THE EFFECTS OF ADJUSTABLE ELECTRIC DRIVES OF MINE HOISTING EQUIPMENT ON THE ELECTRICITY QUALITY IN THE POWER SUPPLY CIRCUITS Journal title: Електромеханічні і енергозберігаючі системи Authors: Oleg Sinchuk, Yuliy Filipp, Mihail Maksimov, Ruslan Zaytsev Subject(s): Engineering, Energy, Mechanical Engineering, Mechanics