CN105954675A - Outdoor high-voltage intelligent circuit breaker based on accurate grounding judgment and control method thereof - Google Patents
Outdoor high-voltage intelligent circuit breaker based on accurate grounding judgment and control method thereof Download PDFInfo
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- CN105954675A CN105954675A CN201610557760.1A CN201610557760A CN105954675A CN 105954675 A CN105954675 A CN 105954675A CN 201610557760 A CN201610557760 A CN 201610557760A CN 105954675 A CN105954675 A CN 105954675A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an outdoor high-voltage intelligent circuit breaker based on accurate grounding judgment and a control method thereof. The outdoor high-voltage intelligent circuit breaker comprises a circuit breaker body component S, an intelligent controller, a circuit breaker closing/opening driving and transmission component, a working power supply, a line voltage sampling transformer L1, an A phase voltage sampling resistor R1A, an A phase sampling transformer L2A, a B phase voltage sampling resistor R1B, a B phase sampling transformer L2B, a C phase voltage sampling resistor R1C, a C phase sampling transformer L2C, an A phase current sampling transformer L3A, an A phase sampling transformer L4A, a B phase current sampling transformer L3B, a B phase sampling transformer L4B, a C phase current sampling transformer L3C, and a C phase sampling transformer L4C. The outdoor high-voltage intelligent circuit breaker can realize accurate grounding judgment of a power grid, and thus protection or alarm can be started accurately.
Description
Technical field
The present invention relates to a kind of intelligent breaker and control method, a kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection and control method thereof.
Background technology
Outdoor type primary cut-out is used widely, as the important basic equipment of high voltage power distribution Yu electricity consumption, it is ensured that the safety and economic operation of electrical network in for electricity consumption electrical network.In recent years; outdoor type primary cut-out develops to intelligent direction; once switch, current transformer, voltage transformer etc. combine with secondary automation equipment; become outdoor type high-voltage intelligent circuit breaker; have measurement, control, protect, signal, motion, comprehensive automation (or intelligent) function such as self diagnosis, as the automatic circuit in adapted electricity Automation System of Power Network, boundary device etc..
Existing outdoor type high-voltage intelligent circuit breaker has electric current speed and cuts, crosses the defencive function that stream, overload, overvoltage, under-voltage, ground connection etc. are the most complete, to ensure power grid security, economical operation.Its major defect is that protection, the warning implemented according to ground connection judgement is the most accurate; namely actual ground connection does not monitor and does not has ground connection to be judged as ground connection with actual; result compromises the safety of electrical network, economical operation, and then affects the normal production of vast electricity consumer, life.
Lack in the market and a kind of electrical network ground connection precisely can be judged such that it is able to correct starting protection or warning and outdoor type high-voltage intelligent circuit breaker simple for structure, reliable, easy to maintenance.
Summary of the invention
The technical problem to be solved is to provide a kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection and control method thereof, and electrical network ground connection can precisely be judged by it such that it is able to correct starting protection or warning.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
nullA kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection，It is characterized in that: comprise breaker body parts S、Intelligent controller、Circuit-breaker switching on-off drives and drive disk assembly、Working power and 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 sample resistance R1C、C phase sampling transformer L2C、A phase current sampling mutual inductor L3A、A phase sampling transformer L4A、B phase current sampling mutual inductor L3B、B phase sampling transformer L4B、C phase current sampling mutual inductor L3C、C phase sampling transformer L4C，Breaker body parts are connected to three-phase alternating-current supply UA、UB、On UC，The primary coil two ends of working power and line voltage sampling transformer L1 respectively with three-phase alternating-current supply UA、UC connects，Secondary coil one end of working power and line voltage sampling transformer L1 is connected with working power and resistance R2 one end，The resistance R2 other end is connected with transformator L5 primary coil one end，The secondary coil other end of working power and line voltage sampling transformer L1 is connected with the transformator L5 primary coil other end and working power，Working power exports DC source VCC and VDD respectively，A phase voltage sample resistance R1A one end is connected with three phase mains UA，The A phase voltage sample resistance R1A other end is connected with primary coil one end of A phase sampling transformer L2A，The primary coil other end ground connection of A phase sampling transformer L2A，B phase voltage sample resistance R1B one end is connected with three phase mains UB，The B phase voltage sample resistance R1B other end is connected with primary coil one end of B phase sampling transformer L2B，The primary coil other end ground connection of B phase sampling transformer L2B,C phase voltage sample resistance R1C one end is connected with three phase mains UC，The C phase voltage sample resistance R1C other end is connected with primary coil one end of C phase sampling transformer L2C，The primary coil other end ground connection of C phase sampling transformer L2C,A phase current sampling mutual inductor L3A is arranged on three phase mains UA，A phase current sampling mutual inductor L3A two ends are connected with A phase sampling transformer L4A two ends and A phase current sampling mutual inductor L3A and one end ground connection of A phase sampling transformer L4A，B phase current sampling mutual inductor L3B is arranged on three phase mains UB，B phase current sampling mutual inductor L3B two ends are connected with B phase sampling transformer L4B two ends and B phase current sampling mutual inductor L3B and one end ground connection of B phase sampling transformer L4B，C phase current sampling mutual inductor L3C is arranged on three phase mains UC，C phase current sampling mutual inductor L3C two ends are connected with C phase sampling transformer L4C two ends and C phase current sampling mutual inductor L3C and one end ground connection of C phase sampling transformer L4B，Transformator L5、A phase sampling transformer L2A、B phase sampling transformer L2B、C phase sampling transformer L2C、A phase sampling transformer L4A、B phase sampling transformer L4B、The secondary coil of C phase sampling transformer L4C connects with corresponding sampling protection amplitude rectification phase-correcting circuit，Sampling protection amplitude rectification phase-correcting circuit connects output and is connected with intelligent controller，A phase sampling transformer L2A、B phase sampling transformer L2B、Sampling protection amplitude rectification phase-correcting circuit corresponding for C phase sampling transformer L2C is connected with amplitude rectification circuit with residual voltage sampling，A phase sampling transformer L4A、B phase sampling transformer L4B、Sampling protection amplitude rectification phase-correcting circuit corresponding for C phase sampling transformer L4C is connected with amplitude rectification circuit with zero-sequence current sampling，Residual voltage sampling is connected with amplitude rectification circuit and zero-sequence current sampling is connected output and is connected with intelligent controller with amplitude rectification circuit，Circuit-breaker switching on-off drives and drive disk assembly is connected with breaker body parts S and intelligent controller respectively by intelligent controller control breaker body parts S break-make.
