen, in output circuit 18, have the chip of driving U7, electromagnetic relay JQ301～JQ304, diode D301～D304, isolating transmitter DC1 and terminals P 3, it drives the model of chip U7 is ULN2004A, and the model of isolating transmitter DC1 is TS160D/S-3.3, in accessory circuit 19, there are transceiver U4, transceiver U6, power supply monitoring and hardware watchdog chip U5, resistance R 20, R22 and R41, capacitor C 10～C15, have polar capacitor C16 and C17 and terminals P 4,

Its circuit connecting relation is: in power circuit 14, Switching Power Supply DY1 provides working power for described intelligent controller 6 complete machines, its input splicing ear P1, terminals P 1 connects transformer station's alternating current 220V control power supply, the output end of Switching Power Supply DY1, 5V-end and 12V-hold ground connection after mutual short circuit, 5V+ end output+5V DC power supply VCC, 12V+ end output+12V DC power supply, in 3.3V chip operation power circuit, the 3rd pin connection+5V DC power supply VCC of low-dropout regulator U2, be connected with the positive pole of polar capacitor C1 and one end of capacitor C 5 simultaneously, ground connection after having the negative pole of polar capacitor C1 to be connected with the other end of capacitor C 5, the 1st pin ground connection of low-dropout regulator U2, and be connected with the negative pole of polar capacitor C2 and one end of capacitor C 6 simultaneously, there are the positive pole of polar capacitor C2 and the other end of capacitor C 6 to be connected to the 2nd pin of low-dropout regulator U2, the 2nd pin output 3.3V chip operation power supply of low-dropout regulator U2, one end of resistance R 1 is connected with the positive pole of polar capacitor C2, the positive pole of the other end connecting luminous diode D1 of resistance R 1, the negative pole of light-emitting diode D1 is connected with the negative pole that has polar capacitor C2, in AD sampling reference power source circuit, the 3rd pin connection+5V DC power supply VCC of low-dropout regulator U3, be connected with the positive pole of polar capacitor C3 and one end of capacitor C 7 simultaneously, ground connection after having the negative pole of polar capacitor C3 to be connected with the other end of capacitor C 7, one end of the 1st pin contact resistance R2 of low-dropout regulator U3, one end of one end of resistance R 3 and capacitor C 8, ground connection after the other end of resistance R 2 is connected with the other end of capacitor C 8, and be connected with the negative pole of polar capacitor C4 and one end of capacitor C 9 simultaneously, the other end of contact resistance R3 after having the positive pole of polar capacitor C4 to be connected with the other end of capacitor C 9, the other end of resistance R 3 is connected to the 2nd pin of low-dropout regulator U3, the 2nd pin output 1.65V AD sampling reference power source of low-dropout regulator U3, in input circuit 15, a winding of voltage transformer pt 201 just, negative pole end is connected respectively to U0L end and the U0N end of terminals P 2, the secondary winding of voltage transformer pt 201 just, one end of negative pole end difference contact resistance R201 and one end of resistance R 202, one end of resistance R 202 connects one end of capacitor C 201, the other end ground connection of capacitor C 201, the other end of resistance R 201 is drawn signal U0, and be connected with the other end of resistance R 202, a winding of voltage transformer pt 202 just, negative pole end is connected respectively to UAL end and the UAN end of terminals P 2, the secondary winding of voltage transformer pt 202 just, one end of negative pole end difference contact resistance R203 and one end of resistance R 204, one end of resistance R 204 connects one end of capacitor C 202, the other end ground connection of capacitor C 202, the other end of resistance R 203 is drawn signal UA, and be connected with the other end of resistance R 204, a winding of voltage transformer pt 203 just, negative pole end is connected respectively to UBL end and the UBN end of terminals P 2, the secondary winding of voltage transformer pt 203 just, one end of negative pole end difference contact resistance R205 and one end of resistance R 206, one end of resistance R 206 connects one end of capacitor C 203, the other end ground connection of capacitor C 203, the other end of resistance R 205 is drawn signal UB, and be connected with the other end of resistance R 206, a winding of voltage transformer pt 204 just, negative pole end is connected respectively to UCL end and the UCN end of terminals P 2, the secondary winding of voltage transformer pt 204 just, one end of negative pole end difference contact resistance R207 and one end of resistance R 208, one end of resistance R 208 connects one end of capacitor C 204, the other end ground connection of capacitor C 204, the other end of resistance R 207 is drawn signal UC, and be connected with the other end of resistance R 208, the U0L end of terminals P 2, UAL end, UBL end is connected the three-phase four-wire system AC power