DESCRIPTION
CJC™ V30 Vacuum Filter
Drip pan mounted
Oil pump: Rotan
Vacuum pump: Busch R5
Electric control box
Flanges inlet/outlet: DN20 PN16
Supply voltage:3x230-400/440V or 1x230V
Frequency: 50/60Hz
Design temperature: 80°C
Oil Cleaning Capacity: 4.5 L/min
Weight: 150 kg
Pressure in Vacuum Chamber: 2 mbar


TRANSFORMER LIFE EXTENDING FACTORS ACHIEVED BY DEGASSING WITH A V30 SYSTEM

• The BLA 15/25 Filter Insert can hold about 800mL of water. The filter insert will act as a buffer during a time of increased water level in the oil. The filter insert can hold water corresponding to a 20 ppm increase for a transformer with 25000 L of oil.
• The V30 degassing system can remove up to 86% of all gases in one pass through the vacuum chamber. This corresponds to a maximum of 6480 L/day that can be degassed.
• Research has shown that keeping an oxygen level in the transformer oil below 2000 ppm rapidly decreases the production of CO and CO₂. Production of these gases indicate wear on the cellulose. I.E. an oxygen concentration below 2000 ppm halts the cellulose degradation. The V30 can keep a 100 T transformer oxygen free (<2000 ppm).
• Presence of water (H₂O) in the transformer system speeds up paper and oil degradation. Water is produced inside the transformer and must thus be removed in order not to accellerate the ageing. The V30 removes water from the oil very efficiently. Down to 3 ppm at 30°C. Efficiency is 80-90% at water contents above 20ppm. Most of the water in a transformer is present in the cellulose. Removing water from the oil slowly removes water from the cellulose as an equilibrium btw. oil and cellulose is reached. At an oil temperature of 30°C the V30 can remove up to 300 mL of H₂O from the oil per day.
• Particles in the oil is also an accellerating factor of the ageing rate. The BLA filter insert in the V30 system removes particles down to 0.8 µm. Particles in the oil lowers the interfacial tension (IFT). New oil has an interfacial tension of around 50 dynes per centimeter (or mN/m) and sludge begins to form when the IFT of the oil degrades to around 22 mN/m. Filtering the oil through the BLA insert keeps the IFT at a high value thus preventing sludge formation. Sludge can adhere to the cellulose insulation thus lowering the heat exchange and increasing winding temperature.
• It is a known fact that acid in transformer oil speeds up ageing. The V30 in itself does not remove acid from the oil (a CJC acid reducing filter element would), however on site measurements have shown that the water which is removed from the transformer system is acidic (pH=3.7). This indicates that water soluble acidic compounds are removed from the transformer oil using a CJC V30 degassing system.