Measurement of Site Pollution Severity under DC Voltage by Means of A Portable Test Station

The first step towards a reliable design of outdoor insulation for a HVDC system is to have a good evaluation of the site pollution severity. Long-term on-site measurements on insulators of the same type and energised at the same voltage provide the best accuracy for this purpose. However, for practical and economical reasons, such a measurement is seldom being performed. To meet the need of on-site pollution measurement under DC voltage a portable test station has been designed by STRI on the request of ABB. In a joint research activity between BDCC of SGC, CEPRI and ABB, this portable test station has been utilized in site pollution measurements for Three Gorges-Shanghai projects. In this paper the design of this portable test station is described. The measurements performed on Huangdo and Guojiagang sites are also presented.