CN101303387A - Direct current injection type route selecting positioning system and method thereof - Google Patents

Direct current injection type route selecting positioning system and method thereof Download PDF

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CN101303387A
CN101303387A CNA2008100149966A CN200810014996A CN101303387A CN 101303387 A CN101303387 A CN 101303387A CN A2008100149966 A CNA2008100149966 A CN A2008100149966A CN 200810014996 A CN200810014996 A CN 200810014996A CN 101303387 A CN101303387 A CN 101303387A
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current
fault
grounding transformer
size
direct current
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CN101303387B (en
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高志鹏
张慧芬
熊敏
曾庆辉
曹方起
桑在中
李安洪
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University of Jinan
Sinopec Shengli Oilfield Co Linpan Oil Production Plant
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Sinopec Shengli Oilfield Co Linpan Oil Production Plant
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Abstract

The invention discloses a DC injection type route selection positioning system and a method thereof, which makes use of neutral-point voltage to ground to provide power supply for the generation of DC signal and inject DC to a fault system, and realizes faulty route selection and position by the detection of circulation of the DC signals. The structure of the invention comprises a grounding transformer, a DC generator, a control device and a fault indicator FD, wherein, the grounding transformer is connected with a system bus and injects the DC to the fault system by the primary coil of the grounding transformer; the DC generator is arranged between the primary-side neutral-point N of the grounding transformer and the ground; the control device is connected with the secondary side of bus-bar potential transformer to monitor whether a power distribution system has single-phase earth fault, control the switching of the DC, measure the injected DC at the same time and adjust the injected DC according to the measured injected DC; the fault indicator FD is positioned at the outlet of each feeder, and the fault indicator FD is also arranged at the feeder at intervals to detect the injected DC and select faulty line and locate the fault.

