CN103683216B - A kind of differential protection method for bus - Google Patents

A kind of differential protection method for bus Download PDF

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Publication number
CN103683216B
CN103683216B CN201310603647.9A CN201310603647A CN103683216B CN 103683216 B CN103683216 B CN 103683216B CN 201310603647 A CN201310603647 A CN 201310603647A CN 103683216 B CN103683216 B CN 103683216B
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CN
China
Prior art keywords
current
electric power
incoming line
power incoming
bus
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Expired - Fee Related
Application number
CN201310603647.9A
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Chinese (zh)
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CN103683216A (en
Inventor
卢站芳
何静利
易永辉
路光辉
马仪成
李洪凯
郭旭
和红伟
梁东森
曹瑞林
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XJ Electric Co Ltd
Xuchang XJ Software Technology Co Ltd
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XJ Electric Co Ltd
Xuchang XJ Software Technology Co Ltd
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Priority to CN201310603647.9A priority Critical patent/CN103683216B/en
Publication of CN103683216A publication Critical patent/CN103683216A/en
Application granted granted Critical
Publication of CN103683216B publication Critical patent/CN103683216B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The present invention relates to a kind of differential protection method for bus; including current differential element, CT saturation discriminating element, voltage blocking element, also include the current interlock element being made up of electric power incoming line current interlock element and electric power incoming line jump-value of current blocking element.The invention has the beneficial effects as follows:The current stabilization that collected by the use of at electric power incoming line is reliable and can accurately reflect the characteristics of whether there is failure behind service entrance switch as the blocking element of bus differential protecting; improvement currently prevents the not enough situation of misoperation measure, realizes bus differential protecting in the safe and reliable use of below 35kV electric pressure bus-bar systems.

