CN103823160B - Power distribution network adaptive earthing selection method and device - Google Patents
Power distribution network adaptive earthing selection method and device Download PDFInfo
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- CN103823160B CN103823160B CN201410094705.4A CN201410094705A CN103823160B CN 103823160 B CN103823160 B CN 103823160B CN 201410094705 A CN201410094705 A CN 201410094705A CN 103823160 B CN103823160 B CN 103823160B
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- 238000010187 selection method Methods 0.000 title claims abstract description 23
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 7
- 230000035945 sensitivity Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000007935 neutral effect Effects 0.000 claims abstract description 20
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 6
- 230000001629 suppression Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The present invention is power distribution network adaptive earthing selection method, and the method, based on based on zero-sequence current route selection method, by on-line checkingi power distribution network correlation parameter, is followed the tracks of the change of the power distribution network method of operation, automatically determined the earthing wire-selecting mode being applicable to power distribution network.When electrical network zero-sequence current meets zero sequence current mutual inductor sensitivity requirement, directly with the route selection of zero-sequence current route selection method; When electrical network zero-sequence current can not meet the mutual device sensitivity requirement of zero-sequence current, compensated by zero sequence current compensation branch road, make it meet zero sequence current mutual inductor sensitivity requirement.Namely this earthing wire-selecting method is applicable to the electrical network of power network neutral point insulation against ground, is applicable to again the electrical network of neutral point through arc suppression coil compensation.Simply, easy, safe, reliable, the faulty line of single-phase earthing can be detected exactly.
Description
Technical field
The present invention relates to Single-phase Earth-fault Selection in Distribution Systems field, is power distribution network adaptive earthing selection method and device.
Background technology
During power distribution network generation single-phase earthing, regulations stipulate can failure operation with ground 2 hours.When this is less based on power distribution network ground current, most of instantaneity ground arc can self-extinguish, moreover, during due to power distribution network generation single-phase earthing, three-phase electricity route voltage is constant, little on normal power supply impact, in two hours, most of ground arc can self-extinguish, and this is very favorable to raising mains supply reliability.But, if ground current is comparatively large, the sustained combustion of single-phase earthing electric arc, will arc grounding over-voltage be there is, or due to the thermal ionization of electric arc and photoionization, the insulation of ring surrounding air can be broken, develop into phase fault accident, even develop into " baked wheaten cake is operated " accident.If there is single-phase wire break fault in addition, mains side conductor cord disconnection lands and can constitute a threat to personal safety.The domestic distribution line mains side conductor cord disconnection that once repeatedly occurred lands and causes human casualty accident.So, when distribution net work earthing fault occurs, the inspection of line of ground connection occurring out, and must be excised within the regular hour within a certain period of time.Then trouble spot is found, row relax of going forward side by side.
The simplest earthing wire-selecting method is zero-sequence current route selection method, and namely install zero sequence current mutual inductor at each feeder line, when singlephase earth fault occurs, the zero-sequence current detecting each feeder line selects faulty line.This method is simple, easy, when zero-sequence current meets zero sequence current mutual inductor sensitivity requirement, can accurately select faulty line.But as less in power distribution network scale, zero-sequence current is also less during single-phase earthing, can not meet the requirement of zero sequence current mutual inductor sensitivity, zero-sequence current route selection method cannot be used.Some medium scale electrical networks, under the large method of operation, during single-phase earthing, zero-sequence current meets the requirement of zero sequence current mutual inductor sensitivity, but the requirement of zero sequence current mutual inductor sensitivity can not be met when the little method of operation, be in operation due to the change of the method for operation like this, zero sequence current mutual inductor sensitivity can be met when will have, sometimes can not meet again the phenomenon of zero sequence current mutual inductor sensitivity.
The electrical network that neutral point compensates through automatic tracking and compensating arc distinction device, can work under over-compensation, under-compensation and full compensation three state.When singlephase earth fault occurs, after Automatic-track arc eliminating device compensates, fault residual current may be very little, can not meet the requirement of the sensitivity of current transformer, cannot apply zero sequence drying method and carry out earthing wire-selecting.Although have harmonic current method route selection method, transient current method route selection method, note ripple route selection method and remnant current increment route selection method at present, but all can not solve the accurate route selection problem of compensation network, and the application of often kind of method all has limitation, the accurate earthing wire-selecting of the electrical network of particularly neutral point automatic tracking and compensating arc distinction device compensation has become puzzlement electric system technical barrier for many years.
Summary of the invention
For the shortcoming of above-mentioned prior art, invent based on based on zero-sequence current route selection method, automatically to detect the power distribution network adaptive earthing selection method and device that power distribution network correlation parameter is foundation.By automatic tracing detection power distribution network correlation parameter, calculate the single-phase earth fault current of power distribution network under each method of operation.When electrical network zero-sequence current meets zero sequence current mutual inductor sensitivity requirement, directly with the route selection of zero-sequence current route selection method; When electrical network zero-sequence current can not meet zero sequence current mutual inductor sensitivity requirement, compensated by zero sequence current compensation method, make it meet zero sequence current mutual inductor sensitivity requirement.This earthing wire-selecting method is applicable to neutral grounding in distribution power network and the method for operation automatically, realizes accurate route selection.
The invention provides a kind of power distribution network power distribution network adaptive earthing selection method and device.Apply the grounding transformer extraction power network neutral point that low capacity complications connect; Transformer neutral point over the ground between be parallel with Power network parameter measureing branch road; Zero sequence current compensation branch road; At electrical network each feeder line dress zero sequence current mutual inductor; Package unit carries out observing and controlling by computer measurement and control unit.
The displacement voltage u of Power network parameter measureing branch road on-line measurement power network neutral point
on, after short circuit neutral ground switch QF1, neutral ground short-circuit current I can be measured
0d.According to open-circuit voltage and short-circuit current value can the capacitance current of distribution network of computing system be:
.
To be neutral point of electric network in parallel one compensate branch road by switch to zero sequence current compensation branch road over the ground, and the zero-sequence current of compensation is I
b, after zero sequence current compensation branch road compensates, make its ground current flowing through fault loop be greater than the detection sensitivity I of zero sequence current mutual inductor
μ, to meet the sensitivity requirement of zero-sequence current route selection method zero sequence current mutual inductor.
The power distribution network of centering point insulation against ground, when device access electrical network, or during power system operating mode change, by Power network parameter measureing branch road real-time detection of grid neutral point displacement voltage U
n, work as U
nvariation delta U
nwhen being greater than tracking sensitivity δ, start Power network parameter measureing calculation procedure, the capacitance current I of survey calculation electrical network
c.Relatively capacitance current I
cwith zero sequence current mutual inductor sensitivity I
μrelation, if I
c>=I
μ, then zero sequence drying method route selection is directly used; If I
c≤ I
μ, then enable the route selection of zero sequence current compensation method, make the ground current flowing through fault loop meet the sensitive requirement of zero sequence current mutual inductor.
Centering point is through the electrical network of grounding through arc, because modern automatic tracking and compensating arc distinction device can be operated in over-compensation, run under under-compensation and full compensating coefficient, fault residual flow after automatic tracking and compensating arc distinction device compensates may be very little, the requirement of zero sequence current mutual inductor sensitivity cannot be met, directly should adopt the route selection of zero sequence current compensation method.When neutral displacement voltage u being detected
n>=u
jtime (u
jfor earth fault critical value), judge that electrical network there occurs singlephase earth fault, at this moment QF2 switch is closed immediately, drop into zero sequence current compensation branch road, zero-sequence current is compensated, make to meet zero sequence current mutual inductor sensitivity requirement by the zero-sequence current of fault loop, adopt zero-sequence current route selection method to find out faulty line fast.
The present invention has following advantage:
1, the power distribution network of centering point insulation against ground, by the change of the Power network parameter measureing branch road on-line tracing detection of grid method of operation, automatically can adjust route selection pattern to adapt to power system operating mode change, have stronger adaptability.
2, centering point is through the electrical network of grounding through arc, after using zero sequence current compensation method to compensate, make to meet zero sequence current mutual inductor sensitivity by the zero-sequence current of fault loop, adopt zero-sequence current route selection method to find out faulty line fast, solve through grounding through arc ground this puzzlement electric system of route selection difficult problem for many years.
3, the method is based on zero-sequence current, simple, easy, convenient, has higher cost performance.
Accompanying drawing explanation
Fig. 1 is principle of device wiring diagram, and the grounding transformer that in figure, (1) connects for Z-type, in order to extraction system neutral point; (2) be Power network parameter measureing branch road, be made up of voltage measurement module and grounding switch series current measuring unit, in order to measure short-circuit current during neutral point displacement voltage and the neutral ground short circuit of electrical network; (3) be zero sequence current compensation branch road, being used for the zero-sequence current in compensate for failed loop makes it meet the requirement of zero sequence current mutual inductor sensitivity; (4) be computer measurement and control unit, be used for measuring, calculate and controlling.
Embodiment
Centering point insulation against ground electrical network, when device access electrical network, or power system operating mode change causes neutral point displacement voltage U
nchange, works as U
nvariation delta U
nwhen being greater than tracking sensitivity δ, start Power network parameter measureing calculation procedure, the capacitance current I of survey calculation now electrical network
c.Relatively capacitance current I
cwith zero sequence current mutual inductor sensitivity I
μrelation, if I
c>=I
μ, then zero sequence drying method route selection is directly used; If I
c≤ I
μ, then enable the route selection of zero sequence current compensation method, make the ground current flowing through fault loop meet the sensitive requirement of zero sequence current mutual inductor.When neutral displacement voltage u being detected
n>=u
jtime (u
jfor earth fault critical value), judge that electrical network there occurs singlephase earth fault, at this moment start immediately and carry out route selection with selected line selection mode.