Description

Direct current injection type route selecting positioning system and method thereof
Technical field
The present invention relates to Earth Fault Detection technology in a kind of system for distribution network of power, the direct current injection type route selecting positioning system and the method thereof that relate in particular to a kind of isolated neutral or use through arc suppression coil earthing system.
Background technology
In China, for the power distribution network of present operation, because system neutral is earth-free or through grounding through arc, do not form short-circuit loop, the very little zero-sequence current that has only system's distributed capacitance to cause behind the generation singlephase earth fault.Both at home and abroad the various devices of searching singlephase earth fault be exactly according to these smaller fault amounts as basis for estimation, False Rate is bigger.When power distribution network normally moves, the three-phase voltage symmetry, the neutral point voltage-to-ground is zero, and during fault, system neutral voltage raises, with the difference of transition resistance, the degree difference that the neutral point voltage-to-ground raises, maximum during the metallic earthing fault can be elevated to phase voltage.The phase place of residual voltage is as the reference phase place when only having used fault in existing route selection positioning principle, and do not use the size of residual voltage.
Colleges and universities and producer release three types earthing wire-selecting locating device both at home and abroad, are respectively: the route selection locating device of reaction singlephase earth fault transient state amount, the route selection locating device of reaction singlephase earth fault steady-state quantity, the route selection locating device that utilization " injection method " principle constitutes.The defective of preceding two kinds of prior aries is: for the route selection localization method of reflection fault transient amount, the short defective that is difficult for gathering fault data of fault electric parameters life period is arranged; There is electric parameters amplitude defective less than normal in route selection localization method for reflection fault steady-state quantity, because the fault component amplitude is too little, causes criterion malfunctioning, has reduced the reliability of device.And existing " injection method " route selection positioning principle is to inject a special AC signal that is different from first-harmonic mutually from the fault of bus-bar potential transformer secondary side, needs special signal generation apparatus and signal supervisory instrument to realize the route selection and the location of singlephase earth fault.Be subjected to the restriction of voltage transformer (VT) capacity, the AC signal of being injected is smaller, and the influence of being disturbed is very big, and the detection technique of injecting signal is had relatively high expectations, and also fails to make the accuracy of route selection location to reach on-the-spot satisfied requirement.More than three class route selection locating devices when high transition Resistance Fault, accuracy rate is lower, what have can't select faulty line, can not find out the trouble spot.
Summary of the invention
Purpose of the present invention is exactly need add special signal generation apparatus and signal supervisory instrument and defective higher to the technical requirement of injecting signal supervisory instrument and that be subject to disturb in order to solve at present for injecting AC signal, the also signal of residual voltage when making full use of fault, the route selection orientation problem when solving high transition Resistance Fault also, provide a kind of behind power distribution network generation singlephase earth fault, neutral point voltage-to-ground when utilizing fault provides power supply for the generation of direct current signal, inject direct current to failure system, realize the direct current injection type route selecting positioning system and the method thereof of failure line selection and positioning function by the current intelligence that detects direct current signal.
For achieving the above object, the present invention adopts following technical scheme:
A kind of direct current injection type route selecting positioning system, it comprises grounding transformer, DC current generator, control device and fault detector FD; Wherein grounding transformer is received on the system busbar, gets the power supply of neutral point voltage-to-ground as the DC current generator when being used for the system failure, and injects direct current by the primary winding of grounding transformer to failure system; Connect the DC current generator between the neutral point N of grounding transformer primary side and the earth, control device is received the secondary side of bus-bar potential transformer, whether the monitoring distribution system singlephase earth fault takes place, and the switching of control DC current, measure to inject the size of DC current simultaneously, according to the size of the DC current of the size adjustment injection of survey DC current; Fault detector FD is installed on the outlet of every feeder line, keeps at a certain distance away on the feeder line fault detector FD also is installed, and is used for detecting the DC current of injection, selects faulty line and localization of fault.
Described DC current generator is made of silicon stack D series resistor R and fling-cut switch K, direct current measurement sensor MA, silicon stack D rectification produces DC current, and the crosstalk resistance R of institute is a current-limiting resistance, uses variable resistor, by regulating the size of current-limiting resistance, reach and adjust the purpose of injecting the DC current size; Fling-cut switch K is used to control the input and the excision of DC current; Direct current measurement sensor MA is used for measuring the size of injecting direct current, the size of regulating current-limiting resistance R according to its measured value.
A kind of route selection localization method of direct current injection type route selecting positioning system,
Singlephase earth fault when taking place in a, and grounding transformer primary side neutral point voltage-to-ground raises, along with the trouble spot transition resistance varies in size and difference, and the highest phase voltage that is elevated to, this voltage provides power supply for the constant current generator;
B control device gauge tap K closure, neutral point voltage-to-ground are added on the DC current generator and produce direct current, and inject failure system by the primary winding of grounding transformer;
C simultaneously, control device is measured the grounding transformer primary side neutral point DC current on the branch road over the ground, and regulates the size of current-limiting resistance according to the requirement of fault detector FD sensitivity, thereby makes the DC current of injected system adjusted;
The DC current that d injects forms the loop mutually and between the trouble spot in grounding transformer primary side neutral point, winding of grounding transformer, faulty line fault, promptly have only the fault of fault feeder to form path for DC current mutually, be installed on the indication situation of the fault detector FD in feeder line exit by observation, what the DC current indication was maximum is faulty line, realizes the function of failure line selection;
After e selected faulty line, along the indication situation that faulty line is observed fault detector, fault section was having indicating fault and is not having on the section of indicating fault, Here it is fault location function, and distance is more little between two fault detectors, and bearing accuracy is high more;
F works as faulty line and is selected and has found the trouble spot, and control section gauge tap K disconnects the power supply of excision DC current generator and stops direct current and injects.
The present invention is made up of grounding transformer, DC current generator, control section and fault detector FD.Grounding transformer is received on the system busbar, gets the power supply of neutral point voltage-to-ground as the DC current generator when being used for the system failure, and injects direct current by the primary winding of grounding transformer to failure system.Connect the DC current generator between the neutral point N of grounding transformer primary side and the earth, constitute by silicon stack D series resistor R and fling-cut switch K.Silicon stack D is used for rectification and produces DC current, and the crosstalk resistance R of institute is a current-limiting resistance, uses variable resistor, by regulating the size of current-limiting resistance, reaches and adjusts the purpose of injecting the DC current size; Fling-cut switch K is used to control the input and the excision of DC current.MA is the direct current measurement sensor, is used for measuring the size of injecting direct current, the size of regulating current-limiting resistance R according to its measured value.Control section is received the secondary side of bus-bar potential transformer, whether the monitoring distribution system singlephase earth fault takes place, and the switching by fling-cut switch control DC current, measure the size of injecting DC current simultaneously, according to the size adjustment current-limiting resistance of survey DC current, thus the size of the DC current that adjusting is injected.Fault detector FD is used for detecting the DC current of injection, is installed on the outlet of every feeder line, is used to select faulty line, whenever as shown in Figure 1 all install mutually, road along the line keep at a certain distance away each mutually on installing fault detector FD, be used for localization of fault.
