Special Equipment Testing

Power Transformer Testing

Specialized Testing Services:

1. Sweep Frequency Response Analysis (SFRA):

   • Detects mechanical and electrical defects such as winding displacement, shorted or open turns, and core movement.

   • Highly sensitive method for identifying changes caused by transport, fault currents, or aging.

   • Enables comparison with reference measurements for precise condition assessment.

2. Tan Delta / Power Factor Testing:

   • Measures insulation dissipation factor (tan δ) or power factor to assess insulation health.

   • Detects moisture, contamination, and aging in windings and insulation systems.

   • Provides critical input for predictive maintenance and asset health evaluation.

3. Capacitance Measurement:

   • Determines insulation capacitance to identify abnormalities or deterioration.

   • Supports combined analysis with Tan Delta testing for complete insulation assessment.

4. Partial Discharge (PD) Testing (On-site/Offline):

   • Detects localized insulation defects and corona activity before failures occur.

   • Can be performed during operation (online) or offline, ensuring flexibility.

   • Essential for high-voltage transformers to prevent catastrophic insulation breakdowns.

5. Winding Resistance Measurement:

   • Evaluates the integrity of transformer windings and detects loose connections or overheating issues.

   • Helps identify early signs of winding deterioration or mechanical damage.

6. Turns Ratio (TTR) Testing:

   • Confirms correct voltage transformation ratios across windings.

   • Detects shorted turns, incorrect connections, or manufacturing defects.

7. Magnetising Current Testing:

   • Measures no-load current to assess core condition and detect saturation, winding issues, or magnetic anomalies.

   • Helps verify transformer performance under operational conditions.

8. Insulation Resistance and Polarization Index (PI):

   • Evaluates insulation quality over time.

   • Detects moisture ingress, contamination, or degradation of insulation materials.

9. Core Grounding and Excitation Current Tests:

   • Ensures proper grounding of transformer cores.

   • Measures excitation characteristics to identify electrical anomalies or winding irregularities.

Benefits of Specialized Testing:

• Early detection of mechanical and electrical issues, reducing risk of catastrophic failure.

• Provides actionable insights for maintenance planning and life extension.

• Enables safe and efficient commissioning and routine condition monitoring.

• Supports regulatory compliance and international testing standards.

Power transformers are critical assets in electrical networks, responsible for stepping voltage levels up or down with minimal losses while ensuring reliability and operational safety. To maintain optimal performance and prevent costly failures, specialized testing services are essential. These tests provide a comprehensive evaluation of transformer insulation, winding integrity, and overall condition, supporting predictive maintenance, commissioning, and fault diagnostics.