CN103439602A - Thunder trip-out rate calculating method for distributing line - Google Patents

Abstract

The invention provides a thunder trip-out rate calculating method for a distributing line. According to the method, calculation is carried out according to thunderbolt statistical data of a thunder locating system, accurate paths of a distributing line corridor of a GIS system, classification of direct thunder and inductive thunder and region distributing line equipment technical levels, and correction is carried out according to the 10kV line operating standard, so that the thunder trip-out rate of a region distribution network is obtained to be the sum of the trip-out rate of the direct thunder and the trip-out rate of the inductive thunder. According to the method, statistic of all thunderbolt situations of the line corridor of the distributing line within the special time can be carried out according to the data of the two systems, the line technical equipment levels are combined, and a direct thunder model and an inductive thunder model of the distributing line are respectively set up for carrying out calculation, so that the line thunder trip-out probability is obtained. According to the method, the accurate thunder trip-out rate of the distribution network can be obtained, the accurate data can be provided for thunder-prevention assessment, and the method is suitable for calculating the thunder trip-out rate of the distributing line.

Description

A kind of distribution line lightning trip-out rate computing method

Technical field

The present invention relates to a kind of computing method of distribution line lightning trip-out rate, especially relate to a kind of based on the accurate path of lightning location system thunderbolt statistics and generalized information system distribution line corridor, calculated and, according to the regional distribution network lightning trip-out rate computing method that 10kV circuit operating standard etc. is revised, belonged to power circuit shocking preventing technology field by direct lightning strike and induction thunder classification calmodulin binding domain CaM distribution line equipment and technology level.

Background technology

Thunder and lightning is that one of disaster frequently occurs, and has a strong impact on the safe and stable operation of electric system.Thunderbolt at present remains the primary factor that causes the distribution line tripping operation, and the annual lightning stroke trip accident in various places accounts for 40%～70% of total trip accident.The Jiangxi Area lightening activity is frequent, and sudden strain of a muscle density in ground is higher, and distribution line lightning stroke trip situation is more serious.And distribution line is low due to dielectric level, not only be subject to the impact of direct lightning strike, also may insulator arc-over occur because of the induced overvoltage that thunderbolt ground produces simultaneously.Compare ultra-high-tension power transmission line, the easier lightning strikes flashover tripping operation of distribution line.The tripping operation of part lightning stroke flashover is afterwards without sharp trace, be difficult to trip reason is confirmed, therefore, the theoretical distribution line lightning trip-out rate that calculates is grasped distribution line thunder and lightning tripping operation actual conditions for electric company, assessment and grasp distribution line lightning protection properties and lightning stroke flashover risk, promote the distribution lightning Protection Design, arrange that the measure of distribution shocking preventing technology is of great significance.

The standard of always continuing to use in the distribution lightning Protection Design and rules and computing method all generally lack practical thunder and lightning measured data, and lightening activity and geographical situation, climate relationship are very large, zones of different, Various Seasonal lightning parameter feature may differ larger, traditional parameters follow the example of can not overall scientific ground the lightening activity in a certain area of reflection.The shortage of lightning parameter makes band when selecting the weak section of line thunder protection to implement lightning protection measures bear the character of much blindness, and its Technical Economy is not high, and lightning protection calculation does not have otherness, can not reflect the lightning protection properties of concrete concrete circuit of time period.In the lightning protection calculation appraisal procedure, comprehensive, the comprehensively consideration of shortage to different section lightening activity othernesses along the line, environmental characteristic otherness, line construction otherness, also lack the accurate foundation to models such as lightning discharge passage, insulator arc-over processes, assessment result can't definitely reflect the risk of circuit lightning fault, can not determine each factor role that affects lightning stroke flashover.

Release along with lightning location system, in certain section time inner region, all thunderbolt quantity and place can be prepared record, and generalized information system has recorded accurate path, distribution line corridor, according to two system datas, can be added up all thunderbolt situations of circuit corridor range in the distribution line special time, combined circuit technical equipment level, set up respectively distribution line direct lightning strike and induction thunder tripping operation model and calculate and can draw the circuit thunder and lightning probability that trips.