The direct current injection type route selecting positioning principle is as follows, when power distribution network normally moves, and system's symmetry, three phase-to-ground voltages are phase voltage, grounding transformer primary side neutral point voltage-to-ground is zero, and dc generator and system disconnect, and the DC current generator is not worked.When singlephase earth fault took place, grounding transformer primary side neutral point voltage-to-ground raise, along with the trouble spot transition resistance varies in size and difference, and the highest phase voltage that is elevated to, this voltage provides power supply for the constant current generator.Detailed process is described below: when control section detects system's generation singlephase earth fault, control section gauge tap K closure, the neutral point voltage-to-ground is added on the DC current generator and produces direct current, and injects failure system by the primary winding of grounding transformer.Simultaneously, control section is measured the grounding transformer primary side neutral point DC current on the branch road over the ground, and regulates the size of current-limiting resistance according to the requirement of fault detector FD sensitivity, thereby makes the DC current of injected system adjusted.Suppose that singlephase earth fault takes place feeder line n among Fig. 1, the flow cycle of DC current is shown in Fig. 1 dotted line, as seen the DC current of Zhu Ruing forms the loop mutually and between the trouble spot in grounding transformer primary side neutral point, winding of grounding transformer, faulty line fault, promptly have only the fault of fault feeder to form path for DC current mutually, therefore observe the indication situation of the fault detector FD that is installed on the feeder line exit, what the DC current indication was maximum is faulty line, realizes the function of failure line selection.After selecting faulty line, along the indication situation that faulty line is observed fault detector, fault section is having indicating fault and is not having on the section of indicating fault, Here it is fault location function, and distance is more little between two fault detectors, and bearing accuracy is high more.When faulty line is selected and has found the trouble spot, control section gauge tap K disconnects the power supply of excision DC current generator and stops direct current and injects.
The invention has the beneficial effects as follows:
The non-vanishing characteristics of neutral point voltage-to-ground that produce when (1) utilizing fault dexterously allow it provide power supply for direct-flow signal generator, and utilize the primary winding of grounding transformer that direct current is injected failure system;
(2) because the DC current of injecting only has flow cycle mutually in the fault of faulty line, so have DC current to flow through in the faulty line and do not have DC current to flow through in the non-fault line, make failure criterion significant difference between faulty line and the non-fault line, thereby improved the order of accuarcy of route selection;
(3) characteristics according to the DC current flow cycle can realize localization of fault, and utilization of the present invention realizes localization of fault in each method that fault detector is installed that keeps at a certain distance away on mutually of circuit;
(4) the route selection orientation problem in the time of can solving high transition Resistance Fault;
(5) regulate the size of injecting DC current adaptively according to the requirement of fault detector detection DC current sensitivity, both satisfied the requirement of detection sensitivity, do not make the DC current that flows through on the circuit excessive again.
Description of drawings
Fig. 1 is a system architecture synoptic diagram of the present invention.
Wherein, 1. grounding transformer, 2. control device, 3. voltage transformer (VT), 4. fault detector FD.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, direct current injection type route selecting positioning system comprises grounding transformer 1, DC current generator, control device 2 and fault detector FD4; Wherein grounding transformer 1 is received on the system busbar, gets the power supply of neutral point voltage-to-ground as the DC current generator when being used for the system failure, and injects direct current by the primary winding of grounding transformer 1 to failure system; Connect the DC current generator between the neutral point N of grounding transformer 1 primary side and the earth, control device 2 is received the secondary side of bus-bar potential transformer 3, whether the monitoring distribution system singlephase earth fault takes place, and the switching of control DC current, measure to inject the size of DC current simultaneously, according to the size of the DC current of the size adjustment injection of survey DC current; Fault detector FD 4 is installed on the outlet of every feeder line, keeps at a certain distance away on the feeder line fault detector FD also is installed, and is used for detecting the DC current of injection, selects faulty line and localization of fault.
The DC current generator is made of silicon stack D series resistor R and fling-cut switch K, direct current measurement sensor MA, silicon stack D rectification produces DC current, and the crosstalk resistance R of institute is a current-limiting resistance, uses variable resistor, by regulating the size of current-limiting resistance, reach and adjust the purpose of injecting the DC current size; Fling-cut switch K is used to control the input and the excision of DC current; Direct current measurement sensor MA is used for measuring the size of injecting direct current, the size of regulating current-limiting resistance R according to its measured value.
A kind of route selection localization method of direct current injection type route selecting positioning system,
Singlephase earth fault when taking place in a, and grounding transformer primary side neutral point voltage-to-ground raises, along with the trouble spot transition resistance varies in size and difference, and the highest phase voltage that is elevated to, this voltage provides power supply for the constant current generator;
B control device gauge tap K closure, neutral point voltage-to-ground are added on the DC current generator and produce direct current, and inject failure system by the primary winding of grounding transformer;
C simultaneously, control device is measured the grounding transformer primary side neutral point DC current on the branch road over the ground, and regulates the size of current-limiting resistance according to the requirement of fault detector FD sensitivity, thereby makes the DC current of injected system adjusted;
The DC current that d injects forms the loop mutually and between the trouble spot in grounding transformer primary side neutral point, winding of grounding transformer, faulty line fault, promptly have only the fault of fault feeder to form path for DC current mutually, be installed on the indication situation of the fault detector FD in feeder line exit by observation, what the DC current indication was maximum is faulty line, realizes the function of failure line selection;
After e selected faulty line, along the indication situation that faulty line is observed fault detector, fault section was having indicating fault and is not having on the section of indicating fault, Here it is fault location function, and distance is more little between two fault detectors, and bearing accuracy is high more;
F works as faulty line and is selected and has found the trouble spot, and control section gauge tap K disconnects the power supply of excision DC current generator and stops direct current and injects.
The present invention not detailed description is known technology, repeats no more.
Embodiment 1:
In certain oil recovery factory one electric substation the direct current injection type route selecting positioning principle has been carried out earth test to high transition resistance situation, record is as table 1.
As can be seen from Table 1, when transition resistance was higher, the injection DC current that the trouble spot is flow through was bigger, can satisfy the requirement of fault detector accuracy of detection.Along with the increase of transition resistance, the injection direct current that the trouble spot is flow through reduces, but also can satisfy the requirement of detection sensitivity.
It can also be seen that from table 1, when DC current current-limiting resistance that generator is gone here and there changes, to injecting the big or small influential of DC current, along with the increase of institute's crosstalk resistance, DC current generator output direct current reduces, and current-limiting resistance has played the effect of injecting the DC current size of regulating, but when one timing of transition resistance, little to trouble spot DC current influence, therefore inject less DC current, also can guarantee on the faulty line accuracy of detection requirement to DC current.
The test data sheet of table 12008 ground connection project on 17, Sun. of on February
Figure A20081001499600061

