CN105954675B - The outdoor type high-voltage intelligent circuit breaker and its control method precisely judged based on ground connection - Google Patents

The outdoor type high-voltage intelligent circuit breaker and its control method precisely judged based on ground connection Download PDF

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Publication number
CN105954675B
CN105954675B CN201610557760.1A CN201610557760A CN105954675B CN 105954675 B CN105954675 B CN 105954675B CN 201610557760 A CN201610557760 A CN 201610557760A CN 105954675 B CN105954675 B CN 105954675B
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phase
resistance
sampling
connect
transformer
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CN105954675A (en
Inventor
宋玉锋
沈卫峰
丁菊
王春华
陆卫卫
姚卫东
纪陈平
顾明锋
顾曹新
孟领刚
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JIANGSU MODERN POWER CAPACITOR CO Ltd
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JIANGSU MODERN POWER CAPACITOR CO Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272Apparatus, systems or circuits therefor
    • G01R31/3274Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3275Fault detection or status indication
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a kind of outdoor type high-voltage intelligent circuit breakers and its control method precisely judged based on ground connection, including breaker body component S, intelligent controller, circuit-breaker switching on-off drives and transmission parts, working power and line voltage sampling transformer L1, A phase voltage sample resistances R1A, A phase sampling transformers L2A, B phase voltage sample resistances R1B, B phase sampling transformers L2B, C phase voltage sample resistances R1C, C phase sampling transformers L2C, A phase current sampling mutual inductors L3A, A phase sampling transformers L4A, B phase current sampling mutual inductors L3B, B phase sampling transformers L4B, C phase current sampling mutual inductors L3C, C phase sampling transformers L4C.The present invention, which can be grounded power grid, precisely to be judged, so as to correct starting protection or alarm.

Description

The outdoor type high-voltage intelligent circuit breaker and its control method precisely judged based on ground connection
Technical field
The present invention relates to a kind of intelligent breaker and its control method, especially a kind of open air precisely judged based on ground connection Formula high-voltage intelligent circuit breaker and its control method.
Background technology
Outdoor type high-voltage circuitbreaker is used widely in for electricity consumption power grid, the important base as high voltage power distribution and electricity consumption Plinth equipment ensures the safety and economic operation of power grid.In recent years, outdoor type high-voltage circuitbreaker develops to intelligent direction, once Switch, current transformer, voltage transformer etc. are combined with secondary automation equipment, become outdoor type high-voltage intelligent circuit breaker, With comprehensive automations such as measurement, control, protection, signal, movement, self diagnosis(Or it is intelligent)Function, as with electricity consumption power grid Automatic circuit, boundary device in automated system etc..
Existing outdoor type high-voltage intelligent circuit breaker have electric current speed cut, overcurrent, overload, overvoltage, it is under-voltage, ground connection etc. compare Complete defencive function, to ensure power grid security, economical operation.Its major defect be according to ground connection judge and implement protection, Alarm is not accurate enough, namely practical ground connection does not monitor and reality is judged as being grounded without ground connection, as a result compromises power grid Safety, economical operation, and then influence the normal production of vast electricity consumer, live.
Lack a kind of can be grounded power grid currently on the market precisely judge, so as to correct starting protection or alarm And outdoor type high-voltage intelligent circuit breaker simple for structure, reliable for operation, easy to maintain.
Invention content
Technical problem to be solved by the invention is to provide a kind of outdoor type high-voltage intelligent precisely judged based on ground connection is disconnected Road device and its control method, it, which can be grounded power grid, precisely judges, so as to correct starting protection or alarm.
In order to solve the above technical problems, the technical solution adopted in the present invention is:
A kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection, it is characterised in that:Including breaker body Component S, intelligent controller, circuit-breaker switching on-off driving and transmission parts, working power, line voltage sampling transformer L1, A phase electricity Pressure sample resistance R1A, A phase sampling transformer L2A, B phase voltage sample resistance R1B, B phase sampling transformer L2B, C phase voltage takes Sample resistance R1C, C phase sampling transformer L2C, A phase current sampling mutual inductor L3A, A phase sampling transformer L4A, B phase current samples Mutual inductor L3B, B phase sampling transformer L4B, C phase current sampling mutual inductor L3C, C phase sampling transformer L4C, breaker body portion Part is connected on three-phase alternating-current supply UA, UB, UC, the primary coil both ends of line voltage sampling transformer L1 respectively with three-phase alternating current Power supply UA, UC connection, secondary coil one end of line voltage sampling transformer L1 are connect with working power and the one end resistance R2, resistance The R2 other ends are connect with transformer L5 primary coils one end, the secondary coil other end and transformer of line voltage sampling transformer L1 The L5 primary coil other ends are connected with working power, and working power exports DC power supply VCC and VDD, A phase voltages sampling electricity respectively Resistance one end R1A is connect with three phase mains UA, the primary line of the A phase voltages sample resistance R1A other ends and A phase sampling transformers L2A Enclose one end connection, the primary coil other end ground connection of A phase sampling transformers L2A, B phase voltages one end sample resistance R1B and three-phase Power supply UB connections, the B phase voltages sample resistance R1B other ends are connect with primary coil one end of B phase sampling transformers L2B, and B phases take The primary coil other end of sample transformer L2B is grounded, and C phase voltages one end sample resistance R1C is connect with three phase mains UC, C phase electricity The pressure sample resistance R1C other ends are connect with primary coil one end of C phase sampling transformers L2C, and C phase sampling transformers L2C's is first Grade coil other end ground connection, A phase current sampling mutual inductors L3A are arranged on three phase mains UA, A phase current sampling mutual inductors L3A Both ends connect with the both ends A phase sampling transformer L4A and A phase current sampling mutual inductor L3A and A phase sampling transformers L4A one End ground connection, B phase current sampling mutual inductors L3B are arranged on three phase mains UB, and the B phase currents both ends sampling mutual inductor L3B take with B phases The both ends sample transformer L4B connect and one end of B phase current sampling mutual inductor L3B and B phase sampling transformers L4B ground connection, C phase electricity It flows sampling mutual inductor L3C to be arranged on three phase mains UC, the C phase currents both ends sampling mutual inductor L3C and C phase sampling transformers L4C Both ends connect and one end of C phase current sampling mutual inductor L3C and C phase sampling transformers L4B ground connection, transformer L5, A phase sample Transformer L2A, B phase sampling transformer L2B, C phase sampling transformer L2C, A phase sampling transformer L4A, B phase sampling transformer The secondary coil of L4B, C phase sampling transformer L4C are protected with corresponding sampling protection amplitude rectification phase-correcting circuit connection, sampling The output of shield amplitude rectification phase-correcting circuit is connect with intelligent controller, A phase sampling transformer L2A, B phase sampling transformers The corresponding sampling protection amplitude rectification phase-correcting circuits of L2B, C phase sampling transformer L2C and residual voltage sampling and amplitude school Positive circuit connects, and width is protected in the corresponding samplings of A phase sampling transformer L4A, B phase sampling transformer L4B, C phase sampling transformers L4C Value phase calibration correcting circuit is sampled with zero-sequence current and is connect with amplitude rectification circuit, residual voltage sampling and amplitude rectification circuit It samples with zero-sequence current and is connect with intelligent controller with the output of amplitude rectification circuit, circuit-breaker switching on-off driving and transmission parts It is connect respectively with breaker body component S and intelligent controller and breaker body component S break-makes is controlled by intelligent controller.
