Transformer Testing Services
Ensuring Performance, Reliability, and Safety of Power Assets

Transformers are critical components in the power distribution and transmission network. To ensure their continued reliability, efficiency, and safety, routine and comprehensive testing is essential. At Delwit Engineering Ltd, we provide professional transformer testing services tailored to meet the operational, regulatory, and maintenance needs of our clients across residential, commercial, industrial, and utility-scale installations.

Our transformer testing services are designed to identify potential faults, verify performance parameters, and ensure compliance with technical standards before or during operation. Whether it’s part of a commissioning process, scheduled maintenance, or diagnostic assessment, our tests are conducted with precision, using calibrated equipment and guided by regulatory standards.

Scope of Transformer Testing Services

Our transformer testing solutions include, but are not limited to:

  1. Insulation Resistance Testing (Megger Test):
    Evaluates the quality of insulation between windings and the core, helping prevent short circuits and failures.
  2. Turns Ratio Test (TTR):
    Confirms that the voltage ratio between the primary and secondary windings matches design specifications.
  3. Short Circuit Test

Helps to determine the transformer’s equivalent resistance, reactance and copper losses which are important for estimating voltage regulation and efficiency under various load conditions.

  1. Winding Resistance Test:
    Measures the resistance of transformer windings to detect issues like shorted turns or loose connections.
  2. No-Load Loss and Current Measurement:

Assesses the losses and current drawn by the transformer when operating at no load, which is important for efficiency calculations. 

  1. Polarity and Phase Relation Test:
    Ensures correct phase alignment and polarity for safe and synchronized system integration.
  2. Dielectric Breakdown Voltage (BDV) Test of Transformer Oil:
    Assesses the insulating strength of transformer oil, critical for cooling and insulation.
  3. Vector Group Test:

Determines the phase relationship between the primary and secondary windings, ensuring proper connection to the electrical system. 

  1. Earth/Ground Resistance Testing:
    Verifies that the transformer is safely grounded to prevent electrical hazards and equipment damage.
  2. Temperature Rise Test:

Evaluates the temperature rise of the transformer windings and oil under load conditions, ensuring it operates within acceptable temperature limits. 

  1. On-Load Tap Changer Test:

Tests the functionality and performance of the on-load tap changer, which allows for voltage regulation under load. 

  1. Thermal Imaging and Load Testing (on request):
    Detects hotspots and evaluates performance under simulated or actual load conditions.

Why Choose Delwit for Transformer Testing?

  • Experienced Professionals:
    Certified engineers and technicians with extensive field expertise.
  • Advanced Equipment:
    We utilize modern, calibrated instruments for precise and reliable testing.
  • Regulatory Compliance:
    All tests are conducted in line with NEMSA, NERC, and IEC standards.
  • Detailed Reporting:
    We provide clear, comprehensive test reports with actionable insights and recommendations.
  • Flexible Deployment:
    Available for on-site testing of distribution and power transformers at client locations.

Trust Delwit Engineering Ltd to help you minimize downtime, extend equipment lifespan, and maintain a safe electrical environment through thorough transformer testing.

📧 Contact Us Today
Email: [email protected]
Phone: +234-803-9233-787

Delwit Engineering Ltd
Your Reliable Electrical Partner!!!