CN111650476B - Sampling value method-based single-phase arc ground fault line selection method for power distribution network - Google Patents

Sampling value method-based single-phase arc ground fault line selection method for power distribution network Download PDF

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CN111650476B
CN111650476B CN202010638283.8A CN202010638283A CN111650476B CN 111650476 B CN111650476 B CN 111650476B CN 202010638283 A CN202010638283 A CN 202010638283A CN 111650476 B CN111650476 B CN 111650476B
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feeder line
amplitude
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feeder
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CN111650476A (en
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陈士军
崔程尧
陈星宇
陈奎
腾松
宋强
吴波
方涛
杨波
邓天
王艳
王子意
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State Grid Xuzhou Power Supply Co
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Pei County Power Supply Branch Jiangsu Province Electric Power Co ltd Of State Grid
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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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • 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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • 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
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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
    • G01R31/58—Testing of lines, cables or conductors
    • 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

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Abstract

The invention discloses a sampling value method-based single-phase arc ground fault line selection method for a power distribution network, which is characterized in that when a single-phase ground fault occurs, the sum of first 1/4 cycles of zero-sequence current sampling values of all feeder lines is used as an amplitude initial criterion of the feeder lines, normalization processing is carried out, and then the amplitude criterion is calculated; and calculating the product of the amplitude initial criteria of each feeder line and other feeder lines, wherein when the product is smaller than a threshold value, the phase criterion is increased by 1, otherwise, the phase criterion is unchanged. And when the amplitude criterion is consistent with the fault feeder line judged by the phase criterion, the feeder line is the fault feeder line. And when the two feeder lines are inconsistent, calculating the credibility of the amplitude criterion and the phase criterion by taking the secondary maximum value as a reference, and solving a comprehensive criterion, wherein the feeder line corresponding to the maximum value of the comprehensive criterion is a fault feeder line. The method does not need to calculate the frequency, the magnitude and the direction of the zero sequence transient current, is simple to calculate and easy to realize and popularize, and can effectively improve the accuracy of electric arc grounding line selection of the power distribution network.

