变压器缩尺模型声功率测量方法比较

建立一个变压器缩尺模型，在半消声室环境下，以PULSE声振采集系统为测量分析平台，输出并采集各工况下测点的噪声数据。通过比较GB/T 1094.10—2003《电力变压器 第10部分：声级测定》与GB 6882—86 《声学 噪声源声功率级的测定：消声室和半消声室精密法》2种标准测量计算的变压器辐射声功率，验证了工程测量标准GB/T 1094.10—2003的准确性和稳定性，研究了不同声学边界条件对声功率测量结果的影响。实验结果表明：防火墙对变压器辐射声功率有一定影响；不同声学边界条件下，2种测试标准声功率测量结果非常接近，且差值都在1 dB以内，表明工程测量标准GB/T 1094.10—2003的准确性和稳定性很高。

Comparative Research of Sound Power Measurement Method on Transformer Scale Model

In a semi-anechoic chamber, by using PULSE sound and vibration acquisition system, noise output signals of different measurement points on a scale transformer model under different operation conditions are measured and analyzed. By comparing two standards of acoustic radiation power calculation between GB/T 1094.10—2003“Power transformers Part 10: Determination of sound levels” and GB6882—86“ten point sound power approach”, the effects of different boundary conditions on acoustic sound power measurements are studied. Experimental results show that firewall has some influence on acoustic radiation power transformer. Under different acoustic boundary conditions, results from two test standard are very close and within 1 dB mismatch. The methods described in standards GB / T 1094.10—2003 is very accurate and stable according to the study.