22kV cast resin distribution transformers
Fire resistant : Cast Resin transformers have an inherently safe characteristic of self fire-extinguishing and fire resistance. So there would be no fear of spread of fire even if a fire took place in nearby equipment.
The transformers can be used indoors without fear of fire, and it is not necessary to provide additional measures for safety.
Ignited for 2 minutes on the surface of cast coil with acetylene torch.
As the torch was removed from the surface of burning resin.
The flame extinguished by itself after 15 seconds.
Maintenance Free : Maintenance is almost completely eliminated. No checking of liquid level and no yearly dielectric test for moisture absorption is required. Due to the smooth coil surfaces, heavy dirt and dust build up is eliminated even under the worst circumstances. The recommended routine maintenance is an occasional visual or Infra-Red thermal inspection.
Environmentally Safe : Power-Cast transformers will not emit oil or toxic gases into the atmosphere. Therefore, they do not pollute the environment and are recommended strongly as a replacement for askarel filled (PCB) transformers. PCB is poisonous, chemically aggressive and can discharge dangerous gases at elevated temperatures.
Low Noise : The encapsulation of the core in a special resin and the design of the clamping mechanism have provided an appreciable noise reduction. Noise is also reduced due to the sound suppressing effect of the elaborate core cutting and the coil support elastic structure.
Cost Saving : If the advantage of Power - Cast transformers is taken into consideration at the planning stage, the overall costs of a power supply system can often be considerably reduced. They are sufficiently compact for convenient installation in a building where space is generally limited and have much smaller power loss than oil immersed and dry-type transformers. Total costs are lower even though cast resin transformers may be more expensive than other transformers. Cost savings add low maintenance and longer operating life in all conditions.
Fewer Failures : Standard Insurance Company studies have shown failure rates in cast coil transformers to be less than 5% that of standard dry type transformers in some applications.
22kV cast resin distribution transformers are available with specification as follows :
HV coil : Up to 24kV LVcoil : 0.48-4.16 KV
*Power-Cast transformers with multiple high voltage connections can also be supplied.
Standard : ±2.5%, ±5% Other ratings are available by arrangement.
Single phase : 20 - 2,000 KVA Three phase : 50 - 10,000 KVA
Frequency : 50Hz, 60Hz Typical % impedance voltage : 4-8%.
HV coil : Delta LVcoil : Wye with neutral point
* Other connections are available to meet requirements.
HV coil : Class F LVcoil : Class F
Max. ambient temperature : 450 C Temperature rise limitation : 1800 C
Power-Cast transformers conform to the requirements of IS STANDARDS. However they can also meet the requirements of the following standards, upon request : Accessories Normally Provided Accessories :
Terminal screws and links for HV taps
Ground wire clamping screw
Protective cap for HV taps
Special Accessories :
Cooling fans and control relay
No partial discharge
High overload capability
Superior Impulse voltage strength
Short-circuit damage resistance.
Thermal shock resistance
Superior fire resistant design
Very low noise
Very low operating cost.
Cast Resin transformers can be used in various fields. Here are just a few possible applications :
Indoor or outdoor unit substations
Industrial and petrochemical plants
Extremely corrosive and dirty applications
Low noise applications
SCR power supplies
Grid, ring or radial networks
Pad mount applications.
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refer to more details: https://www.cnrockwill.com/article/cast-resin-type-dry-power-transformer.html