HV Substation Diagnostics

Diagnostic engagement for a regional high-voltage substation in Colombia experiencing recurring surge arrester failures. The investigation combined a ferroresonance study with EMTP modelling of the substation to identify the source of temporary overvoltages.

• Root-cause analysis of repeated surge arrester failures at the substation.
• Ferroresonance study of the substation configuration and switching conditions.
• EMTP modelling of the network to reproduce and characterise temporary overvoltages.
• Mitigation recommendations to prevent recurrence and future outages.

Identified temporary overvoltage sources causing surge arrester failures, mitigating future outages.