CN104682304A - Suburb 10kV power distribution line differentiated lightning-protection method - Google Patents
Suburb 10kV power distribution line differentiated lightning-protection method Download PDFInfo
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- CN104682304A CN104682304A CN201510057123.3A CN201510057123A CN104682304A CN 104682304 A CN104682304 A CN 104682304A CN 201510057123 A CN201510057123 A CN 201510057123A CN 104682304 A CN104682304 A CN 104682304A
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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
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
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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
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/60—Detecting; Measuring; Sensing; Testing; Simulating
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Abstract
The invention relates to a suburb 10kV power distribution line differentiated lightning-protection method. The method comprises the following steps: step 1: collecting electric parameters of a typical suburb 10kV power distribution line and lightning parameters of a line region; step 2: carrying out lightning risk evaluation on the typical suburb 10kV power distribution line; step 3: designing a suburb 10kV power distribution line differentiated lightning-protection scheme according to lightning risk evaluation, line lightning fault counting and a differentiated lightning-protection principle; and step 4: estimating the lightning-protection effect of the suburb 10kV power distribution line differentiated lightning-protection method to determine a finally-adopted differentiated lightning-protection measure. Compared with the prior art, the suburb 10kV power distribution line differentiated lightning-protection method provided by the invention can be used for specifically carrying out differentiated lightning protection on the suburb 10kV power distribution line according to economical, blocked and dredged differentiated lightning-protection principles.
Description
Technical field
The present invention relates to 10kV distribution line shocking preventing technology, especially a kind of suburb 10kV distribution line differentiated lightning protection method.
Background technology
Domestic and international operating experience shows, thunderbolt is the main reason of 10kV line tripping, and serious threat distribution safe and stable operation, reduces power supply reliability.The domestic main lightning strike accident to typical high voltage, extra high voltage network, lightening activity distribution characteristics and relevant topography and geomorphology have in recent years carried out detailed investigation, differentiated lightning protection technology and strategy are proposed, the transmission line located lightening arresting method of such as patent of invention (application number: 201310112586.6) by State Grid Corporation of China for high pressure, extra high voltage network.But be all the differentiated lightning protection method for transmission line in the past, only analyzed the lightning protection effect of individual event lightning protection measures to 10kV distribution line, not for the differentiated lightning protection method of suburb 10kV distribution line.
Summary of the invention
In order to overcome the deficiency of existing suburb 10kV distribution line lightening arresting method, the invention provides a kind of suburb 10kV distribution line differentiated lightning protection method.
The present invention takes following technical scheme to realize above-mentioned purpose:
A kind of suburb 10kV distribution line differentiated lightning protection method, is characterized in that, said method comprising the steps of:
Step 1: the electric parameter and the land lightning parameter that gather typical suburb 10kV distribution line;
Step 2: carry out typical suburb 10kV distribution line Lightning Strike Risk Evaluation;
Step 3: according to Lightning Strike Risk Evaluation, circuit lightning fault statistics and differentiated lightning protection principle, design suburb 10kV distribution line differentiated lightning protection scheme;
Step 4: the protection effect of assessment suburb 10kV distribution line differentiated lightning protection method, determines the final differentiated lightning protection measure adopted.
In described step 1, need the electric parameter obtaining 10kV distribution line to be shaft tower height and earth resistance, tower head geometrical arrangements, line span and insulation level, diameter of wire and D.C. resistance information, land lightning parameter is amplitude of lightning current probability distribution, lightning current waveform and CG lightning density information.
In described step 2, adopt electric geometry method, EMTP EM transient calculation in conjunction with IEEE regular method assessment 10kV distribution line thunderbolt risk.
In described step 3, differentiated lightning protection principle is divided into economical, obstructive type and diverting type.
Described economical be lightning protection measures network minimal, described obstructive type is at utmost to lower lightning outage rate, and described diverting type is at utmost lower circuit lightning fault rate.
In described step 4, foundation grid company and user, to the standard-required of power supply reliability, determine the final differentiated lightning protection measure adopted.
Compared with prior art, the present invention according to the differentiated lightning protection principle of economical, obstructive type and diverting type, can carry out suburb 10kV distribution line differentiated lightning protection targetedly
Accompanying drawing explanation
Fig. 1 is embodiments of the invention flow chart;
Fig. 2 is the present invention
type concrete straight line pole result schematic diagram.
Embodiment
Elaborate to the inventive method below in conjunction with embodiment and accompanying drawing, the present embodiment is implemented by technical solution of the present invention, give detailed execution mode and detailed process, but protection scope of the present invention is not limited thereto embodiment.
