Generator power transmitting device and transmitting method based on differential current fault identification

Abstract

The invention discloses a generator power transmitting device and transmitting method based on differential current fault identification. The method comprises the following steps: to begin with, collecting a generator terminal voltage transformer three-phase voltage, a generator terminal measuring level current transformer three-phase current and a generator terminal protection level current transformer three-phase current in real time; calculating fundamental wave vector of the generator terminal voltage transformer three-phase voltage, fundamental wave vector of the generator terminal measuring level current transformer three-phase current, fundamental wave vector of the generator terminal protection level current transformer three-phase current, generator power 1, generator power 2 and differential current amplitude formed by the generator terminal protection level current transformer three-phase current and the measuring level current transformer three-phase current; and through a differential current fault identification criterion, if criterion function is input and the criterion is met, outputting the generator power 2, or otherwise, outputting the generator power 1. The method can improve fault identification criterion sensitivity under the generator light-load condition, thereby preventing the problem that since the measuring level CT is easy to saturate, error power is output.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a generator power transmission device and a transmission method based on differential current fault identification. Background technique [0002] The traditional generator power transmitter collects the generator terminal voltage and the current transformer current of the machine terminal measurement level, and uses the time division multiplier principle to generate an analog power signal, which is supplied to the distributed control system (DCS) of the unit and the digital electro-hydraulic control of the steam turbine. system (DEH) used. When a fault occurs outside the unit area or an adjacent transformer runs out, due to factors such as a large fault current or non-periodic components, the current waveform of the measuring-level current transformer at the generator end is distorted, resulting in the power transmitter being unable to be true. Respond to the current pow...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a generator power transmission device and transmission method based on differential current fault identification, which can improve the sensitivity of fault identification criteria under light load conditions of generators, and can effectively solve the problem of measurement-level CT faults. Problems with saturation causing wrong power output

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