CN110389276A - A kind of singlephase earth fault management system and method - Google Patents

A kind of singlephase earth fault management system and method Download PDF

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Publication number
CN110389276A
CN110389276A CN201910722336.1A CN201910722336A CN110389276A CN 110389276 A CN110389276 A CN 110389276A CN 201910722336 A CN201910722336 A CN 201910722336A CN 110389276 A CN110389276 A CN 110389276A
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CN
China
Prior art keywords
distribution network
power distribution
unit
supply line
power supply
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CN201910722336.1A
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Chinese (zh)
Inventor
汤学生
李俊
冯四阳
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ANHUI KAICHUAN POWER PROTECTION EQUIPMENT Co Ltd
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ANHUI KAICHUAN POWER PROTECTION EQUIPMENT Co Ltd
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Priority to CN201910722336.1A priority Critical patent/CN110389276A/en
Publication of CN110389276A publication Critical patent/CN110389276A/en
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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
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08Limitation or suppression of earth fault currents, e.g. Petersen coil

Abstract

The present invention discloses a kind of singlephase earth fault management system, it include: power distribution network power supply line unit, node and branch trouble prewarning unit, transmission efficiency monitoring unit and control unit, data information prediction continuous earth failure, instantaneity ground fault and the complex grounding fault with interruption of information and node and branch trouble the prewarning unit feedback that control unit is used to be acquired according to transmission efficiency monitoring unit;Control unit is also used to the accuracy according to the cell failure route selection of current failure type checking current power distribution network power supply line.The present invention solves the drawbacks of tradition individually uses arc suppression coil compensation method and contact arc-suppression method; the content of the application combination arc suppression coil compensation method and contact arc-suppression method is able to achieve switch ground connection extinguishing arc, voltage transformer protection, path monitoring and failure line selection is predicted and the function of verification.

Description

A kind of singlephase earth fault management system and method
Technical field
The present invention relates to technical field of electricity, especially a kind of singlephase earth fault management system and method.
Background technique
Widely used small current line selection mode suffers from that grounding point impedance variations range is big, operating condition is multiple currently on the market Miscellaneous, the various factors such as zero sequence current signal is weak, electromagnetic interference is strong influences, it is difficult to quickly and accurately select generation single-phase earthing Fault branch, route selection accuracy rate are lower.
Common singlephase earth fault processing method has arc suppression coil compensation method and contact arc-suppression method, both troubleshootings Method has his own strong points: arc suppression coil compensation method is suitable for provisional ground fault;And contact arc-suppression rule is adapted to processing permanently Property singlephase earth fault.Biggish limitation can all be had by only choosing single fault handling method in system application.When system is sent out Raw permanent singlephase earth fault, when as occurred single-phase insulation against ground breakdown inside cable, arc suppression coil compensating system capacitor electricity Stream flows through fault point, and relatively insulation cannot restore inside the cable being destroyed when arc extinction faulted phase voltage restores, meeting Punctured again.Repeatedly constantly to fault point Implantation Energy, the neighbouring phase insulation in progressive failure fault point finally may be used for breakdown in this way It can lead to cable phase fault, cause the accident extension.When provisional singlephase earth fault occurs for system, contact is individually used Extinguishing arc rule can cause an artificial grounding point to system, may be that the provisional ground fault that can be eliminated is transformed to One permanent fault, it is clear that this is also not a correctly selection.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of singlephase earth fault management system and sides Method solves the drawbacks of tradition individually uses arc suppression coil compensation method and contact arc-suppression method, the application combination arc suppression coil compensation method With the content of contact arc-suppression method, be able to achieve switch ground connection extinguishing arc, voltage transformer protection, path monitoring and failure line selection prediction and The function of verification.
