SG series Low Voltage Dry Type Power Transformers

Design Overview

SG series Dry Type Transformer is a 3 phase, indoor, insusceptibility to moisture,compact, common core and electrostatically

shielded designed to provide a separately derived power source for computer and telecommunication equipment application.

Its function is to absorb and reduce the harmonics generated by the equipments and to protect them from electrical noise and

transient in the common modes. Due to isolation, there is no direct electrical connection between the primary and secondary

within the transformer.

SG Series Transformer is designed and manufactured to operate at 100% rated current for both linear and nonlinear odd harmonics

load up to 25th harmonic. It is capable to withstand up to 27% overload with linear load at an ambient temperatureof 40°.

Windings

Ø Copper Strips with Class H (220oC) enameled coated.

Ø Class H(NOMEX) Insulation material is used between overlapping turns or layers.

Ø Axial channels are used between layers of primary and secondary winding to provide air gap for uniform cooling.

Ø High temperature tolerant fiberglass boards are used as bobbins to separate the core and windings.

Ø Sized, transposed and shaped to minimize Eddy current losses.

Ø Sized additional 27% to carry triplen harmonics circulating current effect in the delta without overheating the transformer.

Ø Fully impregnated with class H varnish and oven dried.

Ø Electrostatic screen

Low Inrush Current

Ø Special design measures are implemented to reduce the inrush current, such as Primary winding at outer layers to

increase resistance

Ø High grade iron core with high saturation to prevent core saturation during startup

Technical Parameter

Ø Type: Autotransformer and Isolation Transformer

Ø Connection: Delta, Y, Star

Ø Power: 300VA - 600KVA (or lager range)

Ø Input voltage: Rated voltage

Ø Output voltage: Rated voltage + 5% (no-load)

Ø Regular single phase convert: 100/110/120/160/200/210/220/230/240v

Ø Regular three phase convert: 110/200/220/230/240/360/380/390/400/415/600/690/1140v

Ø Transformer convert: Single phase to single phase, three phase to three phase, three phase to single phase

Ø Note: Transformer cannot convert single phase to three phase, if need to do so, that is our frequency converter