HYG-230 three-phase intelligent phase volt-ampere meter is a multi-functional intelligent instrument specially designed for field testing. It consists of host, current clamp (3), test line (4), etc. The host uses 3.5 inch true color LCD screen, graphical menu interface display, vector diagram indication, at a glance. Current clamp integrated handle design, easy to operate, is very suitable for places with intensive wiring. The instrument can measure three-phase AC voltage, current, phase between voltage, phase between current, phase between voltage and current, phase between voltage and current, frequency, phase sequence, active power, reactive power, apparent power, power factor, current vector sum, distinguish transformer wiring group, inductive and capacitive circuit, test secondary circuit and bus differential protection system, read and read. In order to provide a safe, accurate and convenient intelligent instrument for power inspectors, it is necessary to check the phase relationship between CT of each group, the connection of watt-hour meter and the maintenance of circuit equipment. It is suitable for electric power, petrochemical industry, metallurgy, railway, meteorology, industrial and mining enterprises, scientific research institutes, measurement departments, etc. Especially suitable for electric energy billing system and relay protection system.