CN104953561A - Method for sample data exceptions of differential protection - Google Patents
Method for sample data exceptions of differential protection Download PDFInfo
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- CN104953561A CN104953561A CN201410112865.7A CN201410112865A CN104953561A CN 104953561 A CN104953561 A CN 104953561A CN 201410112865 A CN201410112865 A CN 201410112865A CN 104953561 A CN104953561 A CN 104953561A
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- differential protection
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- phase
- abnormality eliminating
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Abstract
The invention relates to a method for the sample data exceptions of differential protection. The method comprises the following steps: identifying the sample data exceptions by comparing the sudden changes of sampling values at the both sides of a circuit, simultaneously, judging the phases of data exception points and processing the phases respectively, when the phases of the sampling values are located in [0 degree, 45 degrees] or [135 degrees, 225 degrees] or [315 degrees, 360 degrees), setting the sampling values to 0, when the phases of the sampling values are located in (45 degrees, 135 degrees) or (225 degrees, 315 degrees), reducing the sampling values to 1/10 thereof, calculating a current differential protection criterion on this basis, and judging fault positions. The method for the sample data exceptions of the differential protection provided by the invention is capable of preventing the maloperations of the current differential protection, which are caused by the data exceptions.
Description
Technical field:
The present invention relates to a kind of data exception processing method, specifically relate to a kind of differential protection sampled data abnormality eliminating method.
Background technology:
Field of relay protection in power, because current differential protection does not affect by vibration, quick action, is widely used in transmission line main protection.Sampled data is the basis of protection; the performance of its quality and protection has close impact; but because data acquisition exists multiple link; data acquisition and transmission link generally may cause the distortion of sampled data; distortion data can affect the result of Fourier transform; cause phasor amplitude and phase place to change, and then current differential protection misoperation may be caused.
Existing current differential protection for distortion sampled value processing mode be by the several sampled point of alternative route the same side electric current between magnitude relationship; determine distortion data and it " is abandoned "; but when there is multiple continuous distortion data; all distortion datas cannot be rejected, time serious, current differential protection misoperation can be caused.The sampled data that the present invention is directed to Line Current Differential Protection employing processes, and reduces data exception to the impact of current differential protection.
Summary of the invention:
The object of this invention is to provide a kind of differential protection sampled data abnormality eliminating method; the method is abnormal by the sudden change identification sampled data of alternative route both sides sampled value; simultaneously by judging that the phase place of data exception point processes respectively to it, prevent abnormal data from causing current differential protection misoperation.
For achieving the above object, the present invention is by the following technical solutions: a kind of differential protection sampled data abnormality eliminating method, said method comprising the steps of:
(1) each phase current data I in transmission line both sides is gathered
miand I (K)
ni(K); I is A, B and C three-phase, and K is the time;
(2) data of process collection;
(3) current differential protection whether action is judged.
A kind of differential protection sampled data abnormality eliminating method provided by the invention, in described step (1), Current Transformer CT gathers described current data.
A kind of differential protection sampled data abnormality eliminating method provided by the invention, the data processing in described step (2) comprises:
Determine each phase current data I in described transmission line side
mi(K) each phase current data I of one-period is differed with it
mi(K-T) difference, i.e. I
mi(K)-I
mi(K-T);
Determine each phase current data I of described transmission line opposite side
ni(K) each phase current data I of one-period is differed with it
ni(K-T) difference, i.e. I
ni(K)-I
ni(K-T);
By described I
mi(K)-I
miand I (K-T)
ni(K)-I
ni(K-T) respectively to Sudden Changing Rate definite value Δ I
setcompare.
Another preferred a kind of differential protection sampled data abnormality eliminating method provided by the invention, as described I
mi(K)-I
mi(K-T) > Δ I
setand I
ni(K)-I
ni(K-T) > Δ I
settime, respectively to described I
miand I (K)
ni(K) Fourier transform is carried out and condenser current compensation obtains
with
determine
with
and with difference modulus value
with
As described I
mi(K)-I
mi(K-T) > Δ I
setand I
ni(K)-I
ni(K-T) < Δ I
settime, determine described I
mi(K) phase angle theta.
