NPDT620 / NPDT630 – Transformer Differential Protection
Products family : Transformer Protection
Sector : Industry, Railway
The differential protection relays NPDT 620 and NPDT 630 are designed to provide fast and selective protection of 2 and 3-winding three-phase transformers.
The relays can detect various types of fault such as phase-phase faults, inter-winding faults and earth-fault.
Restricted earth-fault protection, on primary and secondary sides, is an optional function for 3-winding transformers.
ANSI codes
87T – Transformer differential relay