SECONDARY EARTHING:
• The secondary earthing system (a common system for Protective &
Electronic earth) is basically related to earthing of motors, power distribution
equipment, control equipment and instrumentation
• Engineering of secondary earthing system typically consist of:
• Principle - earthing system in substation and process buildings
• Earthing bars and connections
• Earthing of Transformer
• Earthing of power distribution system
• Earthing of motors and drives
• Earthing of control and instrumentation equipment
• Earthing of cable rack system