Winding Resistance Tester
Our Winding Resistance Tester is designed to measure the DC resistance of three-phase windings in large-capacity transformers. It primarily tests the DC resistance of transformer windings, motor windings, and other electrical components.
For on-load tap changers (OLTCs), the test can be performed without discharge, allowing the tap changer to be directly adjusted. Compared to traditional single-phase measurement, this method reduces measurement time to one-third, significantly improving efficiency and reducing labor intensity.
It helps identify issues such as open circuits, loose connections, short circuits between turns, and winding degradation.
Why Choose Us?
Our company has been specializing in the production and manufacturing of frequency series resonance devices for 21 years, with a modern intelligent factory covering over 40,000 square meters and more than 100 automated production, manufacturing, assembly, and testing equipment. We have obtained CE certification and currently serve over 20,000 customers worldwide.
Quotation within 1 hour – Solution within 24 hours - Product demonstration available - Strict contract performance
On-time delivery - 12-month warranty – Optional extended warranty - Factory acceptance testing
Authorized calibration (optional) - Worldwide training support – Regular follow-up visits
Product Features
1.Simultaneous Three-Phase Measurement
2.Measures the DC resistance of all three-phase windings simultaneously, improving efficiency.
3.Discharge-Free Tap Changer Testing
4.Allows direct adjustment of on-load tap changers (OLTCs) without the need for discharge, reducing test time.
5.Cuts measurement time to one-third of traditional single-phase testing.
6.User-Friendly Interface
7.Features a large LCD screen with a fully graphical Chinese interface, ensuring clarity and ease of operation.
8.Data Storage & Printing
9.Equipped with a built-in printer and large-capacity non-volatile memory for convenient data storage and printing.
10.Fast, Stable, and Repeatable Testing
11.Provides high stability and repeatability, making it the ideal choice for on-site transformer DC resistance measurement.
21 years professional manufacturer and supplier in china, standardized factory, best product quality, and cheap wholesale prices！！！
Why is Winding Resistance Testing Important?
1. Ensures Transformer Health
Detects winding degradation before major failures occur.
Identifies poor electrical connections that may cause overheating.
2. Detects Manufacturing Defects
Verifies the quality of transformer windings before deployment.
Ensures compliance with IEC, IEEE, and ANSI standards.
3. Prevents Unexpected Shutdowns
Supports predictive maintenance, preventing costly failures.
Reduces maintenance costs by identifying faults early.
4. Evaluates Tap Changer Performance
Ensures smooth operation of on-load tap changers (OLTCs).
Detects contact wear, misalignment, or mechanical defects.
Working Principle of Winding Resistance Tester
The tester injects a precise DC current into the winding and measures the voltage drop, using Ohm's Law (R = V/I) to calculate resistance.
Step-by-Step Workflow
Current Injection
The tester applies a low DC current to the transformer or motor winding.
Voltage Measurement
Measures the voltage drop across the winding terminals.
Resistance Calculation
Uses Ohm’s Law to calculate and display the resistance value.
Temperature Compensation (Optional)
Some advanced testers adjust the resistance value to a standard reference temperature (e.g., 75°C or 20°C).
Demagnetization (If Necessary)
Ensures that the transformer core returns to a neutral magnetic state after testing.
Applications of Winding Resistance Tester
1. Power Transformers
Factory Testing – Verify the resistance of newly manufactured transformer windings.
Substation Maintenance – Diagnose aging, short circuits, or loose connections.
Tap Changer Testing – Identify contact resistance issues in OLTC and DETC.
2. Motors & Generators
Industrial Motors – Prevent overheating by detecting unbalanced windings.
Hydroelectric & Thermal Generators – Ensure consistent performance by testing winding integrity.
3. Power Transmission & Distribution Equipment
High-Voltage Circuit Breakers – Test the resistance of high-voltage contacts.
Busbars & Cables – Verify the continuity and connection quality in electrical networks.
4. Renewable Energy Systems
Wind Power Transformers – Detect faults caused by mechanical stress and vibration.
Solar Inverter Transformers – Ensure stable operation under fluctuating loads.
21 years professional manufacturer and supplier in china, standardized factory, best product quality, and cheap wholesale prices！！！
As one of the leading winding resistance tester manufacturers and suppliers in China, we warmly welcome you to buy high-grade winding resistance tester made in China here from our factory. For price consultation, contact us.