The purpose of the present invention is achieved through the following technical solutions:
A kind of singlephase earth fault management system, comprising:
Power distribution network power supply line unit, power distribution network power supply line unit include isolated neutral power distribution network, neutral point warp Grounding through arc power distribution network or Neutral Grounding through Resistance in Electrical power distribution network;Power distribution network power supply line unit further includes harmonic elimination electricity Road, harmonic elimination circuit are set to isolated neutral power distribution network, neutral by arc extinction coil grounding power distribution network or neutral point and connect through resistance In ground power distribution network;
Node and branch trouble prewarning unit, the node and branch trouble prewarning unit are for acquiring power distribution network power supply line list Nodal information in member, and analyzed and determined according to the nodal information of acquisition and whether there is fault;The node and branch event Barrier prewarning unit is also used to carry out early warning to fault;
Transmission efficiency monitoring unit, the transmission efficiency monitoring unit are used for the electric current and electricity in power distribution network power supply line unit Pressure information is acquired and monitors;The transmission efficiency monitoring unit be also used to the switching value of power distribution network power supply line unit into Row monitoring;
Control unit, the information and node and branch trouble that described control unit is used to be acquired according to transmission efficiency monitoring unit Data information prediction continuous earth failure, instantaneity ground fault and the complex grounding fault with interruption of prewarning unit feedback;The control Unit is also used to the accuracy according to the cell failure route selection of current failure type checking current power distribution network power supply line;
Described control unit further includes closing time time delay module and opening time time delay module, and closing time time delay module is used for Power distribution network power supply line unit provides delay operation after one-off occurs, and opening time time delay module is used for power distribution network supply lines After one-off separating brake occurs for road unit, realizes and be delayed with system recovery time, if overtime route single-phase fault still exists, Continue new round operation.
It further, further include two-way voltage transformer arranged side by side, two mutual induction of voltage in power distribution network power supply line unit Be additionally provided with maintenance switch between device, maintenance switch for voltage transformer all the way or the connection of two-way voltage transformer or It disconnects, the controller is also used to detect the cut-off signal of voltage transformer.
Further, the voltage transformer is anti-resonance potential transformer.
It further, further include pulse route selection module, the pulse route selection module is for obtaining power distribution network power supply line Electric leakage situation, and according to three road voltage sensor voltages, opening voltage and branch current information judge and screening branch therefore Hinder route, carries out branch trouble route selection.
A kind of singlephase earth fault management system, comprising:
Power distribution network power supply line unit;
Node and branch trouble prewarning unit, the node and branch trouble prewarning unit are for acquiring power distribution network power supply line list Nodal information in member, and analyzed and determined according to the nodal information of acquisition and whether there is fault;The node and branch event Barrier prewarning unit is also used to carry out early warning to fault;
Transmission efficiency monitoring unit, the transmission efficiency monitoring unit are used for the electric current and electricity in power distribution network power supply line unit Pressure information is acquired and monitors;The transmission efficiency monitoring unit be also used to the switching value of power distribution network power supply line unit into Row monitoring;
Control unit, the information and node and branch trouble that described control unit is used to be acquired according to transmission efficiency monitoring unit Data information prediction continuous earth failure, instantaneity ground fault and the complex grounding fault with interruption of prewarning unit feedback;The control Unit is also used to the accuracy according to the cell failure route selection of current failure type checking current power distribution network power supply line;
Wherein,
Power distribution network power supply line unit is isolated neutral power distribution network;
Isolated neutral power distribution network includes electrification display, dynamic capture monitor, grounding transformer, single-phase vacuum contact Device, half-wave rectifier, current transformer, neutral point protection device, voltage transformer, wideband voltage absorber, disconnecting switch, current limliting Fuse, high-tension fuse and dynamic monitoring controller;One end of firewire is connected by disconnecting switch with electrification display, firewire One end also pass through disconnecting switch, dynamic capture monitor ground connection;One end of firewire also pass through disconnecting switch, limiting fuse, Grounding transformer, single-phase vacuum contactor, half-wave rectifier and current transformer ground connection;One end of firewire, which also passes through, to be kept apart Pass, high-tension fuse, voltage transformer and neutral point protection device ground connection;One end of firewire also passes through disconnecting switch, wideband electricity Press absorber ground connection;Dynamic monitoring controller is connected with disconnecting switch.
