CN103592536A - Laboratory simulation test method of control parameters of dynamical earthing method for power distribution network neutral point - Google Patents
Laboratory simulation test method of control parameters of dynamical earthing method for power distribution network neutral point Download PDFInfo
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Abstract
According to a laboratory simulation test method of control parameters of a dynamical earthing method for a power distribution network neutral point, a power distribution simulation test network (1), automatic tracking arc extinction and compensation complete equipment (2) and an earth fault point (3) are included. By means of the laboratory simulation test method, under the situation of different voltage grades, different power grid insulation structures and different residual flow control modes of arc extinction coil connection, an extinction arc critical value of an instantaneous earth fault of a power distribution network under the different fault point insulation working conditions, and displacement voltage and the corresponding extinction arc time of the power distribution network neutral point when the earth fault recovers are obtained, and therefore the control parameters of the dynamical earthing method for the power distribution network neutral point and the complete equipment are obtained.
Description
Technical field
The present invention is mainly power network neutral point ground connection field, refers in particular to the laboratory simulation test method that the dynamic earthing method of a kind of power network neutral point is controlled parameter.
Background technology
Neutral by arc extinction coil grounding is mainly used in capacitance current and is greater than the power distribution network in 10A, and for guaranteeing continuity and the reliability of power supply, rules regulation can be with singlephase earth fault operation 2 hours.This is that fault residual current based on after arc suppression coil compensation is less than electrical network blow-out critical value, can impel arc extinction, makes fault recovery that power supply reliability is improved.But grounding through arc can not allow the insulation of trouble spot be restored, and when having people to contact, personal safety accident can occur.Power network neutral point low resistance grounding mode, for the power distribution network with zero-sequenceprotection, when singlephase earth fault occurs, is excised faulty line by zero-sequenceprotection.Once will trip but the defect of this earthing mode maximum is exactly power distribution network generation single-phase earthing, particularly in multi-thunder area, can cause tripping rate with lightning strike high, distribution network reliability is significantly declined, also wearing and tearing simultaneously that strengthened distribution switchgear, the serviceable life of having reduced switchgear.
The dynamic earthing method of power network neutral point and complete equipment have merged the advantage of grounding through arc mode and low resistance grounding, avoided the shortcoming of these two kinds of earthing modes, when electrical network generation instantaneity earth fault, can eliminate instantaneity earth fault by grounding through arc mode, improve power supply reliability, during as electrical network generation permanent earth fault, can dynamically switch to low resistance grounding mode and excise faulty line and guarantee equipment and personal safety.But need to solve that residual flow after compensation is controlled and the matter of time of corresponding dynamic switching.As excessive in residual flow, can affect reliably extinguishing of ground arc, as too small in residual flow, can cause that electrical network is de-humorously spends littlely, can make electrical network asymmetrical voltage too high.The dynamic earthing method of power network neutral point and complete equipment melt dynamic handoff parameter and the switching time that should adopt science, what switch is too early, do not guarantee power supply reliability, what switch is excessively late, ground short circuit fault is held for continuing the time long, can bringing out phase fault or cause personal safety accident, thereby selecting correct dynamic handoff parameter and switching time, is very important.
Summary of the invention
The present invention refers in particular to the laboratory simulation test method that the dynamic earthing method of a kind of power network neutral point is controlled parameter.As shown in the figure: utilize lumped parameter to replace distribution parameter at the simulation test power distribution network building in laboratory, adopt the equipment such as pressure regulator, step-up transformer, switch, capacitor and mutual inductor to form the analog ligand electrical network of different electric pressures.By change, be arranged on the single-line to ground fault electric current that the online ground capacitance of simulation test is adjusted simulation test net.By the voltage with step-up transformer adjustment simulation test power distribution network.In simulation test Netcom, cross switch and control the special earth fault arranging, the insulation operating mode of earth fault while carrying out the different running status of analog ligand electrical network by changing the insulator of earth fault.Current transformer is installed between over the ground in earth fault and is measured ground current value.In simulation test net access, from motion tracking arc extinction compensation complete equipment, control or the dynamic earthing method of power network neutral point and complete equipment are adjusted the ground current value of earth fault.By switch, single-phase earthing point is dropped into ground short circuit and test, at insulator, be close to fuse in parallel, the mode by the starting the arc of fuse circuit fusing produces single-line to ground fault electric arc.At the trial by adjusting residue current of ground fault in electrical, with under earth point insulation operating mode, obtain single-phase earthing blow-out critical value, power network neutral point displacement voltage when earth fault is recovered and corresponding blow-out time thereof, thus draw the control parameter in the dynamic earthing method of power network neutral point and complete equipment.
