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PROTECTION OF AN ASYNCHRONMOTOR VOLTAGE-INVERTER DRIVE BY INTERDICTION OF THE INVERTER FIRING
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| Author(s) |
S. Halasz; M. M. El-Sayed; T. Molnar; K. Veszpremi |
| Abstract |
The paper is dealing with investigation of the transient operation occuring during interdiction of the inverter thyristors (transisitors, GTO's) firing after motor overcurrents. The analytical calculation was carried out by neglecting the motor Ohmic resistance, the calculations were checked by accurate computer examinations. Finally the calculations were compared with measurements. Both calculations and tests were proving that after the firing prohibition of the inverter semiconductors the motor stator current - depending on the working point - is coming to an within 1-2 ms at PWM inverters and within 1-10 ms at simple (six steps) inverters. For generator operation the current is coming to an end in much greater time interval and this causes a considerable increase of the D.C. voltage of the inverter. |
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| Filename: | Unnamed file |
| Filesize: | 585.9 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-09 by System |
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