UVV Vacuum cold trap

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Oil refrigeration cold trap system is designed for evacuation and drying of solid insulation of power transformers with voltages 110-1150 kV during installation, service and repairs.

The vacuum cold trap can be used with transformers capable of withstanding 26 Pa pressure. Application of the unit for transformers which cannot withstand 26 Pa pressure is possible after reinforcement of the tank authorized by the transformer manufacturer.

While drying solid insulation of power transformers with voltages from 500 to 1150 kV, the evacuation from atmospheric pressure to 400 Pa may be accelerated by connecting a vacuum blower section to the unit.

Oil refrigeration system can dehydrate solid insulation by circulating hot dry oil. First, the oil is heated to 80-85 ⁰C, and then it passes through a drying and filtration unit. The essence of this method is the diffusion of moisture from the outer layers of insulation into the dry oil with the following removal of the moisture by the drying unit.

Parameter

Value

Rate of vapor-gas mix evacuation from transformer tank at residual pressure from atmospheric to 400 Pa, liters/second, min

27×3=81

Rate of vapor gas mix evacuation from transformer tank at residual pressure from 400 Pa to 26 Pa, liters/second, min

500

Residual pressure created by vacuum pump in transformer tank, max 26
Residual pressure in the unit during air leak test, Pa, max 4
Air leak in one hour, Pa, max 100
Water vapor condensation surface temperature, °С/ °F, max -70/-94
Residual moisture content in solid insulation, %, max 1.0
Cold generation capacity (at -70°С/-94F), W 600
Condensation surface area, m2, min 6.1
Defrosting system power consumption, kW 2.1
Nominal power, kW 21
Power supply voltage at 50Hz/ 60Hz, V (fully customizable on request) 380
Dimensions, mm/ft, max
• length

• width

• height

1700/5’57’’

1600/5’25’’

1950/6’4’’

Weight, kg/lbs, max 2100/4,641

  • the vacuum section is equipped with vacuum pump heating and cooling devices for operation in a wide range of temperatures completely unaided;
  • equipped with vane vacuum pumps, which require no separate heating or cooling and are less noisy;
  • all component are installed inside a single frame.

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