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Relay protection method of blocking filter mistermination failure

A blocking filter and relay protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as less installation of SBF, SBF detuning protection, and lack of clear technical regulations

Inactive Publication Date: 2013-05-15
DATANG INT POWER GENERATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, SBFs are rarely installed in generator sets of domestic power plants, and there is no clear technical regulation on how to perform detuning protection for SBFs. This invention is proposed based on the current technical vacancies.

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  • Relay protection method of blocking filter mistermination failure
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  • Relay protection method of blocking filter mistermination failure

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Embodiment Construction

[0045] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] The invention provides a relay protection method for blocking filter detuning faults, comprising the following steps:

[0047] (1) The relay protection device samples the current of each group of shunt reactors and capacitors in the blocking filter (SBF), and samples the current flowing into the entire SBF;

[0048] (2) After the full-cycle Fourier numerical filtering algorithm, calculate the amplitude of each reactor current and capacitor current, and calculate the amplitude of the current flowing into the SBF;

[0049] (3) Calculate the ratio of the current amplitude of each group of shunt reactors to the current amplitude of the capacitor;

[0050](4) When the current amplitude flowing into the SBF is large enough, if the current ratio exceeds the preset range, an alarm signal or a trip signal will be sen...

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Abstract

The invention discloses a relay protection method of blocking filter mistermination failure. The method comprises the steps that current sampling is carried out on each group of paralleling reactors and a capacitor in a static blocking filter (SBF) by a replay protection device and a current flowing into the whole SBF is sampled; amplitude values of the current of each reactor and the current of the capacitor and the amplitude value of the current flowing into the SBF are calculated by means of the full cycle Fourier numerical filtering algorithm; ratios of the amplitude value of the current of each reactor current and the amplitude value of the current of each capacitor are calculated; and when the amplitude value of the current flowing into the SBF is big enough and the current ratio is beyond a pre-determined scope, an alarming signal or a tripping signal is sent out after a delay and a tripping relay idle contact is output. According to the relay protection method of the blocking filter mistermination failure, only currents of each reactor and the capacitor of the blocking filter and the current flowing into the blocking filter need to be measured, and wiring is simple. The full cycle Fourier algorithm only reflects power frequency weight in electrical quantity. The method is simple and reliable.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a relay protection method for detuning faults of blocking filters. Background technique [0002] For the transmission mode of long-distance power transmission and equipment such as series capacitor compensation in the transmission line, when the parameters are not correct, subsynchronous oscillation of the generator set may occur, and in severe cases, the main shaft of the generator set may be damaged, causing the main shaft to be sprained. In order to suppress subsynchronous oscillation, there are many technical means, one of which is to install a blocking filter on the high voltage side of the main transformer to increase the subsynchronous damping of the power transmission network to prevent and suppress the occurrence of subsynchronous oscillation. [0003] For example, the Inner Mongolia Datang Tuoketuo Power Plant in my country has an installed capacity of 8×600MW, which is tra...

Claims

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Application Information

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IPC IPC(8): H02H7/22
Inventor 佟义英张仁伟孟为群沈全荣严伟陈俊张琦雪
Owner DATANG INT POWER GENERATION
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