A kind of singlephase earth fault management system, including power distribution network power supply line unit, node and branch trouble early warning list Member, transmission efficiency monitoring unit and control unit;
Wherein, power distribution network power supply line unit is Neutral Grounding through Resistance in Electrical power distribution network;
Neutral Grounding through Resistance in Electrical power distribution network includes grounding transformer, the first disconnecting switch, resistor, anti-saturation Current Mutual Inductance Device, electrification display, the second disconnecting switch, high-tension fuse, voltage transformer, antiresonance module, full voltage controller, wideband Voltage absorber and control unit;
One end of firewire also passes sequentially through grounding transformer, the first disconnecting switch, resistor, anti-saturation current transformer ground connection; One end of firewire also passes through band line display and is grounded;One end of firewire also passes through the second disconnecting switch, wideband voltage absorber connects Ground;One end of firewire also passes through the second disconnecting switch, high-tension fuse, anti-resonance potential transformer and antiresonance module ground.
A kind of singlephase earth fault management method, comprising:
Parameter detecting: power supply line's node topology figure is established according to power distribution network power supply line unit, and real-time monitoring and display are pre- If the parameter information of node;
Failure predication and failure line selection analysis: current time or the following preset time period are analyzed according to acquisition node parameter information It is interior to whether there is fault, and whether the type of decision circuitry belongs to continuous earth failure, instantaneity ground fault or broken string Ground fault, according to the failure line selection of current failure type checking and analysis power distribution network power supply line unit.
Further, the method also includes:
Transmission efficiency monitoring: in power distribution network power supply line unit electric current and information of voltage be acquired and monitor and right The switching value of power distribution network power supply line unit is monitored.
Further, further include action delay method, specifically include:
After a feed motion occurs for power distribution network power supply line unit, the combined floodgate delay time of preset time period need to be executed;
After a separating brake movement occurs for power distribution network power supply line unit, the separating brake delay time of preset time period need to be executed;
After executing feed motion or separating brake acts, still deposited more than line fault after combined floodgate delay time or separating brake delay time Then executing new round operation.
Further, it when executing fault-line selecting method, specifically includes:
Branch drain conditions, then the data by three-phase voltage, be open voltage and branch current are accurately measured by steady state measurement Information analysis and determining branch trouble route selection.
The beneficial effects of the present invention are:
(1) present invention is made by the method for switch ground connection extinguishing arc, the also function of the delay of increase closing time and opening time delay Circuit voltage stability it is strong, interference resistance is strong;
(2) present invention uses not outer string resistance, and the directly instantaneous opening voltage that is shorted realizes harmonic elimination and an external harmonic elimination resistance, Using two kinds of harmonic elimination modes, harmonic elimination power is improved;
(3) have the function of node and branch trouble early warning and transmission efficiency monitoring, be capable of real-time acquisition node or branch current electricity Parameter information is pressed, to carry out forecast analysis according to the parameter information of acquisition, is judged in current time or the following preset time period With the presence or absence of line fault;
It (4) can be according to the data for the information and node and branch trouble prewarning unit feedback that transmission efficiency monitoring unit acquires Information judges that fault type is continuous earth failure, instantaneity ground fault or the complex grounding fault with interruption, can be according to current failure class The accuracy of type verification current power distribution network power supply line cell failure route selection.
Detailed description of the invention
Fig. 1 is the module diagram block diagram of singlephase earth fault management system of the present invention;
Fig. 2 is power supply line's structural schematic diagram of the embodiment of the present invention 1;
Fig. 3 is power supply line's structural schematic diagram of the embodiment of the present invention 2;
Fig. 4 is power supply line's structural schematic diagram of the embodiment of the present invention 3;
In figure, 1- electrification display, dynamically capture monitor, 3- grounding transformer, 4- single-phase vacuum contactor, 5- half-wave are whole by 2- Stream device, 6- current transformer, 7- neutral point protection device, 8- voltage transformer, 9- wideband voltage absorber, 10- disconnecting switch, 11- limiting fuse, 12- high-tension fuse, 13- dynamic monitoring controller, 14- full voltage controller, the control of 15- switch arc suppression Device, 16- arc suppression coil, 17- vacuum switch, 18- whole network voltage suppressor, 19- high-speed switch, 20- over-voltage protector, 21- Nonlinear resistance, 22- resistor, 23- anti-saturation current transformer, 24- antiresonance module, the first disconnecting switch of 25-, 26- Two disconnecting switch, 101- power distribution network power supply line unit, 102- node and branch trouble prewarning unit, the monitoring of 103- transmission efficiency Unit, 104- control unit.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, invention is further explained.
