1. IEC 60052 (2002) Voltage measurement by means of standard air gaps
2. Yan Z, Zhu DH (2007) High voltage insulation technology, 2nd edn. China Electric Power Press, Beijing
3. Guan GZ (2003) Fundamentals of high voltage engineering. China Electric Power Press, Beijing
4. Wan QF, Huo F, Xie L et al (2012) Summary of research on flashover characteristics of long air-gaps. High Volt Eng 38(10):2499–2505
5. IEEE Std 4 (2013) IEEE standard for high-voltage testing techniques