Product Introduction
The 3 Phase DC Winding Resistance Tester is an intelligent device specifically designed to measure the DC resistance of the three-phase winding of large capacity transformers. For on load tap changers, discharge is not required and the tap changers can be adjusted directly. The measurement time is one-third of traditional single-phase measurement, which can greatly reduce working time and labor intensity. The test data is stable, fast, and has good repeatability, making it the best choice for on-site measurement of transformer DC resistance.
Technical Parameters
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Testing current |
Single phase: 1A 5A 10A 20A |
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Three phase: 1A 5A 10A |
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Measurement scope |
Single phase |
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1A 10mΩ~20Ω |
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5A 1mΩ~4Ω |
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10A 1mΩ~2Ω |
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20A 1mΩ~1Ω |
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Three phase |
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1A 10mΩ~6Ω (each phase) |
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5A 1mΩ~1Ω (each phase) |
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10A 1mΩ~0.6Ω (each phase) |
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Measurement accuracy |
±(0.2%Full span±2 words) |
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Maximum resolution |
0.1μΩ |
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Data storage capacity |
150 groups |
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Power supply |
AC 220V±22V,50Hz±2Hz |
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Working environment |
Ambient temperature: 0°~40°; Relative humidity :≤80% |
Product Features
1. The DC resistance of the three-phase winding of the transformer can be tested simultaneously.
2. On load voltage regulating transformers can be directly adjusted without discharge, and the measurement time is one-third of traditional single-phase measurement, which can greatly reduce working time and labor intensity.
3. The 3 phase DC winding resistance tester adopts a large screen LCD display with a fully Chinese graphical interface, which is clear and intuitive, and the operation is very simple.
4. Equipped with a panel printer and large capacity non-volatile memory, you can easily store and print measurement results.
5. The test data is stable, fast, and has good repeatability, making it the best choice for on-site measurement of transformer DC resistance.
Product Advantages of 3 phase DC winding resistance tester
1. Greatly Improves Testing Efficiency
3 phase DC winding resistance tester tests all three-phase windings simultaneously, instead of testing one phase at a time. This reduces test time by up to 70%, especially for large power transformers with long stabilization delays.
2. Enhances Data Accuracy & Comparability
Simultaneous measurement eliminates time-related errors between phases. The three-phase unbalance rate is calculated directly from data taken under identical conditions, making it far more reliable for detecting loose connections or shorted turns.
3. Effectively Solves the Residual Magnetism Problem
Built-in automatic demagnetization circuits eliminate residual magnetism after each test. This protects the transformer from inrush currents during re-energization and improves the safety of both personnel and equipment.
4. Increases Test Safety
Advanced discharge circuits safely release stored magnetic energy after each test. Operators receive clear "discharge complete" indications before disconnecting leads, preventing dangerous arcing or electric shock.
5. Ideal for High-Volume Testing Environments
For power companies, maintenance contractors, testing laboratories, research institutions, and transformer manufacturers that perform frequent or large-scale testing, this tester significantly boosts workflow efficiency while ensuring consistent, reliable results.
6. Key Selection Criteria
When choosing a model, pay attention to:
- Current output capability (matches transformer size)
- Measurement accuracy (typically ±0.2%)
- Demagnetization effect (automatic vs. manual)
- Ease of operation (one-key testing, clear display)
- Compatibility with the specific transformer types you test
Application of Three Phase DC Winding Resistance Tester
1. Power Utilities & Substations - Commissioning, maintenance, and post-fault testing of power transformers.
2. Transformer Manufacturers - Final quality control and factory acceptance testing.
3. Maintenance Contractors - Fast on-site testing for multiple transformers daily.
4. Testing Labs & Research Institutions - Failure analysis and type testing requiring high accuracy.
5. Wind Farms & Renewable Sites - Testing pad-mounted and collector transformers in remote locations.
6. Industrial Plants (Steel, Mining, Chemical) - Scheduled maintenance of critical production transformers.
7. Railway & Traction Systems - Testing transformers for electric trains and signaling equipment.
8. Post-Fault Emergency Assessment - Rapid damage evaluation after short circuits or lightning strikes.
9. New Substation Commissioning - Site acceptance testing before commercial operation.
10. Aging Transformer Monitoring - Periodic checks to track winding condition over time.
Transportation and Storage
Transportation
When transporting the 3 phase DC winding resistance tester, it is suggested using the instrument packing wood boxes and damping materials of our company to avoid any unnecessary damage and loss during the transportation.