Further, also comprising GPRS communication component, GPRS communication component is connected with intelligent controller.
nullFurther，Described sampling protection amplitude rectification phase-correcting circuit is，Protection pressure-sensitive device D1 positive pole、Resistance R3 one end、Correction base value resistance R4 one end、Amplitude rectification resistance R5 one end is connected with the place of working of working power，Protection pressure-sensitive device D1 negative pole and the resistance R3 other end、Correction base value resistance R6 one end、Phasing capacitor C1 one end connects，The correction base value resistance R6 other end and the correction base value resistance R4 other end、Adjustable resistance R7 one end connects，The adjustable resistance R7 other end is connected with resistance R8 one end，The resistance R8 other end and the phasing capacitor C1 other end、Operational amplifier T1 positive pole connects，The amplitude rectification resistance R5 other end and operational amplifier T1 negative pole、Amplitude rectification resistance R9 one end connects，The amplitude rectification resistance R9 other end is connected with adjustable resistance R10 one end，The adjustable resistance R10 other end is connected with operational amplifier T1 outfan，Operational amplifier T1 running voltage two ends are connected with DC source VCC and VDD respectively.
Further, the sampling of described residual voltage with amplitude rectification circuit is, residual voltage combined resistance R11, R12, R13 parallel connection and residual voltage combined resistance R11, R12, one end of R13 and operational amplifier T2 negative pole, residual voltage amplitude rectification resistance R14 one end connects, the residual voltage amplitude rectification resistance R14 other end is connected with adjustable resistance R15 one end, the adjustable resistance R15 other end is connected with operational amplifier T2 outfan and intelligent controller, operational amplifier T2 positive pole connects place of working, operational amplifier T2 running voltage two ends are connected with DC source VCC and VDD respectively.
Further, the sampling of described zero-sequence current with amplitude rectification circuit is, zero-sequence current combined resistance R16, R17, R18 parallel connection and zero-sequence current combined resistance R16, R17, one end of R18 and operational amplifier T3 negative pole, zero-sequence current amplitude rectification resistance R19 one end connects, the zero-sequence current amplitude rectification resistance R19 other end is connected with adjustable resistance R20 one end, the adjustable resistance R20 other end is connected with operational amplifier T3 outfan and intelligent controller, operational amplifier T3 positive pole connects place of working, operational amplifier T3 operating current two ends are connected with DC source 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:
nullLine voltage precisely samples: A、A C phases line voltage blood pressure lowering of warp voltage sampling transformer L1 is again through resistance R2、Bis-blood pressure lowerings of transformator L5，Secondary output at transformator L5，Through protection pressure-sensitive device D1、After resistance R3 overvoltage limits protection，The resistance ratio of correction base value resistance R6 and correction base value resistance R4 determines the base value of accuracy correction，Amplitude rectification resistance R9 and adjustable resistance R10 and amplitude rectification resistance R5、Operational amplifier T1 forms a ratio circuit，The amplitude error produced by regulation adjustable resistance R10 compensation line voltage sampling，Phasing capacitor C1、Adjustable resistance R7、Resistance R8 and operational amplifier T1 forms a peaker，The phase error produced by regulation adjustable resistance R7 compensation line voltage sampling，It is connected to intelligent controller 1 by operational amplifier T1 outfan after sample line voltage is calibrated；
nullA phase voltage precisely samples: A phase voltage UA is after A phase voltage sample resistance R1A blood pressure lowering with A phase sampling transformer L2A electrical isolation，Through protection pressure-sensitive device D1B、After resistance R3B overvoltage limits protection，The resistance ratio of correction base value resistance R6B and correction base 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 forms a ratio circuit，The amplitude error produced by regulation adjustable resistance R10B correction phase voltage sampling，Phasing capacitor C1B、Adjustable resistance R7B、Resistance R8B and operational amplifier T1B forms a peaker，The phase error produced by regulation adjustable resistance R7B correction phase voltage sampling，It is connected to intelligent controller 1 and residual voltage combined resistance R11 by operational amplifier T1B outfan after A phase sampling voltage is calibrated；
B phase voltage precisely samples precisely to sample with C phase voltage and precisely samples identical with A phase voltage；
nullA phase current precisely samples: A phase current flows and after electrical isolation through bis-falls of A phase sampling transformer L4A after stream and electrical isolation once drop in A phase current sampling mutual inductor L3A，Through protection pressure-sensitive device D1E、After resistance R3E overvoltage limits protection，The resistance ratio of correction base value resistance R6E and correction base value resistance R4E determines the base value of accuracy correction，Amplitude rectification resistance R9E and adjustable resistance R10E and amplitude rectification resistance R5E、Operational amplifier T1E forms a ratio circuit，The amplitude error produced by regulation adjustable resistance R10E correction phase current sampling，Phasing capacitor C1E、Adjustable resistance R7E、Resistance R8E and operational amplifier T1E forms a peaker，The phase error produced by regulation adjustable resistance R7E correction phase current sampling，It is connected to intelligent controller 1 and zero-sequence current combined resistance R16 by operational amplifier T1E outfan after A phase sampling current is calibrated；
B phase current precisely samples precisely to sample with C phase current and precisely samples identical with A phase current；
Residual voltage precisely samples: A, B, C three-phase voltage is added generation residual voltage through residual voltage combined resistance R11, R12, R13 at the negative pole of operational amplifier T2 respectively, being connected to intelligent controller 1 by the outfan of operational amplifier T2 after the amplitude rectification that residual voltage amplitude rectification resistance R14, adjustable resistance R15, operational amplifier T2 form, regulation adjustable resistance R15 changes output amplitude；
Zero-sequence current precisely samples: A, B, C three-phase current is added generation zero-sequence current through zero-sequence current combined resistance R16, R17, R18 at the negative pole of operational amplifier T3 respectively, being connected to intelligent controller 1 by the outfan of operational amplifier T3 after the amplitude rectification that zero-sequence current amplitude rectification resistance R19, adjustable resistance R20, operational amplifier T3 form, regulation adjustable resistance R20 changes output amplitude；
Ground connection precisely judges: the line voltage analog that operational amplifier T1A is exported by intelligent controller 1, operational amplifier T1B, T1C, the voltage analog of T1D output, operational amplifier T1E, T1F, the phase current analog quantity of T1G output, the residual voltage analog quantity of operational amplifier T2 output and the amplitude of the zero-sequence current analog quantity of operational amplifier T3 output and phase place are digitized processing, on the basis of relevant parameter is accurately measured, thus the state of high-tension line is precisely judged according to dependency rule, ground connection separate, the position of ground connection, the character of ground connection, the situation of ground connection.
