CN204947582U - Loop is distributed in the jumping of 220kV failure protection connection rationally - Google Patents
Loop is distributed in the jumping of 220kV failure protection connection rationally Download PDFInfo
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- CN204947582U CN204947582U CN201520438647.2U CN201520438647U CN204947582U CN 204947582 U CN204947582 U CN 204947582U CN 201520438647 U CN201520438647 U CN 201520438647U CN 204947582 U CN204947582 U CN 204947582U
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Abstract
Loop is distributed in the jumping of 220kV failure protection connection rationally, comprising: 1TJ main transformer protection 1,2TJ main transformer protection 2, TJR bus differential protection, main transformer circuit breaker auxiliary protection, 2TJR bus differential protection 2,220kV mother difference malfunctioning device, SLQD2 main transformer circuit breaker auxiliary protection output contact, main transformer non-charge device.The utility model adopts main transformer to uprise malfunctioning switch connection jumping main transformer three side loop and realizes; the main transformer of breaker failure can be effectively avoided to damage because sending short-circuit current rush by 110kV system reaching with the backup protection of adjacent main transformer setting value and action to cause the appearance of expansion accident range problem; shorten the time of excision fault, ensure system safety.
Description
Technical field
The utility model belongs to technical field of electric power, particularly relate to 220kV main transformer uprise malfunctioning jumping main transformer three side distribute loop rationally.
Background technology
When failure protection refers to that 220kV and above electric equipment break down; relaying protection action send trip signal and circuit breaker tripping time; the protection act information of faulty equipment and the current information of tripping circuit breaker is utilized to form differentiation to breaker failure; other relevant circuit breakers in same plant stand can be excised with the shorter time limit; power failure range is limited in minimum; thus ensure the stable operation of whole electrical network, avoid causing the serious scaling loss of the fault element such as generator, transformer and the collapse of electrical network to disintegrate accident.In Modern high-pressure and supergrid, failure protection obtains as the nearly backup protection mode of one and generally adopts.
For the main transformer being connected to double bus scheme, uprise breaker failure behavior and there is following several situation:
1., during main transformer internal fault, main transformer protection action, uprises breaker failure.Now main transformer protection action tripping is except other side circuit breakers of malfunctioning circuit breaker, and breaker fail protection needs all power branch on the bus of tripping transformer place, could excise fault.
2. high-side system faults, transform er backup protection jumps high-pressure side circuit breaker, and high-pressure side breaker failure, need all power branch on breaker fail protection tripping high-voltage side bus and other side circuit breakers of main transformer, excision fault.
3. busbar fault; when uprising breaker failure; other active legs on bus differential protection tripping main transformer place bus; but other side power supplys of main transformer can continue to provide short circuit current to fault bus; if also rely on main transformer backup protection band certain time-delay to jump three side switch excision faults, then transformer may be burnt.Other side power circuit breakers of mode tripping main transformer of malfunctioning jumping must be taked to excise fault.
By above analysis; can reach a conclusion: when bus differential protection and failure protection coordinate; regardless of main transformer protection action or bus bar differential prptection operation; all answer starting circuit breaker failure protection; when main transformer circuit breaker is indeed malfunctioning; the then breaker fail protection all power branch of action tripping main transformer circuit breaker place bus on the one hand, then other side power circuit breakers of main transformer jumped by action connection on the other hand.
But in Practical Project, due to the otherness of bus differential protection and main transformer protection functional realiey, the design of the startup in malfunctioning loop, logic discrimination and outlet loop is varied.Such as, periodical literature " brief talk main transformer 220kV side malfunctioning switch and jump main transformer three side switch " adopts according to whether determining malfunctioning jumping scheme by the malfunctioning starting of special device and the locking of releasing high pressure; The function that " transformer breaker based Cb Failure Protection removes the selection of voltage blocking scheme " adopts protection act judgement, malfunctioning electric current criterion and time delay to export is placed in 220kV bus differential protection and realizes.
