1. Overview

The three-phase oil-immersed high-voltage power metering box (hereinafter referred to as the metering box) is suitable for use in three-phase AC networks with a rated voltage and a rated frequency . It consists of two parts: a combined transformer and a meter box. , type metering box is suitable for rural drainage and irrigation stations, [same number for mobile phone WeChat ] high-voltage transmission lines for township enterprises, processing plants, small and medium-sized factories, mining areas, transportation and other enterprises and institutions, as well as forestry and infrastructure construction sites. Metering of power generation in small power stations or metering of power grids when the power grid of small power stations is connected to the country to transmit power between power sources.

2. Main structure

, This product consists of a combined transformer and a metering instrument box. The combined transformer is assembled by two voltage transformers and two current transformers. The metering meter box is equipped with a series of three-phase meter and safety device. When measuring one-way, it is equipped with an active meter and a reactive meter. When measuring two-way, it is equipped with two active meters and two reactive meters.

The core of the voltage transformer is external iron type, and is stacked with high-quality cold-rolled oriented silicon steel sheets. The central column is multi-stage stepped, and primary and secondary coils are installed on the central column.

, the core of the current transformer is internal iron type, and is stacked with high-quality cold-rolled oriented silicon steel sheets, and primary and secondary coils are installed on the iron core columns.

, the voltage and current transformers are drawn out at one time through the conductive rod in the porcelain sleeve for wiring. The voltage and current transformers are fixed on the pallet, which is hoisted on the box cover by supporting rods and immersed in transformer oil.

The instrument box is installed on the front of the fuel tank, with a viewing window and a lead seal hole.

, the complex-change ratio metering box adopts a secondary replacement-change ratio complex, which facilitates more indirect and efficient work when changing the ratio.

, the complex-change ratio measurement principle adopts / wiring method, the secondary point in the voltage loop is grounded, and the tail end of the phase current secondary loop in the current loop is grounded. Inside the complex ratio metering box, the tail end of the current secondary circuit and the tail end of the voltage secondary circuit are connected to one point, but are not grounded. When actually connecting to the meter to measure, this point ( ) should be reliably grounded.