Publications Repository - Gdańsk University of Technology

Metal oxide surge arresters have been widely used for protection of power system networks against overvoltages due to atmospheric discharges or malfunction of devices connected to the network. During its operation a surge arrester structure is degradated, what can be observed as an increase of a surge arrester leakage current. Paper presents an implementation of a new, high-permeability, Co64Fe4Ni1Si15B14 amorphous alloy as a current transformer for monitoring of a leakage current in low voltage surge arresters. The characteristics of the current transformer for different loads have been measured in the system using very sensitive current-voltage converter. Experimental results confirmed that low current transformer utilizing Co64Fe4Ni1Si15B14amorphous alloy in annealed state gives a possibility to measure a leakage current about several A with operating frequency 50Hz. Moreover, the results indicate, that the leakage current waveforms have a different shape than a pure sine wave voltage applied to the surge arrester enabling an evaluation of the device nonlinearity as a measure of its degradation by means of a resistive component of the leakage current.

Authors

• Jacek Salach,
• dr inż. Lech Hasse link open in new tab ,
• Roman Szewczyk,
• prof. dr hab. inż. Janusz Smulko link open in new tab ,
• Adam Bieńkowski link open in new tab ,
• Piotr Frydrychowicz link open in new tab ,
• Aleksandra Kolano-Burian