CN106129971B - A kind of dual failure fault partition method of busbar protective device breaker and system - Google Patents
A kind of dual failure fault partition method of busbar protective device breaker and system Download PDFInfo
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- CN106129971B CN106129971B CN201610663556.8A CN201610663556A CN106129971B CN 106129971 B CN106129971 B CN 106129971B CN 201610663556 A CN201610663556 A CN 201610663556A CN 106129971 B CN106129971 B CN 106129971B
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- 230000001681 protective effect Effects 0.000 title claims abstract description 33
- 230000009977 dual effect Effects 0.000 title claims abstract description 28
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- 238000005192 partition Methods 0.000 title claims abstract description 14
- 230000004224 protection Effects 0.000 claims abstract description 51
- 230000004069 differentiation Effects 0.000 claims abstract description 7
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- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
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Abstract
The present invention relates to a kind of dual failure fault partition method of busbar protective device breaker and system, the present invention first determines whether busbar protective device acts and jumps main transformer branch；If it is, calculating the main transformer branch current and place busbar voltage, judge whether the condition for meeting main transformer branch breaker failure；It is greater than adjusting delay when a certain phase current of main transformer branch meets failure criterion and duration; the main transformer breaker fail protection acts three side of shunt tripping main transformer; because nearly standby tripping leads to the remote back-up protection of error starting when the present invention solves the problems, such as to occur breaker dual failure, to reduce damage of the failure to electrical equipment and effectively ensure the safe and stable operation of entire power grid.Furthermore the present invention carries out the differentiation of main transformer branch breaker failure in such a way that full-wave fourier algorithm and cosine difference algorithm combine, and influence of the CT current tail to breaker fail protection when effectively inhibiting failure removal improves protection act reliability.
Description
Technical field
The present invention relates to a kind of dual failure fault partition method of busbar protective device breaker and systems, belong to power train
System technical field of relay protection.
Background technique
Electric network composition is than comparatively dense at present, when outlet or main equipment failure point, as long as relay protection can be fast
Fast tripping circuit breaker isolated fault point, will not bring too much influence to the stable operation of whole system.But works as and bus occur
Occur main transformer high-pressure side breaker failure or line-breaker failure when line fault again when failure after busbar breaker failure
Occurs the dual failure situation of main transformer high-pressure side breaker failure again afterwards, if other side power supplys of main transformer are stronger, because without quickly protecting
Shield act isolated fault, it will to system, very big damage is especially caused to transformer, may cause it is more serious after
Fruit, especially when dead-zone fault occurs between main transformer high-pressure side breaker and CT, because fault bus where the main transformer of high-pressure side loses
Voltage is removed, high-pressure side zero-sequence voltage injection is ineffective, and the high-pressure side direction Fu Ya overcurrent may lost effect, and (voltage takes this side
When), at this point, failure can only be cut off without direction back-up protection by delay is longer, therefore will to the stable operation of system
It produces a very large impact.
Summary of the invention
The object of the present invention is to provide a kind of dual failure fault partition method of busbar protective device breaker and system, with
It solves the problems, such as when there is the dual failure of breaker because nearly standby tripping leads to the remote back-up protection of error starting.
The present invention provides a kind of dual failure fault isolation of busbar protective device breaker to solve above-mentioned technical problem
Method, the partition method the following steps are included:
1) judge whether busbar protective device acts and jump main transformer branch；
2) if it is, calculating the main transformer branch current and place busbar voltage, judge whether to meet main transformer branch circuit break
The condition of device failure；
3) when a certain phase current of main transformer branch meets failure criterion and the duration is greater than adjusting delay, the main transformer is disconnected
Road device failure protection acts three side of shunt tripping main transformer.
The deterministic process of main transformer branch breaker failure is as follows in step 2):
A. main transformer branch three-phase current and busbar voltage are calculated using full-wave fourier algorithm, when phase electricity any in three-phase current
Stream, which is greater than breaker fail protection phase current setting valve, zero negative current meets operation condition or meets low power factor differentiates item
Part, and busbar voltage meet composite voltage differentiate logic when, primarily determine the main transformer branch breaker failure；
B. the phase current to impose a condition in step A is met using the calculating of cosine difference algorithm, judges whether the phase current is big
In the current ration of setting, if so, determining the main transformer branch breaker failure.
