CN202696129U - Bus bar differential structure of booster station in electric one-through connection mode - Google Patents
Bus bar differential structure of booster station in electric one-through connection mode Download PDFInfo
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- CN202696129U CN202696129U CN 201220337585 CN201220337585U CN202696129U CN 202696129 U CN202696129 U CN 202696129U CN 201220337585 CN201220337585 CN 201220337585 CN 201220337585 U CN201220337585 U CN 201220337585U CN 202696129 U CN202696129 U CN 202696129U
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Abstract
The utility model relates to a bus bar differential structure of a booster station in an electric one-through connection mode. A spare transformer is spanned on two bus bars by virtue of one circuit breaker and two isolation switches, wherein a current transformer (CT) used for bus bar differential protection is respectively connected between the two isolation switches and the two bus bars in series. According to the bus bar differential structure of the booster station in the electric one-through connection mode provided by the utility model, a position of the CT used for the bus bar differential protection is changed, so that the CTs used for protecting the two bus bars are mutually independent, current loops used for protecting the two bus bars are mutually independent, and bus bar protection requirement in a half-connection mode is met; an electric one-through design is changed, so that the bus bar differential protection can reliably act, a fault is removed correctly, and a false operation of protection can not be caused; besides, investment cost on transformation of the secondary circuit and protection is lower, safe and reliable operating requirement can be met, and protection can be carried out reliably, so that higher reference is provided for design, construction, debugging and the like of a transformer substation in future.
Description
Technical field
The utility model belongs to the electric power transmission technical field, relates to the electric primary connection of a kind of booster stations, the bus differential structure of the electric primary connection mode of especially a kind of booster stations.
Background technology
No matter the normal operation of booster stations bus is to electrical network; or the safe and stable operation on the generating set that is connected in bus has again and important impact; and bus differential protection is very important protection in the booster stations system protection; the correct reliability of its action but directly affect the booster stations bus safe and stable operation
The mode of connection of booster stations has determined the form of bus protection; the many modes of connection of booster stations have single bus scheme mode, double bus scheme mode, a half breaker mode of connection (i.e. one and half modes of connection) at present; for these modes of connection commonly used; all formed fixing protection form, and supporting protection equipment has also been arranged.In recent years, along with the requirement of making falls in energy-saving and emission-reduction and capital construction, a lot of designing institutees has designed some more special modes of connection, but great majority are not considered the correct configuration of protection, to such an extent as to there is at the construction field (site) the problem of some technology.
Booster stations are a kind of special mode of connection; whole booster stations principle is designed to one and half modes of connection; but the spare transformer interval then belongs to imperfect string; spare transformer is through a circuit breaker; two isolation switchs are connected across on two buses; as shown in Figure 1; the spare transformer high voltage side current is connected in series to bus differential protection I; the II cabinet; that bus differential protection device is selected is the auspicious BP-2C in south, Shenzhen; the auspicious 915E in south, Nanjing; these two kinds of bus differential protection devices for one and half modes of connection do not have according to the disconnecting link switch current; carry out the function of differential current computing; so can not satisfy the requirement of protection; because in the situation of normal operation; no matter which bar bus spare transformer is connected to; article two, the bus differential protection of bus all can flow through the spare transformer electric current; so wherein must have a bus differential protection and produce under normal circumstances poor stream, and maximum difference stream at this moment calculates (pressing spare transformer capacity 57MVA calculates):
Idmax=57/1.732×330=100A
In addition when spare transformer is connected across two buses simultaneously (such as in the grid switching operation process of spare transformer); article two, the bus differential protection of bus produces poor stream under normal circumstances simultaneously; its poor stream is less than 100A, and concrete size is relevant with the sharing of load of two disconnecting links.
The poor stream that certain above two kinds of situations produce not is very large; also differ and reach surely the operating value of bus differential protection; cause the bus differential protection malfunction; but producing so large poor stream when normally moving also is unallowed concerning bus differential protection; also has a kind of situation exactly when breaking down in the spare transformer high-pressure side; the troubles inside the sample space that belongs to spare transformer; the external area error of bus protection; spare transformer protection should regular event; but because this mode of connection very likely can cause the very fast increase of differential current of bus differential protection; the bus differential protection action of bypassing the immediate leadership; especially when two disconnecting link paired runnings; article two, the bus differential protection of bus all might move, and has enlarged the scope that has a power failure.
The utility model content
The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art; the bus differential structure of the electric primary connection mode of a kind of booster stations is provided; this kind bus differential structure is according to the bus differential protection requirement of one and half modes of connection, can make the used current circuit of two bus protections separate.
The purpose of this utility model solves by the following technical programs:
The bus differential structure of the electric primary connection mode of this booster stations, spare transformer is connected across on two buses through a circuit breaker, two isolation switchs; Be serially connected with respectively the used Current Transmit of bus differential protection between described two isolation switchs and two buses.
More than be serially connected with two used Current Transmits of bus differential protection between each isolation switch and the bus.
The used Current Transmit of above-mentioned bus differential protection is connected to respectively the bus protection cabinet.
The bus differential structure of the electric primary connection mode of booster stations of the present utility model is by changing the position of the used Current Transmit of bus differential protection; make two used Current Transmits of bus protection separate; thereby make the used current circuit of two bus protections separate, reach the bus differential protection requirement of one and half modes of connection.This electric once design is changed, not only made it satisfy the protection requirement, bus differential protecting can be moved reliably, correctly excise fault, and can not cause the misoperation of protection.The investment for trnasforming urban land cost of this secondary circuit and protection is less in addition, and can satisfy safe and reliable service requirement, can make the protection action message.Have higher with reference to property for the design of from now on transformer station, construction, debugging etc.