Further; intelligent process, intelligent controller 1, on the basis of ground connection precisely judges, sends ground state signal by GPRS communication component 4; and by circuit-breaker switching on-off driving and drive disk assembly 2, breaker body parts S is carried out separating brake according to ground state, it is achieved ground protection.
The present invention compared with prior art, has the following advantages and effect: simple for structure, reliable, easy to maintenance, it is possible to precisely judge electrical network ground connection such that it is able to correct starting protection or warning.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection of the present invention.
Fig. 2 is the circuit diagram sampling protection amplitude rectification phase-correcting circuit of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection of the present invention.
Fig. 3 is the residual voltage sampling circuit diagram with amplitude rectification circuit of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection of the present invention.
Fig. 4 is the zero-sequence current sampling circuit diagram with amplitude rectification circuit of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection of the present invention.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following example are explanation of the invention and the invention is not limited in following example.
As shown in the figure, a kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection of the present invention, comprise breaker body parts S, intelligent controller 1, circuit-breaker switching on-off drives and drive disk assembly 2, working power 3 and 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 sample resistance R1C, C phase sampling transformer L2C, A phase current sampling mutual inductor L3A, A phase sampling transformer L4A, B phase current sampling mutual inductor L3B, B phase sampling transformer L4B, C phase current sampling mutual inductor L3C, C phase sampling transformer L4C.
Breaker body parts S is connected to three-phase alternating-current supply UA, UB, on UC, the primary coil two ends of working power 3 and line voltage sampling transformer L1 respectively with three-phase alternating-current supply UA, UC connects, secondary coil one end of working power 3 and line voltage sampling transformer L1 is connected with working power and resistance R2 one end, the resistance R2 other end is connected with transformator L5 primary coil one end, the secondary coil other end of working power 3 and line voltage sampling transformer L1 is connected with the transformator L5 primary coil other end and working power 3, working power 3 exports DC source VCC and VDD respectively.
A phase voltage sample resistance R1A one end is connected with three phase mains UA, and the A phase voltage sample resistance R1A other end is connected with primary coil one end of A phase sampling transformer L2A, the primary coil other end ground connection of A phase sampling transformer L2A；B phase voltage sample resistance R1B one end is connected with three phase mains UB, and the B phase voltage sample resistance R1B other end is connected with primary coil one end of B phase sampling transformer L2B, the primary coil other end ground connection of B phase sampling transformer L2B；C phase voltage sample resistance R1C one end is connected with three phase mains UC, and the C phase voltage sample resistance R1C other end is connected with primary coil one end of C phase sampling transformer L2C, the primary coil other end ground connection of C phase sampling transformer L2C,.
A phase current sampling mutual inductor L3A is arranged on three phase mains UA, and A phase current sampling mutual inductor L3A two ends are connected with A phase sampling transformer L4A two ends and A phase current sampling mutual inductor L3A and one end ground connection of A phase sampling transformer L4A；B phase current sampling mutual inductor L3B is arranged on three phase mains UB, and B phase current sampling mutual inductor L3B two ends are connected with B phase sampling transformer L4B two ends and B phase current sampling mutual inductor L3B and one end ground connection of B phase sampling transformer L4B；C phase current sampling mutual inductor L3C is arranged on three phase mains UC, and C phase current sampling mutual inductor L3C two ends are connected with C phase sampling transformer L4C two ends and C phase current sampling mutual inductor L3C and one end ground connection of C phase sampling transformer L4B.
nullTransformator L5、A phase sampling transformer L2A、B phase sampling transformer L2B、C phase sampling transformer L2C、A phase sampling transformer L4A、B phase sampling transformer L4B、The secondary coil of C phase sampling transformer L4C connects with corresponding sampling protection amplitude rectification phase-correcting circuit，Sampling protection amplitude rectification phase-correcting circuit connects output and is connected with intelligent controller，A phase sampling transformer L2A、B phase sampling transformer L2B、Sampling protection amplitude rectification phase-correcting circuit corresponding for C phase sampling transformer L2C is connected with amplitude rectification circuit with residual voltage sampling，A phase sampling transformer L4A、B phase sampling transformer L4B、Sampling protection amplitude rectification phase-correcting circuit corresponding for C phase sampling transformer L4C is connected with amplitude rectification circuit with zero-sequence current sampling，Residual voltage sampling is connected with amplitude rectification circuit and zero-sequence current sampling is connected output and is connected with intelligent controller with amplitude rectification circuit，Circuit-breaker switching on-off drives and drive disk assembly is connected with breaker body parts S and intelligent controller respectively by intelligent controller control breaker body parts S break-make.
The outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection also comprises GPRS communication component, and GPRS communication component is connected with intelligent controller.
nullSampling protection amplitude rectification phase-correcting circuit is，Protection pressure-sensitive device D1 positive pole、Resistance R3 one end、Correction base value resistance R4 one end、Amplitude rectification resistance R5 one end is connected with the place of working of working power，Protection pressure-sensitive device D1 negative pole and the resistance R3 other end、Correction base value resistance R6 one end、Phasing capacitor C1 one end connects，The correction base value resistance R6 other end and the correction base value resistance R4 other end、Adjustable resistance R7 one end connects，The adjustable resistance R7 other end is connected with resistance R8 one end，The resistance R8 other end and the phasing capacitor C1 other end、Operational amplifier T1 positive pole connects，The amplitude rectification resistance R5 other end and operational amplifier T1 negative pole、Amplitude rectification resistance R9 one end connects，The amplitude rectification resistance R9 other end is connected with adjustable resistance R10 one end，The adjustable resistance R10 other end is connected with operational amplifier T1 outfan，Operational amplifier T1 running voltage two ends are connected with DC source VCC and VDD respectively.
Residual voltage sampling with amplitude rectification circuit is, residual voltage combined resistance R11, R12, R13 one end in parallel and residual voltage combined resistance R11, R12, R13 is connected with operational amplifier T2 negative pole, residual voltage amplitude rectification resistance R14 one end, the residual voltage amplitude rectification resistance R14 other end is connected with adjustable resistance R15 one end, the adjustable resistance R15 other end is connected with operational amplifier T2 outfan and intelligent controller, operational amplifier T2 positive pole connects place of working, and operational amplifier T2 running voltage two ends are connected with DC source VCC and VDD respectively.
Zero-sequence current sampling with amplitude rectification circuit is, zero-sequence current combined resistance R16, R17, R18 one end in parallel and zero-sequence current combined resistance R16, R17, R18 is connected with operational amplifier T3 negative pole, zero-sequence current amplitude rectification resistance R19 one end, the zero-sequence current amplitude rectification resistance R19 other end is connected with adjustable resistance R20 one end, the adjustable resistance R20 other end is connected with operational amplifier T3 outfan and intelligent controller, operational amplifier T3 positive pole connects place of working, and operational amplifier T3 operating current two ends are connected with DC source VCC and VDD respectively.
It is in particular:
nullThe sampling protection amplitude rectification phase-correcting circuit corresponding with transformator L5 is，Protection pressure-sensitive device D1A positive pole、Resistance R3A one end、Correction base value resistance R4A one end、Amplitude rectification resistance R5A one end is connected with the place of working of working power，Protection pressure-sensitive device D1A negative pole and the resistance R3A other end、Correction base value resistance R6A one end、Phasing capacitor C1A one end connects，The correction base value resistance R6A other end and the correction base value resistance R4A other end、Adjustable resistance R7A one end connects，The adjustable resistance R7A other end is connected with resistance R8A one end，The resistance R8A other end and the phasing capacitor C1A other end、Operational amplifier T1A positive pole connects，The amplitude rectification resistance R5A other end and operational amplifier T1A negative pole、Amplitude rectification resistance R9A one end connects，The amplitude rectification resistance R9A other end is connected with adjustable resistance R10A one end，The adjustable resistance R10A other end is connected with operational amplifier T1A outfan，Operational amplifier T1A running voltage two ends are connected with DC source VCC and VDD respectively.The secondary coil of transformator L5 is connected with the both positive and negative polarity protecting pressure-sensitive device D1A respectively.The outfan of the adjustable resistance R10A other end and operational amplifier T1A is connected with intelligent controller 1.
nullThe sampling protection amplitude rectification phase-correcting circuit corresponding with A phase sampling transformer L2A is，Protection pressure-sensitive device D1B positive pole、Resistance R3B one end、Correction base value resistance R4B one end、Amplitude rectification resistance R5B one end is connected with the place of working of working power，Protection pressure-sensitive device D1B negative pole and the resistance R3B other end、Correction base value resistance R6B one end、Phasing capacitor C1B one end connects，The correction base value resistance R6B other end and the correction base value resistance R4B other end、Adjustable resistance R7B one end connects，The adjustable resistance R7B other end is connected with resistance R8B one end，The resistance R8B other end and the phasing capacitor C1B other end、Operational amplifier T1B positive pole connects，The amplitude rectification resistance R5B other end and operational amplifier T1B negative pole、Amplitude rectification resistance R9B one end connects，The amplitude rectification resistance R9B other end is connected with adjustable resistance R10B one end，The adjustable resistance R10B other end is connected with operational amplifier T1B outfan，Operational amplifier T1B running voltage two ends are connected with DC source VCC and VDD respectively.The secondary coil two ends of A phase sampling transformer L2A are connected with the both positive and negative polarity protecting pressure-sensitive device D1B respectively.The outfan of the adjustable resistance R10B other end and operational amplifier T1B is connected with the other end of intelligent controller 1 and residual voltage combined resistance R11.
nullThe sampling protection amplitude rectification phase-correcting circuit corresponding with B phase sampling transformer L2B is，Protection pressure-sensitive device D1C positive pole、Resistance R3C one end、Correction base value resistance R4C one end、Amplitude rectification resistance R5C one end is connected with the place of working of working power，Protection pressure-sensitive device D1C negative pole and the resistance R3C other end、Correction base value resistance R6C one end、Phasing capacitor C1C one end connects，The correction base value resistance R6C other end and the correction base value resistance R4C other end、Adjustable resistance R7C one end connects，The adjustable resistance R7C other end is connected with resistance R8C one end，The resistance R8C other end and the phasing capacitor C1C other end、Operational amplifier T1C positive pole connects，The amplitude rectification resistance R5C other end and operational amplifier T1C negative pole、Amplitude rectification resistance R9C one end connects，The amplitude rectification resistance R9C other end is connected with adjustable resistance R10C one end，The adjustable resistance R10C other end is connected with operational amplifier T1C outfan，Operational amplifier T1C running voltage two ends are connected with DC source VCC and VDD respectively.The secondary coil two ends of B phase sampling transformer L2B are connected with the both positive and negative polarity protecting pressure-sensitive device D1C respectively.The outfan of the adjustable resistance R10C other end and operational amplifier T1C is connected with the other end of intelligent controller 1 and residual voltage combined resistance R12.