of electric power system with UCL end, in central processing unit circuit 16, the 32nd pin of microcontroller U1 connects 3.3V chip operation power supply, the 17th of microcontroller U1, the 33rd, the 39th, the 52nd, the 62nd, the 72nd, the 84th, the 95th, the 108th, the 121st, after the mutual short circuit of the 131st and the 144th pin, connect 3.3V chip operation power supply, 28 pins of microcontroller U1 connect 1.65V AD sampling reference power source, the 29th pin ground connection of microcontroller U1, the 16th of microcontroller U1, the 30th, the 31st, the 38th, the 51st, the 61st, the 71st, the 83rd, the 94th, the 107th, the 120th, ground connection after the mutual short circuit of the 130th and the 143rd pin, after crystal oscillator JT1 is in parallel with resistance R 18, its one end connects one end of capacitor C 19, and be connected to the 24th pin of microcontroller U1 simultaneously, its other end connects one end of capacitor C 18, and be connected to the 23rd pin of microcontroller U1 simultaneously, the other end of capacitor C 18 is connected with the other end of capacitor C 19, and be connected to the 30th pin of microcontroller U1 simultaneously, one end of resistance R 17 is connected to the 18th pin of microcontroller U1, the other end connecting luminous diode D4 positive pole of resistance R 17, light-emitting diode D4 minus earth, the two ends of resistance R 19 are connected respectively to the 16th and the 138th pin of microcontroller U1, in demonstration and function circuit 17, with the 1st pin connection+5V DC power supply of the liquid crystal display YJ1 of touch-screen, with the 8th pin ground connection of the liquid crystal display YJ1 of touch-screen, one end of resistance R 601～R607 is the positive pole of connecting luminous diode D601～D607 respectively, the negative pole of light-emitting diode D601～D607 interconnects, the other end connection+5V DC power supply VCC of resistance R 607, in output circuit 18, drive the 9th pin connection+12V DC power supply of chip U7, drive the 8th pin ground connection of chip U7, one end all connect+12V DC power supply of electromagnetic relay JQ301～JQ304 coil, and connect respectively the negative pole of diode D301～D304, the other end of electromagnetic relay JQ301～JQ304 coil is connected respectively to 16th～13 pins that drive chip U7, and connect respectively the positive pole of diode D301～D304, one end of electromagnetic relay JQ301～JQ304 normally opened contact is connected respectively to the HZA end of terminals P 3, HZB end, HZC end and BJ1 end, the other end of electromagnetic relay JQ301～JQ303 normally opened contact is all connected to the COM end of terminals P 3, the other end of electromagnetic relay JQ304 normally opened contact is connected to the BJ2 end of terminals P 3, the 7th pin connection+5V DC power supply VCC of isolating transmitter DC1, the equal ground connection of the 4th and the 8th pin of isolating transmitter DC1, the the 1st and the 2nd pin of isolating transmitter DC1 is connected respectively to OUT-end and the OUT+ end of terminals P 3, in accessory circuit 19, the 8th pin of transceiver U4, the 2nd pin of the 16th pin of transceiver U6 and power supply monitoring and hardware watchdog chip U5 is all connected 3.3V chip operation power supply, the 5th pin of transceiver U4, the equal ground connection of the 3rd pin of the 15th pin of transceiver U6 and power supply monitoring and hardware watchdog chip U5, one end of the 6th pin contact resistance R20 of transceiver U4, the other end of resistance R 20 connects the 7th pin of transceiver U4, one end of capacitor C 10 is connected with the positive pole of polar capacitor C16, and connect 3.3V chip operation power supply simultaneously, after the other end of capacitor C 10 is connected with the negative pole that has polar capacitor C16, be connected to the 5th pin of transceiver U4, between the 1st and the 3rd pin of transceiver U6, connect capacitor C 13, between the 4th and the 5th pin of transceiver U6, connect capacitor C 14, the 2nd pin of transceiver U6 connects one end of capacitor C 12, the other end of capacitor C 12 is connected with the negative pole of polar capacitor C17, and ground connection, there is the positive pole of polar capacitor C17 to be connected to the 16th pin of transceiver U6, the 6th pin of transceiver U6 connects one end of capacitor C 15, the other end ground connection of capacitor C 15, the 4th of power supply monitoring and hardware watchdog chip U5 is connected with the 2nd pin, and one end of contact resistance R22, the other end of resistance R 22 is connected to the 7th pin of power supply monitoring and hardware watchdog chip U5, and connect one end of capacitor C 11 simultaneously, the other end ground connection of capacitor C 11, one end of the 6th pin contact resistance R41 of power supply monitoring and hardware watchdog chip U5, the other end of resistance R 41 is connected to the 3rd pin of power supply monitoring and hardware watchdog chip U5, the 1st of power supply monitoring and hardware watchdog chip U5 is connected with the 8th pin, the 485A end of

