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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
current
transmission line
zero
back transmission
sequence current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610103553.9A
Other languages
Chinese (zh)
Other versions
CN105738751B (en
Inventor
张悦
潘秀宝
宋国兵
唐震
白瑞
杨华
张进
张友富
宋胜利
李彪
王洪
王欣伟
续建国
王小琪
朱良肄
王浩
杨林也
董理科
吴明锋
孙立时
张卫东
赵江涛
高清平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Original Assignee
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd filed Critical Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Priority to CN201610103553.9A priority Critical patent/CN105738751B/en
Publication of CN105738751A publication Critical patent/CN105738751A/en
Application granted granted Critical
Publication of CN105738751B publication Critical patent/CN105738751B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing 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

A kind of synchronizing calculation method of bus differential protecting current loop broken string alarm definite value
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.
CN201610103553.9A 2016-02-25 2016-02-25 A kind of synchronizing calculation method of bus differential protecting current loop broken string alarm definite value Active CN105738751B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610103553.9A CN105738751B (en) 2016-02-25 2016-02-25 A kind of synchronizing calculation method of bus differential protecting current loop broken string alarm definite value

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610103553.9A CN105738751B (en) 2016-02-25 2016-02-25 A kind of synchronizing calculation method of bus differential protecting current loop broken string alarm definite value

Publications (2)

Publication Number Publication Date
CN105738751A true CN105738751A (en) 2016-07-06
CN105738751B CN105738751B (en) 2018-02-16

Family

ID=56248478

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610103553.9A Active CN105738751B (en) 2016-02-25 2016-02-25 A kind of synchronizing calculation method of bus differential protecting current loop broken string alarm definite value

Country Status (1)

Country Link
CN (1) CN105738751B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08223788A (en) * 1995-02-10 1996-08-30 Masaji Nakajima Automatic section switch
US20030078745A1 (en) * 2001-10-24 2003-04-24 Roberts Jeffrey B. Directional element to determine faults on ungrounded power systems
JP2007113917A (en) * 2005-10-18 2007-05-10 Meidensha Corp Degradation detector for power transmission or distribution wire
CN101435843A (en) * 2008-07-18 2009-05-20 贾贤 Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value
CN101673942A (en) * 2009-08-20 2010-03-17 北京四方继保自动化股份有限公司 Positive-negative sequence current differential protection method
CN101694505A (en) * 2009-09-24 2010-04-14 江苏省电力公司南通供电公司 Method for simulating load test with transformer substation bus differential protection current
CN103389422A (en) * 2013-07-19 2013-11-13 国家电网公司 Method for detecting non-fault phase busbar differential protection maloperation cause during circuit reclosing period
CN103944142A (en) * 2014-03-27 2014-07-23 天津大学 Transformer phase fault backup protection method based on offset voltage positive-sequence component
CN104111407A (en) * 2014-07-09 2014-10-22 华中科技大学 Fault detection method based on impedance ratio same-tower power transmission line transverse differential protection
CN204462305U (en) * 2015-03-16 2015-07-08 王金泽 A kind of distribution line disconnection monitor based on electric current and voltage vector

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08223788A (en) * 1995-02-10 1996-08-30 Masaji Nakajima Automatic section switch
US20030078745A1 (en) * 2001-10-24 2003-04-24 Roberts Jeffrey B. Directional element to determine faults on ungrounded power systems
JP2007113917A (en) * 2005-10-18 2007-05-10 Meidensha Corp Degradation detector for power transmission or distribution wire
CN101435843A (en) * 2008-07-18 2009-05-20 贾贤 Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value
CN101673942A (en) * 2009-08-20 2010-03-17 北京四方继保自动化股份有限公司 Positive-negative sequence current differential protection method
CN101694505A (en) * 2009-09-24 2010-04-14 江苏省电力公司南通供电公司 Method for simulating load test with transformer substation bus differential protection current
CN103389422A (en) * 2013-07-19 2013-11-13 国家电网公司 Method for detecting non-fault phase busbar differential protection maloperation cause during circuit reclosing period
CN103944142A (en) * 2014-03-27 2014-07-23 天津大学 Transformer phase fault backup protection method based on offset voltage positive-sequence component
CN104111407A (en) * 2014-07-09 2014-10-22 华中科技大学 Fault detection method based on impedance ratio same-tower power transmission line transverse differential protection
CN204462305U (en) * 2015-03-16 2015-07-08 王金泽 A kind of distribution line disconnection monitor based on electric current and voltage vector

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
周津生: "关于JCD—4A差动保护整定与调试", 《电力自动化设备》 *
张悦: "电流互感器二次回路断线在差动保护中的应用", 《山西电力技术》 *
王沛文: "防止变压器差动保护电流回路断线误动的措施", 《华北电力技术》 *
王翠霞: "关于微机型电动机保护定值的整定计算", 《电气传动自动化》 *

Cited By (3)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
CN105738751B (en) 2018-02-16

Similar Documents

Publication Publication Date Title
Nayak et al. Wide-area measurement-based backup protection for power network with series compensation
CN102590655B (en) Failure direction judgment element and judgment method for direct current transmission line
CN104267311B (en) Phase selection method for faults of double-circuit lines on same tower
El Halabi et al. Current phase comparison pilot scheme for distributed generation networks protection
CN107611943B (en) Small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method
Makwana et al. A new adaptive distance relaying scheme for mutually coupled series-compensated parallel transmission lines during intercircuit faults
CN106959403B (en) A kind of distributed generation resource access distribution net work earthing fault detection method
CN104578013B (en) A kind of direction protection method of the power distribution network containing DFIG based on power frequency difference
CN106771804B (en) A kind of transmission line of electricity broken string area judging method based on zero-sequence network
CN102590654B (en) Element and method for discriminating fault electrode of DC transmission line
CN104730416B (en) A kind of transmission line of electricity method of single end distance measurement using jump-value of current as amount of polarization
CN106684834B (en) A kind of power distribution network adaptive Current Protection system and method
Petit et al. Directional relays without voltage sensors for distribution networks with distributed generation: Use of symmetrical components
CN104111403A (en) Microcomputer integrated protection line-selection method for low-current earthed power system
CN107315128A (en) A kind of distributed earthing wire-selecting method and system based on GOOSE
Tiwari et al. Review on protection issues with penetration of distributed generation in distribution system
CN104052035B (en) Same-tower double-circuit line single-phase grounded reactance relay
Nayak et al. Detecting fault during power swing for a series compensated line
Mirsaeidi et al. Modeling and simulation of a communication-assisted digital protection scheme for micro-grids
CN105738751A (en) Setting calculation method for bus differential protection current loop line disconnection alarm fixed value
CN103235198B (en) Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines
CN103166207A (en) Line single-phase earth fault relay protection method based on along-the-line voltage drop characteristic
CN101847863B (en) Relay protection method for double-circuit transmission lines on same tower
CN104979808B (en) A kind of inverter calculation of penetration level method counted and longitudinal difference protection influences
Kumar et al. Fault detection in a series compensated line during power swing using superimposed apparent power

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant