Title :
Self excitation of induction motors compensated by permanently connected capacitors and recommendations for IEEE Std 141-1993
Author :
M. Ermis;Z. Calir;I. Cadirci;G. Zenginobuz;H. Tezcan
Author_Institution :
TUBITAK-METU Inf. Technol. & Electron. Res. Inst., Ankara, Turkey
Abstract :
Self-excitation of induction motors compensated by permanently-connected capacitors is investigated in this paper. Theoretical analyses of self-excitation phenomenon are carried out by using some simplified equivalent circuits, and a hybrid mathematical model in ABC/dq axes, respectively in steady-state, and transient-state. An unusual operating condition of water pumping stations is reported, in which water within the pipeline may drive the motor in the reverse direction at speeds higher than synchronous, when a supply interruption coincides with a check valve failure. In order to prevent the motor from dangerous overvoltages due to self-excitation, it is recommended to connect a simple static protection circuit consisting of a resistor in series with a thyristor switch between any two lines of the motor. Critical resistance boundaries which will lead to loss of excitation, and demagnetisation of the rotor core are determined separately as a function of operating speed. A suitable resistance value chosen in the safe design area constitutes a reliable protection mechanism against self-excitation.
Keywords :
"Induction motors","Synchronous motors","Protection","Switches","Capacitors","Equivalent circuits","Mathematical model","Steady-state","Pipelines","Valves"
Conference_Titel :
Industry Applications Conference, 2000. Conference Record of the 2000 IEEE
Print_ISBN :
0-7803-6401-5
DOI :
10.1109/IAS.2000.882613