Description

Sampling value method-based single-phase arc ground fault line selection method for power distribution network
Technical Field
The invention belongs to the technical field of power system automation, and particularly relates to a sampling value method-based single-phase arc grounding fault line selection method for a power distribution network.
Background
The single-phase earth fault line selection of the power distribution network is always a difficulty of relay protection. When a single-phase earth fault occurs in the power distribution network, the fault characteristics are complex, the fault types are many, and the fault components are relatively very small, so that the accuracy of earth fault line selection is seriously influenced. For this reason, a large number of power workers have proposed some line selection methods implemented by using the zero sequence component characteristic after the ground fault. The line selection methods mainly comprise: a line selection method based on zero sequence current magnitude is formed by utilizing the characteristics of the zero sequence component after the ground fault; a line selection method based on zero sequence energy analysis; a line selection method based on wavelet analysis; a line selection method based on the characteristics of the injected signals, and the like. However, the method has the limitations of large calculation amount, high requirement on the precision of detection equipment and the like, so that the research on the single-phase arc ground fault line selection method of the power distribution network based on the sampling value method, which is simple in calculation and easy to realize and popularize, is developed, and the method has an important research value for improving the safety and reliability of the operation of the power distribution network.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention aims to provide a power distribution network single-phase arc ground fault line selection method based on a sampling value method, so as to overcome the defect of the traditional power distribution network single-phase arc ground fault line selection and realize the accurate line selection of the power distribution network single-phase arc ground fault.
The invention provides a sampling value method-based single-phase arc ground fault line selection method for a power distribution network, which comprises the following steps of:
(1) numbering the feeder lines according to the structure of the power distribution network and the number of the feeder lines, and determining the value of the number M of the feeder lines;
(2) judging whether a single-phase earth fault occurs or not by detecting the magnitude of the zero sequence voltage of the power distribution network, and if the single-phase earth fault occurs, carrying out the next step;
(3) calculating the amplitude initial criterion I of each feeder line according to the formula (1) by using the first 1/4 cycle sampling value of the zero sequence current of each feeder line0·iAs shown in formula (1):
Figure BDA0002570247640000011
wherein i0·i(k) Sampling point values of the kth zero-sequence current of the ith feeder line; n is the number of first 1/4 cycle sampling points, I0·iThe initial criterion I of the amplitude of each feeder line is used as the initial criterion of the amplitude of the ith feeder line, and the initial criterion I of the amplitude of each feeder line is used for simplifying calculation and facilitating comparison0·iNormalization was performed using feeder L1 as a standard, and the result was designated as I'0·i。
(4) Amplitude initial criterion I 'normalized by all feeder lines'0·iCalculating amplitude criterion I of each feeder line "0·iAs shown in equation (2);
Figure BDA0002570247640000021
(5) solving the product value of the initial criterion of the amplitude values among all the feeder lines according to the formula (3);
P0·i·j＝I'0·i×I'0·j (3)
wherein, P0·i·jIs the product of the ith feeder line and the jth feeder line amplitude initial criterion;
(6) calculating the phase criterion of each feeder line according to a formula (4) and a formula (5) by using the product value of the initial criterion of the amplitude values among all the feeder lines;
Figure BDA0002570247640000022
Figure BDA0002570247640000023
wherein, PzdIs a threshold value, and takes the value of 0; p'0·i·jThe judgment value is compared with other feeder lines; p0·iAnd (4) determining the final phase of the ith feeder line.
(7) And solving the credibility and the comprehensive weight based on the amplitude criterion and the phase criterion: respectively finding out maximum value I of amplitude criterion0max1And a sub-maximum value I0max2Maximum value P of phase criterion0max1And a sub-maximum P0max2(ii) a Determining the weight W of the amplitude criterion according to equation (6)IWeight W of sum phase criterionP；
Figure BDA0002570247640000031
Wherein, WIAs amplitude criterion weight, WPThe phase is used as a criterion weight;
(8) selecting a fault feeder line by using a maximum amplitude criterion method, a maximum phase criterion method and a maximum comprehensive criterion method: when the feeder line corresponding to the maximum amplitude criterion and the feeder line corresponding to the maximum phase criterion are the same feeder line, the feeder line is a fault feeder line; and when the feeder lines are inconsistent, calculating the comprehensive criterion of each feeder line through the formula (7), wherein the feeder line corresponding to the maximum comprehensive criterion is a fault feeder line.
fi＝I”0·i×WI+P0·i×WP (7)
Wherein f isiAnd the comprehensive criterion corresponding to the ith feeder line.