Summary of the invention

The objective of the invention is, the deficiency existed in calculating according to existing lightning trip-out rate, this method proposes a kind of based on lightning location system thunderbolt statistics and generalized information system distribution line routing information, by setting up respectively direct lightning strike and induction thunder computing formula, draw the distribution line lightning trip-out rate, can be analyzed this circuit thunder and lightning trip condition according to the distribution line lightning trip-out rate, be instructed the distribution line Thunder Protection.

Technical scheme of the present invention is, the present invention sets up respectively the lightning trip-out rate computing formula according to direct lightning strike and induction thunder, Parameters in Formula derives from lightning location system, generalized information system statistics and distribution network line technical equipment parameter, also comprise correction factor in computing formula, according to distribution line operating standard etc., be configured, revised direct lightning strike trip-out rate can draw more accurate distribution line tripping rate with lightning strike with the addition of induction thunder trip-out rate.

The present invention is based on the accurate path of lightning location system thunderbolt statistics and generalized information system distribution line corridor, the regional distribution network lightning trip-out rate computing method of being calculated and being revised according to 10kV circuit operating standard etc. by direct lightning strike and induction thunder classification calmodulin binding domain CaM distribution line equipment and technology level, and revised according to 10kV circuit operating standard, obtaining the regional distribution network lightning trip-out rate is direct lightning strike trip-out rate and induction thunder trip-out rate sum.Described computing method are:

1, direct lightning strike trip-out rate computing method

$X_z=\mathrm{\ηB}=100\mathrm{A\η}(b+{4h}_c)\×{10}^{\frac{{-U}_{50\%}}{8800}}$

In formula, X _z: the direct lightning strike trip-out rate; η: probability of sustained arc; A: the year thunderbolt quantity of every square kilometre; B: the distance between two limit wires, unit is m; h _c: the wire suspension height; U _50%: the impact dielectric level of line insulator.

2, the computing method of induction thunder trip-out rate

$X_g=200\mathrm{\ηA}{\∫}_{s_{\min }}^{s_{\max }}{10}^{\frac{-U_{50\%}}{25\×h_c\×88}x}\mathrm{dx}=200\mathrm{\ηA}\×\left(\frac{{10}^{\frac{-U_{50\%}\×S_{\max }}{25\×h_c\×88}}-{10}^{\frac{-U_{50\%}\×S_{\min }}{25\×h_c\×88}}}{\ln \left({10}^{\frac{-U_{50\%}}{25\×h_c\×88}}\right)}\right)$

In formula: X _g: induction thunder trip-out rate; η: probability of sustained arc; A: the year thunderbolt quantity of every square kilometre; h _c: the wire suspension height; U _50%: the impact dielectric level of line insulator; S _min: desirable circuit is subject to the edge minor increment of thunder face; S _max: desirable circuit is subject to the edge ultimate range of thunder face; X: lightning strike spot is apart from the horizontal range of circuit.

3, calculate and revise:

According to constituent parts distribution line operating standard difference, in computing formula, the parameter setting can be done corresponding correction, some unit, for controlling the distribution line trip-out rate, will recover power transmission later at thunder and lightning weather after line tripping, now thunderbolt quantity in the certain hour interval should be thought 1 time; According to the thunderstorm characteristic, the certain hour interval can be selected from the daytime thunderbolt and occur latter 2 hours, after optional thunderbolt at night occurs to 5 o'clock early mornings of second day.

4, circuit lightning trip-out rate

X＝X _z+X _g

The invention has the beneficial effects as follows, the present invention is based on the accurate path of lightning location system thunderbolt statistics and generalized information system distribution line corridor, by direct lightning strike and induction thunder classification calmodulin binding domain CaM distribution line equipment and technology level, calculated, according to two system datas, can be added up all thunderbolt situations of circuit corridor range in the distribution line special time, combined circuit technical equipment level, set up respectively distribution line direct lightning strike and induction thunder tripping operation model and calculate and can draw the circuit thunder and lightning probability that trips.The method can obtain power distribution network lightning trip-out rate more accurately, to the lightning protection assessment, can provide accurate data.

The present invention is applicable to the distribution line lightning trip-out rate and calculates.

The accompanying drawing explanation

Fig. 1 is distribution line lightning trip-out rate calculation flow chart of the present invention.

