Transformer base earthing connection grounds the metallic base and frame of a power transformer to the substation's earth grid for safety and fault protection.

Purpose

• •Personnel safety by maintaining tank at earth potential
• •Provides low-resistance fault current path
• •Works with surge arresters for lightning protection
• •Ensures equipotential bonding

Installation

• •GI or copper flat (50x6mm or 75x10mm typical)
• •Bolted lugs or exothermic welding
• •Multiple connection points on large transformers
• •Spring washers and anti-corrosive paste

Standards

• •IEEE 80 for substation grounding
• •IEC 60076 for transformer specifications
• •IS 2026 for Indian installations