Importance

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Abstract

An electrical surge suppressor includes a capacitive component incorporated inside a housing and immersed in, or filled with, oil; a linear resistive component; and a non-linear resistive component connected or connectable in parallel with the linear resistive component. The surge suppressor has a monitoring circuit configured to measure at least one operating characteristic of the linear and/or non-linear resistive and capacitive components and an auxiliary power supply integrated within the capacitive component to provide an auxiliary supply voltage to the monitoring circuit. The capacitive component is connected in series with the parallel connected linear and non-linear resistive components and connected to a phase contact; the phase contact is connected or connectable to the load circuit; and the capacitive component is configured to provide a high impedance connection to the linear and non-linear resistive components, at nominal power supply frequencies and, during switching transients, to provide a low impedance to a combined resistive impedance of the linear and non-linear resistive components effectively into the load circuit.

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First Claim