Do not stack the 3 phase DC winding resistance tester if it is not transported in a wood box. If the instrument packing box of our company is used, the maximum permissible stacking layers are two layers.
The equipment shall be transported with the instrument panel facing upward.
Storage
The 3 phase DC winding resistance tester shall be stored in the dry, dust-free and well-ventilated room without corrosive gas. Do not stack the equipment if it is not packed in the wood box.
The 3 phase DC winding resistance tester shall be stored with its panel facing upward. Besides, damproof materials shall be provided at its bottom to protect it from dampness.
After-sales Service
The warranty period for the whole set of this 3 phase DC winding resistance tester is one year and "Three-guarantees"(repair, return and exchange guarantees) is implemented. Maintenance service can be provided throughout its service life. For any quality problem of the equipment within the warranty period, free maintenance will be provided. For the damages due to the improper operation or carelessness of the user, services will be provided at favorable prices.
We are looking forward to your precious suggestions about our product. If the address and contact information of your company are changed, please keep us informed so that we can serve you in good time.
Why choose us?
When you contact us, you will receive a quotation in under one hour and a practical solution within 24 hours. We are also happy to arrange a product demo so you can see our testers in action before making a decision. Once you commit, we honor the contract strictly, keep you informed of production progress, and deliver on time. Our export experience spans nearly 100 countries-from Malaysia and Indonesia to the United States, Australia, Saudi Arabia, and Brazil-so we know how to handle international orders smoothly. Behind our success is a clean, well-equipped production environment and an organized office space where our R&D and QC professionals work diligently to ensure every unit passes factory acceptance testing. After your equipment arrives, we continue to support you: responses within six hours, a full 12-month warranty, overseas training for your team, regular return visits, and optional extended warranty and rental services. Need a customized solution? We can do that. Need authorized calibration? We offer that as an option too. And we do all of this at very competitive prices-because we want you to stay with us for the long term.
FAQ
Q: What is a 3 Phase DC Winding Resistance Tester used for?
A: It is used to measure the resistance of transformer windings, motor windings, generator field windings, and other inductive coils. The test detects loose connections, broken strands, poor crimping, tap changer contact wear, and phase imbalance.
Q: Why measure DC resistance instead of AC resistance?
A: DC resistance eliminates the effects of inductance and core saturation, providing a pure measurement of the conductor's physical resistance. This reveals actual connection quality and conductor condition, which AC methods cannot due to inductive reactance interference.
Q: Is it safe to disconnect the 3 phase DC winding resistance tester immediately after testing?
A: No. Transformer windings store significant magnetic energy. The tester includes a built-in discharge circuit that automatically discharges the winding after each test. Wait for the "Discharge Complete" indicator (typically 5-30 seconds) before disconnecting leads to avoid dangerous arcing or shock.
Q: Is the 3 phase DC winding resistance tester portable for field use?
A: Yes, typical units weigh between 3 to 10 kg, are battery-powered or operate from standard 220V/110V outlets, and come in rugged carrying cases. Some models include built-in rechargeable batteries for use in substations or remote sites without external power.
Q: Are you a factory or just a trading company?
A: Wuhan UHV Power Technology CO.,Ltd. is an industrial and trade enterprise, with its own factory, self-produced and self-sold.which means you get factory-direct pricing and direct technical support without any middlemen. You are welcome to request a factory tour via video call or visit us in person to verify our production capabilities.
We are a professional 3 phase DC winding resistance tester manufacturers in China.We can provide the best professional 3 phase DC winding resistance tester for sales and competitive price. If you are looking for 3 phase DC winding resistance tester supplier, we are a good choice.
Contact us to get 3 phase DC winding resistance test set price.
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