CN109802359A - It is a kind of to prevent from damaging the relay protecting method of transformer because of breaker flashover - Google Patents
It is a kind of to prevent from damaging the relay protecting method of transformer because of breaker flashover Download PDFInfo
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- CN109802359A CN109802359A CN201910168425.6A CN201910168425A CN109802359A CN 109802359 A CN109802359 A CN 109802359A CN 201910168425 A CN201910168425 A CN 201910168425A CN 109802359 A CN109802359 A CN 109802359A
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Abstract
It prevents from damaging the relay protecting method of transformer because of breaker flashover the invention discloses a kind of.All circuit breakers of the breaker of flashover occur in tripping for this method protection act, do not start breaker fail protection.The guard method is suitable for the protection of the grid-connected breaker of high voltage side of transformer of the generator-transformer group of no generator terminal breaker, and protection act delay takes 100ms, guarantees all circuit breakers of the breaker of tripping generation flashover in 250ms.Existing guard method, the delay for starting to failure protection outlet from breaker arc protection is generally longer, often results in the damage of transformer.The present invention has merged breaker protection and tranformer protection; after breaker flashover; all circuit breakers of direct tripping; realize the isolated fault in 250ms; avoid the expansion of fault coverage; guarantee that transformer is not damaged, the present invention obtains national standard " the 5th part of GB1094.5-2008 power transformer: bearing the ability of short circuit " theoretical and test support, there is very big application value.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System fields, and in particular to one kind prevents from becoming because breaker flashover damages
The relay protecting method of depressor.
Background technique
During generator-transformer group is grid-connected by step-up transformer high-pressure side breaker, on breaker fracture
Voltage difference between the system voltage and transformer unit floating voltage of fracture two sides angular difference change and constantly change, when certain phase
When angular difference is 180 °, fracture two sides just will appear the voltage difference of 2 times of working voltages.At this point, if circuit breaker internal insulation is deposited
There is filth in defect or exterior insulation, all easily development is breaker flashover fault.Domestic some power plant are because when putting into operation
Between longer (15 years or more), there are ageing equipment, breaker insulate partial failure the problem of, therefore the feelings of breaker flashover occur
Condition greatly increases.
Breaker arcing fault needs to be cut off by breaker arc protection.The operation condition of breaker arc protection
It is that breaker is in open position, and has negative-sequence current appearance, this point in industry gets the nod.But for dodging
There is also more disputes for the actuation time of network protection and manner of execution.Currently, the method generallyd use is according to " large-scale generator
Transformer relay protecting adaptive setting directive/guide ", i.e., when generator terminal does not have breaker, movement starts breaker failure in demagnetization simultaneously
Protection.
According to generator classical theory, after eliminating magnetism of generator, even if magnetic field field circuit breaker disconnects in time, since excitation is returned
The influence of the inductance on road, generator excitation circuit have the surge voltage of an opposite direction in field circuit breaker breaking moment, number
Value can reach the rated value of several times when maximum.The electric current exists in energized circuit, continues to the voltage of stator, and can continue
Several seconds.Therefore, after flashover generation occurs for breaker, according to existing arc protection method, even if arc protection is dynamic
Make, act in demagnetization, but because generator terminal voltage will not disappear immediately, fault current still can also exist, malfunction
Do not improve.
At this point, breaker arcing fault can only be cut off by breaker fail protection.And for the time limit of failure protection,
DL/T559-2007 " 220kV~750kV grid relay protective apparatus operation adjusting regulation " 7.2.10.2 item regulation, " in double mothers
Under the line mode of connection, to be acted in mother or section switch, (about with the longer time limit compared with short duration (about 250~350ms)
500ms) movement is connected to all breakers on same bus with tripping breaker in disconnection；In 3/2 breaker connection mode
Under, a directly time limit (about 200~500ms) this breaker three-phase and all breakers relevant to tripping breaker can be jumped,
Breaker including disconnecting opposite side through circuit.It can also be through acting compared with short duration (about 130~150ms) in this side breaker three of jump
Phase, through long period (about 200~250ms) tripping all breakers associated with tripping breaker, including through transfer trip
The line-breaker of channel disconnection opposite side ".
It is exactly the sum of the delay that failure protection exports to be started to from breaker arc protection, for double bus scheme side
Formula, tripping mother or the range in section switch time limit are about 350~450ms, on this side bus of tripping when all breakers
The range of limit is about 500~600ms.For 3/2 breaker connection mode, a kind of set-up mode time limit range is 300~
700ms jumps this breaker three-phase and all breakers relevant to tripping breaker.Another set-up mode time limit range is about
230~350ms, movement is in this side breaker three-phase of jump；In 300~450ms, tripping is associated with tripping breaker all disconnected
Road device.
