go to the Air-insulated switchgear product page Anonymous asked on Jan 27th, 2015 in Air-insulated switchgear

Why are grading capacitors used on circuit breakers?

Christian Cingolani, Global Product Marketing Manager LTB

ABB's answer

Grading capacitors are sometimes used on circuit breakers of multi-break design (two or more identical making/breaking units connected in series) to obtain uniform distribution of the voltage stresses across the open gaps. The grading capacitor is connected in parallel with each and every making/breaking unit and has a standard value of 1600 pF/capacitor. The total capacitance across one open pole is calculated as follows: Ctot = Cgr/n Where: Cgr is the capacitance of each grading capacitor. n is the number of making/breaking units connected in series

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    Helene Hedlund

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    High Voltage Products

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