Current protection relay PCS-978

IECdifferential

PCS-978 provides full scheme protection and control solution for varies type power transformers including multiple-winding transformers and auto-transformers, as well as shunt reactors. It integrates up to 36 current/voltage inputs in order to be suitable for applications like one-and-a-half breaker or ring breaker arrangements. Up to 6 group CT inputs are included in current differential protection. In addition, 288 vector groups are available for 3-winding transformers, as well as 24 vector groups, which available for 2-winding transformer. The unique current differential protection includes conventional phase current differential elements and innovative DPFC differential elements, in effort to provide reliable and secure protection and to ensure the safety of vital assets. To improve the reliability of mechanical protection, dedicated high-threshold binary inputs are designed for mechanical protection. In addition, automatic CT ratio compensation and vector group compensation are provided to eliminate the external interposing CTs. The PCS-978 is compatible with IEC 61850 station bus and process bus applications. It supports IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampled Value. Additionally, a RJ- 45 faceplate port is provided for testing and setting in order to make commissioning and maintenance easier. • Transformer biased current differential protection (87T) • Transformer unrestrained instantaneous current differential protection (87T) • Transformer biased DPFC current differential protection (87T) • Reactor biased current differential protection (87R) • Reactor unrestrained instantaneous current differential protection (87R)