Optimum selectivity is assured, as the scheme measures the currents entering and leaving the protected plant item. Instantaneous tripping results for an internal fault, with stability for any out-of-zone fault. Tripping uses a proven characteristic comparing differential current with through current, for ease of testing. Phase differential elements of this type offer consistent detection of solid and resistive faults, with optimum faulted phase selection, tripping, and indication.
- Phase segregated differential with proven biased characteristic for distribution/sub-transmission networks
- Graphical programmable scheme logic (PSL) eases protection scheme creation, and avoids the need for external logic controllers
- Comprehensive communication options, ideal relay for the step from pilot wire to fiber or multiplexed end-end communications