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ULTRASONIC OR TEV? - hvds.co.nz
www.hvds.co.nz104 PT&D February/March 2005 www.powertrans.com.au ULTRASONIC OR TEV? By Greg Linton, HV Diagnostic Services Ltd Figure 1 ULTRASONIC CASE STUDY A routine substation survey in August 2004 located a discharge of 20% FSD