Short-circuit ice melting method by means of raising voltage and current from zero for small hydropower station

Abstract

A short-circuit ice melting method by means of raising voltage and current from zero for a small hydropower station includes that an electric connection mode of a step-up transformer of the small hydropower station is changed, so that the step-up transformer can be used as a step-down transformer; the step-down transformer is combined with a generator, which has a function of raising the current from zero, of the small hydropower station; the generator (1) of the small hydropower station is electrically connected with a high-voltage end of the step-down transformer (2); one end of an iced conducting wire (3) is electrically connected with a low-voltage end of the step-down transformer (2); the other end of the iced conducting wire (1) is subjected to three-phase short circuit to form a three-phase short-circuit point (4); and a grounding knife switch (5) is arranged at the other end of the iced conducting wire (3). The short-circuit ice melting method has the advantages that a control mode of an excitation system of the generator (1) of the small hydropower station is set as a manual fixed-current mode, a magnetic blow-out switch of the generator (1) of the small hydropower station is switched on to manually excite the generator, ice-melting current of the iced conducting wire (3) is gradually increased, and accordingly the purpose of melting ice is achieved.

Description

technical field [0001] The present invention relates to a short-circuit ice-melting method for small hydropower stations with boosting voltage and current from zero, and specifically relates to using the step-up transformer of a small hydropower station as a step-down transformer. The ice-coated wire is connected, the end of the ice-coated wire is short-circuited in three phases, and the line current is gradually increased to a certain value by slowly increasing the excitation current of the generator, so that the line heats up and melts the ice. Background technique [0002] In recent years, the number of icing disasters caused by transmission lines has increased, the scale has expanded, and the damage has increased, which has brought a huge impact on the normal operation of the power grid and people's living standards. [0003] In order to solve the problem of icing on transmission lines in winter, which seriously threatens the safe operation of power systems, a lot of res...

AI Technical Summary

Problems solved by technology

However, the structure of the controllable rectification device is relatively complicated; the harmonic content is high and the reactive power loss is large during operation, so it is necessary to configure an AC filter with a certain capacity for reactive power compensation and filtering; and it is necessary to configure responsive protection equipment, which requires a considerable investment

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