FIELD: electrical engineering.
SUBSTANCE: proposed device designed for limiting parameters of electromagnetic processes in electrical installations and power transmission lines of 6- to 220-kV insulated-neutral and 110- to 220-kV effectively insulated neutral networks has power transformer whose star-connected primary winding with neutral brought out is connected through switching unit to power supply bus system and open-delta connected secondary winding; reactor connected to secondary-winding open circuit and through high-voltage lead, to ground circuit. Device also has series-connected switching apparatus with control circuit and resistor designed for shorting out the reactor; potential transformer whose high-voltage winding is connected through one lead to neutral and through other lead, to ground circuit; switching apparatus control circuit is connected to its low-voltage winding.
EFFECT: enhanced operating reliability of networks, improved power characteristics, reduced loss and cost of protective gear.
5 cl, 1 dwg
