Three Phase DC Resistance Tester| XHZ1320AX
The XHZ1320AX three phase DC resistance tester is a next-generation rapid testing instrument developed for transformer DC resistance measurement. Integrating the saturable magnetic circuit method, three-phase testing (Yn, Y and Delta windings) and a built-in degaussing function, this new generation quick-testing device is ideal for measuring the DC resistance of large power transformers with high speed, high accuracy and a wide measurement range. Once all test wires are connected, all DC resistance test items can be completed without readjusting wires.
Applications & Target Audience: Designed for transformer manufacturers (semi-finished and finished product delivery inspection), power generation and supply utilities (preventive maintenance testing), substation commissioning teams (installation and handover acceptance tests), third-party electrical testing institutes, and industrial plants in railway, mining and metallurgy sectors that need rapid DC winding resistance verification of large power transformers.
Key Specifications
| Output Current |
Single phase: 20A, 10A, 5A, 1A, 0.1A, 10mA, <1mA
Three phase: 10A+10A, 5A+5A, 1A+1A, 0.1A+0.1A |
| Measurement Range (Single Phase) |
20A gear: 0.5mΩ~1Ω; 10A gear: 1.0mΩ~2Ω; 5A gear: 10mΩ~4Ω; 1A gear: 0.1Ω~20Ω; 0.1A gear: 2.0Ω~200Ω; 10mA gear: 50Ω~2kΩ; <1mA gear: 500Ω~25kΩ |
| Measurement Range (Three Phase) |
10A+10A: 0.5mΩ~0.8Ω; 5A+5A: 10mΩ~1.6Ω; 1A+1A: 0.1Ω~8.0Ω; 0.1A+0.1A: 2.0Ω~80Ω |
| Accuracy |
±(reading×0.2%+2 digits) |
| Winding Test Modes |
Yn, Y and Delta (Delta) windings; three-phase simultaneous test with unbalance rate calculation |
| Stability Judgment |
Automatic calculation of resistance change rate within 5s, 15s and 30s to prevent data misreading |
| Display |
7-inch industrial true color capacitive touch screen (1024×600); dual operation via full touch control or jog dial |
| Data Storage |
200 groups built-in storage; mass data storage via USB disk (FAT/FAT32) |
| Printer |
Built-in thermal printer for test report printing |
| Protections |
Misconnection to 380V power, back electromotive force, disconnection, power failure and bad grounding protection |
| Power Supply |
AC220V±10%, 50/60Hz |
| Operating Temperature |
-10°C~50°C |
| Relative Humidity |
<90%, non-condensing |
| Dimensions |
400×315×223mm |
| Weight |
9kg |
Advanced Features
- Yn-type, Y-type and Delta-type windings tested in the same way as three phases with automatic unbalance rate calculation
- Maximum output current of 20A and measurement range up to 25kΩ covering almost all on-site and off-site test demands
- Integration of saturable magnetic circuit method and degaussing function for fast and reliable measurement of large transformers
- Automatic stability judgment via resistance change rate within 5s, 15s and 30s to prevent data misreading
- Complete protections against 380V misconnection, back electromotive force, disconnection, power failure and bad grounding
- 7-inch industrial true color screen with dual operation by full touch control or jog dial
- Built-in thermal printer, 200 groups of local data storage and mass USB disk storage
- Connect test wires once to complete all DC resistance test items without readjusting wires
FAQ
Q1: What is the maximum output current of the XHZ1320AX three phase DC resistance tester?
The single-phase output current ranges from 20A down to <1mA (20A, 10A, 5A, 1A, 0.1A, 10mA and <1mA gears), while the three-phase output supports 10A+10A, 5A+5A, 1A+1A and 0.1A+0.1A, covering both large and small power transformers.
Q2: Which winding connection types can be tested?
Yn-type, Y-type and Delta-type windings can all be tested. Three-phase simultaneous testing is supported and the unbalance rate of the three phases is calculated automatically, which greatly improves field testing efficiency.
Q3: Does the tester support degaussing?
Yes. The instrument integrates the saturable magnetic circuit method and a degaussing function, making it ideal for rapid DC resistance measurement of large transformers while eliminating residual magnetism effects on test accuracy.
Q4: What protections are built in for on-site safety?
The tester provides comprehensive protections against misconnection to 380V power, back electromotive force, test wire disconnection, sudden power failure and bad grounding, ensuring safe operation in harsh field environments.
Q5: How are test results stored and printed?
Up to 200 groups of test data can be stored locally and mass data can be exported through the USB interface (FAT/FAT32 format USB disk). A built-in thermal printer allows instant test report printing at the job site.
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