Dry Type Transformers :

TECHNICAL FEATURES :

Manufacturing standards :
The transformers are built in accordance with IS 2026/IS 11171 and IEC 726 standards.

Core :
The core is built of cold rolled oriented grain steel with low specific losses, insulated on both sides by a thin inorganic coating (Carlyte). The sheets composing the core are cut at 45 degrees. Uniform pressing, stiffnes and solidity of the columns assure a low noise level.

High voltage windings :
The high voltage windings are realized by disc or layers, depending on the feeding voltage and transformer power. The copper conductor is NOMEX/FIREGLASS insulated or class H enamel. Adequate axial channels between the layer of windings grant an uniform cooling. Insulation between high and low voltage and core is made by fiberglass cylinders. All the winding are dryed in an oven and impregnated under vacuum by using class F/H insulating
varnishes/ Resin.

Low voltage windings :
The low voltage windings are made of copper Strip/Foil.(Above 1000 KVA) This modern technology assures an excellent resistance to electrodynamic stresses, much higher than the one obtained with traditional elix windings. The insulation between windings is obtained by using class F/H material.

Standard accessories :
# Rating and diagram plate
# Earthing terminal
# Skid under base
# Bidirectional wheels

• Primary Terminal
• Secondary terminal
• Lifting lugs.
• Enclosure with IP 21, 23 or other protection class
• Temperature monitoring unit with display.

Optional accessories :
# Over current relay
# Forced ventilation system.

Test :
All transformers are singly tested with routine test, according to standard IS 2026/ 11171 and IEC 726.

Upon request the following type test can be carried out:

• temperature rise test
• full wave impulse test.

Technical Data :

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