Transformer winding deformation live testing system and testing method thereof

Abstract

The invention discloses a transformer winding deformation live testing system. The system includes two signal injection mechanisms, each signal injection mechanism includes a sweep signal generator, the sweep signal generators are connected to protection circuits, the protection circuits are connected to the output ends of the signal injection mechanisms through coupling capacitors, and current transformers are arranged between the protection circuits and the coupling capacitors; the two signal injection mechanisms are connected to a neutral point busing and a high-voltage bushing end screen of a transformer winding respectively; the two current transformers are connected to an industrial control computer through RC filters, signal amplifiers and data acquisition channels. The invention also discloses a testing method of the abovementioned transformer winding deformation live testing system. The transformer winding deformation live testing system and testing method thereof can improve the defects of the prior art, reduce interference brought by operation of a transformer itself, and improve test precision.

Description

technical field [0001] The invention relates to the technical field of transformer detection, in particular to a transformer winding deformation live test system and a test method thereof. Background technique [0002] Abroad, Sweep Frequency Response Analyzer (Sweep Frequency Response Analyzer) and Network Analyzer (Network Analyzer) are mainly used to detect transformer winding deformation, but because of their high price, it is difficult to popularize and use them in China. [0003] my country's research on transformer winding deformation diagnosis technology started relatively late. Since 1990, Beijing Electric Power Research Institute, Wuhan High Voltage Research Institute, and Xi'an Jiaotong University have tried the frequency response method and achieved certain results. Later, all units of the power system and transformer manufacturers also used the frequency response analysis method to conduct general testing, accumulated a large amount of data and experience, and d...

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Problems solved by technology

[0005] (1) The conventional power failure test needs to remove all the wiring of the bushing. The test time is long, which not only consumes a lot of manpower and material resources, but also affects the reliable operation of the system;

[0006] (2) Affected by the blackout plan, the test is difficult and the test period is long

[0007] (3) The deformation of transformer windings for power outage detection is affected by on-site noise interference, it is difficult to obtain effective signals, and the test sensitivity is not high;

However, this detection method cannot accurately strip the interference signal generated by the winding itself during the operation of the transformer, so it is easy to cause interference to the test process due to the interference signal during the operation of the winding itself

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