CN104953529B - A kind of online de-icing method of distribution line based on single-phase earth fault current - Google Patents
A kind of online de-icing method of distribution line based on single-phase earth fault current Download PDFInfo
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- CN104953529B CN104953529B CN201510097305.3A CN201510097305A CN104953529B CN 104953529 B CN104953529 B CN 104953529B CN 201510097305 A CN201510097305 A CN 201510097305A CN 104953529 B CN104953529 B CN 104953529B
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- 230000001629 suppression Effects 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000000155 melt Substances 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
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- 239000000463 material Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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Abstract
A kind of online de-icing method of distribution line based on single-phase earth fault current, is related to a kind of online de-icing method.Current ultra-high-tension power transmission line, lacks economic and practical ice-melt de-icing method.Step of the present invention is：On-line measurement distribution line load current；Earth-fault current when singlephase earth fault occurs for distribution line end is calculated according to the critical ice melting current of circuit and load current；The inductance setting value during arc suppression coil of power distribution network undercompensation operation for meeting distribution line ice-melt requirement is calculated, and adjusts arc suppression coil inductance more than or equal to the inductance setting value；Artificial singlephase earth fault is carried out in distribution line end, distribution line ice-melt is realized；After the completion of ice-melt, earth fault is released, and adjust runtime value before arc suppression coil inductance to ice-melt.The technical program de-icing method without distribution line have a power failure run, without installing special deicing device, with it is simple to operate, practical, ice-melt is efficient the characteristics of.
Description
Technical field
The invention belongs to system for distribution network of power de-icing technology field, more particularly to a kind of online de-icing method.
Background technology
China's middle and south number, which is saved easily, there is a wide range of frost sleety weather, causes distribution line icing, occurs insulator and fall
The accidents such as string, the broken string of falling tower, or even cause large-area power-cuts.Therefore, suitable deicing, anti-icing technology are studied, for ensureing electricity
The stability operation important in inhibiting of net.
Up to the present, deicing de-icing technology both domestic and external has kind more than 30, and three can be summarized as according to the difference of operation principle
Class：Mechanical ice-melting method, natural ice-melting method and heating power deicing method.
1) mechanical ice-melting method.Mechanical ice-melt mainly by mechanics effect, destroys the mechanical balance of icing on wire, then
It is set come off.At present frequently with electromagnetic pulse, slide that shovel is scraped and the method such as artificial carrys out deicing.Electromagnetic pulse deicing is to utilize wire
In eddy current effect, the pulsed magnetic field produced by capacitor and inductance coil produces vortex and magnetic field, with coil on wire
Magnetic field produces repulsion, wire is expanded under the repulsion in two magnetic field, with the change of pulse, the repulsion that wire is subject to also occurs
Change, constantly expansion and contraction make the coating ice falling of conductive line surfaces to wire.Sliding one-lick is pulled by ground handling operator
Pulley on circuit, pulley walks to root out the icing on wire on the line.Another is artificial deicing, by except match-maker
Member scene carries out anti-ice operation to wire, extremely inefficient, it is necessary to expend substantial amounts of man power and material, and there is certain safety wind
Danger.
2) natural deicing method.Natural deicing method extraneous need not add energy, but make full use of natural conditions to circuit
Carry out deicing.The coating with hydrophobicity performance for example is applied in wire or insulator surface, can be by reducing water and ice and wire
Adhesive force come prevent freeze；It can promote icing by natural conditions when wire icing reaches to a certain degree using anti-snow ring
Ice sheet on circuit comes off；Counterweight is installed on wire, can prevent that wire from reversing, prevents to form snow ring after wire accumulated snow.
3) heating power deicing method.Existing various heating power de-icing methods are all to use joule heating effect deicing principle, in icing
The transmission electric current more than or equal to critical ice melting current is passed on wire, makes conductor overheating and then causes its surface overlying ice-out
Or come off.Heating power deicing method more common at present has：Short circuit current method, high frequency pumping ice-melt, DC current method and load ice-melt
Method.But these methods all have the problem of many limitations and difficult practical operation.For example：Short-circuit ice-melting method is necessary
Make icing line outage, the reliability of user power utilization, and complex operation can be badly influenced；DC ice melting method needs to study special
The DC de-icing device of door, investment cost is huge；Although load ice-melt can be in the case of circuit of not stopping transport, by changing line
The electric current flowed through on power load distributing on road, increase icing circuit, reaches the purpose of ice-melt, but by part throttle characteristics and operation of power networks
The limitation of mode, restricted application.