Further, also comprising GPRS communication components, GPRS communication components are connect with intelligent controller.
Further, the sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1 anodes, resistance R3 The place of working connection of one end, the one end correction base value resistance R4, amplitude rectification one end resistance R5 and working power, protects pressure-sensitive device D1 cathode are connect with the resistance R3 other ends, the one end correction base value resistance R6, the one end phasing capacitor C1, correct base value resistance The R6 other ends are connect with the correction base value resistance R4 other ends, the one end adjustable resistance R7, the adjustable resistance R7 other ends and resistance R8 mono- End connection, the resistance R8 other ends are connect with the phasing capacitor C1 other ends, operational amplifier T1 anodes, amplitude rectification resistance The R5 other ends are connect with operational amplifier T1 cathode, the one end amplitude rectification resistance R9, the amplitude rectification resistance R9 other ends with it is adjustable The one end resistance R10 connects, and the adjustable resistance R10 other ends are connect with operational amplifier T1 output ends, operational amplifier T1 work electricity Pressure both ends are connect with DC power supply VCC and VDD respectively.
Further, the residual voltage, which is sampled with amplitude rectification circuit, is:Residual voltage combined resistance R11, R12, R13 In parallel and residual voltage combined resistance R11, R12, R13 one end and operational amplifier T2 cathode, residual voltage amplitude rectification The one end resistance R14 connects, and the residual voltage amplitude rectification resistance R14 other ends are connect with the one end adjustable resistance R15, adjustable resistance The R15 other ends are connect with operational amplifier T2 output ends and intelligent controller, and operational amplifier T2 anodes connect place of working, and operation is put Big device T2 operating voltages both ends are connect with DC power supply VCC and VDD respectively.
Further, the zero-sequence current, which is sampled with amplitude rectification circuit, is:Zero-sequence current combined resistance R16, R17, R18 In parallel and zero-sequence current combined resistance R16, R17, R18 one end and operational amplifier T3 cathode, zero-sequence current amplitude rectification The one end resistance R19 connects, and the zero-sequence current amplitude rectification resistance R19 other ends are connect with the one end adjustable resistance R20, adjustable resistance The R20 other ends are connect with operational amplifier T3 output ends and intelligent controller, and operational amplifier T3 anodes connect place of working, and operation is put Big device T3 operating currents both ends are connect with DC power supply VCC and VDD respectively.
A kind of control method of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection, it is characterised in that:
Line voltage precisely samples:A, C phases line voltages warp voltage sampling transformer L1 is once depressured again through resistance R2, transformation Bis- decompressions of device L5, in the secondary output of transformer L5, after protecting pressure-sensitive device D1, the limitation protection of resistance R3 overvoltage, Correction base value resistance R6 determines the base value of accuracy correction with the resistance value ratio for correcting base value resistance R4, amplitude rectification resistance R9 with can Resistance R10 and amplitude rectification resistance R5, operational amplifier T1 is adjusted to form a ratio circuit, by adjusting the schools adjustable resistance R10 The amplitude error that main track voltage sampling generates, phasing capacitor C1, adjustable resistance R7, resistance R8 and operational amplifier T1 groups At a differential circuit, the phase error generated by adjusting adjustable resistance R7 compensation line voltage samplings, sampling line voltage is through school Intelligent controller 1 is connected to by operational amplifier T1 outputs after just;
A phase voltages precisely sample:A phase voltages UA is through A phase voltage sample resistances R1A decompressions and A phase sampling transformers L2A electricity Air bound is from rear, after protecting pressure-sensitive device D1B, the limitation protection of resistance R3B overvoltage, correction base value resistance R6B and correction base The resistance value ratio of value resistance R4B determines the base value of accuracy correction, amplitude rectification resistance R9B and adjustable resistance R10B and amplitude rectification Resistance R5B, operational amplifier T1B form a ratio circuit, and phase voltage sampling generation is corrected by adjusting adjustable resistance R10B Amplitude error, phasing capacitor C1B, adjustable resistance R7B, resistance R8B and operational amplifier T1B form a differential electricity Road corrects the phase error that phase voltage sampling generates, by operation after A phase sampling voltages are calibrated by adjusting adjustable resistance R7B Amplifier T1B outputs are connected to intelligent controller 1 and residual voltage combined resistance R11;
The accurate sampling of B phase voltages and the accurate sampling of C phase voltages precisely sample identical with A phase voltages;
A phase currents precisely sample:A phase currents are after stream and electrical isolation once drop in A phase current sampling mutual inductors L3A through A After bis- drop streams of phase sampling transformer L4A and electrical isolation, through protecting pressure-sensitive device D1E, resistance R3E overvoltage to limit protection Afterwards, correction base value resistance R6E determines the base value of accuracy correction, amplitude rectification resistance with the resistance value ratio for correcting base value resistance R4E R9E and adjustable resistance R10E and amplitude rectification resistance R5E, operational amplifier T1E form a ratio circuit, adjustable by adjusting The amplitude error that resistance R10E correction phase current sampling generates, phasing capacitor C1E, adjustable resistance R7E, resistance R8E with Operational amplifier T1E forms a differential circuit, and the phase that phase current sampling generation is corrected by adjusting adjustable resistance R7E is missed Difference is connected to intelligent controller 1 and zero-sequence current combined resistance after A phase sampling currents are calibrated by operational amplifier T1E outputs R16;
The accurate sampling of B phase currents and the accurate sampling of C phase currents precisely sample identical with A phase currents;
