Concept of reactive power Under normal operation condition,appliances not only absorb active power,but also reactive power.If the reactive power is not enough,then electromagnetic field cannot be built,causing the decrease of voltage,hence affecting the operation of appliances. Reactive power may affect the power system in following aspects: 0 (1)reduce the active power output of generator (2)reduce the power delivery capability of transmission and transformers (3)increase the voltage loss and power loss on transmission line (4)cause voltage drop and operation under low power factor condition,under which the nominal capacity cannot be fully used 电力拿镜广城洲量写控制四川省童点实验蜜 国家电网电力系统广域测量与控制四川省重点实验室 Concept of reactive power  Under normal operation condition, appliances not only absorb active power, but also reactive power. If the reactive power is not enough, then electromagnetic field cannot be built, causing the decrease of voltage, hence affecting the operation of appliances.  Reactive power may affect the power system in following aspects:  (1)reduce the active power output of generator  (2)reduce the power delivery capability of transmission and transformers  (3)increase the voltage loss and power loss on transmission line  (4)cause voltage drop and operation under low power factor condition, under which the nominal capacity cannot be fully used