CN206727653U - A kind of large-sized unit electric main power connection in power plant circuit - Google Patents
A kind of large-sized unit electric main power connection in power plant circuit Download PDFInfo
- Publication number
- CN206727653U CN206727653U CN201720527611.0U CN201720527611U CN206727653U CN 206727653 U CN206727653 U CN 206727653U CN 201720527611 U CN201720527611 U CN 201720527611U CN 206727653 U CN206727653 U CN 206727653U
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- China
- Prior art keywords
- breaker
- transformer
- pressure side
- main
- generator
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Abstract
A kind of large-sized unit electric main power connection in power plant circuit is the utility model is related to, including：Main transformer, its high-pressure side are connected with 220kV or 500kV high voltage distribution installations；Generating set house transformer, its high-pressure side is connected with main transformer low-pressure side, generating set house transformer low-pressure side is connected with the second breaker end of incoming cables, second breaker outgoing line end is connected with the 3rd breaker end of incoming cables, 3rd breaker outgoing line end is connected with stand-by power supply, and the second breaker outgoing line end and the 3rd breaker end of incoming cables are accessed on 6kV buses；Generator, it is connected with some main transformer low-pressure sides；First breaker, it is arranged on generator outlet, and the first breaker end of incoming cables is connected with generator, and the first breaker outgoing line termination becomes owner of step down side.The utility model beneficial effect：It is high using modular electrical wiring, zone configuration relay protection, protection sensitivity, fault rate is reduced, improves availability.
Description
Technical field
It the utility model is related to a kind of large-sized unit electric main power connection in power plant circuit.
Background technology
Generally in power plant, its main electrical scheme is generally unit style wiring, as shown in Figure 1.By taking two units as an example, respectively
If two double winding main transformers, main transformer high-pressure side are connected to 220kV or 500kV high voltage distribution installations.Two high-voltage Auxiliary divisions become,
Service power is provided for power plant.One starts standby change, and its high-pressure side is connected to 220kV high voltage distribution installations, as unit
Startup power supply draw connect and high factory become stand-by power supply.
Unit style electrical main connecting wire is the electricity generation system of a generator and main transformer composition, generator and main transformer it
Between branch draw and connect a unit transformer, with split-phase enclosed busbar generator and main transformer and factory's change be connected as one combine it is whole
Body.Usual generator outlet does not install breaker, and breaker is installed in the high-pressure side of main transformer, grid-connected as generator starting
It is used with being disconnected when shutting down.Station service requirement during in order to meet startup of unit and shut down, it is standby from 220kV buses connect one
Become, public startup power supply and stand-by power supply as two units.
Unit style wiring carries out the grid-connected of generator with the on high-tension side breaker of main transformer and disconnected, and each start and stop will also be carried out
Service power switches, complex operation, is also easy to induce transient phenomena, so probability of failure is of a relatively high.Generator and transformer
It can not separate and be tested and overhauled, adjusting and testing for relay protection can not separate progress.
Utility model content
Weak point present in regarding to the issue above, the utility model provide a kind of large-sized unit electric main power connection in power plant
Circuit is relative to reduce event using modular electrical wiring, modular wiring zone configuration relay protection, the high sensitivity of protection
Barrier rate, improve availability.
To achieve the above object, the utility model provides a kind of large-sized unit electric main power connection in power plant circuit, including：
Main transformer, its high-pressure side are connected with 220kV or 500kV high voltage distribution installations, some main transformers with
220kV or 500kV high voltage distribution installations connect；
Generating set house transformer, its high-pressure side are connected with the main transformer low-pressure side, some generators
Group house transformer high-pressure side is connected with some main transformer low-pressure sides respectively, and the generating set house transformer is low
Pressure side is connected with the second breaker end of incoming cables, and the second breaker outgoing line end is connected with the 3rd breaker end of incoming cables, and described the
Three breaker outgoing line ends are connected with stand-by power supply, and the second breaker outgoing line end and the 3rd breaker end of incoming cables are accessed
On 6kV section buses；
Generator, it is connected with the low-pressure side of some main transformers；
First breaker, it is arranged on the generator outlet, and the generator outlet sets some in parallel first
Breaker, the first breaker end of incoming cables are connected with the generator, and first breaker outgoing line is terminated into the main transformer
The low-pressure side of depressor.
Further improved as the utility model, the main transformer is two, and the generating set house transformer is
Two, first breaker is two.
Further improved as the utility model, the main transformer is the three-phase transformer of star-delta connection.
Further improved as the utility model, the generating set house transformer is the three-phase of star-delta connection
Transformer.
The beneficial effects of the utility model are：
1st, generator outlet installing breaker in parallel, it is not necessary to installing standby change from 220kV is powered；
2nd, the repairing time of equipment and part is relevant with the number to break down and excision fault time, modular wiring point
Area configures relay protection, and the high sensitivity of protection cuts off that the time of failure is shorter, and the degree of device damage is relatively light, therefore
The repairing time of equipment is also relatively fewer；
3rd, the probability of failure of slave unit and repairing time analysis, the availability of modular wiring are more available than unit style wiring
Rate will height；
If the 4, high pressure is 220kV, the investment cost difference of two kinds of wiring is little, but if high pressure is 500kV, then usual mould
The wiring of block formula will save general 20% expense than unit style wiring.
Brief description of the drawings
Fig. 1 is the schematic diagram of large-sized unit electric main power connection in power plant circuit in the prior art；
Fig. 2 is a kind of schematic diagram of large-sized unit electric main power connection in power plant circuit of the utility model.
