Current Transformer (CT) Testing
Current Transformers (CTs) are essential for stepping down high current levels to manageable values for metering and protection devices. At SLPL, we deliver precise and comprehensive CT testing services to ensure accuracy, safety, and compliance with grid and industry standards.
What is CT Testing?
Current Transformers serve a dual purpose—accurate current measurement and safe operation of protection relays. Faulty CTs can lead to incorrect readings, relay malfunctions, and dangerous system conditions.
Our CT testing procedures ensure that these transformers perform optimally, enabling:
Accurate current measurement for energy billing
Reliable relay coordination during faults
System safety and operational compliance
We test CTs across various voltage levels—from LV to EHV applications in switchyards, substations, and industries.
Tests Conducted on CTs
- Insulation Resistance Test
- Polarity Check
- Ratio Test
- Excitation (Knee Point) Test
- Burden Test
- Secondary Winding Resistance Test
- Accuracy Class Verification