CN105738751A - Setting calculation method for bus differential protection current loop line disconnection alarm fixed value - Google Patents
Setting calculation method for bus differential protection current loop line disconnection alarm fixed value Download PDFInfo
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- CN105738751A CN105738751A CN201610103553.9A CN201610103553A CN105738751A CN 105738751 A CN105738751 A CN 105738751A CN 201610103553 A CN201610103553 A CN 201610103553A CN 105738751 A CN105738751 A CN 105738751A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 94
- 238000000819 phase cycle Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 13
- 238000005259 measurement Methods 0.000 abstract 1
- 230000001681 protective Effects 0.000 description 2
- 208000008797 Situs Inversus Diseases 0.000 description 1
- 230000003044 adaptive Effects 0.000 description 1
- 230000001052 transient Effects 0.000 description 1
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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
Abstract
The invention disclose a setting calculation method for a bus differential protection current loop line disconnection alarm fixed value, which solves the problem that the current loop line disconnection alarm signal of the transformer substation bus protection frequently happens due to the fact that the current transformer substation bus differential protection current loop line disconnection alarm fixed value is not reasonable. The setting calculation method comprises steps of establishing an imbalance current calculation model of a power transmission circuit according to the usage tower types, the lead phase sequence arrangement and the line length of all power transmission circuits which are connected to one bus of the transformer substation, calculating the positive sequence current, the negative sequence current and the zero sequence current of each loop of the power transmission circuit and the imbalance degree of the zero sequence current, performing actual measurement on the secondary zero sequence imbalance current of all power transmission lines after the transformer substation is in operation, and performing adjustment on the bus protection current loop line disconnection alarm fixed value according to whether the degree of imbalance of the zero sequence current is not greater than 5%. The setting calculation method overcomes the frequent actions of the bus protection current loop line disconnection alarm signal of the transformer station, and guarantees the safety operation of the power grid.
Description
Technical field
The present invention relates to the setting method of a kind of substation bus bar differential protection current loop broken string alarm definite value; couple the adaptive setting of the bus differential protecting current loop broken string alarm definite value of many back transmission lines suitable in substation bus bar, enable substation bus bar differential protection current loop reliably and accurately to send warning signal when breaking.
Background technology
Development along with electrical network; different demands according to network load; electrical network occurs substantial amounts of short distance do not replace erection transmission line of electricity; the erection (or non-complete transposition) that do not replace of these short distance transmission lines of electricity; three-phase current unbalance degree is made to aggravate; the bus protection current loop broken string alarm causing transformer station frequently occurs, and has had influence on the safe operation of electrical network.Trace it to its cause: one is the designing requirement according to transmission line of electricity, do not replace when transmission line of electricity full line length is less than 100 kilometers, due to the short-term road increasing number that do not replace, result in transmission line parameter asymmetric, in turn result in transmission line of electricity three-phase current unbalance；Two is when adjusting bus differential protection current loop broken string alarm definite value, only accounts for the different model of current transformer, does not consider that the unloaded capacitance current of transmission line of electricity and transmission line wire phase sequence arrange the zero sequence out-of-balance current caused.Above reason result in current loop broken string warning signal in bus differential protecting and frequently occurs; for ensureing accurately and reliably sending of current loop broken string warning signal in bus differential protecting; need the influence factor of its definite value of adjusting is analyzed comprehensively, redefine its synchronizing calculation method.
Summary of the invention
The invention provides the synchronizing calculation method of a kind of substation bus bar differential protection current loop broken string alarm definite value; solve owing to existing substation bus bar differential protection current loop broken string alarm fixed value adjusting is unreasonable, cause the technical barrier that the current loop broken string warning signal that substation bus bar is protected frequently occurs.
The present invention solves above technical problem by the following technical programs:
The synchronizing calculation method of a kind of bus differential protecting current loop broken string alarm definite value, comprises the following steps:
The first step, the N back transmission line that same for transformer station bus couples is ranked up, the parameter subscript I of the first back transmission line is represented, being represented by the parameter subscript II of the second back transmission line, by that analogy, the parameter subscript N of N back transmission line represents；
Second step, the actual track length of each back transmission line, the tower used and the transmission line of electricity coupled according to the same bus of transformer station Traverse phase-order arrangement, set up the out-of-balance current computation model of each back transmission line respectively；
3rd step, the I back transmission line set up according to second step out-of-balance current computation model, calculate the forward-order current I of I back transmission lineI 1, negative-sequence current II 2, zero-sequence current II 0；
4th step, return according to ii, ii I returns ... the out-of-balance current computation model of N back transmission line, calculate that ii is returned, ii I returns ... the positive sequence of N back transmission line, negative phase-sequence and zero-sequence current；
5th step, below equation is utilized to calculate the zero-sequence current degree of unbalancedness of I, II ... N back transmission line:
；
；
…
；
、…It it is the zero-sequence current degree of unbalancedness of I, II ... N back transmission line；
6th step, after transformer station puts into operation, the unloaded secondary zero-sequence current of I, II ... N back transmission line is surveyed, the result recorded is designated as、、…；
、、…It it is the unloaded secondary zero-sequence current of I, II ... N back transmission line；
If the zero-sequence current degree of unbalancedness of the m back transmission line in the 7th step I, II ... N back transmission line is, then the zero-sequence current definite value of the current loop broken string warning signal of the bus protection of this circuit carries out adjusting determining according to the following formula:
=0.25×+0.04++×；
The zero-sequence current definite value of the warning signal that breaks for m loop line road bus protection current loop；
Two sub-values for m loop line road maximum phase current；
For m loop line road Current Transformer Secondary rated current；
Zero-sequence current is surveyed for m back transmission line zero load secondary；
For m back transmission line zero-sequence current degree of unbalancedness；
For m back transmission line secondary forward-order current.
