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SBD Differential Voltage Relay

SBD Differential Voltage Relay

The Type SBD11B is a single-phase, high-speed differential relay. It is specifically designed to provide bus differential protection, but may also be used for differential protection of shunt reactors. A high impedance, voltage measuring circuit with overcurrent supervision is used for fault detection. The utilization of static circuitry results in very short operating times. Output isolation is obtained with a telephone-relay, and a target seal-in unit is provided. A voltage selecting link allows the relay to operate on 48, 125, or 250 VDC. The relay is packaged in an S-2 type drawout case and requires no auxiliary CT's.

  • Bus and feeder differential protection
  • Protection and Control
  • Sensitive, high-speed differential protection
  • Phase and ground fault detection (requires 3 relays)
  • Breaker failure initiation when used with a suitable timing relay