Diagnostics of Medium Voltage Surge Arresters

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Cselkó Richárd
Department of Electric Power Engineering

The gapped silicon carbide surge arrester are being removed from the operating system of the utilities, however, a large number are still installed in the power system. This work shows that the leakage current measurement, normally used as diagnostic technique for ZnO surge arresters.

In my thesis I deal with over voltage tools and control measurements.

The protection of over voltage from air or other sources is one of the fundamental conditions of safe operation of power systems

I will present that how necessary is the protection of over voltage, and what types has it got.

I specify how the ZnO arresters work, and I show its properties, and the backround of measurements results. I detail the theoretical backround of nonlinear resistance ZnO scones.

After the theoretical review I present the measurement process of nowadays with the overvoltage arrester. I represent some arresters status whith their wrong power loss, current, and resistance.

I show how can we measure the capacitance current in the best way.

I detail the characteristics of ZnO arrester that works for many years now.

I show how important is the thermal imager through a real example.


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