CN107064677A - A kind of method for differentiating transmission line lightning stroke flashover and non-flashover - Google Patents
A kind of method for differentiating transmission line lightning stroke flashover and non-flashover Download PDFInfo
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- CN107064677A CN107064677A CN201710216413.7A CN201710216413A CN107064677A CN 107064677 A CN107064677 A CN 107064677A CN 201710216413 A CN201710216413 A CN 201710216413A CN 107064677 A CN107064677 A CN 107064677A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention relates to a kind of method for differentiating transmission line lightning stroke flashover and non-flashover, belong to Relay Protection Technology in Power System field.When transmission line of electricity is struck by lightning, the zero-sequence current of circuit is obtained from bus measuring point；Zero-sequence current after thunderbolt occurs in 7ms carries out fitting a straight line, it regard the absolute value of the zero-sequence current waveform slope after fitting a straight line as criterion, by comparing the magnitude relationship between zero-sequence current waveform slope absolute value and setting threshold values, the differentiation of transmission line lightning stroke flashover and non-flashover is realized.The present invention can effectively recognize lightning stroke flashover and the non-flashover that is struck by lightning, with higher reliability.
Description
Technical field
The present invention relates to a kind of method for differentiating transmission line lightning stroke flashover and non-flashover, belong to relay protection of power system
Technical field.
Background technology
Thunderbolt is the one of the main reasons for causing transmission line of electricity to trip.Traveling-wave protection and transient based protection can utilize failure production
The high fdrequency component enriched in raw transient signal quickly recognizes failure, and cuts off circuit rapidly, but in the thunderbolt non-flashover feelings of circuit
Under condition, a large amount of high fdrequency components are included in transient-wave, harmful effect may be produced to traveling-wave protection and transient based protection.Thunder and lightning is done
A usually unipolar pulse ripple is disturbed, main frequency is in hundreds of more than kHz.For the traditional protection based on power frequency amount, institute of being struck by lightning
The high fdrequency component of generation can be filtered as interference, therefore thunderbolt interference influences little to the traditional protection based on power frequency amount.But
Transient signal caused by thunderbolt interference and lightning fault is all high-frequency signal, and traveling-wave protection only has correct differentiation with transient based protection
The flashover of thunderbolt and non-flashover, are just avoided that the malfunction of protection.Therefore, correct decision lightning stroke flashover and non-flashover are traveling-wave protections
One of key issue that must be solved with transient protection.
The content of the invention
The technical problem to be solved in the present invention causes in order to avoid thunderbolt interference to traveling-wave protection and transient based protection
Harmful effect, and then avoid bringing it about malfunction, a kind of differentiation transmission line lightning stroke flashover of proposition and the method for non-flashover.
The technical scheme is that：A kind of method for differentiating transmission line lightning stroke flashover and non-flashover, works as transmission line of electricity
When being struck by lightning, the zero-sequence current of circuit is obtained from bus measuring point；Zero-sequence current after thunderbolt occurs in 7ms carries out straight line
Fitting, using the absolute value of the zero-sequence current waveform slope after fitting a straight line as criterion, by comparing zero-sequence current waveform slope
Magnitude relationship between absolute value and setting threshold values, realizes the differentiation of transmission line lightning stroke flashover and non-flashover.
The method of discrimination is concretely comprised the following steps：
(1) when transmission line of electricity is struck by lightning, the zero-sequence current of circuit is obtained from line end measuring point；
(2) zero-sequence current after thunderbolt occurring in 7ms carries out fitting a straight line, is drawn according to fitting a straight line formula after fitting
Linear equation be yi=kxi+ b, straight slope is k, and fitting a straight line formula is as follows：
In formula, xiFor ith sample point, yiFor the respective value of straight line ith sample point after fitting, m is sampled point number；
(3) by emulation experiment, the threshold values of slope k is determinedLightning stroke flashover is carried out by following condition with non-flashover to differentiate：
IfThen it is determined as lightning stroke flashover；
IfThen it is determined as the non-flashover of thunderbolt.
In the present invention, slope k and threshold values of the zero-sequence current waveform after fitting a straight lineSetting, be all by a large amount of
System simulation experiments, finally find out appropriate numerical value, be used as the foundation compared.
