33kV RC Snubber for Norway reactor

Ensuring Transient Recovery Voltage (TRV) does not exceed circuit breaker ratings

rc snubber

The Problem In Detail

Transient Recovery Voltage (TRV) studies carried out for a Vestas site in Norway highlighted circuit breaker TRV ratings would be exceeded for certain fault and/or switching conditions of a 33kV shunt reactor.

rc snubber
shunt reactor switching

Finding the Solution

Enspec built a representative model of the site in PSCAD and carried out a new suite of TRV studies to design a suitable RC Snubber circuit.

rc snubber
shunt reactor switching

Making it all Work

The snubber was a combination of capacitors, surge arresters and resistor specifically design to limit the peak TRV and flatten the Rate of Rise of Recovery Voltage (RRRV).

rc snubber
reactive power compensation

What that means for the project now

The snubber is now fully installed and commissioned and is successfully keeping the transient voltages within the circuit breaker ratings.

Find out more about or RC Snubber design, TRV studies and further simulation capabilities here.