Embodiment 1:
The present embodiment provides a kind of singlephase earth fault management system, this singlephase earth fault management system is isolated neutral Distribution management system please refers to shown in attached drawing 1, the present embodiment the system comprises:
Power distribution network power supply line unit 101 further includes harmonic elimination circuit, and harmonic elimination circuit is set in isolated neutral power distribution network, Harmonic elimination circuit is not outer string resistance, directly can instantaneously be shorted opening voltage and realize that harmonic elimination, harmonic elimination circuit further include external one and disappear Humorous resistance can improve harmonic elimination power;
Node and branch trouble prewarning unit 102, the node and branch trouble prewarning unit 102 are for acquiring power distribution network power supply Nodal information in line unit, and analyzed and determined according to the nodal information of acquisition and whether there is fault;The node and Branch trouble prewarning unit 102 is also used to carry out early warning to fault;
Transmission efficiency monitoring unit 103, the transmission efficiency monitoring unit 103 are used for in power distribution network power supply line unit 101 Electric current and information of voltage be acquired and monitor;The transmission efficiency monitoring unit 103 is also used to power distribution network power supply line The switching value of unit 101 is monitored;
Control unit 104, the information and node that described control unit 104 is used to be acquired according to transmission efficiency monitoring unit 103 Data information prediction continuous earth failure, instantaneity ground fault and the broken string ground connection fed back with branch trouble prewarning unit 102 Failure;Described control unit 104 is also used to be selected according to 101 failure of current failure type checking current power distribution network power supply line unit The accuracy of line;
Described control unit 104 further includes closing time time delay module and opening time time delay module, closing time time delay module Delay operation is provided after one-off occurs for power distribution network power supply line unit, opening time time delay module is supplied for power distribution network It after one-off separating brake occurs for electric line unit, realizes and is delayed with system recovery time, if overtime route single-phase fault is still deposited Then continuing new round operation.
It please refers to shown in attached drawing 2, isolated neutral power distribution network includes electrification display 1, dynamic capture monitor 2, connects Ground transformer 3, single-phase vacuum contactor 4, half-wave rectifier 5, current transformer 6, neutral point protection device 7, voltage transformer 8, Wideband voltage absorber 9, disconnecting switch 10, limiting fuse 11, high-tension fuse 12 and dynamic monitoring controller 13;Firewire One end is connected by disconnecting switch 10 with electrification display 1, and one end of firewire also passes through disconnecting switch 10, dynamic captures monitor 2 ground connection;One end of firewire also passes through disconnecting switch 10, limiting fuse 11, grounding transformer 3, single-phase vacuum contactor 4, half Wave rectifier 5 and current transformer 6 are grounded;One end of firewire also passes through disconnecting switch 10, high-tension fuse 12, mutual induction of voltage Device 8 and neutral point protection device 7 are grounded;One end of firewire also passes through disconnecting switch 10, wideband voltage absorber 9 is grounded;Dynamically Monitoring controller 13 is connected with disconnecting switch 10.
Embodiment 2:
The present embodiment provides a kind of singlephase earth fault management system, this singlephase earth fault management system is neutral point through extinguishing arc Coil is grounded power distribution network, please refers to shown in attached drawing 3, management system includes:
Dynamic captures monitor 13, neutral point protection device 7, anti-resonance potential transformer 8, wideband voltage absorber 9, electrification display Device 1, disconnecting switch 10, high-tension fuse 12, whole network voltage suppressor 18, current transformer 6, electrification display 1, disconnecting switch 10, limiting fuse 11, vacuum switch 17, nonlinear resistance 21, half-wave rectifier 5, over-voltage protector 20, grounding transformer 3, high-tension fuse 12, arc suppression coil 16 and high-speed switch 19;
One end of firewire is grounded by disconnecting switch 10 and electrification display 1;One end of firewire also passes sequentially through disconnecting switch 10 Monitor 2 is captured with dynamic to be grounded;One end of firewire also passes sequentially through disconnecting switch 10, high-tension fuse 12, antiresonance voltage Mutual inductor 8, neutral point protection device 7 are grounded;One end of firewire also passes through disconnecting switch 10 and wideband voltage absorber 9 is grounded;Fire One end of line passes sequentially through disconnecting switch 10, electrification display 1 is grounded;One end of firewire also passes sequentially through disconnecting switch 10, limit Flow fuse 11, vacuum switch 17, whole network voltage suppressor 18, earth current mutual inductor 6 are grounded;One end of firewire passes sequentially through Disconnecting switch 10, high-tension fuse 12, grounding transformer 3, high-speed switch 19 and arc suppression coil 16 are grounded;One end of firewire is also Disconnecting switch 10, high-tension fuse 12, grounding transformer 3, nonlinear resistance 21 and half-wave rectifier 5 is passed sequentially through to be grounded, One end of firewire also passes sequentially through disconnecting switch 10, over-voltage protector 20 is grounded, and switch arc suppression controller 15 also passes sequentially through Disconnecting switch 10 and electrification display 1 are grounded.