The present invention principle be：
First, theory analysis
When the non-flashover of thunderbolt occurs for transmission line of electricity in system shown in Figure 2, the zero sequence of thunderbolt circuit is measured from bus measuring point
Electric current.Zero-sequence current now is lightning current traveling wave transient caused by wire of injection wire, because wire transformer
It is joined directly together, transformer can be equivalent to a perceptual border, and the lightning current traveling wave rich in high frequency fault component is on perceptual border
Reflectance factor is negative, the back wave of boundary and the opposite polarity of incidence wave.So zero-sequence current waveform is around ripple above and below 0 axle
Move, and 0 axle repeatedly intersects, the absolute value of slope k of the zero-sequence current waveform after fitting a straight line after failure in short time-window is non-
It is often small.And when lightning flash over failure occurs for transmission line of electricity, gained zero-sequence current is the lightning current and fault current of injection wire
Sum.After lightning stroke flashover occurs for transmission line of electricity, zero-sequence current is the superposition of arcing fault electric current and lightning current traveling wave, because this
When zero-sequence current include power frequency fault current, the electric current of failure phase conductor is propagated by wire-ground return circuit, so after a failure
In short time-window, zero-sequence current waveform is inclined to the side of 0 axle, the absolute value of slope k of the zero-sequence current waveform after fitting a straight line
It is larger.
When transmission line lightning stroke does not dodge, zero-sequence current is positive and negative on 0 axle alternately to be changed, after a failure in short time-window, zero sequence
The absolute value of slope k of the current waveform after fitting a straight line is smaller.During transmission line lightning stroke flashover, by power frequency fault current shadow
Ring, after a failure in short time-window, thunderbolt circuit zero sequence current waveform is in being monotonically changed, and zero-sequence current waveform is after fitting a straight line
Slope k absolute value it is larger.According to zero-sequence current waveform in the case of lightning stroke flashover and the non-flashover that is struck by lightning after fitting a straight line
The size of the absolute value phase of slope k, can differentiate lightning stroke flashover and the non-flashover that is struck by lightning.If measuring thunderbolt circuit from bus measuring point
Zero-sequence current, equation after fitting a straight line is yi=kxi+ b, then
X in formulaiFor ith sample point, yiFor the respective value of straight line ith sample point after fitting, m is sampled point number, k
For the slope of curve.
By a large amount of simulation calculations, in transmission line of electricity by circuit diverse location and the different voltage phase angle feelings of being struck by lightning when being struck by lightning
Under condition, ask for surveying the absolute value of zero-sequence current waveform slope k after fitting a straight line in 7ms after thunderbolt respectively such as Fig. 5 and Fig. 6
It is shown.
In Fig. 5,1. representative thunderbolt shaft tower causes the k values in the case of insulator arc-over, 2. represents in thunderbolt lightning conducter span
Centre causes the k values in the case of insulator arc-over, and 3. representative thunderbolt wire causes the k values in the case of insulator arc-over, 4. represents thunder
Hit and do not cause k values in the case of insulator arc-over.Fig. 6 represents the k values for occurring in the case of lightning stroke flashover during out of phase.
It is can be seen that with reference to Fig. 5 and Fig. 6 in the case of thunderbolt does not cause insulator arc-over, by the zero sequence of fitting a straight line
The absolute value of current waveform slope k is less than 0.5 × 10-4, and in the case of thunderbolt causes insulator arc-over, by fitting a straight line
Zero-sequence current waveform slope k absolute value is more than 1 × 10-4.IfFor lightning stroke flashover and the threshold value of non-flashover criterion, k
<1×10-4When be determined as the non-flashover of thunderbolt, k >=1 × 10-4When be determined as lightning stroke flashover.
2nd, criterion characteristic quantity is asked for
1st, gathered data：When transmission line of electricity is by being struck by lightning, the zero-sequence current of thunderbolt line circuit is measured from bus measuring point, is carried
Take after thunderbolt power transmission line zero-sequence electric current time domain waveform in 7ms.
2nd, zero-sequence current waveform in 7ms is subjected to fitting a straight line, it is determined that equation y after fittingi=kxi+ b, according to linear equation
The absolute value of slope k can differentiate whether transmission line of electricity occurs lightning stroke flashover
3rd, lightning stroke flashover and non-flashover criterion
In the case of the non-flashover of transmission line lightning stroke, zero-sequence current alternately changes in 0 axle in positive and negative, after a failure short time-window
Interior, the absolute value of slope k of the zero-sequence current waveform after fitting a straight line is smaller.Transmission line of electricity in the case of lightning stroke flashover, by
Power frequency fault current influences, after a failure in short time-window, and the fault component of thunderbolt phase current deviates to 0 axle side, zero-sequence current
Waveform is in being monotonically changed, and the absolute value of slope k of the zero-sequence current waveform after fitting a straight line is larger.According to lightning stroke flashover and thunder
The size of zero-sequence current waveform absolute value phase of slope k after fitting a straight line in the case of non-flashover is hit, can differentiate that thunderbolt is dodged
Network and the non-flashover that is struck by lightning.Therefore, by emulation experiment, slope threshold values of the zero-sequence current waveform after fitting a straight line is set
Defining route selection criterion is：
IfThen it is determined as lightning stroke flashover；
IfThen it is determined as the non-flashover of thunderbolt.
