| Title |
An Elimination Method of the Circulating Current Flowing into Coaxial-Neutral Lines in 22.9[㎸] CNCV Underground Cable Systems |
| Authors |
Myung-Su Jeon ; Joong-Ho Song |
| Keywords |
Corculating current in co-axial neutral lines of distribution cables ; Multiple-point ground ; 22.9[㎸] CNCV distribution system |
| Abstract |
In 22.9[㎸]-y distribution systems, underground cables are provided with multiple-point ground in which each coaxial-neutral line of the distribution cable lines(A, B, C phases) is 3-wire common grounded. In the underground cable distribution systems, circulating current flows in the coaxial-neutral lines and its magnitude amounts to about 40~50[%] load currents, even though loads are balanced. Power loss due to the circulating current consequently reaches to about 76[%] total losses occurred in all conductor lines. This power loss provokes additional temperature rise of the underground cable lines and finally results in 20[%] reduction of the current capacity of the cables. This paper presents a new ground method to overcome such a problem The proposed method eliminates the circulating current flowing in the coaxial-neutral line effectively. Measurement results confirmed from the practical site-test show validity and effectiveness of this research. |