The present embodiment is directed to these problems of 6~35KV system with non effectively earth ed neutral, singlephase earth fault management system System the advantages of incorporating two kinds of earthing modes, the very good solution accuracy rate problem of failure line selection, and provide flexibly, quickly, Effective troubleshooting means.Both the high power supply reliability of original isolated neutral system had been maintained, while having solved arc grounding mistake The safety issue of voltage bring electric equipment operation.
Embodiment 3:
The present embodiment provides a kind of singlephase earth fault management system, this singlephase earth fault management system is neutral point through resistance It is grounded power distribution network, this system includes: power distribution network power supply line unit 101, node and branch trouble prewarning unit 102, transmission effect It can monitoring unit 103 and control unit 104;
Wherein, power distribution network power supply line unit 101 is Neutral Grounding through Resistance in Electrical power distribution network;
Please refer to shown in attached drawing 4, Neutral Grounding through Resistance in Electrical power distribution network 101 include grounding transformer 3, the first disconnecting switch 25, Resistor 22, anti-saturation current transformer 23, electrification display 1, the second disconnecting switch 26, high-tension fuse 12, mutual induction of voltage Device 6, antiresonance module 24, full voltage controller 14 and wideband voltage absorber 9;
One end of firewire also passes sequentially through grounding transformer 3, the first disconnecting switch 25, resistor 22, anti-saturation current transformer Ground connection 23;One end of firewire also passes through band line display 1 and is grounded;One end of firewire also passes through the second disconnecting switch 26, wideband electricity Absorber 9 is pressed to be grounded;One end of firewire also passes through the second disconnecting switch 26, high-tension fuse 12,8 and of anti-resonance potential transformer Antiresonance module 24 is grounded.
Due in the past mostly using isolated neutral and through the method for operation of grounding through arc.In recent years due to electric power The development of system, the increase of user power consumption, some province's utility grids widely popularize the method for operation of resistance eutral grounding.When installation is neutral After point earthing resistance cabinet, when non-metal earthing occurs, is influenced by grounding point resistance, flow through the electricity of grounding point and neutral point It flows than there is significant decrease when metallic earthing, meanwhile, perfect phase voltage rising and be significantly reduced, residual voltage value is about single-phase gold The half of attribute ground connection.It can be seen that current limliting antihypertensive effect can be played by having using Neutral Grounding through Resistance in Electrical when ground fault. Since neutral resistor can adsorb a large amount of resonant energy, in the earthing mode for having resistor, system is fundamentally inhibited Resonance overvoltage.
Transformer star can directly use resistance grounded system that can install independent connect when transformer is corner connection when connecing Ground transformer, neutral resistor are attached thereto use.Using the system of resistance grounded mode when generation single phase metal ground connection Afterwards, perfect phase voltage and rise to system voltage, after being grounded tripping, three-phase voltage is promptly restored to normal value.It can make system not Understand of short duration ground connection and stops power transmission.
Embodiment 4:
The present embodiment provides a kind of singlephase earth fault management methods, comprising:
Parameter detecting: power supply line's node topology figure is established according to power distribution network power supply line unit, and real-time monitoring and display are pre- If the parameter information of node;
Failure predication and failure line selection analysis: current time or the following preset time period are analyzed according to acquisition node parameter information It is interior to whether there is fault, and whether the type of decision circuitry belongs to continuous earth failure, instantaneity ground fault or broken string Ground fault, according to the failure line selection of current failure type checking and analysis power distribution network power supply line unit.