The setting in these time limits, it is either any, failure protection tripping relative breaker is started to from arc protection, when
Limit is above 250ms.And according to the regulation of GB1094.5-2008 " the 5th part of power transformer: bearing the ability of short circuit ", hold
Amount in 2500kVA or more transformer, answered when short circuit delay is no more than 250ms it is not damaged, i.e., if duration of fault is more than
250ms is then likely to result in transformer damage.Also, for arcing fault, because fracture two sides voltage-phase is on the contrary, flow through
Short circuit current when 2 times of two sides power supplys of electric current of transformer are same-phase can be brought to transformer huge in a short time
Damage.
Flashover occurs for about 9s after Jiangsu Province's power generators in 2012 and system sectionalizing, main transformer high side switch A phase,
Cause to discharge over the ground, because current attenuation returns again after arc protection movement, after acting for second of arc protection, start failure protection
Protection, but because failure protection is longer because being delayed, lead to accident sustainable development, main transformer high-pressure side A phase switchs after being eventually until 1.6s
Explosion just leads to the complete blow-out in fault point.
Breaker arcing fault occurs for 2502 breaker C phase of the Power Plant No.2 main transformer high-pressure side of Jiangsu Province in 2014, and flashover is protected
340ms after shield failure, transformer winding unstability, deformation, then occurs short circuit grounding, eventually leads in 379ms, transformer differential
Fast tripping protection, the protection of main transformer grave gas, the movement of main transformer pressure release guard.
Breaker arcing fault occurs for the 5013 breaker B phases of string of power plant, Guizhou Province booster stations first within 2014, and flashover is protected
It protects after failure because catastrophe failure, the movement of 507ms main transformer grave gas, 572ms transform er differential protection, main transformer differential occur inside main transformer
Fast tripping protection movement.
For the deficiency of existing breaker arc protection method, it is necessary to propose some improvement projects or optimization method, protect
Card can quickly isolate or cut off the arcing fault of breaker, in case fault current damage transformer causes huge economic loss.
Summary of the invention
It is an object of the invention to be directed to the deficiency of existing breaker arc protection method, providing one kind is prevented because of open circuit
Device flashover damages the relay protecting method of transformer, for guaranteeing the arcing fault of the isolation circuit breakers in 250ms, in order to avoid therefore
Barrier circuit damage transformer causes huge economic loss.
In order to achieve the above objectives, the present invention is realized by following technical proposals:
It is a kind of to prevent from damaging the relay protecting method of transformer because of breaker flashover, comprising the following steps:
1) electric current of institute's protective breaker is flowed through in protective device acquisition, its negative-sequence current I is calculated2；
2) when protective device meets the following conditions, arc protection starting；
(1) breaker arc protection hard pressing plate is put into；
(2) breaker arc protection soft pressing plate is put into；
(3) control word set is moved back in arc protection throwing；
(4) circuit breaker position is in quartile；
(5) negative-sequence current I2Greater than arc protection current ration threshold；
3) when arc protection starting, and pass through delay time t, arc protection movement outlet；
4) arc protection movement does not start breaker fail protection in all circuit breakers of tripping stoppage circuit breaker.
A further improvement of the present invention lies in that the delay time t takes 100ms in step 3), reliably guarantee in breaker
All adjacent breakers of tripping in 250ms after generation arcing fault.
A further improvement of the present invention lies in that this method is suitable for the generator-transformer group of no generator terminal breaker
The protection of the grid-connected breaker of high voltage side of transformer.
A further improvement of the present invention lies in that all circuit breakers of protection act tripping include that eliminating magnetism of generator is opened
It closes.
A further improvement of the present invention lies in that for the generator-transformer group grid-connected using double-bus pattern, protection is dynamic
All circuit breakers for making to trip include all breakers where generator-transformer group on bus.
A further improvement of the present invention lies in that generator-the transformation grid-connected for the middle breaker using 3/2 wiring patterns
Device group, all circuit breakers of protection act tripping include two side breakers where middle breaker on string.
A further improvement of the present invention lies in that generator-the transformation grid-connected for the side breaker using 3/2 wiring patterns
Device group, all circuit breakers of protection act tripping include middle breaker where the breaker on string and while breaker institute
All breakers on bus.