Busbar voltage breaks without PT where main transformer branch, three-phase voltage is below setting value and three-phase has the condition of stream
Under, directly open low power factor differentiates that is, default meets low power factor criterion；The bus phase where main transformer branch
When voltage is more than or equal to setting value and the Xiang Youliu, starts phase low power factor differentiation, sentence if this mutually meets low power factor
Other condition, and busbar voltage meet composite voltage differentiate logic when, then primarily determine the main transformer branch breaker failure.
The low power factor criterion are as follows:
| cos Φ | < cos ΦZD
Wherein Φ is the phase angle aberration measurements of phase voltage and electric current, ΦZDMake threshold for device low power factor angular motion.
Step A median generatrix voltage meets composite voltage and differentiates that logic refers to that busbar voltage low-voltage is less than low-voltage definite value
Or zero negative voltage be greater than zero negative voltage definite value when.
The current ration I set in the step BsetFor 0.05In, InFor secondary current rated value.
The movement of step 1) bus protection is jumped main transformer branch and is referred to when bus-bar fault bus differential protecting acts or receives
Outside open failure open into mother failure protection movement or other breaker fail protections movement jump main transformer branch when.
The present invention also provides a kind of dual failure fault shielding system of busbar protective device breaker, the shielding system packets
It includes and jumps main transformer branch judgment module, main transformer branch breaker failure judgment module and execution module,
The jump main transformer branch judgment module jumps main transformer branch for judging whether busbar protective device acts；
The main transformer branch breaker failure judgment module is used to calculate main transformer branch current and place busbar voltage, and
Judge whether the condition for meeting main transformer branch breaker failure according to calculated result；
The execution module is used to judge that a certain phase current of main transformer branch is full in main transformer branch breaker failure judgment module
Sufficient failure criterion and duration are greater than adjusting delay, which acts three side of shunt tripping main transformer.
The main transformer branch breaker failure judgment module includes preliminary judgement unit and final determining unit,
The preliminary judgement unit calculates main transformer branch three-phase current and busbar voltage using full-wave fourier algorithm, works as three-phase
Any phase current is greater than breaker fail protection phase current setting valve in electric current, zero negative current meets operation condition or meets low
Power factor criterion, and busbar voltage meet composite voltage differentiate logic when, primarily determine the main transformer branch breaker lose
Spirit；
The final determining unit calculates the phase electricity for meeting and imposing a condition in preliminary judgement unit using cosine difference algorithm
Stream, judges whether the phase current is greater than the current ration of setting, if so, determining the main transformer branch breaker failure.
Jump main transformer branch judgment module, main transformer branch breaker failure judgment module and the execution module is placed on mother
In line protective device, run in breaker fail protection function investment.
The beneficial effects of the present invention are: the present invention, which first determines whether busbar protective device acts, jumps main transformer branch；If
It is then to calculate the main transformer branch current and place busbar voltage, judges whether the condition for meeting main transformer branch breaker failure；When
The a certain phase current of main transformer branch meets failure criterion and the duration is greater than adjusting delay, the main transformer breaker fail protection
Act three side of shunt tripping main transformer.It solves when there is the dual failure of breaker because nearly standby tripping leads to the remote back-up protection of error starting
Problem, to reduce damage of the failure to electrical equipment and effectively ensure the safe and stable operation of entire power grid.
The wherein side that the differentiation of main transformer branch breaker failure is combined using full-wave fourier algorithm and cosine difference algorithm
Formula, the main transformer branch three-phase current being calculated by full-wave fourier algorithm and busbar voltage primarily determine that the main transformer branch is disconnected
Road device whether failure；Meet the phase current to impose a condition in step A by the calculating of cosine difference algorithm, whether judges the phase current
Greater than the current ration of setting, if so, determining the main transformer branch breaker failure.The present invention utilizes conventional fourier algorithm and remaining
String difference algorithm "AND" logic, influence of the CT current tail to breaker fail protection when effectively inhibiting failure removal improve
Protection act reliability.