Further, the method also includes:
Transmission efficiency monitoring: in power distribution network power supply line unit electric current and information of voltage be acquired and monitor and right The switching value of power distribution network power supply line unit is monitored.
Further, further include action delay method, specifically include:
After a feed motion occurs for power distribution network power supply line unit, the combined floodgate delay time of preset time period need to be executed;
After a separating brake movement occurs for power distribution network power supply line unit, the separating brake delay time of preset time period need to be executed;
After executing feed motion or separating brake acts, still deposited more than line fault after combined floodgate delay time or separating brake delay time Then executing new round operation.
Further, it when executing fault-line selecting method, specifically includes:
Branch drain conditions, then the data by three-phase voltage, be open voltage and branch current are accurately measured by steady state measurement Information analysis and determining branch trouble route selection.
The present embodiment of the present invention draws a neutral point in system with non effectively earth ed neutral, through grounding transformer, The neutral point and nonlinear resistance are grounded.System operates normally, isolated neutral.When system primary Ioops generate intermittence arc When light or permanent arc grounding failure, the neutral point voltage of grounding transformer is increased, and nonlinear resistance conducting, zero sequence circuit will The zero-sequence current amplified over the ground is flowed through, which is sent to master controller by fault loop acquisition unit, passes through simultaneously Dynamic captures monitor to the whole network system A, B, C three-phase voltage real-time dynamic monitoring, the variable quantity of monitoring voltage and the phase of system Parallactic angle degree discriminatory analysis selects the failure phase of system.
When intermittence arc overvoltage occurs in system, the voltage of non-faulting phase can be increased to 1.5-3.5 times, seriously affect The normal operation of system causes system to generate Instantaneous Void between Thermo over-voltage and develops into arc light, and control system monitors whole network voltage The whole network overvoltage su re or is allowed to put into after variation, the various overvoltage and intermittence arc light over-voltage that absorption system generates to protect are System, the safe operation of maintenance system.
When intermittence arc overvoltage capacity is larger, when being converted into single-phase fault ground connection or permanent singlephase earth fault When, control system monitors the variation backed off after random whole network voltage suppressor of system, and Simultaneous Switching extinguishing arc puts into elimination system arc light, Whole network voltage suppressor puts into elimination system peak overvoltage again after system arc light is eliminated, and maintenance system voltage is parallel, surely Surely equipment Supply Security is ensured.
When overvoltage fluctuation, high resistance ground or metallic earthing occurs in system, when instantaneous or permanent earth fault, it is System generates low frequency, intermediate frequency or the higher-order of oscillation and causes primary and secondary resonance, seriously affects metering and protects the stability of signal, sternly Burning, decompression tripping high pressure being protected to have a power failure for voltage transformer is caused when weight, is controlled when primary or secondary resonance occurs in system System eliminates secondary resonance, is simultaneously emitted by instruction and instant shut-in is allowed to put into, eliminate a resonance, it is ensured that system safety operation.
A specific embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention Protect range.

Claims (10)

1. a kind of singlephase earth fault management system characterized by comprising
Power distribution network power supply line unit, power distribution network power supply line unit include isolated neutral power distribution network, neutral point warp Grounding through arc power distribution network or Neutral Grounding through Resistance in Electrical power distribution network;Power distribution network power supply line unit further includes harmonic elimination electricity Road, harmonic elimination circuit are set to isolated neutral power distribution network, neutral by arc extinction coil grounding power distribution network or neutral point and connect through resistance In ground power distribution network;
Node and branch trouble prewarning unit, the node and branch trouble prewarning unit are for acquiring power distribution network power supply line list Nodal information in member, and analyzed and determined according to the nodal information of acquisition and whether there is fault;The node and branch event Barrier prewarning unit is also used to carry out early warning to fault;
Transmission efficiency monitoring unit, the transmission efficiency monitoring unit are used for the electric current and electricity in power distribution network power supply line unit Pressure information is acquired and monitors;The transmission efficiency monitoring unit be also used to the switching value of power distribution network power supply line unit into Row monitoring;
Control unit, the information and node and branch trouble that described control unit is used to be acquired according to transmission efficiency monitoring unit Data information prediction continuous earth failure, instantaneity ground fault and the complex grounding fault with interruption of prewarning unit feedback;The control Unit is also used to the accuracy according to the cell failure route selection of current failure type checking current power distribution network power supply line;
Described control unit further includes closing time time delay module and opening time time delay module, and closing time time delay module is used for Power distribution network power supply line unit provides delay operation after one-off occurs, and opening time time delay module is used for power distribution network supply lines After one-off separating brake occurs for road unit, realizes and be delayed with system recovery time, if overtime route single-phase fault still exists, Continue new round operation.
