低速度短絡試験による三相同期機の界磁電流の決定方法
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概要
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Determination of field current of a synchronous generator at a specified load is an important problem from the practical point of view. Two methods are now recognized as the most accurate ones. They are the method using Potier diagram (Clause 31 of IEC Publication 34-4) and the method using ASA diagram (Clause 32 of IEC Publication 34-4). However, the results obtained by these methods are sometimes not accurate enough for practical purposes.In this paper, a new accurate method of determination of the field current is proposed.In the case when the rated power factor is unity, the field current at rated load can be determined, in principle, from the measurements of field current in the low-speed short-circuit test carried out at an appropriate speed. In practice, it is convenient to determine the field current by the interpolation of the results of low-speed short-circuit tests carried out at two slightly different speeds. In the case when the rated power factor is not unity, the field current at rated load can be determined as the sum of two components, that is, the measured field current for a fictitious unity-power-factor rated load and the field current component which is necessary for compensating the difference of direct-axis armature magnetomotive force at the true rated load and that at the fictitious rated load.Method for determining field current of a synchronous motor is also treated herein.It has been proved experimentally that the new method gives fairly accurate results compared with those obtained by the other methods.
- 社団法人 電気学会の論文
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