Description

Oil Immersed Power & Distribution Transformers: We are offering conventional/sealed ONAN/ONAF/OFWF cooled, oil imme-rsed single/three phase, 50/60 Hz Aluminium/Copper Double wound, continuous duty transformers from 5 KVA to 10,000 KVA, up to 37.5 KV class with ‘A’ class insulation and designed to withstand short Circuit, Impulse & Dynamic Test.

Specification: As per ISO 2026,IEC-76, ANSI, NEPA etc(As applicable)
Product Range: 5 KVA TO 10,000 KVA
Rated Voltage: H.V. : 3.3 KV to 37.5 KV etc.,  L.V. : 230 to 11,000 V etc.

Cooling: ONAN/ONAF/OFWF, Installation: Indoor/Outdoor
Tapping: + 2.5 to -7.5% in steps @ 2.5% each - Off Circuit or with OLTC RTCC AVR arrangement for various range of voltage variation as per customer’s requirement.
Temperature Rise: 50/55ºC of oil/windings (or as per customer’s specification)
Standard Fittings & Accessories: Two earthing terminals with the earthing symbol =|, Oil level gauge indicating oil level at minimum, 30°C and maximum operating temperature, Air release device (for non-sealed type transformers), Rating and terminal marking plates, Plain breathing device for non-sealed type, Drain-cum-sampling valve (IS 554), Thermometer pocket with cap, Oil filling holes with cover (for sealed type transformers without conservator); Lifting lugs, Air filling device/pipe, Pressure relief device or explosion vent above 200 kVA, One filter valve on the upper side of the tank (for transformers above 200 kVA); Unidirectional flat rollers (for transformers above 200 kVA); Inspection hole (for transformers above 200kVA); Pressure gauge for sealed transformers with radiators (above 200 kVA); HV side neutral grounding strip, Buchholz relay for transformers above 1000 kVA., Dehydrating breather, Filter valve, Arcing horns for HT side – 3 Nos., Terminal connectors; Oil temperature indicator and winding temperature indicators for transformers above 200 kVA; Magnetic oil level gauge (for transformer above 1 600 kVA) with low oil level alarm contact; Pressure relief device or explosion vent (up to 200 kVA); Protection relay for sealed type transformers for internal parameters that is pressure, temperature, oil level and gas detection (above 1 000 kVA); ELR/ CBCT/ MCCB/ Special Marshalling Box etc as per client requirements NOTE — IS 3639 describes some of the fittings and accessories.