CN109103848A - A kind of system and method for generator injected type ground protection conk-out protection - Google Patents
A kind of system and method for generator injected type ground protection conk-out protection Download PDFInfo
- Publication number
- CN109103848A CN109103848A CN201811191246.6A CN201811191246A CN109103848A CN 109103848 A CN109103848 A CN 109103848A CN 201811191246 A CN201811191246 A CN 201811191246A CN 109103848 A CN109103848 A CN 109103848A
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- Prior art keywords
- generator
- protection
- type ground
- conk
- injected type
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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
- H02H7/06—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 dynamo-electric generators; for synchronous capacitors
Abstract
A kind of system and method for generator injected type ground protection conk-out protection of the present invention, which includes main transformer, bus, overhead line etc.；Generator passes through generator generator terminal current transformer and is connected through enclosed busbar with main transformer low-pressure side, and first group of main transformer high-pressure side overhead line is connect with grid-connected breaker one end, and the grid-connected breaker other end is connect through second group of overhead line with bus.The method comprising the steps of: starting the movement of generator injected type ground protection and conk-out simultaneously is protected；Judge that generator generator terminal current transformer collects three-phase electricity flow valuve more than or equal to electric current threshold value, if judging result is "Yes", if continuing the step judging result after delay 150ms is "No", it was demonstrated that the tripping of grid-connected breaker then enters lower step；It is latched the movement of generator injected type ground protection.The present invention solve the problems, such as generator injected type ground protection can not conk-out protection, have the advantages that outlet mode rationally, differentiation it is accurate, adaptable.
Description
Technical field
The invention belongs to technical field of relay protection more particularly to a kind of generator injected type ground protection conk-out to protect
The system and method for shield.
Background technique
Generator injected type ground protection is the protection for reacting generator unit stator (or rotor) ground fault.Generator
Pouring-in ground protection principle is that auxiliary power unit provides additional low-frequency power, by injecting low-frequency voltage, current signal
Into generator unit stator (or rotor) winding, then by low-frequency voltage, the current signal of protective device detection injection.When generator is fixed
When ground fault occurs for sub (or rotor) winding, low-frequency voltage, the current signal of injection also change therewith, and protective device is logical
Cross node-pair method to collect low-frequency voltage, current signal calculates, if grounding resistance be lower than ground resistance criterion, i.e.,
Assert that generator unit stator (or rotor) winding is grounded, the movement of generator injected type ground protection.
Under normal conditions, generator stator ground protection act outlet mode is all to jump generator (or transformer unit) master to open
It closes, and starting circuit breaker failure protection, but generator injected type ground protection movement outlet mode fail to start breaker loses
Spirit protection.Due to generator injected type ground protection movement after, no matter generator (or transformer unit) main switch whether tripping, injection
Low-frequency voltage, current signal in generator unit stator (or rotor) winding still have, and lead to generator injected type ground protection
One direct acting, and then increase the risk that breaker fail protection accidentally starts.Existing generator injected type ground protection movement
The following defects and deficiencies exist for outlet:
(1) movement outlet mode is unreasonable.If existing generator injected type ground protection movement outlet starting circuit breaker
Failure protection increases the risk that breaker fail protection accidentally starts due to generator injected type ground protection one direct acting of meeting；
(2) increase equipment damaged risk.If existing generator injected type ground protection movement exports inoperative breaker
Failure protection will lead to primary equipment if failure situation occurs in breaker and be badly damaged.
Summary of the invention
The present invention for existing generator injected type ground protection movement after can not starting circuit breaker failure protection deficiency,
A kind of system and method for generator injected type ground protection conk-out protection is provided, it is suitable for generator injected types to connect
Ground protection, improve can not starting circuit breaker failure protection defect, have without it is additional increase primary equipment, outlet mode closes
The features such as reason.
The present invention adopts the following technical scheme that realize:
A kind of system of generator injected type ground protection conk-out protection, including generator generator terminal mutual inductor, main transformer
Depressor, grid-connected breaker, bus, enclosed busbar, first group of overhead line and second group of overhead line；Wherein,
Generator passes through generator generator terminal current transformer and is connected through enclosed busbar with main transformer low-pressure side, main transformer pressure
First group of device high-pressure side overhead line is connect with grid-connected breaker one end, and the grid-connected breaker other end is through second group of overhead line and mother
Line connection.