The present invention has following advantage:
1, equivalence is good, because be to utilize the lumped parameter that controller switching equipment builds to replace distribution parameter at the simulation test net building in laboratory, its network formation, rated voltage are consistent with actual power distribution network height, thereby equivalence is strong.The test findings that the simulation test building in laboratory draws is on the net applicable to real power distribution network completely.
2, workable, the simulation test net building in laboratory can be changed as required electric network element parameter and test, and compares more convenient with site test.Can change voltage and single-phase-to-ground current value and the insulation against ground operating mode etc. of adjusting power distribution network by changing the method for device parameter, there is extraordinary dirigibility and operability.
Accompanying drawing explanation
Fig. 1 is laboratory simulation test wiring diagram, in figure, (1) utilizes lumped parameter to replace distribution parameter to carry out analog ligand electrical network at the simulation test net building in laboratory, adopt pressure regulator, step-up transformer, switch, capacitor, insulator and mutual inductor etc. to form the analog ligand electrical network of different electric pressures, this simulation test net can be adjusted into by pressure regulator and step-up transformer the power distribution network of different electric pressures; (2) be from motion tracking arc extinction compensation complete equipment or the dynamic earthing method of power network neutral point and complete equipment; (3) be distribution net work earthing fault set-point, by switch, dropping into single-phase earthing point, test, at insulator, be close to fuse in parallel, by fuse circuit fusing, produce single-line to ground fault electric arc, insulator can be selected according to the conventional model of power distribution network, and surface can be processed according to the actual condition of power distribution network.
Embodiment
Blow-out critical value under power distribution network different insulative operating mode test, as shown in the figure, the insulation status of earth fault is selected to the insulator model that power distribution network is conventional, by controlling from motion tracking arc extinction compensation complete equipment or the dynamic earthing method of power network neutral point and complete equipment are adjusted the earth short circuit current value of earth fault, at insulator, be close to fuse in parallel over the ground, the mode by fuse circuit fusing produces single-line to ground fault electric arc.First from lower single-phase-to-ground current value, do, progressively strengthen single-phase-to-ground current value, until single-line to ground fault electric arc can not blow-out only, the blow-out critical value while drawing each volume electric pressure application different insulative operating mode.Be mainly the method for the chamber simulation test by experiment blow-out critical value while drawing power distribution network different insulative structure, for the residual flow of complete equipment, control foundation is provided.
Blow-out time test during the different residual flow parameter of power distribution network, to specific power distribution network insulation operating mode, by controlling from motion tracking arc extinction compensation complete equipment or the dynamic earthing method of power network neutral point and complete equipment are adjusted the earth short circuit current value of earth fault, the blow-out time that draws the different corresponding transient faults of earth short circuit current value, the insulation operating mode that then changes earth fault is tested again.Chamber simulation test draws residual flow controlling value and the relation of transient fault blow-out time under conventional power distribution network insulation operating mode by experiment, for foundation is provided dynamic switching time of complete equipment.
The asymmetrical voltage of simulation test net is tested, first adjusted to fault recovery neutral point displacement voltage criterion under power distribution network different insulative operating mode, makes it be less than 15%U
Ф, by adjust the earth short circuit current value of earth fault from motion tracking arc extinction compensation complete equipment or the dynamic earthing method of power network neutral point and complete equipment, carry out blow-out test.Neutral point of electric network displacement voltage while recording arc extinction.Then the insulation operating mode that changes earth fault is tested again, and the neutral point displacement voltage of maximum while drawing distribution network failure blow-out under customary insulation operating mode, as the dynamic earthing method of power network neutral point and complete equipment instantaneity earth fault blow-out criterion.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging 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, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. the dynamic earthing method of a power network neutral point is controlled the laboratory simulation test method of parameter, comprise distribution simulation test net (1), from motion tracking arc extinction compensation complete equipment (2), earth fault (3), form, it is characterized in that: the true value test electrical network that distribution simulation test net (2) forms for replaced distribution parameter by lumped parameter; Earth fault (3) is connected in parallel on insulator with fuse is close to, and controls ground short circuit produce ground short circuit electric arc by switch; From motion tracking arc extinction compensation complete equipment (2), adjust distribution net work earthing fault residual flow, method by simulation test obtains single-phase earthing blow-out critical value under different ground short circuits trouble spot insulation operating mode, power network neutral point displacement voltage when earth fault is recovered and corresponding blow-out time thereof, thus draw the control parameter in the dynamic earthing method of power network neutral point and complete equipment.
