Heating protective structure for gas insulated transformer in low-temperature environment

Abstract

The invention relates to a heating protective structure for a gas insulated transformer in a low-temperature environment, belonging to the technical field of transformers. According to the technical scheme, the heating protective structure comprises a high-voltage cable box (1) and an instrument box (2), wherein a cable box heating protective device comprises an aluminum plate (3), a heat preservation layer (4), a heater I (5) and a temperature sensor (6), the aluminum plate is of a cylinder shape to be used as a supporting cylinder being arranged on the high-voltage cable box, silicon rubber is filled inside the cylindrical aluminum plate as the heat preservation layer, the heater is arranged in the most interior layer of the cylindrical aluminum plate, and the temperature sensor is pre-embedded in the most interior layer of the cylindrical aluminum plate; and an instrument box heating protective device comprises a heater II (7) and a temperature controller (8), and the heater II and the temperature controller are arranged in the instrument box. The heating protective structure has the positive effects that a temperature in the cable box is maintained above minus 20 DEG C, normal work of gas in the high-voltage cable box is guaranteed, according to the instrument box heating protective device, a working temperature in the instrument box is normal, and the requirement on normal operation of the gas insulated transformer in the low-temperature environment of minus 40 DEG C is satisfied.

Description

technical field [0001] The invention relates to a heating protection structure of a gas insulated transformer in a low temperature environment, belonging to the technical field of transformers. Background technique [0002] In a low temperature environment, for example, the annual minimum temperature in the Harbin area in Northeast my country is minus 40°C or below, and the transformer is required to have the ability to operate normally in a low temperature environment. For transformers with SF6 gas as the insulating medium, the pressure of SF6 gas in the transformer body is 0.14Mpa when the ambient temperature is 20°C, and the pressure in the high-voltage cable box is 0.4MPa. When the ambient temperature drops to minus 40°C, the transformer body is It can operate normally, but because there is no heat generated in the cable box, the gas in the cable box will be liquefied under the influence of low temperature, and it will not play the role of gas insulation. In addition, t...

AI Technical Summary

Problems solved by technology

In addition, the gas density gauge and thermometer used in the transformer body, high-voltage cable box and switch are only allowed to be used at temperatures above minus 20°C.

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