Zinc oxide arrester live detection device free of external connection with alternating-current power supply

The invention belongs to the technical field of gapless zinc oxide arrester live detection in an electric system, in particular to a zinc oxide arrester live detection device free of external connection with an alternating-current power supply. The zinc oxide arrester live detection device free of external connection with the alternating-current power supply comprises a current collecting unit, an amplifying unit, a single-chip microcomputer, a keyboard, a displayer and a printer. The current collecting unit has the A-phase, the B-phase and the C-phase, wherein the A-phase, the B-phase and the C-phase of the current collecting unit are connected with the amplifying unit. The output end of the amplifying unit is connected with an A/D conversion channel of the single-chip microcomputer. A bus of the single-chip microcomputer is connected with the keyboard, the displayer and the printer in sequence. The zinc oxide arrester live detection device free of external connection with the alternating-current power supply can complete on-site detection of three-phase arresters at the same time in one-time measurement and has the remarkable advantages that testing operation is convenient, site interference is small, and data repeatability is good; the zinc oxide arrester live detection device free of external connection with the alternating-current power supply further has the remarkable advantages of being suitable for arrester live tests under different site conditions in a transformer substation and out of the transformer substation, capable of accurately judging the operation state of the arresters, high in measurement accuracy, wide in application range, convenient to use and low in maintenance cost.