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.
