An experimental investigation of a reactor-type current limiter by cancellation of a noninductive state with power semiconductors
✍ Scribed by Masaru Isozaki; Koichi Nakamura; Takashi Morita
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 358 KB
- Volume
- 132
- Category
- Article
- ISSN
- 0424-7760
No coin nor oath required. For personal study only.
✦ Synopsis
This paper presents experimental results on a new type of current limiter using a model current limiter. This type of current limiter consists of a reactor with two coils reverse wound so as to maintain the noninductive state in the core. A parallel circuit with a power semiconductor switch and a resistor is connected to one of the two coils in series. Maintaining the noninductive condition by turning on the semiconductor switch during the normal loading state, theoretically there is no voltage drop across the limiter, that is, the impedance of the limiter remains at zero. The limiter has a current limiting impedance value during current limiting performance under short circuit conditions. The principle is that, when turning off the semiconductor switch, the resistor is inserted in the circuit, so that the noninductive condition is canceled. The effects of the turn ratio of the reactor winding and the characteristics of the inserted resistor with linear and nonlinear characteristics are experimentally studied. The normal current through a semiconductor is reduced by taking a high winding turn ratio of the coil connected to a semiconductor. On the other hand, the voltage across the semiconductor terminals during the current limiting period increases in proportion to the winding turn ratio of the coil. The current limiting impedance and energy absorption of nonlinear resistors during the current limiting period are numerically analyzed and compared, and a method to determine the optimum winding ratio is proposed.