Three Phase Transformer DC Resistance Tester| XHZ1320AX
The XHZ1320AX DC resistance tester uses advanced switching power supply and precision measurement technology, with a high-speed microcontroller as the core, high-speed A/D converter and program-controlled current source technology to achieve unprecedented measurement effect and highly automated measurement function. It is a new generation product for measuring DC resistance of inductive equipment such as transformers and motors.
For Yn, Y and Δ connected windings, the instrument can perform three-phase measurement simultaneously and automatically calculate the three-phase unbalance rate. The maximum output current is 20A with a measuring range of 0 to 25kΩ, satisfying the testing needs of most transformers. It combines magnetizing (auxiliary excitation) method and automatic demagnetization function in one unit, meeting multiple field testing requirements. The industrial-grade 7-inch true color touch screen with one-key flywheel operation provides a comfortable and convenient human-machine interaction experience.
Applications & Target Audience: The XHZ1320AX is positioned as a three-phase DC resistance tester for distribution and medium-small power transformer manufacturing, installation and maintenance scenarios, distinct from SFRA winding deformation analyzers, short-circuit impedance testers and oil testers in the same category. It is engineered for transformer manufacturers' factory test and semi-finished product inspection lines, power installation companies performing acceptance tests on newly installed transformers, motor manufacturing and repair enterprises, and industrial users such as petroleum and mining companies conducting DC resistance testing after transformer overhaul.
Key Specifications
| Parameter |
Specification |
| Output Current (Single Phase) |
20A, 10A, 5A, 1A, 0.1A, 10mA, <1mA |
| Output Current (Three Phase) |
10A+10A, 5A+5A, 1A+1A, 0.1A+0.1A |
| Measuring Range (Single Phase) |
0.5mΩ ~ 25kΩ (20A: 0.5mΩ-1Ω; 10A: 1-2Ω; 5A: 10mΩ-4Ω; 1A: 0.1-20Ω; 0.1A: 2-200Ω; 10mA: 50Ω-2kΩ; <1mA: 500Ω-25kΩ) |
| Measuring Range (Three Phase) |
0.5mΩ ~ 80Ω (10A+10A: 0.5-0.8Ω; 5A+5A: 10mΩ-1.6Ω; 1A+1A: 0.1-8Ω; 0.1A+0.1A: 2-80Ω) |
| Accuracy |
± (0.2% reading + 2 digits) |
| Resolution |
0.1μΩ |
| Display |
7-inch industrial true color touch screen, 1024 x 600 |
| Data Storage |
200 sets internal memory + USB mass storage |
| Power Supply |
AC220V ± 10%, 50/60Hz |
| Operating Temperature |
-10ºC ~ +50ºC |
| Relative Humidity |
< 90%, non-condensing |
| Dimensions (LxWxH) |
400 x 315 x 223 mm |
| Weight |
9 kg |
Advanced Features
Three-phase measurement for Yn, Y and Δ windings, with automatic three-phase unbalance rate calculation;
Maximum output current 20A, measuring range 0 to 25kΩ, satisfying the testing needs of most transformers;
Combines magnetizing (auxiliary excitation) method and automatic demagnetization function in one unit, meeting multiple field testing requirements;
Automatically calculates the resistance change rate within 5S, 15S and 30S, helping operators judge data stability and prevent misreading;
Multiple protection functions: back-EMF protection, broken-line protection and power-off protection;
Equipped with thermal printer, 200 sets of built-in data storage and USB mass storage;
Industrial-grade 7-inch true color large screen with full touch control and one-key flywheel operation;
With audible discharge alarm, the discharge instructions are clear and reduce misoperation;
Fast response speed, the on-load tap-changer can be directly converted in the measurement state, and the instrument automatically refreshes the data;
Intelligent power management technology, the instrument always works in the minimum power state, effectively reducing internal heating and saving energy;
Comes with perpetual calendar clock and power-off storage, test data can be consulted at any time.
Standards & Compliance
The XHZ1320AX is a high-precision, wide-range, highly automated DC resistance tester with stable data, good repeatability, strong anti-interference ability and fast charge-discharge speed. It is an ideal product for measuring DC resistance of transformers in power generation and power supply units, transformer manufacturing industry, and large and medium-sized power consumption enterprises.
Each unit is delivered with a warranty certificate and after-sales service support, and customization is available to match specific project requirements.
FAQ
Q1: What is the XHZ1320AX used for?
It is a new generation DC resistance tester for inductive equipment such as transformers and motors. For Yn, Y and Δ connected windings, it performs three-phase measurement simultaneously and automatically calculates the three-phase unbalance rate, making it ideal for transformer factory testing, installation acceptance and overhaul testing.
Q2: What are the output current and measuring range?
Single phase output current: 20A, 10A, 5A, 1A, 0.1A, 10mA and <1mA; three phase output current: 10A+10A, 5A+5A, 1A+1A and 0.1A+0.1A. The measuring range covers 0.5mΩ to 25kΩ for single phase and 0.5mΩ to 80Ω for three phase, satisfying the testing needs of most transformers.
Q3: Does it support magnetizing and demagnetization?
Yes. The instrument combines the magnetizing (auxiliary excitation) method and automatic demagnetization function in one unit. The demagnetization test supports high-voltage AB, BC and AO phases with demagnetization currents of 1A, 5A and 10A, meeting multiple field testing requirements.
Q4: How does it help judge data stability?
The test process automatically calculates the resistance change rate within 5S, 15S and 30S, which assists test personnel in judging the stability of test data and preventing misreading. The three-phase unbalance rate is also calculated automatically.
Q5: Is it convenient for field use?
Yes. It features an industrial-grade 7-inch true color touch screen (1024 x 600) with full touch control and one-key flywheel operation, Chinese menu prompts, a thermal printer, 200 sets of built-in storage and USB mass storage. It weighs 9kg with dimensions of 400 x 315 x 223 mm and operates at -10ºC to +50ºC.
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