Residual voltage precisely samples:A, B, C three-phase voltage are respectively through residual voltage combined resistance R11, R12, R13 in operation The cathode of amplifier T2, which is added, generates residual voltage, through residual voltage amplitude rectification resistance R14, adjustable resistance R15, operation amplifier Intelligent controller 1 is connected to by the output of operational amplifier T2 after the amplitude rectification of device T2 compositions, adjustable resistance R15 is adjusted and changes Output amplitude;
Zero-sequence current precisely samples:A, B, C three-phase current are respectively through zero-sequence current combined resistance R16, R17, R18 in operation The cathode of amplifier T3, which is added, generates zero-sequence current, through zero-sequence current amplitude rectification resistance R19, adjustable resistance R20, operation amplifier Intelligent controller 1 is connected to by the output of operational amplifier T3 after the amplitude rectification of device T3 compositions, adjustable resistance R20 is adjusted and changes Output amplitude;
Ground connection precisely judges:The line voltage analog quantity that intelligent controller 1 exports operational amplifier T1A, operational amplifier The voltage analog of T1B, T1C, T1D output, the phase current analog quantity of operational amplifier T1E, T1F, T1G output, operation amplifier The amplitude and phase of the residual voltage analog quantity of device T2 output and the zero-sequence current analog quantity of operational amplifier T3 outputs are into line number Wordization processing, on the basis of relevant parameter accurately measures, to precisely judge the state of high-tension line according to dependency rule, connect Separate, ground connection the position on ground, property, the situation of ground connection of ground connection.
Further, intelligent process, intelligent controller 1 pass through GPRS communication units on the basis of ground connection precisely judges Part 4 sends out ground state signal, and is driven with transmission parts 2 to breaker body by circuit-breaker switching on-off according to ground state Component S carries out separating brake, is grounded protection.
Compared with prior art, the present invention haing the following advantages and effect:It is simple for structure, reliable for operation, easy to maintain, energy Enough be grounded to power grid precisely judges, so as to correct starting protection or alarm.
Description of the drawings
Fig. 1 is the schematic diagram for the outdoor type high-voltage intelligent circuit breaker of the present invention precisely judged based on ground connection.
Fig. 2 is that amplitude rectification is protected in the sampling for the outdoor type high-voltage intelligent circuit breaker of the present invention precisely judged based on ground connection The circuit diagram of phase-correcting circuit.
Fig. 3 is residual voltage sampling and the width for the outdoor type high-voltage intelligent circuit breaker of the present invention precisely judged based on ground connection It is worth the circuit diagram of correcting circuit.
Fig. 4 is zero-sequence current sampling and the width for the outdoor type high-voltage intelligent circuit breaker of the present invention precisely judged based on ground connection It is worth the circuit diagram of correcting circuit.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is to this hair Bright explanation and the invention is not limited in following embodiments.
As shown, a kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection of the present invention, including open circuit Device body part S, intelligent controller 1, circuit-breaker switching on-off driving and transmission parts 2, working power 3, line voltage sample transformation Device L1, A phase voltage sample resistance R1A, A phase sampling transformer L2A, B phase voltage sample resistance R1B, B phase sampling transformer L2B, C phase voltage sample resistance R1C, C phase sampling transformer L2C, A phase current sampling mutual inductor L3A, A phase sampling transformer L4A, B phases Current sampling mutual inductor L3B, B phase sampling transformer L4B, C phase current sampling mutual inductor L3C, C phase sampling transformer L4C.
Breaker body component S is connected on three-phase alternating-current supply UA, UB, UC, the primary of line voltage sampling transformer L1 Coil both ends are connect with three-phase alternating-current supply UA, UC respectively, secondary coil one end and the work electricity of line voltage sampling transformer L1 Source 3 is connected with the one end resistance R2, and the resistance R2 other ends are connect with transformer L5 primary coils one end, line voltage sampling transformer L1 The secondary coil other end connect with the transformer L5 primary coils other end and working power 3, working power 3 exports direct current respectively Power supply VCC and VDD.
A phase voltages one end sample resistance R1A is connect with three phase mains UA, the A phase voltages sample resistance R1A other ends and A phases Primary coil one end of sampling transformer L2A connects, the primary coil other end ground connection of A phase sampling transformers L2A;B phase voltages The one end sample resistance R1B is connect with three phase mains UB, and the B phase voltages sample resistance R1B other ends are with B phase sampling transformers L2B's Primary coil one end connects, the primary coil other end ground connection of B phase sampling transformers L2B;The one end C phase voltage sample resistance R1C It is connect with three phase mains UC, the C phase voltages sample resistance R1C other ends and primary coil one end of C phase sampling transformers L2C connect It connects, the primary coil other end ground connection of C phase sampling transformers L2C,.
A phase current sampling mutual inductors L3A is arranged on three phase mains UA, the A phase currents both ends sampling mutual inductor L3A and A phases The both ends sampling transformer L4A connect and one end of A phase current sampling mutual inductor L3A and A phase sampling transformers L4A ground connection;B phases Current sampling mutual inductor L3B is arranged on three phase mains UB, the B phase currents both ends sampling mutual inductor L3B and B phase sampling transformers The both ends L4B connect and one end of B phase current sampling mutual inductor L3B and B phase sampling transformers L4B ground connection;The sampling of C phase currents is mutual Sensor L3C is arranged on three phase mains UC, and the C phase currents both ends sampling mutual inductor L3C are connect with the both ends C phase sampling transformer L4C And one end of C phase current sampling mutual inductor L3C and C phase sampling transformers L4B is grounded.
