A winding resistance tester measures several critical parameters that can reveal underlying transformer issues:

1. Resistance of Windings: This primary measurement helps assess the condition of transformer windings. Variations from standard resistance values can indicate loose connections, inter-turn shorts, or even partial winding deformation, which can reduce efficiency and signal potential failure risks.

2. Temperature of Windings: Transformer resistance varies with temperature, making it essential to measure winding temperatures. By knowing the winding temperature, technicians can normalize resistance values to standard conditions, providing a reliable comparison to manufacturer specifications or baseline data.

3. Stabilization Time: Achieving stable resistance readings requires the transformer windings to reach thermal and electrical equilibrium. Measuring stabilization time ensures the winding has settled to a steady-state, eliminating errors due to transient conditions, particularly in large or heavily loaded transformers.

4. Applied Test Current and Voltage: Monitoring test current and voltage allows technicians to verify that the applied test conditions align with industry standards. Correct current and voltage settings are crucial to ensure accurate readings without damaging sensitive transformer windings.

Each of these measurements plays a role in detecting faults such as shorted turns, loose connections, or physical damage. Regular resistance testing with these parameters helps prevent transformer failures, optimize maintenance, and extend transformer life.

Nov 06,2024