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Energy efficiency upgrading of old transformers usually needs replacement of high-grade electrical steel cores. Old equipment steel cores have aging performance and backward parameters.

Old transformers mostly adopt ordinary low-grade oriented steel. Their original iron loss indexes are far higher than current energy-saving standards. Long-term operation aggravates magnetic aging. Loss exceeds standard seriously.

Retaining old cores cannot meet new energy efficiency grades. Even after routine maintenance, aging steel loss cannot be reduced. Equipment cannot pass new energy-saving detection standards.

Replacing with high-grade HiB or laser scribed steel achieves obvious energy-saving effect. New ultra-low loss steel reduces no-load loss by 20% to 40%. It realizes S13 or higher energy efficiency upgrading.

Core replacement reduces long-term operation costs. Old transformers consume massive standby power every year. New high-efficiency cores save huge power consumption costs.

It also improves equipment operation stability. New electrical steel has high anti-aging performance. It avoids performance attenuation caused by aging. It extends transformer service life.

For slightly aging equipment, local core repair is optional. For seriously aging and high-loss old cores, overall replacement is the only effective upgrading method.

In conclusion, old transformer energy efficiency upgrading relies on high-grade electrical steel core replacement. It is the most direct and effective technical transformation measure.