terminals P

4 and 485B end are connected respectively to the 6th and the 7th pin of transceiver U4, between input circuit 15 and central processing unit circuit 16, the secondary winding negative pole end of voltage transformer pt 201～PT204 is all connected to the 28th pin of microcontroller U1, the other end of resistance R 201, R203, R205 and R207 is connected respectively to 34th～37 pins of microcontroller U1, between demonstration and function circuit 17 and central processing unit circuit 16, the other end of resistance R 601～R606 is connected respectively to 58th～60,63～65 pins of microcontroller U1, between output circuit 18 and central processing unit circuit 16, drive 1st～4 pins of chip U7 to be connected respectively to 87th～90 pins of microcontroller U1, the 3rd pin of isolating transmitter DC1 is connected to the 40th pin of microcontroller U1, between accessory circuit 19 and central processing unit circuit 16, the the 1st, the 2nd and the 4th pin of transceiver U4 is connected respectively to the 112nd, the 113rd and the 111st pin of microcontroller U1, the the 9th and the 10th pin of transceiver U6 is connected respectively to the 102nd and the 101st pin of microcontroller U1, and the 6th and the 7th pin of power supply monitoring and hardware watchdog chip U5 is connected respectively to the 26th and the 25th pin of microcontroller U1, between accessory circuit 19 and demonstration and function circuit 17, be connected respectively to the 7th and the 8th pin of transceiver U6 with the 4th and the 5th pin of the liquid crystal display YJ1 of touch-screen.

Operation principle of the present utility model is: in the time that the utility model adopts the connected mode shown in Fig. 1 for the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage of small current neutral grounding system, the coil of three

