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HCB-1 High-Speed Pilot Wire Relay Descriptive Bulletin

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This document is a descriptive bulletin for the Type HCB-1 relay, a high-speed pilot wire relay designed for phase and ground fault protection of two or three terminal transmission lines. It details the relay's application, construction, features, operation principles for internal and external faults, and technical specifications including pickup settings, pilot wire requirements, and installation guidelines.

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