Description

A kind of differential protection method for bus
Technical field
The present invention relates to a kind of differential protection method for bus.
Background technology
Bus current differential protection becomes current bus protection with accurately identifying troubles inside the sample space due to its susceptiveness Principal mode;But with the applied environment such as one-end substation low-pressure side bus or Auxiliary System in Power Plant bus as outlet is many Many, bus protection wiring is complicated, frequent operation, easily causes protection misoperation.
Existing frequently-used bus differential protecting is the voltage of voltage blocking current differential protection, i.e. blocking element using collection As judgement basis, by the use of electric current as the basis of differential protection entry condition.
It is existing some subject matters be:As on bus, electric current and disconnecting link position signalling will be accessed by all intervals Protection device causes wiring complicated, and particularly as outgoing line interval is numerous on low-voltage bus bar, and Jing is often operated, and maloperation causes The probability of protection misoperation is very big;It is differential in the case of in order to test current to be sealed in protection device in outlet switch maintenance mistiming Protection not misoperation, generally require a disconnecting link position contact or maintenance pressing plate access protection device, and in low-pressure system position Contact is insecure, therefore malfunction is very risky;As outlet load fluctuation can cause voltage blocking to open, therefore merely Voltage blocking can not avoid misoperation very well.
The content of the invention
It is an object of the invention to provide a kind of differential protection method for bus, can not be good to solve original differential protection Avoid misoperation problem.
For achieving the above object, the solution of the present invention includes:
A kind of differential protection method for bus, comprises the steps:
1) original differential protection condition:Current differential protection starting element, CT saturation discriminating element, voltage are closed Locking element performs corresponding judgement;
2) the current transformer collection electric current at electric power incoming line, judges whether each electric power incoming line electric current summation exceedes First setting valve IS1, judge jump-value of current whether more than the second setting valve IS2, when corresponding current is more than the first setting valve or During two setting valves, current interlock element open and protection locking;
3) in the case where original differential protection condition, and above-mentioned current interlock element open and protection locking is met, send out Go out trip signal.
Judge each electric power incoming line electric current summation whether more than the first setting valve IS1Using:Id>IS1
Wherein:IdFor electric power incoming line latching current,For current each electric power incoming line electric current;IS1For Inlet wire current locking setting valve, IS1The maximum of electric power incoming line during to escape all load outlet normal power supplies on bus of adjusting is powered Electric current.
Judge jump-value of current whether more than the second setting valve IS2Using:Id>IRAnd △ Id>IS2(equation 2);
Bus is opened when this equation is mainly used in Smaller load or no-load running and when busbar short-circuit trouble point has transition resistance Differential protection is exported.
Wherein:IdFor electric power incoming line latching current,For current each electric power incoming line current vector; IRFor the electric power incoming line latching current of 2 weeks wavefront,For electric power incoming line 2 weeks wavefront electric current Vector;△IdFor electric power incoming line Sudden Changing Rate latching current,IS2For electric power incoming line Sudden Changing Rate electricity Stream locking definite value, IS2Adjust to escape dash current maximum when outlet is closed a floodgate.
Defect of the present invention for original differential protection, such as voltage blocking occur in bus current differential protection cannot The situation of locking, so introducing current interlock protection element.
It is 35kV the and 10kV side bus and Auxiliary System in Power Plant bus of common 110kV one-end substations as shown in Figure 1, Figure 2, The characteristics of this kind of bus is the bus-bar system of less electric power incoming line and multiple load outlets.Investigating this kind of sharing of load that is provided with is The bus-bar system of purpose, is exactly that electric power incoming line and interconnection are less, and load outlet is many characteristics of they have common, thus electric Source point of incoming cables TA rated current are larger, general 2000A~4000A;TA at electric power incoming line is selected as 5P20 or 5P30 transformers; The busbar short-circuit fault current of design is generally below 30000A;Therefore this kind of bus-bar system bus is electric in area's internal short-circuit failure Source point of incoming cables TA typically will not saturation (even if slight saturation occur nor affects on protection identification), so the TA at electric power incoming line is electric Stream is reliable, can accurately differentiate whether there is short trouble behind inlet wire TA.The bus area internal short-circuit certainty of this kind of bus-bar system Cause TA electric currents increase at electric power incoming line;And outgoing line interval maloperation, checking experiment electric current seal in it is unreliable with disconnecting link position etc. Factor does not then result in TA electric currents increase at electric power incoming line switch.
So electric current at electric power incoming line as differential protection blocking element can effectively in fault-free locking is differential Protection and open differential protection in failure, and maloperation, the connecting point position false protection for causing such as unreliable can be prevented effectively from Make.The present invention is on the basis of existing protection device, using the current interlock element at electric power incoming line and jump-value of current locking Element prevents misoperation, and improves the reliability of bus differential protecting action and simplify wiring.For many electric power incoming lines (and bag Containing mother segmentation, interconnection) bus wiring system, the such as mode of connection of accompanying drawing 2, current interlock element and jump-value of current are closed The electric current of locking element is that the vector sum calculating of multiple electric power incoming line electric currents is obtained.
Description of the drawings
Fig. 1 is single bus scheme mode;
Fig. 2 is single mother partition mode of connection;
Fig. 3 is operational flow diagram of the electric power incoming line current interlock element in microcomputer protecting device;
Fig. 4 is the bus differential protecting logic chart of the present invention.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
The present invention is started comprising traditional current differential protection based on existing micro-computer bus-differential protection device Element, CT saturation discriminating element, voltage blocking element, the startup method of these elements and setting method with it is existing Voltage blocking current differential protection method is essentially identical, and the present invention increased electric current on the basis of traditional voltage blocking element Blocking element, current interlock element include two parts, and Part I is electric power incoming line current interlock element, and Part II is power supply Inlet wire current Sudden Changing Rate blocking element.As shown in figure 4, original bus differential protecting include current differential protection starting element, CT saturation discriminating element, voltage blocking element, on the basis of original differential protection criterion is not changed, increase If carrying out the current interlock element of locking judgement using the electric current in electric power incoming line section, by electric power incoming line current interlock element and electricity Source inlet wire current Sudden Changing Rate blocking element carry out or computing after add and carry out with original element and computing, locking in this way Trip protection.For the bus wiring system of many electric power incoming lines, the electric current of current interlock element is multiple electric power incoming line switches Obtain with Current calculation.
Guard method using this bus differential protecting for adding current interlock is as follows:
1) original differential protection condition:Current differential protection starting element, CT saturation discriminating element, voltage are closed Locking element performs corresponding judgement;
2) the current transformer collection electric current at electric power incoming line, judges whether each electric power incoming line electric current summation exceedes First setting valve IS1, judge jump-value of current whether more than the second setting valve IS2, when corresponding current is more than the first setting valve or During two setting valves, current interlock element open and protection locking;
3) in the case where original differential protection condition, and above-mentioned current interlock element open and protection locking is met, send out Go out trip signal.
Above-mentioned current differential protection starting element, CT saturation discriminating element, voltage blocking element perform corresponding Judgement refers to respectively:Current differential protection starting element judge into line segment current transformer measurement current value and with go out line segment electric current Whether the difference of the current value sum of transformer measurement exceedes setting valve;CT saturation discriminating element enters line segment described in judging Current transformer and go out line segment current transformer whether saturation, when unsaturated, the saturation judgment component open and protection locking;Electricity Press off locking element and judge whether voltage conditions meet open differential protection barring condition, if meeting open differential protection barring condition Then open and protection locking.These belong to original differential protection condition, will not be described in detail herein.
A kind of specific current interlock element, including electric power incoming line current interlock element and electric power incoming line electric current is given below Sudden Changing Rate blocking element, judges flow process as shown in figure 3, concrete Rule of judgment is as follows:
(1) open-equation of electric power incoming line current interlock is:
Id>IS1(equation 1)
This equation is for the open bus differential protecting outlet in the case of typical bus-bar fault.
Wherein:IdFor electric power incoming line latching current,For current each electric power incoming line electric current;IS1For Inlet wire current locking setting valve, IS1The maximum of electric power incoming line during to escape all load outlet normal power supplies on bus of adjusting is powered Electric current.
(2) voltage carries out the open-equation of jump-value of current locking:
Id>IRAnd △ Id>IS2(equation 2)
Bus is opened when this equation is mainly used in Smaller load or no-load running and when busbar short-circuit trouble point has transition resistance Differential protection is exported.
Wherein:IdFor electric power incoming line latching current,For current each electric power incoming line current vector; IRFor the electric power incoming line latching current of 2 weeks wavefront,For electric power incoming line 2 weeks wavefront electric current Vector;△IdFor electric power incoming line Sudden Changing Rate latching current,IS2For electric power incoming line Sudden Changing Rate electricity Stream locking definite value, IS2Adjust to escape dash current maximum when outlet is closed a floodgate.
It will be apparent to those skilled in the art that the selection of the condition such as specific decisive equation, periodicity can be according to this Bright method is adjusted and without departing from the scope of protection of present invention.

