DEVELOPMENT OF ADVANCED CONTROL STATE TECHNOLOGY OF TRANSFORMER AND ELECTRIC MOTOR WINDINGS BASED ON PULSED METHOD

Power transformer’s park is rapidly aging around the world. Delayed and inaccurate diagnosis of transformer state leads to electrical energy system accidents with severe consequences. At the present day no one famous technique can supply exact transformer winding diagnostic. FRA method is popular enough in American and European electrical systems, but important diagnostic frequency range of it is restricted by 2 MHz. As result, diagnostic mistake by FRA take place despite progress in this technology. As for electric motor windings, it is no one real control state technology except its resistance measurement. New approach to transformer and electric motor winding state control technology is described. Proposed method is based on rectangular pulse of nanosecond (350-400 ns) duration using. It is shown that smaller probe pulse duration allows making a winding state control and increasing a precision of winding diagnostic. Method was experimentally used on real power transformer 63 MVA and AC electric motors.