The PCS-222 is an intelligent terminal by NR Electric that bridges IEC 61850 process-bus communication and conventional switchgear. Installed near primary equipment in digital substations, it receives GOOSE tripping and reclosing commands from protection relays over optical fiber and converts them into hardwired relay outputs — eliminating long copper control cable runs while maintaining the speed and reliability demanded by protection applications.

How does the PCS-222 interface with protection relays?

The terminal provides 15 independent optical GOOSE interfaces, receiving tripping (TJR — non-reclosing, TJQ — initiating auto-reclose) and reclosing commands from upstream protection and BCU devices. Response from GOOSE message receipt to output relay actuation is under 7 milliseconds, and the UAPC platform architecture ensures this latency is unaffected by GOOSE network storms. A dedicated RS-232 commissioning port handles local configuration.

What switchgear can the PCS-222 control?

The standard configuration manages one circuit breaker plus four disconnectors and four earthing switches. Of the 33 binary outputs, 24 are allocated to remote control: trip, close, and block commands for the breaker, plus open/close for each disconnector and earth switch. Fifty-four binary inputs capture breaker position, disconnector status, mechanism monitoring signals, and transformer body signals — all time-stamped and recorded.

How does time synchronization work?

The PCS-222 supports both optical IRIG-B and IEEE 1588 PTP for time synchronization. In the PCS-222CG variant with merging unit functionality, time error is held below 1 microsecond — essential for sampled value alignment in process bus applications at 110 kV and below.

Where is the PCS-222 installed?

Designed for outdoor installation in weatherproof cabinets near primary switchgear, the fully enclosed chassis separates strong and weak circuits for maximum EMC immunity. The unit integrates ambient temperature and humidity measurement and holds 256 event records plus 256 self-supervision logs for local diagnostics. Modular plug-in hardware supports field upgrades without full unit replacement.