A further improvement of the present invention lies in that when work, generator, generator generator terminal current transformer, main transformer, simultaneously
When net breaker and bus are run, when the movement of generator injected type ground protection and the protection of conk-out simultaneously, generator machine
End current transformer collects three-phase electricity flow valuve more than or equal to electric current threshold value, continues to judge generator generator terminal after the 150ms that is delayed
Current transformer collects whether three-phase electricity flow valuve is less than electric current threshold value.
A further improvement of the present invention lies in that when work, generator, generator generator terminal current transformer, main transformer, simultaneously
When net breaker and bus are run, when the movement of generator injected type ground protection and the protection of conk-out simultaneously, generator machine
End current transformer collects three-phase electricity flow valuve less than electric current threshold value, locking generator injected type ground protection movement.
A kind of method of generator injected type ground protection conk-out protection, this method are based on a kind of above-mentioned generator note
The system for entering formula ground protection conk-out protection, includes the following steps:
Step S101, starts the movement of generator injected type ground protection and conk-out simultaneously is protected, and enters in next step
Suddenly；
Step S102 judges that generator generator terminal current transformer collects three-phase electricity flow valuve and is more than or equal to electric current threshold value,
If judging result is "Yes", continue step S102 after the 150ms that is delayed, if judging result is "No", it was demonstrated that grid-connected breaker
Tripping then enters step S103；
Step S103, locking generator injected type ground protection movement.
The present invention has following beneficial technical effect:
1, outlet mode is reasonable.The present invention judges grid-connected breaker as assistant criteria using generator generator terminal current value
Whether tripping, so that generator injected type ground protection can be with starting circuit breaker failure protection, protection exit mode is reasonable.
2, adaptable.The present invention is practical, without increasing primary equipment, is suitable for all protective relaying devices.
3, differentiate that result is accurate.The present invention uses reliable method of discrimination, to differentiate the state of grid-connected breaker, so as to
Accurately judge grid-connected breaker whether failure.
In conclusion the present invention solve the problems, such as generator injected type ground protection can not conk-out protection, use
Generator generator terminal current value judges whether grid-connected breaker reliably separates as criterion, to determine whether to be latched generator injection
The movement of formula ground protection has the advantages that outlet mode is reasonable, it is accurate, adaptable to differentiate.
Detailed description of the invention
Fig. 1 is main electrical scheme functional block diagram of the present invention.
Fig. 2 is that generator start and stop of the present invention protection automatically engages flow chart.
In figure: 1- generator；2- generator generator terminal current transformer；3- main transformer；The grid-connected breaker of 4-；5- bus；
6- enclosed busbar；First group of overhead line of 7-；Second group of overhead line of 8-.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
As shown in Figure 1, a kind of system of generator injected type ground protection conk-out protection provided by the invention, including
6, first groups of generator 1, generator generator terminal current transformer 2, main transformer 3, grid-connected breaker 4, bus 5, enclosed busbar framves
Ceases to be busy 7 and second group of overhead line 8.
Wherein, generator 1 passes through generator generator terminal current transformer 2 and is connected with 3 low-pressure side of main transformer, main transformer
3 first group of high-pressure side overhead lines 7 are connect with grid-connected 4 one end of breaker, and grid-connected 4 other end of breaker is through second group of overhead line 8
It is connect with bus 5.
When work, the generator 1, generator generator terminal current transformer 2, main transformer 3, grid-connected breaker 4 and bus 5
When normal operation, when generator injected type ground protection act, generator generator terminal current transformer 2 collect current value be greater than etc.
Judge that generator generator terminal current transformer 2 collects whether three-phase electricity flow valuve is more than or equal to door again after threshold value, the 150ms that is delayed
Threshold value.
Alternatively, the generator 1, generator generator terminal current transformer 2, main transformer 3, grid-connected breaker 4 and bus 5 are just
Often when operation, when generator injected type ground protection acts, generator generator terminal current transformer 2 collects current value less than electric current
Threshold value, locking generator injected type ground protection movement.
As depicted in figs. 1 and 2, the side of a kind of generator injected type ground protection conk-out protection provided by the invention
Method includes the following steps:
Step S101 starts the movement of generator injected type ground protection and simultaneously starting circuit breaker failure protection, and enters
Next step；
Step S102 judges that generator generator terminal current transformer 2 collects whether three-phase electricity flow valuve is more than or equal to electric current door
Threshold value, if judging result is "Yes", delay 150ms continues step S102；If judging result is "No", it was demonstrated that grid-connected open circuit
The tripping of device 4, enters step S103；
Step S103, locking generator injected type ground protection movement.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (4)
1. a kind of system of generator injected type ground protection conk-out protection, which is characterized in that mutual including generator generator terminal
Sensor (2), main transformer (3), grid-connected breaker (4), bus (5), enclosed busbar (6), first group of overhead line (7) and second group
Overhead line (8)；Wherein,
Generator (1) passes through generator generator terminal current transformer (2) and is connected through enclosed busbar (6) with main transformer (3) low-pressure side
It connects, first group of main transformer (3) high-pressure side overhead line (7) connect with grid-connected breaker (4) one end, and grid-connected breaker (4) is another
Second group of one end overhead line (8) connect with bus (5).
