CN103795075A - Phase sequence arrangement adjustment method for three-phase current unbalanced wires of transmission lines in transformer substation - Google Patents
Phase sequence arrangement adjustment method for three-phase current unbalanced wires of transmission lines in transformer substation Download PDFInfo
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- CN103795075A CN103795075A CN201410022007.3A CN201410022007A CN103795075A CN 103795075 A CN103795075 A CN 103795075A CN 201410022007 A CN201410022007 A CN 201410022007A CN 103795075 A CN103795075 A CN 103795075A
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- transmission line
- loop transmission
- sequence
- unbalance
- phase
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a phase sequence arrangement adjustment method for three-phase current unbalanced wires of transmission lines in a transformer substation to solve the problem that the three-phase current unbalance degree of existing transmission lines is increased, and therefore misoperation frequently occurs during zero-sequence protection for buses and the transmission lines of the transformer substation. The method include the steps of firstly, setting up an unbalance current simulating calculation model of all the connected transmission lines according to the types of towers used for all the transmission lines of the whole transformer substation, the phase sequence arrangement of all the transmission lines and the actual lengths of the transmission lines; secondly, calculating a positive-sequence current, a negative-sequence current and a zero-sequence current of each transmission line of the whole transformer substation and the zero-sequence current unbalance degree and the negative-sequence current unbalance degree of each transmission line. By changing the phase sequence arrangement of the wires of the transmission lines, the zero-sequence current unbalance degree and the negative-sequence current unbalance degree of each transmission line are controlled below 5% until the zero-sequence current unbalance degrees and the negative-sequence current unbalance degrees of all the transmission lines of the transformer substation are calculated to be lower than 5%. The simple and practical adjustment method is provided for the optimal phase sequence arrangement of the wires of all the transmission lines of the transformer substation.
Description
Technical field
The present invention relates to the method for adjustment of the Traverse phase-order arrangement of transmission line three-phase current unbalance in a kind of transformer station, be applicable to the transmission pressure of the many back transmission lines of transformer station to carry out rational phase sequence arrangement, make entirely the stand degree of unbalance of electric current of transformer station drop to minimum.
Background technology
Along with the rapid growth of power load; in electrical network, there is a large amount of short-range single back transmission line and same tower double back transmission line; these short-range transmission lines generally adopt the mode that does not replace and set up; make the aggravation of three-phase current unbalance degree; cause the bus of transformer station and the misoperation of power transmission line zero-sequence protection frequently to occur, had influence on the safe operation of electrical network.Entangle its reason: the one, according to the designing requirement of transmission line, in the time that being less than 100 kilometers completely, transmission line do not replace, and short (or ultrashort) circuit that these do not replace increases too many; The 2nd, many lists return and the common-tower double-return impact that the construction of line puts into operation in succession that do not replace; These two reasons directly cause part transmission line electric parameter asymmetric, and then cause three-phase current unbalance degree to increase.
Summary of the invention
The invention provides transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in a kind of transformer station; solve the three-phase current unbalance degree aggravation due to existing transmission line, caused the bus protection of transformer station and the frequent technical problem occurring of misoperation of power transmission line zero-sequence protection.
The present invention solves above technical problem by the following technical programs:
Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in a kind of transformer station, comprises the following steps:
The first step, the N loop transmission line that full transformer station station is connected sort, the electric current of the first loop transmission line is represented with subscript I, the electric current of second servo loop transmission line is represented with subscript II, and by that analogy, the electric current of the N loop transmission line at the full station of transformer station represents with subscript N;
The phase sequence of actual track length, the tower using and the transmission line of second step, each loop transmission line of connecting for the full station of transformer station is arranged, and sets up respectively the unsymmetrical current Simulation Calculation of loop transmission line separately;
The unsymmetrical current Simulation Calculation of the 3rd step, the first loop transmission line of setting up according to second step, utilizes electro-magnetic transient computing method, calculates the forward-order current of the first loop transmission line
, negative-sequence current
, zero-sequence current
;
The 4th step, the following formula of utilization calculate the zero-sequence current degree of unbalance of the first loop transmission line and the negative-sequence current degree of unbalance of the first loop transmission line:
If the zero-sequence current degree of unbalance of the 5th step the first loop transmission line
negative-sequence current degree of unbalance with the first loop transmission line
have one to exceed 5%, the phase sequence that changes the first loop transmission line is arranged, and repeats the step of above-mentioned second step to the four steps, if the zero-sequence current degree of unbalance of the first loop transmission line newly calculating
negative-sequence current degree of unbalance with the first loop transmission line
still have one to exceed 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the four steps, until the zero-sequence current degree of unbalance of the first loop transmission line calculating
negative-sequence current degree of unbalance with the first loop transmission line
all be less than till 5%, the phase sequence of the first loop transmission line is now arranged as adjusts to the right place;
The 6th step, successively second servo loop transmission line is repeated the step of second step to the five steps to N loop transmission line, the phase sequence that the phase sequence of second servo loop transmission line is aligned to N loop transmission line is arranged and is all adjusted to the right place.