The beneficial effects of the invention are as follows：
1st, the present invention directly can complete the differentiation of lightning stroke flashover and non-flashover using sampled data, it is not necessary to time domain with
Changed between frequency domain；
2nd, the present invention does not need substantial amounts of sampled data, and complete lightning stroke flashover only needs to be compared in 7ms with the differentiation of non-flashover
Zero-sequence current sampled data.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is transmission line of electricity simulation model schematic diagram of the present invention；
Fig. 3 is the curve after the zero-sequence current curve in the case of non-flashover and fitting a straight line that is struck by lightning in the embodiment of the present invention 1；
Fig. 4 is curve after zero-sequence current curve and fitting a straight line in the embodiment of the present invention 2 in the case of lightning stroke flashover；
Fig. 5 is the different k values being struck by lightning under situations and thunderbolt initial angle under the present invention；
Fig. 6 is the k values in the case of out of phase angle under the present invention.
Embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
A kind of method for differentiating transmission line lightning stroke flashover and non-flashover, when transmission line of electricity is struck by lightning, from bus amount
Measuring point obtains the zero-sequence current of circuit；Zero-sequence current after thunderbolt occurs in 7ms carries out fitting a straight line, after fitting a straight line
The absolute value of zero-sequence current waveform slope is as criterion, by comparing between zero-sequence current waveform slope absolute value and setting threshold values
Magnitude relationship, realize the differentiation of transmission line lightning stroke flashover and non-flashover.
The method of discrimination is concretely comprised the following steps：
(1) when transmission line of electricity is struck by lightning, the zero-sequence current of circuit is obtained from line end measuring point；
(2) zero-sequence current after thunderbolt occurring in 7ms carries out fitting a straight line, is drawn according to fitting a straight line formula after fitting
Linear equation be yi=kxi+ b, straight slope is k, and fitting a straight line formula is as follows：
In formula, xiFor ith sample point, yiFor the respective value of straight line ith sample point after fitting, m is sampled point number；
(3) by emulation experiment, the threshold values of slope k is determinedLightning stroke flashover is carried out by following condition with non-flashover to differentiate：
IfThen it is determined as lightning stroke flashover；
IfThen it is determined as the non-flashover of thunderbolt.
In the present invention, slope k and threshold values of the zero-sequence current waveform after fitting a straight lineSetting, be all by a large amount of
System simulation experiments, finally find out appropriate numerical value, be used as the foundation compared.
After transmission line of electricity is by being struck by lightning, measured from bus measuring point by the zero-sequence current of thunderbolt circuit；Extract after thunderbolt
Power transmission line zero-sequence electric current time domain waveform in 7ms, fitting a straight line is carried out to it, and determine the straight line y after fittingi=kxi+ b, is obtained
Go out slope of curve k；By comparing the absolute value of slope k and the size of pre-set threshold value, carry out lightning stroke flashover and differentiate with non-flashover.
Embodiment 1：220kV transmission line of electricity simulation models as shown in Figure 2.Assuming that being led away from thunderbolt occurs at A points 90km
Line, lightning current peak value 15kA, thunderbolt does not cause flashover, and fault angle is 45 °, and sample frequency is 1MHz.
The method of discrimination flow chart of transmission line lightning stroke flashover and non-flashover is as shown in Figure 1.From bus measuring point measure by
The zero-sequence current of thunderbolt circuit, extracts electric current time domain waveform after thunderbolt 7ms, and is carried out fitting a straight line, as a result such as Fig. 3 institutes
Show.Drawn according to formula (1) and (2)：
K=-2.5396e-05
B=0.10252
Curvilinear equation after fitting is：
Y=-2.5396e-05x+0.10252
Then slope k absolute value is：
| k |=2.5396 × 10-5=0.25396 × 10-4
By a large amount of emulation experiments, the threshold values of zero-sequence current waveform slope k absolute value after fitting a straight line is setBecauseIt is determined that the non-flashover of thunderbolt, with assuming consistent, lightning stroke flashover and non-flashover
Differentiate correct.
Embodiment 2：220kV transmission line of electricity simulation models as shown in Figure 2.Assuming that lightning strike spot is away from A point 90km, lightning current peak value
25kA, thunderbolt causes flashover, and fault angle is 0 °, and sample frequency is 1MHz.
