CN214755547U

CN214755547U - Factory power supply leading structure of power plant

Info

Publication number: CN214755547U
Application number: CN202120501696.1U
Authority: CN
Inventors: 任洪涛; 吴海峰; 田玉柱
Original assignee: PowerChina Huadong Engineering Corp Ltd
Current assignee: PowerChina Huadong Engineering Corp Ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-11-16
Anticipated expiration: 2031-03-09

Abstract

The utility model provides a factory power supply leading structure of a power plant, which comprises 1# and 2# generator outlet circuit breakers, 1# and 2# factory branch isolating switches and 1# and 2# factory branch grounding switches; the 1# generator is connected with the 1# generator outlet circuit breaker, the 1# generator outlet circuit breaker is connected with the 1# service branch disconnecting switch, and the 1# service branch disconnecting switch is connected with the 1# service branch grounding switch; the 2# generator is connected with the 2# generator outlet circuit breaker, the 2# generator outlet circuit breaker is connected with the 2# service branch isolating switch, the 2# service branch isolating switch is connected with the 2# service branch grounding switch, and the 1# and 2# service branch isolating switches are connected with the service branch circuit breaker; the other end of the service branch breaker is connected with a service transformer. The utility model has high reliability of the station transformer power supply; the number of station transformers is small, and the operation switching logic is simple; the equipment investment of the auxiliary power system is economical.

Description

Factory power supply leading structure of power plant

Technical Field

The utility model relates to a power plant distribution field especially relates to a power plant factory uses power to draw and connects structure.

Background

The station power supply of a power plant is usually led from an outlet of a generator, and generally one generator is provided with a station transformer for station power supply. However, for power plants with more generators (8 and more), the requirement on the reliability of service power is higher, if each generator outlet is provided with a service transformer, the service power operation logic is more complex, the cost is high, meanwhile, misoperation is easy to occur, the short-circuit current of a service power bus is increased, and the equipment cost of a service power system is increased. Therefore, the method for leading off the industrial power with compromise has practical value.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a power plant factory uses power to draw and connects structure, investment economy just can improve the station transformer power reliability. The utility model adopts the following technical scheme.

The utility model provides a power plant service power draws and connects structure which characterized in that includes 1# generator, 2# generator, 1# generator export circuit breaker, 2# generator export circuit breaker, 1# branch isolator for the factory, 2# branch isolator for the factory, 1# branch earthing switch for the factory, 2# branch earthing switch for the factory, branch circuit breaker for the factory, transformer for the factory. The 1# generator is connected with a 1# generator outlet circuit breaker, the 1# generator outlet circuit breaker is connected with a 1# service branch isolating switch, and the 1# service branch isolating switch is connected with a 1# service branch grounding switch; the 2# generator is connected with a 2# generator outlet circuit breaker, the 2# generator outlet circuit breaker is connected with a 2# factory branch isolating switch, the 2# factory branch isolating switch is connected with a 2# factory branch grounding switch, and the 1# factory branch isolating switch and the 2# factory branch isolating switch are connected with a factory branch circuit breaker; and the other end of the service branch circuit breaker is connected with a service transformer.

Further, the service transformer can be a dry type transformer or an oil-immersed type transformer.

Further, the 1# factory branch isolating switch and the 1# factory branch grounding switch can not be closed simultaneously, and the 1# factory branch isolating switch and the 2# factory branch grounding switch can not be closed simultaneously.

Further, the 2# factory branch isolating switch and the 1# factory branch grounding switch can not be closed simultaneously, and the 2# factory branch isolating switch and the 1# factory branch grounding switch can not be closed simultaneously.

Further, in the power plant, the above structure can be adopted for every two generators in a group, that is, the 1# generator and the 2# generator are the first generator and the second generator in every two generators of the power plant.

