Abstract
The paper rationalizes the relevance of the development of a high-voltage ac motor starter that is simple in construction, low cost and energy effective. It also presents the calculated oscillograms of the electromagnetic transient moment, when the reactor or across-the-line starting of a motor takes place, and the oscillograms at various initial conditions of switching the motor to the supply-line voltage. It is estimated how the timing of switching the engine to the supply-line voltage influences the oscillation of the electromagnetic transient moment at the final stage of the reactor start. The paper also verifies the possibility of the switch process implementation with an almost complete elimination of the oscillation of the electromagnetic transient moment and discusses the ways of solving the problem of the soft switching of a reactor device with a soft start to the line voltage. The idea and the scheme of the implementation of a hybrid thyrister-reactor of a motor starter is estimated and discussed. The role of the high voltage thyristor switch considered as a device of short time action that provides some practical elimination of the oscillation of the electromagnetic transient moment when switching to the supply-line voltage, is rationalized as well. The paper discusses the results of simulating the system “Reactor start device as an induction motor”, verifying the possibility of complete elimination of the oscillation of the electromagnetic transient moment when switching the engine to the supply-line voltage at any stage of the starting process.
Keywords
Asynchronous motor, reactor start-up, transient electromagnetic moment, oscillation, favorable switching point, reactor-thyristor device.
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