Transformer L5, A phase sampling transformer L2A, B phase sampling transformer L2B, C phase sampling transformer L2C, A phase samples change The secondary coil of depressor L4A, B phase sampling transformer L4B, C phase sampling transformer L4C protects amplitude rectification phase with corresponding sampling Bit correction circuit connects, and the output of sampling protection amplitude rectification phase-correcting circuit is connect with intelligent controller, and A phases sample transformation Amplitude rectification phase-correcting circuit and zero is protected in the corresponding samplings of device L2A, B phase sampling transformer L2B, C phase sampling transformer L2C Sequence voltage sampling is connect with amplitude rectification circuit, A phase sampling transformer L4A, B phase sampling transformer L4B, C phase sampling transformers The corresponding sampling protection amplitude rectification phase-correcting circuits of L4C are sampled with zero-sequence current to be connect with amplitude rectification circuit, zero sequence electricity Pressure sampling is connect with amplitude rectification circuit and zero-sequence current sampling is connect with the output of amplitude rectification circuit with intelligent controller, is broken Road device divide-shut brake driving and transmission parts connect with breaker body component S and intelligent controller controlled by intelligent controller respectively Breaker body component S break-makes.
The outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection also includes GPRS communication components, GPRS communication components It is connect with intelligent controller.
Sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1 anodes, the one end resistance R3, correction base value The place of working of the one end resistance R4, amplitude rectification one end resistance R5 and working power connects, and protects pressure-sensitive device D1 cathode and resistance The R3 other ends, the one end correction base value resistance R6, the connection of the one end phasing capacitor C1, correct the base value resistance R6 other ends and school The positive base value resistance R4 other ends, the connection of the one end adjustable resistance R7, the adjustable resistance R7 other ends are connect with the one end resistance R8, resistance R8 The other end is connect with the phasing capacitor C1 other ends, operational amplifier T1 anodes, the amplitude rectification resistance R5 other ends and fortune Amplifier T1 cathode, the connection of the one end amplitude rectification resistance R9 are calculated, the amplitude rectification resistance R9 other ends connect with the one end adjustable resistance R10 Connect, the adjustable resistance R10 other ends are connect with operational amplifier T1 output ends, operational amplifier T1 operating voltages both ends respectively with directly Galvanic electricity source VCC is connected with VDD.
Residual voltage is sampled with amplitude rectification circuit:Residual voltage combined resistance R11, R12, R13 parallel connection and zero sequence One end of voltage combined resistance R11, R12, R13 and operational amplifier T2 cathode, the one end residual voltage amplitude rectification resistance R14 connect It connects, the residual voltage amplitude rectification resistance R14 other ends are connect with the one end adjustable resistance R15, the adjustable resistance R15 other ends and operation Amplifier T2 output ends are connected with intelligent controller, and operational amplifier T2 anodes connect place of working, operational amplifier T2 operating voltages Both ends are connect with DC power supply VCC and VDD respectively.
Zero-sequence current is sampled with amplitude rectification circuit:Zero-sequence current combined resistance R16, R17, R18 parallel connection and zero sequence One end of electric current combined resistance R16, R17, R18 and operational amplifier T3 cathode, the one end zero-sequence current amplitude rectification resistance R19 connect It connects, the zero-sequence current amplitude rectification resistance R19 other ends are connect with the one end adjustable resistance R20, the adjustable resistance R20 other ends and operation Amplifier T3 output ends are connected with intelligent controller, and operational amplifier T3 anodes connect place of working, operational amplifier T3 operating currents Both ends are connect with DC power supply VCC and VDD respectively.
In particular:
Corresponding with transformer L5 sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1A anodes, electricity The place of working for hindering the one end R3A, the one end correction base value resistance R4A, amplitude rectification one end resistance R5A and working power connects, protection Pressure-sensitive device D1A cathode are connect with the resistance R3A other ends, the one end correction base value resistance R6A, the one end phasing capacitor C1A, The correction base value resistance R6A other ends are connect with the correction base value resistance R4A other ends, the one end adjustable resistance R7A, adjustable resistance R7A The other end is connect with the one end resistance R8A, the resistance R8A other ends and the phasing capacitor C1A other ends, operational amplifier T1A Anode connection, the amplitude rectification resistance R5A other ends are connect with operational amplifier T1A cathode, the one end amplitude rectification resistance R9A, width The value correction resistance R9A other ends are connect with the one end adjustable resistance R10A, and the adjustable resistance R10A other ends and operational amplifier T1A are defeated Outlet connects, and operational amplifier T1A operating voltages both ends are connect with DC power supply VCC and VDD respectively.The secondary wire of transformer L5 Circle is connect with the positive and negative anodes of protection pressure-sensitive device D1A respectively.The output end of the adjustable resistance R10A other ends and operational amplifier T1A It is connect with intelligent controller 1.
Corresponding with A phase sampling transformer L2A sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1B anodes, the one end resistance R3B, the place of working for correcting the one end base value resistance R4B, the amplitude rectification one end resistance R5B and working power Connection, protection pressure-sensitive device D1B cathode and the resistance R3B other ends, the one end correction base value resistance R6B, phasing capacitor C1B One end connects, and the correction base value resistance R6B other ends are connect with the correction base value resistance R4B other ends, the one end adjustable resistance R7B, can The resistance R7B other ends are adjusted to be connect with the one end resistance R8B, the resistance R8B other ends and the phasing capacitor C1B other ends, operation Amplifier T1B anodes connect, the amplitude rectification resistance R5B other ends and operational amplifier T1B cathode, amplitude rectification resistance R9B mono- End connection, the amplitude rectification resistance R9B other ends are connect with the one end adjustable resistance R10B, and the adjustable resistance R10B other ends are put with operation Big device T1B output ends connection, operational amplifier T1B operating voltages both ends are connect with DC power supply VCC and VDD respectively.A phases sample The secondary coil both ends of transformer L2A are connect with the positive and negative anodes of protection pressure-sensitive device D1B respectively.The adjustable resistance R10B other ends and The output end of operational amplifier T1B is connect with the other end of intelligent controller 1 and residual voltage combined resistance R11.
