PASS for digital substations belongs to Hitachi Energy innovative high-voltage hybrid switchgear family PASS (Plug and Switch System). PASS encloses all functions of a complete switchgear bay in a single module. The hybrid design makes use of traditional air-insulated busbars to connect with other equipment in the substation.
Hitachi Energy's hybrid switchgear can be equipped with Motor Drive (MD) and an intelligent local control cabinet, for smooth integration into substation automation systems using IEC 61850. MD brings the technology to monitor the functions of the switchyard continuously while performing real-time simulation and diagnostics, allowing pro-active management of the life-cycle of the asset and remote service intervention.
For connection to the IEC 61850-9-2 process bus, non-conventional instrument transformers (NCITs) FOCS, ELK-CP14 or ELK-CP3 with merging units are used for sampled values for protection and metering. Alternatively, SAM600 stand-alone merging units can be connected to conventional current or voltage transformers of the PASS.