Description of drawings
Fig. 1 is the wiring schematic diagram of booster stations in the prior art;
Fig. 2 is booster stations wiring schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done and to be described in further detail:
Referring to Fig. 2, in the bus differential structure of the electric primary connection mode of this kind booster stations, booster stations still are designed to one and half modes of connection, spare transformer Q is connected across on two buses through a circuit breaker DL31, two isolation switch K1, K2, be connected with circuit breaker DL31 after namely the end of two isolation switch K1, K2 interconnects, the other end of two isolation switch K1, K2 is connected to respectively two buses.And between two isolation switch K1, K2 and two buses, be serially connected with respectively the used Current Transmit of bus differential protection.Between each isolation switch and bus, be serially connected with two used Current Transmits of bus differential protection.The used Current Transmit of these bus differential protections is connected to respectively the bus protection cabinet.
In sum; bus differential structure of the present utility model is the bus differential protection requirement according to one and half modes of connection; article two, the used current circuit of bus protection should be separate; be independent of each other; should consider this moment by changing the position of the used Current Transmit of bus differential protection; make two used Current Transmits of bus protection separate; but consider that simultaneously protection can not leave the dead band; the used high voltage side current instrument transformer CT of spare transformer differential protection changes the position simultaneously; as shown in Figure 2; spare transformer protection this moment can be with the current parallel access protection of two disconnecting links, and protective device is not done change.When this change normally moves at booster stations, bus differential will can not produce poor stream.By the transformation of primary system, can effectively solve the problem among existing Fig. 1, the bus differential protection of one and half modes of connection of the improved mode of connection and normal condition is just the same.
In order to cooperate the transformation of connected mode of the present utility model, need to increase at the same time bus isolation switch handoff functionality on the software of bus differential protecting:
The transformation of second protection equipment mainly is the characteristics according to the double-bus protection; that increases the disconnecting link handoff functionality exactly, no matter is the protection of that bus namely, when only having disconnecting link when this bus in co-bit; bus differential protection just calculates the spare transformer electric current, otherwise does not calculate the spare transformer electric current.Changing like this needs producer to do a large amount of change work; except the software of protection is made amendment; also increase disconnecting link and drive ingress and heavy motor type relay, simultaneously when preventing the maintenance of disconnecting link contact on the impact of protection, also increased disconnecting link and forced minute, forced the operating handle that closes.By above change, when booster stations normally moved, bus protection can not produce poor stream, and when bus had fault, bus protection can be excised the fault point fast, guaranteed the reliable and stable operation of booster stations.
Claims (4)
1. the bus differential structure of the electric primary connection mode of booster stations, it is characterized in that: spare transformer (Q) is connected across on two buses through a circuit breaker (DL31), two isolation switchs (K1, K2); Be serially connected with respectively the used Current Transmit of bus differential protection between described two isolation switchs (K1, K2) and two buses.
2. the bus differential structure of the electric primary connection mode of booster stations according to claim 1, it is characterized in that: described booster stations are one and half modes of connection.
3. the bus differential structure of the electric primary connection mode of booster stations according to claim 1 is characterized in that: be serially connected with two used Current Transmits of bus differential protection between each isolation switch and the bus.
4. according to claim 1 or the bus differential structure of the electric primary connection mode of 3 described booster stations, it is characterized in that: the used Current Transmit of described bus differential protection is connected to respectively the bus protection cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220337585 CN202696129U (en) | 2012-07-12 | 2012-07-12 | Bus bar differential structure of booster station in electric one-through connection mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220337585 CN202696129U (en) | 2012-07-12 | 2012-07-12 | Bus bar differential structure of booster station in electric one-through connection mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696129U true CN202696129U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220337585 Expired - Fee Related CN202696129U (en) | 2012-07-12 | 2012-07-12 | Bus bar differential structure of booster station in electric one-through connection mode |
Country Status (1)
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| CN (1) | CN202696129U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015487A (en) * | 2017-06-08 | 2017-08-04 | 国网山东省电力公司莱芜供电公司 | It is a kind of to remind the transforming plant primary simulation system and method for bus removal of load |
| CN109904845A (en) * | 2019-04-09 | 2019-06-18 | 西安热工研究院有限公司 | A kind of electric system backup power supply bus protection modernization system and method |
-
2012
- 2012-07-12 CN CN 201220337585 patent/CN202696129U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015487A (en) * | 2017-06-08 | 2017-08-04 | 国网山东省电力公司莱芜供电公司 | It is a kind of to remind the transforming plant primary simulation system and method for bus removal of load |
| CN107015487B (en) * | 2017-06-08 | 2023-09-15 | 国网山东省电力公司莱芜供电公司 | Primary simulation system and method for transformer substation capable of reminding load shedding of bus |
| CN109904845A (en) * | 2019-04-09 | 2019-06-18 | 西安热工研究院有限公司 | A kind of electric system backup power supply bus protection modernization system and method |
| CN109904845B (en) * | 2019-04-09 | 2024-03-12 | 西安热工研究院有限公司 | Power system backup power bus protection transformation system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180802 Address after: 710065 No. 1 building, No. 12, Qin Tang, No. 187, science and technology four road, hi tech Zone, Xi'an, Shaanxi Patentee after: North China Electric Power Research Institute Co., Ltd. Xi'an branch Address before: 710065 No. 1, 12 building, Qin Tang four, No. four science and technology road, Xi'an, Shaanxi. Patentee before: North China Electrical Power Research Institute (Xi'an) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20200712 |