The OLTC series of online tap changer filters is used to remove particulate and water from insulating or dielectric oils in a load tap changer. It is designed to be permanently attached to a oil filled electrical device such as tap changers, transformer, or circuit breakers. With the use of a suitable cartridge acids can also be removed from the oil.

The OLTC filter is controlled by a micro PLC whose operation can be optimized be the user for individual tap changers.

This is the first stage required to remove the solid contamination. The filtered oil is fed into a vacuum chamber where, due to the reduced pressure above the liquid, dissolved water is vaporized. The reduced pressure also facilitates the removal of any entrained gases in the oil.  

Typical specification