Transformer partial discharge online detection data acquisition unit and detecting method

Abstract

The invention relates to a data acquisition unit for on-line detection of transformer partial discharge and a detection method thereof. The data acquisition unit detects and acquires the transformer partial discharge signals and transmits the signals to a host computer for processing via a transformer partial discharge signal amplification module, a high speed data acquisition module and a remote communication module. In the invention, proper program control filtering and amplifying circuit are designed and manufactured, the precision of signals is high, the design and manufacturing of a high-speed and large-capacity multiple-channel synchronous data acquisition module circuit are finished, the requirement of detecting external multi-channel circuits can be met, and the adaptability is good; the invention is characterized by rapid sampling rate and large storage capacity, etc.; the whole acquisition system can be divided into a plurality of channels, the maximum sampling rate of each channel can reach 20MHz and the maximum storage depth can reach 512 K words; the data acquisition unit finishes digitization of partial discharge signals and upload the signals for processing, thus effectively reducing the distortion and aberration of the partial discharge signals during transmission, meanwhile, the data is transmitted by adopting the GPRS wireless communication technology, which reduces the cost and facilitates the construction and installation.

Description

technical field [0001] The invention belongs to the field of microcomputer relay protection, and in particular relates to a detection device and a detection method of a power grid transformer with a voltage level of 35kV and above, specifically a data acquisition device and a detection method for detecting partial discharge of a transformer based on GPRS. Background technique [0002] With the development of society and economy, human beings rely more and more on electricity, and correspondingly higher requirements are put forward for the reliability of power supply. Transformer is one of the important equipment of power system. Bring huge direct economic losses, and its indirect losses are even more inestimable. According to statistics, most of the accidents in power transformers are caused by the aging and damage of insulation. For example, some researchers have made a statistical analysis of 93 accidents that occurred in several 35kV and above transformers, among which t...

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Problems solved by technology

[0004] (1) The outage and maintenance cost the power department huge manpower and material resources, which not only brings inconvenience to power users, but also has the problem of "excessive maintenance";

[0005] (2) The interval between two preventive tests is long, it is difficult to find sudden insulation faults, and there is a problem of "insufficient maintenance";

[0006] (3) There are differences between test conditions and operating conditions, and some off-line tests cannot fully reflect the insulation status of the equipment under operating conditions;

[0007] (4) Artificially causing new equipment failures during overhaul and power outage tests also occurs

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