Detailed description of the invention
Fig. 1 is double bus scheme schematic diagram；
Fig. 2 is that the dual failure busbar protective device of breaker quickly cuts off fault method flow chart.
Specific embodiment
A specific embodiment of the invention is described further with reference to the accompanying drawing.
Occur main transformer breaker failure or line broken circuit when line fault again when bus-bar fault after busbar breaker failure
Occur the dual failure special circumstances of main transformer breaker failure again after device failure, when bus troubles inside the sample space occurs or receives outside
Open failure open it is fashionable, bus correlation protection act jump main transformer branch after, starting main transformer branch breaker failure differentiate logic；With
The raising of the voltage class and optimization electrical secondary system time constant of breaker actuation performance is increasing and failure adjusting delay
Shortening, the risk that failure protection error starting even malfunctions is increasing, and Given this present invention provides a kind of busbar protective device
The dual failure fault partition method of breaker, this method first determine whether busbar protective device acts and jump main transformer branch；If
It is then to calculate the main transformer branch current and place busbar voltage, judges whether the condition for meeting main transformer branch breaker failure；When
The a certain phase current of main transformer branch meets failure criterion and the duration is greater than adjusting delay, the main transformer breaker fail protection
Three side of shunt tripping main transformer is acted, to reduce damage of the failure to electrical equipment and effectively ensure the safe and stable operation of entire power grid.
It is illustrated by taking double-bus main wiring mode as an example below, double bus scheme schematic diagram is as shown in Figure 1, it is assumed that
3# branch and 4# branch are run on I mother, and 2# branch and 5# branch are run on II mother.Under following operating condition, if bus is protected
Not the case where shield configuration does not consider the dual failure of breaker, and when cutting off failure by remote back-up protection, it will to the stable operation of system
It produces a very large impact.
Operating condition 1: occurring K1 point failure, and 2# branch route protection act jumps the breaker (2DL) being connected with bus, if
For 2DL since operating mechanism failure and other reasons cause refusal to trip, then 2# branch breaker failure protection, which can act, jumps institute on II mother
There is branch, if 5# transformer branch breaker (5DL) also failure at this time, if bus protection does not consider this dual mistake when configuring
Spirit can not be cut off by busbar protective device failure.Operating condition 2: occurring K2 point failure, and I female differential protection movement, which is jumped on I mother, owns
Branch, i.e. jump 1# branch, 3# branch, 4# branch, if 1# mother branch breaker (1DL) is due to operating mechanism failure and other reasons
Cause refusal to trip, then mother failure protection can act jump whole station, if 5# transformer branch breaker (5DL) also failure at this time,
If bus protection does not consider this dual failure when configuring, can not be cut off by busbar protective device failure.Based on this, this hair
The bright the case where dual failure of breaker is considered when busbar protective device configures breaker fail protection, design busbar protective device
Quickly excision failure embodiment as shown in Fig. 2, this method specific step is as follows:
1. bus correlation protection act jumps main transformer branch, start main transformer branch breaker failure.
Bus correlation protection act jumps main transformer branch and refers to when the movement of bus-bar fault bus differential protecting or receive outer
Portion open failure open into mother failure protection movement or other breaker fail protections movement jump main transformer branch when.
2. judge main transformer branch breaker whether failure.
A. calculating current voltage, primarily determine main transformer branch breaker whether failure.
Main transformer branch A, B, C three-phase current and busbar voltage are calculated using conventional complete cycle Fu formula algorithm, when A, B, C three-phase electricity
It flows any phase current and is greater than breaker fail protection zero negative sequence electric current greater than breaker fail protection phase current definite value, zero negative current
Definite value perhaps meets low power factor criterion and busbar voltage low-voltage is less than low-voltage definite value or zero negative voltage is greater than
When zero negative voltage definite value, main transformer branch breaker failure is primarily determined.