Adopt the beneficial effect that above-mentioned technical scheme brought: the invention relates to a novel method for realizing fault line selection by directly utilizing the value of a zero-sequence current sampling point of a single-phase arc ground fault of a power distribution network, which can effectively solve the problems of uncertain frequency of the transient component of the zero-sequence current of the single-phase arc ground fault of the power distribution network and complex amplitude and phase calculation, can effectively improve the accuracy of the single-phase arc ground fault line selection of the power distribution network, and has the characteristics of simple calculation, easy realization and popularization.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a power distribution network;
FIG. 3 is a schematic diagram of an A-phase arc ground fault on L2;
fig. 4 is a waveform diagram of the zero sequence current of each feeder line when an a-phase ground fault occurs on L2.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a sampling value method-based arc grounding fault line selection method for a power distribution network, which comprises the following steps as shown in figure 1:
(1) numbering the feeder lines according to the structure of the power distribution network and the number of the feeder lines, and determining the value of the number M of the feeder lines;
(2) judging whether a single-phase earth fault occurs or not by detecting the magnitude of the zero sequence voltage of the power distribution network, and if the single-phase earth fault occurs, carrying out the next step; i.e. when U is present0>U0zdAnd judging that the single-phase earth fault occurs. Wherein U is0The zero sequence voltage effective value monitored in the transformer substation is obtained; u shape0zdSetting a zero sequence voltage value;
(3) calculating the amplitude initial criterion I of each feeder line according to the formula (1) by using the first 1/4 cycle sampling value of the zero sequence current of each feeder line0·iAs shown in formula (1):
Figure BDA0002570247640000041
wherein i0·i(k) Sampling point values of the kth zero-sequence current of the ith feeder line; n is the number of first 1/4 cycle sampling points, I0·iIs the initial criterion of the amplitude value of the ith feeder line, is used for simplifying calculation and facilitating comparison,the amplitude of each feeder line is initially determined as I0·iNormalization was performed using feeder L1 as a standard, and the result was designated as I'0·i。
(4) Amplitude initial criterion I 'normalized by all feeder lines'0·iCalculating amplitude criterion I of each feeder line "0·iAs shown in equation (2);
Figure BDA0002570247640000042
(5) solving the product value of the initial criterion of the amplitude values among all the feeder lines according to the formula (3);
P0·i·j＝I'0·i×I'0·j (3)
wherein, P0·i·jIs the product of the ith feeder line and the jth feeder line amplitude initial criterion;
(6) calculating the phase criterion of each feeder line according to a formula (4) and a formula (5) by using the product value of the initial criterion of the amplitude values among all the feeder lines;
Figure BDA0002570247640000043
Figure BDA0002570247640000044
wherein, PzdIs a threshold value, and takes the value of 0; p'0·i·jIs a decision value, P, of the line i compared with other feeders0·iAnd (4) determining the final phase of the ith feeder line.
(7) And solving the credibility and the comprehensive weight based on the amplitude criterion and the phase criterion: respectively finding out maximum value I of amplitude criterion0max1And a sub-maximum value I0max2Maximum value P of phase criterion0max1And a sub-maximum P0max2(ii) a Determining the weight W of the amplitude criterion according to equation (6)IWeight W of sum phase criterionP；
Figure BDA0002570247640000051
Wherein, WIAs amplitude criterion weight, WPWeight is a phase criterion;
(8) selecting a fault feeder line by using a maximum amplitude criterion method, a maximum phase criterion method and a maximum comprehensive criterion method: when the feeder line corresponding to the maximum amplitude criterion and the feeder line corresponding to the maximum phase criterion are the same feeder line, the feeder line is a fault feeder line; when the feeder lines are inconsistent, calculating the comprehensive criterion of each feeder line through the formula (7), wherein the feeder line corresponding to the largest comprehensive criterion is a fault feeder line;
fi＝I”0·i×WI+P0·i×WP (7)
wherein f isiAnd the comprehensive criterion corresponding to the ith feeder line.
The invention is illustrated by the following examples.
In the distribution network shown in fig. 2, it is assumed that the setting value of the zero sequence voltage is 10% of the rated phase voltage, and when the zero sequence voltage is greater than the setting value, a single-phase ground fault is considered to occur.
According to fig. 2, the lines L1-L4 define feeder lines.
(1) A phase a arc ground fault occurs on the feed line L2, as shown in fig. 3, when: u shape0>U0dzAnd starting to select a fault line, wherein the zero sequence current waveform of each feeder line when a fault occurs is shown in fig. 4.
According to the values of the zero sequence current sampling points detected by each feeder line, the amplitude initial criterion and the amplitude criterion of the feeder lines L1-L4 are calculated and are shown in the table 1:
TABLE 1
Figure BDA0002570247640000052
The phase criteria for calculating the feeds L1-L4 are shown in Table 2:
TABLE 2
L1 L2 L3 L4
Phase criterion 1 3 1 1
The weights of the magnitude and phase criteria are shown in table 3:
TABLE 3
Amplitude criterion Phase criterion
Weight of 0.382 0.618
The comprehensive criterion for calculating the feeders L1-L4 is shown in Table 4:
TABLE 4
L1 L2 L3 L4
Comprehensive criterion 2.23 4.84 1.98 1.98
According to the above criteria, the comprehensive criterion of the fault line L2 is obviously larger than that of other non-fault lines, and the method can accurately select the fault line.
The embodiments are only for illustrating the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the scope of the present invention.

