CN106655113A - Fault recognition and fault protection method of buscouple dead zone - Google Patents
Fault recognition and fault protection method of buscouple dead zone Download PDFInfo
- Publication number
- CN106655113A CN106655113A CN201611247449.3A CN201611247449A CN106655113A CN 106655113 A CN106655113 A CN 106655113A CN 201611247449 A CN201611247449 A CN 201611247449A CN 106655113 A CN106655113 A CN 106655113A
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- Prior art keywords
- female side
- current
- bus
- electric current
- dead zone
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a fault recognition and fault protection method of a buscouple dead zone. Whether a fault position is a buscouple dead zone fault or not is judged by detecting currents of mutual inductors at two sides of a buscouple circuit breaker, calculating the vector sum of the two currents and detecting whether the amplitude of the vector sum is larger than the amplitude of the current of an arbitrary mutual inductor. By the method, the buscouple dead zone fault can be accurately and effectively recognized; and compared with prior art, the method has the advantages that the relay protection selection requirement can be reflected better.
Description
Technical field
The invention belongs to the technical field that electric power system fault judges, and in particular to a kind of bus tie dead zone Fault Identification and event
Barrier guard method.
Background technology
At present, the common Main Wiring of power system includes single busbar, single mother partition, single female three segmentation, double mothers
Line, double female double points, single point of double mothers and 3/2nds modes of connection.For double-bus configuration system, mother transformer and mother open circuit
The failure occurred between device is referred to as dead-zone fault.
Chinese Magazines《Relay》The 10th phase of volume 34 is entitled, and " Busbar Protection dead-zone fault relay protective scheme grinds
Study carefully " paper disclose a kind of recognition methodss of bus tie dead zone failure, it is big poor by starting when breaking down, then gather female
The electric current of connection chopper both sides current transformer, when the amplitude that the amplitude of the current vector sum of two transformers is big difference
When, can determine that and there occurs bus tie dead zone failure.
As shown in figure 1, when N points occur dead-zone fault, difference big first starts, now the difference stream of big difference is certain value
Then the electric current of two current transformers is gathered, respectivelyWithWhen the electric current meetsWhen, judge mother
Dead-zone fault occurs.
This method solving conventional protection devices elder generation false tripping fault-free bus could recognize the problem of dead-zone fault, exist
Have the disadvantage that above-mentioned dead-zone fault decision condition has the possibility of failure, this is because transformer has measurement error, even if occurring
Bus tie dead zone failure, can also make above-mentioned judgement formula equal sign the right and left unequal, i.e.,Make decision condition
Dead-zone fault cannot effectively be recognized.The method failure after little difference still can false tripping fault-free bus, cause power failure range to expand, it is right
The reliability of power supply brings adverse effect.
The content of the invention
It is an object of the invention to provide a kind of bus tie dead zone fault recognition method, can not effectively know for solving prior art
The problem of other bus tie dead zone failure, also provides a kind of bus tie dead zone fault protecting method, can not be effective for solving prior art
The problem of identification bus tie dead zone failure.
To solve above-mentioned technical problem, the present invention proposes a kind of bus tie dead zone fault recognition method, including three identification sides
Method scheme：
Recognition methodss scheme one, comprises the following steps：
1) electric current of bus both sides current transformer is gathered, the electric current is designated as respectively 1 female side electric current, 2 female sides
Electric current；
2) when 1 female side electric current, 2 female side electric currents meet following condition, it is determined with the generation of bus tie dead zone failure：
1 female side electric current, 2 female side current vectors and amplitude and described 1 female side current amplitude difference more than setting
First threshold, or 1 female side electric current, 2 female side current vectors and amplitude be more than with the difference of described 2 female side current amplitudes
The Second Threshold of setting.
Recognition methodss scheme two, on the basis of recognition methodss scheme one, step 2) condition also includes：Described 1 is female
, more than the 3rd threshold value of setting, described 2 female side electric currents are more than the 4th threshold value for setting for side electric current.