The utility model discloses it is to have following beneficial effect at least:

1. the two generators supply power for one station transformer, and the reliability of the station transformer power supply is high;

2. the number of station transformers is small, and the operation switching logic is simple;

3. the short-circuit current of the auxiliary power is basically the same as that of the leading connection of a single machine, and the equipment investment of the auxiliary power system is not increased.

Drawings

Fig. 1 is a wiring structure diagram of the present invention.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to the drawings, wherein, 1# generator 1 and 2# generator 2 are two generators in the power plant, the utility model provides a power plant is with power draw and is connect structure includes 1# generator outlet circuit breaker 3, 2# generator outlet circuit breaker 4, 1# branch isolator 5, 2# branch isolator 6, 1# branch earthing switch 7, 2# branch earthing switch 8, branch circuit breaker 9, transformer 10 are used to the mill.

The 1# generator 1 is connected with a 1# generator outlet circuit breaker 3, the 1# generator outlet circuit breaker 3 is connected with a 1# service branch isolating switch 5, and the 1# service branch isolating switch 5 is connected with a 1# service branch grounding switch 7; the 2# generator 2 is connected with a 2# generator outlet circuit breaker 4, the 2# generator outlet circuit breaker 4 is connected with a 2# service branch isolating switch 6, the 2# service branch isolating switch 6 is connected with a 2# service branch grounding switch 8, and the 1# service branch isolating switch 7 and the 2# service branch isolating switch 8 are connected with a service branch circuit breaker 9; and the other end of the service branch circuit breaker is connected with a service transformer 9.

The service transformer 10 is a dry transformer.

The 1# factory branch isolating switch 5 and the 1# factory branch grounding switch 7 can not be closed simultaneously, and the 1# factory branch isolating switch 5 and the 2# factory branch grounding switch 8 can not be closed simultaneously.

The 2# factory branch isolating switch 6 and the 1# factory branch grounding switch 8 can not be closed simultaneously, and the 2# factory branch isolating switch 6 and the 1# factory branch grounding switch 7 can not be closed simultaneously.

In the power plant, every two generators can adopt the structure in groups, and one transformer is correspondingly connected with the two generators.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, i.e. all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention, which is not illustrated herein.

Claims

1. A factory power supply leading structure of a power plant is characterized by comprising a 1# generator outlet circuit breaker, a 2# generator outlet circuit breaker, a 1# factory branch isolating switch, a 2# factory branch isolating switch, a 1# factory branch grounding switch, a 2# factory branch grounding switch, a factory branch circuit breaker and a factory transformer, wherein the 1# generator and the 2# generator are two generators of the power plant; the 1# generator is connected with a 1# generator outlet circuit breaker, the 1# generator outlet circuit breaker is connected with a 1# service branch isolating switch, and the 1# service branch isolating switch is connected with a 1# service branch grounding switch; the 2# generator is connected with a 2# generator outlet circuit breaker, the 2# generator outlet circuit breaker is connected with a 2# factory branch isolating switch, the 2# factory branch isolating switch is connected with a 2# factory branch grounding switch, and the 1# factory branch isolating switch and the 2# factory branch isolating switch are connected with a factory branch circuit breaker; and the other end of the service branch circuit breaker is connected with a service transformer.

2. The power plant service power supply tapping structure of claim 1, wherein said service transformer is a dry transformer or an oil-immersed transformer.

3. The power plant service power leading structure as claimed in claim 1, wherein the 1# service branch isolating switch is not closed simultaneously with the 1# service branch grounding switch, and the 1# service branch isolating switch is not closed simultaneously with the 2# service branch grounding switch.

4. The power plant service power leading structure as claimed in claim 1, wherein the # 2 service branch isolating switch is not closed simultaneously with the # 1 service branch grounding switch, and the # 2 service branch isolating switch is not closed simultaneously with the # 1 service branch grounding switch.

5. The power plant service power leading structure of claim 1, wherein the 1# generator and the 2# generator are a first generator and a second generator of every two generators of the power plant.