| 摘要 |
FIELD: electricity.SUBSTANCE: device to protect equipment of a power AC system comprises the first facility (15), configured with the possibility to measure frequency of current and voltage in at least one location (16) in the power system along an interconnection between two abstract electric machines of an equivalent two-machine system. The fourth facility (19) configured as capable of using the values of frequency of the measured current and voltage to determine whether there is power oscillation in the power system, and if the power oscillation has been determined, to determine whether the location (16) of measurement is at the side of the electric motor or the side of the generator of a potential electric centre of pole slipping along the interconnection. Besides, the electric centre is determined as the location, when the voltage becomes zero during pole slipping, and sending this information additionally into the third facility (20) for use in control for protection of equipment of the power system.EFFECT: improved reliability.19 cl, 12 dwg |
