Transient Ground Potential Rise (TGPR) Study for Switchyard
Transient Ground Potential Rise (TGPR) refers to a sudden surge in ground potential during faults or lightning strikes. It becomes critically important in gas-insulated substations (GIS), where high-voltage conductors are enclosed in grounded enclosures. These rapid transients pose a threat to both personnel safety and sensitive circuitry.
Problem Statement
1. Switchyards operating at ultra-high voltages are vulnerable to transient stresses during fault or lightning events.
2. Due to frequency-dependent impedance changes, uneven potential differences can arise across the grounding network.
3. Without proper TGPR analysis, there’s a risk of unsafe operations and ineffective grounding design.