In 220kV transformer station and 500kV transformer station, the secondary device configuration in breaker protection is more, and need be equipped with multiple screen cabinet, investment is large, and floor space is many.How to distribute failure protection rationally, reduce secondary device configuration and screen cabinet quantity, to saving construction investment, reduce district of institute and take up an area, there is positive meaning the Accelerating The Construction duration.
Summary of the invention
In order to solve the problem, the utility model provides the jumping of a kind of 220kV failure protection connection and distributes loop rationally, and main transformer each side circuit breaker jumped by the circuit breaker auxiliary protection outlet connection utilizing main transformer protection to shield.
The technical solution of the utility model is as follows:
Loop is distributed in the jumping of 220kV failure protection connection rationally, comprising: 1TJ main transformer protection 1,2TJ main transformer protection 2, TJR bus differential protection, main transformer circuit breaker auxiliary protection, 2TJR bus differential protection 2,220kV mother difference malfunctioning device, SLQD2 main transformer circuit breaker auxiliary protection output contact, main transformer non-charge device; Wherein, 1TJ main transformer protection 1,2TJ main transformer protection 2, the conk-out of TJR bus differential protection access main transformer circuit breaker auxiliary protection open into; 2TJ main transformer protection 2,2TJR bus differential protection 2 access the malfunctioning device conk-out of 220kV mother difference open into; 1TJ main transformer protection 1,2TJ main transformer protection 2, TJR bus differential protection access main transformer non-charge device starts non electrical quantity tripping operation; after main transformer circuit breaker auxiliary protection device receives action connection point conk-out simultaneously; output contact SLQD2; SLQD2 is main transformer circuit breaker auxiliary protection output contact; contain protection act (i.e. conk-out have open into) and have the condition of stream; connect with protection act contact and access the tripping operation input circuit that transformer non-electricity protects, complete the function that main transformer uprises the malfunctioning jumping each side of main transformer.
When main transformer circuit breaker auxiliary protection device only realizes connection jumping each side function; require to adopt protection act contact to open into circuit breaker auxiliary protection device; and jump current judgement contact serial connection protection act contact in each side loop of main transformer at connection, start main transformer non-charge trip(ping) circuit connection through malfunctioning action delay and jump main transformer each side circuit breaker.
Operating principle: when 1TJ main transformer protection 1 or 2TJ main transformer protection 2 or TJR bus bar differential prptection operation, starts protection equipment for busbar malfunctioning and complete malfunctioning judgement.After simultaneously main transformer circuit breaker auxiliary protection device receives action connection point conk-out, output contact SLQD2, connect with protection act contact and accesses the tripping operation input circuit that transformer non-electricity protects, complete main transformer and uprise malfunctioning function of jumping each side of main transformer.
In order to prevent transformer breaker not malfunctioning mistiming saltus step depressor each side circuit breaker; can through short time delay outlet tripping operation; increase time delay also can prevent instantaneity interference from causing shear depressor each side circuit breaker by mistake simultaneously; time delay should be greater than breaker time and bus differential protection return time sum, preferred 100ms.
In order to improve the sensitivity of based Cb Failure Protection, during protection equipment for transformer start failure protection, the current judgement element adopting phase current, zero-sequence current and negative-sequence current or door to form carrys out actuating breaker failure protection device.When after circuit breaker tripping, require that current judgement element can fast return.Early stage protective device breaker failure has stream criterion to be that phase current starts, and for ensureing sensitivity, generally its current setting is less, and setting value is about 20% of rated current.During normal operation, current judgement relay is in operate condition, does not play locking effect, reduces the reliability of failure protection.And zero sequence and negative-sequence current just exist when fault, when normally running, " zero sequence or negative-sequence current " criterion can not start.For transformer fault, majority is asymmetric fault, and as turn-to-turn short circuit, single-phase earthing etc., " zero sequence or negative-sequence current " criterion can effectively differentiate.When there is three-phase shortcircuit or hree-phase symmetry ground short circuit, without zero sequence and negative-sequence current, now by the action of " phase current " criterion.Because adding " zero sequence or negative-sequence current " criterion, " phase current " starts 1.2 times that definite value can bring up to rated current, does not start under normal operating conditions, can improve the reliability of failure protection.
