Rezaei, Kamran

Transmission Design Engineer, Transpower, New Zealand

Rezaei, Kamran

Transmission Design Engineer, Transpower, New Zealand

Biography

Application of Leakage Current Monitoring in Design of HVDC Insulation

Mr Rezaei holds a Bachelor’s Degree in Electrical Engineering from Azad University in Tehran. He has worked as transmission line designer for 15 years, starting first with engineering consulting firms in Iran and later at hydropower generators such as Statkraft in Europe. Currently, he is responsible for design of insulators and transmission lines at New Zealand’s TSO.

As part of past uprating of its HVDC link and reinsulating the line for 350 kV, Transpower initiated a program to collect pollution data at various points. ESDD was measured on energized insulators and pollution flashovers tests carried out to establish relative performance of different insulator types. During the past years, silicone and RTV silicone coated glass insulators have been considered to improve pollution performance of insulators in coastal areas. This presentation reviews service experienve with different insulators. It also explains how monitoring leakage current on coated glass insulators has allowed assessing wether hydrophobicity can allow reduce creepage distance of strings by correlating data from field studies with the approach of IEC 60815-4.

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