VOLTAGE STABILISER AT PLANT'S TRANSFORMER SUBSTATIONS Russian patent published in 2015 - IPC H02M5/12 H02J3/14 

FIELD: electricity.

SUBSTANCE: voltage stabiliser at the plant's transformer substations is referred to electric engineering, in particular, to electric energy systems, and may be used for stabilisation of voltage for transformer substation consumers at industrial and agricultural facilities where electric heaters are envisaged for auxiliary heating of the premises, water, etc., as well as production facilities of beef, dairy and food industries where continuous delivery of steam is required for technological processes. The three-phase voltage stabiliser comprises a booster transformer and two three-phase keys with common control system. Primary windings of power transformers at the main and auxiliary plant's substations are connected to the network through the primary winding of the booster transformer, secondary windings of power transformers at these substations are connected to the plant's consumers, the secondary winding of the booster transformer is coupled by its one outputs to the auxiliary electric heater and the first three-phase key and by its other outputs to the secondary winding of the power transformer at the auxiliary substation intended for the plant's auxiliaries and the main electric heater is connected to it. The auxiliary electric heater is made of two series heating elements with the second three-phase key connected to their connection points, the control system is made to generate control pulses for the first and second three-phase keys and sequential regulation of their duration from the commutating period up to zero, at that for the first key when control signal is changed from positive value up to zero and then for the second key when control signal is changed from zero up to negative value, at that the control signal is delivered to the control system from input of the output voltage deviation sensor at the main substation feeding the most crucial consumers of the plant.

EFFECT: sound energy management in result of improved quality of voltage and current at input and output of the transformer substations and reduction of the associated losses, as well as improved shape of voltage for consumers and improved accuracy and speed of its maintenance at the preset level in result of essential decrease in depth of boost voltage modulation.

4 cl, 1 dwg