Real-time monitoring method of short-circuit current in near-area of ​​transformer

Abstract

The invention relates to a real-time monitoring method for short-circuit current in the vicinity of a transformer. The three-phase non-inductive resistor connected in series on the three-phase current transformer on the secondary side of the transformer passes the collected analog signal through an isolation amplifier, a low-pass filter, an absolute The value conversion unit and the range adaptive unit are sent to the A / D sampling unit, and the A / D sampling unit continuously collects analog signals, and the first processor performs calculations on the read current sampling data, and screens and obtains the current effective value and current mutation of the waveform The instantaneous value of the fault is measured, and the fault data at the time of the fault is cached in the dual-port memory. The second processor receives the fault data of the dual-port memory and communicates with the host computer through the network interface to draw a waveform diagram. At the same time, the second processor The fault data is counted and stored in a large-capacity memory. The invention collects, records and analyzes the short-circuit impact current on the secondary side of the transformer, and can provide accurate basis for the analysis and maintenance of the transformer operation status.

Description

technical field [0001] 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 [0002] 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 is short-circuited at the outlet and near the low-voltage side, the transformer winding will bear a considerable current, which will affect its health; each short-circuit current will form a cumulative effect on the transformer winding, forming latent damage. Short circuit is a necessary inspection item. At present, the detection of short circuit in the near area of ​​the transform...

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 accurately provide a basis for the analysis and maintenance of the transformer's operating conditions

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