7-10 December 2015 GlobeCore representatives were on a business trip in Kyrgyzstan. They visited Bishkek and Osh cities – presenting the equipment for purification and regeneration of transformer oil, as well as transformer maintenance.
Traditionally, the presentation consisted of two parts. At the beginning the participants were familiarized with GlobeCore equipment in oil regeneration. In the second part – a laboratory UVR unit purified the submitted samples of transformer oil. Special attention was paid to this promising technology in regeneration of insulating oil and improving operation of transformers. GlobeCore designed and developed CMM-R unit to achieve the following targets:
- protect hard insulation of transformers;
- process oil directly in an operating transformer, not switching it offline;
- reduce operating costs (a single operator is enough to control the process);
- reduce expenses for disposal of waste and purchase of new oil;
- increase dielectric strength of oil.
The CMM-R unit uses Fuller’s earth – a natural sorbent, which is restored (reactivated) directly in the unit. Thus, oil regeneration process is not interrupted for replacement of sorbent. Theoretical service life of Fuller’s earth lasts three hundred reactivations, which makes up two or three years of operation.
Besides UVB unit, GlobeCore presented and discussed other equipment:
- CMM degassing unit;
- Mojave Heat Hot Air Drying unit;
- CMM oil purification unit, and others.
Table 1 shows results of processing transformer oil through a laboratory UVR model
The results of physico-chemical analysis of transformer oil before and
after regeneration in a laboratory UVR model.
|Rated Values||Oil Analysis Results|
|for clean dry oil||for used oil||before regeneration||after regeneration|
|1||Dielectric strength not less,r 15-35 kV||30||25||10||40|
|2||Effect of the aqueous extract||neutral||0,03||0,077||neutral|
|3||Acid number, mg KOH/g||0,05||0,25||0,26||0,01|
|4||Flash point, ºС||135||135||153||150|
|7||Moisture content, g/t||absent||absent||106,7||11,4|
The laboratory established the processed oil to be operational and acceptable for further use (in accordance with the norms of Kyrgyz Republic). It should be reminded that the results were obtained on the laboratory equipment with limited capacities. When using commercial units, the parameters of processed oil can be improved even more.
GlobeCore thanks its Kyrgyz counterparts for help in organizing presentations and interest shown towards many products.