CN104049177B - One-phase earthing failure in electric distribution network localization method - Google Patents
One-phase earthing failure in electric distribution network localization method Download PDFInfo
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- CN104049177B CN104049177B CN201410244694.3A CN201410244694A CN104049177B CN 104049177 B CN104049177 B CN 104049177B CN 201410244694 A CN201410244694 A CN 201410244694A CN 104049177 B CN104049177 B CN 104049177B
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Abstract
A kind of one-phase earthing failure in electric distribution network localization method, relates to distribution network technology field, and solved is to reduce singlephase earth fault identification and the technical problem of location cost.The method is divided into multiple outlet section by equidistant for each outlet of power distribution network bus, then to each outlet section simulation singlephase earth fault one by one in the case of non-faulting, calculate each outlet section when simulating singlephase earth fault, bus bar side negative-sequence current fault simulation value in bus exit of the outlet belonging to it and bus bar side zero-sequence current fault simulation value；When power distribution network occurs singlephase earth fault, according to the analogue value in the case of non-faulting, all outlets of power distribution network bus are judged one by one, it is achieved identification and the location to singlephase earth fault.The method that the present invention provides, it is adaptable to the location of one-phase earthing failure in electric distribution network.
Description
Technical Field
The invention relates to a power distribution network technology, in particular to a technology of a power distribution network single-phase earth fault positioning method.
Background
Most of power distribution networks operate in a non-effective grounding mode, when a single-phase grounding fault occurs in the power distribution network, the short-circuit current is grounded through an arc suppression coil, the grounding current is very small, the power distribution network operates in a three-phase asymmetric mode in a normal operation mode, and negative-sequence current exists, so that the single-phase grounding fault of the power distribution network is difficult to identify, even if a fault area is identified, a special detection device is required to be additionally configured to assist identification and auxiliary positioning, and the cost of the power distribution network is increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for positioning the single-phase earth fault of the power distribution network, which can reduce the cost of identifying and positioning the single-phase earth fault and has accurate identification and rapid positioning.
In order to solve the technical problem, the invention provides a method for positioning a single-phase earth fault of a power distribution network, which is characterized by comprising the following steps:
dividing each outgoing line of a power distribution network bus, equally dividing each outgoing line into a plurality of outgoing line sections, setting the load current of each outgoing line section to be 0 under the non-fault condition, simulating single-phase earth faults of each outgoing line section one by one, and respectively calculating a bus side negative sequence current fault simulation value and a bus side zero sequence current fault simulation value of each outgoing line section;
the bus side negative sequence current fault analog value of the outgoing line section is as follows: when the outgoing line section simulates a single-phase earth fault, the bus side negative sequence current value of the outgoing line section at the bus outlet is obtained;
the bus side zero sequence current fault analog value of the outgoing line section is as follows: when the outgoing line section simulates a single-phase earth fault, the bus-side zero-sequence current value of the outgoing line section at the bus outlet is obtained;
when a fault occurs in the power distribution network, the single-phase earth fault is positioned through the following steps:
1) judging all outgoing lines of the distribution network bus one by one, if B [ I, j ] < fabs (I0[ I ])/beta exists and A [ I, j ] < fabs (I2[ I ])/beta exists, judging that an [ I, j ] outgoing line section of the distribution network bus is a single-phase ground fault suspicious section, and classifying the ith outgoing line of the distribution network bus into a suspicious outgoing line set;
wherein, the suspicious outgoing line set is an initial empty set, the [ I, j ] outgoing line section refers to the j-th outgoing line section of the ith outgoing line of the distribution network bus, B [ I, j ] is the bus side zero sequence current fault simulation value of the ith outgoing line of the distribution network bus when the [ I, j ] outgoing line section simulates a single-phase earth fault, I0[ I ] is the bus side zero sequence current real-time value of the ith outgoing line of the distribution network bus at the bus outlet, A [ I, j ] is the bus side negative sequence current fault simulation value of the ith outgoing line of the distribution network bus when the [ I, j ] outgoing line section simulates a single-phase earth fault, I2[ I ] is the bus side negative sequence current real-time value of the ith outgoing line of the distribution network bus at the bus outlet, beta is a load distribution factor, the value of beta is a constant, fabs is a function of taking absolute values of parameters, the signs of I0[ I ], I2[ I ] take the incoming bus as negative, the outflow bus is positive;
