Switchyard Testing
We provide precise diagnostics for switchyard assets, ensuring measurement accuracy, insulation integrity, safe isolation, and surge protection. Our testing covers CTs, PTs, Lightning Arresters, and Isolators — verifying every parameter from ratio and polarity to leakage current and mechanical operations, guaranteeing dependable system performance.
CT (Current Transformer)
Ensures metering and protection accuracy, insulation health, and correct polarity for reliable current measurement under all loading conditions.
- Ratio & polarity check
- Magnetization/excitation & knee-point test
- Burden/accuracy class verification
- Insulation resistance & tan δ
- Winding resistance & secondary circuit continuity
PT (Potential/Voltage Transformer)
Confirms voltage accuracy, dielectric strength, and burden capability for dependable metering and protective relaying.
- Ratio & phase angle accuracy
- Insulation resistance & tan δ / capacitance
- Burden verification & secondary wiring checks
- Winding resistance & polarity
- Induced/withstand tests (as per standard)
LA (Lightning Arrester)
Evaluates surge protection capability by monitoring insulation condition and leakage behavior under service voltage.
- Leakage current measurement & trend
- Insulation resistance
- V–I characteristics / reference voltage
- Disconnector health & earth continuity
- Visual & thermographic inspection
Isolator
Ensures safe disconnection through low contact resistance, proper alignment, and smooth mechanical operation.
- Contact resistance (DLRO)
- Mechanical operation & interlock checks
- Blade alignment & gap verification
- Insulation resistance / power-frequency withstand
- Drive mechanism lubrication & travel time