CN109103848B - System and method for starting failure protection of injection type ground protection of generator - Google Patents
System and method for starting failure protection of injection type ground protection of generator Download PDFInfo
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- CN109103848B CN109103848B CN201811191246.6A CN201811191246A CN109103848B CN 109103848 B CN109103848 B CN 109103848B CN 201811191246 A CN201811191246 A CN 201811191246A CN 109103848 B CN109103848 B CN 109103848B
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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
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Abstract
The invention relates to a system and a method for protecting the starting failure of an injection type grounding protection of a generator, wherein the system comprises a main transformer, a bus, an overhead line and the like; the generator penetrates through a current transformer at the generator end and is connected with the low-voltage side of a main transformer through a closed bus, the high-voltage side of the main transformer is connected with one end of a grid-connected circuit breaker through a first group of overhead lines, and the other end of the grid-connected circuit breaker is connected with the bus through a second group of overhead lines. The method comprises the following steps: starting the injection type grounding protection action of the generator and starting the failure protection at the same time; judging whether the three-phase current value acquired by a current transformer at the generator terminal is greater than or equal to a current threshold value, if the judgment result is yes, continuing to perform the step after the time delay of 150ms, if the judgment result is no, proving that the grid-connected circuit breaker is tripped, entering the next step; and locking the injection type grounding protection action of the generator. The invention solves the problem that the injection type grounding protection of the generator cannot start the failure protection, and has the advantages of reasonable outlet mode, accurate judgment and strong adaptability.
Description
Technical Field
The invention belongs to the technical field of relay protection, and particularly relates to a system and a method for starting failure protection of injection type ground protection of a generator.
Background
Generator injection ground protection is protection for reacting to a generator stator (or rotor) ground fault. The injection type grounding protection principle of the generator is that an auxiliary power supply device provides an external low-frequency power supply, low-frequency voltage and current signals are injected into a stator (or rotor) winding of the generator, and then the injected low-frequency voltage and current signals are detected by a protection device. When the generator stator (or rotor) winding has ground fault, the injected low-frequency voltage and current signals also change, the protection device calculates the collected low-frequency voltage and current signals through a admittance method, if the ground resistance value is lower than the ground resistance criterion, the generator stator (or rotor) winding is determined to be grounded, and the generator injection type ground protection acts.
In general, the grounding protection action outlet mode of the stator of the generator is to jump a main switch of the generator (or a generator-transformer group) and start the breaker failure protection, but the injection grounding protection action outlet mode of the generator cannot start the breaker failure protection. After the injection type grounding protection of the generator acts, no matter whether the main switch of the generator (or a generator-transformer group) is tripped or not, low-frequency voltage and current signals injected into a stator (or a rotor) winding of the generator still exist, so that the injection type grounding protection of the generator acts all the time, and the risk of false starting of the breaker failure protection is increased. The conventional injection type grounding protection action outlet of the generator has the following defects and shortcomings:
(1) the action exit approach is not reasonable. If the conventional generator injection type grounding protection action outlet starts the breaker failure protection, the risk of false starting of the breaker failure protection is increased because the generator injection type grounding protection always acts;
(2) increasing the risk of damage to the equipment. If the conventional generator injection type grounding protection action outlet does not start the breaker failure protection, primary equipment can be seriously damaged if the breaker fails.
Disclosure of Invention
The invention provides a system and a method for the fault protection of the injection type ground protection starting of a generator, aiming at the defect that the fault protection of the circuit breaker cannot be started after the injection type ground protection of the generator acts.
The invention is realized by adopting the following technical scheme:
a system for protecting the starting failure of an injection type grounding protection of a generator comprises a generator terminal transformer, a main transformer, a grid-connected circuit breaker, a bus, a closed bus, a first group of overhead lines and a second group of overhead lines; wherein the content of the first and second substances,
the generator penetrates through a current transformer at the generator end and is connected with the low-voltage side of a main transformer through a closed bus, the high-voltage side of the main transformer is connected with one end of a grid-connected circuit breaker through a first group of overhead lines, and the other end of the grid-connected circuit breaker is connected with the bus through a second group of overhead lines.
The invention has the further improvement that when the generator, the generator terminal current transformer, the main transformer, the grid-connected circuit breaker and the bus operate during working, when the injection type grounding protection action of the generator and the failure protection are started simultaneously, the three-phase current value acquired by the generator terminal current transformer is more than or equal to the current threshold value, and whether the three-phase current value acquired by the generator terminal current transformer is less than the current threshold value is continuously judged after the time delay of 150 ms.
The further improvement of the invention is that when the generator, the generator terminal current transformer, the main transformer, the grid-connected circuit breaker and the bus operate during working, and when the injection type grounding protection action of the generator and the failure protection are started simultaneously, the current transformer at the generator terminal acquires a three-phase current value smaller than a current threshold value, and locks the injection type grounding protection action of the generator.
A method for protecting the start failure of the injection type ground protection of the generator is based on the system for protecting the start failure of the injection type ground protection of the generator, and comprises the following steps:
step S101, starting an injection type grounding protection action of the generator and starting failure protection at the same time, and entering the next step;
step S102, judging that a three-phase current value acquired by a current transformer at the generator end is greater than or equal to a current threshold value, if the judgment result is yes, continuing to perform the step S102 after delaying for 150ms, if the judgment result is no, proving that the grid-connected circuit breaker is tripped, and entering the step S103;
step S103, locking the injection type grounding protection action of the generator.
