Over-current protection relay PCS-978S

over-current protection relay
over-current protection relay
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Measured/monitored value
over-voltage, under-voltage, over-current
Other characteristics
differential, adjustable, modular


PCS-978S has been designed specifically for the protection of various type power transformers, including two-winding transformers, three-winding transformers (up to 6 branches), as well as auto-transformers in any voltage level. PCS-978S is the main protection for the transformer and contains many other protection, control and monitoring functions. With its modular structure, flexibility and the powerful PCS-Studio engineering tool, PCS-978S offers future-oriented system solutions with high investment security and low operating costs. • Transformer differential protection (87T) • Inrush blocking • CT saturation blocking • Overexcitation blocking • CT circuit failure blocking • Amplitude compensation • Phase angle compensation • Restricted earth-fault protection (64REF) • Winding differential protection (87W) • Overexcitation protection (24) • Mechanical protection (MR) • Phase overcurrent protection (67P, 50/51P) • Earth-fault protection (67G, 50/51G) • Negative-sequence overcurrent protection (67Q, 50/51Q) • Undervoltage protection (27P) • Overvoltage protection (59P) • Zero-sequence overvoltage protection (59G) • Switch-onto-fault (SOTF) logic • Remote/local control • Voltage and current drift auto adjustment • Frequency tracking


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.