This is a selection of questions that we at Redragon are often asked

 

   A. Yes. The TORS series of transformer oil regeneration systems fully removes corrosive sulfur including elemental sulfur. It is important to realize that regenerating the oil must be continued to the endpoint to fully remove sulfur as it is one of the last contaminants to be removed.

 

   A. Usually this comes down to the vacuum pump package. It is not uncommon for a vacuum pump package to comprise as much as 25% - 30% the price of a degasing system. The HVD series of High Vacuum Degasifiers from Redragon offers you a choice in vacuum packages. The impact of this is typically reflected in the number of passes required to achieve the desired oil parameters. The bigger the vacuum package the lower the number of passes required to do the job but the higher the capital cost of the degasifier.

 

   A. This is due to the fact that there are several different and acceptable testing methods in use globally, e.g. ASTM, IEC, each will produce a different value on the same oil sample.

   A. Yes, both the TORS and HVD systems have the option to work online using the optional TOLMS or Transformer Oil Level Monitoring System. This system also allows most other manufacturers degasifiers to be converted to an online system as the TOLMS can also be supplied as a standalone system.

 

   A. Yes, we do. We are able to train and assist your equipment operators at your site, or your client's site, on both offline and online oil processing.

 

   A. Oil-lubricated compressors have both the compressor crankcase and the gas pumping chamber lubricated by oil. Clearly this compressor exposes the pumped SF6 gas to oil contamination. Redragon does not use oil-lubricated compressors. Oil-less compressors have sealed bearings in the crankcase and non-oil lubricated pumping chambers. Oil-free compressors have oil lubricated crankcases and non-oil lubricated pumping chambers, isolated by triple-seals from the crankcase, preventing any oil contamination of the SF6 gas being pumped. Redragon uses oil-less and oil-free compressors for a guaranteed contamination free gas.

 

   A. Yes, in most cases we can repair, service or upgrade other manufacturers oil processing and SF6 gas processing equipment.

 

- Q. Can your SF6 systems cater to new EPA requirements for weighing SF6?

   A. Yes, all of the Redragon SHX-series of gas processing carts can be fitted with accurate loadcells for precise control of gas inventory.

 

   A. A Roots booster is not required for oil processing; it should only be used when vacuuming a transformer. There is a danger of negatively impacting transformer oil qualities by using too high a vacuum, too high a temperature or a combination of the two - the oil viscosity will increase with the subsequent removal of light-ends, reducing the oil's efficiency to cool the transformer.

 

   A. Yes. We offer our DOF-series. These small versions of high vacuum degasifiers are designed to run unattended for periods of weeks at a time. They have a relatively low flow rate compared to the transformer oil volume and are optimised to not only reduce the core mositure content but to degasify the transformer, removing reactive oxygen from inside the transformer environment and slow down the aging process - something non-vacuum systems cannot do.