CN108287286B - Polarity verification method based on single-phase earth fault recording data - Google Patents
Polarity verification method based on single-phase earth fault recording data Download PDFInfo
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- CN108287286B CN108287286B CN201810040097.7A CN201810040097A CN108287286B CN 108287286 B CN108287286 B CN 108287286B CN 201810040097 A CN201810040097 A CN 201810040097A CN 108287286 B CN108287286 B CN 108287286B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to a polarity checking method based on single-phase earth fault recording data, which comprises the steps of calculating and sequencing the amplitude values of zero sequence current of each line by taking the fault recording data, calculating the polarity coefficient between the circuit and other lines by taking one of the lines with non-maximum and non-minimum zero sequence current amplitude values and consistent polarity of zero sequence reactive power transient component and zero sequence reactive power frequency component as a reference, calculating all polarity coefficients related to the kth line after the first n faults and judging whether the polarity is correct or not. The invention can effectively utilize fault recording data to verify the polarity of the zero-sequence current signal, does not need to verify a mutual inductor and a secondary circuit for the power failure of a switch cabinet, and is self-adaptive to a system with a neutral point not grounded and a system with a grounded arc suppression coil.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a polarity verification method based on single-phase earth fault recording data.
Background
The principle of small current ground fault line selection is numerous, and the basic method is to analyze and compare the zero sequence current amplitude ratio of the monitored line or the relation between the zero sequence current amplitude ratio and the bus zero sequence voltage to judge the fault line. The basic principle of the steady state method is that the amplitude and the polarity of the steady state zero sequence current are analyzed for judgment; the basic principle of the transient method is to judge through the amplitude polarity of the zero sequence current in the characteristic frequency band or the correlation between the zero sequence current and the zero sequence voltage. Other methods such as an injection method or a resistance in neutral point switching are all judged through the variable quantity or the threshold value of the zero sequence current of the monitored line. No matter which method or principle is used, whether the polarities of the access signals are uniform or not is a key factor influencing the correct line selection of the low-current ground fault. However, in many situations, the polarity and the wiring of the zero-sequence current transformer cannot be uniformly checked when the switch cabinet is powered off, so that signals accessed by a plurality of devices cannot be unified, and the accuracy of line selection is affected.
Disclosure of Invention
The invention provides a polarity checking method based on a single-phase earth fault judgment result, solves the problem that the uniformity of the signal access polarity of a zero sequence current transformer cannot be checked when a switch cabinet is powered off, and is adaptive to a system with a neutral point not grounded and a system with a grounded arc suppression coil.
The technical scheme adopted by the invention is as follows: a polarity verification method based on single-phase earth fault recording data comprises the following steps:
step one, supposing that m lines are shared by the monitored buses, and m is more than or equal to 3, obtaining fault recording data after each single-phase earth fault occurs, calculating the amplitude of zero-sequence current of each line and sequencing;
step two, taking fault recording data of one line with non-maximum and non-minimum zero-sequence current amplitude, calculating a zero-sequence reactive power transient component and a zero-sequence reactive power frequency component, if both lines flow to the line through a bus, the polarity of the line is correct, if both lines flow to the bus, the polarity of the line is judged to be wrong, if the two are opposite, abandoning the line for judgment, taking fault recording data of the next line with non-maximum and non-minimum zero-sequence current amplitude, repeating the calculation and judgment, and if the polarities of the zero-sequence reactive power transient component and the zero-sequence reactive power frequency component of all lines with non-maximum and non-minimum zero-sequence current amplitude are opposite, abandoning the judgment;
taking one line with non-maximum and non-minimum zero-sequence current amplitude and consistent zero-sequence reactive power transient component and zero-sequence reactive power frequency component polarity as a reference, calculating a polarity coefficient between zero-sequence current fault recording data of the reference line and m-1 other lines and storing the polarity coefficient in a one-dimensional array F i In which F is i Representing a one-dimensional array formed by polarity coefficients of all lines after the ith fault;
step four, all the polarity coefficients related to the kth line in all the one-dimensional arrays after the previous n times of faults are taken out, if so, all the polarity coefficients are taken out
Then the k line is positive in polarityDetermining; if it is
If yes, the polarity of the kth line is wrong; if it is
If yes, the polarity of the kth line is abnormal; if the polarity is not correct under other conditions, the judgment is abandoned.
