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2. CIGRE Technical Brochure 638. Guide to overall line design. Working Group B2.51, Paris (2015, Dec). www.e-cigre.org
3. CIGRE Technical Brochure 63. Guide to procedures for estimating the lightning performance of transmission lines. WG 33.01, Paris (1991, Oct). www.e-cigre.org
4. CIGRE Technical Brochure 388. Impacts of HVDC lines on the economics of HVDC projects. Joint Working Group B2/B4/C1.17, Paris (2009, Aug). www.e-cigre.org
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