In addition, the ice-melt de-icing method of currently the majority, primarily directed to ultra-high-tension power transmission line, and mesolow distribution line
Wide area is distributed, the class of insulation is low, is configured without deicing device, lacks economic and practical ice-melt de-icing method.
The content of the invention
To solve the problem of above-mentioned ultra-high-tension power transmission line de-icing method is difficult to be applied to mesolow distribution line, the present invention is carried
A kind of online de-icing method of the distribution line based on single-phase earth fault current is supplied.
The technical scheme that the present invention solves above-mentioned technical problem comprises the following steps：
1) on-line measurement distribution line load current；
2) according to the critical ice melting current of distribution line and load current, during calculating distribution line progress singlephase earth fault
Earth-fault current；
3) the arc suppression coil inductance setting value for distribution line ice melting operation is calculated, and adjusts arc suppression coil inductance and is more than
Or equal to the inductance setting value；
4) artificial singlephase earth fault is carried out in distribution line end, realizes distribution line ice-melt；
5) after the completion of ice-melt, earth fault is released, and adjust runtime value before arc suppression coil inductance to ice-melt.
Load electricity when the technical program is normally run by the critical ice melting current and on-line measurement circuit of icing circuit
Stream, calculates the earth-fault current value when singlephase earth fault occurs for line end and the inductance setting value of arc suppression coil, so
The inductance for the arc suppression coil for being connected to power network neutral point is adjusted afterwards to setting value, then manually single-phase is carried out to the line end connects
The electric current flowed through in earth fault, increase circuit, is larger than or equal to the critical ice melting current value of circuit, so as to reach that ice-melt is protected
The purpose of line.The principle of the invention is simple, icing line outage need not be handled, need not install special deicing device, ice-melt speed
Fast, efficiency high is spent, is easy to Project Realization and is not influenceed by the method for operation of circuit, one kind can be provided for distribution line ice-melt
The de-icing method of convenient and efficient.
As further improving and supplementing to above-mentioned technical proposal, present invention additionally comprises following additional technical feature.
Step 2) in the computing formula of distribution circuit single-phase earth fault electric current be：
Wherein, ImFor the critical ice melting current of circuit, IhFor line load electric current, θ is the power factor angle of line load.
Step 3) in the computing formula of arc suppression coil inductance setting value of distribution line ice melting operation be：
L=Uph/(3ω2CUph-ωIf)
Wherein, UphPower supply phase voltage, ω is power network power frequency angular frequency, and C is the single-phase distributed capacitance over the ground of power distribution network.
The technical effects of the invention are that：(1) occurring list using distribution line neutral by arc extinction coil grounding system
After phase earth fault, can still operate with failure a period of time the characteristics of, without to icing line outage, improving what power network was powered
Reliability；(2) de-icing method of invention only needs regulation arc suppression coil inductance value to be more than or equal to setting value, then in distribution wire
Road end carries out artificial singlephase earth fault, without increasing deicing device and carrying out complicated grid switching operation, realizes easy.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Fig. 2 is the online ice-melt principle schematic of the present invention.
Each phase voltage and phase current vector correlation figure when Fig. 3 is up.
Fig. 4 is each phase voltage of singlephase earth fault and phase current vector correlation figure.
Fig. 5 is the simulated line single-phase earthing schematic diagram of the present invention.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
China's power network neutral point typically uses grounding through arc, when singlephase earth fault occurs for power distribution network, line electricity
Pressure keep it is constant, only three phase-to-ground voltages change, and can not interrupt to customer power supply, and allow band singlephase earth fault after
Reforwarding row for a period of time, is provided according to the related operating standard of power system：The band most long sustainable operation 2 of singlephase earth fault is small
When.And thermal ice-melting scheme was typically formulated by 60 minutes ice-melt time at present, determined according to conductor cross-section, weather conditions and ice thickness
Critical ice melting current is exchanged, i.e., under the conditions of line current is more than critical ice melting current, the ice-melt time is less than 60 minutes.Therefore,
Single-phase earth fault current ice-melt disclosure satisfy that the requirement of the online ice-melt of distribution line.
