CN103207352B - Route selection impedance magnitude characteristic is utilized to realize wire selection method for power distribution network single phase earthing failure - Google Patents

Route selection impedance magnitude characteristic is utilized to realize wire selection method for power distribution network single phase earthing failure Download PDF

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CN103207352B
CN103207352B CN201310079876.5A CN201310079876A CN103207352B CN 103207352 B CN103207352 B CN 103207352B CN 201310079876 A CN201310079876 A CN 201310079876A CN 103207352 B CN103207352 B CN 103207352B
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distribution network
power distribution
route selection
feeder line
feeder
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CN103207352A (en
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林富洪
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
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Abstract

The invention discloses one utilizes route selection impedance magnitude characteristic to realize wire selection method for power distribution network single phase earthing failure.The method measures power distribution network bus residual voltage and each feeder line zero-sequence current; Bus phase voltage amplitude when if the power distribution network that power distribution network bus residual voltage amplitude is greater than 0.15 times normally runs, then keep arc suppression coil parameter constant switching parallel resistance, again measure power distribution network bus residual voltage and each feeder line zero-sequence current; Calculate the route selection impedance magnitude of each feeder line of power distribution network, the route selection impedance magnitude utilizing normal feeder line corresponding carries out Single-phase Earth-fault Selection in Distribution Systems for the route selection impedance magnitude infinitely great, fault feeder is corresponding equals this route selection impedance magnitude characteristic of parallel resistance value.The failure line selection performance of the inventive method does not affect by factors such as feeder line type, abort situation, feeder line parameter, transition resistance and feed line length, during power distribution network single-phase high-impedance, the inventive method can reliably correct route selection, adapt to Complicated Distribution Network running environment, there is good engineering practical value.

