METHOD AND SYSTEM FOR PREVENTION AND PROTECTION AGAINST EXPLOSION AND FIRE IN ELECTRIC TRANSFORMER Russian patent published in 2010 - IPC H02H5/06 H01F27/14 

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering, namely, to early prevention, protection and/or detection of explosion and/or resulting fire of electric transformer. System comprises one ore several electric relays of differential current to detect difference of input current and output current in wires of high and low voltage with ceiling level and supply of the first input signal to control unit, if ratio of input current to output current exceeds previously specified limit. Gas relays detect excess discharge of oil in transformer to supply in this case the second input signal to control unit. Mains switches receive input signals from electric relay of differential current and gas relay and supply. Control units receive specified first, second and third input signals and generate control signal that arrives to lifting electromagnet for its connection and drainage of oil via drain valve with further blow of inertial gas from the bottom of electric transformer tank via valve of nitrogen exhaust, in order to mix oil, to reduce its temperature and content of oxygen, in order to prevent explosion and/or resulting fire in electric transformer.

EFFECT: invention provides for early detection of fuel cooling fluid/dielectric oil decay.

12 cl, 3 dwg