The invention solves the transmission system three-phase current unbalance that the full station of existing transformer station causes due to Traverse phase-order unreasonable structure and arrangement due to single back transmission line and double back transmission line; for the optimal arrangement of the Traverse phase-order of transformer station's all transmission lines in full station provides a kind of simple and practical method of adjustment; overcome the bus protection of transformer station and the misoperation of power transmission line zero-sequence protection, ensured the safe operation of electrical network.
Embodiment
The present invention is described in detail below:
Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in a kind of transformer station, comprises the following steps:
The first step, the N loop transmission line that full transformer station station is connected sort, the electric current of the first loop transmission line is represented with subscript I, the electric current of second servo loop transmission line is represented with subscript II, and by that analogy, the electric current of the N loop transmission line at the full station of transformer station represents with subscript N;
The phase sequence of actual track length, the tower using and the transmission line of second step, each loop transmission line of connecting for the full station of transformer station is arranged, and sets up respectively the unsymmetrical current Simulation Calculation of loop transmission line separately;
The unsymmetrical current Simulation Calculation of the 3rd step, the first loop transmission line of setting up according to second step, utilizes electro-magnetic transient computing method, calculates the forward-order current of the first loop transmission line
, negative-sequence current
, zero-sequence current
;
The 4th step, the following formula of utilization calculate the zero-sequence current degree of unbalance of the first loop transmission line and the negative-sequence current degree of unbalance of the first loop transmission line:
If the zero-sequence current degree of unbalance of the 5th step the first loop transmission line
negative-sequence current degree of unbalance with the first loop transmission line
have one to exceed 5%, the phase sequence that changes the first loop transmission line is arranged, and repeats the step of above-mentioned second step to the four steps, if the zero-sequence current degree of unbalance of the first loop transmission line newly calculating
negative-sequence current degree of unbalance with the first loop transmission line
still have one to exceed 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the four steps, until the zero-sequence current degree of unbalance of the first loop transmission line calculating
negative-sequence current degree of unbalance with the first loop transmission line
all be less than till 5%, the phase sequence of the first loop transmission line is now arranged as adjusts to the right place;
The 6th step, successively second servo loop transmission line is repeated the step of second step to the five steps to N loop transmission line, the phase sequence that the phase sequence of second servo loop transmission line is aligned to N loop transmission line is arranged and is all adjusted to the right place.
The present invention uses tower and phase sequence to arrange and actual track length according to transformer station's all transmission lines in full station, set up the unsymmetrical current Simulation Calculation of the each loop transmission line connecting, then, calculate positive and negative, the zero-sequence current of transformer station's every transmission line in full station and zero sequence, negative-sequence current degree of unbalance.Be arranged with 6 kinds because same tower double back transmission line Traverse phase-order is arranged with 36 kinds, single back transmission line phase sequence, arrange by the phase sequence that changes transmission line wire, the zero sequence of this loop transmission line and negative-sequence current degree of unbalance are controlled at below 5%.Constantly repeat above-mentioned computational methods, until calculate all transmission lines of transformer station zero, negative-sequence current degree of unbalance is all less than 5%, the conducting wire phase sequence of so just having determined all transmission lines in full station is arranged as best phase sequence and arranges.
The computational methods of current unbalance factor, are to have utilized electro-magnetic transient computing method, every transmission line positive and negative, zero-sequence current computational methods are as follows:
……
Wherein:
for the vector calculus factor;
Zero-sequence current degree of unbalance computing formula is:
Zero-sequence current degree of unbalance=(zero-sequence current/forward-order current) × 100%;
Negative-sequence current degree of unbalance computing formula is:
Negative-sequence current degree of unbalance=(negative-sequence current/forward-order current) × 100%.
