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Executive Summary Gas-insulated switchgear (GIS) bays expose many alarm points—run status, lockout, SF₆ pressure, temperature/humidity, and auxiliaries. Traditional designs stitch together scattered pilot lamps, relays, and buzzers, creating wiring density, space pressure, and maintenance overhead. A centralized annunciation unit consolidates point acquisition, indication, audible/visual control, and a hardwired total-alarm output into one device, cutting panel space and wiri

In global power projects,   IEC international standards ,   GB/T national standards , and   DL/T industry standards   are the...