Claims (2)

1. A power distribution network single-phase arc grounding fault line selection method based on a sampling value method is characterized by comprising the following steps:
(1) numbering the feeder lines according to the structure of the power distribution network and the number of the feeder lines, and determining the value of the number M of the feeder lines;
(2) judging whether a single-phase earth fault occurs or not by detecting the magnitude of the zero sequence voltage of the power distribution network, and if the single-phase earth fault occurs, carrying out the next step;
(3) calculating the amplitude initial criterion I of each feeder line according to the formula (1) by using the first 1/4 cycle sampling value of the zero sequence current of each feeder line0·iAs shown in formula (1);
Figure FDA0003563455950000011
wherein i0·i(k) Sampling point values of the kth zero-sequence current of the ith feeder line; n is the number of first 1/4 cycle sampling points, I0·iThe initial criterion I of the amplitude of each feeder line is used as the initial criterion of the amplitude of the ith feeder line, and the initial criterion I of the amplitude of each feeder line is used for simplifying calculation and facilitating comparison0·iNormalization was performed using feeder L1 as a standard, and the result was designated as I'0·i；
(4) Amplitude initial criterion I 'normalized by all feeder lines'0·iCalculating amplitude criterion I of each feeder line "0·iAs shown in equation (2);
Figure FDA0003563455950000012
(5) solving the product value of the initial criterion of the amplitude values among all the feeder lines according to the formula (3);
P0·i·j＝I'0·i×I'0·j (3)
wherein, P0·i·jIs the product of the ith feeder line and the jth feeder line amplitude initial criterion;
(6) calculating the phase criterion of each feeder line according to a formula (4) and a formula (5) by using the product value of the initial criterion of the amplitude values among all the feeder lines;
Figure FDA0003563455950000013
Figure FDA0003563455950000014
wherein, PzdIs a threshold value, and takes the value of 0; p'0·i·jIs a decision value, P, of the line i compared with other feeders0·iThe final phase criterion of the ith feeder line;
(7) and solving the credibility and the comprehensive weight based on the amplitude criterion and the phase criterion: respectively finding out maximum value I of amplitude criterion0max1And a sub-maximum value I0max2Maximum value P of phase criterion0max1And a sub-maximum P0max2(ii) a Determining the weight W of the amplitude criterion according to equation (6)IWeight W of sum phase criterionP；
Figure FDA0003563455950000021
Wherein, WIAs amplitude criterion weight, WPWeight is a phase criterion;
(8) selecting a fault feeder line by using a maximum amplitude criterion method, a maximum phase criterion method and a maximum comprehensive criterion method: when the feeder line corresponding to the maximum amplitude criterion and the feeder line corresponding to the maximum phase criterion are the same feeder line, the feeder line is a fault feeder line; when the feeder lines are inconsistent, calculating the comprehensive criterion of each feeder line through the formula (7), wherein the feeder line corresponding to the largest comprehensive criterion is a fault feeder line;
fi＝I”0·i×WI+P0·i×WP (7)
wherein f isiAnd the comprehensive criterion corresponding to the ith feeder line.
2. The sampling value method-based single-phase arc ground fault line selection method for the power distribution network according to claim 1, characterized in that: whether a single-phase earth fault occurs is judged by the method: when U is turned0＞U0zdJudging that a single-phase earth fault occurs; wherein U is0The zero sequence voltage effective value monitored in the transformer substation is obtained; u shape0zdAnd setting a zero sequence voltage value.
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