Consider in branch three-phase fault and three-phase failure, there may be under-sensitives for zero-sequence current, negative-sequence current
Problem.When to prevent three-phase failure protection is because of tripping caused by electric current criterion, and design protection low power factor element, the element are adopted
With phase comparator algorithm.When bus phase voltage is more than or equal to setting value and the Xiang Youliu where main transformer branch, it is mutually low to start this
Power factor differentiation, criterion are as follows:
| cos Φ | < cos ΦZD
In formula: Φ is the phase angle aberration measurements of a phase voltage and electric current, ΦZDMake threshold for device low power factor angular motion,
70 ° are fixed as, i.e. low power factor element movement range is:
70 ° of 110 ° of < Φ <, 250 ° of 290 ° of < Φ <
When any phase voltage is lower than the 10V or Xiang Wuliu, phase low power factor judgement is exited.
In order to solve the sensitivity problem of doorway three-phase fault breaker three-phase failure, the busbar voltage where main transformer branch
No PT broken string, three-phase voltage are below setting value and (in the present embodiment for 10V) and under conditions of three-phase has stream, directly open low
Power factor differentiates that is, default meets low power factor criterion, only need to differentiate whether busbar voltage meets composite voltage and sentence
Other logic.
B. to electric current carry out sampling processing, inhibit failure removal when CT current tail influence: when electric current and composite voltage
When being all satisfied breaker failure operation condition, the main transformer branch is calculated using cosine difference algorithm and meets step A current condition
Phase current, when the phase current is greater than the current ration I of settingsetWhen, the main transformer branch breaker failure is determined, in the present embodiment
IsetFor 0.05In, InFor secondary current rated value.
3. three side of shunt tripping main transformer after adjusting delay.
It is greater than adjusting delay, main transformer breaker when a certain phase current of main transformer branch meets failure criterion and duration
Failure protection acts three side of shunt tripping main transformer.
The dual failure fault partition method of busbar protective device breaker of the invention can be used as an independent function mould
Block is placed in busbar protective device.For this purpose, the present invention also provides a kind of dual failure faults of busbar protective device breaker
Shielding system, including main transformer branch judgment module, main transformer branch breaker failure judgment module and execution module are jumped, jump main transformer branch
Road judgment module jumps main transformer branch for judging whether busbar protective device acts；Main transformer branch breaker failure judgment module is used
In calculating main transformer branch current and place busbar voltage, and judged whether to meet main transformer branch breaker failure according to calculated result
Condition；Execution module is used to judge that a certain phase current of main transformer branch meets failure in main transformer branch breaker failure judgment module
Criterion and duration are greater than adjusting delay, which acts three side of shunt tripping main transformer.Each module
Specific implementation means are described in detail in the example of method, and which is not described herein again.
The system is run when breaker fail protection function is put into, and utilizes conventional fourier algorithm and cosine difference algorithm
"AND" Logical filtering, influence of the CT current tail to failure protection, improves failure protection when effectively inhibiting failure removal
Reliability of Microprocessor.And in the dual failure of generation breaker, the protection of bus breaker is as the adjacent open circuit of nearly standby faster trip
Device isolated fault ensure that the safe and stable operation of system.
What embodiments above was only used for side understands core of the invention thought, and the present invention cannot be limited in this way, for this
The technical staff in field, it is all according to the thought of the present invention, modify to the present invention or replace on an equal basis, in specific embodiment party
Any change done in formula and application range, should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of dual failure fault partition method of busbar protective device breaker, which is characterized in that the partition method include with
Lower step:
1) judge whether busbar protective device acts and jump main transformer branch；
2) if it is, calculating the main transformer branch current and place busbar voltage, judge whether to meet the mistake of main transformer branch breaker
The condition of spirit；
3) when a certain phase current of main transformer branch meets failure criterion and the duration is greater than adjusting delay, the main transformer breaker
Failure protection acts three side of shunt tripping main transformer；
The deterministic process of main transformer branch breaker failure is as follows in step 2):
A. main transformer branch three-phase current and busbar voltage are calculated using full-wave fourier algorithm, when phase current any in three-phase current is big
Meet operation condition in breaker fail protection phase current setting valve, zero negative current or meet low power factor criterion,
And busbar voltage meet composite voltage differentiate logic when, primarily determine the main transformer branch breaker failure；
B. the phase current to impose a condition in step A is met using the calculating of cosine difference algorithm, judges whether the phase current is greater than and sets
Fixed current ration, if so, determining the main transformer branch breaker failure；
Step A median generatrix voltage meet composite voltage differentiate logic refer to busbar voltage low-voltage be less than low-voltage definite value or
When zero negative voltage is greater than zero negative voltage definite value.