Claims (1)
1. a transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station, comprises the following steps:
The first step, the N loop transmission line that full transformer station station is connected sort, the electric current of the first loop transmission line is represented with subscript I, the electric current of second servo loop transmission line is represented with subscript II, and by that analogy, the electric current of the N loop transmission line at the full station of transformer station represents with subscript N;
The phase sequence of actual track length, the tower using and the transmission line of second step, each loop transmission line of connecting for the full station of transformer station is arranged, and sets up respectively the unsymmetrical current Simulation Calculation of loop transmission line separately;
The unsymmetrical current Simulation Calculation of the 3rd step, the first loop transmission line of setting up according to second step, utilizes electro-magnetic transient computing method, calculates the forward-order current of the first loop transmission line
, negative-sequence current
, zero-sequence current
;
The 4th step, the following formula of utilization calculate the zero-sequence current degree of unbalance of the first loop transmission line and the negative-sequence current degree of unbalance of the first loop transmission line:
If the zero-sequence current degree of unbalance of the 5th step the first loop transmission line
negative-sequence current degree of unbalance with the first loop transmission line
have one to exceed 5%, the phase sequence that changes the first loop transmission line is arranged, and repeats the step of above-mentioned second step to the four steps, if the zero-sequence current degree of unbalance of the first loop transmission line newly calculating
negative-sequence current degree of unbalance with the first loop transmission line
still have one to exceed 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the four steps, until the zero-sequence current degree of unbalance of the first loop transmission line calculating
negative-sequence current degree of unbalance with the first loop transmission line
all be less than till 5%, the phase sequence of the first loop transmission line is now arranged as adjusts to the right place;
The 6th step, successively second servo loop transmission line is repeated the step of second step to the five steps to N loop transmission line, the phase sequence that the phase sequence of second servo loop transmission line is aligned to N loop transmission line is arranged and is all adjusted to the right place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410022007.3A CN103795075B (en) | 2014-01-18 | 2014-01-18 | Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410022007.3A CN103795075B (en) | 2014-01-18 | 2014-01-18 | Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station |
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| CN103795075A true CN103795075A (en) | 2014-05-14 |
| CN103795075B CN103795075B (en) | 2015-09-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106097143A (en) * | 2016-06-15 | 2016-11-09 | 国网江西省电力科学研究院 | A kind of method choosing the optimum phase sequence arrangement mode of multiple-circuit on same tower |
| CN108631341A (en) * | 2018-05-17 | 2018-10-09 | 福建奥通迈胜电力科技有限公司 | Distribution low-voltage side current three-phase imbalance appraisal procedure based on zero-sequence current |
| CN113752921A (en) * | 2021-10-20 | 2021-12-07 | 西南交通大学 | Method for erecting special power transmission line for electrified railway |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030055585A1 (en) * | 2001-09-13 | 2003-03-20 | Stoupis James D. | Crossover fault classification for power lines with parallel circuits |
| CN102916427A (en) * | 2012-09-25 | 2013-02-06 | 广东电网公司电力科学研究院 | Method for calculating integrated three-phase imbalance degree of multi-circuit transmission lines |
| CN102938010A (en) * | 2012-12-10 | 2013-02-20 | 上海市电力公司 | Parallel circuit unbalance degree analysis method |
| CN103235198A (en) * | 2013-04-14 | 2013-08-07 | 国家电网公司 | Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines |
| CN103412199A (en) * | 2013-08-12 | 2013-11-27 | 上海电力学院 | Computing method of unbalancedness of multi-circuit power transmission lines on same tower |
-
2014
- 2014-01-18 CN CN201410022007.3A patent/CN103795075B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030055585A1 (en) * | 2001-09-13 | 2003-03-20 | Stoupis James D. | Crossover fault classification for power lines with parallel circuits |
| CN102916427A (en) * | 2012-09-25 | 2013-02-06 | 广东电网公司电力科学研究院 | Method for calculating integrated three-phase imbalance degree of multi-circuit transmission lines |
| CN102938010A (en) * | 2012-12-10 | 2013-02-20 | 上海市电力公司 | Parallel circuit unbalance degree analysis method |
| CN103235198A (en) * | 2013-04-14 | 2013-08-07 | 国家电网公司 | Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines |
| CN103412199A (en) * | 2013-08-12 | 2013-11-27 | 上海电力学院 | Computing method of unbalancedness of multi-circuit power transmission lines on same tower |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106097143A (en) * | 2016-06-15 | 2016-11-09 | 国网江西省电力科学研究院 | A kind of method choosing the optimum phase sequence arrangement mode of multiple-circuit on same tower |
| CN108631341A (en) * | 2018-05-17 | 2018-10-09 | 福建奥通迈胜电力科技有限公司 | Distribution low-voltage side current three-phase imbalance appraisal procedure based on zero-sequence current |
| CN108631341B (en) * | 2018-05-17 | 2021-12-21 | 福建奥通迈胜电力科技有限公司 | Zero-sequence current-based three-phase unbalance evaluation method for distribution transformer low-voltage side current |
| CN113752921A (en) * | 2021-10-20 | 2021-12-07 | 西南交通大学 | Method for erecting special power transmission line for electrified railway |
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| CN103795075B (en) | 2015-09-09 |
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