vacuum contactors

2,3,4 on extinguishing arc protective arrangement for limiting output voltage can be connected with the normally opened contact of electromagnetic relay JQ301～JQ303 in intelligent controller 6 by terminals P 3 respectively, one group on extinguishing arc protective arrangement for limiting output voltage active pressure regulation assembly 5 is connected to by terminals P 3 between the 2nd and the 1st pin of isolating transmitter DC1 in intelligent controller 6, in intelligent controller 6, microcontroller U1 is by three-phase voltage signal UA, UB and UC and the residual voltage signal U0 of input circuit 15 Real-time Collection electric power systems, when electric power system is a certain while there is single phase ground fault mutually, microcontroller U1, by the three-phase voltage signal to electric power system and the analysis of residual voltage signal, judges fault separate, as there is mutually single phase ground fault in the A of electric power system, the 87th pin output A phase switching signal SCA of microcontroller U1, the driving chip U7 of A phase switching signal SCA in output circuit 18 amplifies rear drive electromagnetic relay JQ301 action, driven the main contacts closure of the vacuum contactor 2 being connected with fault phase (A phase) on this extinguishing arc protective arrangement for limiting output voltage by electromagnetic relay JQ301, simultaneously, the 40th pin output analog control signal DAC1 of microcontroller U1, by the isolating transmitter DC1 in output circuit 18 by this signal isolation transmit the trigger control unit to one group of active pressure regulation assembly 5 on extinguishing arc protective arrangement for limiting output voltage, control active pressure regulation assembly 5 conductings of this group and on-state rate, make the active pressure regulation assembly 5 of this group and fault phase (A phase) and systematically 7 be communicated with, and regulate fault phase voltage to earth by the active pressure regulation assembly 5 of this group, make fault phase voltage lower than the fault point withstand voltage that insulate, to eliminate fault point arc discharge over the ground, the 90th pin output alarm control signal SCBJ of microcontroller U1 simultaneously, alarm control signal SCBJ is through driving chip U7 to amplify rear drive electromagnetic relay JQ304 action, and therefore user can utilize the normally opened contact of electromagnetic relay JQ304 to connect warning device, in addition, microcontroller U1 also can be by the 101st and the 102nd pin output display signal U1TX and U1RX simultaneously, display U1TX and the U1RX transceiver U6 in accessory circuit 19 is input to the liquid crystal display YJ1 with touch-screen in demonstration and function circuit 17, the action message of A phase earth fault and extinguishing arc protective arrangement for limiting output voltage in demonstration higher level outgoing line cabinet cable 1, and the information such as separate, time of earth fault occur record, facilitate user to consult, when intelligent controller 6 monitors after the disappearance of electric power system earth fault, intelligent controller 6 can disconnect electromagnetic relay JQ301 and JQ304 and analog control signal DAC1, and the system that restores electricity is normally moved.

In the time that the utility model adopts the connected mode shown in Fig. 2 for the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage of small current neutral grounding system, on extinguishing arc protective arrangement for limiting output voltage three groups can be connected with the normally opened contact of electromagnetic relay JQ301～JQ303 in intelligent controller 6 by terminals P 3 respectively by active pressure regulation assembly 5, the normally opened contact of electromagnetic relay JQ301～JQ303 is all connected between the 2nd and the 1st pin of isolating transmitter DC1 in intelligent controller 6 by terminals P 3, in intelligent controller 6, microcontroller U1 is by three-phase voltage signal UA, UB and UC and the residual voltage signal U0 of input circuit 15 Real-time Collection electric power systems, when electric power system is a certain while there is single phase ground fault mutually, microcontroller U1, by the three-phase voltage signal to electric power system and the analysis of residual voltage signal, judges fault separate, as there is mutually single phase ground fault in the A of electric power system, the 87th pin output A phase switching signal SCA of microcontroller U1, the driving chip U7 of the mutually active pressure regulation assembly of A switching signal SCA in output circuit 18 amplifies rear drive electromagnetic relay JQ301 action, analog control signal DAC1 isolating transmitter DC1 isolation in output circuit 18 being exported by electromagnetic relay JQ301, deliver to the trigger control unit of the active pressure regulation assembly 5 being connected with fault phase (A phase), control this and organize active pressure regulation assembly 5 conductings and on-state rate, make this organize active pressure regulation assembly 5 and fault phase (A phase) and systematically 7 be communicated with, and organize active pressure regulation assembly 5 by this and regulate fault phase voltage to earth, make fault phase voltage lower than the fault point withstand voltage that insulate, to eliminate fault point arc discharge over the ground, the course of action of intelligent controller 6 after the course of action of course of action, display U1TX and the U1RX of alarm control signal SCBJ and electric power system earth fault disappear, the course of action while adopting connected mode shown in Fig. 1 with extinguishing arc protective arrangement for limiting output voltage is identical.