2) and calculating a zero sequence criterion factor and a negative sequence criterion factor, wherein the specific calculation formula is as follows:
wherein,is a zero sequence criterion factor, a negative sequence criterion factor, N is the total number of outgoing lines in the suspicious outgoing line set, M is the number of power supply transformers connected with the distribution network bus, I0T [ j]For the bus side zero sequence current real-time value of the jth outgoing line in the suspicious outgoing line set at the bus outlet, I2T [ j]Bus side negative sequence current real-time value for jth outlet in suspected outlet set, If0[ j]Bus-side zero-sequence current real-time values of the jth supply transformer connected to the distribution network bus, If2[ j]Real-time value of the negative-sequence current on the bus side of the jth supply transformer connected to the distribution network bus, I0T [ j]、I2T[j]、If0[j]、If2[j]The sign of (A) is negative by the inflow bus and positive by the outflow bus;
3) positioning the single-phase earth fault according to the zero sequence criterion factor and the negative sequence criterion factor;
if it is notOr the number is less than or equal to the Count, judging that the fault in the power distribution network is not a single-phase earth fault;
if it is notAnd is<Counting, namely judging that a single-phase grounding fault occurs on an outgoing line with the maximum bus side zero sequence current real-time value in the suspicious outgoing line set, wherein an outgoing line section to which a fault point belongs is the outgoing line section of the outgoing line, and the bus side zero sequence current fault analog value is closest to the outgoing line section of the current bus side zero sequence current real-time value of the outgoing line;
wherein, Count is a constant.
Further, the outgoing line section of a single outgoing line is divided into 2km in length.
Further, β is 0.85.
Further, the value of Count is 0.05.
The single-phase earth fault location method for the power distribution network provided by the invention utilizes the existing resources of the power distribution network, identifies and locates the single-phase earth fault of the power distribution network according to the bus side zero sequence current real-time value and the bus side negative sequence current real-time value at the bus outlet of the power distribution network, the bus side zero sequence and the negative sequence current of the power supply transformer, and combines the bus side negative sequence current fault simulation value and the bus side zero sequence current fault simulation value of each outgoing line section under the non-fault condition, so that the single-phase earth fault of the power distribution network can be accurately identified, the fault area can be rapidly located, the single-phase earth fault location method is easy to realize in engineering, no additional investment is required, and the single.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific embodiments, but the present invention is not limited to the specific embodiments, and all similar structures and similar variations thereof adopting the present invention should be included in the scope of the present invention.
The embodiment of the invention provides a method for positioning a single-phase earth fault of a power distribution network, which is characterized by comprising the following steps:
dividing each outgoing line of a power distribution network bus, equally dividing each outgoing line into a plurality of outgoing line sections, setting the load current of each outgoing line section to be 0 under the non-fault condition, simulating single-phase earth faults of each outgoing line section one by one, and respectively calculating a bus side negative sequence current fault simulation value and a bus side zero sequence current fault simulation value of each outgoing line section;
the bus side negative sequence current fault analog value of the outgoing line section is as follows: when the outgoing line section simulates a single-phase earth fault, the bus side negative sequence current value of the outgoing line section at the bus outlet is obtained;
the bus side zero sequence current fault analog value of the outgoing line section is as follows: when the outgoing line section simulates a single-phase earth fault, the bus-side zero-sequence current value of the outgoing line section at the bus outlet is obtained;
the division length of the outgoing line sections of a single outgoing line is usually 2km, and the number of the outgoing line sections of the single outgoing line is determined according to the length of the outgoing line;
when a fault occurs in the power distribution network, the single-phase earth fault is positioned through the following steps:
1) judging all outgoing lines of the distribution network bus one by one, if B [ I, j ] < fabs (I0[ I ])/beta exists and A [ I, j ] < fabs (I2[ I ])/beta exists, judging that an [ I, j ] outgoing line section of the distribution network bus is a single-phase ground fault suspicious section, and classifying the ith outgoing line of the distribution network bus into a suspicious outgoing line set;
