A Study for the Measurement of the Minimum Clearance Distance between the 500 kV DC Transmission Line and Vegetation

Kumail Hassan Kharal, Chang-Hwan Kim, Chulwon Park, Jae-Hyun Lee, Chang-Gi Park, Se Hee Lee and Sang-Bong Rhee
Additional contact information
Kumail Hassan Kharal: Department of Electrical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongsangbuk-do 38541, Korea
Chang-Hwan Kim: Department of Electrical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongsangbuk-do 38541, Korea
Chulwon Park: Department of Electrical Engineering, Gangneung-Wonju National University, Wonju 26403, Korea
Jae-Hyun Lee: KEPCO New Transmission Construction Team (HVDC), KEPCO, Naju 58217, Korea
Chang-Gi Park: KEPCO New Transmission Construction Team (HVDC), KEPCO, Naju 58217, Korea
Se Hee Lee: Department of Electrical Engineering, Kyungpook National University 80, Daehak-ro Buk-gu, Daegu 41566, Korea
Sang-Bong Rhee: Department of Electrical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongsangbuk-do 38541, Korea

Energies, 2018, vol. 11, issue 10, 1-10

Abstract: High voltage direct current (HVDC) transmission is being widely implemented for long-distance electrical power transmission due to its specific benefits over high voltage alternating current (HVAC) transmission. Most transmission lines pass through forests. Around the HVDC lines, an arc to a nearby tree may be produced. Thus, there should be a minimum possible clearance distance between a live conductor and a nearby tree, named the minimum vegetation clearance distance (MVCD), to avoid short-circuiting. Measurement of minimum clearance distance between the conductor and trees is a significant challenge for a transmission system. In the case of HVAC transmission, a large amount of research has been undertaken in the form of the Gallet equation for the measurement of this distance, whereas for HVDC transmission no substantial work has been done. An equivalent AC voltage value can be derived from the DC voltage value in order to use the Gallet equation. This paper presents an experimental measurement technique for determining the MVCD at 500 kV to verify the results obtained from the Gallet equation in the case of DC voltage. Performing the experiment with a 500 kV DC line is not possible in the laboratory due to safety concerns. Therefore, an experiment up to 60 kV is conducted to measure the MVCD for DC voltage. The measured results achieved from the experiment are then extrapolated to calculate the MVCD at 500 kV.

Keywords: Gallet equation; HVDC transmission; minimum vegetation clearance distance (MVCD) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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