Transformer DC Winding Resistance Tester For Temperature Rise Heat Run Test
HZ-3220A Transformer DC Winding Resistance Tester for Temperature Rise Heat Run Test
I. General Introduction
The DC resistance test of transformers is required during factory tests of semi-finished and finished products, and again at installation, acceptance, and preventive maintenance by electric power departments.
The test identifies improper coil material, welding defects, loose connections, missing or broken strands, and other manufacturing or in-service faults.
Temperature-rise testing
Series-connected constant-current testing of high- and low-voltage windings is unsuitable for temperature-rise tests on power transmission transformers when the two windings have a large resistance difference. Using two separate instruments in that case can damage the equipment through mutual induction between the windings.
Instrument design
This tester uses a dual constant-current source, CPU-programmed charge and discharge sequences, and protection circuits. It is built for temperature-rise testing of transformers whose high- and low-voltage windings differ widely in resistance.
II. Performance Characteristics
High output current (up to 20A) and wide measurement range (up to 2kΩ), suitable for DC resistance and temperature rise tests of 35kV-class and below transformers.
Dual power supply design supports simultaneous or independent testing of high and low voltage sides.
Integrated protection functions: AC380V input misconnection alarm, wire breakage protection, anti-arcing protection, and audible discharge alarm. Clear indicators and robust protection circuits enhance reliability and prevent misoperation.
Large color touchscreen for intuitive operation and clear data display.
Automatic printing of temperature rise test reports at set intervals, with built-in data storage for easy recording.
Built-in perpetual calendar; stores 100 sets of standard test data and 3 sets of temperature rise test results. Data retention after power-off; includes a USB port for data export and temperature rise curve generation.
RS485 communication interface enables remote control and measurement with upper-computer software.
Includes temperature rise analysis software for automatic data processing and curve plotting.
III. Technical Specifications
| Item | Specification |
| Output Current | High Voltage CH1: 5A, 1A, 0.3A, 0.1A, 0.01A |
| Low Voltage CH2: 20A, 10A, 5A, 2A | |
| Measurement Range | CH1 (5A): 0–4Ω |
| CH1 (1A): 20mΩ–20Ω | |
| CH1 (0.3A): 60mΩ–60Ω | |
| CH1 (0.1A): 200mΩ–200Ω | |
| CH1 (0.01A): 2–2000Ω | |
| CH2 (20A): 0–0.1Ω | |
| CH2 (10A): 2mΩ–0.4Ω | |
| CH2 (5A): 4mΩ–0.8Ω | |
| CH2 (2A): 10mΩ–2Ω | |
| Accuracy | CH1: 0.2% ± 1μΩ |
| CH2: 0.2% ± 0.2μΩ | |
| Minimum Resolution | 0.1μΩ |
| Temperature Rise Recording Interval | 5–90s (configurable in 5s steps) |
| Operating Temperature | -20°C to 40°C |
| Ambient Humidity | ≤80% RH (non-condensing) |
| Power Supply | AC 220V ±10%, 50Hz ±1Hz |
| Dimensions | 360mm × 280mm × 170mm (L × W × H) |
| Net Weight | 8kg |
System Description
Refer to figure one for front panel of the instrument.
1. Liquid crystal display screen: display selection item and testing data, and touch control operation.
2. Low voltage end CH2 I-： CH2 current output terminal at low voltage end.
3. Low voltage end CH2 V-: CH2 voltage measurement input terminals at low voltage end.
4. Low voltage end CH2 V+: CH2 voltage measurement input terminals at low voltage end.
5. Low voltage end CH2 I+： CH2 current output terminal at low voltage end.
6. High voltage end CH1 I-： CH1 current output terminal at high voltage end.
7. High voltage end CH1 V-: CH1 voltage measurement input terminals at high voltage end.
8 High voltage end CH1 V+: CH1 voltage measurement input terminals at high voltage end.
9. High voltage end CH1 I+： CH1 current output terminal at high voltage end.
10. Power supply switch: Switch on and switch off power supply of whole machine.
11. Printer: Print current, resistance and auxiliary information results.
12. 
：Earthing terminal serves as enclosure earthing of whole machine, which belongs to protective earthing.
13. RS485: Standard 485 communication interface.
14. Interface of U disc: use to export temperature rise data record, and connect the machine to generate the temperature rise curve.
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