Recognition methodss scheme three, on the basis of recognition methodss scheme two, the 3rd threshold value and the 4th threshold value are differential
Protection act definite value.
To solve above-mentioned technical problem, the present invention also proposes a kind of bus tie dead zone fault protecting method, including three protections
Method scheme：
Guard method scheme one, comprises the following steps：
1) electric current of bus both sides current transformer is gathered, the electric current is designated as respectively 1 female side electric current, 2 female sides
Electric current；
2) when 1 female side electric current, 2 female side electric currents meet following condition, it is determined with the generation of bus tie dead zone failure：
1 female side electric current, 2 female side current vectors and amplitude and described 1 female side current amplitude difference more than setting
First threshold, or 1 female side electric current, 2 female side current vectors and amplitude be more than with the difference of described 2 female side current amplitudes
The Second Threshold of setting；
3) bus is disconnected, the electric current of bus both sides current transformer does not charge to the little of each bus
Difference, by the little poor protective separation failure of each bus.
Guard method scheme two, on the basis of guard method scheme one, step 2) condition also includes：Described 1 is female
, more than the 3rd threshold value of setting, described 2 female side electric currents are more than the 4th threshold value for setting for side electric current.
Guard method scheme three, on the basis of guard method scheme two, the 3rd threshold value and the 4th threshold value are differential
Protection act definite value.
The invention has the beneficial effects as follows：By the electric current for detecting bus both sides transformer, two electric currents of calculating
Whether vector sum, according to the amplitude of vector sum the amplitude of any one transformer current is more than, and whether judges bus tie dead zone failure
Occur, the method accurate and effective can recognize bus tie dead zone failure, and hinge structure preferably embodies selectivity of relay protection
Requirement.
Description of the drawings
Fig. 1 is the double-bus electrical main connecting wire schematic diagram that double CT are accessed；
Fig. 2 is that the anti-error fault-free bus of cutting of bus tie dead zone failure differentiates flow chart.
Specific embodiment
The specific embodiment of the present invention is further described below in conjunction with the accompanying drawings.
A kind of embodiment of the bus tie dead zone fault recognition method of the present invention：
As shown in Fig. 2 being provided with current transformer in bus both sides, it is respectively used to monitoring bus and arrives
1 female and bus is recorded as respectively 1 female side electricity to the difference stream between 2 mothers, the electric current of two current transformers of Real-time Collection
Stream, 2 female side electric currents.Wherein 1 female side electric current correspondence bus is to the difference stream between 1 mother, 2 female side electric current correspondence mother open circuits
Device is to the difference stream between 2 mothers.
When 1 female side electric current, 2 female side current vectors and amplitude and described 1 female side current amplitude difference more than setting
First threshold, or when 1 female side electric current, 2 female side current vectors and amplitude and described 2 female side current amplitudes difference more than setting
Second Threshold when, can determine that bus tie dead zone failure, determining type is as follows：
Iadd-I1＞ In
Iadd-I2＞ Im
Wherein,Represent 1 female side current vector, I11 female side current amplitude is represented,Represent 2 female side current vectors, I2Table
Show 2 female side current amplitudes,Represent the sum of 1 female side current vector and 2 female side current vectors, IaddRepresent 1 female side current vector
With the amplitude of the sum of 2 female side current vectors, InRepresent the first threshold of setting, ImRepresent the Second Threshold of setting.
The bus tie dead zone fault recognition method of the present invention accurate and effective can recognize bus tie dead zone failure, solve bus poor
Dynamic protection is mistakenly considered bus tie dead zone failure the problem of bus-bar fault.
Electric current to prevent transformer from detecting causes the erroneous judgement that dead-zone fault is recognized when too small or unloaded, need to single
The size of current of current transformer electric current needs to make restriction, i.e., 1 female side electric current is more than the 3rd threshold value for setting, 2 female side electric currents
More than the 4th threshold value of setting, the 3rd threshold value and the 4th threshold value may be configured as differential protection action definite value, and determining type is as follows：
I1＞ Iset
I2＞ Iset
Wherein, IsetRepresent differential protection action definite value.