Description

Route selection impedance magnitude characteristic is utilized to realize wire selection method for power distribution network single phase earthing failure
Technical field
The present invention relates to system for distribution network of power failure line selection technical field, specifically relate to one and utilize route selection impedance magnitude characteristic to realize wire selection method for power distribution network single phase earthing failure.
Background technology
After distribution feeder singlephase earth fault, because arc suppression coil provides the compensating action of inductance current, cause the zero-sequence current amount flowing through fault feeder very little, fault signature is not obvious, makes to choose distribution network failure feeder line and there is larger difficulty.The distribution feeder method proposed at present is mainly divided into steady state method and transient method.The stable state fundamental frequency that steady state method mainly adopts distribution feeder single-phase earthing to produce or each harmonic wave electric signal complete failure line selection function, because fault signature this key factor not obvious by the single-phase high resistance ground of distribution feeder affects, the method often route selection failure, can not adapt to practical demand.Transient method according to the transient state component of fault zero-sequence current much larger than the feature of steady-state quantity, failure line selection function is completed in conjunction with transient state zero mode voltage utilized in certain selected frequency band and electric current, route selection correctness is high, but the reliability requirement of transient method to hardware and algorithm is too high, complicated power distribution network environment cannot be adapted to, practical demand can not be adapted to.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, provide a kind of reliable correct route selection, the route selection impedance magnitude characteristic that utilizes adapting to Complicated Distribution Network running environment realizes wire selection method for power distribution network single phase earthing failure.
The object of the invention is to be realized by following approach:
Utilize route selection impedance magnitude characteristic to realize wire selection method for power distribution network single phase earthing failure, its main points are, comprise the steps:
(1) provide a kind of measurement mechanism, it measures power distribution network bus residual voltage with each feeder line zero-sequence current if be greater than then switching parallel resistance, measures power distribution network bus residual voltage again with each feeder line zero-sequence current wherein, i is i-th feeder line numbering, i=1 ..., n, n are distribution feeder number, for bus phase voltage when power distribution network normally runs; Parallel resistance is connected in parallel with arc suppression coil on electrical structure;
(2) provide a kind of data processing equipment, its data measured according to measurement mechanism calculate the route selection impedance of each feeder line of power distribution network successively from 1 to n to i wherein, i is i-th feeder line numbering, i=1 ..., n, n are distribution feeder number;
(3) data processing equipment sets the resistance value Z that adjusts set, choose route selection impedance magnitude and meet corresponding distribution feeder is fault feeder; Wherein, i is i-th feeder line numbering, i=1 ..., n, n are distribution feeder number.
The present invention compared with prior art, has following positive achievement:
The inventive method route selection impedance magnitude corresponding according to normal feeder line is that the route selection impedance magnitude infinitely great, fault feeder is corresponding equals this route selection impedance magnitude characteristic of parallel resistance value and realizes Single-phase Earth-fault Selection in Distribution Systems, route selection performance does not affect by factors such as feeder line type, abort situation, feeder line parameter, transition resistance and feed line length, during power distribution network single-phase high-impedance, the inventive method can reliably correct route selection, adapt to Complicated Distribution Network running environment, there is good engineering practical value.
Accompanying drawing explanation
Fig. 1 is the one-phase earthing failure in electric distribution network zero sequence sequence diagrams before the parallel resistance switching of application the inventive method.
Fig. 2 is the one-phase earthing failure in electric distribution network zero sequence sequence diagrams after the parallel resistance switching of application the inventive method.
Embodiment
According to Figure of description, technical scheme of the present invention is expressed in further detail below.
The present embodiment sets forth technical solution of the present invention further for power distribution network n-th feeder line generation singlephase earth fault of neutral by arc extinction coil grounding.
Fig. 1 is the one-phase earthing failure in electric distribution network zero sequence sequence diagrams before parallel resistance switching.In Fig. 1 for power distribution network bus injects the zero-sequence current of arc suppression coil.Measure power distribution network bus residual voltage measure the 1st, zero-sequence current that 2 ..., n-1, n bar feeder line flow through wherein, n is distribution feeder number.
If be greater than switching parallel resistance R; Wherein, power distribution network bus phase voltage during for normally running, parallel resistance R is connected in parallel with arc suppression coil L on electrical structure.
Fig. 2 is the one-phase earthing failure in electric distribution network zero sequence sequence diagrams after parallel resistance switching.In Fig. 2 for the power distribution network bus after parallel resistance switching injects the zero-sequence current of arc suppression coil and parallel resistance.Measure power distribution network bus residual voltage measure the 1st, zero-sequence current that 2 ..., n-1, n bar feeder line flow through wherein, n is distribution feeder number.
Calculate the route selection impedance magnitude of the power distribution network the 1st after parallel resistance R switching, 2 ..., n-1, n bar feeder line:
| Z 1 | = | U · 0 2 I · 01 2 - U · 0 2 U · 0 1 I · 01 1 | = | U · 0 2 I · 01 2 - U · 0 2 U · 0 1 Y 01 U · 0 1 | = | U · 0 2 | | U · 0 2 Y 01 - U · 0 2 Y 01 | = | U · 0 2 | 0 = ∞
| Z 2 | = | U · 0 2 I · 02 2 - U · 0 2 U · 0 1 I · 02 1 | = | U · 0 2 I · 02 2 - U · 0 2 U · 0 1 Y 02 U · 0 1 | = | U · 0 2 | | U · 0 2 Y 02 - U · 0 2 Y 02 | = | U · 0 2 | 0 = ∞
| Z 3 | = | U · 0 2 I · 03 2 - U · 0 2 U · 0 1 I · 03 1 | = | U · 0 2 I · 03 2 - U · 0 2 U · 0 1 Y 03 U · 0 1 | = | U · 0 2 | | U · 0 2 Y 03 - U · 0 2 Y 03 | = | U · 0 2 | 0 = ∞
……
| Z n - 1 | = | U · 0 2 I · 0 n - 1 2 - U · 0 2 U · 0 1 I · 0 n - 1 1 | = | U · 0 2 I · 0 n - 1 2 - U · 0 2 U · 0 1 Y 0 n - 1 U · 0 1 | = | U · 0 2 | | U · 0 2 Y 0 n - 1 - U · 0 2 Y 0 n - 1 | = | U · 0 2 | 0 = ∞
| Z n | = | U · 0 2 I · 0 n 2 - U · 0 2 U · 0 1 I · 0 n 1 | = | U · 0 2 | | - U · 0 2 R | = R - - - ( 1 )
Wherein, R is parallel resistance; Y 01, Y 02, Y 03..., Y 0n-1respectively represent the 1st, 2,3 ..., n-1 bar feeder line admittance over the ground.
As the above analysis, 1st, 2 ..., route selection impedance magnitude that n-1 bar feeder line is corresponding are infinitely great numerical value, article n-th, the route selection impedance magnitude that feeder line is corresponding equals parallel resistance value, namely the route selection impedance magnitude that normal feeder line is corresponding is infinitely great numerical value, the route selection impedance magnitude that fault feeder is corresponding equals parallel impedance value, and therefore the inventive method utilizes this amplitude characteristic of route selection impedance formation distribution network fault line selection criterion as follows:
| Z i | = | U &CenterDot; 0 2 I &CenterDot; 0 i 2 - U &CenterDot; 0 2 U &CenterDot; 0 1 I &CenterDot; 0 i 1 | < Z set ,
Wherein, Z setfor resistance value of adjusting, i is i-th feeder line numbering, i=1 ..., n, n are distribution feeder number, so, choose route selection impedance magnitude and meet corresponding distribution feeder is fault feeder.
The inventive method route selection impedance magnitude corresponding according to normal feeder line is that the route selection impedance magnitude infinitely great, fault feeder is corresponding equals this route selection impedance magnitude characteristic of parallel resistance value and realizes Single-phase Earth-fault Selection in Distribution Systems, route selection performance does not affect by factors such as feeder line type, abort situation, feeder line parameter, transition resistance and feed line length, during power distribution network single-phase high-impedance, the inventive method can reliably correct route selection, adapt to Complicated Distribution Network running environment, there is good engineering practical value.
The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.

