The JKGHYBA580 series reactive compensation measuring device is a new type low-voltage reactive-load compensation controller that integrates measurement, control and display. In comparison with the conventional low-voltage reactive-load compensation controller on the market, it mainly integrates the common voltmeter, ammeter, power factor meter, reactive power meter and active power meter into one controller. It can further display the three-phase compensating current and the capacitance switching state. The product uses the RS485 communication system and can connect at most 32 HY series combined type low-voltage electric capacitors of the company by networking.