Claims

1. the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system, it is characterized in that: comprise intelligent controller (6) and active pressure regulation assembly (5), intelligent controller (6) is for each phase voltage and the residual voltage of Real-Time Monitoring electric power system, in the time of electric power system generation single phase ground fault, control conducting and the on-state rate of active pressure regulation assembly (5), and earth fault in higher level's outgoing line cabinet cable (1) is connected with systematically (7) by active pressure regulation assembly (5) mutually; Active pressure regulation assembly (5) is for regulating fault phase voltage to earth; make fault phase voltage lower than the fault point withstand voltage that insulate; eliminating fault point discharges over the ground; thereby avoid arc overvoltage electric power system to be moved to the harm causing; and after the insulation recovery of fault point, automatically exit guard mode.

2. the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system according to claim 1, it is characterized in that: this extinguishing arc protective arrangement for limiting output voltage also comprises three vacuum contactors (2, 3, 4), described active pressure regulation assembly (5) has one group, three vacuum contactors (2, 3, 4) stationary contact of main contacts respectively with the A of higher level's outgoing line cabinet cable (1), B, C three-phase is connected, three vacuum contactors (2, 3, 4) after the movable contact head end of main contacts links together, be connected with the end of incoming cables of described one group of active pressure regulation assembly (5), the leading-out terminal of active pressure regulation assembly (5) is connected with systematically (7), three contactors (2, 3, 4) coil and active pressure regulation assembly (5) are all electrically connected with intelligent controller (6), intelligent controller (6) is connected in the three-phase four-wire system AC power of electric power system, the three-phase voltage U A of Real-Time Monitoring electric power system, UB and UC and residual voltage U0.

3. the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system according to claim 1, it is characterized in that: described active pressure regulation assembly (5) has three groups, the end of incoming cables of three groups of active pressure regulation assemblies (5) respectively with the A of higher level's outgoing line cabinet cable (1), B, C three-phase is connected, after the leading-out terminal of three groups of active pressure regulation assemblies (5) links together, be connected with systematically (7), three groups of active pressure regulation assemblies (5) are all electrically connected with intelligent controller (6), intelligent controller (6) is connected in the three-phase four-wire system AC power of electric power system, the three-phase voltage U A of Real-Time Monitoring electric power system, UB and UC and residual voltage U0.

4. according to the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system described in claim 1 or 2 or 3, it is characterized in that: described active pressure regulation assembly (5) is by some great power bidirectional controllable silicons (8), some silicon controlled rectifier protecting unit (9) and trigger control unit A(10) form, between two anodes of every great power bidirectional controllable silicon (8), be parallel with a silicon controlled rectifier protecting unit (9), after some great power bidirectional controllable silicons (8) are connected by its some antianodes, the second plate of first great power bidirectional controllable silicon (8) is the end of incoming cables of active pressure regulation assembly (5), the first anode of last part great power bidirectional controllable silicon (8) is the leading-out terminal of active pressure regulation assembly (5), be connected with systematically (7), the control of some great power bidirectional controllable silicons (8) extremely all with trigger control unit A(10) be electrically connected, trigger control unit A(10) be electrically connected with intelligent controller (6).

5. according to the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system described in claim 1 or 2 or 3, it is characterized in that: described active pressure regulation assembly (5) is by some great power bidirectional IGBT elements, IGBT element protection unit (12) and trigger control unit B(13) form, every great power bidirectional IGBT element is made up of two high-power IGBT elements (11), wherein the collector and emitter of a high-power IGBT element (11) is connected with the emitter and collector of another part high-power IGBT element (11) respectively, between two common ports of every great power bidirectional IGBT element, be parallel with an IGBT element protection unit (12), some great power bidirectional IGBT elements are some to after common port series connection by it, the upper common port of first great power bidirectional IGBT element is the end of incoming cables of active pressure regulation assembly (5), the lower common port of last part great power bidirectional IGBT element is the leading-out terminal of active pressure regulation assembly (5), be connected with systematically (7), two gate terminal of every great power bidirectional IGBT element all with trigger control unit B(13) be electrically connected, trigger control unit B(13) be electrically connected with intelligent controller (6).

