Measurement of noise emitted by power equipment based on coherent power

Measuring the noise emitted by power equipment requires measuring the total environment noise and background noise. Due to it being impossible to shut down the power equipment to measure background noise, the noise emission of power equipment cannot be measured accurately. This work conducts research on noise emission of power equipment based on coherent power. Firstly, a test in the lab was conducted to measure the noise emitted by two speakers based on coherent power. This test showed that the measurement error was less than 1 dB(A). Subsequently, the measurement of noise emitted by power equipment was carried out in a 500 kV substation, and the results showed that the measurement error was also less than 1 dB(A). Through measurements in the lab and substation, it has been verified that the coherent power method can accurately measure the noise emitted by power equipment, avoiding the error caused by inaccurate measurement of background noise.