High voltage electric power metering box (no electricity meter) said the combined transformer oil-immersed outdoor communication type (also applies to indoor), is a direct measurement of high-voltage lines in the active and reactive power measuring equipment, and is suitable for rated frequency 50 HZ or 60 HZ,35 KV, 3 KV three-phase ac power system network, it has high precision, light weight, easy installation and preventing electricity-stolen, etc, are very popular with the general power supply departments, to prevent power, save energy and enhance the management of power supply has a major role.