Corresponding with B phase sampling transformer L2B sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1C anodes, the one end resistance R3C, the place of working for correcting the one end base value resistance R4C, the amplitude rectification one end resistance R5C and working power Connection, protection pressure-sensitive device D1C cathode and the resistance R3C other ends, the one end correction base value resistance R6C, phasing capacitor C1C One end connects, and the correction base value resistance R6C other ends are connect with the correction base value resistance R4C other ends, the one end adjustable resistance R7C, can The resistance R7C other ends are adjusted to be connect with the one end resistance R8C, the resistance R8C other ends and the phasing capacitor C1C other ends, operation Amplifier T1C anodes connect, the amplitude rectification resistance R5C other ends and operational amplifier T1C cathode, amplitude rectification resistance R9C mono- End connection, the amplitude rectification resistance R9C other ends are connect with the one end adjustable resistance R10C, and the adjustable resistance R10C other ends are put with operation Big device T1C output ends connection, operational amplifier T1C operating voltages both ends are connect with DC power supply VCC and VDD respectively.B phases sample The secondary coil both ends of transformer L2B are connect with the positive and negative anodes of protection pressure-sensitive device D1C respectively.The adjustable resistance R10C other ends and The output end of operational amplifier T1C is connect with the other end of intelligent controller 1 and residual voltage combined resistance R12.
Corresponding with C phase sampling transformer L2C sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1D anodes, the one end resistance R3D, the place of working for correcting the one end base value resistance R4D, the amplitude rectification one end resistance R5D and working power Connection, protection pressure-sensitive device D1D cathode and the resistance R3D other ends, the one end correction base value resistance R6D, phasing capacitor C1D One end connects, and the correction base value resistance R6D other ends are connect with the correction base value resistance R4D other ends, the one end adjustable resistance R7D, can The resistance R7D other ends are adjusted to be connect with the one end resistance R8D, the resistance R8D other ends and the phasing capacitor C1D other ends, operation Amplifier T1D anodes connect, the amplitude rectification resistance R5D other ends and operational amplifier T1D cathode, amplitude rectification resistance R9D mono- End connection, the amplitude rectification resistance R9D other ends are connect with the one end adjustable resistance R10D, and the adjustable resistance R10D other ends are put with operation Big device T1D output ends connection, operational amplifier T1D operating voltages both ends are connect with DC power supply VCC and VDD respectively.C phases sample The secondary coil both ends of transformer L2C are connect with the positive and negative anodes of protection pressure-sensitive device D1D respectively.The adjustable resistance R10D other ends and The output end of operational amplifier T1D is connect with the other end of intelligent controller 1 and residual voltage combined resistance R13.
Corresponding with A phase sampling transformer L4A sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1E anodes, the one end resistance R3E, the place of working for correcting the one end base value resistance R4E, the amplitude rectification one end resistance R5E and working power Connection, protection pressure-sensitive device D1E cathode and the resistance R3E other ends, the one end correction base value resistance R6E, phasing capacitor C1E One end connects, and the correction base value resistance R6E other ends are connect with the correction base value resistance R4E other ends, the one end adjustable resistance R7E, can The resistance R7E other ends are adjusted to be connect with the one end resistance R8E, the resistance R8E other ends and the phasing capacitor C1E other ends, operation Amplifier T1E anodes connect, the amplitude rectification resistance R5E other ends and operational amplifier T1E cathode, amplitude rectification resistance R9E mono- End connection, the amplitude rectification resistance R9E other ends are connect with the one end adjustable resistance R10E, and the adjustable resistance R10E other ends are put with operation Big device T1E output ends connection, operational amplifier T1E operating voltages both ends are connect with DC power supply VCC and VDD respectively.A phases sample The secondary coil both ends of transformer L4A are connect with the positive and negative anodes of protection pressure-sensitive device D1E respectively.The adjustable resistance R10E other ends and The output end of operational amplifier T1E is connect with the other end of intelligent controller 1 and residual voltage combined resistance R16.
Corresponding with B phase sampling transformer L4B sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1F anodes, the one end resistance R3F, the place of working for correcting the one end base value resistance R4F, the amplitude rectification one end resistance R5F and working power Connection, protection pressure-sensitive device D1F cathode and the resistance R3F other ends, the one end correction base value resistance R6F, phasing capacitor C1F One end connects, and the correction base value resistance R6F other ends are connect with the correction base value resistance R4F other ends, the one end adjustable resistance R7F, can The resistance R7F other ends are adjusted to be connect with the one end resistance R8F, the resistance R8F other ends and the phasing capacitor C1F other ends, operation Amplifier T1F anodes connect, the amplitude rectification resistance R5F other ends and operational amplifier T1F cathode, amplitude rectification resistance R9F mono- End connection, the amplitude rectification resistance R9F other ends are connect with the one end adjustable resistance R10F, and the adjustable resistance R10F other ends are put with operation Big device T1F output ends connection, operational amplifier T1F operating voltages both ends are connect with DC power supply VCC and VDD respectively.B phases sample The secondary coil both ends of transformer L4B are connect with the positive and negative anodes of protection pressure-sensitive device D1F respectively.The adjustable resistance R10F other ends and The output end of operational amplifier T1F is connect with the other end of intelligent controller 1 and residual voltage combined resistance R17.
Corresponding with C phase sampling transformer L4C sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1G anodes, the one end resistance R3G, the place of working for correcting the one end base value resistance R4G, the amplitude rectification one end resistance R5G and working power Connection, protection pressure-sensitive device D1G cathode and the resistance R3G other ends, the one end correction base value resistance R6G, phasing capacitor C1G One end connects, and the correction base value resistance R6G other ends are connect with the correction base value resistance R4G other ends, the one end adjustable resistance R7G, can The resistance R7G other ends are adjusted to be connect with the one end resistance R8G, the resistance R8G other ends and the phasing capacitor C1G other ends, operation Amplifier T1G anodes connect, the amplitude rectification resistance R5G other ends and operational amplifier T1G cathode, amplitude rectification resistance R9G mono- End connection, the amplitude rectification resistance R9G other ends are connect with the one end adjustable resistance R10G, and the adjustable resistance R10G other ends are put with operation Big device T1G output ends connection, operational amplifier T1G operating voltages both ends are connect with DC power supply VCC and VDD respectively.C phases sample The secondary coil both ends of transformer L4C are connect with the positive and negative anodes of protection pressure-sensitive device D1G respectively.The adjustable resistance R10G other ends and The output end of operational amplifier T1G is connect with the other end of intelligent controller 1 and residual voltage combined resistance R18.