The present invention has following beneficial technical effect:
1, the method for the present invention is suitable for breaker arc protection, wherein the outlet mode protected is different from traditional protection side
Method skips the process of starting breaker fail protection that is, after arc protection acts, and the breaker of flashover occurs for direct tripping
Circuit breakers avoid transformer damage to realize quickly (in 250ms) isolated fault.
2, what the method for the present invention was not isolated treats the protection that breaker arc protection is exactly breaker body, has mixed together open circuit
Device protection and tranformer protection, and obtain national standard and " the 5th part of GB1094.5-2008 power transformer: bear the energy of short circuit
Power " theoretical and test support, there is very big application value.
The present invention, which compares prior art, has following remarkable advantage:
1, for breaker arc protection, existing way is according to " large-sized generator and transformer relay protection setting meter
Calculate directive/guide ", i.e., when generator terminal does not have breaker, movement starts breaker fail protection in demagnetization simultaneously.This guard method is neglected
After eliminating magnetism of generator, due to the influence of energized circuit inductance, exciting current decaying is slower, and generator unit stator can last for several seconds
Clock, fault current can also always exist, and malfunction does not improve.At this point, breaker arcing fault can only lean on breaker failure
Protection is to cut off.But it is generally longer to start to the delay that failure protection exports from breaker arc protection.In this process
In, the flashover current sustainable development of breaker not only causes the damage for being difficult to repair to breaker body, and transformer also can be huge
Stabilization is lost under big electric power, is deformed, it is then short-circuit.Duration is longer, caused by damage it is also bigger.The present invention
The outlet mode of method protection is different from traditional protection method, i.e., after arc protection acts, skips starting breaker failure and protect
The circuit breakers of the breaker of flashover occur for the process of shield, direct tripping, thus realize quickly (in 250ms) isolated fault,
Avoid transformer damage.
2, what the method for the present invention was not isolated treats the protection that breaker arc protection is exactly breaker body, has merged open circuit
Device protection and tranformer protection, and obtain national standard and " the 5th part of GB1094.5-2008 power transformer: bear the energy of short circuit
Power " theoretical and test support, there is very big application value.
Detailed description of the invention
Fig. 1 is the relay protective scheme figure of the method for the present invention.
Fig. 2 is the generator-transformer group schematic diagram grid-connected using double-bus pattern.
Fig. 3 is the generator-transformer group schematic diagram grid-connected using 3/2 wiring patterns.
Symbol description is as follows in Fig. 1:
& indicates logical AND relationship, i.e., when its input condition all meets, output is effective.
T indicates delay time t milliseconds.
Specific embodiment
The present invention is made further instructions below in conjunction with attached drawing.
As shown in Figure 1, it is provided by the invention it is a kind of prevent because breaker flashover damage transformer relay protecting method, tool
Body process is as follows:
1, protective device judges whether breaker arc protection hard pressing plate puts into.
2, protective device judges whether breaker arc protection soft pressing plate puts into.
3, protective device judge flashover throwing move back control word whether set.
4, protective device judges whether circuit breaker position is in quartile.
5, when 1,2,3,4 steps all meet, protective device, which is collected, acts item by the negative-sequence current satisfaction of breaker
Part, then breaker arc protection starts.
6, by delay t one small movement outlet, this is delayed sets by escaping the breaker unbalanced three-phase lines time protective device
It is fixed, it can use 100ms.
7, protective device outlet mode is to jump all adjacent switches, because of high-voltage circuitbreaker and degaussing switch actuation time
It is minimum, it is certain to meet the requirement for being less than 50ms, to guarantee that total delay from breaker flashover to failure removal is no more than country
The 250ms that standard " the 5th part of GB1094.5-2008 power transformer: bearing the ability of short circuit " requires.
8, for the generator-transformer group grid-connected using double-bus pattern, as shown in Fig. 2, 1 is busbar breaker, 2 are
Transformer, 3 be generator, and 4 be degaussing switch, and 5 be the first breaker, and 6 be the second breaker, if grid-connected first breaker 5
Flashover occurs, all circuit breakers of protective device outlet tripping should include degaussing switch 4, first the 5, second open circuit of breaker
Device 6 and busbar breaker 1.
9, the generator-transformer group grid-connected for the middle breaker using 3/2 wiring patterns, as shown in figure 3,7-10 points
Not Wei third to the 6th breaker, generator-transformer group is grid-connected using third breaker 7, if third breaker 7 dodges
All circuit breakers of network, protective device outlet tripping should include degaussing switch 4, the first breaker 5 and the 5th breaker 9.
