Abstract

The newly proposed /EC dielectric test code for power transformers (Pub/. 76/3) intends to more closely relate test procedures and test levels to system service conditions. Based on a presentation of service conditions and methods of insulation coordinaLion with respect to transient and operating stresses (switching, lightning impulse and power-frequency overvoltages) the newly proposed methods are compared with existing procedures for system voltages Um> 300 kV. A critical review of the difficulties in adapting the new test procedure to different system conditions and the consequences for manufacturers and users is given.

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