2. a kind of singlephase earth fault management system according to claim 1, which is characterized in that power distribution network power supply line unit In further include two-way voltage transformer arranged side by side, maintenance switch is additionally provided between two voltage transformers, the maintenance opens It closes for voltage transformer all the way or the connection of two-way voltage transformer or disconnects, the controller is also used to detect voltage transformer Cut-off signal.
3. a kind of singlephase earth fault management system according to claim 1 or claim 2, which is characterized in that the voltage transformer For anti-resonance potential transformer.
4. a kind of singlephase earth fault management system according to claim 1, which is characterized in that it further includes pulse route selection mould Block, the pulse route selection module are used to obtain the electric leakage situation of power distribution network power supply line, and according to three road voltage sensor voltages, Be open voltage and the judgement of branch current information and screening branch trouble route, carries out branch trouble route selection.
5. a kind of singlephase earth fault management system characterized by comprising
Power distribution network power supply line unit;
Node and branch trouble prewarning unit, the node and branch trouble prewarning unit are for acquiring power distribution network power supply line list Nodal information in member, and analyzed and determined according to the nodal information of acquisition and whether there is fault;The node and branch event Barrier prewarning unit is also used to carry out early warning to fault;
Transmission efficiency monitoring unit, the transmission efficiency monitoring unit are used for the electric current and electricity in power distribution network power supply line unit Pressure information is acquired and monitors;The transmission efficiency monitoring unit be also used to the switching value of power distribution network power supply line unit into Row monitoring;
Control unit, the information and node and branch trouble that described control unit is used to be acquired according to transmission efficiency monitoring unit Data information prediction continuous earth failure, instantaneity ground fault and the complex grounding fault with interruption of prewarning unit feedback;The control Unit is also used to the accuracy according to the cell failure route selection of current failure type checking current power distribution network power supply line;
Wherein,
Power distribution network power supply line unit is isolated neutral power distribution network;
Isolated neutral power distribution network includes electrification display, dynamic capture monitor, grounding transformer, single-phase vacuum contact Device, half-wave rectifier, current transformer, neutral point protection device, voltage transformer, wideband voltage absorber, disconnecting switch, current limliting Fuse, high-tension fuse and dynamic monitoring controller;One end of firewire is connected by disconnecting switch with electrification display, firewire One end also pass through disconnecting switch, dynamic capture monitor ground connection;One end of firewire also pass through disconnecting switch, limiting fuse, Grounding transformer, single-phase vacuum contactor, half-wave rectifier and current transformer ground connection;One end of firewire, which also passes through, to be kept apart Pass, high-tension fuse, voltage transformer and neutral point protection device ground connection;One end of firewire also passes through disconnecting switch, wideband electricity Press absorber ground connection;Dynamic monitoring controller is connected with disconnecting switch.
6. a kind of singlephase earth fault management system, which is characterized in that including power distribution network power supply line unit, node and branch event Hinder prewarning unit, transmission efficiency monitoring unit and control unit;
Wherein, power distribution network power supply line unit is Neutral Grounding through Resistance in Electrical power distribution network;
Neutral Grounding through Resistance in Electrical power distribution network includes grounding transformer, the first disconnecting switch, resistor, anti-saturation Current Mutual Inductance Device, electrification display, the second disconnecting switch, high-tension fuse, voltage transformer, antiresonance module, full voltage controller, wideband Voltage absorber and control unit;
One end of firewire also passes sequentially through grounding transformer, the first disconnecting switch, resistor, anti-saturation current transformer ground connection; One end of firewire also passes through band line display and is grounded;One end of firewire also passes through the second disconnecting switch, wideband voltage absorber connects Ground;One end of firewire also passes through the second disconnecting switch, high-tension fuse, anti-resonance potential transformer and antiresonance module ground.
