Power Transformer with Dual Electrostatic Screens

Abstract

A power transformer with double electrostatic screens relates to a transformer. At present, the cylindrical coil structure adopted by the 35kV power transformer, when the high-voltage coil winding is D-connected, the winding insulation is easily broken down during overvoltage, and there are hidden dangers at the end of the outgoing line. The present invention includes a high-voltage coil winding, which is characterized in that: the inner side and the outer side of the high-voltage coil winding are respectively provided with a first electrostatic screen and a second electrostatic screen, and the first electrostatic screen, the second electrostatic screen and the head end of the high-voltage coil winding connected. In this technical solution, when the high-voltage coil winding is D-connected, the overvoltage borne by the head and the end of the high-voltage coil winding can be reduced by the two devices of the electrostatic screen to reduce the high voltage on the start and end, improve the electric field distribution, and transform the transformer The head and the end of the high-voltage coil winding are connected as a whole to ensure the stability and reliability of the high-voltage coil winding. The structure is simple and easy to operate, and the product performance is improved without affecting the appearance of the transformer and other internal structures.

Description

technical field [0001] The present invention relates to a transformer. Background technique [0002] At present, the cylindrical coil structure adopted by the 35kV power transformer only installs an electrostatic screen between the high-voltage coil winding and the low-voltage coil of the transformer to prevent the end of the high-voltage coil winding from excessive voltage and high temperature rise under high voltage conditions. This structure is completely applicable to Y-connected transformers, but it is not perfect for D-connected transformers. When the high-voltage coil winding is D-connected, the end and the beginning of the high-voltage coil winding are at the same high voltage potential. When the winding insulation is overvoltage, it is easy to be broken down, and there is a hidden danger at the end of the outgoing line. Contents of the invention [0003] The technical problem to be solved and the technical task proposed by the present invention are to perfect and...

AI Technical Summary

Problems solved by technology

This structure is completely applicable to Y-connected transformers, but not perfect for D-connected transformers

When the high-voltage coil winding is D-connected, the end and the beginning of the high-voltage coil winding are at the same potential at high voltage. When the winding insulation is overvoltage, it is easy to be broken down, and there are hidden dangers at the end of the outgoing line.

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