Over-voltage protection relay PCS-985TI

under-voltageover-currentover-frequency

PCS-985TI is a high performance numerical transformer protection device, which integrates main and backup protection into one device. It provides complete protection of a transformer in any voltage level, and is typically applied for startup/standby transformer or auxiliary transformer of power plant with multiple branches, and main transformer, etc. It also provides basic protection of a two-winding main transformer and one or two auxiliary transformer. PCS-985TI provides up to 80 analog input channels including current and voltage inputs. The transformer protections are configurable. Ancillary functions of fault diagnostic, disturbance records, event records and communication function are integrated in the device. • Current differential protection (87T) • Transformer restricted earth fault protection (64REF) • Negative-sequence Overcurrent protection (50/51Q) • Overexcitation protection (24) • Phase overcurrent protection (50/51P) • Phase overcurrent alarm elements (51PAlm) • Ground overcurrent protection (50/51G) • Phase overvoltage protection (59P) • Phase undervoltage protection (27P) • Residual overvoltage protection (59G) • Overfrequency protection (81O) • Underfrequency protection (81U) • Rate-of-frequency-change protection (81R) • Thermal overload protection (49) • Impedance protection (21) • Breaker failure protection (50BF) • Pole disagreement protection (62PD) • Breaker flashover protection (50F) • Mechanical protection (MR)