Low-temperature-resistant low-frequency heating device for transformers

Abstract

The invention discloses a low-temperature-resistant low-frequency heating device for transformers. The low-temperature-resistant low-frequency heating device for the transformers comprises a rectifying module, a filtering capacitor, an inversion module, a temperature measurement unit, a control element, a heating element and a cooling element, wherein the rectifying module, the filtering capacitor and the inversion module form a low-frequency heating device body, the heating element and the cooling element are connected with the control element, the output ends of the heating element and the cooling element are connected with the low-frequency heating device body, the temperature measurement unit is used for detecting temperatures of the rectifying module, the filtering capacitor and the inversion module and sending temperature information to the control element, the control element is used for displaying temperature values and sending control signals, and the heating element and the cooling element are used for heating or cooling the low-frequency heating device body according to the control signals. The low-temperature-resistant low-frequency heating device for the transformers can be used for start and operation of the transformers in high-cold and even gelid environments.

Description

technical field [0001] The invention belongs to the field of high-voltage equipment, and more specifically relates to a low-frequency transformer low-frequency heating device with low temperature resistance. Background technique [0002] UHV converter transformers are complex in structure, difficult to design and manufacture, and require higher installation techniques. At present, the insulation drying methods that can be used at the transformer installation site at home and abroad include vacuum hot oil circulation method, short-circuit current method, zero-sequence current method, eddy current heating method, steam heating method, etc. Among them, the low frequency heating method (low frequency heating, LFH) uses a lower voltage to short-circuit the heating of the winding. In the late 1980s, companies such as ABB began to use low-frequency current to vacuum dry the transformer, and studied the effect of low-frequency heating temperature on different The drying effect of t...

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Problems solved by technology

[0004] At present, some units and research institutions in China are conducting research on transformer low-frequency heating devices. The existing technology discloses the basic composition of transformer insulation and drying low-frequency heating power supplies, but the weather resistance configuration of transformer insulation and drying low-frequency heating power supplies still needs to be improved. Can be applied to the harsh climate environment on site

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