6. according to the active voltage-regulation type extinguishing arc protective arrangement for limiting output voltage for small current neutral grounding system described in claim 1 or 2 or 3, it is characterized in that: described intelligent controller (6) is by power circuit (14), input circuit (15), central processing unit circuit (16), show and function circuit (17), output circuit (18) and accessory circuit (19) form, described power circuit has terminals P 1 in (14), Switching Power Supply DY1, 3.3V chip operation power circuit and AD sampling reference power source circuit, wherein, in 3.3V chip operation power circuit, there is low-dropout regulator U2, resistance R 1, there are polar capacitor C1 and C2, capacitor C 5 and C6 and light-emitting diode D1, the model of its low-dropout regulator U2 is LM1117MP-3.3, in AD sampling reference power source circuit, there is low-dropout regulator U3, resistance R 2 and R3, there are polar capacitor C3 and C4 and capacitor C 7, C8 and C9, the model of its low-dropout regulator U3 is LM1117MP-ADJ, in input circuit (15), there are terminals P 2, voltage transformer pt 201～PT204, resistance R 201～R208 and capacitor C 201～C204, in central processing unit circuit (16), have microcontroller U1, crystal oscillator JT1, resistance R 17～R19, capacitor C 18 and C19 and light-emitting diode D4, the model of its microcontroller U1 is STM32F103ZE, in demonstration and function circuit (17), there is liquid crystal display YJ1, resistance R 601～R607 and the light-emitting diode D601～D607 with touch-screen, in output circuit (18), there are the chip of driving U7, electromagnetic relay JQ301～JQ304, diode D301～D304, isolating transmitter DC1 and terminals P 3, it drives the model of chip U7 is ULN2004A, and the model of isolating transmitter DC1 is TS160D/S-3.3, in accessory circuit (19), there are transceiver U4, transceiver U6, power supply monitoring and hardware watchdog chip U5, resistance R 20, R22 and R41, capacitor C 10～C15, have polar capacitor C16 and C17 and terminals P 4,

