CN2185918Y

CN2185918Y - Built-in power transformer for lightning arrester

Info

Publication number: CN2185918Y
Application number: CN 93247114
Authority: CN
Inventors: 何有水; 张家骞; 林灿华; 毛健元; 沈向东
Original assignee: Wujiang Transformer Factory Co Ltd
Current assignee: Wujiang Transformer Factory Co Ltd
Priority date: 1993-12-07
Filing date: 1993-12-07
Publication date: 1994-12-21
Anticipated expiration: 2003-12-07

Abstract

The utility model relates to a lightning stroke-preventing power transformer whose high-voltage side and low-voltage side are respectively provided with zinc-oxide arresters which are arranged in the body of the transformer; when the zinc-oxide arrester is subjected to a lightning stroke, the high voltage of the lightning cause the zinc-oxide arrester to be quickly conducted; the lightning flows into the ground. The arrester is installed in the body of the transformer, reducing the influence, on the arrester, which is given by the outside adverse environment, extending the long service life, increasing the operational reliability of the transformer, and enhancing the lightning stroke-preventing performance of the transformer, and the damage ratio of the lightning stroke can be reduced to 0.1%.

Description

Built-in power transformer for lightning arrester

The utility model belongs to a kind of anti-lightning strike power transformer.

Existing power transformer is reduced the loss for anti-lightning strike, generally in the high-pressure side of transformer zinc oxide arrester is installed." a kind of distribution transformer that the has lightning proof " patent (patent No. 89105752.8) of Hunan Province Jishou City Qin Xiang circle application is except that the transformer high-voltage side is installed zinc oxide arrester, also one group of increase is identical with the low pressure winding number of phases on iron core, around to opposite balance winding, to improve the anti-lightning strike adaptability and the detecting reliability of transformer, but it is external that the zinc oxide arrester of the power transformer that these are anti-lightning strike is installed in transformer, the lightning arrester lead-in wire is long, existence causes the big defective of residual voltage because of inductive drop, also be difficult to overcome of the influence of outside adverse circumstances, cause shorten useful life lightning arrester.

The purpose of this utility model provides a kind ofly can further reduce the thunderbolt spoilage, reduce maintenance workload to lightning arrester, improve operational reliability, save the anti-lightning strike power transformer of cost.

The technical solution of the utility model is in the high-pressure side of power transformer and low-pressure side zinc oxide arrester (1), (2) to be installed respectively, and is placed in the transformation body; One end of on high-tension side each lightning arrester (1) is connected with the end of incoming cables of the every single line of high pressure winding (3), and lightning arrester (1) other end connects together and is connected to earth terminal (5) altogether; One end of each lightning arrester (2) of low-pressure side is connected with the leading-out terminal of each phase line of low pressure winding (4), and lightning arrester (2) other end links to each other with the neutral point of low pressure winding (4) and is connected to earth terminal (5) altogether.

In order to make zinc oxide arrester can adopt zero-clearance zinc oxide lightning arrester at the warm medium-term and long-term steady operation of heating oil of power transformer.

The utility model when being struck by lightning, when lightning wave from the high-pressure side or low-pressure side phase line when entering, the thunder and lightning high pressure makes zinc oxide arrester (1) or (2) conducting rapidly, lightning current goes into ground by lightning arrester.Because lightning arrester is placed in the transformation body, both eliminate lightning arrester and be contained in the external influence that causes the long generation inductive drop of lead-in wire of transformer, avoid residual voltage excessive, alleviated of the influence of outside adverse circumstances again to lightning arrester, increase the service life, improved the transformer operational reliability, strengthened the anti-lightning strike performance of transformer, the thunderbolt spoilage can be reduced to 0.1% by original 0.7%.

Fig. 1 is a circuit interconnect pattern of the present utility model.

1 is transformer high-voltage side zinc oxide arrester among the figure, and 2 is the low-pressure side zinc oxide arrester, and 3 is the transformer high-voltage winding, and 4 is the transformer low voltage winding, and 5 is earth terminal.

Embodiment of the present utility model is at Y, 10 kilovolts of sides in the yno tie lines transformer are installed zero-clearance zinc oxide lightning arrester Y5W-12.7,400 volts of sides zero-clearance zinc oxide lightning arrester Y3W-0.28 is installed, adopts epoxy encapsulation on the structure, place in the transformation body.

Claims

1, a kind of anti-lightning strike power transformer is made up of transformer and zinc oxide arrester, it is characterized in that the high-pressure side of transformer and low-pressure side are equipped with zinc oxide arrester respectively, and places in the transformation body; One end of on high-tension side each lightning arrester is connected with the end of incoming cables of each phase line of high pressure winding, and the lightning arrester other end connects together and is connected to earth terminal altogether; One end of each lightning arrester of low-pressure side is connected with the leading-out terminal of each phase line of low pressure winding, and the lightning arrester other end links to each other with the neutral point of low pressure winding and is connected to earth terminal altogether.

2, by the described power transformer of claim 1, it is characterized in that zinc oxide arrester is a zero-clearance zinc oxide lightning arrester.