Offshore transformer winding unbalance rate high-precision measurement device and rapid test method

Abstract

The invention provides an offshore wind power transformer winding unbalance rate high-precision measurement device and a rapid test method. The offshore wind power transformer winding unbalance rate high-precision measurement device comprises a constant current source, a microprocessor, a display screen and a voltage measurement device, and the display screen and the voltage measurement device are connected with the microprocessor. The constant current source is connected with a first leading-out end and a second leading-out end, the first leading-out end and the second leading-out end are respectively used for connecting two ends of a transformer winding to be tested, and an additional resistor is connected in series between the first leading-out end / the second leading-out end and the constant current source. The scheme has the advantages of simple structure, low cost, small size, portability, convenience in use and the like, and the time constant can be reduced by connecting the resistors in series with the test loop, so that the test speed is improved, and the strict requirement of the marine test on the test time is met.

Description

technical field [0001] The invention belongs to the technical field of DC resistance testing of offshore transformer windings, and in particular relates to a high-precision measuring device and a rapid testing method for the unbalance rate of offshore transformer windings. Background technique [0002] Transformer winding DC resistance test is one of the basic items of delivery, handover and preventive tests. It is the basis for obtaining unbalance rate and an important inspection item after transformer failure. Whether there is inter-turn or inter-layer short circuit in the transformer winding; check whether the contact of each tap position of all tap-changers is good; check whether the actual position of the tap-changer is consistent with the indication; check whether the lead-out wire is broken; check the multi-strand wire winding Whether there are short strands; check whether the winding lead wire is in good contact with the conductive rod. Therefore, for a long time, m...

AI Technical Summary

Problems solved by technology

The method of increasing the current will to a certain extent cause the problem of excessive test remanence due to excessive test current, so the method of series resistance is generally used at present.

However, the method of series resistance also has certain defects, such as the resistance itself will have a certain impact on the measurement results, which needs to be further improved

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