An auxiliary transformer is a specialized step-down transformer used in power plants, substations, and railway systems to supply low-voltage power (such as 230V or 415V) to essential support equipment, control circuits, cooling fans, and lighting rather than managing bulk transmission power.
Core Functions
Voltage Reduction: Steps down high voltages (like 11kV, 220kV, or railway 25kV) to safe, usable levels for local plant services.
Powering Auxiliaries: Runs critical infrastructure like oil pumps, water cooling systems, ventilation, and coal-handling motors.
Control and Protection: Supplies continuous energy to switchgear, monitoring sensors, automation panels, and safety relay circuits.
Station Services & Black Starts: Keeps baseline station utilities alive and aids in system restoration during a total blackout.
