An expanded dalton-cameron method: DC decay testing method at an arbitrary rotor position
✍ Scribed by Takahiro Ara; Shu Yamamoto; Hiroshi Asano; Shoichi Oda
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 273 KB
- Volume
- 123
- Category
- Article
- ISSN
- 0424-7760
No coin nor oath required. For personal study only.
✦ Synopsis
The Dalton-Cameron method is a well-known method for determining direct and quadrature axis subtransient reactance (x d gg and x q gg ) by standstill response testing. This method entails calculating x d gg and x q gg from the voltage and current measured when a rated-frequency single-phase voltage is applied to each armature winding (U-V, V-W, and W-U) in turn. The authors have developed a new method to calculate x d gg , x q gg and the impedance loci by applying a dc voltage instead of a single-phase voltage. This method was named the expanded Dalton-Cameron method. The method is a small-capacity standstill test, and is carried out by using the following three steps. The first is to short-circuit the U and V terminals while a dc current flows between these terminals, to measure the voltage and current (V DC and I DC ) when the dc current flows between these terminals and to record the dc decay current (i(t)) after these terminals are short-circuited. This same procedure is also performed for the V-W and W-U terminals in turn. The second step is to draw the impedance loci from the measured V dc , I dc and i(t) by means of Fourier transformation and to divide it into the direct-axis and quadrature-axis impedance loci (Z d (js), Z q (js)). The third step is to calculated the values of x d gg and x q gg from Z d (js) and Z q (js) and the starting performance on the basis of the two-reaction theory. Experimental and calculated results on starting performance, as well as a comparison with calculated results of x d gg and x q gg by the Dalton-Cameron method, clearly show that this method is very useful.