Embodiment

Following embodiment is that the present invention is described in further detail.

1, direct lightning strike trip-out rate computing method

The direct lightning strike superpotential is hit overhead transmission line by thundercloud discharge and is produced, and because the distribution line dielectric level is low, phase spacing is little, direct lightning strike easily causes heterogeneous flashover.

When the direct lightning strike tripping operation is calculated, will be subject to the thunderbolt within the thunder face all to be considered as direct lightning strike at circuit.

The thunder area S that is subject to of the long 10kV overhead transmission line of 100km is:

S＝100(b+4h _c)

In formula: b: the distance between two limit wires generally is taken as 0.001km;

H _c: the wire suspension height generally is taken as 0.01km;

If the year thunderbolt quantity of every square kilometre is A, A derives from the lightning location system statistics,

The long 10kV overhead transmission line of 100km be subject to the thunder area in thunderbolt number N be:

N＝SA＝100A(b+4h _c)；

If the impact dielectric level of line insulator is U _50%, according to DL/T620-1997 " overvoltage protection of alternating-current electric device and Insulation Coordination ", U _50%=100kV, the lightning withstand level I of circuit is: I=U _50%/ 100.

In N thunder, amplitude of lightning current over the probability P of I is:

The thunder and lightning number B that in N thunder, can cause insulator arc-over is:

$B=\mathrm{Np}=100A(b+4h_c)\×{10}^{\frac{-U_{50\%}}{8800}};$

If the probability of sustained arc during circuit lightning stroke flashover is η, according to DL/T620-1997 " overvoltage protection of alternating-current electric device and Insulation Coordination ", η gets 0.22, the direct lightning strike trip-out rate X of circuit _zfor:

$X_z=\mathrm{\ηB}=100\mathrm{A\η}(b+{4h}_c)\×{10}^{\frac{{-U}_{50\%}}{8800}}$

2, induction thunder trip-out rate computing method

Thunder and lightning induction voltage hits near overhead transmission line object on the earth or ground by thunder and lightning, by electromagnetic induction, produces on the line.Thunder and lightning induction voltage polarity on three-phase conducting wire is identical, amplitude is close can directly not cause phase fault, but easily causes heterogeneous flashover over the ground.

When lightning strike spot is x(x>65m apart from the horizontal range of circuit) time, the lightning induced voltage amplitude produced on wire in the time of can calculating near the earth thunderbolt circuit by following formula:

$u_g=25\×\frac{I\×h_c}{x}\left(\mathrm{kV}\right)$

In formula: u _g---lightning induced voltage amplitude (kV);

I---amplitude of lightning current (kA);

H _c---wire suspension height (m);

S---lightning strike spot is apart from the horizontal range (m) of circuit;

In order to simplify, below estimation is all calculated the lightning induced voltage beyond circuit is subject to the thunder face by above formula.Amplitude of lightning current surpasses the probability of I and presses p=10 ^-I/88calculate.

If the impact dielectric level of line insulator is ug=U50%, according to formula (2), can tries to achieve and at the x place, make the amplitude of lightning current of insulator arc-over be:

$I=\frac{U_{50\%}}{25\×h_c}x\left(\mathrm{kA}\right)$

For the increment dx of distance circuit X, the area of per 100 km circuit both sides is: 2*100dx;

If the thunderbolt number of every square kilometre is A, A can add up acquisition by lightning location system, and the thunderbolt number of times in this area is: 200Adx;

In 200Adx thunderbolt, amplitude of lightning current surpasses the probability of I and is:

$p={10}^{-I/88}={10}^{-\frac{U_{50\%}}{25\×h_c\×88}x};$

The thunder number B that amplitude of lightning current surpasses I in 200Adx thunder is:

$B=200\mathrm{Adx}\×{10}^{-\frac{U_{50\%}}{25\×h_c\×88}x};$

If the probability of sustained arc during line insulator lightning stroke flashover is η, cause that the thunder number of line tripping is:

$\mathrm{\ηB}=\mathrm{\η}\×200\mathrm{Adx}\×{10}^{-\frac{U_{50\%}}{25\×h_c\×88}x};$

If the induction thunder is from X=S _mincount to X=S _maxfinish S _maxthunder is in addition ignored, and the induction thunder trip-out rate of circuit is:

