go to the Air-insulated switchgear product page Anonymous asked on Jan 16th, 2015 in Air-insulated switchgear

What is a PIR?

Christian Cingolani, Global Product Marketing Manager LTB

ABB's answer

Pre-insertion resistors (closing resistors) are used to limit over-voltages in the network during switching operations. The pre-insertion resistors are only used during closing and consist of resistor blocks that are connected in parallel with the breaking chamber. The resistor blocks will close the circuit approximately 8-12 ms before the arcing contacts. Pre-insertion resistors are mainly used at higher system voltages (≥362 kV). For several applications, controlled switching using Switchsync™ is preferred.

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    Helene Hedlund

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    High Voltage Products

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