Special Equipment Testing

Instrument Transformers Testing

Specialized Testing Services:

1. CT Analyzer Testing:

   • Measures ratio, polarity, excitation characteristics, burden, and knee point of current transformers.

   • Detects winding saturation, magnetization issues, and accuracy deviations.

   • Ensures reliable performance for protection and metering applications.

2. PT / VT Ratio and Phase Angle Measurement:

   • Verifies voltage transformation ratios and phase displacement.

   • Confirms accurate voltage delivery for metering and relay systems.

3. CVT Capacitance and Tan Delta Testing:

   • Measures capacitance and dissipation factor (tan δ) to assess insulation quality.

   • Detects moisture ingress, contamination, and insulation aging.

4. Secondary Winding Resistance Measurement:

   • Verifies continuity and integrity of secondary windings.

   • Identifies loose connections, corrosion, or partial winding failures.

5. Insulation Resistance Testing:

   • Measures insulation integrity between windings and to ground.

   • Essential for safe operation under rated voltage conditions.

6. Polarity and Phase Displacement Verification:

   • Confirms correct orientation of primary and secondary windings.

   • Ensures proper coordination with metering and protection systems.

Benefits of Specialized Testing:

• Guarantees accurate and reliable measurement for protection and metering

• Detects early signs of insulation deterioration and winding issues

• Supports commissioning, preventive maintenance, and condition-based monitoring

• Reduces operational risk and enhances network reliability

Instrument transformers play a vital role in electrical power systems, providing accurate measurement and isolation for metering, protection, and control applications. Maintaining their performance is critical for reliable operation of protection relays, metering systems, and control circuits. Specialized testing services for CTs, PTs, VTs, and CVTs ensure precise measurement, insulation integrity, and proper operation under rated conditions. These tests help identify faults, degradation, or abnormal behavior before they impact the network.