Power & Distribution Transformer Testing

Power & Distribution Transformer Testing:

Power and distribution transformers play a crucial role in electrical power systems, and their proper functioning is essential for the reliability of the power supply. Testing transformers helps ensure their performance, efficiency, and safety.

Common tests on power and distribution transformers:

Insulation Resistance Test:

1. To ensure the integrity of the insulation system.
2. Apply a DC voltage across the windings and measure the insulation resistance.

Turns Ratio Test:

1. To verify the turns ratio and check for any winding disconnections.
2. Apply a known voltage to the primary winding and measure the voltage on the secondary winding.

Polarity Test:

1. To confirm the correct polarity of windings.
2. Apply a low voltage to one winding and determine the induced voltage in the other windings.

Winding Resistance Measurement:

1. To measure the resistance of transformer windings.
2. Measure the resistance of each winding using a low-resistance ohmmeter.

Magnetic Balance Test:

1. To ensure the magnetic balance of three-phase transformer windings.
2. Measure the voltage across each phase and verify that they are balanced.

Vector Group Test:

1. To identify the vector group of the transformer.
2. Apply a known voltage to the primary winding and measure the phase angle between primary and secondary voltages.

Short Circuit Test (for Power Transformers):

1. To determine the impedance and losses under short-circuit conditions.
2. Short-circuit the low-voltage side and apply a reduced voltage on the high-voltage side while measuring the current and losses.

Open Circuit Test (for Power Transformers):

1. To determine core losses and magnetizing current.
2. Apply rated voltage on the low-voltage side with the high-voltage side open, and measure current and losses.

Dielectric Strength Test (e.g., Hipot Test):

1. To assess the dielectric strength of the transformer insulation.
2. Apply a high voltage for a specified duration between windings and between winding and ground.

Oil Testing (if oil-filled):

1. To assess the condition of the insulating oil.
2. Tests may include Dielectric Strength, Moisture Content, Dissolved Gas Analysis (DGA), and other oil quality tests.

Partial Discharge Test:

1. To detect partial discharges in the insulation.
2. Apply a voltage higher than normal operating voltage and monitor for partial discharges.

It's important to follow international standards and specifications for transformer testing, such as those provided by the International Electrotechnical Commission (IEC) or the American National Standards Institute (ANSI). Additionally, testing should be carried out by qualified personnel to ensure accurate and reliable results

Contact us today to learn more and schedule your Power and distribution Transformer service.

You can get any of the following:
📞 01977-426642
📧 info@iconic.com.bd
🌐 www.iconic.com.bd

Learn More: Partial Discharge (PD) testing