Real-time monitoring method for short-circuit current of near zone of transformer

Abstract

The invention relates to a real-time monitoring method for short-circuit current of a near zone of a transformer, and the real-time monitoring method is characterized in that three non-inductive resistors connected in series onto three current transformators at the secondary side of the transformer are used for sending acquired analog signals to an analog / digital (A / D) sampling unit through an isolation amplifier, a low-pass filter, an absolute converting unit and a range self-adaption unit; the A / D sampling unit is used for continuously acquiring the analog signals; a first processor is used for computing read current sampled data, screening to obtain a wavelike current effective value and the fault instantaneous value of break-variable of current and caching fault data at the fault occurrence moment to a dual ported memory; a second processor is used for receiving the fault data of the dual ported memory and communicates with an upper computer through a network interface to draw an oscillogram, and simultaneously, the second processor is used for performing statistics on the received fault data and storing to a large-capacity memory. According to the real-time monitoring method for the short-circuit current of the near zone of the transformer, acquisition, recording and analysis are performed on the short-circuit impact current at the secondary side of the transformer, and an accurate basis can be provided for the running state analysis and the maintenance of the transformer.

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...

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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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