GENERAL DESCRIPTION
Oil-immersed distribution transformers are important equipment in the distribution network and power supply and distribution systems of industrial & mining enterprises. It has the advantages of compact structure, beautiful appearance, small size, low noise and strong overload capacity.
33kv class three phase oil-immersed distribution transformer has hermetically sealed type and conservator type. The transformer is applicable to plant, mine, petrol chemical and other power distribution system of 10kv class for industry and agriculture. They are also popular in sites with oil contamination and chemical substances.
TRANSFORMER SPECIFIC DETEAILS
• HIGH VOLTAGE TAP CHANGER
The adjustment or variation of the primary voltage is obtained by oil immersed linear tap changers maneuverable with the transformer disconnected from the network by using knobs placed on the cover. To avoid an incorrect positioning of the tap-changers, holes are provided in correspondence with each indication notch. Thus, the secure housing of the knob is guaranteed in each of the various positions.
If required, the transformer may also be equipped with linear and compact on-load tap changer (for Voltage Optimization Local Transformers) or traditional types with oil-contacts or vacuum contacts, which regulate the voltage variation on energized transformers.
Pearl Electric offers transformers equipped with any make of on-load tap changer in the market also for small power range.
• INSULATING LIQUIDS
The filling of the transformers is obtained with mineral oil, without PBC, dried and degassed, with electrical and chemical specifications, which conform to GB and IEC standards; the filling is done under-vacuum for the best oil electrical rigidity withstand. If required the tank can be filled with silicon oil and FR3 vegetable oil.
• STANDARD ACCESSORIES AND OPTIONAL ACCESSORIES
STANDARD ACCESSORIES
• Oil conservator mounted on the tank top cover (for non-hermetically sealed transformers)
• Oil level indicator on the conservator(for non-hermetically sealed transformers)
• HV regulation tappings±2x2, 5% wired to off-circuit tap changing switch with external operating handle
• HV screwed, fully insulated porcelain bushings, 3 off
• LV Porcelain bushings, 3 off line terminals plus Neutral bushing
• Oil filler cap
• Oil drain valve requirements
• Bi-directional floor rollers
• Rrating and name plate
• Lifting lugs/eyebolts
• Earthing terminals
• Thermometer pocket
OPTIONAL ACCESSORIES
• Gas and oil operated Buchholz relay with 2 electrical contacts
• Dehydrating breather(for non-hermetically sealed transformers)
• Oil level indicator contacts on the conservator (for non-hermetically sealed transformers)
• Pressure relief valve
• Protection system DGPT2 or RIS(for hermetically sealed transformers)
• Thermometer with 2 electrical contacts
• Protection housing IP 55 for LV bushings
• Protection housing IP 55 for MV bushings
• Antivibration pads for wheels
• Pressure relay with 2 electrical contacts
• Electrostatic screen between primary and secondary voltage Skids for pole mounted transformers
TECHNICAL DATASHEET FOR 33KV OIL FILLED TRANSFORMER
Model | H.V(kV) | L.V(KV) | Uk(%) | P0 [W] | Pk[W] |
S-50/33 | 33 | 0.4 | 4 | 168 | 875 |
S-63/33 | 33 | 0.4 | 4 | 224 | 1260 |
S-100/33 | 33 | 0.4 | 4 | 272 | 1505 |
S-160/33 | 33 | 0.4 | 4 | 384 | 2170 |
S-200/33 | 33 | 0.4 | 4 | 456 | 2520 |
S-300/33 | 33 | 0.4 | 4 | 576 | 3815 |
S-400/33 | 33 | 0.4 | 4 | 638 | 4638 |
S-500/33 | 33 | 0.4 | 4 | 700 | 5460 |
S-630/33 | 33 | 0.4 | 4 | 825 | 6430 |
S-800/33 | 33 | 0.4 | 4 | 1015 | 7700 |
S-1000/33 | 33 | 0.4 | 4 | 1222 | 9450 |
S-1250/33 | 33 | 0.4 | 4 | 1500 | 11700 |
S-1500/33 | 33 | 0.4 | 4 | 1785 | 13860 |
S-1600/33 | 33 | 0.4 | 4 | 1950 | 14900 |
S-2000/33 | 33 | 0.4 | 4 | 2736 | 15750 |
S-2500/33 | 33 | 0.4 | 4 | 3400 | 16300 |