wherein, the suspicious outgoing line set is an initial empty set, the [ I, j ] outgoing line section refers to the j-th outgoing line section of the ith outgoing line of the power distribution network bus, B [ I, j ] is the bus side zero sequence current fault simulation value of the ith outgoing line of the power distribution network bus when the [ I, j ] outgoing line section simulates single-phase earth fault, I0[ I ] is the bus side zero sequence current real-time value of the ith outgoing line of the power distribution network bus at the bus outlet, A [ I, j ] is the bus side negative sequence current fault simulation value of the ith outgoing line of the power distribution network bus when the [ I, j ] outgoing line section simulates single-phase earth fault, I2[ I ] is the bus side negative sequence current real-time value of the ith outgoing line of the power distribution network bus at the bus outlet, beta is a load distribution factor, the value of beta is a constant, the value of the beta is usually 0.85, fabs is a function of absolute value of the parameter, the signs of I0[ I ] and I2[ I ] are that the inflow bus is negative, and the outflow bus is positive;
2) and calculating a zero sequence criterion factor and a negative sequence criterion factor, wherein the specific calculation formula is as follows:
wherein,is a zero sequence criterion factor, a negative sequence criterion factor, N is the total number of outgoing lines in the suspicious outgoing line set, M is the number of power supply transformers connected with the distribution network bus, I0T [ j]For the bus side zero sequence current real-time value of the jth outgoing line in the suspicious outgoing line set at the bus outlet, I2T [ j]Bus side negative sequence current real-time value for jth outlet in suspected outlet set, If0[ j]Bus-side zero-sequence current real-time values of the jth supply transformer connected to the distribution network bus, If2[ j]Real-time value of the negative-sequence current on the bus side of the jth supply transformer connected to the distribution network bus, I0T [ j]、I2T[j]、If0[j]、If2[j]The sign of (A) is negative by the inflow bus and positive by the outflow bus;
3) positioning the single-phase earth fault according to the zero sequence criterion factor and the negative sequence criterion factor;
if it is notOr the number is less than or equal to the Count, judging that the fault in the power distribution network is not a single-phase earth fault;
if it is notAnd is<Counting, namely judging that a single-phase grounding fault occurs on an outgoing line with the maximum bus side zero sequence current real-time value in the suspicious outgoing line set, wherein an outgoing line section to which a fault point belongs is the outgoing line section of the outgoing line, and the bus side zero sequence current fault analog value is closest to the outgoing line section of the current bus side zero sequence current real-time value of the outgoing line;
wherein, Count is a constant, and the value thereof is usually 0.05.
In the embodiment of the invention, the bus side zero sequence current real-time value and the bus side negative sequence current real-time value of each outgoing line of the power distribution network bus at the bus outlet, the bus side zero sequence current real-time value and the bus side negative sequence current real-time value of each power supply transformer connected with the power distribution network bus, and the bus side negative sequence current fault analog value and the bus side zero sequence current fault analog value of each outgoing line section at the bus outlet can be obtained by utilizing the existing power energy management subsystem in the power system when each outgoing line section simulates a single-phase earth fault.
Claims (4)
1. A single-phase earth fault positioning method for a power distribution network comprises the following steps:
dividing each outgoing line of a power distribution network bus, equally dividing each outgoing line into a plurality of outgoing line sections, setting the load current of each outgoing line section to be 0 under the non-fault condition, simulating single-phase earth faults of each outgoing line section one by one, and respectively calculating a bus side negative sequence current fault simulation value and a bus side zero sequence current fault simulation value of each outgoing line section;
the bus side negative sequence current fault analog value of the outgoing line section is as follows: when the outgoing line section simulates a single-phase earth fault, the bus side negative sequence current value of the outgoing line section at the bus outlet is obtained;
the bus side zero sequence current fault analog value of the outgoing line section is as follows: when the outgoing line section simulates a single-phase earth fault, the bus-side zero-sequence current value of the outgoing line section at the bus outlet is obtained;
the method is characterized in that: when a fault occurs in the power distribution network, the single-phase earth fault is positioned through the following steps,
1) judging all outgoing lines of the distribution network bus one by one, if B [ I, j ] < fabs (I0[ I ])/beta exists and A [ I, j ] < fabs (I2[ I ])/beta exists, judging that an [ I, j ] outgoing line section of the distribution network bus is a single-phase ground fault suspicious section, and classifying the ith outgoing line of the distribution network bus into a suspicious outgoing line set;
