Measurement of Noise Instability of Dry Transformer in a Test Room

The article is focused on the method of measuring the instability of noise of a dry transformer in a test laboratory. The experimental measurement was carried out for the method of obtaining reference values of the acoustic emission size and its stability of a good dry transformer 22000/6000 V in the laboratory and their possible comparison with the real values of the transformer during its operation. The measurement was performed using a noise measuring device with a three-octave spectral filter in the frequency range from 100 Hz to 10 kHz for a period of 20 s. The mentioned measurements can form reference values for the analysis of the state of dry transformers with the same type and performance after their operation or repair sent for inspection to test laboratories.