可変リアクタと移相器を用いた三相回路(非接地方式)の電流平衡装置
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概要
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When a single phase or three phase unbalanced load is applied to a three phase balanced power system, an unbalanced line current is set up at the power system. Consequently, this has undeniable effects on generators, transformers and many other apparatus connected on the power line. Therefore, many sorts of current-balancing device have been invented to avoid those bad influences on apparatus on the system and most of these devices is made up of a variable reactor and a capacitor or a phase shifter and a capacitor. In this paper, a new type of current-balancing device consisting of a phase shifter and two variable reactors is reported and discussed on. In this device, two variable reactors are connected to T type connection as shown in Fig. 1 and a phase shifter has an unbalanced load on its secondary side. To keep the current at the power source in balance, it is necessary to control both the phase angle of a shifter and the reactance of a variable reactor. And to obtain the balanced current, first, the shifter must be controlled so that a particular phase angle, in Which the primary current of the shifter has a relation of I_a' = I_c' > I_b', is found within the range from 0° to 180° of the shifter. Next, adjusting the reactance of a reactor on phase b, the balanced current can be obtained at the power source smoothly. By operating the shifter, regardless of any kind of unbalanced loads which exists on a circuit, the unbalanced factor of the primary current in the shifter becomes about 30 (%). Then, it is quite easy to gain 0 (%) unbalanced factor by regulating the reactor. In this study, so many tests were performed at the range of the unbalaced factor of a load current from 19 (%) to 100 (%). Authors were able to obtain a satisfactory result in these experiments and attained the first purpose of the investigation.
- 明治大学の論文