CoruCell

CoruCell
CoruCell is an Air Cell fitted inside a conservator tank to flexibly Separate, isolate and insulate oil from the atmosphere. Benefits include: preventing contamination of gas and/or moisture from coming in to contact with the transformer oil due to oxidation and hydrolysis. The bag is vented o the transformer through flange type mounting such that it inflates or deflates to accommodate oil volume displacements due to changes in the transformer temperature.

The Air Cells are manufactured using time tested combination of Nylon (Polyamide) fabric and thick coating of Elastomers i.e. Acrylonitrile Butadiene Rubber (NBR), Polychloroprene (CR) and Hypalon (CSM). The rubber compounds are so formulated, so as to minimise separator degradation and resist leakage of air through membranes thus reducing the amount of air in the transformer oil. Over a period of time the air/gases can reduce dielectric strength and thereby accelerate the ageing of the insulation system.

Key Facts

•  Simple design with no expandable parts
• Needs negligible man hours for inspection
• Extended service life
• Economical
• Prevents corrosion
• Oil can be filled into the transformer tank without being exposed to the air
• Since insulating oil is completely isolated from the atmosphere by an air cell, there is no possibility of oxygen or moisture penetrating the oil.
• Pressure on the surface of the oil is constantly maintained at the atmospheric pressure, offering no possibility of the oil becoming supersaturated and forming bubbles; thus, high dielectric strength can be maintained.

The Technology behind CoruCell

The product design and construction of CoruCell is based on thorough analysis of the stringent and diverse environments in which they have to perform. Their constitution takes into account the various factors that affect the performance over long periods of operation. The Air Cell we manufacture incorporates the latest coating technology. Some of the most important features that make Coruba’s Air Cell exclusive are:

The Polyamide Substrate:

The textile reinforced supporting fabric is made from high tenacity Nylon yarns and designed specifically for flexible Separators. The fabric has high tear & tensile strength, high flexibility & fatigue resistance and superior dimensional stability.

The Polymer Technology:

Air Cells are manufactured by using combination of various Elastomers. The inside of the fabric is coated with combination of Olive Green-Hypalon (CSM) & Black- Polychloroprene (CR) for imparting better ozone resistance. Whereas the outer side is coated with Black- Acrylonitrile Butadiene Rubber (NBR) for providing better oil resistance. The compounds are carefully formulated to accommodate critical technical parameters such as:

• High bonding strength between rubber to fabric
• Improved temperature and ozone resistance
• Good swell and chemical resistance to transformer oil
• Crack and weathering resistance

The Coating Technology:

Unlike other manufacturers our manufacturing plant have their own fully integrated and most sophisticated manufacturing facility to produce rubber coated fabrics, which are roto-cured under automatically controlled time, pressure and temperature. This distinctively offers advantages such as:

• Higher bond strength between the polymer and fabric substrate
• Hot vulcanised seams to ensure no leakage at all times
• Guaranteed mechanical strength to fixation lugs
• Smooth glossy surface free of pin-holes and defects due to rotocuring
• Superior thickness control under tolerance of +/- 0.05 mm giving greater dimensional stability.

In-house manufacturing of accessories: Unlike other Air Cell manufacturers, all the accessories such as Flange, Sealing Tape, Rubber Strip, Diaphragm and Adhesives are made in-house under our quality control.

Quality Control

World class quality and the well-evolved rubber technology at our command is underscored by an ISO 9001 Certification and ISO 14001certification covering all major criteria i.e. Design, Development and Production. This reassures our clientele a consistent quality and on-time deliveries. Each air cell endures a four day test procedure where it is checked, rechecked and double checked for leakages under pressure and proper performance leaving no doubt in our customer’s mind regarding the dependability of the product.

Dimensions

The dimensions of the separators are based on the size of the conservator which are generally cylindrical in shape. The most used dimensions are tabulated for ready reference. Other dimensions and shapes such as elliptical, square and custom designs can also be manufactured upon request.