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Step Down Transformer Connection

Step down transformer is transferring the higher voltage of input end to lower ideal voltage so that the voltage can be stepped down.

Frequency characteristic: low-frequency; phase number of power supply: single phase

Iron core figure: E  Methods for cooling: dry-type  Iron core figure: centrifugal  The number of winding: duplex winding  The way of dampproof: open-type

Type of cooling: naturally air-cooled

Outline structure: vertical electricity

Pressure ratio: 220/110(v)

Efficiency(η): 95

Rated power: 50-10000(KVA)

Input end voltage of step down transform: 460V, 380V, 220V, 400V.

Outlet-voltage: 380V, 220V, 110V, 36V, 24V.

Principle of control: Auto-induction voltage-reduced starting is a starting method to reduce voltage of motor end by autotransformer. Autotransformer can get different outlet-voltage from two sets of taps( 80% and 50% of common supply voltage), when it starts, one set of tap will use 65 percent tap to connect with loop of electromotor. When its speed of rotate is close to rated speed, remove autotransformer so that electromotor can full-voltage start by connecting electromotor with three-phase supply.