As Fig. 1, a kind of suburb 10kV distribution line differentiated lightning protection method, said method comprising the steps of:
Step 1: electric parameter and the land lightning parameter of adding up typical suburb 10kV distribution line.Adopt as shown in Figure 2
type concrete straight line pole, as shown in the figure, pole tower ground resistance 10 Ω, line span gets Shanghai Power Network 10kV circuit exemplary value 60m, totally 20 grades of circuits, overall length 1200m for tower head, bar height.Three-phase conducting wire adopts ZS-JKLYJ-10/150 type insulated conductor, wire diameter 14.6mm, D.C. resistance 0.2 Ω/km, and soil resistivity gets 100 Ω m, and adopt PS-15 pin type supporting insulator without lightning protection measures, 50% critical flashover voltage is 105kV.The circuit direct lightning strike number of times of the shielding reduction of building, the number of lightning strokes around the circuit of increase causes induced lightening trip-out rate to rise, and spacious around suburban line, getting shielding of building coefficient is 0.
What amplitude of lightning current distribution function adopted District of Shanghai lightning location system 2003-2011 to add up is evenly distributed:
In formula, I
frepresent amplitude of lightning current first, kA.
Widely used Heidler function is as lightning current model in the world:
In formula, I
pamplitude of lightning current, kA; η is current amplitude coefficient, gets η=1; N is electric current steepness factor, gets n=5; τ
1and τ
2be respectively wave head and wave rear, waveform is the 3.83/77.5 μ s that ieee standard is recommended.CG lightning density, adopts lightning location system to measure the average CG lightning density 4.76 times/km2/ of 2003 ~ 2011 years District of Shanghais.
Step 2: carry out Typical Urban 10kV distribution line Lightning Strike Risk Evaluation.Adopt electric geometry method, EMTP EM transient calculation in conjunction with IEEE regular method assessment 10kV distribution line thunderbolt risk, trip-out rate 12.35 times/100km/ is attacked directly before drawing line thunder protection transformation, counterattack trip-out rate 7.48 times/100km/, induction trip-out rate 12.86 times/100km/, total trip-out rate 32.6 times/100km/, can show that current line is mainly attacked directly and induced lightening trip risk.
Step 3: according to Lightning Strike Risk Evaluation, circuit lightning fault statistics and differentiated lightning protection principle, design city 10kV distribution line differentiated lightning protection method.
Economical differentiated lightning protection principle object is lightning protection measures network minimal, current line is mainly attacked directly and induced lightening trip risk, can only (select three-phase line lightning arrester is installed by zinc oxide surge arresters for existing circuit, installing space is that 240m is namely every 4 grades of installations), for the newly-built 10kV circuit in suburb, the differentiated lightning protection measure of FXBW10/70 composite insulator (50% critical flashover voltage is 195kV)+zinc oxide surge arresters (install three-phase line lightning arrester, installing space is that 360m is namely every 6 grades of installations) can be adopted.
Obstructive type differentiated lightning protection principle object at utmost lowers lightning outage rate, can adopt the lightening arresting method of lightning arrester (install three-phase line lightning arrester, installing space is that 360m is namely every 6 grades of installations)+lightning conducter.
Diverting type differentiated lightning protection principle object at utmost lowers lightning outage rate, a large amount of installation lightning protection inter space or lightning protection pillar insulator are to reduce lightning-caused breaking rate, but need employing control tripping rate with lightning strike compared with the mode of long gap and significantly reduce lightning-caused breaking rate, adopt modified model lightning protection inter space, 50% critical flashover voltage is 110kV.
Step 4: the protection effect of assessment city 10kV distribution line differentiated lightning protection method.
Calculate the economical differentiated lightning protection of circuit, three-phase line lightning arrester is installed for existing route choosing, installing space is that 240m is namely every 4 grades of installations, trip-out rate 10.71 times/100km/ is attacked directly after transformation, counterattack trip-out rate 5.95 times/100km/, induction trip-out rate 2.14 times/100km/, total trip-out rate 18.80 times/100km/, make the total trip-out rate of circuit reduce by 42%.For the newly-built 10kV circuit in suburb, FXBW10/70 composite insulator (50% critical flashover voltage is 195kV)+zinc oxide surge arresters can be adopted (three-phase line lightning arrester to be installed, installing space is that 360m is namely every 6 grades of installations) differentiated lightning protection measure, trip-out rate 4.84 times/100km/ is attacked directly after transformation, counterattack trip-out rate 1.93 times/100km/, induction trip-out rate 0.58 time/100km/, total trip-out rate 7.35 times/100km/, make the total trip-out rate of circuit reduce by 77%.
