The HKJK-3F Intelligent monitoring device is a monitor used in conjunction with the company's HED-200 on-load tap-changer electric operating mechanism. It communicates via RS485 or optical fiber to adjust the voltage of the on-load regulator transformer in manual, automatic and remote control modes.

HKJK-3F intelligent monitoring device can communicate directly with the host computer through RS485 interface, and can also realize the parallel operation of multiple on-load voltage regulating transformers.