Your Professional Transformer Turns Ratio Tester Supplier
Founded in 1992 and formally incorporated as Wuhan Moen Intelligent Electrical Co., Ltd. on November 12, 2012, with a registered capital of RMB 36 million, we are a professional technology company specializing in the research, development, and production of high-voltage test equipment. Our 8,000 m² facility in Wuhan East Lake High-Tech Development Zone houses dedicated production lines, R&D centers, and administrative facilities. With an experienced technical and production team, Moen focuses on core products including test transformers, series resonance systems, and other high-voltage testing equipment. Backed by years of industry experience, the company is committed to reliable manufacturing, continuous technical improvement, and providing practical solutions for global power utility and industrial customers.
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![Handheld Transformer Turns Ratio Group Tester]()
Handheld Transformer Turns Ratio Group TesterThis handheld transformer turns ratio tester is ultra lightweight, compact, and extremely practical for on site work. It supports one time wiring to finish turns ratio, group, polarity, angle -
![Handheld Turns Ratio Group Tester]()
Handheld Turns Ratio Group TesterThis handheld model is lightweight, durable, and waterproof, perfect for field and outdoor work. It supports three-phase simultaneous measurement and automatic group identification, saving time and -
![Automatic Transformer Turns Ratio Group Tester]()
Automatic Transformer Turns Ratio Group TesterThis benchtop tester is highly practical and easy to operate. It supports one-time wiring to complete turns ratio, group, polarity, and angle difference testing. It has built-in printing, USB -
![Transformer DC Resistance And Turns Ratio Integrated Tester]()
Transformer DC Resistance And Turns Ratio Integrated TesterOne-time wiring completes six-phase tests, doubling your efficiency. Supports temperature conversion and automatic connection group recognition, suitable for special transformers. Multiple safety -
![Transformer DC Resistance & Ratio Tester]()
Transformer DC Resistance & Ratio TesterAll-in-one design integrates DC resistance and transformation ratio tests, saving wiring time and labor. 7-inch touchscreen makes operation simple and fast. Built-in print, storage and USB export -
![Transformer Turns Ratio Verification Device]()
Transformer Turns Ratio Verification DeviceThe MOEORW-WBC91 Transformer Turns Ratio Verification Device is designed for power calibration agencies and power users, and is a high-precision transformer turns ratio verification device.It focuses -
![Three Phase Transformer Turns Ratio Tester]()
Three Phase Transformer Turns Ratio TesterThe MOEORW-W4506 is a three-phase transformer turns ratio group tester designed for power companies, transformer manufacturers, and maintenance personnel .It features fully automatic measurement, -
![Instrument Transformer Winding Deformation Tester]()
Instrument Transformer Winding Deformation TesterThe MERB-WII Transformer Winding Deformation Tester employs the FRA method, accommodates transformers ranging from 63kV to 500kV, supports multiple connection types for measurement, delivers precise -
![Special Transformer Turns Ratio Tester]()
Special Transformer Turns Ratio TesterMEBC-WYT2 Handheld Specialized Transformer Ratio and Group Tester supports full blind testing and multiple transformer types. It delivers precise and reliable three-phase true measurement and phase -
![Fully Automatic Transformer Ratio Tester]()
Fully Automatic Transformer Ratio TesterThe MEBC-WE Fully Automatic Turns Ratio and Connection Group Tester employs a lithium battery along with an adaptive 220V AC power supply. With a large screen of high definition and a thermal -
![Transformer Turns Ratio Group Tester]()
Transformer Turns Ratio Group TesterMEBC-WII Fully Automatic Turns Ratio and Tap Position Tester is specifically designed for the power industry to address the pain points of traditional measurement methods. It automatically completes -
![Transformer Turn Ratio Meter]()
Transformer Turn Ratio MeterEssential for transformer production, commissioning, and maintenance! The MEBC-WZ Handheld Turns Ratio and Group Tester supports single-phase/three-phase testing with easy storage and export.
Why choose us
Our Certificate
We are certified in ISO 9001 (Quality), ISO 45001 (Health & Safety), and ISO 14001 (Environment), ensuring high standards in all aspects of our operations.
Strong R&D Capability
Committed to technological breakthroughs, including investments to develop 750kV reactor solutions.
Experienced Technical Team
A growing team of 61 employees supporting product development, production, and customer service.
Complete Pre & After-Sales Service
From solution design and technical support to installation, maintenance, and fast response service.
A Transformer Turn Ratio (TTR) tester is an essential diagnostic tool used to verify the performance and integrity of transformers by measuring the ratio of turns between primary and secondary windings. This measurement ensures that the transformer is operating within its designed specifications, helping to prevent inefficiencies, faults, or failures in power systems. TTR testers come in various types, each suited to different environments, testing needs, and operational demands—from field inspections to large-scale industrial applications.
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Turns ratio measurement range |
0.9 to 10000 |
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Measurement speed |
Completes three-phase testing within 35 seconds |
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Measurement accuracy |
High-voltage side voltage measurement accuracy;0.05% Low-voltage side voltage measurement accuracy;0.1% Phase angle resolution;0.01° Phase angle measurement accuracy;0.1° Transformation ratio resolution;0.0001 Transformation ratio measurement accuracy;0.1% (0.9–200);0.2% (200–2000);0.3% (2000–10000) Customizable full-range 0.1-class devices available upon request |
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Output voltage |
AC 25V for standard transformers, AC 5V for low-input transformers |
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Portable design suitable for field operations |
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Dimensions |
260 × 160 × 60 mm |
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Weight |
1.8 kg |
Features of Special Transformer Turns Ratio Tester
Test Voltage
Transformer turns ratio testers are designed with adjustable or fixed test voltage outputs, typically ranging from a few volts up to several hundred volts, depending on the model. This flexibility allows technicians to safely test a wide variety of transformers—from low-voltage distribution units to high-voltage transmission-class equipment.