The method of discrimination flow chart of transmission line lightning stroke flashover and non-flashover is as shown in Figure 1.From bus measuring point measure by
The zero-sequence current of thunderbolt circuit, extracts electric current time domain waveform after thunderbolt 7ms, and is carried out fitting a straight line, as a result such as Fig. 4 institutes
Show.Drawn according to formula (1) and (2)：
K=0.00033576
B=-0.63475
Curvilinear equation after fitting is：
Y=0.00033576x-0.63475
Then slope k absolute value is：
| k |=3.3576 × 10-4
By a large amount of emulation experiments, the threshold values of zero-sequence current waveform slope k absolute value after fitting a straight line is setBecauseIt is determined that lightning stroke flashover, with assuming consistent, lightning stroke flashover is sentenced with non-flashover
It is incorrect.
Above in association with accompanying drawing to the present invention embodiment be explained in detail, but the present invention be not limited to it is above-mentioned
Embodiment, can also be before present inventive concept not be departed from the knowledge that those of ordinary skill in the art possess
Put that various changes can be made.
Claims (2)
1. a kind of method for differentiating transmission line lightning stroke flashover and non-flashover, it is characterised in that：When transmission line of electricity is struck by lightning,
The zero-sequence current of circuit is obtained from bus measuring point；Zero-sequence current after thunderbolt occurs in 7ms carries out fitting a straight line, by straight line
The absolute value of zero-sequence current waveform slope after fitting is as criterion, by comparing zero-sequence current waveform slope absolute value and setting
Magnitude relationship between threshold values, realizes the differentiation of transmission line lightning stroke flashover and non-flashover.
2. the method according to claim 1 for differentiating transmission line lightning stroke flashover and non-flashover, it is characterised in that described to sentence
Other method is concretely comprised the following steps：
(1) when transmission line of electricity is struck by lightning, the zero-sequence current of circuit is obtained from line end measuring point；
(2) zero-sequence current after thunderbolt occurring in 7ms carries out fitting a straight line, is drawn according to fitting a straight line formula straight after fitting
Line equation is yi=kxi+ b, straight slope is k, and fitting a straight line formula is as follows：
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In formula, xiFor ith sample point, yiFor the respective value of straight line ith sample point after fitting, m is sampled point number；
(3) by emulation experiment, the threshold values of slope k is determinedLightning stroke flashover is carried out by following condition with non-flashover to differentiate：
IfThen it is determined as lightning stroke flashover；
IfThen it is determined as the non-flashover of thunderbolt.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107767366A (en) * | 2017-09-22 | 2018-03-06 | 全球能源互联网研究院有限公司 | A kind of transmission line of electricity approximating method and device |
| CN109471003A (en) * | 2018-09-30 | 2019-03-15 | 昆明理工大学 | One kind dodges to fall and do not dodge based on the lightning stroke of 110kV same tower double back transmission line falls discrimination method |
| CN110068747A (en) * | 2019-04-22 | 2019-07-30 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | A kind of transmission line lightning stroke flashover method of discrimination based on OPGW |
| CN110426607A (en) * | 2019-06-03 | 2019-11-08 | 江苏德大石化科技有限公司 | The monitoring system of arc flash occurs for a kind of identification lightning current |
| CN115656732A (en) * | 2022-12-12 | 2023-01-31 | 昆明理工大学 | Method and system for identifying lightning stroke fault based on lightning impulse rate |
| CN115792507A (en) * | 2023-02-09 | 2023-03-14 | 昆明理工大学 | Multiple lightning stroke discrimination method and system based on short time window slope monotonicity |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107767366A (en) * | 2017-09-22 | 2018-03-06 | 全球能源互联网研究院有限公司 | A kind of transmission line of electricity approximating method and device |
| CN109471003A (en) * | 2018-09-30 | 2019-03-15 | 昆明理工大学 | One kind dodges to fall and do not dodge based on the lightning stroke of 110kV same tower double back transmission line falls discrimination method |
| CN110068747A (en) * | 2019-04-22 | 2019-07-30 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | A kind of transmission line lightning stroke flashover method of discrimination based on OPGW |
| CN110426607A (en) * | 2019-06-03 | 2019-11-08 | 江苏德大石化科技有限公司 | The monitoring system of arc flash occurs for a kind of identification lightning current |
| CN115656732A (en) * | 2022-12-12 | 2023-01-31 | 昆明理工大学 | Method and system for identifying lightning stroke fault based on lightning impulse rate |
| CN115792507A (en) * | 2023-02-09 | 2023-03-14 | 昆明理工大学 | Multiple lightning stroke discrimination method and system based on short time window slope monotonicity |
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