CN101042417A - Modelling method and route selecting method for single-phase grounding of low current neutral grounding system - Google Patents

Modelling method and route selecting method for single-phase grounding of low current neutral grounding system Download PDF

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CN101042417A
CN101042417A CN 200610073416 CN200610073416A CN101042417A CN 101042417 A CN101042417 A CN 101042417A CN 200610073416 CN200610073416 CN 200610073416 CN 200610073416 A CN200610073416 A CN 200610073416A CN 101042417 A CN101042417 A CN 101042417A
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resistance
fault
switch
ground
phase
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CN100590442C (en
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吴昌德
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吴昌德
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Abstract

This invention relates to one electric mode to generate single phase earth connection fault and the fault earth wire selection method by use of the module, wherein, the electric mode is taken place by the earth connection point switch, variable resistance element and parallel switch element discharge gap series to analogue single earth fault development process by interval of electric arc, resistance, low resistance and metal property; the method is to use zero sequence current transfer method to connect one adjustable resistance in between to judge the fault circuit according to the fault circuit and non-fault zero non-fault current change trends.

Description

The modeling method of single-phase earthing of small current earthing system and selection method
The present invention relates to be used in the method for setting up electrical model and definite faulty line when in the small current neutral grounding system singlephase earth fault taking place.
China 3-66kV distribution system adopts the small current neutral grounding system of isolated neutral usually, this mode can guarantee to continue power supply a period of time when system's generation singlephase earth fault, if but could not find faulty line excision in time just might make that single-phase earthing is expanded into line to line fault as early as possible, would bring threat for the safe operation of system.Therefore wish to find faulty line accurately and rapidly, so that take measures to eliminate fault, the assurance system normally moves.Be commonly used to determine that the method for faulty line can be divided three classes: the first kind be system electrical parameter during with stable state as criterion, comprise zero-sequence current, real component, zero sequence admittance, negative-sequence current etc.; Second class is to be criterion with the system electrical parameter in the fault generation transient state process, comprises first half-wave method, protecting energy method, wavelet analysis method etc.; The 3rd class is an additive method, comprises signal injection method, non-direct electrical quantities measurement method etc.But the operation practice shows, existing these faulty line decision methods can accurately not judged faulty line at present, this mainly is because the complicacy of system, the uncertainty of the method for operation and singlephase earth fault process and little current signal accurately measure difficulty caused, electrical model commonly used all is simply earth point to be handled by resistive short as metallic short circuit usually, intermittent arc grounding process when this can not illustrate small current neutral grounding system generation singlephase earth fault and the transient process from the intermittent arc grounding to the metallic earthing, the present invention will provide a kind of new more near the single-phase grounded malfunction in grounded system of low current modeling method of actual conditions and the fault line selection method for single-phase-to-ground fault that adopts this model analysis.
The model of single-phase grounded malfunction in grounded system of low current provided by the invention is such: the process of representing fault ground at fault ground point with the discharging gap of K switch 2, paralleling switch K1 and the series connection of variable resistor three set of pieces, wherein K switch 2 is closed and is represented that earth fault takes place, folding operation expression intermittent defect, discharging gap punctures expression arcing ground fault, K switch 1 is closed and is represented that arcing ground becomes resistance eutral grounding, and the variable resistor resistance is represented from large to small by the transient process of resistance eutral grounding to metallic earthing.
Because the present invention has considered the overall process of singlephase earth fault by intermittent electric arc-high resistant-low-resistance-metallic earthing, simulate this process at earth point with combination of elements such as switch, discharging gap and variable resistors, model is convenient to theoretical research and breadboard simulated experiment more near real process.
Below in conjunction with accompanying drawing the method that the present invention proposes is explained.
Accompanying drawing 1 is an electrical principle synoptic diagram of the present invention.
Fig. 1 represents to have the distribution system zero-sequence network of three outlets, C 01, C 02, C 03Singlephase earth fault, V take place at the D of No. 01 outlet point in the ground capacitance of representing three outlets respectively 0Represent the zero sequence power supply, on-off element K2 closes and represents to take place earth fault, and discharging gap JX punctures expression electric arc earth fault, and on-off element K1 closes and represents that electric arc earth fault becomes the resistive ground fault, variable resistor R JdRepresent different ground connection transition resistances, descending adjusting variable resistor R JdCan represent the fault ground process by high resistant to low-resistance at last to the process of metallic earthing.
Embodiment is equally with reference to accompanying drawing 1.
Use the equivalent ground capacitance of lumped capacitance representative system respectively, press the size of zero-sequence current and select different switches, variable-resistance maximal value can be chosen by a kilo-ohm level usually, and discharging gap selects distance between adjustable clearance, presses Fig. 1 wiring and gets final product.
Fault-line selecting method provided by the invention is such: behind system's generation singlephase earth fault, between the bus of ground connection phase and ground, insert the resistance that to regulate resistance, regulate resistance value gradually, then different variations will take place in the zero-sequence current of each bar outlet, rule is: resistance value is when diminishing greatly gradually, and the zero-sequence current of faulty line reduces gradually, oppositely increases after the zero passage, the zero-sequence current of non-fault line will increase gradually, and resistance value becomes gradually when big by little that then variation tendency is opposite.Can judge the circuit that earth fault takes place according to the faulty line zero-sequence current variation tendency different with non-fault line.
Because the present invention adopts and insert variable resistor between system busbar and ground, the fault current of regulating the big young pathbreaker trouble spot of resistance value shifts gradually, the method of coming the failure judgement circuit according to the different zero-sequence current variation tendency of each bar outlet, route selection is reliable, greatly reduce requirement, wide accommodation to measuring accuracy.
Below in conjunction with accompanying drawing the method that the present invention proposes is explained.
Accompanying drawing 2 is electrical principle schematic diagrames of the present invention.
Singlephase earth fault, the CURRENT DISTRIBUTION when zero-sequence current does not shift take place in Fig. 2 (a), to the 1# faulty line, at outlet zero-sequence current I1-mFlow to bus by fault phase, to 2# and 3# non-fault line, zero-sequence current I0-2And I0-3Then flow to circuit by bus. Fig. 2 (b) is the electric current branch after zero-sequence current shifts Cloth, this moment, K switch was closed, and the resistance of resistance R zy, the zero sequence electricity of healthy phases are shifted in descending adjusting Stream keeps original direction, and the fault current of earth point is transferred to gradually the series connection of switch and transfer resistance and propped up Road, the zero-sequence current of fault phase then flow to bus by fault phase and become by bus and flow to circuit, according to this Variation tendency together, accurately failure judgement circuit.