2. the dynamic earthing method of a kind of power network neutral point according to claim 1 is controlled the laboratory simulation test method of parameter, it is characterized in that: distribution net work earthing fault point (3) is adopted to different insulative and different insulator surface operating modes, by fuse, cause ground connection to produce ground short circuit electric arc, the power network neutral point displacement voltage while showing that by simulation test blow-out critical value, ground arc under power distribution network different insulative operating mode extinguishes.
3. the dynamic earthing method of a kind of power network neutral point according to claim 1 is controlled the laboratory simulation test method of parameter, it is characterized in that: by changing the ground current of adjusting earth fault (3) from the mode of motion tracking arc extinction compensation complete equipment (2) offset current output, duration to ground short circuit electric arc measures, ground current and the corresponding relation of blow-out time while drawing specific different ground short circuit point insulating operating mode by the method for simulation test, thus show that residual flow in complete equipment controls the relation with the dynamic translation time.
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| CN104914391A (en) * | 2015-05-05 | 2015-09-16 | 国家电网公司 | Distribution network single-phase grounding fault simulation and positioning performance test platform and method |
| CN105743075A (en) * | 2016-04-22 | 2016-07-06 | 国家电网公司 | Single-phase arc-grounding simulation device for power distribution network |
| CN109799413A (en) * | 2017-11-16 | 2019-05-24 | 李景禄 | A kind of single phase grounding current of electric power network and electric arc self arc time simulation test method |
| CN110426601A (en) * | 2019-08-22 | 2019-11-08 | 金华电力设计院有限公司 | A kind of Fault Locating Method of earth-free photovoltaic system |
| CN111262232A (en) * | 2020-03-05 | 2020-06-09 | 南京方自科技有限公司 | Distribution network grounding state safety identification and working condition control method |
| CN111384847A (en) * | 2020-04-22 | 2020-07-07 | 京东方科技集团股份有限公司 | Power-on protection circuit of direct-current power supply, method for driving load circuit and electronic equipment |
| CN111856211A (en) * | 2020-07-31 | 2020-10-30 | 国网河南省电力公司漯河供电公司 | Line fault arc quenching critical value test method based on asymmetric power distribution network |
| CN112285492A (en) * | 2020-12-31 | 2021-01-29 | 中国电力科学研究院有限公司 | Power distribution network ground fault test system and method |
| CN114156855A (en) * | 2021-12-08 | 2022-03-08 | 国网辽宁省电力有限公司朝阳供电公司 | Dynamic full-compensation arc suppression coil for power distribution network grounding residual current and input and exit method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104914391A (en) * | 2015-05-05 | 2015-09-16 | 国家电网公司 | Distribution network single-phase grounding fault simulation and positioning performance test platform and method |
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| CN105743075A (en) * | 2016-04-22 | 2016-07-06 | 国家电网公司 | Single-phase arc-grounding simulation device for power distribution network |
| CN109799413A (en) * | 2017-11-16 | 2019-05-24 | 李景禄 | A kind of single phase grounding current of electric power network and electric arc self arc time simulation test method |
| CN110426601A (en) * | 2019-08-22 | 2019-11-08 | 金华电力设计院有限公司 | A kind of Fault Locating Method of earth-free photovoltaic system |
| CN111262232A (en) * | 2020-03-05 | 2020-06-09 | 南京方自科技有限公司 | Distribution network grounding state safety identification and working condition control method |
| CN111384847A (en) * | 2020-04-22 | 2020-07-07 | 京东方科技集团股份有限公司 | Power-on protection circuit of direct-current power supply, method for driving load circuit and electronic equipment |
| CN111856211A (en) * | 2020-07-31 | 2020-10-30 | 国网河南省电力公司漯河供电公司 | Line fault arc quenching critical value test method based on asymmetric power distribution network |
| CN112285492A (en) * | 2020-12-31 | 2021-01-29 | 中国电力科学研究院有限公司 | Power distribution network ground fault test system and method |
| CN112285492B (en) * | 2020-12-31 | 2021-04-13 | 中国电力科学研究院有限公司 | Power distribution network ground fault test system and method |
| CN114156855A (en) * | 2021-12-08 | 2022-03-08 | 国网辽宁省电力有限公司朝阳供电公司 | Dynamic full-compensation arc suppression coil for power distribution network grounding residual current and input and exit method thereof |
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