The invention can be further embodied as follows:
in the first step, the value of all sampling points in a time window set in a frequency band of 150-3 KHz is calculated and accumulated.
The invention can be further embodied as follows:
one-dimensional array F in step III i =[f 1 ,f 2 ,…，f j ，…，f m ]M is not less than 3 and m is more than j and more than 1, wherein F i （j）=f j When the reference line is the jth line, f j =0; if the polarity of the reference line is correct and the polarity coefficient is greater than 0, the result is recorded as f j =1, if the polarity of the reference line is correct and the polarity coefficient is less than 0, f j = -1; if the polarity of the reference line is wrong and the polarity coefficient is greater than 0, the result is recorded as f j = -1, if the polarity of the reference line is wrong and the polarity coefficient is less than 0 j =1; if the zero sequence current amplitude of the jth line is maximum, the calculated f is calculated j The value of (c) is inverted.
The beneficial effects of the invention are: the polarity verification method based on the single-phase earth fault recording data has the advantages that: the polarity coefficient between the reference line and other lines can be effectively calculated according to fault recording data after the single-phase earth fault occurs, all the polarity coefficients related to the kth line after the previous n faults are calculated, and whether the polarity is correct or not is judged. The power failure of the switch cabinet is not needed to verify the mutual inductor and the secondary circuit, and the self-adaptive neutral point is not grounded and is grounded through the arc suppression coil.
Drawings
Fig. 1 is a logic flow chart of a polarity verification method based on single-phase earth fault recording data.
Detailed Description
In order to more clearly explain the advantages of the present invention, the following detailed description of the present invention is given with reference to the accompanying drawings. In the following description, numerous specific examples are set forth in order to provide a thorough understanding of the advantages of the invention, but the invention may be practiced otherwise than as specifically described and thus is not limited to the specific examples disclosed below.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a polarity verification method based on single-phase earth fault recording data comprises the following steps:
as shown in fig. 1, in the first step, assuming that m lines of the monitored buses are total, and m is greater than or equal to 3, obtaining fault recording data after each single-phase ground fault occurs, calculating and sequencing zero sequence current amplitude values of the lines; the calculated zero sequence current amplitude of each line is the accumulation of values of all sampling points in a set time window in a frequency range of 150-3 KHz.
And step two, obtaining fault recording data of one line with the non-maximum and non-minimum zero sequence current amplitude, calculating a zero sequence reactive power transient component and a zero sequence reactive power frequency component, if both the lines flow to the line, the polarity of the line is correct, if both the lines flow to the bus, the polarity of the line is judged to be wrong, if the two are opposite, the line is abandoned, obtaining fault recording data of the next line with the non-maximum and non-minimum zero sequence current amplitude, repeating the calculation and judgment, and if the polarities of the zero sequence reactive power transient component and the zero sequence reactive power frequency component of all the lines with the non-maximum and non-minimum zero sequence current amplitude are opposite, the judgment is abandoned.
Taking one line with non-maximum and non-minimum zero-sequence current amplitude and consistent zero-sequence reactive power transient component and zero-sequence reactive power frequency component polarity as a reference, calculating a polarity coefficient between zero-sequence current fault recording data of the reference line and m-1 other lines, and calculating the polarity coefficientStored in a one-dimensional array F i In which F is i And (4) representing a one-dimensional array formed by polarity coefficients of all lines after the ith fault. One-dimensional array F i =[f 1 ,f 2 ,…，f j ，…，f m ]M is not less than 3 and m is more than j and more than 1, wherein F i （j）=f j When the reference line is the jth line, f j =0; if the polarity of the reference line is correct and the polarity coefficient is greater than 0, the result is recorded as f j =1, if the reference line polarity is correct and the polarity factor is less than 0, f j = -1; if the polarity of the reference line is wrong and the polarity coefficient is greater than 0, the result is recorded as f j = -1, if the reference line polarity is wrong and the polarity coefficient is less than 0 j =1; if the zero sequence current amplitude of the jth line is maximum, the calculated f is calculated j The value of (c) is inverted.