Claims (1)

1. utilize route selection impedance magnitude characteristic to realize wire selection method for power distribution network single phase earthing failure, it is characterized in that, comprise the following steps:
(1) provide a kind of measurement mechanism, it measures power distribution network bus residual voltage with each feeder line zero-sequence current if be greater than then switching parallel resistance, measures power distribution network bus residual voltage again with each feeder line zero-sequence current wherein, i is i-th feeder line numbering, i=1 ..., n, n are distribution feeder number, for bus phase voltage when power distribution network normally runs; Parallel resistance is connected in parallel with arc suppression coil on electrical structure;
(2) provide a kind of data processing equipment, its data measured according to measurement mechanism calculate the route selection impedance of each feeder line of power distribution network successively from 1 to n to i wherein, i is i-th feeder line numbering, i=1 ..., n, n are distribution feeder number;
(3) data processing equipment sets the resistance value Z that adjusts set, choose route selection impedance magnitude and meet corresponding distribution feeder is fault feeder; Wherein, i is i-th feeder line numbering, i=1 ..., n, n are distribution feeder number.
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CN104849615B (en) * 2015-05-15 2018-06-19 国家电网公司 Distribution earth fault detection for power is realized using virtual current comparison principle
CN104849617B (en) * 2015-05-15 2018-10-16 国家电网公司 Distribution earth fault detection for power is realized using virtual power maximum principle
CN104849616B (en) * 2015-05-15 2018-10-16 国家电网公司 Based on virtual power comparison principle distribution fault line selection method for single-phase-to-ground fault
CN105445616B (en) * 2015-11-16 2018-08-07 西安交通大学 A kind of Little Current Ground Connection System and method based on controlled zero-sequence current
CN105866608A (en) * 2016-03-23 2016-08-17 国网福建省电力有限公司 Power distribution network fault line selection method based on unique through-flow characteristic of resistive current
CN107064729B (en) * 2016-12-14 2019-09-17 国家电网公司 Arc suppression coil earthing system single-phase grounding selecting method
CN106872857A (en) * 2017-03-13 2017-06-20 安徽天电气技术股份有限公司 A kind of residual voltage drives the ground fault line selection device of zero-sequence current
CN108732467A (en) * 2018-08-09 2018-11-02 安徽亚辉电气自动化有限公司 A kind of one-phase earthing failure in electric distribution network detection positioning system
CN110118912B (en) * 2019-04-23 2022-02-01 武汉理工大学 Grey correlation analysis-based single-phase earth fault line selection method for arc suppression coil device-grounded power distribution network
CN110212511B (en) * 2019-06-28 2021-03-12 中国能源建设集团辽宁电力勘测设计院有限公司 66kV arc suppression coil grounding system based on resistance remote automatic switching
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