Transformer close-in short-circuit current monitoring method

Abstract

The invention relates to a transformer close-in short-circuit current monitoring method. Collected analog signals are transmitted by a three-phase non-inductive resistor connected to a three-phase current transformer on the secondary side of a transformer in series to an A / D sampling unit by passing through a signal isolation amplifier, a low pass filter, an absolute value converting unit and a range self-adaptive unit, the A / D sampling unit continuously collects the analog signals, a first processor calculates read current sampling data, the waveform current effective value and the fault instantaneous value of current break variable are obtained in a screed mode, the fault data at the fault occurrence moment is cached in a dual-port memory, a second processor receives the fault data of the dual-port memory and is in communication with an upper computer through a network interface for drawing an oscillogram, and meanwhile the second processor carries out statistics on the received fault data and stores the data to a large-capacity memory. By means of the method, the short-circuit impulse current on the secondary side of the transformer can be collected, recorded and analyzed, and an accurate basis can be provided for analysis and overhaul of transformer operation conditions.

Description

[0001] This application is a divisional application of the invention patent application with the application number: 201210068241.0, the title of the invention is "Real-time Monitoring Method for Short-Circuit Current of Transformers", and the application date is: March 15, 2012. technical field [0002] The invention relates to a real-time monitoring method for near-area short-circuit current of a transformer, and belongs to the technical field of short-circuit current monitoring for near-area transformers. Background technique [0003] As the core equipment of the power grid, the power transformer is crucial to the safe and reliable operation of the power grid. Only by accurately analyzing and judging transformer faults can timely and effective measures be taken to ensure the normal operation of the power grid and normal power supply to users. After the 110kV transformer suffers from outlet short-circuit and short-circuit near the low-voltage side, the transformer winding ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned detection is complicated, because it is impossible to provide the magnitude and number of short-circuit electrical shocks on the secondary side of the transformer, so it cannot provide accurate basis for the analysis and maintenance of the transformer operation status

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