Claims (3)

1, a kind of direct current injection type route selecting positioning system is characterized in that: it comprises grounding transformer, DC current generator, control device and fault detector FD; Wherein grounding transformer is received on the system busbar, gets the power supply of neutral point voltage-to-ground as the DC current generator when being used for the system failure, and injects direct current by the primary winding of grounding transformer to failure system; Connect the DC current generator between the neutral point N of grounding transformer primary side and the earth, control device is received the secondary side of bus-bar potential transformer, whether the monitoring distribution system singlephase earth fault takes place, and the switching of control DC current, measure to inject the size of DC current simultaneously, according to the size of the DC current of the size adjustment injection of survey DC current; Fault detector FD is installed on the outlet of every feeder line, keeps at a certain distance away on the feeder line fault detector FD also is installed, and is used for detecting the DC current of injection, selects faulty line and localization of fault.
2, direct current injection type route selecting positioning system according to claim 1, it is characterized in that: described DC current generator is made of silicon stack D series resistor R and fling-cut switch K, direct current measurement sensor MA, silicon stack D rectification produces DC current, the crosstalk resistance R of institute is a current-limiting resistance, use variable resistor, by regulating the size of current-limiting resistance, reach and adjust the purpose of injecting the DC current size; Fling-cut switch K is used to control the input and the excision of DC current; Direct current measurement sensor MA is used for measuring the size of injecting direct current, the size of regulating current-limiting resistance R according to its measured value.
3, the route selection localization method of the described direct current injection type route selecting positioning system of a kind of claim 1 is characterized in that:
Singlephase earth fault when taking place in a, and grounding transformer primary side neutral point voltage-to-ground raises, along with the trouble spot transition resistance varies in size and difference, and the highest phase voltage that is elevated to, this voltage provides power supply for the constant current generator;
B control device gauge tap K closure, neutral point voltage-to-ground are added on the DC current generator and produce direct current, and inject failure system by the primary winding of grounding transformer;
C simultaneously, control device is measured the grounding transformer primary side neutral point DC current on the branch road over the ground, and regulates the size of current-limiting resistance according to the requirement of fault detector FD sensitivity, thereby makes the DC current of injected system adjusted;
The DC current that d injects forms the loop mutually and between the trouble spot in grounding transformer primary side neutral point, winding of grounding transformer, faulty line fault, promptly have only the fault of fault feeder to form path for DC current mutually, be installed on the indication situation of the fault detector FD in feeder line exit by observation, what the DC current indication was maximum is faulty line, realizes the function of failure line selection;
After e selected faulty line, along the indication situation that faulty line is observed fault detector, fault section was having indicating fault and is not having on the section of indicating fault, Here it is fault location function, and distance is more little between two fault detectors, and bearing accuracy is high more;
F works as faulty line and is selected and has found the trouble spot, and control section gauge tap K disconnects the power supply of excision DC current generator and stops direct current and injects.
CN2008100149966A 2008-04-09 2008-04-09 Direct current injection type route selecting positioning system and method thereof Expired - Fee Related CN101303387B (en)

