200kVA 33kV HV Three Phase Transformer Project

Tortech is currently in the progress of completing a 200kVA rated Three Phase Transformer in Epoxy Cast project as shown in the photos below.

This transformer will be fitted into an IP56 Enclosure with separate Input & Output compartments. The application for this project is a Solar farm in NSW.

This is a first for Tortech in terms of designing a transformer with a 33kV High Voltage winding.

The Specifications for this transformer are:
· Vector Group – Dyn11
· Frequency – 50Hz
· Input Voltage – 33kV Ph-Ph
· Output Voltage – 400V Ph-Ph
· Insulation Class – 150˚C
· Lighting Impulse Level – 200kV Peak

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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