nullThe sampling protection amplitude rectification phase-correcting circuit corresponding with C phase sampling transformer L2C is，Protection pressure-sensitive device D1D positive pole、Resistance R3D one end、Correction base value resistance R4D one end、Amplitude rectification resistance R5D one end is connected with the place of working of working power，Protection pressure-sensitive device D1D negative pole and the resistance R3D other end、Correction base value resistance R6D one end、Phasing capacitor C1D one end connects，The correction base value resistance R6D other end and the correction base value resistance R4D other end、Adjustable resistance R7D one end connects，The adjustable resistance R7D other end is connected with resistance R8D one end，The resistance R8D other end and the phasing capacitor C1D other end、Operational amplifier T1D positive pole connects，The amplitude rectification resistance R5D other end and operational amplifier T1D negative pole、Amplitude rectification resistance R9D one end connects，The amplitude rectification resistance R9D other end is connected with adjustable resistance R10D one end，The adjustable resistance R10D other end is connected with operational amplifier T1D outfan，Operational amplifier T1D running voltage two ends are connected with DC source VCC and VDD respectively.The secondary coil two ends of C phase sampling transformer L2C are connected with the both positive and negative polarity protecting pressure-sensitive device D1D respectively.The outfan of the adjustable resistance R10D other end and operational amplifier T1D is connected with the other end of intelligent controller 1 and residual voltage combined resistance R13.
nullThe sampling protection amplitude rectification phase-correcting circuit corresponding with A phase sampling transformer L4A is，Protection pressure-sensitive device D1E positive pole、Resistance R3E one end、Correction base value resistance R4E one end、Amplitude rectification resistance R5E one end is connected with the place of working of working power，Protection pressure-sensitive device D1E negative pole and the resistance R3E other end、Correction base value resistance R6E one end、Phasing capacitor C1E one end connects，The correction base value resistance R6E other end and the correction base value resistance R4E other end、Adjustable resistance R7E one end connects，The adjustable resistance R7E other end is connected with resistance R8E one end，The resistance R8E other end and the phasing capacitor C1E other end、Operational amplifier T1E positive pole connects，The amplitude rectification resistance R5E other end and operational amplifier T1E negative pole、Amplitude rectification resistance R9E one end connects，The amplitude rectification resistance R9E other end is connected with adjustable resistance R10E one end，The adjustable resistance R10E other end is connected with operational amplifier T1E outfan，Operational amplifier T1E running voltage two ends are connected with DC source VCC and VDD respectively.The secondary coil two ends of A phase sampling transformer L4A are connected with the both positive and negative polarity protecting pressure-sensitive device D1E respectively.The outfan of the adjustable resistance R10E other end and operational amplifier T1E is connected with the other end of intelligent controller 1 and residual voltage combined resistance R16.
nullThe sampling protection amplitude rectification phase-correcting circuit corresponding with B phase sampling transformer L4B is，Protection pressure-sensitive device D1F positive pole、Resistance R3F one end、Correction base value resistance R4F one end、Amplitude rectification resistance R5F one end is connected with the place of working of working power，Protection pressure-sensitive device D1F negative pole and the resistance R3F other end、Correction base value resistance R6F one end、Phasing capacitor C1F one end connects，The correction base value resistance R6F other end and the correction base value resistance R4F other end、Adjustable resistance R7F one end connects，The adjustable resistance R7F other end is connected with resistance R8F one end，The resistance R8F other end and the phasing capacitor C1F other end、Operational amplifier T1F positive pole connects，The amplitude rectification resistance R5F other end and operational amplifier T1F negative pole、Amplitude rectification resistance R9F one end connects，The amplitude rectification resistance R9F other end is connected with adjustable resistance R10F one end，The adjustable resistance R10F other end is connected with operational amplifier T1F outfan，Operational amplifier T1F running voltage two ends are connected with DC source VCC and VDD respectively.The secondary coil two ends of B phase sampling transformer L4B are connected with the both positive and negative polarity protecting pressure-sensitive device D1F respectively.The outfan of the adjustable resistance R10F other end and operational amplifier T1F is connected with the other end of intelligent controller 1 and residual voltage combined resistance R17.
nullThe sampling protection amplitude rectification phase-correcting circuit corresponding with C phase sampling transformer L4C is，Protection pressure-sensitive device D1G positive pole、Resistance R3G one end、Correction base value resistance R4G one end、Amplitude rectification resistance R5G one end is connected with the place of working of working power，Protection pressure-sensitive device D1G negative pole and the resistance R3G other end、Correction base value resistance R6G one end、Phasing capacitor C1G one end connects，The correction base value resistance R6G other end and the correction base value resistance R4G other end、Adjustable resistance R7G one end connects，The adjustable resistance R7G other end is connected with resistance R8G one end，The resistance R8G other end and the phasing capacitor C1G other end、Operational amplifier T1G positive pole connects，The amplitude rectification resistance R5G other end and operational amplifier T1G negative pole、Amplitude rectification resistance R9G one end connects，The amplitude rectification resistance R9G other end is connected with adjustable resistance R10G one end，The adjustable resistance R10G other end is connected with operational amplifier T1G outfan，Operational amplifier T1G running voltage two ends are connected with DC source VCC and VDD respectively.The secondary coil two ends of C phase sampling transformer L4C are connected with the both positive and negative polarity protecting pressure-sensitive device D1G respectively.The outfan of the adjustable resistance R10G other end and operational amplifier T1G is connected 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 voltage blood pressure lowering of warp voltage sampling transformer L1 is again through resistance R2, bis-blood pressure lowerings of transformator L5; secondary output at transformator L5; after protection pressure-sensitive device D1, resistance R3 overvoltage limit protection; the resistance ratio of correction base value resistance R6 and correction base value resistance R4 determines the base value of accuracy correction; amplitude rectification resistance R9 and adjustable resistance R10 and amplitude rectification resistance R5, operational amplifier T1 form a ratio circuit, the amplitude error produced by regulation adjustable resistance R10 compensation line voltage sampling.Phasing capacitor C1, adjustable resistance R7, resistance R8 form a peaker with operational amplifier T1, the phase error produced by regulation adjustable resistance R7 compensation line voltage sampling.It is connected to intelligent controller 1 by operational amplifier T1 outfan after sample line voltage is calibrated.