In figure：
1st, main transformer；2nd, generating set house transformer；3rd, generator；4th, the first breaker；5th, the second breaker；6、
3rd breaker.
Embodiment
As shown in Fig. 2 a kind of large-sized unit electric main power connection in power plant circuit of the utility model embodiment, using a hair
The modular electric main electrical scheme that motor 3 and two main transformers 1 form, the first open circuit in parallel of the outlet of generator 3 installing two
Device 4, parallel connection two main transformers 1 of access.
The high-pressure side of main transformer 1 is connected with 220kV or 500kV high voltage distribution installations, two main transformers 1 and 220kV or
500kV high voltage distribution installations connect.
The high-pressure side of generating set house transformer 2 is connected with the low-pressure side of main transformer 1, two generating set house transformers
2 high-pressure sides are connected with some low-pressure sides of main transformer 1 respectively, the low-pressure side of generating set house transformer 2 and the second breaker 5
End of incoming cables is connected, and the leading-out terminal of the second breaker 5 is connected with the end of incoming cables of the 3rd breaker 6, the leading-out terminal of the 3rd breaker 6 and standby electricity
Source is connected, and the leading-out terminal of the second breaker 5 and the end of incoming cables of the 3rd breaker 6 are accessed on 6kV section buses.
Generator 3 is connected with two low-pressure sides of main transformer 1.
First breaker 4 is arranged on generator 3 and exported, and the outlet of generator 3 sets two the first breakers 4 in parallel, the
The end of incoming cables of one breaker 4 is connected with generator 3, the leading-out terminal of the first breaker 4 access low-pressure side of main transformer 1.
Wherein, main transformer 1 is the three-phase transformer of star-delta connection.Generating set house transformer 2 is star
The three-phase transformer of triangle connection.
When specifically used, when generator 3 starts grid-connected or shutdown, electricity is accessed with the first breaker 4 of generator outlet
Net disconnects, the normal continuous charging operation of main transformer 1 from power network.This wiring is with the first breaker 4 generator 3 and master
Transformer 1 is divided into two pieces, when generator 3 is started and shut down, generating set house transformer 2 by main transformer 1 from 220kV or
500kV high voltage distribution installations are by electricity, and after generator 3 is grid-connected, generating set house transformer 2 is directly from generator 3 by electricity.Cause
This, modular electric main electrical scheme of the present utility model need not install the standby change from 220kV is powered, it is only necessary to draw and connect station-service section
Stand-by power supply.
Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all in the spirit and principles of the utility model
Within, any modification, equivalent substitution and improvements made etc., it should be included within the scope of protection of the utility model.
Claims (4)
- A kind of 1. large-sized unit electric main power connection in power plant circuit, it is characterised in that including：Main transformer (1), its high-pressure side are connected with 220kV or 500kV high voltage distribution installations, some main transformers (1) It is connected with 220kV or 500kV high voltage distribution installations；Generating set house transformer (2), its high-pressure side are connected with the main transformer (1) low-pressure side, some generatings Unit auxiliary transformer (2) high-pressure side is connected with some main transformer (1) low-pressure sides respectively, the generating set station-service Transformer (2) low-pressure side is connected with the second breaker (5) end of incoming cables, the second breaker (5) leading-out terminal and the 3rd breaker (6) end of incoming cables connects, and the 3rd breaker (6) leading-out terminal is connected with stand-by power supply, the second breaker (5) leading-out terminal with 3rd breaker (6) end of incoming cables is accessed on 6kV section buses；Generator (3), it is connected with the low-pressure side of some main transformers (1)；First breaker (4), it is arranged on the generator (3) outlet, the generator (3) outlet set some it is in parallel First breaker (4), the first breaker (4) end of incoming cables are connected with the generator (3), and first breaker (4) goes out Line end accesses main transformer (1) low-pressure side.
- 2. large-sized unit electric main power connection in power plant circuit according to claim 1, it is characterised in that the main transformer (1) it is two, the generating set house transformer (2) is two, and first breaker (4) is two.
- 3. large-sized unit electric main power connection in power plant circuit according to claim 1, it is characterised in that the main transformer (1) it is the three-phase transformer of star-delta connection.
- 4. large-sized unit electric main power connection in power plant circuit according to claim 1, it is characterised in that the generating set factory It is the three-phase transformer that star-delta connects with transformer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720527611.0U CN206727653U (en) | 2017-05-12 | 2017-05-12 | A kind of large-sized unit electric main power connection in power plant circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720527611.0U CN206727653U (en) | 2017-05-12 | 2017-05-12 | A kind of large-sized unit electric main power connection in power plant circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206727653U true CN206727653U (en) | 2017-12-08 |
Family
ID=60510097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720527611.0U Expired - Fee Related CN206727653U (en) | 2017-05-12 | 2017-05-12 | A kind of large-sized unit electric main power connection in power plant circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206727653U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224750A (en) * | 2021-04-28 | 2021-08-06 | 中国能源建设集团广东省电力设计研究院有限公司 | Novel high-voltage standby power supply leading method of gas-steam combined cycle power station |
-
2017
- 2017-05-12 CN CN201720527611.0U patent/CN206727653U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224750A (en) * | 2021-04-28 | 2021-08-06 | 中国能源建设集团广东省电力设计研究院有限公司 | Novel high-voltage standby power supply leading method of gas-steam combined cycle power station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171208 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |