ELPROM TRAFO CH Oil Filled Distribution Transformers 25-2500 KVA

15. Dial type - thermometer with alarm contacts(over800 kVA )

14. Dehydrating breather (for TM series)

13. Wheels

12. Buchholz relay (over 800 kVA)

11. Oil filling venting plug

10. Conservator (for TM series)

9. Lifting lugs on tank cover

8. Oil-draining and sampling valve DIN 42551

7. Oil-level gauge

6. Thermometer pocket with thermometer 3/4

5. Earthing terminal

4. Off-load tap-changer driving mechanism

3. Rating plate and diagram

2. LV Bushings DIN 42530 or cable box

1. HV Bushings DIN 42531 or cable box

STANDARD ACCESSORIES

ELPROM TRAFO CH PCL

OIL IMMERSED DISTRIBUTION TRANSFORMERS 25 2500 kVA

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subject to atmospheric influence are galvanized.

hot-dip zinc galvanized. The fitting elements (bolts, nuts, washers etc.)

operational climatic conditions. Upon request the tank and cover are

conditions. The thickness of the coating is increased depending on the

providing a long life to the transformer under tropical humid climatic

is with excellent mechanical and corrosion resistant properties thus

thickness of the protective coating of min. 60 mm is achieved which

alkyd enamel. Each coat is dried up in electric ovens. Thus a sufficient

several layers of anti corrosion primer and finished by high quality

coated by an oil resistant enamel. The outer surfaces are coated by

and sandblasted. The inner parts of the core and coil assembly are

Before assembly of the transformer all steel parts are degreased

CORROSION PROTECTION

60296.

The transformer oil is inhibited, without PCB according to IEC 296, IEC

TRANSFORMER OIL

Other upon request

Air cable box optional

side (Elastimold system) optional.

Special epoxy resin bushing and plug-in cable connector at the HV

and DIN 42530 for the LV terminals standard version.

Porcelain bushings according to DIN 42531 for the HV terminals

TERMINALS

pressure of 40 kPa.

penetrating agents in a special test field and by testing with over

Ar-CO2. High quality of the welding seams is guaranteed by tests with

movement of the transformer. Welding is done in protective atmosphere

carriage with wheels is fitted to the tank bottom allowing bi-directional

the bottom the walls are welded to the tank bottom. The transport

are welded to a flange frame to which the tank cover is bolted. At

and plasma welding produce the tank walls. In the upper part the walls

with low carbon content. Contemporary lines for automatic corrugation

structure with corrugated walls made out of cold rolled steel sheets

The standard type of the transformer tanks is rectangular a welded

TANK

thick insulation paper layer and insulation tubes and press board.

adjacent phases. The leads from the HV winding are insulated with

on it. The off-load tap-changer is situated vertically between two

active part is lifted along with the cover by the lifting eyes situated

by the tank bottom. Thus it remains stable during transportation. The

windings. The active part is fixed to the tank cover and is supported

situated outside the yokes. Axial bolts do the axial tightening of the

The upper and lower yoke are tightened by steel beams and bolts

CORE AND COIL ASSEMBLY (ACTIVE PART )

capability according to the requirements of IEC.

direction result in a high electrical, thermal and dynamic withstand

properly dimensioned insulation, effective tightening in radial and axial

most contemporary technology, the optimal selected cooling ducts,

high ratings. The optimal design of the windings and employment of

reduction of the axial electrodynamics forces at short circuit for the

of LV foil winding and multi layer HV winding results in a significant

out of copper foil for ratings 400 kVA and above. The combinations

out of profiled section copper for the ratings including 250 kVA and

winding is situated at the core limb and is foil cylindrical type made

or continuously wound disk winding for the higher ratings. The LV

for the lower ratings and two- or four-section multi-layer, block-coils

concentrically on the core limbs. The HV winding is a multi-layer one

to hot transformer oil. The windings are of cylindrical type situated

sheet. They have an insulation of cable paper or enamel resistant

99.97 conductors with round, rectangular cross-section and copper

The windings are made out of high quality copper E Cu 99.90-

WINDINGS

and a higher mechanical strength of the overlapping zones.

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OIL IMMERSED POWER / DISTRIBUTION TRANSFORMERS