Manufacturer of Isolators / Stockiest of Over Head Line Materials / Govt Contractors.
Commissioning a substation is the final, but most critical, phase before energization. However, minor oversights during this process can snowball into costly failures, equipment damage, or unsafe operation within weeks or months of operation.
In this post, we’ll explore the top substation commissioning errors, their impact, and how to avoid them through best practices.
Many teams skip thorough checks due to tight deadlines. This includes -
Impact - Leads to high contact resistance, false relay tripping, or delayed fault clearing.
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Earthing continuity is often not tested rigorously.
Common Mistakes -
Impact - High risk of electric shock, equipment malfunction during faults, failure in lightning surge protection.
Instrument transformers must be correctly tested and labeled during commissioning.
Errors include -
Impact - Relay coordination fails. May lead to untripped faults or nuisance tripping.
SCADA systems often face issues like:
Impact - Operators receive false readings or are unable to control equipment remotely during emergencies.
Isolators must be aligned to ensure -
Impact - Contact burns, phase-to-earth flashovers, or operational jamming during service.
Many engineers copy relay settings from another substation without verifying actual site parameters.
Impact - Relay may operate outside intended time-current characteristics, defeating the grading plan.
Systems like battery banks, chargers, tripping circuits, and annunciation panels are often ignored.
Impact - DC supply failure during actual faults or breaker fails to trip due to control supply drop.
If you're working on substation projects or commissioning, you might also find these topics helpful -
Substation failures shortly after commissioning are often preventable. By investing time in proper testing, alignment, documentation, and verification, you ensure long-term reliability and safety of your electrical infrastructure.
Remember - Commissioning is not just a formality — it's your first protection against future failure.
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