A kind of embodiment of the bus tie dead zone fault protecting method of the present invention：
As shown in Fig. 2 being provided with current transformer in bus both sides, it is respectively used to monitoring bus and arrives
1 female and bus is recorded as respectively 1 female side electricity to the difference stream between 2 mothers, the electric current of two current transformers of Real-time Collection
Stream, 2 female side electric currents.Wherein 1 female side electric current correspondence bus is to the difference stream between 1 mother, 2 female side electric current correspondence mother open circuits
Device is to the difference stream between 2 mothers.
When 1 female side electric current, 2 female side current vectors and amplitude and 1 female side current amplitude difference more than the first of setting
Threshold value, or when 1 female side electric current, 2 female side current vectors and amplitude and 2 female side current amplitudes difference more than setting the second threshold
During value, bus tie dead zone failure is can determine that, determining type is as follows：
Iadd-I1＞ In
Iadd-I2＞ Im
Wherein,Represent 1 female side current vector, I11 female side current amplitude is represented,Represent 2 female side current vectors, I2Table
Show 2 female side current amplitudes,Represent 1 female side current vector and 2 mother side current vectors and, IaddRepresent 1 female side current vector
With 2 female side current vectors and amplitude, InRepresent the first threshold of setting, ImRepresent the Second Threshold of setting.
After judging that bus tie dead zone failure occurs, need to release mother electric current, bus tie dead zone event is released by differential protection
Barrier.Specific way is instantaneously to jump bus, and locking bus differential protecting 100ms, 100ms time delays start bus after meeting
Differential protection, you can tripping fault bus, realizes effective identification and protection of bus tie dead zone failure, and will not false tripping fault-free mother
Line, that is, solve first be judged to bus-bar fault, restart false tripping fault bus caused by bus differential protecting during generation dead-zone fault
Problem, eliminates the adverse effect that false tripping fault-free bus is produced to power supply reliability.
Judge by accident during to prevent electric current too small or be unloaded, need the size of current to single current transformer current to need to do
Go out to limit, i.e., 1 female side electric current more than setting the 3rd threshold value, 2 female side electric currents more than setting the 4th threshold value, the 3rd threshold value and the
Four threshold values may be configured as differential protection action definite value, and determining type is as follows：
I1＞ Iset
I2＞ Iset
Wherein, IsetRepresent differential protection action definite value.
Above-described embodiment is the process that Real-time Collection bus both sides transformer current carries out error protection, used as changing
Enter, the situation of the big poor difference current of detection can also be passed through, when difference current meets following condition, gather chopper both sides
1 female side electric current, 2 female side electric currents：
Id＞ Iset
Id＞ kIr
Wherein, IdFor big poor difference current, the vector sum of the branch current for participating in differential current computing branch road is represented；IsetFor
Differential protection action definite value, represents the sum of the branch current absolute value for participating in differential current computing branch road；K is ratio brake coefficient, Ir
For stalling current.
The width of the sum of 1 female side current vector and 2 female side current vectors is asked in the present embodiment using all-round Fourier algorithm
Value, calculating formula is as follows：
Wherein, IaddRepresentThe amplitude of (1 female side current vector, the sum of 2 female side current vectors), ImRepresentMaximum
It is worth, T isCycle, ω isAngular frequency, θ representsFirst phase.
The present embodiment calculates respectively the amplitude of bus both sides transformer current using all-round Fourier algorithm, calculates
Formula is as follows：
Wherein, Im1RepresentMaximum, ω1RepresentAngular frequency, θ1RepresentFirst phase, T1RepresentCycle,
Im2RepresentMaximum, ω2RepresentAngular frequency, θ1RepresentFirst phase, T2RepresentCycle.
