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.
High Voltage Products
If you want to purchase a product, need any pricing information or need help or support from ABB, please contact your local partner.