TRANSFORMER-TYPE ELECTRIC HEATER Russian patent published in 2004 - IPC

FIELD: fast water heating appliances. SUBSTANCE: device has three-phase laminated electric steel core whose legs carry aluminum-wire primary winding. Three- phase single-turn short-circuited secondary winding made of nonmagnetic electricity conducting tubes is used as heating element. Novelty is that secondary winding of proposed device is specifically designed so that its short- circuited turn in each phase has active and passive sections. Active section is wound directly on core phase leg. Passive section is wound on all three legs of transformer core; it is made in the form of two parallel conductors whose ends are connected to active section. Short-circuited turns of phases are series-connected with respect to water flow and are shorted out by welds. EFFECT: enhanced safety and operating reliability of device. 1 cl, 2 dwg