2. the dual failure fault partition method of busbar protective device breaker according to claim 1, which is characterized in that when
Busbar voltage where main transformer branch without PT broken string, three-phase voltage is below setting value and under conditions of three-phase has stream, directly opens
Power factor differentiation is lowerd, i.e. default meets low power factor criterion；The bus phase voltage where main transformer branch is greater than
When equal to setting value and the Xiang Youliu, start phase low power factor differentiation, if this mutually meets low power factor criterion, and
When busbar voltage meets composite voltage differentiation logic, then the main transformer branch breaker failure is primarily determined.
3. the dual failure fault partition method of busbar protective device breaker according to claim 2, which is characterized in that institute
The low power factor criterion stated are as follows:
| cos Φ | < cos ΦZD
Wherein Φ is the phase angle aberration measurements of phase voltage and electric current, ΦZDMake threshold for device low power factor angular motion.
4. the dual failure fault partition method of busbar protective device breaker according to claim 1, which is characterized in that institute
State the current ration I set in step BsetFor 0.05In, InFor secondary current rated value.
5. the dual failure fault partition method of busbar protective device breaker according to claim 1, which is characterized in that step
Rapid 1) bus protection movement jumps main transformer branch and refers to opening failure when bus-bar fault bus differential protecting acts or receives outside
When opening into the movement of mother failure protection or other breaker fail protections movement jump main transformer branch.
6. a kind of dual failure fault shielding system of busbar protective device breaker, which is characterized in that the shielding system includes jumping
Main transformer branch judgment module, main transformer branch breaker failure judgment module and execution module,
The jump main transformer branch judgment module jumps main transformer branch for judging whether busbar protective device acts；
The main transformer branch breaker failure judgment module for calculating main transformer branch current and place busbar voltage, and according to
Calculated result judges whether the condition for meeting main transformer branch breaker failure；
The execution module is used to judge that a certain phase current of main transformer branch meets in main transformer branch breaker failure judgment module to lose
Clever criterion and duration are greater than adjusting delay, which acts three side of shunt tripping main transformer；
The main transformer branch breaker failure judgment module includes preliminary judgement unit and final determining unit,
The preliminary judgement unit calculates main transformer branch three-phase current and busbar voltage using full-wave fourier algorithm, works as three-phase current
In any phase current be greater than breaker fail protection phase current setting valve, zero negative current and meet operation condition or meet low-power
Factor criterion, and busbar voltage meet composite voltage differentiate logic when, primarily determine the main transformer branch breaker failure；
The final determining unit meets the phase current to impose a condition in preliminary judgement unit using the calculating of cosine difference algorithm, sentences
Whether the phase current that breaks is greater than the current ration of setting, if so, determining the main transformer branch breaker failure；
Busbar voltage meets composite voltage and differentiates that logic refers to that busbar voltage low-voltage is less than low-voltage definite value or zero negative electricity
When pressure is greater than zero negative voltage definite value.
7. the dual failure fault shielding system of busbar protective device breaker according to claim 6, which is characterized in that institute
Jump main transformer branch judgment module, main transformer branch breaker failure judgment module and the execution module stated are placed on busbar protective device
In, it is run in breaker fail protection function investment.
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| CN112736870B (en) * | 2020-12-24 | 2022-03-29 | 华中科技大学 | Adjacent cooperative remote backup protection method |
| CN114389239B (en) * | 2021-12-21 | 2024-04-26 | 国电南瑞科技股份有限公司 | Bus protection voltage judging method and device of hand-in-hand wiring mode and storage medium |
| CN115308535B (en) * | 2022-09-20 | 2023-07-11 | 国网江苏省电力有限公司镇江供电分公司 | 220kV bus fault discrimination method based on monitoring information eventing system |
| CN116599005A (en) * | 2023-05-04 | 2023-08-15 | 天津大学 | Secondary acceleration fault isolation method after direct current breaker failure |
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