The accurate sampling theorem of phase voltage: (B phase voltage UB is through B phase voltage sample resistance R1B blood pressure lowering and B phase sampling transformer L2B electrical isolation with A phase sampling transformer L2A electrical isolation through A phase voltage sample resistance R1A blood pressure lowering for A phase voltage UA, C phase voltage UC is through C phase voltage sample resistance R1C blood pressure lowering and C phase sampling transformer L2C electrical isolation) after, through protection pressure-sensitive device D1B, after resistance R3B overvoltage limits protection, the resistance ratio of correction base value resistance R6B and correction base 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 forms a ratio circuit, the amplitude error produced by regulation adjustable resistance R10B correction phase voltage sampling.Phasing capacitor C1B, adjustable resistance R7B, resistance R8B form a peaker with operational amplifier T1B, the phase error produced by regulation adjustable resistance R7B correction phase voltage sampling.After A phase sampling voltage is calibrated by operational amplifier T1B outfan be connected to intelligent controller 1 and residual voltage combined resistance R11(B phase sampling voltage calibrated after be connected to intelligent controller 1 and residual voltage combined resistance R12 by operational amplifier T1B outfan, be connected to intelligent controller 1 and residual voltage combined resistance R13 by operational amplifier T1B outfan after C phase sampling voltage is calibrated).
nullThe accurate sampling theorem of phase current: A phase current drops stream for bis-times through A phase sampling transformer L4A after stream and electrical isolation once drop in A phase current sampling mutual inductor L3A, and (B phase current drops stream and electrical isolation bis-times through B phase sampling transformer L4B after stream and electrical isolation once drop in B phase current sampling mutual inductor L3B with electrical isolation，C phase current flows and electrical isolation through bis-falls of C phase sampling transformer L4C after stream and electrical isolation once drop in C phase current sampling mutual inductor L3C) after，Through protection pressure-sensitive device D1E、After resistance R3E overvoltage limits protection，The resistance ratio of correction base value resistance R6E and correction base value resistance R4E determines the base value of accuracy correction，Amplitude rectification resistance R9E and adjustable resistance R10E and amplitude rectification resistance R5E、Operational amplifier T1E forms a ratio circuit，The amplitude error produced by regulation adjustable resistance R10E correction phase current sampling.Phasing capacitor C1E, adjustable resistance R7E, resistance R8E form a peaker with operational amplifier T1E, the phase error produced by regulation adjustable resistance R7E correction phase current sampling.After A phase sampling current is calibrated by operational amplifier T1E outfan be connected to intelligent controller 1 and residual voltage combined resistance R16(B phase sampling current calibrated after be connected to intelligent controller 1 and residual voltage combined resistance R17 by operational amplifier T1E outfan, be connected to intelligent controller 1 and residual voltage combined resistance R18 by operational amplifier T1E outfan after C phase sampling current is calibrated).
The accurate sampling theorem of residual voltage: A, B, C three-phase voltage is added generation residual voltage through residual voltage combined resistance R11, R12, R13 at the negative pole of operational amplifier T2 respectively, being connected to intelligent controller 1 by the outfan of operational amplifier T2 after the amplitude rectification that residual voltage amplitude rectification resistance R14, adjustable resistance R15, operational amplifier T2 form, regulation adjustable resistance R15 changes output amplitude.
The accurate sampling theorem of zero-sequence current: A, B, C three-phase current is added generation zero-sequence current through zero-sequence current combined resistance R16, R17, R18 at the negative pole of operational amplifier T3 respectively, being connected to intelligent controller 1 by the outfan of operational amplifier T3 after the amplitude rectification that zero-sequence current amplitude rectification resistance R19, adjustable resistance R20, operational amplifier T3 form, regulation adjustable resistance R20 changes output amplitude.
Ground connection precisely judges principle: the line voltage analog that operational amplifier T1A is exported by intelligent controller 1, operational amplifier T1B, T1C, the voltage analog of T1D output, operational amplifier T1E, T1F, the phase current analog quantity of T1G output, the residual voltage analog quantity of operational amplifier T2 output and the amplitude of the zero-sequence current analog quantity of operational amplifier T3 output and phase place are digitized processing, on the basis of relevant parameter is accurately measured, thus the state (ground connection/earth-free) of high-tension line is precisely judged according to dependency rule, separate (the A phase/B phase/C phase) of ground connection, the position (mains side/load-side) of ground connection, the character (metallic earthing/arc light ground connection) of ground connection, the situation (earth current size and arc light grounding surge situation) of ground connection.
Intelligent principle: intelligent controller 1 is on the basis of ground connection precisely judges; ground state signal is sent by GPRS communication component 4; and by circuit-breaker switching on-off driving and drive disk assembly 2, breaker body parts S is carried out separating brake according to ground state, it is achieved ground protection.Intelligent controller 1 is on the basis of gathering line voltage, phase voltage, phase current; and driven and drive disk assembly 2, GPRS communication component 4 by circuit-breaker switching on-off; realize measuring, control, protect, comprehensive automation (or intellectuality) function such as signal, telemechanical, self diagnosis, as automatic circuit, device etc. of demarcating in adapted electricity Automation System of Power Network.