Its circuit connecting relation is: in power circuit (14), Switching Power Supply DY1 is that described intelligent controller (6) complete machine provides working power, its input splicing ear P1, terminals P 1 connects transformer station's alternating current 220V control power supply, the output end of Switching Power Supply DY1, 5V-end and 12V-hold ground connection after mutual short circuit, 5V+ end output+5V DC power supply VCC, 12V+ end output+12V DC power supply, in 3.3V chip operation power circuit, the 3rd pin connection+5V DC power supply VCC of low-dropout regulator U2, be connected with the positive pole of polar capacitor C1 and one end of capacitor C 5 simultaneously, ground connection after having the negative pole of polar capacitor C1 to be connected with the other end of capacitor C 5, the 1st pin ground connection of low-dropout regulator U2, and be connected with the negative pole of polar capacitor C2 and one end of capacitor C 6 simultaneously, there are the positive pole of polar capacitor C2 and the other end of capacitor C 6 to be connected to the 2nd pin of low-dropout regulator U2, the 2nd pin output 3.3V chip operation power supply of low-dropout regulator U2, one end of resistance R 1 is connected with the positive pole of polar capacitor C2, the positive pole of the other end connecting luminous diode D1 of resistance R 1, the negative pole of light-emitting diode D1 is connected with the negative pole that has polar capacitor C2, in AD sampling reference power source circuit, the 3rd pin connection+5V DC power supply VCC of low-dropout regulator U3, be connected with the positive pole of polar capacitor C3 and one end of capacitor C 7 simultaneously, ground connection after having the negative pole of polar capacitor C3 to be connected with the other end of capacitor C 7, one end of the 1st pin contact resistance R2 of low-dropout regulator U3, one end of one end of resistance R 3 and capacitor C 8, ground connection after the other end of resistance R 2 is connected with the other end of capacitor C 8, and be connected with the negative pole of polar capacitor C4 and one end of capacitor C 9 simultaneously, the other end of contact resistance R3 after having the positive pole of polar capacitor C4 to be connected with the other end of capacitor C 9, the other end of resistance R 3 is connected to the 2nd pin of low-dropout regulator U3, the 2nd pin output 1.65V AD sampling reference power source of low-dropout regulator U3, in input circuit (15), a winding of voltage transformer pt 201 just, negative pole end is connected respectively to U0L end and the U0N end of terminals P 2, the secondary winding of voltage transformer pt 201 just, one end of negative pole end difference contact resistance R201 and one end of resistance R 202, one end of resistance R 202 connects one end of capacitor C 201, the other end ground connection of capacitor C 201, the other end of resistance R 201 is drawn signal U0, and be connected with the other end of resistance R 202, a winding of voltage transformer pt 202 just, negative pole end is connected respectively to UAL end and the UAN end of terminals P 2, the secondary winding of voltage transformer pt 202 just, one end of negative pole end difference contact resistance R203 and one end of resistance R 204, one end of resistance R 204 connects one end of capacitor C 202, the other end ground connection of capacitor C 202, the other end of resistance R 203 is drawn signal UA, and be connected with the other end of resistance R 204, a winding of voltage transformer pt 203 just, negative pole end is connected respectively to UBL end and the UBN end of terminals P 2, the secondary winding of voltage transformer pt 203 just, one end of negative pole end difference contact resistance R205 and one end of resistance R 206, one end of resistance R 206 connects one end of capacitor C 203, the other end ground connection of capacitor C 203, the other end of resistance R 205 is drawn signal UB, and be connected with the other end of resistance R 206, a winding of voltage transformer pt 204 just, negative pole end is connected respectively to UCL end and the UCN end of terminals P 2, the secondary winding of voltage transformer pt 204 just, one end of negative pole end difference contact resistance R207 and one end of resistance R 208, one end of resistance R 208 connects one end of capacitor C 204, the other end ground connection of capacitor C 204, the other end of resistance R 207 is drawn signal UC, and be connected with the other end of resistance R 208, the U0L end of terminals P 2, UAL end, UBL end is connected the three-phase four-wire system AC power of electric power system with UCL end, in central processing unit circuit (16), the 32nd pin of microcontroller U1 connects 3.3V chip operation power supply, the 17th of microcontroller U1, the 33rd, the 39th, the 52nd, the 62nd, the 72nd, the 84th, the 95th, the 108th, the 121st, after the mutual short circuit of the 131st and the 144th pin, connect 3.3V chip operation power supply, 28 pins of microcontroller U1 connect 1.65V AD sampling reference power source, the 29th pin ground connection of microcontroller U1, the 16th of microcontroller U1, the 30th, the 31st, the 38th, the 51st, the 61st, the 71st, the 83rd, the 94th, the 107th, the 120th, ground connection after the mutual short circuit of the 130th and the 143rd pin, after crystal oscillator JT1 is in parallel with resistance R 18, its one end connects one end of capacitor C 19, and be connected to the 24th pin of microcontroller U1 simultaneously, its other end connects one end of capacitor C 18, and be connected to the 23rd pin of microcontroller U1 simultaneously, the