Claims (6)

1: the electrical model of single-phase grounded malfunction in grounded system of low current and the selection method of single-phase grounded malfunction in grounded system of low current.Single-phase ground fault line selecting method of small-electric current grounding system is characterized as the resistance in series that is connected to switch and scalable resistance between system busbar and ground.
2: device according to claim 1, it is characterized in that switch closes when system's generation singlephase earth fault, regulate resistance, the different zero-sequence current variation tendency failure judgement circuit of each bar outlet when changing according to resistance.
The feature of the electrical model of single-phase grounded malfunction in grounded system of low current is
3: between the ground connection phase and ground by switch 2, the expression malfunction of connecting with the discharging gap of switch 1 parallel connection and variable resistor.
4: device according to claim 3 is characterized in that singlephase earth fault takes place in switch 2 expression of closing.
5: device according to claim 3, it is characterized in that switch 1 disconnects, discharging gap punctures expression electric arc ground connection is taken place, switch 1 closes and represents to take place resistive ground.
6: device according to claim 3 is characterized in that regulating resistance and represents to have the transient process of high resistance ground to low-impedance earthed system, metallic earthing.
CN200610073416A 2006-03-26 2006-03-26 Modelling method and route selecting method for single-phase grounding of low current neutral grounding system Expired - Fee Related CN100590442C (en)

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CN200610073416A CN100590442C (en) 2006-03-26 2006-03-26 Modelling method and route selecting method for single-phase grounding of low current neutral grounding system

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CN200610073416A CN100590442C (en) 2006-03-26 2006-03-26 Modelling method and route selecting method for single-phase grounding of low current neutral grounding system

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CN100590442C CN100590442C (en) 2010-02-17

