Why proper VT/PT Grounding is Important?
Grounding of Voltage Transformers (VTs), especially under peak load conditions is necessary.
What happens when a VT is not properly grounded?
Without grounding, the VT secondary might “float,” resulting in severe overvoltages under transient events (such as lightning or switching surges). These can exceed the insulating strength of the VT, causing catastrophic failures or possibly an explosion.
During peak hours, when system voltage & load are high, switching surges & faults are more common.
If the VT’s neutral is not grounded, surges may couple into the secondary winding. The floating secondary voltage can reach several kilovolts.
Failure of insulation might result in an internal arc or burst, posing a risk to both humans and equipment.
Proper grounding ensures a steady reference point, prevents overvoltage, and protects equipment and personnel.
It guarantees that any surge voltage is safely routed to earth, avoiding insulation stress & potential disasters.
In summary, a properly grounded VT provides reliable operation, a safe environment, and piece of mind. An ungrounded VT indicates a hidden threat that might lead to catastrophic failure during high load circumstances.
You can also follow us on AutomationForum.co, Facebook and Linkedin to receive daily Instrumentation updates.
You can also follow us on ForumElectrical.com , Facebook and Linkedin to receive daily Electrical updates.