결함별 절연유중 부분방전 측정 연구

PD Measurement in oil with defects

Since partial discharges in power transformers weaken their insulation performance the detection of partial discharge is very important for prevention of fatal incidents. This study describes use of electromagnetic coupler for measurement of partial discharge of transformers. Spiral antennas of which bandwidth is 0.5GHz to 3GHz were used as coupler and setup in chamber for partial discharge tests. Test results showed that outputamplitudes are increased with PD increase and frequencies of signal measured by these antennas are mostly distributed below about 800MHz.