| 摘要 |
FIELD: electricity.SUBSTANCE: method for alternating current machine rotor protection from eccentricity is based on measurement of parameters of the machine magnet field and generation of a tripping signal. The signal with measured parameters of the alternating current machine magnet field is converted to a single-polarity signal, and harmonic components are extracted from it with frequencies f(?-1/p) and f(?+1/p). When a value of at least one frequency exceeds the first threshold value then a signal is generated about the rotor eccentricity. When a value of at least one frequency exceeds the second threshold value then a signal is generated about tripping of the machine from the network, where ? has the value of 0, 1, 2?; p is a number of poles, f- frequency of the main harmonic network. Usage of this method allows timely determination of a critical value of the rotor eccentricity and disconnection of the machine from the network and thus reduction of time and costs for post-fault repair for any such machines with any number of the poles.EFFECT: expanding functional capabilities and the area of application, increasing sensitivity.3 dwg |
