HCB and HCB-1 pilot wire relay systems

The type HCB relay is a high speed pilot wire relay designed for the complete phase and ground protection of two and three terminal transmission lines

The type HCB-1 relay is a high speed pilot-wire relay designed for the complete phase and ground protection of two and three terminal transmission lines.

Simultaneous tripping of the relay at each terminal is obtained in about 20 milliseconds for all faults. A complete installation for a two terminal line consists of two relays, two insulating transformers, and an interconnecting pilot-wire circuit. For a three terminal line, three relays, three insulating transformers, and a wye-connected pilot-wire circuit with branches of equal series resistance are required.

The HCB-1 and HCB relays are not compatible, since the filter response is not the same.

 Why ABB?

  • Long production life, ease of application and reliable protection
  • High quality design
  • 12 year warranty
  • Short lead times
  • Consistent on-time delivery
  • 24/7 customer support

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