In order to meet some special requirements, we can integrate frequency monitoring functionsinto voltage monitoring relays or current monitoring relays.
Mainlyinclusive of the following:
1. Three-phase monitoring relays + frequency monitoring function (40 ~ 70Hz)
2. Single-phase monitoring relays + frequency monitoring function (40 ~ 70Hz)
3. Current-monitoring relays + frequency monitoring function (40 ~ 70Hz)