I. Overview

The HZ-109S3 (220V) model utilizes ARM chip-controlled output technology and a high-capacity toroidal transformer. It is equipped with an LCD screen that simultaneously displays primary and secondary currents as well as the transformation ratio. Housed in an aluminum alloy casing with a PC panel, the device features an elegant appearance, high output capability, compact size, and light weight. It is primarily suitable for high-current testing applications in power systems.

II. Specifications

2.1 Input Power: AC: 220V·80A, 50Hz;
2.2 Output Current: AC: 3000A·5V or 1500A·10V;
Primary Current Range: 0-3500A, Resolution: 0.1A;
Secondary Current Range: 0-6A, Resolution: 0.001A;
2.3 Accuracy: True RMS (0.3% of reading + 0.2% of full scale);
 

III. Working Principle

The circuit is shown in the figure below. The AC:220V power supply is input through X₁₁ ａnd X₁₂, regulated by the TY voltage regulator, and the current is stepped up by the T current transformer. The high current is output through the current transformer at X₁ and X₅. When the two sets of coils are connected in parallel for output, they can deliver a current of 3000A at a voltage of 5V; when the two sets of coils are connected in series for output (i.e., with the connection plate in the middle), they can deliver a current of 1500A at a voltage of 10V.

The ARM controller processes data display and control output from the mouse and signal board.