Medium Voltage Distribution Transformers

A medium voltage distribution transformers is a transformers that provides the final voltage transformation in the power distribution system, stepping down or up to the voltage used in the network lines to the level used by the end-users such as industrial and commercial properties like offices, homes, and large factories. There are two types of distribution transformers according to cooling type: dry-type transformers and oil-filled transformers (also known as liquid-filled transformers). A cooling method is important to stop the transformers from overheating and becoming a potential fault. Overheating is inevitable when transformers are under load, but it must be solved because temperature rises are not acceptable when transformers are being used.

Salient Features of Distribution Transformers

Modern distribution transformers incorporate some salient features that make them suitable for the demanding requirements of power distribution:

1. High efficiency: Careful design optimization ensures very low losses during energy transfer resulting in high efficiency of over 97%. This keeps electricity costs low by reducing wastage.

2. Reliability: Stringent quality control in design, raw materials and manufacturing results in highly reliable units that provide trouble-free service for over 25 years.

3. Overload capability: Short-term overloading above the rated capacity is supported to account for occasional spikes in demand.

4. Protection features: Inbuilt devices protect the transformers from issues like overheating, voltage spikes, short circuits etc.

5. Minimal maintenance: Robust sealed tanks with long-life insulating oil minimize maintenance requirements.

6. Compact footprint: Pole-mounted transformers utilize minimal ground space.

7. Low environmental impact: Distribution transformers utilize non-toxic, biodegradable vegetable-based oil instead of mineral oils.

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