2. a kind of system of generator injected type ground protection conk-out protection according to claim 1, feature exist
When, work, generator (1), generator generator terminal current transformer (2), main transformer (3), grid-connected breaker (4) and bus
(5) when running, when the movement of generator injected type ground protection and the protection of conk-out simultaneously, generator generator terminal current transformer
(2) three-phase electricity flow valuve is collected more than or equal to electric current threshold value, continues to judge generator generator terminal current transformer after the 150ms that is delayed
(2) collect whether three-phase electricity flow valuve is less than electric current threshold value.
3. a kind of system of generator injected type ground protection conk-out protection according to claim 1, feature exist
When, work, generator (1), generator generator terminal current transformer (2), main transformer (3), grid-connected breaker (4) and bus
(5) when running, when the movement of generator injected type ground protection and the protection of conk-out simultaneously, generator generator terminal current transformer
(2) three-phase electricity flow valuve is collected less than electric current threshold value, locking generator injected type ground protection movement.
4. a kind of method of generator injected type ground protection conk-out protection, which is characterized in that this method is wanted based on right
A kind of system of generator injected type ground protection conk-out protection, includes the following steps: described in asking 1
Step S101, starts the movement of generator injected type ground protection and conk-out simultaneously is protected, and enters next step；
Step S102 judges that generator generator terminal current transformer (2) collects three-phase electricity flow valuve more than or equal to electric current threshold value, if
Judging result is "Yes", continues step S102 after the 150ms that is delayed, if judging result is "No", it was demonstrated that grid-connected breaker (4)
Tripping then enters step S103；
Step S103, locking generator injected type ground protection movement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811191246.6A CN109103848B (en) | 2018-10-12 | 2018-10-12 | System and method for starting failure protection of injection type ground protection of generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811191246.6A CN109103848B (en) | 2018-10-12 | 2018-10-12 | System and method for starting failure protection of injection type ground protection of generator |
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| CN109103848A true CN109103848A (en) | 2018-12-28 |
| CN109103848B CN109103848B (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811191246.6A Active CN109103848B (en) | 2018-10-12 | 2018-10-12 | System and method for starting failure protection of injection type ground protection of generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317923A (en) * | 2020-10-28 | 2021-02-05 | 西安热工研究院有限公司 | Grounding device and method for welding wind power steel pipe pile |
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| CN203951167U (en) * | 2014-03-14 | 2014-11-19 | 中国能源建设集团广东省电力设计研究院 | Generator outlet circuit-breaker failure portection equipment |
| EP3011652A1 (en) * | 2013-06-21 | 2016-04-27 | Schneider Electric USA, Inc. | Synthetic fault remote disconnect for a branch circuit |
| CN205407235U (en) * | 2016-03-02 | 2016-07-27 | 苏州热工研究院有限公司 | A protection device that is used for generator export circuit breaker malfunctioning |
| CN108183464A (en) * | 2018-01-17 | 2018-06-19 | 西安热工研究院有限公司 | A kind of judgement system and method for generator start and stop protection automatic switching |
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2018
- 2018-10-12 CN CN201811191246.6A patent/CN109103848B/en active Active
Patent Citations (4)
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| EP3011652A1 (en) * | 2013-06-21 | 2016-04-27 | Schneider Electric USA, Inc. | Synthetic fault remote disconnect for a branch circuit |
| CN203951167U (en) * | 2014-03-14 | 2014-11-19 | 中国能源建设集团广东省电力设计研究院 | Generator outlet circuit-breaker failure portection equipment |
| CN205407235U (en) * | 2016-03-02 | 2016-07-27 | 苏州热工研究院有限公司 | A protection device that is used for generator export circuit breaker malfunctioning |
| CN108183464A (en) * | 2018-01-17 | 2018-06-19 | 西安热工研究院有限公司 | A kind of judgement system and method for generator start and stop protection automatic switching |
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| CN112317923A (en) * | 2020-10-28 | 2021-02-05 | 西安热工研究院有限公司 | Grounding device and method for welding wind power steel pipe pile |
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