The accurate sampling theorem of line voltage:A, C phases line voltages warp voltage sampling transformer L1 once decompression again through resistance R2, Bis- decompressions of transformer L5, in the secondary output of transformer L5, through protecting pressure-sensitive device D1, resistance R3 overvoltage to limit protection Afterwards, correction base value resistance R6 determines the base value of accuracy correction, amplitude rectification resistance R9 with the resistance value ratio for correcting base value resistance R4 A ratio circuit is formed with adjustable resistance R10 and amplitude rectification resistance R5, operational amplifier T1, by adjusting adjustable resistance The amplitude error that R10 compensation line voltage samplings generate.Phasing capacitor C1, adjustable resistance R7, resistance R8 and operation amplifier Device T1 forms a differential circuit, the phase error generated by adjusting adjustable resistance R7 compensation line voltage samplings.Sample line electricity Press it is calibrated after intelligent controller 1 is connected to by operational amplifier T1 output.
The accurate sampling theorem of phase voltage:A phase voltages UA is through A phase voltage sample resistances R1A decompressions and A phase sampling transformers L2A electrical isolations(B phase voltages UB is through B phase voltage sample resistances R1B decompressions and B phase sampling transformer L2B electrical isolations, C phase electricity Press UC through C phase voltage sample resistances R1C decompressions and C phase sampling transformer L2C electrical isolations)Afterwards, through protect pressure-sensitive device D1B, After the limitation protection of resistance R3B overvoltage, correction base value resistance R6B determines precision with the resistance value ratio for correcting base value resistance R4B The base value of correction, amplitude rectification resistance R9B and adjustable resistance R10B and amplitude rectification resistance R5B, operational amplifier T1B compositions one A ratio circuit corrects the amplitude error that phase voltage sampling generates by adjusting adjustable resistance R10B.Phasing capacitor C1B, adjustable resistance R7B, resistance R8B and operational amplifier T1B form a differential circuit, by adjusting the schools adjustable resistance R7B The phase error that positive voltage sampling generates.Intelligent control is connected to by operational amplifier T1B outputs after A phase sampling voltages are calibrated Device 1 and residual voltage combined resistance R11 processed(Intelligent control is connected to by operational amplifier T1B outputs after B phase sampling voltages are calibrated Intelligent control is connected to by operational amplifier T1B outputs after device 1 and residual voltage combined resistance R12, C phase sampling voltage processed is calibrated Device 1 and residual voltage combined resistance R13 processed).
The accurate sampling theorem of phase current:A phase currents are after stream and electrical isolation once drop in A phase current sampling mutual inductors L3A Through bis- drop streams of A phase sampling transformers L4A and electrical isolation(B phase currents through B phase current sampling mutual inductors L3B once drop stream and Through bis- drop streams of B phase sampling transformers L4B and electrical isolation after electrical isolation, C phase currents are through C phase current sampling mutual inductors L3C Through bis- drop streams of C phase sampling transformers L4C and electrical isolation after primary drop stream and electrical isolation)Afterwards, through protecting pressure-sensitive device After D1E, the limitation protection of resistance R3E overvoltage, correction base value resistance R6E is determined with the resistance value ratio for correcting base value resistance R4E The base value of accuracy correction, amplitude rectification resistance R9E and adjustable resistance R10E and amplitude rectification resistance R5E, operational amplifier T1E groups At a ratio circuit, the amplitude error that phase current sampling generates is corrected by adjusting adjustable resistance R10E.Phasing capacitance Device C1E, adjustable resistance R7E, resistance R8E and operational amplifier T1E form a differential circuit, by adjusting adjustable resistance R7E Correct the phase error that phase current sampling generates.Intelligence is connected to by operational amplifier T1E outputs after A phase sampling currents are calibrated Controller 1 and residual voltage combined resistance R16(Intelligence is connected to by operational amplifier T1E outputs after B phase sampling currents are calibrated Intelligence is connected to by operational amplifier T1E outputs after controller 1 and residual voltage combined resistance R17, C phase sampling current are calibrated Controller 1 and residual voltage combined resistance R18).
The accurate sampling theorem of residual voltage:A, B, C three-phase voltage exist through residual voltage combined resistance R11, R12, R13 respectively The cathode of operational amplifier T2, which is added, generates residual voltage, through residual voltage amplitude rectification resistance R14, adjustable resistance R15, operation Intelligent controller 1 is connected to by the output of operational amplifier T2 after the amplitude rectification of amplifier T2 compositions, adjusts adjustable resistance R15 Change output amplitude.
The accurate sampling theorem of zero-sequence current:A, B, C three-phase current exist through zero-sequence current combined resistance R16, R17, R18 respectively The cathode of operational amplifier T3, which is added, generates zero-sequence current, through zero-sequence current amplitude rectification resistance R19, adjustable resistance R20, operation Intelligent controller 1 is connected to by the output of operational amplifier T3 after the amplitude rectification of amplifier T3 compositions, adjusts adjustable resistance R20 Change output amplitude.
Ground connection precisely judges principle:The line voltage analog quantity that intelligent controller 1 exports operational amplifier T1A, operation are put The voltage analog of big device T1B, T1C, T1D output, the phase current analog quantity of operational amplifier T1E, T1F, T1G output, operation The amplitude and phase of the residual voltage analog quantity of amplifier T2 output and the zero-sequence current analog quantity of operational amplifier T3 outputs into Digitized processing, on the basis of relevant parameter accurately measures, to precisely judge the shape of high-tension line according to dependency rule State(Ground connection/earth-free), ground connection it is separate(A phases/B phases/C phases), ground connection position(Mains side/load-side), ground connection property (Metallic earthing/arc light ground connection), ground connection situation(Earth current size and arc light grounding surge situation).
Intelligent principle:Intelligent controller 1 is sent out by GPRS communication components 4 and is connect on the basis of ground connection precisely judges Ground status signal, and breaker body component S is carried out by circuit-breaker switching on-off driving and transmission parts 2 according to ground state Separating brake is grounded protection.Intelligent controller 1 passes through breaker on the basis of gathering line voltage, phase voltage, phase current Divide-shut brake drives and transmission parts 2, GPRS communication components 4, realizes that measurement, control, protection, signal, telemechanical, self diagnosis etc. are comprehensive Automation(Or it is intelligent)Function, as with automatic circuit, boundary device etc. in electricity consumption Automation System of Power Network.
