Overview
Transformers are mission-critical assets in your power infrastructure. At C&H Electric, our Transformer Testing services are designed to prevent failures, support code compliance, and keep your systems running smoothly. We offer comprehensive testing and maintenance that includes:
- Winding Resistance Testing
- Transformer Turns Ratio (TTR) Testing
- Transformer Cleaning, Lubricating, and Torquing
Our services align with the latest standards outlined by NFPA 70B, and OSHA, ensuring your transformers are safe, efficient, and audit-ready.
Image courtesy of Wilson Transformer. Used with reference to the original page:
‘Compact Substation’ available at wtc.com.au.
Why Transformer Testing Matters
- Why Transformer Testing Matters
- Validates proper voltage ratios and internal transformer configuration
- Supports NFPA 70B preventive maintenance compliance
- Prevents costly downtime and safety hazards
- Extends transformer life and operational performance
Transformer Testing is a key component of any predictive and preventive maintenance program.
OUR TRANSFORMER TESTING SERVICES
Winding Resistance Testing
- Applies DC current and measures voltage drop to calculate resistance
- Identifies shorted turns, carbonized contacts, or loose connections
- Verifies tap changer performance and phase balance
- Establishes a performance baseline for long-term monitoring
Transformer Turns Ratio (TTR) Testing
- Applies low-voltage signal to primary winding to measure induced voltage in secondary
- Verifies primary-to-secondary winding ratios per manufacturer spec
- Detects shorted turns, incorrect tap settings, or coil degradation
- Confirms correct transformer configuration for reliable voltage delivery
Transformer Cleaning, Lubricating, and Torquing
- Removes dust, oil, and other contaminants from internal and external surfaces
- Lubricates mechanical parts such as tap changers and cooling fans
- Re-torques all electrical connections to OEM torque values
- Maintains mechanical integrity and reduces risk of thermal failure
Winding Resistance Testing
- Applies DC current and measures voltage drop to calculate resistance
- Identifies shorted turns, carbonized contacts, or loose connections
- Verifies tap changer performance and phase balance
- Establishes a performance baseline for long-term monitoring
Transformer Turns Ratio (TTR) Testing
- Applies low-voltage signal to primary winding to measure induced voltage in secondary
- Verifies primary-to-secondary winding ratios per manufacturer spec
- Detects shorted turns, incorrect tap settings, or coil degradation
- Confirms correct transformer configuration for reliable voltage delivery
Transformer Cleaning, Lubricating, and Torquing
- Removes dust, oil, and other contaminants from internal and external surfaces
- Lubricates mechanical parts such as tap changers and cooling fans
- Re-torques all electrical connections to OEM torque values
- Maintains mechanical integrity and reduces risk of thermal failure
Our Process
Transformer Testing is a key component of any predictive and preventive maintenance program.
1. Site Evaluation
- Review transformer specs, loading, history, and environmental factors
2. Visual Inspection
- Look for damage, insulation breakdown, or contaminants
3. Electrical Testing
- Perform winding resistance and TTR testing using calibrated meters
4. Mechanical Servicing
- Clean, lubricate, and torque per OEM and industry standards
5. Reporting & Documentation
- Provide full test results, photo documentation, and clear maintenance recommendations
other preventive maintenance services
- Line Isolation Monitor (LIM) Panel Testing
- Critical Receptacle Testing
- Custom plans for Joint Commission Environment of Care or AAAHC Compliance
- Cleaning, Lubricating, and Torquing
- Contact Resistance Testing
- Insulation Resistance Testing