The synchronizing calculation method of a kind of bus differential protecting current loop described above broken string alarm definite value, the 7th step therein, if the zero-sequence current degree of unbalancedness of the m back transmission line in I, II ... N back transmission lineMore than 5%, then the zero-sequence current definite value of the current loop broken string warning signal of the bus protection of this circuit carries out adjusting determining according to the following formula:
=0.25×+0.04++×；
The zero-sequence current definite value of the warning signal that breaks for m loop line road bus protection current loop；
Two sub-values for m loop line road maximum phase current；
For m loop line road Current Transformer Secondary rated current；
Zero-sequence current is surveyed for m back transmission line zero load secondary；
For m back transmission line zero-sequence current degree of unbalancedness；
For m back transmission line secondary forward-order current.
The invention solves the unreasonable problem causing signal frequently to be reported to the police of zero-sequence current definite value of existing substation bus bar protective current circuit breaking warning signal; a kind of synchronizing calculation method reliably is provided for substation bus bar protective current circuit breaking warning signal; overcome the bus protection current loop broken string warning signal frequent movement of transformer station, ensure the safe operation of electrical network.
Detailed description of the invention
The present invention is described in detail below:
The synchronizing calculation method of a kind of bus differential protecting current loop broken string alarm definite value, comprises the following steps:
The first step, the N back transmission line that same for transformer station bus couples is ranked up, the parameter subscript I of the first back transmission line is represented, being represented by the parameter subscript II of the second back transmission line, by that analogy, the parameter subscript N of N back transmission line represents；
Second step, the actual track length of each back transmission line, the tower used and the transmission line of electricity coupled according to the same bus of transformer station Traverse phase-order arrangement, set up the out-of-balance current computation model of each back transmission line respectively；
3rd step, the I back transmission line set up according to second step out-of-balance current computation model, calculate the forward-order current I of I back transmission lineI 1, negative-sequence current II 2, zero-sequence current II 0；
4th step, return according to ii, ii I returns ... the out-of-balance current computation model of N back transmission line, calculate that ii is returned, ii I returns ... the positive sequence of N back transmission line, negative phase-sequence and zero-sequence current；
5th step, below equation is utilized to calculate the zero-sequence current degree of unbalancedness of I, II ... N back transmission line:
；
；
…
；
、…It it is the zero-sequence current degree of unbalancedness of I, II ... N back transmission line；
6th step, after transformer station puts into operation, the unloaded secondary zero-sequence current of I, II ... N back transmission line is surveyed, the result recorded is designated as、、…；
、、…It it is the unloaded secondary zero-sequence current of I, II ... N back transmission line；
If the zero-sequence current degree of unbalancedness of the m back transmission line in the 7th step I, II ... N back transmission line is, then the zero-sequence current definite value of the current loop broken string warning signal of the bus protection of this circuit carries out adjusting determining according to the following formula:
=0.25×+0.04++×；
The zero-sequence current definite value of the warning signal that breaks for m loop line road bus protection current loop；
Two sub-values for m loop line road maximum phase current；
For m loop line road Current Transformer Secondary rated current；
Zero-sequence current is surveyed for m back transmission line zero load secondary；
For m back transmission line zero-sequence current degree of unbalancedness；
For m back transmission line secondary forward-order current.
The 7th above-mentioned step, if the zero-sequence current degree of unbalancedness of the m back transmission line in I, II ... N back transmission lineMore than 5%, then the zero-sequence current definite value of the current loop broken string warning signal of the bus protection of this circuit carries out adjusting determining according to the following formula:
=0.25×+0.04++×；
The zero-sequence current definite value of the warning signal that breaks for m loop line road bus protection current loop；
Two sub-values for m loop line road maximum phase current；
For m loop line road Current Transformer Secondary rated current；
Zero-sequence current is surveyed for m back transmission line zero load secondary；
For m back transmission line zero-sequence current degree of unbalancedness；
For m back transmission line secondary forward-order current.