Accuracy and Resolution
Precision is paramount in transformer testing. Most professional-grade turns ratio testers offer an accuracy of ±0.1% to ±1%, with high-end models achieving even tighter tolerances. This level of accuracy ensures early detection of winding deformations, shorted turns, or incorrect tap changer settings.
Measurement Range
The measurement range defines the spectrum of turns ratios a tester can accurately evaluate. Entry-level devices may cover ratios from 1:1 to 100:1, while industrial models can extend beyond 10,000:1, accommodating multi-winding and auto-transformer configurations.
Data Logging and Display
Digital displays provide real-time, easy-to-read measurements, often with backlit screens for visibility in low-light conditions. Advanced testers feature graphical interfaces that display trends, pass/fail indicators, and historical data.
Safety Features
Given the high-energy environments in which these testers operate, built-in safety mechanisms are crucial. Common protections include overvoltage shutdown, current limiting, grounding detection, and insulation resistance monitoring (typically rated at 2 kV or higher).
Portability and Power Options
Field technicians benefit greatly from compact, lightweight designs that facilitate transportation between sites. Many modern testers weigh less than 5 kg and come with rugged carrying cases for durability.
Types of Special Transformer Turns Ratio Tester
Analog Testers
Traditional instruments using analog meters to display the turns ratio. Ideal for basic diagnostics and quick field checks.
Digital Testers
Advanced testers with digital readouts offering high precision and enhanced functionality for accurate ratio analysis.
Portable Testers
Compact, rugged units designed for on-site testing in remote or challenging environments such as substations and power plants.
Handheld Devices
Ultra-compact testers that fit in a toolbox or pocket, enabling rapid checks on small to medium transformers.
High-Voltage Ratio Testers
Specialized equipment designed for large power transformers operating at transmission-level voltages (69 kV and above).
Automatic Testers
Smart systems that automate test voltage selection, measurement, and calculation to reduce human error and improve efficiency.
Applications of Special Transformer Turns Ratio Tester
Power Utilities
Electric power utilities rely heavily on TTR testers to monitor the health of transmission and distribution transformers. These transformers are essential for stepping voltage up or down across the grid, and even minor deviations in turn ratio can indicate insulation degradation, winding displacement, or manufacturing defects.
Industrial Facilities
In industrial environments—Such as manufacturing plants, refineries, and chemical processing units—Large power transformers support heavy machinery and production lines. Downtime due to electrical failure can result in significant financial losses and safety hazards.
Commercial Buildings
Office complexes, shopping malls, hospitals, and data centers depend on reliable electrical systems to operate elevators, HVAC, lighting, and IT infrastructure. Transformers in these buildings are subject to continuous load cycles, thermal stress, and environmental factors that can degrade performance over time.
Renewable Energy Systems
With the rapid growth of solar farms and wind power plants, TTR testers play a vital role in integrating renewable energy into the grid. These facilities use step-up transformers to convert generated low-voltage power to high-voltage levels suitable for transmission.
Military and Defense Installations
Military bases, command centers, and field operations require uninterrupted and secure power supplies. Transformers in defense applications often operate under extreme conditions, including high loads, environmental exposure, and electromagnetic interference.
Transportation and Rail Systems
While not originally listed, it's worth noting that rail networks and transit systems also benefit from TTR testing. Electrified railways use specialized transformers to supply power to overhead lines or third rails. Any deviation in turn ratio can affect train performance, signaling systems, or safety mechanisms.
Prepare the Instrument
Verify battery charge level before deployment. Review the user manual for model-specific settings and safety warnings. Ensure all test leads are securely stored and undamaged.
Select Transformer Parameters
Identify the transformer nameplate data, including rated voltage, kVA, and expected turn ratio. Input these values into the tester if required for comparative analysis.
Connect Test Leads
Attach the high-voltage (HV) lead to the primary winding terminal and the low-voltage (LV) lead to the secondary winding. Use color-coded connectors to avoid miswiring. Ensure connections are clean and tight to prevent arcing.
Power On and Initiate Test
Turn on the device and select the appropriate test mode (single-phase or three-phase). Press the "Test" button to begin measurement. The unit applies a low-voltage AC signal and calculates the ratio automatically.
Record and Analyze Results
Read the digital display showing the measured turn ratio, percentage deviation from expected value, and
Maintenance And Calibration Best Practices
After each use, wipe the casing with a soft, dry microfiber cloth. Avoid solvents or water that could damage seals or penetrate the enclosure. Clean test lead connectors with contact cleaner to maintain conductivity.
Recharge batteries after each day of use. Store the unit with at least 50% charge if not in use for extended periods. Replace aging batteries every 2–3 years to prevent voltage instability.
Check the manufacturer’s website quarterly for firmware updates. These often include improved algorithms, enhanced diagnostics, and expanded language support. Update via USB connection following secure protocols.
Inspect leads monthly for cuts, exposed wires, or bent pins. Perform continuity and resistance checks using a multimeter. Replace damaged leads immediately—faulty cables are the most common cause of inaccurate readings.
Calibrate annually or after any physical impact. Use an accredited calibration lab that provides traceable certification (NIST or ISO 17025). Document all calibration dates and results for audit purposes.
Certificates
FAQ
As one of the most professional transformer turns ratio tester manufacturers in China, we're featured by quality products and good price. Please rest assured to buy high quality transformer turns ratio tester in stock here and get quotation from our factory. Customized orders are welcome.
Transformer Turn Ratio Meter, Transformer Winding Deformation Tester, Transformer On load Switch Tester
