SKD-T and SKD-IT Static Distance Relay Technical Manual

This document provides technical specifications and operational theory for SKD-T and SKD-IT static distance relays, covering auto-transformer tap settings, phase shifting circuits, memory circuits, and isolating transformers. It explains the phase-to-phase and three-phase fault detection logic, including how compensator settings, polarizing voltages, and phase angle comparison determine trip or restraint conditions for various fault locations.