Differences Between Copper Core and Aluminum Core Transformers
The primary difference between copper core and aluminum core transformers lies in the material of the coil. Both types have the same losses and power consumption, but their performance and suitability differ based on certain conditions:
Copper Core Transformer
- Conductivity: Copper has better conductivity than aluminum.
- Temperature Rise: Copper core transformers have a slower temperature rise compared to aluminum.
- Load Capacity: Suitable for high-load applications (80% or higher).
- Durability: Higher melting point and better performance under high load conditions.
Aluminum Core Transformer
- Conductivity: Aluminum has lower conductivity compared to copper.
- Temperature Rise: Aluminum core transformers heat up more quickly.
- Load Capacity: Not ideal for high-load applications due to the lower melting point.
- Economy: More cost-effective for applications with lower load requirements.
Recommendation
High Load: Choose a copper core transformer for better performance and reliability.
Low Load: Choose an aluminum core transformer for cost savings if the load is not high.
Daelim Transformer offers both copper core and aluminum core transformers. For further inquiries or assistance, please feel free to contact us.
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Unbalanced current in UHV transformers' differential protection circuits can arise from inconsistencies in CT ratios, CT transmission errors, excitation surge currents, and transformer voltage regulation. These issues can affect the reliability of differential protection systems. Measures to mitigate unbalanced currents include using balancing coils and software adjustments, electronic and photoelectric transformers, methods to suppress and identify excitation surge currents, and compensating for voltage regulation effects. Implementing these strategies enhances the reliability and stability of UHV transformer protection systems.
How to measure the load loss and short-circuit impedance of a transformer？
To measure transformer load loss and short-circuit impedance, apply a rated frequency sinusoidal voltage to one winding, short-circuit the others, and correct load loss to 75°C. Use voltmeters, ammeters, and power analyzers, and calculate impedance using specific formulas. Ensure accuracy by considering instrument placement and correcting measurements as needed.
What inspections are required before the transformer is put into operation?
Before a transformer is put into operation, ensure the grounding, verify protection device settings, inspect relay protection systems, confirm bushing current transformers are short-circuited, check the oil circulation cooler and breather, adjust protection settings for voltage stability, and connect the gas relay for no-load impact testing.
Differences Between NLTC and OLTC Transformers
OLTC transformers adjust voltage levels under load without power interruptions, ideal for areas with frequent voltage or load instability. NLTC transformers adjust voltage only when de-energized, making them more economical and suitable for stable voltage conditions. Choose OLTC for instability and NLTC for stable conditions.