other end of capacitor C 18 is connected with the other end of capacitor C 19, and be connected to the 30th pin of microcontroller U1 simultaneously, one end of resistance R 17 is connected to the 18th pin of microcontroller U1, the other end connecting luminous diode D4 positive pole of resistance R 17, light-emitting diode D4 minus earth, the two ends of resistance R 19 are connected respectively to the 16th and the 138th pin of microcontroller U1, in demonstration and function circuit (17), with the 1st pin connection+5V DC power supply of the liquid crystal display YJ1 of touch-screen, with the 8th pin ground connection of the liquid crystal display YJ1 of touch-screen, one end of resistance R 601～R607 is the positive pole of connecting luminous diode D601～D607 respectively, the negative pole of light-emitting diode D601～D607 interconnects, the other end connection+5V DC power supply VCC of resistance R 607, in output circuit (18), drive the 9th pin connection+12V DC power supply of chip U7, drive the 8th pin ground connection of chip U7, one end all connect+12V DC power supply of electromagnetic relay JQ301～JQ304 coil, and connect respectively the negative pole of diode D301～D304, the other end of electromagnetic relay JQ301～JQ304 coil is connected respectively to 16th～13 pins that drive chip U7, and connect respectively the positive pole of diode D301～D304, one end of electromagnetic relay JQ301～JQ304 normally opened contact is connected respectively to the HZA end of terminals P 3, HZB end, HZC end and BJ1 end, the other end of electromagnetic relay JQ301～JQ303 normally opened contact is all connected to the COM end of terminals P 3, the other end of electromagnetic relay JQ304 normally opened contact is connected to the BJ2 end of terminals P 3, the 7th pin connection+5V DC power supply VCC of isolating transmitter DC1, the equal ground connection of the 4th and the 8th pin of isolating transmitter DC1, the the 1st and the 2nd pin of isolating transmitter DC1 is connected respectively to OUT-end and the OUT+ end of terminals P 3, in accessory circuit (19), the 8th pin of transceiver U4, the 2nd pin of the 16th pin of transceiver U6 and power supply monitoring and hardware watchdog chip U5 is all connected 3.3V chip operation power supply, the 5th pin of transceiver U4, the equal ground connection of the 3rd pin of the 15th pin of transceiver U6 and power supply monitoring and hardware watchdog chip U5, one end of the 6th pin contact resistance R20 of transceiver U4, the other end of resistance R 20 connects the 7th pin of transceiver U4, one end of capacitor C 10 is connected with the positive pole of polar capacitor C16, and connect 3.3V chip operation power supply simultaneously, after the other end of capacitor C 10 is connected with the negative pole that has polar capacitor C16, be connected to the 5th pin of transceiver U4, between the 1st and the 3rd pin of transceiver U6, connect capacitor C 13, between the 4th and the 5th pin of transceiver U6, connect capacitor C 14, the 2nd pin of transceiver U6 connects one end of capacitor C 12, the other end of capacitor C 12 is connected with the negative pole of polar capacitor C17, and ground connection, there is the positive pole of polar capacitor C17 to be connected to the 16th pin of transceiver U6, the 6th pin of transceiver U6 connects one end of capacitor C 15, the other end ground connection of capacitor C 15, the 4th of power supply monitoring and hardware watchdog chip U5 is connected with the 2nd pin, and one end of contact resistance R22, the other end of resistance R 22 is connected to the 7th pin of power supply monitoring and hardware watchdog chip U5, and connect one end of capacitor C 11 simultaneously, the other end ground connection of capacitor C 11, one end of the 6th pin contact resistance R41 of power supply monitoring and hardware watchdog chip U5, the other end of resistance R 41 is connected to the 3rd pin of power supply monitoring and hardware watchdog chip U5, the 1st of power supply monitoring and hardware watchdog chip U5 is connected with the 8th pin, the 485A end of terminals P 4 and 485B end are connected respectively to the 6th and the 7th pin of transceiver U4, between input circuit (15) and central processing unit circuit (16), the secondary winding negative pole end of voltage transformer pt 201～PT204 is all connected to the 28th pin of microcontroller U1, the other end of resistance R 201, R203, R205 and R207 is connected respectively to 34th～37 pins of microcontroller U1, between demonstration and function circuit (17) and central processing unit circuit (16), the other end of resistance R 601～R606 is connected respectively to 58th～60,63～65 pins of microcontroller U1, between output circuit (18) and central processing unit circuit (16), drive 1st～4 pins of chip U7 to be connected respectively to 87th～90 pins of microcontroller U1, the 3rd pin of isolating transmitter DC1 is connected to the 40th pin of microcontroller U1, between accessory circuit (19) and central processing unit circuit (16), the the 1st, the 2nd and the 4th pin of transceiver U4 is connected respectively to the 112nd, the 113rd and the 111st pin of microcontroller U1, the the 9th and the 10th pin of transceiver U6 is connected respectively to the 102nd and the 101st pin of microcontroller U1, and the 6th and the 7th pin of power supply monitoring and hardware watchdog chip U5 is connected respectively to the 26th and the 25th pin of microcontroller U1, between accessory circuit (19) and demonstration and function circuit (17), be connected respectively to the 7th and the 8th pin of transceiver U6 with the 4th and the 5th pin of the liquid crystal display YJ1 of touch-screen.