A kind of micro-porous aluminosilicate sorbent was prepared to carry out regeneration treatment for the used mineral transformer oil

the conventional diatomite and silica gel sorbents were also applied as the reference sorbents.The results show that

after being treated by the micro-porous aluminosilicate sorbent

the regenerated transformer oil became lighter in color

and it had no sludge precipitation.Moreover

its indexes such as the dissipation factor

acid number

volume resistivity and interfacial tension all satisfied the requirements for oil quality of 500 kV devices in GB/T 7595—2008Quality of transform oils in service

and were all superior to that of the oil treated by the conventional diatomite and silica gel sorbents.The recycling of used mineral transformer oil was realized.