The present invention is by taking the ice-melt of certain 35kV electric distribution network overhead wire as an example, feeder line parameter and the line load parameter such as institute of table 1
Show, according to conductor cross-section, weather conditions (temperature is -3 DEG C, wind speed 3m/s) and ice thickness 10mm, determine that the exchange of circuit 1,2,3 is faced
Boundary's ice melting current is respectively 169A, 214A and 270A.Referring to Fig. 1 and Fig. 2, Fig. 1 is the distribution based on single-phase earth fault current
The online ice-melt flow chart of circuit；Fig. 2 is implements the online ice-melt schematic diagram of overhead transmission line of the present invention, by taking A phase line ice-melts as an example,
A phase earth faults are carried out, the load current of A phase lines and the vector of earth-fault current is more than critical ice melting current, it is real
Existing A phase line ice-melts, it is ensured that the ice-melt time is less than 60 minutes.
Under normal running (operation) conditions, the vector analysis of each phase voltage of circuit and phase current is as shown in Figure 3；Earth fault ice-melt bar
Under part, critical ice melting current, load current, earth-fault current vector correlation it is as shown in Figure 4.Distribution line A phases are grounded event
Hinder ice-melt, artificial Single-phase Ground Connection Failure is arranged on DC ice-melting A phases end, now short dot constitutes loop with the earth, connects
Earth fault electric current IfBy greatly flowing to circuit, because power network neutral point arc suppression coil is set to serious undercompensation, then event is grounded
Barrier current phase lags behind residual voltage (U0) 90 °, that is, it is ahead of earth fault phase supply voltage UphA90 ° of (A phases).
To meet ice-melt requirement, circuit minimum ice melting current is more than or equal to the critical ice melting current I of circuitm, ice melting current
Bigger, the ice-melt time is shorter.Ice melting current includes A phase load electric currents IhAWith earth-fault current If, as shown in Figure 4, work as circuit
In flow through electric current equal to critical ice melting current when：
Im 2=(If-IhA sinθ)2+(IhA cosθ)2
The computing formula of earth-fault current is：
Wherein, θ is the power factor angle of line load.
Using A phase metallicity singlephase earth fault ice-melts, residual voltageSo voltage effective value U0=UphA
=Uph, the operation of arc suppression coil undercompensation, the electric current flowed through is：
Then the setting value of arc suppression coil inductance is：
L=Uph/(3ω2CUph-ωIf)
Wherein, UphPower supply phase voltage, UphAFor power supply A phase phase voltages, ω is power network power frequency angular frequency, and C is that power distribution network is single-phase
Distributed capacitance over the ground.
When adjusting arc suppression coil inductance equal to the inductance setting value, then the actual ice melting current of circuit is equal to critical ice-melt electricity
Stream；When adjusting arc suppression coil inductance more than the inductance setting value, arc suppression coil inductance is bigger, and power distribution network undercompensation is more, then
Earth-fault current is bigger, and ice melting current (i.e. the vector of the load current of A phase lines and earth-fault current) is also bigger, then
The ice-melt time is shorter.
The A phase earth fault ice-melts of analysis circuit 1.Load current I when circuit 1 is normally run can be obtained by table 1h1For
91.61A, much smaller than critical ice melting current Im1=169A, load current can not directly ice-melt.The load power factor cos of circuit 1
θ=0.998, then sin θ=0.063, the single-phase direct-to-ground capacitance of power distribution network includes the single-phase direct-to-ground capacitance sum C=0.05+ of all circuits
0.1+0.15+10=10.3H, occurs earth-fault current during A phase single-phase earthings, then calculate arc blowout wire
The inductance setting value of circle.Will
Arc suppression coil inductance is adjusted to LReal 1=1.5H, more than setting value, artificial singlephase earth fault is set in DC ice-melting A phases end
Point, calculates and obtains the actual earth-fault current of circuit 1 and be：
The actual ice melting current that then A phase lines flow through is：
Then actual ice melting current is more than critical ice melting current Im1=169A, can effectively realize line ice-melting, and during ice-melt
Between be less than 60 minutes.
The A phase earth fault ice-melts of analysis circuit 2.Load current I when circuit 2 is normally run can be obtained by table 1h2For
130A, much smaller than critical ice melting current Im2=214A, load current can not directly ice-melt.The load power factor cos θ of circuit 2
=0.998, then sin θ=0.063, occurs earth-fault current during A phase single-phase earthingsThe electricity of arc suppression coil is calculated again
Feel setting value
Arc suppression coil inductance is adjusted to LReal 2=4.0H, more than setting value, artificial single-phase earthing event is set in DC ice-melting A phases end
Hinder point, the actual earth-fault current that calculating obtains circuit 2 is：
The actual ice melting current that then A phase lines flow through is：
Then actual ice melting current is more than critical ice melting current Im2=214A, can effectively realize line ice-melting, and during ice-melt
Between be less than 60 minutes.