The utility model compared with the existing technology, has the following advantages and beneficial effect:
1. when main transformer uprise switch need action tripping malfunctioning time, if still remove excision main transformer each side switch by backup protection with certain time-delay, two consequences may be there are: one is that the main transformer of breaker failure damages because of the larger short-circuit current rush brought by 110kV system; Two is that the backup protection of adjacent main transformer reaches setting value and action, causes expansion accident scope.The utility model adopts main transformer to uprise the realization of malfunctioning switch connection jumping main transformer three side loop, effectively can avoid the appearance of the problems referred to above, shorten and excise fault time, ensure system safety.
2. the utility model compared with prior art, enormously simplify Equipments Setting, decreases screen cabinet quantity.
Accompanying drawing explanation
Fig. 1 a is that main transformer circuit breaker auxiliary protection is opened into winding diagram;
Fig. 1 b is conk-out circuit wiring diagram;
Fig. 1 c is outlet loop winding diagram;
Fig. 2 is the structural representation of the malfunctioning current judgement element that the utility model adopts.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is clearly and completely described.
Loop is distributed in the jumping of the utility model 220kV failure protection connection rationally, comprising: 1TJ main transformer protection 1,2TJ main transformer protection 2, TJR bus differential protection, main transformer circuit breaker auxiliary protection, 2TJR bus differential protection 2,220kV mother difference malfunctioning device, SLQD2 main transformer circuit breaker auxiliary protection output contact, main transformer non-charge device.
As shown in Figure 1a, 1TJ main transformer protection 1,2TJ main transformer protection 2, the conk-out of TJR bus differential protection access main transformer circuit breaker auxiliary protection open into; As shown in Figure 1 b, 2TJ main transformer protection 2,2TJR bus differential protection 2 access the conk-out of 220kV mother difference malfunctioning device open into; As illustrated in figure 1 c; 1TJ main transformer protection 1,2TJ main transformer protection 2, TJR bus differential protection access main transformer non-charge device starts non electrical quantity tripping operation; after main transformer circuit breaker auxiliary protection device receives action connection point conk-out simultaneously; output contact SLQD2; SLQD2 is main transformer circuit breaker auxiliary protection output contact; contain protection act (i.e. conk-out have open into) and have the condition of stream; connect with protection act contact and access the tripping operation input circuit that transformer non-electricity protects, complete the function that main transformer uprises the malfunctioning jumping each side of main transformer.
When main transformer circuit breaker auxiliary protection device only realizes connection jumping each side function; require to adopt protection act contact to open into circuit breaker auxiliary protection device; and jump current judgement contact serial connection protection act contact in each side loop of main transformer at connection, start main transformer non-charge trip(ping) circuit connection through malfunctioning action delay and jump main transformer each side circuit breaker.
Operating principle: when 1TJ main transformer protection 1 or 2TJ main transformer protection 2 or TJR bus bar differential prptection operation, starts protection equipment for busbar malfunctioning and complete malfunctioning judgement.After simultaneously main transformer circuit breaker auxiliary protection device receives action connection point conk-out, output contact SLQD2, connect with protection act contact and accesses the tripping operation input circuit that transformer non-electricity protects, complete main transformer and uprise malfunctioning function of jumping each side of main transformer.
In order to prevent transformer breaker not malfunctioning mistiming saltus step depressor each side circuit breaker; can through short time delay outlet tripping operation; increase time delay also can prevent instantaneity interference from causing shear depressor each side circuit breaker by mistake simultaneously; time delay should be greater than breaker time and bus differential protection return time sum, preferred 100ms.
