Patent ID: 7033513

Claim:
A filter system for filtering oil from a transformer device, comprising: a pump to draw oil from a reservoir external to the filter system and introduce it into the filter system under pressure; a first fitting directing flow from said pump, said first fitting able be disconnected without permitting significant oil leakage under a condition of applied pump pressure; a filter to remove contaminants from the oil urged through it from said first fitting; a second fitting directing flow from said filter, to allow said filter to be disconnected without permitting significant oil leakage under a condition of applied pump pressure; and a return line to return filtered oil to a reservoir external to the filter system, wherein the filter system further comprises a motor to power said pump; wherein the filter system further comprises a control system to control the time intervals during which said motor powers said pump; and wherein the pump, the filter, the motor and the control unit are attached together to form a subassembly; and an attaching device for attaching the subassembly to the transformer device to completely support the subassembly on the transformer device.