7. a kind of singlephase earth fault management method, including content described in claim 1- claim 4, which is characterized in that packet It includes:
Parameter detecting: power supply line's node topology figure is established according to power distribution network power supply line unit, and real-time monitoring and display are pre- If the parameter information of node;
Failure predication and failure line selection analysis: current time or the following preset time period are analyzed according to acquisition node parameter information It is interior to whether there is fault, and whether the type of decision circuitry belongs to continuous earth failure, instantaneity ground fault or broken string Ground fault, according to the failure line selection of current failure type checking and analysis power distribution network power supply line unit.
8. a kind of singlephase earth fault management method a kind of according to claim 7, which is characterized in that the method is also wrapped It includes:
Transmission efficiency monitoring: in power distribution network power supply line unit electric current and information of voltage be acquired and monitor and right The switching value of power distribution network power supply line unit is monitored.
9. a kind of singlephase earth fault management method a kind of according to claim 7, which is characterized in that it further includes that movement is prolonged Shi Fangfa is specifically included:
After a feed motion occurs for power distribution network power supply line unit, the combined floodgate delay time of preset time period need to be executed;
After a separating brake movement occurs for power distribution network power supply line unit, the separating brake delay time of preset time period need to be executed;
After executing feed motion or separating brake acts, still deposited more than line fault after combined floodgate delay time or separating brake delay time Then executing new round operation.
10. a kind of singlephase earth fault management method a kind of according to claim 7, which is characterized in that execute failure line selection When method, specifically include:
Branch drain conditions, then the data by three-phase voltage, be open voltage and branch current are accurately measured by steady state measurement Information analysis and determining branch trouble route selection.
CN201910722336.1A 2019-08-06 2019-08-06 A kind of singlephase earth fault management system and method Pending CN110389276A (en)

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CN111025182A (en) * 2019-11-21 2020-04-17 国网河南省电力公司商丘供电公司 STM32F103T 6-based instantaneous ground fault finder
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CN112327099A (en) * 2020-10-30 2021-02-05 南方电网科学研究院有限责任公司 Power distribution network earth fault line selection tripping method and device and storage medium
CN114252735A (en) * 2021-12-21 2022-03-29 国网江苏省电力有限公司镇江供电分公司 Monitoring and judging method for 110kV line broken branch positioning
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CN111025182A (en) * 2019-11-21 2020-04-17 国网河南省电力公司商丘供电公司 STM32F103T 6-based instantaneous ground fault finder
CN111308268B (en) * 2020-02-06 2022-04-12 云南电网有限责任公司电力科学研究院 Method and system for evaluating latent fault of power distribution network equipment
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CN111755955A (en) * 2020-07-02 2020-10-09 上海市计量测试技术研究院 High-tension electricity cabinet ground protection device
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CN114252735A (en) * 2021-12-21 2022-03-29 国网江苏省电力有限公司镇江供电分公司 Monitoring and judging method for 110kV line broken branch positioning
CN114252735B (en) * 2021-12-21 2023-07-14 国网江苏省电力有限公司镇江供电分公司 Monitoring and judging method for positioning of 110kV line broken line branch
CN116466154A (en) * 2023-03-23 2023-07-21 国能大渡河流域水电开发有限公司 Fault diagnosis method and device, storage medium and electronic equipment
CN116466154B (en) * 2023-03-23 2023-12-29 国能大渡河流域水电开发有限公司 Fault diagnosis method and device, storage medium and electronic equipment
CN116780488A (en) * 2023-08-16 2023-09-19 山西迎润新能源有限公司 New energy power station grounding protection system, method, electronic equipment and storage medium
CN116780488B (en) * 2023-08-16 2023-11-14 山西迎润新能源有限公司 New energy power station grounding protection system, method, electronic equipment and storage medium
CN117013506A (en) * 2023-10-07 2023-11-07 安徽沃华电力设备有限公司 Neutral point nonlinear resistor grounding protection system and reliable line selection device
CN117013506B (en) * 2023-10-07 2023-12-01 安徽沃华电力设备有限公司 Neutral point nonlinear resistor grounding protection system and reliable line selection device

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