CN103236667B - A kind of supply line lightening arresting method - Google Patents
A kind of supply line lightening arresting method Download PDFInfo
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- CN103236667B CN103236667B CN201310179443.7A CN201310179443A CN103236667B CN 103236667 B CN103236667 B CN 103236667B CN 201310179443 A CN201310179443 A CN 201310179443A CN 103236667 B CN103236667 B CN 103236667B
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Abstract
The invention provides a kind of supply line lightening arresting method: install install drop type overvoltage protection device respectively at substation exit line bar, terminal pole, equipment place A, B, C three-phase, A, B, C item of the line bar in the line adopts S " shape installation overvoltage protection device.The installation method of a kind of overvoltage protection device of the present invention has the advantage that equipment investment is few, lightning protection effect is good.
Description
Technical field
The present invention relates to electric power conveying technology field, particularly relate to a kind of supply line lightening arresting method for power distribution network supply line.
Background technology
Along with expanding economy, the requirement of power consumer to power system power supply reliability is more and more higher, power distribution network is the important component part of electric power system, by strengthening operational management, strengthen dynamics of investment, improve the power supply quality of power distribution network, can increase substantially the power supply reliability of electric power system, a lot of potential safety hazard also can be eliminated in time.But natural calamity, the fault outage phenomenon caused of being especially struck by lightning still is difficult to control, and carries out distribution line Thunder Protection, reduces the emphasis that thunderbolt power failure is power distribution network operational management work.The mounting means of circuit lightening protection installation of the prior art--overvoltage protection device is generally A, B, C tri-installation one group of three overvoltage protection device of a line bar; after three-phase ground end connects; draw ground connection again; as shown in Figure 1; keep at a certain distance away; next group is installed again; if this mounting means three-phase line is struck by lightning simultaneously; three-phase line simultaneously earial drainage just there will be three-phase shortcircuit; due to impedance very little (line impedance can be ignored); line short circuit current is very large, route protection will be caused to trip, cause fault outage.This mounting means needs to be equipped with more voltage protector in addition, adds equipment cost and installation and maintenance cost.
Therefore, necessaryly a kind of new supply line's lightening arresting method is provided to solve above-mentioned technical problem.
Summary of the invention
Technical problem solved by the invention is to provide a kind of supply line lightening arresting method, equipment investment is few, lightning protection effect is good advantage that it has.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of supply line lightening arresting method comprises:
1) at substation exit line bar A, B, C three-phase, 1-2 group drop-type arrester is installed, at circuit terminal pole A, B, C three-phase, one group of drop-type arrester is installed;
2) at line facility place (vacuum circuit-breaker, high pressure measurement etc.) both sides A, B, C three-phase, one group of drop-type arrester is installed respectively, at line branch point, capacitor, cable end import and export A, B, C three-phase, one group of drop-type arrester is respectively installed;
3) in the line between A, B, C item of line bar adopt S " shape installs distribution type overvoltage protection device; concrete grammar is as follows: install a distribution type overvoltage protection device in the second line bar place B phase; install a distribution type overvoltage protection device every a base bar (within 100M) in the 4th line bar C phase; to get along installation distribution type overvoltage protection device at the 6th bar A every a base bar downwards; repetitive cycling arrangement downwards successively, and distribution type overvoltage protection device A, B, C three-phase is in the line installed and reached serpentine and install effect.
Wherein said distribution type overvoltage protection device is the overvoltage protection device with discharging gap, and drop-type arrester is the zinc oxide arrester with disconnector.
Compared with prior art; a kind of supply line of the present invention lightening arresting method; because make use of by overvoltage protection device earth resistance; add the impedance of short dot; can suppress the size of three short circuit current, the insulator arc-over time is very short will recover, and decreases trip phenomenon occurrence probability; the S shape installation method of distribution type overvoltage protection device, decreases equipment investment simultaneously.
Accompanying drawing explanation
Fig. 1 is supply line of the prior art lightening arresting method schematic diagram.
Fig. 2 is a kind of supply line of the present invention lightening arresting method schematic diagram.
1 line bar, 2 drop-type arresters, 3 distribution type overvoltage protection devices in figure.
Embodiment
Refer to shown in Fig. 2, the invention provides a kind of supply line lightening arresting method, it comprises and comprising the steps:
1) at substation exit line bar A, B, C three-phase, 1-2 group drop-type arrester 2 is installed, at circuit tag wire bar A, B, C three-phase, one group of drop-type arrester 2 is installed;
2) at line facility place (vacuum circuit-breaker, high pressure measurement etc.) both sides A, B, C three-phase, one group of drop-type arrester 2 is installed respectively, at line branch point, capacitor, cable end import and export A, B, C three-phase, one group of drop-type arrester 2 is respectively installed;
3) in the line between A, B, C item of line bar adopt S " shape installs distribution type overvoltage protection device 3; concrete grammar is as follows: install a distribution type overvoltage protection device 3 in the second line bar place B phase; install a distribution type overvoltage protection device 3 every a base bar (within 100M) in the 4th line bar C phase; to get along installation distribution type overvoltage protection device 3 at the 6th bar A every a base bar downwards; repetitive cycling arrangement downwards successively, and distribution type overvoltage protection device A, B, C three-phase is in the line installed and reached serpentine and install effect.
Wherein distribution type overvoltage protection device is the overvoltage protection device with discharging gap, and drop-type arrester is the zinc oxide arrester with disconnector.
