Transformer leak alarm

The combination of:

• an electric power transmission device selected from the group consisting essentially of a transformer, load tap changer, breaker, closure, reclosure, switch and switching bank;
• a quantity of dielectric oil for circulation through said power transmission device;
• an oil filtration unit external of said power transmission device having filter means, pump means, first oil conduit means, second oil conduit means and third oil conduit means, said first oil conduit means connecting said filter means with said power transmission device, said second oil conduit means connecting said power transmission device with a suction inlet of said pump means and said third oil conduit means connecting said filter means with a discharge from said pump means;
• electric motor means for driving said pump means to circulate said quantity of dielectric oil through said electric power transmission device, said filter means and said first, second and third oil conduit means;
• electric motor control means for energizing and de-energizing said electric motor means, said motor control means including an oil flow sensor and a first solenoid valve in said second oil conduit means;
• said first solenoid valve being closed to interrupt flow through said second oil conduit means, said motor control means being operative to de-energize said electric motor means and to close said first solenoid valve means when said flow sensor detects a value of oil flow within said second oil conduit means to be less than a predetermined value.