J. W. Smith, G. Gela and M. F. McGranaghan, “Control of Line-to-line Overvoltages for Helicopter-based Live Work on a 500kV Transmission Line,” 2008 IEEE Power and Energy Society General Meeting – Conversion and Delivery of Electrical Energy in the 21st Century, Pittsburgh, PA, US, 2008, pp.1-7.

has been cited by the following article:

• TITLE: Safety Distance Determination for 500 kV AC Transmission Line’s Helicopter Inspection

  AUTHORS: Shuwei Wan, Xingming Bian, Lan Chen, Liming Wang, Zhicheng Guan

  KEYWORDS: Transmission Lines; Electric Field; Helicopter Inspection; Safety Distance; Limit-value; Transient Electric Shock

  JOURNAL NAME: Energy and Power Engineering, Vol.5 No.4B, November 15, 2013

  ABSTRACT: As an efficient and advanced line inspection method, helicopter line patrol is gradually more and more used in transmission lines inspection, promoting the elaborate operation of transmission lines and reducing the management cost. However, as a 'floating-potential conductor' near to a high-voltage transmission line, the helicopter would be at a high electric field region; and bring security risk to equipment and operating personnel. In this paper, the electric field strength near the cabin at locations of different distance from transmission lines is investigated by calculation, and the field in the helicopter cabin is also calculated with finite element method (FEM). The result indicates that the potential difference becomes higher with the decrease of the distance between the helicopter and transmission line. Considering the discharge energy and the guarantee of the persons’ safety, the safety distance is determined as d≥15 m.