A preferred a kind of differential protection sampled data abnormality eliminating method more provided by the invention, as described 0 °≤θ≤45 ° or 135 °≤θ≤225 ° or 315 °≤θ < 360 °, by described I
mi(K) to set to 0 and respectively to I
miand I (K)
ni(K) Fourier transform is carried out and condenser current compensation obtains
with
determine
with
and with difference modulus value
with
Another preferred a kind of differential protection sampled data abnormality eliminating method provided by the invention; as described 45 ° of < θ < 135 °, 225 ° < θ < 315 °, by described I
mi(K) 0.1I is set to
mi(K) and respectively to I
miand I (K)
ni(K) Fourier transform is carried out and condenser current compensation obtains
with
determine
with
and with difference modulus value
with
Another preferred a kind of differential protection sampled data abnormality eliminating method provided by the invention, when
be judged as troubles inside the sample space, current differential protection action;
When
be judged as external area error, current differential protection is failure to actuate;
Wherein, k is restraint coefficient.
Another preferred a kind of differential protection sampled data abnormality eliminating method provided by the invention, described I
mi(K)-I
mi(K-T) by each phase zero-sequence current data I of described circuit side
m0(K) I of each phase current data of one-period is differed with it
m0(K-T) difference, i.e. I
m0(K)-I
m0(K-T) with alternative;
Described I
n0(K)-I
n0(K-T) by each phase zero-sequence current data I of described circuit opposite side
ni(K) each phase current data I of one-period is differed with it
ni(K-T) difference, namely with I
ni(K)-I
ni(K-T) substitute; Judge to realize current differential protection action.
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
1, the present invention is abnormal by the sudden change identification sampled data of alternative route both sides sampled value, simultaneously by judging that the phase place of data exception point processes respectively to it, reduces data exception to the impact of current differential protection;
2, the present invention prevents abnormal data from causing current differential protection misoperation;
3, the inventive method is that the protection of transmission line is had laid a good foundation;
4, the inventive method is simple not easily occurs that mistake, reliability are high.
Accompanying drawing explanation
Fig. 1 is the inventive method flow chart.
Embodiment
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in Figure 1, the method step of the invention of this example is as follows:
(1) each phase current data I in circuit both sides is gathered
miand I (K)
ni(K), (i=A, B, C three-phase), K is the time;
(2) each phase current data I in described transmission line side is calculated
mi(K) each phase current data I of one-period is differed with it
mi(K-T) difference, i.e. I
mi(K)-I
mi(K-T);
Determine each phase current data I of described transmission line opposite side
ni(K) each phase current data I of one-period is differed with it
ni(K-T) difference, i.e. I
ni(K)-I
ni(K-T);
(3) I is worked as
mi(K)-I
mi(K-T) > Δ I
set, and I
ni(K)-I
ni(K-T) > Δ I
settime, go to step (7), wherein Sudden Changing Rate definite value Δ I
set;
(4) I is worked as
mi(K)-I
mi(K-T) > Δ I
set, and I
ni(K)-I
ni(K-T) < Δ I
settime, calculate I
mi(K) phase angle;
(5) if or or time, by I
mi(K) set to 0, go to step (7);
(6) I is worked as
mi(K)-I
mi(K-T) > Δ I
set, and I
ni(K)-I
ni(K-T) < Δ I
settime, if, time, by I
mi(K) be set to, go to step (7);
(7) to I
miand I (K)
ni(K) carry out Fourier transform, carry out condenser current compensation and obtain
with
calculate
with
and with difference modulus value
with
(8) if
be judged as troubles inside the sample space, current differential protection action, if
be judged as external area error, current differential protection is failure to actuate, and wherein k is restraint coefficient.
By CT(current transformer in described step (1)) described current data is gathered.
The present invention also can be used for zero-sequence current and realizes current differential protection action judgement, described I
mi(K)-I
mi(K-T) by each phase zero-sequence current data I of described circuit side
m0(K) I of each phase current data of one-period is differed with it
m0(K-T) difference, i.e. I
m0(K)-I
m0(K-T) with alternative;
Described I
n0(K)-I
n0(K-T) by each phase zero-sequence current data I of described circuit opposite side
ni(K) each phase current data I of one-period is differed with it
ni(K-T) difference, namely with I
ni(K)-I
ni(K-T) substitute.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of this right.
Claims (8)
1. a differential protection sampled data abnormality eliminating method, is characterized in that: said method comprising the steps of:
(1) gather transmission line both sides each phase current data and; I is A, B and C three-phase, and K is the time;
(2) data of process collection;
(3) current differential protection whether action is judged.
2. a kind of differential protection sampled data abnormality eliminating method as claimed in claim 1, is characterized in that: in described step (1), Current Transformer CT gathers described current data.
