Trihal Transformers Troubleshooting Guide

This document provides a structured troubleshooting guide for Trihal transformers, listing symptoms, probable causes, and recommended remedies for issues such as tripping during energization or operation, abnormal secondary voltage, and low insulation resistance. It includes specific intervention levels for each corrective action, covering components like PTC sensors, HV fuses, current transformers, windings, and off-circuit tapping links.