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Technical requirements for voltage regulation transformers: a) Fully enclosed oil cooling. A cooling oil channel is added between the third and fourth gears on the secondary side. Top oil temperature rise of transformer: When the ambient temperature is ≤45°C, it is 5K lower than the **standard. Four lockable casters are installed under the transformer to facilitate movement. b) The silicon steel sheets for transformers are cold-rolled sheets imported from Japan with δ=0.3mm or produced by Wuhan Iron and Steel Group. The transformer oil is 25# oil produced in Karamay, Xinjiang, while the insulated wires are made from oxygen-free copper products supplied by key designated enterprises. c) Protection: The transformer is equipped with electrical contact thermometers and pressure relief valves to provide alerts for oil temperature and pressure levels. d) The maximum loss of the transformer is 1%–1.5%. e) The inrush current during primary side closing is less than 7 times the rated current. f) The design must take into account situations where the effective value of the current is constant but its peak value is high, with the worst-case duty cycle of the current waveform being 50%. g) Over-temperature trip normally open contact output ； Normal open contact output for light gas alarm ； Normal open contact output for heavy gas trip. h) The transformer has 4 operating modes: 1* tap and 2* tap operating together with 1 tap and 2* tap operating together, 1 tap and 2* tap operating together, 2* tap and 3* tap operating together, and 3* tap and 4* tap operating together.