LK103D3 Intelligent terminal is specially designed for horizontal vacuum on-load tap changer, forming an automatic voltage regulating power supply system with on-load transformer. The power supply voltage is stable within the range required by users, and the power supply voltage is not affected by the external voltage fluctuation and the load change, and the power supply quality and the safety of the electrical equipment are improved. The terminal has triple-phase voltage, current and power acquisition functions, can store 5000 event records, with wifi module, can be controlled through a mobile phone APP. Moreover, it has an RS485 interface, which, after being connected to distribution integration terminal,can realize wireless data transmission and intelligent applications in distribution areas. The terminal adopts aluminum alloy fully closed enclosure, with a protection level of IP65.