Under the thinking that the present invention is given, to above-mentioned enforcement by the way of being readily apparent that to those skilled in the art
Technological means in example enter line translation, replacement, modification, and play a part of and the basic phase of relevant art means in the present invention
Goal of the invention that is same, realizing is also essentially identical, and the technical scheme for so being formed is finely adjusted to be formed to above-described embodiment, this
Plant technical scheme to still fall within protection scope of the present invention.
Claims (6)
1. a kind of bus tie dead zone fault recognition method, it is characterised in that comprise the following steps：
1) electric current of bus both sides current transformer is gathered, the electric current is designated as respectively 1 female side electric current, 2 female side electric currents；
2) when 1 female side electric current, 2 female side electric currents meet following condition, it is determined with the generation of bus tie dead zone failure：
1 female side electric current, 2 female side current vectors and amplitude and described 1 female side current amplitude difference more than the of setting
One threshold value, or 1 female side electric current, 2 female side current vectors and amplitude and described 2 female side current amplitudes difference more than setting
Second Threshold.
2. bus tie dead zone fault recognition method according to claim 1, it is characterised in that step 2) condition also wraps
Include：Described 1 female side electric current is more than the 3rd threshold value for setting, fourth threshold value of the described 2 female side electric currents more than setting.
3. bus tie dead zone fault recognition method according to claim 2, it is characterised in that the 3rd threshold value and the 4th threshold
It is worth for differential protection action definite value.
4. a kind of bus tie dead zone fault protecting method, it is characterised in that comprise the following steps：
1) electric current of bus both sides current transformer is gathered, the electric current is designated as respectively 1 female side electric current, 2 female side electric currents；
2) when 1 female side electric current, 2 female side electric currents meet following condition, it is determined with the generation of bus tie dead zone failure：
1 female side electric current, 2 female side current vectors and amplitude and described 1 female side current amplitude difference more than the of setting
One threshold value, or 1 female side electric current, 2 female side current vectors and amplitude and described 2 female side current amplitudes difference more than setting
Second Threshold；
3) bus is disconnected, the electric current of bus both sides current transformer does not charge to the little difference of each bus, leads to
Cross the little poor protection act logic isolation failure of each bus.
5. bus tie dead zone fault protecting method according to claim 4, it is characterised in that step 2) condition also wraps
Include：Described 1 female side electric current is more than the 3rd threshold value for setting, fourth threshold value of the described 2 female side electric currents more than setting.
6. bus tie dead zone fault protecting method according to claim 5, it is characterised in that the 3rd threshold value and the 4th threshold
It is worth for differential protection action definite value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611247449.3A CN106655113B (en) | 2016-12-29 | 2016-12-29 | A kind of bus tie dead zone fault identification and fault protecting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611247449.3A CN106655113B (en) | 2016-12-29 | 2016-12-29 | A kind of bus tie dead zone fault identification and fault protecting method |
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| CN106655113A true CN106655113A (en) | 2017-05-10 |
| CN106655113B CN106655113B (en) | 2018-11-09 |
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Cited By (4)
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| CN108666989A (en) * | 2018-05-22 | 2018-10-16 | 南京南瑞继保电气有限公司 | A kind of differential protecting method and device applied to bus tie dead zone failure |
| CN108736455A (en) * | 2018-05-31 | 2018-11-02 | 国网河北省电力有限公司培训中心 | Protection simulation method and system |
| CN111668816A (en) * | 2020-05-14 | 2020-09-15 | 许昌许继软件技术有限公司 | Electronic transformer-based breaker dead zone fault processing method |
| CN112731240A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Ground fault positioning method applied to fault indicator |
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Cited By (4)
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| CN108666989A (en) * | 2018-05-22 | 2018-10-16 | 南京南瑞继保电气有限公司 | A kind of differential protecting method and device applied to bus tie dead zone failure |
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| CN111668816A (en) * | 2020-05-14 | 2020-09-15 | 许昌许继软件技术有限公司 | Electronic transformer-based breaker dead zone fault processing method |
| CN112731240A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Ground fault positioning method applied to fault indicator |
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| Publication number | Publication date |
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| CN106655113B (en) | 2018-11-09 |
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