$X_g=200\mathrm{\ηA}{\∫}_{s_{\min }}^{s_{\max }}{10}^{\frac{-U_{50\%}}{25\×h_c\×88}x}\mathrm{dx}=200\mathrm{\ηA}\×\left(\frac{{10}^{\frac{-U_{50\%}\×S_{\max }}{25\×h_c\×88}}-{10}^{\frac{-U_{50\%}\×S_{\min }}{25\×h_c\×88}}}{\ln \left({10}^{\frac{-U_{50\%}}{25\×h_c\×88}}\right)}\right)$

Above S during calculating _min(km) desirable circuit is subject to the edge of thunder face, general desirable 0.02, S _maxget 0.5km, the thunder beyond 0.5km can be ignored.(establish the U of insulator _50%=100kV, cause at the 0.5km place that the lightning current of insulator arc-over is greater than 200kA, and the probability that lightning current is greater than 200kA is 0.53%, and therefore the thunder beyond 0.5km can be ignored).

3, calculate and revise

According to constituent parts distribution line operating standard difference, in computing formula, the parameter setting can be done corresponding correction, for controlling the distribution line trip-out rate, after line tripping, will recover power transmission later at thunder and lightning weather as some unit, now thunderbolt quantity in the certain hour interval should be thought 1 time.

4, circuit lightning trip-out rate: the circuit lightning trip-out rate is direct lightning strike trip-out rate and induction thunder trip-out rate sum.That is: X=X _z+ X _g.

Claims (4)

1. the computing method of a distribution line lightning trip-out rate, it is characterized in that, described method is according to the accurate path of lightning location system thunderbolt statistics and generalized information system distribution line corridor, by direct lightning strike and induction thunder classification calmodulin binding domain CaM distribution line equipment and technology level, calculated, and revised according to 10kV circuit operating standard, obtaining the regional distribution network lightning trip-out rate is direct lightning strike trip-out rate and induction thunder trip-out rate sum.

2. the computing method of a kind of distribution line lightning trip-out rate according to claim 1, is characterized in that, the computing formula of described direct lightning strike trip-out rate is:

$X_z=\mathrm{\ηB}=100\mathrm{A\η}(b+{4h}_c)\×{10}^{\frac{{-U}_{50\%}}{8800}}$

In formula, X _z: the direct lightning strike trip-out rate; η: probability of sustained arc; A: the year thunderbolt quantity of every square kilometre; B: the distance between two limit wires, unit is m; h _c: the wire suspension height; U _50%: the impact dielectric level of line insulator.

3. the computing method of a kind of distribution line lightning trip-out rate according to claim 2, is characterized in that, the computing formula of described induction thunder trip-out rate is:

$X_g=200\mathrm{\ηA}{\∫}_{S_{\min }}^{S_{\max }}{10}^{\frac{{-U}_{50\%}}{25\×h_c\×88}x}\mathrm{dx}=200\mathrm{\ηA}\×\left(\frac{{10}^{\frac{{-U}_{50\%}\×S_{\max }}{25\×h_c\×88}}-{10}^{\frac{{-U}_{50\%}\×S_{\min }}{25\×h_c\×88}}}{\ln \left({10}^{\frac{{-U}_{50\%}}{25\×h_c\×88}}\right)}\right)$

In formula: X _g: induction thunder trip-out rate; η: probability of sustained arc; A: the year thunderbolt quantity of every square kilometre; h _c: the wire suspension height; U _50%: the impact dielectric level of line insulator; S _min: desirable circuit is subject to the edge minor increment of thunder face; S _max: desirable circuit is subject to the edge ultimate range of thunder face; X: lightning strike spot is apart from the horizontal range of circuit.

4. the computing method of a kind of distribution line lightning trip-out rate according to claim 2, it is characterized in that, describedly carry out modification method according to 10kV circuit operating standard and be, for controlling the distribution line trip-out rate, to recover power transmission later at thunder and lightning weather after line tripping, now thunderbolt quantity in the certain hour interval should be thought 1 time; According to the thunderstorm characteristic, the certain hour interval can be selected from the daytime thunderbolt and occur latter 2 hours, after optional thunderbolt at night occurs to 5 o'clock early mornings of second day.

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