First the present invention is that all transmission lines of electricity coupled according to the same bus of transformer station use tower and Traverse phase-order arrangement and line length, set up the out-of-balance current computation model of transmission line of electricity, calculate positive and negative, zero-sequence current and the zero-sequence current degree of unbalancedness of every back transmission line.After transformer station puts into operation, the secondary zero sequence out-of-balance current of all transmission lines of electricity is surveyed；Finally according to zero-sequence current degree of unbalancedness whether more than 5%, the current loop broken string alarm definite value of bus differential protecting is adjusted.
The computational methods of power transmission line zero-sequence current unbalance factor, are make use of EM transient calculation method, every transmission line of electricity positive and negative, zero-sequence current computational methods are as follows:
……；
Wherein:For the vector calculus factor；
Zero-sequence current degree of unbalancedness computing formula is:
Zero-sequence current degree of unbalancedness=(zero-sequence current/forward-order current) × 100%.
Claims (2)
1. a synchronizing calculation method for bus differential protecting current loop broken string alarm definite value, comprises the following steps:
The first step, the N back transmission line that same for transformer station bus couples is ranked up, the parameter subscript I of the first back transmission line is represented, being represented by the parameter subscript II of the second back transmission line, by that analogy, the parameter subscript N of N back transmission line represents；
Second step, the actual track length of each back transmission line, the tower used and the transmission line of electricity coupled according to the same bus of transformer station Traverse phase-order arrangement, set up the out-of-balance current computation model of each back transmission line respectively；
3rd step, the I back transmission line set up according to second step out-of-balance current computation model, calculate the forward-order current I of I back transmission lineI 1, negative-sequence current II 2, zero-sequence current II 0；
4th step, return according to ii, ii I returns ... the out-of-balance current computation model of N back transmission line, calculate that ii is returned, ii I returns ... the positive sequence of N back transmission line, negative phase-sequence and zero-sequence current；
5th step, below equation is utilized to calculate the zero-sequence current degree of unbalancedness of I, II ... N back transmission line:
；
；
…
；
、…It it is the zero-sequence current degree of unbalancedness of I, II ... N back transmission line；
6th step, after transformer station puts into operation, the unloaded secondary zero-sequence current of I, II ... N back transmission line is surveyed, the result recorded is designated as、、…；
、、…It it is the unloaded secondary zero-sequence current of I, II ... N back transmission line；
If the zero-sequence current degree of unbalancedness of the m back transmission line in the 7th step I, II ... N back transmission line is, then the zero-sequence current definite value of the current loop broken string warning signal of the bus protection of this circuit carries out adjusting determining according to the following formula:
=0.25×+0.04++×；
The zero-sequence current definite value of the warning signal that breaks for m loop line road bus protection current loop；
Two sub-values for m loop line road maximum phase current；
For m loop line road Current Transformer Secondary rated current；
Zero-sequence current is surveyed for m back transmission line zero load secondary；
For m back transmission line zero-sequence current degree of unbalancedness；
For m back transmission line secondary forward-order current.
2. the synchronizing calculation method of a kind of bus differential protecting current loop according to claim 1 broken string alarm definite value, it is characterised in that the 7th step therein, if the zero-sequence current degree of unbalancedness of the m back transmission line in I, II ... N back transmission lineMore than 5%, then the zero-sequence current definite value of the current loop broken string warning signal of the bus protection of this circuit carries out adjusting determining according to the following formula:
=0.25×+0.04++×；
The zero-sequence current definite value of the warning signal that breaks for m loop line road bus protection current loop；
Two sub-values for m loop line road maximum phase current；
For m loop line road Current Transformer Secondary rated current；
Zero-sequence current is surveyed for m back transmission line zero load secondary；
For m back transmission line zero-sequence current degree of unbalancedness；
For m back transmission line secondary forward-order current.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121614A (en) * | 2017-03-29 | 2017-09-01 | 国家电网公司 | A kind of duplex configuration of bus protection transforms current loop polarity measurement method |
| US11143715B2 (en) * | 2019-08-15 | 2021-10-12 | Schweitzer Engineering Laboratories, Inc. | Broken conductor detection in a multiple-phase electric power delivery system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121614A (en) * | 2017-03-29 | 2017-09-01 | 国家电网公司 | A kind of duplex configuration of bus protection transforms current loop polarity measurement method |
| CN107121614B (en) * | 2017-03-29 | 2019-10-25 | 国家电网公司 | A kind of duplex configuration of bus protection transformation current loop polarity measurement method |
| US11143715B2 (en) * | 2019-08-15 | 2021-10-12 | Schweitzer Engineering Laboratories, Inc. | Broken conductor detection in a multiple-phase electric power delivery system |
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| CN105738751B (en) | 2018-02-16 |
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