No-load Test Method for Large Transformer Using Filter Compensation Technology

A no-load test and filter technology, applied in instruments, measuring electrical variables, measuring devices, etc., can solve problems such as loop oscillation and voltage waveform distortion, reduce transportation costs, improve and reduce distortion rate, and reduce test power supply capacity. Effect
CN103558469BActive Publication Date: 2016-02-10STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2016-02-10

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Abstract

Provided is a large transformer no-load test method adopting a filter compensation technique. According to the method, alternating current test power sources connected in sequence and an intermediate transformer in secondary connection with a tested transformer are included. The large transformer no-load test method adopting the filter compensation technique is characterized in that one or more sets of high voltage filters are connected between the intermediate transformer and the tested transformer in parallel, and each high voltage filter is a higher harmonic RLC series connection filter. The invention provides a large transformer test device based on a compensation filtering composite technology. The contradiction between the requirements on waveform quality and power capacity in current large transformer tests is solved, fundamental waves of test currents can be compensated, the harmonic waves in the test currents can also be filtered out, the test power source capacity is reduced obviously, and the test voltage waveform is improved. The filters work in a loop all the time in a no-load boosting process, high-voltage switching is not needed, transient overvoltages cannot be generated, and the risk factors of the tests are reduced greatly.
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Description

technical field

[0001] The invention relates to the technical field of large-scale transformer testing, in particular to a large-scale transformer no-load test method using filter compensation technology. Background technique

[0002] Large power transformers are one of the most important and expensive equipment in power transmission and transformation systems, and their reliability is directly related to the safe and stable operation of power systems. Before the transformer leaves the factory or is overhauled and put into operation, tests are required to check whether there are defects inside the transformer and whether it can be put into operation safely. The transformer no-load test can find the quality problems of the transformer core and winding, and it is one of the test items that must be done for the transformer.

[0003] At present, the typical no-load test circuit of large transformers at home and abroad is composed of test power supply, intermediate transformer, ...

Claims

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