Voltage-controlled time-multiplier protection
Voltage-controlled time-multiplier protection
(OP)
Does anyone out there have any experience of the application of Vtm (Voltage-controlled time-multiplier) protection on a high Voltage distribution system?
I believe the system is based on overcurrent relays which are arranged to reduce their time multipler settings as the system Voltage falls towards a fault.
I am particularly wondering how well the system would perform applied to a resistance-earthed 11kV system under earth-fault conditions.
I believe the system is based on overcurrent relays which are arranged to reduce their time multipler settings as the system Voltage falls towards a fault.
I am particularly wondering how well the system would perform applied to a resistance-earthed 11kV system under earth-fault conditions.






RE: Voltage-controlled time-multiplier protection
I've rarely seen these relays used for other applications and I don't really see much benefit to using one in the situation you describe. But I've been wrong before....