TWO-CASCADE VOLTAGE TRANSFORMER WITH INTELLIGENT PROTECTION FROM OVERLOAD MODES AND SHORT CIRCUIT CURRENTS Russian patent published in 2008 - IPC H02J9/06 

FIELD: electric engineering, in particular, voltage transformers.

SUBSTANCE: voltage transformer consists of serially connected module for two-channel transformation of direct current voltage to direct current voltage, receiving power from main and backup direct current voltage network, with galvanic decoupling of input and output circuits of transformer (DC/DC module - first cascade of two-cascade transformer) and module of one-channel transformation of direct current voltage to alternating sinusoidal current voltage (DC/AC module - second cascade of two-cascade transformer) with software and hardware protection from overload modes and short circuit currents. The invention may be used for uninterruptible provision of electric power with highly stable voltage of alternating sinusoidal currents to important consumers of various objects (mobile and stationary) of industrial and military purposes with dynamically changing load. Claimed technical solutions are practically realized.

EFFECT: in suggested voltage transformer two voltage transformation cascade ensure technical effect - full independency of qualitative characteristics of output voltage on load from parameters of powering networks, management of temperature of power equipment of transformer and protection of power equipment from overheating, increased reliability of operation of hardware short circuit current protection circuit, selectivity and intelligence of protection complex (protection of long-term overload modes, protection from overheating, protection from short circuit currents), local and remote management of transformer operation is possible, reliable protection of power circuits of transformer from effect of impulse high voltage overvoltages is ensured and, as a consequence, efficiency of operation of transformer as a whole is increased to ensure maximally possible reliability of provision of electric power to important load.

4 cl, 2 dwg