3. a kind of differential protection sampled data abnormality eliminating method as claimed in claim 1, is characterized in that: the data processing in described step (2) comprises:
Determine each phase current data I in described transmission line side
mi(K) difference of each phase current data of one-period is differed with it, i.e. I
mi(K)-I
mi(K-T);
Determine each phase current data I of described transmission line opposite side
ni(K) difference of each phase current data of one-period is differed with it, i.e. I
ni(K)-I
ni(K-T);
By described I
mi(K)-I
miand I (K-T)
ni(K)-I
ni(K-T) respectively to Sudden Changing Rate definite value Δ I
setcompare.
4. a kind of differential protection sampled data abnormality eliminating method as claimed in claim 3, is characterized in that: as described I
mi(K)-I
mi(K-T) > Δ I
setand I
ni(K)-I
ni(K-T) > Δ I
settime, respectively to described I
miand I (K)
ni(K) Fourier transform is carried out and condenser current compensation obtains
with
described in determining
with
and with difference modulus value
with
As described I
mi(K)-I
mi(K-T) > Δ I
setand I
ni(K)-I
ni(K-T) < Δ I
settime, determine described I
mi(K) phase angle theta.
5. a kind of differential protection sampled data abnormality eliminating method as claimed in claim 4, is characterized in that: as described 0 °≤θ≤45 ° or 135 °≤θ≤225 ° or 315 °≤θ < 360 °, by described I
mi(K) to set to 0 and respectively to I
miand I (K)
ni(K) Fourier transform is carried out and condenser current compensation obtains
with
described in determining
with
and with difference modulus value
with
6. a kind of differential protection sampled data abnormality eliminating method as claimed in claim 4; it is characterized in that: as described 45 ° of < θ < 135 °, 225 ° < θ < 315 °, by described I
mi(K) 0.1I is set to
mi(K) and respectively to I
miand I (K)
ni(K) Fourier transform is carried out and condenser current compensation obtains
with
described in determining
with
and with difference modulus value
with
7. a kind of differential protection sampled data abnormality eliminating method as described in claim 4-6 any one, is characterized in that: when
be judged as troubles inside the sample space, current differential protection action;
When
be judged as external area error, current differential protection is failure to actuate;
Wherein, k is restraint coefficient.
8. a kind of differential protection sampled data abnormality eliminating method as claimed in claim 3, is characterized in that: described I
mi(K)-I
mi(K-T) by each phase zero-sequence current data I of described circuit side
m0(K) I of each phase current data of one-period is differed with it
m0(K-T) difference, i.e. I
m0(K)-I
m0(K-T) with alternative;
Described I
n0(K)-I
n0(K-T) by each phase zero-sequence current data I of described circuit opposite side
ni(K) each phase current data I of one-period is differed with it
ni(K-T) difference, namely with I
ni(K)-I
ni(K-T) substitute; Judge to realize current differential protection action.
Priority Applications (1)
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| CN201410112865.7A CN104953561B (en) | 2014-03-24 | 2014-03-24 | A kind of differential protection sampled data abnormality eliminating method |
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|---|---|---|---|
| CN201410112865.7A CN104953561B (en) | 2014-03-24 | 2014-03-24 | A kind of differential protection sampled data abnormality eliminating method |
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| CN104953561A true CN104953561A (en) | 2015-09-30 |
| CN104953561B CN104953561B (en) | 2018-01-19 |
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Cited By (3)
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| CN105811380A (en) * | 2016-02-03 | 2016-07-27 | 中国电力科学研究院 | Rapid current differential protection method based on recursive Fourier algorithm |
| CN109270427A (en) * | 2018-08-15 | 2019-01-25 | 南京国电南自电网自动化有限公司 | A kind of identification of sampling bad point and bearing calibration based on phase bit comparison |
| CN114094536A (en) * | 2021-10-19 | 2022-02-25 | 南京国电南自电网自动化有限公司 | Relay protection sampling anti-error system and method based on intelligent identification |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811380A (en) * | 2016-02-03 | 2016-07-27 | 中国电力科学研究院 | Rapid current differential protection method based on recursive Fourier algorithm |
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| CN109270427A (en) * | 2018-08-15 | 2019-01-25 | 南京国电南自电网自动化有限公司 | A kind of identification of sampling bad point and bearing calibration based on phase bit comparison |
| CN109270427B (en) * | 2018-08-15 | 2020-11-06 | 南京国电南自电网自动化有限公司 | Sampling dead pixel identification and correction method based on phase comparison |
| CN114094536A (en) * | 2021-10-19 | 2022-02-25 | 南京国电南自电网自动化有限公司 | Relay protection sampling anti-error system and method based on intelligent identification |
| CN114094536B (en) * | 2021-10-19 | 2024-05-28 | 南京国电南自电网自动化有限公司 | Relay protection sampling error-preventing system and method based on intelligent recognition |
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