Calculate obstructive type differentiated lightning protection method, lightning arrester (installs three-phase line lightning arrester, installing space is that 360m is namely every 6 grades of installations)+lightning conducter transformation after, attack trip-out rate 0 time/100km/ directly, counterattack trip-out rate 2.51 times/100km/, induction trip-out rate 2.01 times/100km/, total trip-out rate 4.52 times/100km/, make the total trip-out rate of circuit reduce by 86%.
Calculate diverting type differentiated lightning protection method, trip-out rate 12.35 times/100km/ is attacked directly, counterattack trip-out rate 7.19 times/100km/, induction trip-out rate 11.42 times/100km/ after transformation, total trip-out rate 30.95 times/100km/, makes the total trip-out rate of circuit reduce by 5%.
Owing to being emphasis user, require high to power supply reliability and the quality of power supply, therefore newly-built circuit is adopted to the differentiated lightning protection measure of FXBW10/70 composite insulator (50% critical flashover voltage is 195kV)+zinc oxide surge arresters (install three-phase line lightning arrester, installing space is that 360m is namely every 6 grades of installations).
Claims (6)
1. a suburb 10kV distribution line differentiated lightning protection method, is characterized in that, said method comprising the steps of:
Step 1: the electric parameter and the land lightning parameter that gather typical suburb 10kV distribution line;
Step 2: carry out typical suburb 10kV distribution line Lightning Strike Risk Evaluation;
Step 3: according to Lightning Strike Risk Evaluation, circuit lightning fault statistics and differentiated lightning protection principle, design suburb 10kV distribution line differentiated lightning protection scheme;
Step 4: the protection effect of assessment suburb 10kV distribution line differentiated lightning protection method, determines the final differentiated lightning protection measure adopted.
2. a kind of suburb according to claim 1 10kV distribution line differentiated lightning protection method, it is characterized in that, in described step 1, need the electric parameter obtaining 10kV distribution line to be shaft tower height and earth resistance, tower head geometrical arrangements, line span and insulation level, diameter of wire and D.C. resistance information, land lightning parameter is amplitude of lightning current probability distribution, lightning current waveform and CG lightning density information.
3. a kind of suburb according to claim 1 10kV distribution line differentiated lightning protection method, is characterized in that, in described step 2, adopts electric geometry method, EMTP EM transient calculation in conjunction with IEEE regular method assessment 10kV distribution line thunderbolt risk.
4. a kind of suburb according to claim 1 10kV distribution line differentiated lightning protection method, is characterized in that, in described step 3, differentiated lightning protection principle is divided into economical, obstructive type and diverting type.
5. a kind of suburb according to claim 4 10kV distribution line differentiated lightning protection method, it is characterized in that, described economical be lightning protection measures network minimal, described obstructive type is at utmost to lower lightning outage rate, and described diverting type is at utmost lower circuit lightning fault rate.
6. a kind of suburb according to claim 1 10kV distribution line differentiated lightning protection method, is characterized in that, in described step 4, foundation grid company and user, to the standard-required of power supply reliability, determine the final differentiated lightning protection measure adopted.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107546639A (en) * | 2017-08-18 | 2018-01-05 | 国网湖南省电力公司 | A kind of distribution transmission line of electricity remodeling method and device |
| CN112653063A (en) * | 2020-12-17 | 2021-04-13 | 长沙理工大学 | 10kV overhead line lightning protection method used by matching of coupling ground wire and lightning arrester |
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- 2015-02-03 CN CN201510057123.3A patent/CN104682304A/en active Pending
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| JP2006050708A (en) * | 2004-08-02 | 2006-02-16 | Chubu Electric Power Co Inc | Thunder-resistant reinforcing wire for aerial wire and its design method, and thunder-resistant reinforcement method for the aerial wire |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546639A (en) * | 2017-08-18 | 2018-01-05 | 国网湖南省电力公司 | A kind of distribution transmission line of electricity remodeling method and device |
| CN112653063A (en) * | 2020-12-17 | 2021-04-13 | 长沙理工大学 | 10kV overhead line lightning protection method used by matching of coupling ground wire and lightning arrester |
| CN112653063B (en) * | 2020-12-17 | 2022-07-29 | 长沙理工大学 | Lightning protection method for 10kV overhead line used by matching coupling ground wire and lightning arrester |
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