This recommended practice covers the application of fuses and relays for protecting power transformers used in industrial and commercial power systems against damage from overloads and short circuits. Primary substation transformers rated between 1000 kVA and 12 000 KVA with secondary voltages between 2 400 and 13 800 V, and secondary substation transformers rated between 300 kVA and 2500 kVA with secondary voltages of 208 V, 240 V, or 480V are covered. Larger and smaller transformers may also be protected by the devices described in this recommended practice.
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