The A phase earth fault ice-melts of analysis circuit 3.Load current I when circuit 3 is normally run can be obtained by table 1h3For
214.44A, much smaller than critical ice melting current Im3=270A, load current can not directly ice-melt.The load power factor of circuit 3
Cos θ=0.998, then sin θ=0.063, occurs earth-fault current during A phase single-phase earthings, then calculate the inductance of arc suppression coil
Setting value
.Arc suppression coil inductance is adjusted to LReal 3=4.0H, more than setting value, artificial single-phase earthing event is set in DC ice-melting A phases end
Hinder point, the actual earth-fault current that calculating obtains circuit 3 is：
The actual ice melting current that then A phase lines flow through is：
Then actual ice melting current is more than critical ice melting current Im3=270A, can effectively realize line ice-melting, and during ice-melt
Between be less than 60 minutes.
Drawn by above result of calculation, the present invention is without carrying out power failure processing to icing circuit and setting special ice-melt to set
It is standby, have the advantages that method is simple, practical, efficiency high, have broad application prospects.
The feeder line parameter of table 1
The feeder line earth fault ice-melt parameter of table 2
Claims (2)
1. the online de-icing method of a kind of distribution line based on single-phase earth fault current, it is characterized in that comprising the following steps：
1) on-line measurement distribution line load current；
2) according to the critical ice melting current of distribution line and load current, ground connection when distribution line carries out singlephase earth fault is calculated
Fault current；
3) the arc suppression coil inductance setting value for distribution line ice melting operation is calculated, and adjusts arc suppression coil inductance and is more than or waits
In the inductance setting value；
4) artificial singlephase earth fault is carried out in distribution line end, realizes distribution line ice-melt；
5) after the completion of ice-melt, earth fault is released, and adjust runtime value before arc suppression coil inductance to ice-melt；
The step 2) in the computing formula of distribution circuit single-phase earth fault electric current be：
Wherein, ImFor the critical ice melting current of circuit, IhFor line load electric current, θ is the power factor angle of line load.
2. the online de-icing method of a kind of distribution line based on single-phase earth fault current according to claims 1, its
It is characterised by：The step 3) in the computing formula of arc suppression coil inductance setting value of distribution line ice melting operation be：
L=Uph/(3ω2CUph-ωIf)
Wherein, UphPower supply phase voltage, ω is power network power frequency angular frequency, and C is the single-phase distributed capacitance over the ground of power distribution network.
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| CN107359544A (en) * | 2017-08-30 | 2017-11-17 | 国网湖南省电力公司 | Exchange de-icing method for agriculture distribution line |
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| CN109119933A (en) * | 2018-09-11 | 2019-01-01 | 广东电网有限责任公司 | A kind of online de-icing method of power distribution network and device |
| CN114389223B (en) * | 2021-12-10 | 2023-10-20 | 国网浙江省电力有限公司金华供电公司 | Intelligent deicing system and method for overhead transmission line |
| CN114725874B (en) * | 2022-03-15 | 2023-04-07 | 山东大学 | Distribution line ice melting system and method based on flexible grounding device |
| CN115085130B (en) * | 2022-06-30 | 2024-01-19 | 福州大学 | Uninterrupted ice melting method for distribution line |
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| US6486569B2 (en) * | 1998-12-04 | 2002-11-26 | Hydro-Quebec | Power flow management in an electric power grid |
| CN101667722B (en) * | 2008-09-05 | 2011-07-20 | 唐翊程 | Method for melting ice and snow on power transmission and distribution lines by low voltage and high current |
| CN101604834A (en) * | 2009-05-06 | 2009-12-16 | 北京交通大学 | A kind of deicing high-voltage power transmission line method and device that uses bundle conductor |
| CN102431468B (en) * | 2011-10-25 | 2014-09-17 | 成都交大许继电气有限责任公司 | Icing preventing and ice melting method for high speed railway and system for realizing method |
| CN103364692B (en) * | 2013-07-12 | 2016-03-23 | 国家电网公司 | A kind of power distribution network single-phase grounded malfunction in grounded system selection method |
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| CN107359544A (en) * | 2017-08-30 | 2017-11-17 | 国网湖南省电力公司 | Exchange de-icing method for agriculture distribution line |
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