A practical guide to numerical low-impedance 87B protection: operate/restraint characteristics, CT saturation security, selective and check zones, disconnector replica, end-zone and breaker-failure logic.
A practical engineering guide to REF protection for grounded transformer windings: zone boundaries, 64REF/87N terminology, high- and low-impedance methods, CT design, settings, trip logic and commissioning.
Source-aware profile of the GE Vernova Multilin 850 feeder protection system and 850D dual-feeder variant.
Verified profile of the SEL-751 feeder protection relay covering directional overcurrent, arc-flash detection, communications and monitoring.
Source-aware profile of Schneider Electric PowerLogic P5 withdrawable protection relays for feeders, lines, motors and transformers.
Verified profile of the modular Siemens SIPROTEC 7SJ85 for overcurrent protection, control and monitoring of feeders and related assets.
Source-aware profile of ABB Relion REX615, a modular all-in-one protection and control relay for power distribution applications.
