지중 송전케이블의 시스 순환전류 특성분석과 저감대책
Characteristic analysis and reduction countermeasures of sheath circulating currents in undergound transmission cables
지중송전케이블 시스순환전류 저감대책;
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Nowadays underground transmission cables are being expanded in the cities to large demand of electric energy. After the cable is installed, many geometric factors, such as burying types of the cable and the length difference of the cable between each minor section will cause the impedance unbalance between cables. The impedance unbalance will increase or decrease the sheath circulating currents, which are critical to human safety and sustaining the capabilities of electric power. In this thesis, the increasing trend of the sheath circulating currents due to geometric unbalance between cables within a major section has been fully studied. An analysis model has been proposed to simulate the sheath circulating currents. The results from modeling and measurements on the cable on service has been compared. According to the study. A current reduction method is proposed and an equipment is designed and developed to reduce the sheath circulating currents. The results from modeling show that both self impedance and mutual impedance of the cables cause excessive sheath currents, and both. The results from modeling show that both self impedance and mutual impedance of the cables cause excessive sheath currents, and both selt impedance and mutual impedance are affected by geometric unbalance because of burying types in the field. The sheath currents under different burying types are simulated by the proposed model and measured are in great accordance. The reduction equipment is tested when the cable is on service. The test results show that it can reduce the sheath circulating currents by up to 97.8[%]. This confirms the validation of the new method and the reduction equipment, and assures the safe operation of the transmission cables.
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