Described in this specification above content is only illustrations made for the present invention.Technology belonging to the present invention The technical staff in field can do various modifications or supplement to described specific embodiment or substitute by a similar method, only The guarantor of the present invention should all be belonged to without departing from the content or beyond the scope defined by this claim of description of the invention Protect range.

Claims (7)

1. a kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection, it is characterised in that:Including breaker body portion Part S, intelligent controller, circuit-breaker switching on-off driving and transmission parts, working power, line voltage sampling transformer L1, A phase voltage Sample resistance R1A, A phase sampling transformer L2A, B phase voltage sample resistance R1B, B phase sampling transformer L2B, C phase voltage samples The sampling of resistance R1C, C phase sampling transformer L2C, A phase current sampling mutual inductor L3A, A phase sampling transformer L4A, B phase current is mutual Sensor L3B, B phase sampling transformer L4B, C phase current sampling mutual inductor L3C, C phase sampling transformer L4C, breaker body component Be connected on three-phase alternating-current supply UA, UB, UC, the primary coil both ends of line voltage sampling transformer L1 respectively with three-phase alternating current Source UA, UC connection, secondary coil one end of line voltage sampling transformer L1 are connect with working power and the one end resistance R2, resistance R2 The other end is connect with transformer L5 primary coils one end, the secondary coil other end and the transformer L5 of line voltage sampling transformer L1 The primary coil other end is connected with working power, and working power exports DC power supply VCC and VDD, A phase voltage sample resistances respectively The one end R1A is connect with three phase mains UA, the primary coil of the A phase voltages sample resistance R1A other ends and A phase sampling transformers L2A One end connects, the primary coil other end ground connection of A phase sampling transformers L2A, B phase voltages one end sample resistance R1B and three-phase electricity Source UB connections, the B phase voltages sample resistance R1B other ends are connect with primary coil one end of B phase sampling transformers L2B, and B phases sample The primary coil other end of transformer L2B is grounded, and C phase voltages one end sample resistance R1C is connect with three phase mains UC, C phase voltages The sample resistance R1C other ends are connect with primary coil one end of C phase sampling transformers L2C, the primary of C phase sampling transformers L2C The coil other end is grounded, and A phase current sampling mutual inductors L3A is arranged on three phase mains UA, A phase current sampling mutual inductors L3A two End is connect with the both ends A phase sampling transformer L4A and one end of A phase current sampling mutual inductor L3A and A phase sampling transformers L4A Ground connection, B phase current sampling mutual inductors L3B are arranged on three phase mains UB, and the B phase currents both ends sampling mutual inductor L3B are sampled with B phases The both ends transformer L4B connect and one end of B phase current sampling mutual inductor L3B and B phase sampling transformers L4B ground connection, C phase currents Sampling mutual inductor L3C is arranged on three phase mains UC, the C phase currents both ends sampling mutual inductor L3C and C phase sampling transformers L4C two One end ground connection of end connection and C phase current sampling mutual inductor L3C and C phase sampling transformers L4B, transformer L5, A phase sample change Depressor L2A, B phase sampling transformer L2B, C phase sampling transformer L2C, A phase sampling transformer L4A, B phase sampling transformer L4B, C The secondary coil of phase sampling transformer L4C and corresponding sampling protection amplitude rectification phase-correcting circuit connection, sampling protection width The output of value phase calibration correcting circuit is connect with intelligent controller, A phase sampling transformer L2A, B phase sampling transformers L2B, C The corresponding sampling protection amplitude rectification phase-correcting circuits of phase sampling transformer L2C and residual voltage sampling and amplitude rectification circuit Amplitude rectification is protected in connection, the corresponding samplings of A phase sampling transformer L4A, B phase sampling transformer L4B, C phase sampling transformers L4C Phase-correcting circuit is sampled with zero-sequence current and is connect with amplitude rectification circuit, residual voltage sampling and amplitude rectification circuit and zero sequence Current sampling is connect with the output of amplitude rectification circuit with intelligent controller, circuit-breaker switching on-off driving and transmission parts respectively with Breaker body component S is connected with intelligent controller controls breaker body component S break-makes by intelligent controller.
2. the outdoor type high-voltage intelligent circuit breaker described in accordance with the claim 1 precisely judged based on ground connection, it is characterised in that:Also Including GPRS communication components, GPRS communication components are connect with intelligent controller.
3. the outdoor type high-voltage intelligent circuit breaker described in accordance with the claim 1 precisely judged based on ground connection, it is characterised in that:Institute Stating sampling protection amplitude rectification phase-correcting circuit is:Protect pressure-sensitive device D1 anodes, the one end resistance R3, correction base value resistance R4 The place of working of one end, amplitude rectification one end resistance R5 and working power connects, and protects pressure-sensitive device D1 cathode and resistance R3 another End, the one end correction base value resistance R6, the connection of the one end phasing capacitor C1, the correction base value resistance R6 other ends and correction base value The resistance R4 other ends, the connection of the one end adjustable resistance R7, the adjustable resistance R7 other ends are connect with the one end resistance R8, the resistance R8 other ends It is connect with the phasing capacitor C1 other ends, operational amplifier T1 anodes, the amplitude rectification resistance R5 other ends and operation amplifier Device T1 cathode, the connection of the one end amplitude rectification resistance R9, the amplitude rectification resistance R9 other ends are connect with the one end adjustable resistance R10, can Adjust the resistance R10 other ends connect with operational amplifier T1 output ends, operational amplifier T1 operating voltages both ends respectively with direct current Source VCC is connected with VDD.
4. the outdoor type high-voltage intelligent circuit breaker described in accordance with the claim 1 precisely judged based on ground connection, it is characterised in that:Institute State residual voltage sampling is with amplitude rectification circuit:Residual voltage combined resistance R11, R12, R13 are in parallel and residual voltage closes It is connect with operational amplifier T2 cathode, the one end residual voltage amplitude rectification resistance R14 at one end of resistance R11, R12, R13, zero The sequence voltage amplitude rectification resistance R14 other ends are connect with the one end adjustable resistance R15, the adjustable resistance R15 other ends and operation amplifier Device T2 output ends are connected with intelligent controller, and operational amplifier T2 anodes connect place of working, operational amplifier T2 operating voltages both ends It is connect respectively with DC power supply VCC and VDD.
