Frequently Asked Questions

When selecting an oil-immersed transformer, the vector group determines performance, load compatibility, and system stability.

1. Definition Inrush current is a high-magnitude transient current that flows into a transformer when it is first energized (switched on) or after a power outage recovery . It occurs due to core sa...

🔋 Initial Energization Steps Apply reduced voltage (if possible) for initial testing. Gradually increase to full rated voltage . Monitor inrush current (should stabilize within seconds). 📊 Post-E...

🌡️ Ambient Conditions Ensure dry, dust-free environment (humidity <70% recommended). Check ventilation & airflow (no obstructions around transformer). 🔌 Load & Protection Settings Conf...

⚡ Insulation Resistance Test (Megger Test) Measure winding-to-ground & winding-to-winding insulation resistance. Minimum acceptable value: >1 MΩ (typically much higher for new units). ...

Before energizing a dry-type transformer , the following critical checks and precautions must be performed to ensure safe and reliable operation . ✅ General Condition Verify no physical damage (cra...

1. Purpose Partial Discharge (PD) Test Detects localized insulation defects (e.g., voids, cracks, contaminants) that cause partial discharges (small electrical sparks) but do not immediately lead t...

Here's a professional comparison between On-Load Tap Changers (OLTC) and Off-Load Tap Changers (NLTC) in transformers: On-Load Tap Changer (OLTC) vs. Off-Load Tap Changer (NLTC) Technical Deep ...

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