Transformer system current phasor test system and method based on low frequency excitation response

Abstract

The invention discloses a current phasor test method of a transformer system based on low-frequency excitation response, which includes short-circuiting the three-phase grounding of the high-voltage side of the transformer, applying a low-frequency steady-state current of 10-25 Hz between phases at the low-voltage side of the transformer, and recording the transformer with a wave recorder. High and low voltage side related protection, measurement and control and other secondary equipment current, through waveform data analysis, determine the phasor information such as current amplitude and phase, and then judge the correctness of the polarity and transformation ratio of the current transformer. The invention reduces the test capacity requirements of the flow-through equipment, effectively solves the problem that the transformer cannot carry out one-time flow-through, and can solve the problem that the differential protection of the transformer using bushing CT cannot pass flow to verify the correctness of the differential protection circuit under static conditions. The transformer no-load phasor test provides a solution, saves the time and cost of power transmission debugging, does not need to disconnect the main wiring once, the test wiring is convenient, the waveform analysis frequency adaptability is good, the flow time is short, safe and reliable, and the accuracy is high.

Description

Technical field [0001] The present invention belongs to the field of power debugging and power test, and is specifically related to a transformer system current-phase amount test method based on a low-frequency excitation response. Background technique [0002] In order to systematically check the correctness of a dual-equipment current sampling system before starting power generation, the site usually carries a flow test to the switch, busbar and other equipment, especially for the high-pressure start-up transformer in the power plant, due to the electric power supply In the commissioning phase, the construction and installation progress of the factory is often lagged behind. Many downstream load equipment do not have power-saving conditions. It is difficult to organize enough loads to carry out protective belt load phases testing, and cannot ensure that transformer protection is 100% correctly. It affects the safety and stable operation of the transformer, so it is necessary to...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a transformer system current phasor test method based on low-frequency excitation response, which effectively solves the problem that the transformer cannot carry out primary current flow, and can solve the problem of transformer differential protection under static conditions using bushing CT. Unable to verify the correctness of the differential protection circuit through flow

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