The invention has the following beneficial technical effects:
1. the outlet mode is reasonable. The invention adopts the generator terminal current value as the auxiliary criterion to judge whether the grid-connected circuit breaker is tripped, so that the injection type grounding protection of the generator can start the failure protection of the circuit breaker, and the protection outlet mode is reasonable.
2. And the adaptability is strong. The invention has strong practicability, does not need to increase primary equipment, and is suitable for all relay protection devices.
3. The judgment result is accurate. The invention adopts a reliable judging method to judge the state of the grid-connected circuit breaker, thereby accurately judging whether the grid-connected circuit breaker fails or not.
In conclusion, the invention solves the problem that the injection type ground protection of the generator cannot start the failure protection, adopts the current value at the generator end as the criterion to judge whether the grid-connected circuit breakers are reliably separated or not so as to determine whether to lock the injection type ground protection action of the generator or not, and has the advantages of reasonable outlet mode, accurate judgment and strong adaptability.
Drawings
FIG. 1 is a schematic block diagram of the main wiring of the present invention.
Fig. 2 is a flow chart of the automatic start-stop protection of the generator.
In the figure: 1-a generator; 2-generator terminal current transformer; 3-a main transformer; 4-a grid-connected breaker; 5-bus bar; 6-enclosed bus; 7-a first set of overhead lines; 8-second set of overhead lines.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
As shown in fig. 1, the system for protecting the start failure of the injection type ground protection of the generator provided by the invention comprises a generator 1, a generator-side current transformer 2, a main transformer 3, a grid-connected circuit breaker 4, a bus 5, a closed bus 6, a first group of overhead lines 7 and a second group of overhead lines 8.
The generator 1 penetrates through a generator terminal current transformer 2 to be connected with a low-voltage side of a main transformer 3, a high-voltage side of the main transformer 3 is connected with one end of a grid-connected circuit breaker 4 through a first group of overhead lines 7, and the other end of the grid-connected circuit breaker 4 is connected with a bus 5 through a second group of overhead lines 8.
When the generator operates normally, when the generator 1, the generator terminal current transformer 2, the main transformer 3, the grid-connected circuit breaker 4 and the bus 5 operate normally, the current value acquired by the generator terminal current transformer 2 is larger than or equal to the threshold value when the generator operates in an injection type grounding protection mode, and whether the three-phase current value acquired by the generator terminal current transformer 2 is larger than or equal to the threshold value is judged after the time delay of 150 ms.
Or when the generator 1, the generator-side current transformer 2, the main transformer 3, the grid-connected circuit breaker 4 and the bus 5 normally operate, the generator-side current transformer 2 acquires a current value smaller than a current threshold value when the generator performs the injection type ground protection action, and the generator injection type ground protection action is locked.
As shown in fig. 1 and 2, the present invention provides a method for start failure protection of injection type ground protection of a generator, comprising the following steps:
step S101, starting the injection type grounding protection action of the generator and starting the breaker failure protection at the same time, and entering the next step;
step S102, judging whether the three-phase current value acquired by the current transformer 2 at the generator end is greater than or equal to a current threshold value, if so, delaying 150ms and continuing to perform the step S102; if the judgment result is no, the grid-connected circuit breaker 4 is proved to be tripped, and the step S103 is carried out;
step S103, locking the injection type grounding protection action of the generator.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (2)
1. A system for starting failure protection of an injection type ground protection of a generator is characterized by comprising a generator terminal transformer (2), a main transformer (3), a grid-connected circuit breaker (4), a bus (5), a closed bus (6), a first group of overhead lines (7) and a second group of overhead lines (8); wherein the content of the first and second substances,
the generator (1) penetrates through a current transformer (2) at the generator end and is connected with the low-voltage side of a main transformer (3) through a closed bus (6), the high-voltage side of the main transformer (3) is connected with one end of a grid-connected circuit breaker (4) through a first group of overhead lines (7), and the other end of the grid-connected circuit breaker (4) is connected with a bus (5) through a second group of overhead lines (8);
when the generator works, when the generator (1), the generator terminal current transformer (2), the main transformer (3), the grid-connected circuit breaker (4) and the bus (5) run, when the injection type grounding protection of the generator acts and the failure protection is started simultaneously, the three-phase current value acquired by the generator terminal current transformer (2) is more than or equal to the current threshold value, and whether the three-phase current value acquired by the generator terminal current transformer (2) is less than the current threshold value is continuously judged after the time delay of 150 ms;
when a generator (1), a generator terminal current transformer (2), a main transformer (3), a grid-connected circuit breaker (4) and a bus (5) run, when the injection type ground protection of the generator acts and the failure protection is started simultaneously, the generator terminal current transformer (2) acquires that the three-phase current value is smaller than the current threshold value, and the injection type ground protection action of the generator is locked.
2. A method for start-up fault protection with injection ground protection for a generator, which is based on the system for start-up fault protection with injection ground protection for a generator of claim 1, and comprises the following steps:
step S101, starting an injection type grounding protection action of the generator and starting failure protection at the same time, and entering the next step;
step S102, judging that a three-phase current value acquired by a current transformer (2) at the generator end is greater than or equal to a current threshold value, if the judgment result is yes, continuing to perform the step S102 after delaying for 150ms, if the judgment result is no, proving that a grid-connected circuit breaker (4) is tripped, and entering the step S103;
step S103, locking the injection type grounding protection action of the generator.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| CN109103848B true CN109103848B (en) | 2020-02-28 |
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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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| EP3011652A4 (en) * | 2013-06-21 | 2016-12-28 | 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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