As shown in Figure 2, in order to improve the sensitivity of based Cb Failure Protection, during protection equipment for transformer start failure protection, the current judgement element adopting phase current, zero-sequence current and negative-sequence current or door to form carrys out actuating breaker failure protection device.When after circuit breaker tripping, require that current judgement element can fast return.Early stage protective device breaker failure has stream criterion to be that phase current starts, and for ensureing sensitivity, generally its current setting is less, and setting value is about 20% of rated current.During normal operation, current judgement relay is in operate condition, does not play locking effect, reduces the reliability of failure protection.And zero sequence and negative-sequence current just exist when fault, when normally running, " zero sequence or negative-sequence current " criterion can not start.For transformer fault, majority is asymmetric fault, and as turn-to-turn short circuit, single-phase earthing etc., " zero sequence or negative-sequence current " criterion can effectively differentiate.When there is three-phase shortcircuit or hree-phase symmetry ground short circuit, without zero sequence and negative-sequence current, now by the action of " phase current " criterion.Because adding " zero sequence or negative-sequence current " criterion, " phase current " starts 1.2 times that definite value can bring up to rated current, does not start under normal operating conditions, can improve the reliability of failure protection.
In order to anti-locking apparatus single failure causes malfunctioning or main transformer protection action tripping operation, during concrete enforcement, following 2 points should be accomplished:
1. adopt protection act contact to open into while circuit breaker auxiliary protection device, jump current judgement contact in each side loop of main transformer be connected in series the dual mode of checking on of protection act contact at corresponding unsuccessful reason, the multiple pressure of releasing, connection.
2. when protection act output number of connections limited, the priority that protection act contact uses should be considered in the following order: protection act contact open into circuit breaker auxiliary protection device, jump each side loop serial connection protection act contact at unsuccessful reason loop serial connection protection act contact, connection, remove and press off lock loop serial connection protection act contact again.
Claims (1)
- Loop is distributed in the jumping of 1.220kV failure protection connection rationally, it is characterized in that, comprising: 1TJ main transformer protection 1,2TJ main transformer protection 2, TJR bus differential protection, main transformer circuit breaker auxiliary protection, 2TJR bus differential protection 2,220kV mother difference malfunctioning device, SLQD2 main transformer circuit breaker auxiliary protection output contact, main transformer non-charge device; Wherein, 1TJ main transformer protection 1,2TJ main transformer protection 2, the conk-out of TJR bus differential protection access main transformer circuit breaker auxiliary protection open into; 2TJ main transformer protection 2,2TJR bus differential protection 2 access the malfunctioning device conk-out of 220kV mother difference open into; 1TJ main transformer protection 1,2TJ main transformer protection 2, TJR bus differential protection access main transformer non-charge device starts non electrical quantity tripping operation; after main transformer circuit breaker auxiliary protection device receives action connection point conk-out simultaneously; output contact SLQD2; connect with protection act contact and access the tripping operation input circuit that transformer non-electricity protects, complete the function that main transformer uprises the malfunctioning jumping each side of main transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520438647.2U CN204947582U (en) | 2015-06-24 | 2015-06-24 | Loop is distributed in the jumping of 220kV failure protection connection rationally |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520438647.2U CN204947582U (en) | 2015-06-24 | 2015-06-24 | Loop is distributed in the jumping of 220kV failure protection connection rationally |
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| CN204947582U true CN204947582U (en) | 2016-01-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129971A (en) * | 2016-08-12 | 2016-11-16 | 许继集团有限公司 | A kind of busbar protective device chopper dual failure fault partition method and system |
| CN112653106A (en) * | 2020-12-10 | 2021-04-13 | 中水东北勘测设计研究有限责任公司 | Method for starting failure loop of intelligent hydropower station circuit breaker failure protection device |
-
2015
- 2015-06-24 CN CN201520438647.2U patent/CN204947582U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129971A (en) * | 2016-08-12 | 2016-11-16 | 许继集团有限公司 | A kind of busbar protective device chopper dual failure fault partition method and system |
| CN106129971B (en) * | 2016-08-12 | 2019-07-23 | 许继集团有限公司 | A kind of dual failure fault partition method of busbar protective device breaker and system |
| CN112653106A (en) * | 2020-12-10 | 2021-04-13 | 中水东北勘测设计研究有限责任公司 | Method for starting failure loop of intelligent hydropower station circuit breaker failure protection device |
| CN112653106B (en) * | 2020-12-10 | 2022-09-13 | 中水东北勘测设计研究有限责任公司 | Method for starting failure loop of intelligent hydropower station circuit breaker failure protection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |