Distribution & Power Transformer
Distribution Transformer
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A distribution transformer is the one which is employed for reducing the high voltage to a low voltage level suitable for the distribution and utilisation. Distribution transformer is used to step down (reduce) the high voltage to the low voltage for supplying consumer’s load. Distribution transformer are installed on the poles near the load centres (consumer’s end). In actual practice, the distribution transformers only step-down (reduce) the voltage level. For a distribution transformer, the primary winding is connected in delta while the secondary winding is connected in star to provide neutral point for single-phase purpose. A distribution transformer has single primary winding and the secondary winding may be single or tapped. A distribution transformer is smaller in size. Distribution transformers operate during load and no-load periods. Distribution transformers are designed to withstand high load fluctuations. Distribution transformers are designed with small leakage reactance. Distribution transformers are used to distribution electrical power to the consumers.
Power Transformer
Power transformer is the type of transformer which have high power handling capacity with the high voltage ratings and used in the transmission section of the power system.Power transformer are used to increase the level of voltage to a high value for transmission of the electric power over the long distances. Power transformers are installed at the generating
station and transmission substations, i.e. they are installed in the transmission section of the power system. Power transformers are mostly used for stepping up (increase) the voltage level, but step down is also possible. For a power transformer, both the primary and secondary windings are connected in delta. However, in some special cases (like generating transformer) the primary is connected in star with neutral earthed and the secondary is delta connected. Power transformer has relatively larger size.
Power transformers operate only during the load periods. Power transformer has high flux density. Power transformers always operate at full load. Power transformers have maximum efficiency at full load.Power transformers are designed with high leakage reactance. Power transformers are employed for step-up and step-down (rarely) in generating stations, receiving stations,substations, etc.
Standard Fittings
- T. Bushing I L. T. Bushing
- Conservator Oil Filling Hole
- Off Circuit Tap Charger
- Earthing Terminals Pads
- Bottom Filter Valve
- Top Filter Valve with Sampling Plug
- Oil Level Gauge
- Rating Diagram Plate
- Air Release Valve
- Thermometer Pocket
- Lifting Lugs
- Pressed Steel Radiators
- Explosion Vent
- Silica Gel Breather
- First Filling of Oil
- Isolating Valves For Radiator
- Jacking Pads
- Dial Type OTI with Alt Contacts
- Buchholz Relay With A/t Contacts
- Marshalling Box with Control Wiring
Technical Specifications
| Duty, Type | Outdoor / Indoor |
| Voltage Class | 11, 22, 33 KV or any specific |
| No of Phases | 3 phase |
| Frequency | 50/60 Hz11, 22, 33 KV or any specific |
| Vector Group | Dyn5 or Dyn11 or YNynO any specific |
| Insulating Fluid | PCB FREE Mineral Oil, both inhibited & uninhibited, as per IS/IEC, ASTM 03487 |
| Class of Insulation | Class A |
| Duty, Type | Outdoor / Indoor |
| Tap Changer | Off circuit or On load tap changer |
| Tapping Range | ± 2.5% X 2 for OCTC or + 1.25% X 4 & – 1.25%X 8 for OLTC or as per customer requirement |
| Winding Material | Copper with multi paper covering |
| Applicable Standards | IS 11801, IEC 60076, ANSI, IEEE |
| Painting | Enamel, Epoxy, Polyurethane or customer specific |