5. the outdoor type high-voltage intelligent circuit breaker described in accordance with the claim 1 precisely judged based on ground connection, it is characterised in that:Institute State zero-sequence current sampling is with amplitude rectification circuit:Zero-sequence current combined resistance R16, R17, R18 are in parallel and zero-sequence current closes It is connect with operational amplifier T3 cathode, the one end zero-sequence current amplitude rectification resistance R19 at one end of resistance R16, R17, R18, zero The sequence current amplitude correction resistance R19 other ends are connect with the one end adjustable resistance R20, the adjustable resistance R20 other ends and operation amplifier Device T3 output ends are connected with intelligent controller, and operational amplifier T3 anodes connect place of working, operational amplifier T3 operating currents both ends It is connect respectively with DC power supply VCC and VDD.
6. a kind of control method of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection, it is characterised in that:
Line voltage precisely samples:A, C phases line voltages warp voltage sampling transformer L1 is once depressured again through resistance R2, transformer L5 Secondary decompression, in the secondary output of transformer L5, after protecting pressure-sensitive device D1, the limitation protection of resistance R3 overvoltage, correction The resistance value ratio of base value resistance R6 and correction base value resistance R4 determines the base value of accuracy correction, amplitude rectification resistance R9 and adjustable electric R10 and amplitude rectification resistance R5, operational amplifier T1 one ratio circuit of composition are hindered, passes through and adjusts adjustable resistance R10 compensation lines The amplitude error that voltage sampling generates, phasing capacitor C1, adjustable resistance R7, resistance R8 and operational amplifier T1 compositions one A differential circuit, the phase error generated by adjusting adjustable resistance R7 compensation line voltage samplings, after sampling line voltage is calibrated Intelligent controller 1 is connected to by operational amplifier T1 outputs;
A phase voltages precisely sample:A phase voltages UA through A phase voltage sample resistances R1A decompression and A phase sampling transformers L2A electrically every From rear, after protecting pressure-sensitive device D1B, the limitation protection of resistance R3B overvoltage, correction base value resistance R6B and correction base value electricity The resistance value ratio of resistance R4B determines the base value of accuracy correction, amplitude rectification resistance R9B and adjustable resistance R10B and amplitude rectification resistance R5B, operational amplifier T1B form a ratio circuit, the width generated by adjusting adjustable resistance R10B compensation line voltage samplings It is worth error, phasing capacitor C1B, adjustable resistance R7B, resistance R8B and operational amplifier T1B form a differential circuit, The phase error that phase voltage sampling generates is corrected by adjusting adjustable resistance R7B, by operation amplifier after A phase sampling voltages are calibrated Device T1B outputs are connected to intelligent controller 1 and residual voltage combined resistance R11;
The accurate sampling of B phase voltages and the accurate sampling of C phase voltages precisely sample identical with A phase voltages;
A phase currents precisely sample:A phase currents once drop stream through A phase current sampling mutual inductors L3A and are taken through A phases with after electrical isolation After bis- drop streams of sample transformer L4A and electrical isolation, after protecting pressure-sensitive device D1E, the limitation protection of resistance R3E overvoltage, Correction base value resistance R6E determines the base value of accuracy correction, amplitude rectification resistance R9E with the resistance value ratio for correcting base value resistance R4E A ratio circuit is formed with adjustable resistance R10E and amplitude rectification resistance R5E, operational amplifier T1E, by adjusting adjustable electric Hinder the amplitude error that R10E correction phase current samplings generate, phasing capacitor C1E, adjustable resistance R7E, resistance R8E and fortune It calculates amplifier T1E and forms a differential circuit, the phase error that phase current sampling generates, A are corrected by adjusting adjustable resistance R7E Intelligent controller 1 and zero-sequence current combined resistance R16 are connected to by operational amplifier T1E outputs after phase sampling current is calibrated;
The accurate sampling of B phase currents and the accurate sampling of C phase currents precisely sample identical with A phase currents;
Residual voltage precisely samples:A, B, C three-phase voltage are respectively through residual voltage combined resistance R11, R12, R13 in operation amplifier The cathode of device T2, which is added, generates residual voltage, through residual voltage amplitude rectification resistance R14, adjustable resistance R15, operational amplifier T2 Intelligent controller 1 is connected to by the output of operational amplifier T2 after the amplitude rectification of composition, adjustable resistance R15 is adjusted and changes output Amplitude;
Zero-sequence current precisely samples:A, B, C three-phase current are respectively through zero-sequence current combined resistance R16, R17, R18 in operation amplifier The cathode of device T3, which is added, generates zero-sequence current, through zero-sequence current amplitude rectification resistance R19, adjustable resistance R20, operational amplifier T3 Intelligent controller 1 is connected to by the output of operational amplifier T3 after the amplitude rectification of composition, adjustable resistance R20 is adjusted and changes output Amplitude;
Ground connection precisely judges:The line voltage analog quantity that intelligent controller 1 exports operational amplifier T1A, operational amplifier T1B, The voltage analog of T1C, T1D output, the phase current analog quantity of operational amplifier T1E, T1F, T1G output, operational amplifier T2 The amplitude and phase of the residual voltage analog quantity of output and the zero-sequence current analog quantity of operational amplifier T3 outputs are digitized Processing, on the basis of relevant parameter accurately measures, to precisely judged according to dependency rule high-tension line state, be grounded It is separate, ground connection position, ground connection property, the situation of ground connection.
7. a kind of controlling party of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection according to claim 6 Method, it is characterised in that:Intelligent process, intelligent controller 1 pass through GPRS communication components 4 on the basis of ground connection precisely judges Ground state signal is sent out, and is driven with transmission parts 2 to breaker body portion by circuit-breaker switching on-off according to ground state Part S carries out separating brake, is grounded protection.
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CN107015120B (en) * 2017-05-22 2019-08-13 江苏现代电力科技股份有限公司 A kind of ground connection is accurate to judge pilot system
CN107565512A (en) * 2017-10-17 2018-01-09 国网江苏省电力公司南通供电公司 Outdoor type high-voltage intelligent circuit breaker
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