MOEORW- W4620A2 20A DC Resistance Tester
Product Introduction
MOEORW‑W4620A2 is an intelligent dedicated testing device designed for measuring the DC resistance of transformers, positioned as a high-precision professional instrument in the power detection field. Equipped with a high-speed microprocessing unit, the whole machine achieves stable output of large current, accurate measurement of wide range, full-scenario protection and convenient operation relying on new power supply technology, which can efficiently complete the DC resistance detection tasks in transformer production, installation and maintenance as well as preventive tests in the power industry.
The DC resistance of transformer windings is a mandatory test item for factory inspection, installation and commissioning, tap changer modification and preventive tests. It can accurately determine the welding quality of winding joints, inter-turn short-circuit hazards, the contact and conduction status of each gear of the tap changer, the integrity of leads and the broken strand problem of multi-strand wires. To solve the problem of rapid measurement of DC resistance of large-capacity transformers, this product integrates high-speed single-chip microcomputer control, automatic discharge, discharge alarm and other functions, with the advantages of small size, good repeatability, strong anti-interference and perfect protection, greatly improving the efficiency and safety of on-site detection.
Product Parameter (specification)
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Project |
Technical specifications and parameters |
Remark |
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Test current |
<20mA, 1A, 2.5A, 5A, 10A, 20A |
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Measurement range |
100μΩ～1Ω (20A) 500μΩ～2Ω (10A) 1mΩ ～4Ω ( 5A) 2mΩ ～8Ω (2.5A) 5mΩ ~ 20Ω (1A) |
Accuracy: ±(0.2% + 2 characters) |
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10Ω-20KΩ (<20mA) |
Accuracy: ±(0.5% + 2 characters) |
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minimum resolution |
0.1μΩ |
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show |
LCD monitor |
The resistance display has 4 significant digits. |
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Data storage |
1000 sets |
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Work environment |
Ambient temperature: 0℃～40℃; Relative humidity: <90%RH, non-condensing. |
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power supply |
AC 220V±10V, 50Hz±1Hz |
Fuse 5A |
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Maximum power consumption |
500W |
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External dimensions |
400×225×350 (mm) |
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Weight |
Main unit 15.1KG, cable box: 5.75KG |
Product features and applications
- Full automatic control by high-speed single-chip microcomputer, simple human-computer interaction, and one-key completion of the detection process.
- Innovative power supply scheme combined with multi-range current output, wide measurement coverage, suitable for DC resistance detection of large and medium-sized transformers.
- Perfect back EMF protection system, effectively resisting the reverse impact of inductive loads, making the equipment run more stably.
- Acoustic and optical discharge alarm + clear discharge indication, reducing the safety risk of misoperation.
- Intelligent power consumption control, maintaining the lowest energy consumption operation, saving energy and reducing heat generation.
- 7-inch high-brightness touch color screen, visible in strong light, full touch operation, supporting free switching between Chinese and English.
- Built-in perpetual calendar clock and power-off protection, can store 1000 sets of data, which can be retrieved and viewed at any time.
- Equipped with RS232 and USB interfaces, supporting computer communication and U-disk data export.
- Panel-mounted micro printer, which can directly print English test reports.
- Support remote control by Android mobile phone/tablet, follow the official WeChat account to download the dedicated APP to realize full-process control, data storage and upload.
Prodection details
Transformer manufacturing
Factory inspection of semi-finished/finished products, troubleshooting process defects such as winding welding and inter-turn short circuits.
Installation and maintenance acceptance
After new installation, major maintenance and tap changer modification, verify the gear contact accuracy and lead integrity.
Power preventive test
Regularly detect the DC resistance of in-service transformers to ensure the safe and stable operation of equipment.
Company Qualifications
Q: Why does the MOEORW‑W4620A2 20A Transformer DC Resistance Tester have unstable measurement results?
The main reasons for unstable measurement results are poor contact of test wires, insufficient discharge of the tested transformer, or electromagnetic interference. You can check whether the test wire connector is loose or oxidized, fully discharge the tested transformer before measurement, ensure the instrument is well grounded, and keep it away from strong electromagnetic interference sources such as frequency converters and high-power motors. If the problem persists, it is recommended to check whether the instrument needs calibration.
Q: What should I do if the MOEORW‑W4620A2 20A Transformer DC Resistance Tester fails to output test current?
First, check whether the test wires are disconnected or poorly connected, and confirm that the tested transformer circuit is turned on. If the instrument has been working for a long time, it may trigger overheating protection; you can turn off the instrument and restart it after cooling. If the problem cannot be solved, it may be a fault in the internal power module of the instrument, and you need to contact us for after-sales maintenance.
Q: Can the MOEORW‑W4620A2 20A Transformer DC Resistance Tester be used to measure the DC resistance of small transformers?
Yes. The instrument has multiple current ranges from <20mA to 20A, and the measurement range covers 100μΩ～20KΩ. It can be used to measure small transformers by selecting the appropriate current range (such as <20mA or 1A), and the measurement accuracy can reach ±(0.2%+2 digits) in the corresponding range.
Q: How to calibrate the MOEORW‑W4620A2 20A Transformer DC Resistance Tester to ensure measurement accuracy?
It is recommended to send the instrument to a professional metrology institution for periodic verification and calibration. Daily use can also be calibrated by the following methods: perform open-circuit zero calibration and short-circuit zeroing operation according to the instrument manual, select the appropriate test current range, and ensure that the four-wire (Kelvin) wiring method is used to avoid lead resistance affecting the measurement results.
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