Above content described in this specification is only illustration made for the present invention.Described specific embodiment can be made various amendment or supplements or use similar mode to substitute by those skilled in the art; without departing from the content of description of the invention or surmount scope defined in the claims, protection scope of the present invention all should be belonged to.
Claims (7)
- null1. the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection，It is characterized in that: comprise breaker body parts S、Intelligent controller、Circuit-breaker switching on-off drives and drive disk assembly、Working power and 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 sample resistance R1C、C phase sampling transformer L2C、A phase current sampling mutual inductor L3A、A phase sampling transformer L4A、B phase current sampling mutual inductor L3B、B phase sampling transformer L4B、C phase current sampling mutual inductor L3C、C phase sampling transformer L4C，Breaker body parts are connected to three-phase alternating-current supply UA、UB、On UC，The primary coil two ends of working power and line voltage sampling transformer L1 respectively with three-phase alternating-current supply UA、UC connects，Working power is connected with working power and resistance R2 one end with secondary coil one end of line voltage sampling transformer L1，The resistance R2 other end is connected with transformator L5 primary coil one end，The secondary coil other end of working power and line voltage sampling transformer L1 is connected with the transformator L5 primary coil other end and working power，Working power exports DC source VCC and VDD respectively，A phase voltage sample resistance R1A one end is connected with three phase mains UA，The A phase voltage sample resistance R1A other end is connected with primary coil one end of A phase sampling transformer L2A，The primary coil other end ground connection of A phase sampling transformer L2A，B phase voltage sample resistance R1B one end is connected with three phase mains UB，The B phase voltage sample resistance R1B other end is connected with primary coil one end of B phase sampling transformer L2B，The primary coil other end ground connection of B phase sampling transformer L2B,C phase voltage sample resistance R1C one end is connected with three phase mains UC，The C phase voltage sample resistance R1C other end is connected with primary coil one end of C phase sampling transformer L2C，The primary coil other end ground connection of C phase sampling transformer L2C,A phase current sampling mutual inductor L3A is arranged on three phase mains UA，A phase current sampling mutual inductor L3A two ends are connected with A phase sampling transformer L4A two ends and A phase current sampling mutual inductor L3A and one end ground connection of A phase sampling transformer L4A，B phase current sampling mutual inductor L3B is arranged on three phase mains UB，B phase current sampling mutual inductor L3B two ends are connected with B phase sampling transformer L4B two ends and B phase current sampling mutual inductor L3B and one end ground connection of B phase sampling transformer L4B，C phase current sampling mutual inductor L3C is arranged on three phase mains UC，C phase current sampling mutual inductor L3C two ends are connected with C phase sampling transformer L4C two ends and C phase current sampling mutual inductor L3C and one end ground connection of C phase sampling transformer L4B，Transformator L5、A phase sampling transformer L2A、B phase sampling transformer L2B、C phase sampling transformer L2C、A phase sampling transformer L4A、B phase sampling transformer L4B、The secondary coil of C phase sampling transformer L4C connects with corresponding sampling protection amplitude rectification phase-correcting circuit，Sampling protection amplitude rectification phase-correcting circuit connects output and is connected with intelligent controller，A phase sampling transformer L2A、B phase sampling transformer L2B、Sampling protection amplitude rectification phase-correcting circuit corresponding for C phase sampling transformer L2C is connected with amplitude rectification circuit with residual voltage sampling，A phase sampling transformer L4A、B phase sampling transformer L4B、Sampling protection amplitude rectification phase-correcting circuit corresponding for C phase sampling transformer L4C is connected with amplitude rectification circuit with zero-sequence current sampling，Residual voltage sampling is connected with amplitude rectification circuit and zero-sequence current sampling is connected output and is connected with intelligent controller with amplitude rectification circuit，Circuit-breaker switching on-off drives and drive disk assembly is connected with breaker body parts S and intelligent controller respectively by intelligent controller control breaker body parts S break-make.
- 2. according to the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection described in claim 1, it is characterised in that: also comprising GPRS communication component, GPRS communication component is connected with intelligent controller.
- null3. according to the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection described in claim 1，It is characterized in that: described sampling protection amplitude rectification phase-correcting circuit is，Protection pressure-sensitive device D1 positive pole、Resistance R3 one end、Correction base value resistance R4 one end、Amplitude rectification resistance R5 one end is connected with the place of working of working power，Protection pressure-sensitive device D1 negative pole and the resistance R3 other end、Correction base value resistance R6 one end、Phasing capacitor C1 one end connects，The correction base value resistance R6 other end and the correction base value resistance R4 other end、Adjustable resistance R7 one end connects，The adjustable resistance R7 other end is connected with resistance R8 one end，The resistance R8 other end and the phasing capacitor C1 other end、Operational amplifier T1 positive pole connects，The amplitude rectification resistance R5 other end and operational amplifier T1 negative pole、Amplitude rectification resistance R9 one end connects，The amplitude rectification resistance R9 other end is connected with adjustable resistance R10 one end，The adjustable resistance R10 other end is connected with operational amplifier T1 outfan，Operational amplifier T1 running voltage two ends are connected with DC source VCC and VDD respectively.
- 4. according to the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection described in claim 1, it is characterized in that: the sampling of described residual voltage with amplitude rectification circuit is, residual voltage combined resistance R11, R12, R13 parallel connection and residual voltage combined resistance R11, R12, one end of R13 and operational amplifier T2 negative pole, residual voltage amplitude rectification resistance R14 one end connects, the residual voltage amplitude rectification resistance R14 other end is connected with adjustable resistance R15 one end, the adjustable resistance R15 other end is connected with operational amplifier T2 outfan and intelligent controller, operational amplifier T2 positive pole connects place of working, operational amplifier T2 running voltage two ends are connected with DC source VCC and VDD respectively.