10, the generator-transformer group grid-connected for the side breaker using 3/2 wiring patterns, as shown in figure 3, power generation
Machine-transformer group is grid-connected using the 5th open circuit 9, if flashover occurs for the 5th open circuit 9, protective device exports all adjacent of tripping
Breaker should include degaussing switch 4, third breaker 7 and the 6th breaker 10.
Claims (7)
1. a kind of prevent from damaging the relay protecting method of transformer because of breaker flashover, which comprises the following steps:
1) electric current of institute's protective breaker is flowed through in protective device acquisition, its negative-sequence current I is calculated2；
2) when protective device meets the following conditions, arc protection starting；
(1) breaker arc protection hard pressing plate is put into；
(2) breaker arc protection soft pressing plate is put into；
(3) control word set is moved back in arc protection throwing；
(4) circuit breaker position is in quartile；
(5) negative-sequence current I2Greater than arc protection current ration threshold；
3) when arc protection starting, and pass through delay time t, arc protection movement outlet；
4) arc protection movement does not start breaker fail protection in all circuit breakers of tripping stoppage circuit breaker.
2. it is according to claim 1 it is a kind of prevent because breaker flashover damage transformer relay protecting method, feature
It is, in step 3), the delay time t takes 100ms, reliably guarantees that tripping in 250ms after arcing fault occurs in breaker
All adjacent breakers.
3. it is according to claim 1 it is a kind of prevent because breaker flashover damage transformer relay protecting method, feature
It is, this method is suitable for the guarantor of the grid-connected breaker of high voltage side of transformer of the generator-transformer group of no generator terminal breaker
Shield.
4. it is according to claim 1 it is a kind of prevent because breaker flashover damage transformer relay protecting method, feature
It is, in step 4), all circuit breakers of protection act tripping include eliminating magnetism of generator switch.
5. it is according to claim 1 it is a kind of prevent because breaker flashover damage transformer relay protecting method, feature
It is, the generator-transformer group grid-connected for use double-bus pattern, in step 4), protection act trips all adjacent
Breaker includes all breakers where generator-transformer group on bus.
6. it is according to claim 1 it is a kind of prevent because breaker flashover damage transformer relay protecting method, feature
It is, the generator-transformer group grid-connected for the middle breaker using 3/2 wiring patterns, in step 4), protection act tripping
All circuit breakers include two side breakers where middle breaker on string.
7. it is according to claim 1 it is a kind of prevent because breaker flashover damage transformer relay protecting method, feature
It is, the generator-transformer group grid-connected for the side breaker using 3/2 wiring patterns, in step 4), protection act tripping
All circuit breakers include middle breaker where the breaker on string and while it is all disconnected on bus where breaker
Road device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910168425.6A CN109802359B (en) | 2019-03-06 | 2019-03-06 | Relay protection method for preventing damage to transformer due to flashover of circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910168425.6A CN109802359B (en) | 2019-03-06 | 2019-03-06 | Relay protection method for preventing damage to transformer due to flashover of circuit breaker |
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| CN109802359A true CN109802359A (en) | 2019-05-24 |
| CN109802359B CN109802359B (en) | 2019-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993944A (en) * | 2021-02-05 | 2021-06-18 | 西安热工研究院有限公司 | Flashover protection method for grid-connected circuit breaker of generator transformer bank |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269824A (en) * | 2014-09-19 | 2015-01-07 | 国家电网公司 | Fault judgment method and backup protection method for medium-voltage side dead zone in main transformer |
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2019
- 2019-03-06 CN CN201910168425.6A patent/CN109802359B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269824A (en) * | 2014-09-19 | 2015-01-07 | 国家电网公司 | Fault judgment method and backup protection method for medium-voltage side dead zone in main transformer |
Non-Patent Citations (1)
| Title |
|---|
| 龙军: "断口闪络保护设计与应用探讨", 《电力建设》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993944A (en) * | 2021-02-05 | 2021-06-18 | 西安热工研究院有限公司 | Flashover protection method for grid-connected circuit breaker of generator transformer bank |
| CN112993944B (en) * | 2021-02-05 | 2022-10-21 | 西安热工研究院有限公司 | Flashover protection method for grid-connected circuit breaker of generator transformer bank |
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| CN109802359B (en) | 2019-12-10 |
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Effective date of registration: 20191115 Address after: 710032 Shaanxi province Xi'an Beilin District Xingqing Road No. 136 Applicant after: Xi'an Thermal Power Research Institute Co., Ltd. Applicant after: Huaneng Group Technology Innovation Center Co., Ltd. Address before: 710032 No. 136, Xingqing Road, Xi'an, Shaanxi Applicant before: Xi'an Thermal Power Research Institute Co., Ltd. |
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