Step four, taking out all polarity coefficients related to the kth line in all the one-dimensional arrays after the previous n times of faults, and if the polarity coefficients are not related to the kth line, judging whether the polarity coefficients are related to the kth line
Then, the polarity of the k line is correct; if it is
If yes, the polarity of the kth line is wrong; if it is
If yes, the polarity of the kth line is abnormal; if the polarity is not correct, the judgment is abandoned.
The above-described embodiments are merely preferred examples of the present invention and are not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent change, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A polarity verification method based on single-phase earth fault recording data is characterized by comprising the following steps:
step one, supposing that m lines are shared by the monitored buses, and m is more than or equal to 3, taking fault recording data after each single-phase earth fault, calculating and sequencing the amplitude of zero-sequence current of each line, wherein the amplitude of the zero-sequence current is the accumulation of values of all sampling points in a set time window in a frequency band of 150-3 kHz;
step two, taking fault recording data of one line with non-maximum and non-minimum zero-sequence current amplitude, calculating a zero-sequence reactive power transient component and a zero-sequence reactive power frequency component, judging the directions of the zero-sequence reactive power transient component and the power frequency component, if both the zero-sequence reactive power transient component and the power frequency component flow to the line, the polarity of the line is correct, if both the zero-sequence reactive power transient component and the power frequency component flow to the line, the polarity of the line is judged to be wrong, if the two are opposite, the line is abandoned, taking fault recording data of the next line with non-maximum and non-minimum zero-sequence current amplitude, repeating the calculation and judgment, and if the polarities of the zero-sequence reactive power transient component and the zero-sequence reactive power frequency component of all the lines with non-maximum and non-minimum zero-sequence current amplitude are opposite, the judgment is abandoned;
taking one line with non-maximum and non-minimum zero-sequence current amplitude and consistent zero-sequence reactive power transient component and zero-sequence reactive power frequency component polarity as a reference, calculating a polarity coefficient between zero-sequence current fault recording data of the reference line and m-1 other lines and storing the polarity coefficient in a one-dimensional array F i In which F is i One-dimensional array representing the polar coefficient composition of each line after ith fault, one-dimensional array F i ＝[f 1 ,f 2 ,…，f j ，…，f m ]M is not less than 3 and m is more than j and more than 1, wherein F i (j)＝f j Indicating the polarity coefficient between the jth line and the reference line at the ith fault, and f j =0; if the polarity of the reference line is correct and the polarity coefficient is greater than 0, the value is recorded as f j =1, if the polarity of the reference line is correct and the polarity coefficient is less than 0, f j = -1; if the polarity of the reference line is wrong and the polarity coefficient is greater than 0, the circuit is marked as f j = -1, if the polarity of the reference line is wrong and the polarity coefficient is less than0 then f j =1; if the zero sequence current amplitude of the jth line is maximum, the calculated f is calculated j The value of (a) is negated;
step four, all the polarity coefficients related to the kth line in all the one-dimensional arrays after the previous n times of faults are taken out, if so, all the polarity coefficients are taken out
Then, the polarity of the k line is correct; if it is
The polarity of the k line is wrong; if it is
The polarity of the kth line is abnormal; if the polarity is not correct under other conditions, the judgment is abandoned.
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| CN110554274B (en) * | 2019-09-03 | 2021-05-28 | 广东电网有限责任公司 | Adaptive weight grounding line selection method based on wavelet singular information |
| CN110927631B (en) * | 2019-12-03 | 2022-01-11 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN112249345B (en) * | 2020-10-15 | 2024-04-16 | 航宇救生装备有限公司 | Chair-mounted electronic umbrella opener state indicating device and method |
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