- 5. according to the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection described in claim 1, it is characterized in that: the sampling of described zero-sequence current with amplitude rectification circuit is, zero-sequence current combined resistance R16, R17, R18 parallel connection and zero-sequence current combined resistance R16, R17, one end of R18 and operational amplifier T3 negative pole, zero-sequence current amplitude rectification resistance R19 one end connects, the zero-sequence current amplitude rectification resistance R19 other end is connected with adjustable resistance R20 one end, the adjustable resistance R20 other end is connected with operational amplifier T3 outfan and intelligent controller, operational amplifier T3 positive pole connects place of working, operational amplifier T3 operating current two ends are connected with DC source VCC and VDD respectively.
- 6. the control method of the outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection, it is characterised in that:nullLine voltage precisely samples: A、A C phases line voltage blood pressure lowering of warp voltage sampling transformer L1 is again through resistance R2、Bis-blood pressure lowerings of transformator L5，Secondary output at transformator L5，Through protection pressure-sensitive device D1、After resistance R3 overvoltage limits protection，The resistance ratio of correction base value resistance R6 and correction base value resistance R4 determines the base value of accuracy correction，Amplitude rectification resistance R9 and adjustable resistance R10 and amplitude rectification resistance R5、Operational amplifier T1 forms a ratio circuit，The amplitude error produced by regulation adjustable resistance R10 compensation line voltage sampling，Phasing capacitor C1、Adjustable resistance R7、Resistance R8 and operational amplifier T1 forms a peaker，The phase error produced by regulation adjustable resistance R7 compensation line voltage sampling，It is connected to intelligent controller 1 by operational amplifier T1 outfan after sample line voltage is calibrated；nullA phase voltage precisely samples: A phase voltage UA is after A phase voltage sample resistance R1A blood pressure lowering with A phase sampling transformer L2A electrical isolation，Through protection pressure-sensitive device D1B、After resistance R3B overvoltage limits protection，The resistance ratio of correction base value resistance R6B and correction base 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 forms a ratio circuit，The amplitude error produced by regulation adjustable resistance R10B compensation line voltage sampling，Phasing capacitor C1B、Adjustable resistance R7B、Resistance R8B and operational amplifier T1B forms a peaker，The phase error produced by regulation adjustable resistance R7B correction phase voltage sampling，It is connected to intelligent controller 1 and residual voltage combined resistance R11 by operational amplifier T1B outfan after A phase sampling voltage is calibrated；B phase voltage precisely samples precisely to sample with C phase voltage and precisely samples identical with A phase voltage；nullA phase current precisely samples: A phase current flows and after electrical isolation through bis-falls of A phase sampling transformer L4A after stream and electrical isolation once drop in A phase current sampling mutual inductor L3A，Through protection pressure-sensitive device D1E、After resistance R3E overvoltage limits protection，The resistance ratio of correction base value resistance R6E and correction base value resistance R4E determines the base value of accuracy correction，Amplitude rectification resistance R9E and adjustable resistance R10E and amplitude rectification resistance R5E、Operational amplifier T1E forms a ratio circuit，The amplitude error produced by regulation adjustable resistance R10E correction phase current sampling，Phasing capacitor C1E、Adjustable resistance R7E、Resistance R8E and operational amplifier T1E forms a peaker，The phase error produced by regulation adjustable resistance R7E correction phase current sampling，It is connected to intelligent controller 1 and zero-sequence current combined resistance R16 by operational amplifier T1E outfan after A phase sampling current is calibrated；B phase current precisely samples precisely to sample with C phase current and precisely samples identical with A phase current；Residual voltage precisely samples: A, B, C three-phase voltage is added generation residual voltage through residual voltage combined resistance R11, R12, R13 at the negative pole of operational amplifier T2 respectively, being connected to intelligent controller 1 by the outfan of operational amplifier T2 after the amplitude rectification that residual voltage amplitude rectification resistance R14, adjustable resistance R15, operational amplifier T2 form, regulation adjustable resistance R15 changes output amplitude；Zero-sequence current precisely samples: A, B, C three-phase current is added generation zero-sequence current through zero-sequence current combined resistance R16, R17, R18 at the negative pole of operational amplifier T3 respectively, being connected to intelligent controller 1 by the outfan of operational amplifier T3 after the amplitude rectification that zero-sequence current amplitude rectification resistance R19, adjustable resistance R20, operational amplifier T3 form, regulation adjustable resistance R20 changes output amplitude；Ground connection precisely judges: the line voltage analog that operational amplifier T1A is exported by intelligent controller 1, operational amplifier T1B, T1C, the voltage analog of T1D output, operational amplifier T1E, T1F, the phase current analog quantity of T1G output, the residual voltage analog quantity of operational amplifier T2 output and the amplitude of the zero-sequence current analog quantity of operational amplifier T3 output and phase place are digitized processing, on the basis of relevant parameter is accurately measured, thus the state of high-tension line is precisely judged according to dependency rule, ground connection separate, the position of ground connection, the character of ground connection, the situation of ground connection.
- 7. according to the control method of a kind of outdoor type high-voltage intelligent circuit breaker precisely judged based on ground connection described in claim 6; it is characterized in that: intelligent process; intelligent controller 1 is on the basis of ground connection precisely judges; ground state signal is sent by GPRS communication component 4; and by circuit-breaker switching on-off driving and drive disk assembly 2, breaker body parts S is carried out separating brake according to ground state, it is achieved ground protection.
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| 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 |
| CN110542829A (en) * | 2019-08-15 | 2019-12-06 | 贵州电网有限责任公司 | direct-current grounding judgment device and method for power distribution network below 35kV |
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| CN105954675B (en) | 2018-10-16 |
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