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STV Overexcitation Relay

STV Overexcitation Relay

This product is under last-time buy. Orders may be placed until 31st December 2021 and will be fulfilled based upon availability. As an alternative, please refer to P342, 889 or G30.

The Type STV relay is a single-phase static overexcitation relay. It consists of an overexcitation sensing unit which has a linear volts per hertz pickup characteristic, and a timing unit to provide a definite time before initiating some protective action. A target seal-in unit is also provided to protect the timing unit contacts during tripping duty.

The Type STV relay is designed specifically for equipment protection in case of overexcitation. Overexcitation of a generator or power transformer may occur during start-up, shutdown, or as result of remote load rejection. As as result, overheating due to core saturation within a very short time may cause severe damage. This relay, employing a constant volts per hertz pickup, recognizes overexcitation and initiates some appropriate action to protect the equipment.

Features and Benefits
  • Target seal-in units
  • Drawout case
  • Applications
  • Transformer and generator protection
  • Alarm and backup protection
  • Protection and Control
  • Overexcitation
  • Adjustable pick-up voltage
  • Adjustable time delay