Power-factor improving control system

Abstract

Abstract PURPOSE: To make good power-factor control possible, by using a computer to operate effectively the phase advance function of the power-factor improving capacitor. CONSTITUTION: Computer 1 takes in required information from reactive power meter 18, power-factor indicator 19, and so on through process input/output device 2 to calculate a taking-in power-factor control quantity. Next, the decision processing for necessity of power-factor control is performed. At this time, hysteresis is provided for switching of the capacitor not to turn on and off the capacitor even if load fluctuation is generated near the point or the shut off point to change reactive power. If it is decided that power-factor control is necessary, computer 1 determines the capacitor to be switched, for example, capacitor 13 and actuates relay circuit 3 and breaker 8. In this case, since the power-factor indicator is used only for decision of phase advance and lag, reliability of data taken into computer 1 is enhanced, and accurate power-factor control is possible. Since hysteresis is provided, the operation of the breaker for some load fluctuation can be prevented. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Kunizo Sakai
• 👤 Katsuyasu Kato
• 👤 Toshio Usui

Bibliographic Details