Features

Isolation transformers can be used to provide galvanic isolation between input and output windings. These transformers can be built with an interwinding earth screen.

This screen is effective in attenuating common mode noise present in the supply. Isolation transformers are commonly used for testing, centralised grid connected PV inverter(MV Split winding transformer),UPS isolation, Railway and Defence applications.

All dry type transformers are routine tested to AS 60076.11. Special type tests such as temperature rise and impulse tests can also be prepared.

Tortech Isolation transformers are custom manufactured tailored to customer specific requirements.

Typical designs include the following features

  • Amorphous and CRGO steel for ultra low core loss and high efficiency for Solar applications
  • Non grain core design for low remanence flux density for applications with specific in-rush current requirements
  • Aluminium or Copper sheet/rectangular windings for economical solution
  • Dry type Air natural natural transformers are available with PT100 temperature probe and controller
  • ISO-9000 Quality control system. Mitted core construction and core clamping for protection under short circuit conditions

Other designs are available and can be tailor made to meet your requirements

Please find ratings of typical isolation transformer specifications below:

LV/HV VOLTAGE RATINGS

0.2-1 kV

RATED POWER

1-500 kVA

FREQUENCY

50/60 Hz

INSULATION CLASS

F (155°C)/H(180°C)/C(220°C)

NO LOAD TAPS

±2.5%, ±5%

VECTOR CONNECTIONS

Dyn11/ YNyn11, Dy11y11, Yz1, Yz11

ENCLOSURE RATINGS

INDOOR: IP23 MILD STEEL 
OUTDOOR: IP56 MILD STEEL, IP56 STAINLESS STEEL 316 (MARINE GRADE)

STANDARDS

AS 60076:2008 DRY TYPE POWER TRANSFORMERS

TEMPERATURE CONTROLLER

OPTIONAL PT100 TEMPERATURE PROBE & CONTROLLER

NOISE LEVEL

<60 dB

ALTITUDE

DESIGNS AVAILABLE FOR <1000m, <2000m, <3000

INSTALLATION

C CHANNELS, LIFTING LUGS

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Item 1 – Cast Resin type Isolation Transformer

HV Winding 1

LV Winding 1

LV Winding 2

Rated power

kVA

315

1250

1250

Rated voltage

kV

33

0.48

0.48

Frequency

Hz

50

Off circuit tapping links

%

±2.5%, +-5%

Nil

Nil

Connection

Delta

Star

Star

Vector group

Dy11y11

Insulation level (Maximum BIL/AC)

kV

150/70

10/3

10/3

Winding material

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Type of winding

Vacuum Resin Cast

Vacuum Resin cast

Vacuum Resin cast

Standard

AS 60076-11, AS 2374

Installation

Indoor

Degree of protection

IP22

Type of cooling

AN/AF

Installation altitude

< 1000 a.m.s.l

Climatic/environmental

And fire behaviour class

E2-C2-F1

test