High-reliability deexcitation apparatus used for hydro-turbo generator set

A technology of generator set and de-excitation device, which is used in the control of generators, emergency protection circuit devices, electrical components, etc., can solve problems such as false strong excitation, switch refusal, and increase in the number of de-excitation switch actions, and achieve reliable de-excitation. Effect

Inactive Publication Date: 2009-05-13
白山发电厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the anode voltage can be as high as 1300 volts and the commutation peak voltage can be as high as 4200 volts, the excitation system often has problems, causing false strong excitation, resulting in an increase in the number of de-excitation switch operations
Therefore, many problems such as the refusal of the switch itself are exposed.

Method used

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  • High-reliability deexcitation apparatus used for hydro-turbo generator set
  • High-reliability deexcitation apparatus used for hydro-turbo generator set
  • High-reliability deexcitation apparatus used for hydro-turbo generator set

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing:

[0021] Such as figure 1 As shown, this embodiment includes a three-phase fully-controlled rectifier bridge, a demagnetization switch and zinc oxide resistors connected in parallel at both ends of the generator rotor. Among them: the input end of the three-phase fully-controlled rectifier bridge is connected to the secondary side of the excitation transformer, the primary side of the excitation transformer is connected to the stator end of the generator, and the output end of the three-phase fully-controlled rectifier bridge is connected to the rotor end of the generator through the de-excitation switch , and form a closed loop. The residual voltage of the zinc oxide resistor is lower than the anode voltage of the AC side of the three-phase fully-controlled rectifier bridge.

[0022] Due to the excellent nonlinear volt-ampere characteristics of high-energy zinc oxide (ZnO)...

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Abstract

The invention provides a demagnetization device, in particular to a demagnetization device which has high reliability and is used for a water-turbine generator set. The device includes a three-phase full controlled rectifier bridge, a demagnetization switch, and a zinc oxide resistance which is connected with two ends of a generator rotor in parallel, wherein, the input terminal of the three-phase full controlled rectifier bridge is connected with the side edge of an excitation transformer; the original edge of the excitation transformer is connected with a generator stator end; and the output terminal of the three-phase full controlled rectifier bridge is connected with a generator rotor end by the demagnetization switch. The residual voltage of the zinc oxide resistance is smaller than the anode peak voltage at the AC side of the three-phase full controlled rectifier bridge. During normal demagnetization, the zinc oxide resistance is opened for demagnetization depending on the anode peak voltage of the three-phase full controlled rectifier bridge, and the demagnetization switch helijumps, therefore, no damage is caused to the contact thereof and an arc-extinguishing system, and the demagnetization without damage can be realized.

Description

technical field [0001] The invention relates to a demagnetization device, in particular to a high-reliability demagnetization device for a hydroelectric generating set. Background technique [0002] The so-called demagnetization system is the process of weakening the magnetic field energy generated by the excitation current in the rotor winding of the generator to as small as possible as soon as possible when the internal failure of the generator set is allowed by the rotor insulation. When a short circuit occurs inside the generator set or a short circuit fault occurs outside the generator, the demagnetization system can quickly reduce the induction potential of the generator and reduce the loss caused by the fault. The main requirement for the generator demagnetization system is to reliably and quickly consume the magnetic field energy stored in the generator, and at the same time limit the high overvoltage generated at both ends of the excitation winding to protect the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/06H02P9/12
Inventor 刘守茹刘贵仁梁卫宁李振马跃林杨卫东程秀清
Owner 白山发电厂
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