Claims (3)

1. a kind of differential protection method for bus, it is characterised in that comprise the steps:
1) original differential protection condition:Current differential protection starting element, CT saturation discriminating element, voltage blocking unit Part performs corresponding judgement;
2) whether the current transformer collection electric current at electric power incoming line, judge each electric power incoming line electric current summation more than first Setting valve IS1, judge electric power incoming line jump-value of current whether more than the second setting valve IS2, when corresponding current is more than the first setting valve Or during the second setting valve, current interlock element open and protection locking;
3) in the case where original differential protection condition, and above-mentioned current interlock element open and protection locking is met, send jump Lock signal.
2. a kind of differential protection method for bus according to claim 1, it is characterised in that each electric power incoming line electricity of the judgement Whether stream summation is more than the first setting valve IS1Using:Id>IS1
Wherein:IdFor electric power incoming line latching current, For current each electric power incoming line current vector;IS1To enter Line current locking setting valve, IS1The maximum of electric power incoming line during to escape all load outlet normal power supplies on bus of adjusting is powered electric Stream.
3. a kind of differential protection method for bus according to claim 1, it is characterised in that judge whether jump-value of current surpasses Cross the second setting valve IS2Using:Id>IRAnd △ Id>IS2
Bus differential protecting is opened when above formula is used for Smaller load or no-load running and when busbar short-circuit trouble point has transition resistance to go out Mouthful;Wherein:IdFor electric power incoming line latching current, For current each electric power incoming line current vector;IRFor 2 weeks The electric power incoming line latching current of wavefront, For electric power incoming line 2 weeks wavefront current vector;△Id For electric power incoming line Sudden Changing Rate latching current,IS2It is fixed for electric power incoming line Sudden Changing Rate current interlock Value, IS2Adjust to escape dash current maximum when outlet is closed a floodgate.
CN201310603647.9A 2013-11-25 2013-11-25 A kind of differential protection method for bus Expired - Fee Related CN103683216B (en)

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Publication number Priority date Publication date Assignee Title
CN106684823B (en) * 2016-12-14 2019-04-09 国网北京市电力公司 Ring goes out the protection device and method that branch connects transformer main electrical scheme into ring
CN108199355B (en) * 2018-02-06 2019-04-30 国网安徽省电力有限公司 Analysis electronic mutual inductor and electromagnetic transformer cooperate the method influenced on system protection
CN109546630B (en) * 2018-11-28 2019-12-27 华电电力科学研究院有限公司 10kV bus differential protection method based on intelligent substation process layer networking mode

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN101771268A (en) * 2008-12-29 2010-07-07 许继电气股份有限公司 Pilot protection method suitable for T-type wiring transmission line
CN101882779A (en) * 2010-07-21 2010-11-10 深圳市库马克新技术股份有限公司 High voltage converter with differential protection
CN101958530A (en) * 2010-10-26 2011-01-26 湖北白莲河抽水蓄能有限公司 Main transformer differential protection CT polarity check method of pumped storage power station
CN102104246A (en) * 2011-01-30 2011-06-22 武汉百叡电力技术有限公司 Method and device for reducing time limit combination step progression of distribution network relaying protection

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CN102629755B (en) * 2012-03-22 2014-12-03 中国电力科学研究院 Power transmission line backup protection method based on wide area information

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101771268A (en) * 2008-12-29 2010-07-07 许继电气股份有限公司 Pilot protection method suitable for T-type wiring transmission line
CN101882779A (en) * 2010-07-21 2010-11-10 深圳市库马克新技术股份有限公司 High voltage converter with differential protection
CN101958530A (en) * 2010-10-26 2011-01-26 湖北白莲河抽水蓄能有限公司 Main transformer differential protection CT polarity check method of pumped storage power station
CN102104246A (en) * 2011-01-30 2011-06-22 武汉百叡电力技术有限公司 Method and device for reducing time limit combination step progression of distribution network relaying protection

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