Influence of Transformer Capacity on Insulator Leakage Current Acquisition Results

Abstract:

To study the influence of test transformer capacity on insulator leakage current acquisition results, leakage current acquisition experiments with the clean and dry insulator and the water drops attached insulator were conducted based on the sampling resistor method and the test transformers of different capacities whose models are YDTW-1200 kVA/300 kV, YDTW-50 kVA/250 kV, YDTW-10 kVA/100 kV, YDJ-5 kVA/50 kV respectively. To make the results more reliable, sampling resistors with different resistances, 10 Ω, 100 Ω, and 1 kΩ, were used to collect the leakage current. The root-mean-square (RMS) values of the leakage current, the ratio of the 3rd harmonic to the fundamental (K₃) and the 5th harmonic to the fundamental (K₅) were extracted from the measured data. And it was discovered that the transformer capacities has a very slight influence on the leakage current RMS value but has a great impact on the value of K₃ and the K₅. The maximum K₃ are approximately 3 times of the minimum K₃ and the maximum K₅ are approximately 9 times of the minimum K₅.

• Periodical: Advanced Materials Research (Volumes 986-987)
• Pages: 1963-1968
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.986-987.1963
• Online since: July 2014
• Authors: Peng Chao Miao*, Zhi Niu Xu
• Keywords: 3rd Harmonic, 5th Harmonic, Insulator, Leakage Current, Transformer Capacity

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