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Raising-from-zero current short-circuit ice-melting method for small hydropower plants

A technology for small hydropower and small hydropower stations, applied in the installation of electrical components, cables, overhead installation, etc., can solve the problems of large reactive power loss, large investment and high harmonic content, achieve low cost of ice melting, avoid impact, operation simple effect

Inactive Publication Date: 2013-08-07
KAILI POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Raising-from-zero current short-circuit ice-melting method for small hydropower plants

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Embodiment Construction

[0024] combine figure 1 As shown, the present invention is further described in detail.

[0025] Such as figure 1 As shown, electrically connect the small hydropower generator (1) to one end of the ice-coated wire (2), and connect the other end of the ice-coated wire (2) to form a three-phase short-circuit point (3), and install Ground knife turns (4).

[0026] Set the control mode of the excitation system of the small hydroelectric generator (1) to manual constant current mode, close the de-excitation switch of the small hydroelectric generator (1) to manually excite the generator, and pay attention to observe the machine terminal of the small hydroelectric generator (1) stator current. In order to prevent the generator voltage from suddenly rising due to uncontrollable factors during the test, causing equipment damage, the overvoltage protection setting of the generator should be reduced to 1.1 times the rated value, and the action time should be changed to 0s.

[0027] ...

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Abstract

Disclosed in a raising-from-zero current short-circuit ice-melting method for small hydropower plants. The method includes that by utilizing a raising-from-zero current function of a small hydropower generator. The small hydropower generator (1) is electrically connected with one end of an iced conductor (2), a three-phase short-circuit point (3) is formed through a three-phase short circuit at the other end of the iced conductor (3), a grounding switch (4) is mounted at the other end of the iced conductor (3), the control mode of an excitation system of the small hydropower generator (1) is set as a manual current setting mode, and a field suppression switch of the small hydropower motor (1) is switched on to manually exciting the power generator to gradually increase ice melting current of the iced conductor (2) so as to realize ice melting.

Description

technical field [0001] The present invention relates to a small hydropower zero-start upflow short-circuit ice-melting method, in particular to three-phase short circuit at the end of the ice-coated wire, and the other end is used as the ice-melting power source by the zero-start upflow of the generator of the small hydropower station, on the ice-coated wire 1. When the generators are connected to form an electrical circuit, gradually increase the line current to a certain value by slowly increasing the excitation current of the generator, so as to make the line heat and melt 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 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G7/16
Inventor 许良柱吴建国朱勇杨彬陈荣
Owner KAILI POWER SUPPLY BUREAU
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