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The PCS-931 relay provides full-scheme current differential and distance protection solutions for transmission lines with high- speed sub-cycle distance element. As well, the pilot scheme of distance protection and earth fault protection are integrated to provide a complete protection solution for the transmission line. The PCS-931 is intended for application on overhead lines and underground cables with diverse voltage levels, including series compensated, double-circuit, heavily loaded, weak infeed (WI), short and long lines. The relay provides dual pilot channels used for redundant tele-communication or three-terminal line application. It can meet the requirements of single-pole or three- pole tripping, it also provides single- and/or three-pole auto- reclosing functions. The PCS-931 is suitable for single- and dual-breaker applications, providing optional dual CT inputs, dual breaker failure protections, dual breaker auto-reclosing and dual synchro-checks. Additionally, the relay provides the remote/ local control of circuit breaker, disconnector and earth switch.
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The PCS-931 employs a wide range of innovative patented technologies, such as adaptive restraint threshold, dynamic capacitive current compensation, DPFC (Deviation Power Frequency Component) differential protection and unique power swing blocking logic, guaranteeing accurate and reliable operations.
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The PCS-931 is compatible with IEC 61850 station bus and process bus applications. It supports IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value. The RJ-45 faceplate port is provided for testing and setting, allowing for easier commissioning and maintenance.