The protection range of overvoltage protection device determines primarily of the waveform steepness of lightning overvoltage, thunder and lightning high pressure is invaded by circuit side, voltage wave propagation velocity is the 300m/ μ s(light velocity), overvoltage ripple needs a/300(μ s by insulator to overvoltage protection device) time, after overvoltage protection device action, voltage wave insulator of turning back also needs a/300(μ s), time delay a/150(μ s); Overvoltage protection device protection range is relevant with the lightning current wave head time; this value major part is in the scope of 2-10 μ s; when most electrical network regulations stipulate suggestion calculates, the lightning current wave head time gets 2.6 μ s; for improving reliability; can calculate by 2 μ s; according to S=vt formula (distance=speed x time), S=150*2=300 rice.Namely the protection range of overvoltage protection device is 300 meters.
If circuit is struck by lightning, three-phase line simultaneously earial drainage just there will be three-phase shortcircuit, due to impedance very little (line impedance can be ignored), line short circuit current is very large, route protection will be caused to trip, solving the key of trip problem is increase a resistance with Limited Current letting out in thunder passage, the earth resistance of overvoltage protection device is utilized to realize, by fast tripping protection value 800 amperes calculating, X=U/ √ 3*Id=6.3/1.732*0.8=4.55(Ω) known by calculating, as long as ensure that letting out thunder passage middle impedance is greater than 4.55 Ω, known by the analysis of overvoltage protection device protection range, the protection range of overvoltage protection device can reach about 300 meters, the every base distance between tie rods of distribution line is generally 50-60 rice, therefore the mode that every base bar can be taked only to fill an overvoltage protection device realizes, regulations stipulate overvoltage protection device earth resistance is generally at 10 below Ω, utilize the earth resistance of 2 overvoltage protection devices, after circuit three-phase is struck by lightning simultaneously, although there will be three-phase shortcircuit phenomenon, because of the earth resistance by overvoltage protection device, add the impedance of short dot, the size of three short circuit current can be suppressed, even if lightning strike spot also can suppress below the protection value of short circuit current first section of circuit, calculate by every lightning arrester (overvoltage protection device) earth resistance 4 Ω: three short circuit current Id=U/ √ 3*X
l=6.3/1.732*8=455 (A) now power frequency short circuit current only has 455 amperes, is less than quick-break even overcurrent overprotection definite value, can realizes circuit and not trip.Power frequency continued flow is likely greater than overload setting value, and because overload protection needs the long period, the insulator arc-over time is very short will recover, and can not trip.
A kind of supply line of the present invention lightening arresting method; because make use of the earth resistance by overvoltage protection device; add the impedance of short dot; the size of three short circuit current can be suppressed; the insulator arc-over time is very short will recover; decrease trip phenomenon occurrence probability, the S shape installation method of distribution type overvoltage protection device, achieves the object reaching best lightning protection effect by minimum input simultaneously.
The above; it is only most preferred embodiment of the present invention; not any pro forma restriction is done to the present invention; any those of ordinary skill in the art; do not departing under technical solution of the present invention ambit; utilize the method content of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, all belong to the scope of claims protection.
Claims (2)
1. supply line's lightening arresting method, is characterized in that, comprises the steps:
1) at substation exit line bar A, B, C three-phase, 1-2 group drop-type arrester is installed, at circuit terminal pole A, B, C three-phase, one group of drop-type arrester is installed;
2) at both sides, line facility place A, B, C three-phase, one group of drop-type arrester is installed respectively, at line branch point, capacitor, cable end import and export A, B, C three-phase, one group of drop-type arrester is respectively installed;
3) in the line between A, B, C phase of line bar adopt serpentine that distribution type overvoltage protection device is installed; concrete grammar is as follows: install a distribution type overvoltage protection device in the second line bar place B phase; in the 4th line bar C phase, a distribution type overvoltage protection device is installed every a base bar; to get along installation distribution type overvoltage protection device at the 6th bar A every a base bar downwards; repetitive cycling arrangement downwards successively, distribution type overvoltage protection device A, B, C three-phase is in the line installed and is reached serpentine installation effect.
2. a kind of supply line according to claim 1 lightening arresting method, is characterized in that: described distribution type overvoltage protection device is the overvoltage protection device with discharging gap, and drop-type arrester is the zinc oxide arrester with disconnector.
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| CN201310179443.7A CN103236667B (en) | 2013-05-15 | 2013-05-15 | A kind of supply line lightening arresting method |
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| CN201310179443.7A CN103236667B (en) | 2013-05-15 | 2013-05-15 | A kind of supply line lightening arresting method |
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| CN103236667B true CN103236667B (en) | 2015-08-26 |
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| RU2312441C2 (en) * | 2002-03-05 | 2007-12-10 | Оао "Нпо "Стример" | Power transmission line |
| CN101499638B (en) * | 2009-03-13 | 2010-12-29 | 国网电力科学研究院 | Method for improving lightning protection capability of ultra- extra-high voltage transmission line |
| CN102664376A (en) * | 2012-04-10 | 2012-09-12 | 辽宁省电力有限公司抚顺供电公司 | Lightning protection method of lightning arresters on 10-KV distribution line |
| CN102882201B (en) * | 2012-10-19 | 2015-03-18 | 广州供电局有限公司 | Lightning protection method based on different grounding modes of neutral points of 10kV distribution network |
| CN102969685A (en) * | 2012-12-12 | 2013-03-13 | 上海市电力公司 | Method for improving lightning prevention and resisting level of overhead power distribution line |
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