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HV & LV wound coils are separated by means of fiber glass cylinders
& supported on the frame by special porcelain supports. HV coils are
made in disc form, using enameled & fiberglass covered copper
strips. All conductors are treated with Polyesteramide resin during
covering stage to achieve inter-turn di-electric strength of 6-8KV &
eliminating trapped mechanical forces during the thermal operating
LV coils are made from fiberglass covered copper strips & wound in
helical form. Both coils are assembled in jigs, pre compressed, dried
& encapsulated under vacuum pressure, use of mould is totally
avoided. MLRE technique of resin all around the exposed surfaces of
coils acts as protective covering to the insulated conductors & does
not prevent heat dissipation.
DRY TYPE TRANSFORMERS
Mould-Less Resin Encapsulated - MLRE Dry Type Transformer
OIL TYPE TRANSFORMERS
Each tank is pressure tested and the exterior surface coated with primer and 2 coats of weather-proof paint, the shade being dark grey 1110. 6 of IS-
5/1980. The interior is given anti-corrosive protection with oil Hesistant varnish.
Transformers are supplied with first filling of insulating oil conforming to IS-335/1980.
Voltage regulation is provided with winding tappings as per customer's specifications generally As a standard,
Tap changing is effected by means of externally hand-operated 'OFF CIRCUIT' tap-changing switch.
On-Load tap changers (OLTC) with variety of steps to offer optimum control can be offered. All tap-changing switches have indicators and locking
device. Special Multi tapping transformers are also in the product range, besides the special duty transformers.
Every transformer undergoes a series of tests throughout the manufacturing process, right from raw material stage to final stage. All routine tests are
carried out at our works as per IS 11171, IEC 726 and other International Specifications. Type tests for impulse withstand short Circuit strength , etc
have been conducted on representative ratings and voltage classes, at approved national test houses. The ISO certificate has also been revalidated
Salient Features of MLRE Dry Type Transformers
No trapped mechanical forces, improving the thermal operation
Maximum heat dissipation
Higher resistance to Short circuit forces using Disc wound coils having
self - locking property
No Partial Discharge, as max voltage appearing at any part of the winding is
limited to the turn to turn
Maximum creepage available in coils
Better monitoring of hot spot temperature
Least amount of combustible materials
Does not emit toxic and blinding smoke in the event of a fire