wherein, the suspicious outgoing line set is an initial empty set, the [ I, j ] outgoing line section refers to the j-th outgoing line section of the ith outgoing line of the distribution network bus, B [ I, j ] is the bus side zero sequence current fault simulation value of the ith outgoing line of the distribution network bus when the [ I, j ] outgoing line section simulates a single-phase earth fault, I0[ I ] is the bus side zero sequence current real-time value of the ith outgoing line of the distribution network bus at the bus outlet, A [ I, j ] is the bus side negative sequence current fault simulation value of the ith outgoing line of the distribution network bus when the [ I, j ] outgoing line section simulates a single-phase earth fault, I2[ I ] is the bus side negative sequence current real-time value of the ith outgoing line of the distribution network bus at the bus outlet, beta is a load distribution factor, the value of beta is a constant, fabs is a function of taking absolute values of parameters, the signs of I0[ I ], I2[ I ] take the incoming bus as negative, the outflow bus is positive;
2) and calculating a zero sequence criterion factor and a negative sequence criterion factor, wherein the specific calculation formula is as follows:
wherein,is a zero-sequence criterion factor and is used as a zero-sequence criterion factor,is a negative sequence criterion factor, N is the total number of outgoing lines in the suspicious outgoing line set, M is the number of power supply transformers connected with the distribution network bus, I0T [ j]For the bus side zero sequence current real-time value of the jth outgoing line in the suspicious outgoing line set at the bus outlet, I2T [ j]Bus side negative sequence current real-time value for jth outlet in suspected outlet set, If0[ j]Bus-side zero-sequence current real-time values of the jth supply transformer connected to the distribution network bus, If2[ j]Real-time value of the negative-sequence current on the bus side of the jth supply transformer connected to the distribution network bus, I0T [ j]、I2T[j]、If0[j]、If2[j]The sign of (A) is negative by the inflow bus and positive by the outflow bus;
3) positioning the single-phase earth fault according to the zero sequence criterion factor and the negative sequence criterion factor;
if it is notNot less than Count orIf the number is less than or equal to Count, judging that the fault in the power distribution network is not a single-phase earth fault;
if it is not<Count and<counting, namely judging that a single-phase grounding fault occurs on an outgoing line with the maximum bus side zero sequence current real-time value in the suspicious outgoing line set, wherein an outgoing line section to which a fault point belongs is the outgoing line section of the outgoing line, and the bus side zero sequence current fault analog value is closest to the outgoing line section of the current bus side zero sequence current real-time value of the outgoing line;
wherein, Count is a constant.
2. The single-phase earth fault location method for the power distribution network according to claim 1, characterized in that: the outgoing line section of a single outgoing line is divided into 2km in length.
3. The single-phase earth fault location method for the power distribution network according to claim 1, characterized in that: beta is 0.85.
4. The single-phase earth fault location method for the power distribution network according to claim 1, characterized in that: the value of Count is 0.05.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410244694.3A CN104049177B (en) | 2014-06-04 | One-phase earthing failure in electric distribution network localization method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410244694.3A CN104049177B (en) | 2014-06-04 | One-phase earthing failure in electric distribution network localization method |
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| CN104049177A CN104049177A (en) | 2014-09-17 |
| CN104049177B true CN104049177B (en) | 2016-11-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995024014A2 (en) * | 1994-02-28 | 1995-09-08 | Abb Power T & D Company Inc. | One-terminal data fault location system |
| CN102253307A (en) * | 2011-04-19 | 2011-11-23 | 中国电力科学研究院 | Method for positioning single-phase grounding failure of distribution network containing distributed power supply |
| CN103245883A (en) * | 2013-04-27 | 2013-08-14 | 昆明理工大学 | Power distribution network fault circuit selection method based on transient zero-sequence current time-frequency characteristic vectors |
| CN103454555A (en) * | 2013-08-02 | 2013-12-18 | 西安交通大学 | Power distribution network single-phase earth fault section positioning method based on parameter identification |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995024014A2 (en) * | 1994-02-28 | 1995-09-08 | Abb Power T & D Company Inc. | One-terminal data fault location system |
| CN102253307A (en) * | 2011-04-19 | 2011-11-23 | 中国电力科学研究院 | Method for positioning single-phase grounding failure of distribution network containing distributed power supply |
| CN103245883A (en) * | 2013-04-27 | 2013-08-14 | 昆明理工大学 | Power distribution network fault circuit selection method based on transient zero-sequence current time-frequency characteristic vectors |
| CN103454555A (en) * | 2013-08-02 | 2013-12-18 | 西安交通大学 | Power distribution network single-phase earth fault section positioning method based on parameter identification |
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