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CN102435911A (en) * 2011-09-20 2012-05-02 江苏省电力公司宿迁供电公司 Automatic positioning system for single-phase earth fault of distribution line
CN102455399A (en) * 2010-10-18 2012-05-16 黄洪全 Tracking and locating device for earth fault of overhead line
CN102508119A (en) * 2011-12-09 2012-06-20 江苏镇安电力设备有限公司 Method for positioning earth faults of parallel loop of IT (Isolation-Terre) power system
CN102540009A (en) * 2010-12-23 2012-07-04 上海蓝瑞电气有限公司 Fault locating system of power distribution network
CN102565612A (en) * 2011-12-29 2012-07-11 陶永茂 Substation bus fault and insulation automatic detecting device
CN102623976A (en) * 2012-03-23 2012-08-01 上海市电力公司 Combined type grounding system of reactor and resistor in power distribution network
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CN103558506A (en) * 2013-10-25 2014-02-05 国家电网公司 Method and device for searching for ground faults of non-injection type direct current system
CN104251959A (en) * 2014-09-18 2014-12-31 云南电网公司电力科学研究院 Method and device for positioning and detecting single-phase grounding fault of power distribution grid
CN104880647A (en) * 2015-06-15 2015-09-02 中国矿业大学 Earth fault phase identification method based on injection method
CN105322528A (en) * 2014-06-30 2016-02-10 中国石油大学(华东) Injection current two-point calculation method during small-current grounding fault active arc extinguishing
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CN102455399A (en) * 2010-10-18 2012-05-16 黄洪全 Tracking and locating device for earth fault of overhead line
CN102455399B (en) * 2010-10-18 2015-12-16 黄洪全 Overhead transmission line earth fault seeks track locating device
CN102540009A (en) * 2010-12-23 2012-07-04 上海蓝瑞电气有限公司 Fault locating system of power distribution network
CN102435911A (en) * 2011-09-20 2012-05-02 江苏省电力公司宿迁供电公司 Automatic positioning system for single-phase earth fault of distribution line
CN102508119A (en) * 2011-12-09 2012-06-20 江苏镇安电力设备有限公司 Method for positioning earth faults of parallel loop of IT (Isolation-Terre) power system
CN102508119B (en) * 2011-12-09 2013-11-06 江苏宏安变压器有限公司 Method for positioning earth faults of parallel loop of IT (Isolation-Terre) power system
CN102565612B (en) * 2011-12-29 2014-04-30 陶永茂 Substation bus fault and insulation automatic detecting device
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CN103207350A (en) * 2012-01-17 2013-07-17 成都信息工程学院 Low voltage direct current power distribution fault line selection method
CN102623976A (en) * 2012-03-23 2012-08-01 上海市电力公司 Combined type grounding system of reactor and resistor in power distribution network
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CN103278737A (en) * 2013-04-25 2013-09-04 河北兆联电气设备科技有限公司 Direct-current self-injection type small-current grounding and route selecting system and method
CN103558506A (en) * 2013-10-25 2014-02-05 国家电网公司 Method and device for searching for ground faults of non-injection type direct current system
CN103558506B (en) * 2013-10-25 2016-06-15 国家电网公司 Non-implanted formula DC system earth fault lookup method and device thereof
CN105322528B (en) * 2014-06-30 2019-01-11 中国石油大学(华东) Two point calculating method of Injection Current when small current grounding fault active extinguishing arc
CN105322528A (en) * 2014-06-30 2016-02-10 中国石油大学(华东) Injection current two-point calculation method during small-current grounding fault active arc extinguishing
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CN111398730A (en) * 2020-03-01 2020-07-10 华中科技大学 Power distribution network based on passive injection direct current signal and fault identification method thereof
CN111624444A (en) * 2020-06-05 2020-09-04 昆明品启科技有限公司 Distribution line ground fault positioning method and device
CN112986862A (en) * 2021-04-27 2021-06-18 重庆大学 Single-phase earth fault identification method of small current grounding system
CN112986862B (en) * 2021-04-27 2024-04-09 重庆大学 Power distribution network fault indicator sensitivity improving method based on neutral point resistance control

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