This model combined transformer (another name is metering tank) is composed of voltage and current transformer. It is applied to three-phase circuit of AC 50HZ or 60HZ and rated voltage being 10kV or lower.

Voltage transformer possesses indoor epoxy resin casting mechanism. The primary and iron core is installed onto center post. Current transformer possesses indoor epoxy resin casting mechanism. Its iron core is closed with rolling mechanism of super-quality grain-oriented cold-rolled silicon steel sheet.

Two voltage transformers (PT) and two current transformers (CT) are installed into one sealed iron box, forming one body.