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865967A (en) * 2010-06-18 2010-10-20 广州智光电气股份有限公司 Device for single-phase earth fault line selection and method thereof
CN102236061A (en) * 2010-04-23 2011-11-09 吴昌德 Method for verifying single-phase grounded fault phase of small current grounding system
CN102331544A (en) * 2011-07-28 2012-01-25 广东电网公司电力科学研究院 Method for distinguishing high resistance grounding failure and metallic grounding failure of power transmission line
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
CN102508937A (en) * 2011-09-23 2012-06-20 四川电力科学研究院 Transient-state grounding body modeling method
CN102540010A (en) * 2010-12-29 2012-07-04 吴昌德 Test method for selecting lines by zero-sequence current gradual transfer in low current ground system
CN103267928A (en) * 2013-04-27 2013-08-28 王鹏 Low-current system single-phase earth fault line selection control circuit
CN103645410A (en) * 2013-12-17 2014-03-19 国家电网公司 Dynamic simulation system and method of small current grounding systems in power grid
CN103837798A (en) * 2014-03-15 2014-06-04 李景禄 Quick diagnostic method and processing device of power distribution network single-phase earth fault characters
CN103852693A (en) * 2014-03-26 2014-06-11 马善娟 Judging method of small current grounding line selection system
CN105067953A (en) * 2015-08-06 2015-11-18 国网天津市电力公司 Addressing method for single-phase ground fault of low-current grounding system
CN105067952A (en) * 2015-08-06 2015-11-18 国网天津市电力公司 Addressing system for single-phase ground fault of low-current grounding system
CN110045221A (en) * 2019-05-06 2019-07-23 天地(常州)自动化股份有限公司 Small current neutral grounding simulated testing system and test method
CN110146783A (en) * 2019-05-15 2019-08-20 上海宏力达信息技术股份有限公司 A kind of fault section location method

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102236061A (en) * 2010-04-23 2011-11-09 吴昌德 Method for verifying single-phase grounded fault phase of small current grounding system
CN101865967A (en) * 2010-06-18 2010-10-20 广州智光电气股份有限公司 Device for single-phase earth fault line selection and method thereof
CN102540010A (en) * 2010-12-29 2012-07-04 吴昌德 Test method for selecting lines by zero-sequence current gradual transfer in low current ground system
CN102331544A (en) * 2011-07-28 2012-01-25 广东电网公司电力科学研究院 Method for distinguishing high resistance grounding failure and metallic grounding failure of power transmission line
CN102331544B (en) * 2011-07-28 2014-01-22 广东电网公司电力科学研究院 Method for distinguishing high resistance grounding failure and metallic grounding failure of power transmission line
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
CN102508937A (en) * 2011-09-23 2012-06-20 四川电力科学研究院 Transient-state grounding body modeling method
CN103267928B (en) * 2013-04-27 2015-04-22 王鹏 Low-current system single-phase earth fault line selection control circuit
CN103267928A (en) * 2013-04-27 2013-08-28 王鹏 Low-current system single-phase earth fault line selection control circuit
CN103645410A (en) * 2013-12-17 2014-03-19 国家电网公司 Dynamic simulation system and method of small current grounding systems in power grid
CN103645410B (en) * 2013-12-17 2016-05-25 国家电网公司 The dynamic simulator system of small current neutral grounding system and method in a kind of electrical network
CN103837798A (en) * 2014-03-15 2014-06-04 李景禄 Quick diagnostic method and processing device of power distribution network single-phase earth fault characters
CN103852693A (en) * 2014-03-26 2014-06-11 马善娟 Judging method of small current grounding line selection system
CN103852693B (en) * 2014-03-26 2017-07-28 陈玉金 A kind of determination methods of Little Current Ground Connection System
CN105067953A (en) * 2015-08-06 2015-11-18 国网天津市电力公司 Addressing method for single-phase ground fault of low-current grounding system
CN105067952A (en) * 2015-08-06 2015-11-18 国网天津市电力公司 Addressing system for single-phase ground fault of low-current grounding system
CN110045221A (en) * 2019-05-06 2019-07-23 天地(常州)自动化股份有限公司 Small current neutral grounding simulated testing system and test method
CN110146783A (en) * 2019-05-15 2019-08-20 上海宏力达信息技术股份有限公司 A kind of fault section location method

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