Centering point, through the electrical network of grounding through arc, directly adopts the route selection of zero sequence current compensation method.When neutral displacement voltage u being detected
n>=u
jtime (u
jfor earth fault critical value), judge that electrical network there occurs singlephase earth fault, at this moment QF2 switch is closed immediately, drop into zero sequence current compensation branch road, zero-sequence current is compensated, make the requirement being met zero sequence current mutual inductor sensitivity by the zero-sequence current of fault loop, adopt zero-sequence current route selection method to find out faulty line fast.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention also should be considered as protection scope of the present invention.
Claims (1)
1. power distribution network adaptive earthing selection method, the grounding transformer (1) connected by Z-type, Power network parameter measureing branch road (2), zero sequence current compensation branch road (3), computer measurement and control unit (4) and the zero sequence current mutual inductor composition be arranged on each feeder line of electrical network, it is characterized in that: centering point insulation against ground power distribution network, by Power network parameter measureing branch road (2), tracking measurement is carried out to the neutral point displacement voltage of power distribution network and power system operating mode, calculate electric network capacitance and current, the relatively relation of capacitance current Ic and zero sequence current mutual inductor sensitivity electric current I μ, dynamically appraise and decide the earthing wire-selecting method being applicable to the power distribution network method of operation, judging whether to meet zero sequence current mutual inductor sensitivity requirement, during as met the requirement of zero sequence current mutual inductor sensitivity, then directly adopting zero-sequence current route selection method, during if do not met the requirement of zero sequence current mutual inductor sensitivity, drop into zero sequence current compensation branch road, the zero-sequence current of equalizing network, after making it meet zero sequence current mutual inductor sensitivity requirement, then uses the route selection of zero-sequence current route selection method.
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| CN201410094705.4A CN103823160B (en) | 2014-03-15 | 2014-03-15 | Power distribution network adaptive earthing selection method and device |
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| CN201410094705.4A CN103823160B (en) | 2014-03-15 | 2014-03-15 | Power distribution network adaptive earthing selection method and device |
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| CN103823160B true CN103823160B (en) | 2016-04-13 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105159378B (en) * | 2015-08-06 | 2016-09-21 | 保定上为电气科技有限公司 | A kind of earthing wire-selecting auxiliary signal control system and control method thereof |
| CN106505537B (en) * | 2016-12-08 | 2019-08-06 | 李景禄 | A kind of power network neutral point dynamic electric resistor earthing wire-selecting method |
| CN107300656B (en) * | 2017-06-17 | 2019-11-05 | 李景禄 | A kind of ground fault starting method based on power grid characteristic parameter incremental |
| CN109270408A (en) * | 2018-11-21 | 2019-01-25 | 宁波恒晨电力建设有限公司 | One-phase earthing failure in electric distribution network method for dynamically processing and system |
| CN110389276A (en) * | 2019-08-06 | 2019-10-29 | 安徽凯川电力保护设备有限公司 | A kind of singlephase earth fault management system and method |
| CN112666421A (en) * | 2019-10-16 | 2021-04-16 | 李景禄 | Fault area isolation method based on compensation damping type active intervention arc suppression device |
| CN114217172A (en) * | 2021-12-16 | 2022-03-22 | 国网湖北省电力有限公司孝感供电公司 | Power distribution network single-phase earth fault area judgment method based on node identification |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2202369Y (en) * | 1994-05-03 | 1995-06-28 | 中国矿业大学 | Automatic tracking compensation arc suppression coil |
| RU2455743C1 (en) * | 2010-12-22 | 2012-07-10 | Общество с ограниченной ответственностью Внедренческое предприятие "Наука, техника, бизнес в энергетике" | Method for increasing active current of single phase-to-ground fault in resonant grounded systems with neutral grounded via arc-suppression coil and device for such method implementation |
| CN103208788B (en) * | 2013-03-08 | 2015-11-04 | 李景禄 | Intelligent Dynamic power network neutral point earthing method and the complete sets of equipment |
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Effective date of registration: 20200512 Address after: 410011 No. 9, No. 188, No. four, 204 Middle East environmental protection road, Yuhua District, Hunan, Changsha Patentee after: CHANGSHA XINCHANG ELECTRIC POWER SCIENCE & TECHNOLOGY Co.,Ltd. Address before: 302, room 22, 410076 west side, Changsha University of Science and Technology, 45 Ling Ling Road, Tianxin, Hunan, Changsha Patentee before: Li Jinglu |