Transformer Winding Resistance Meter : XWRM-25A

Our advanced transformer winding resistance meter, XWRM-25A, is used to test the winding resistance of high voltage transformers. This transformer winding resistance equipment has a higher open-circuit voltage feature that quickly saturates the core, resulting in consistent readings. Our transformer winding tester has test current range of 25A, 10A, 5A, 1A, 100mA & 10mA.

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    XWRM-25A. transformer winding resistance meter is designed for accurate & fast measurement of the highly inductive loads such as transformers, reactors, generators, HT motors, etc. The selectable smooth DC test current is useful to test transformers with different power ratings. The higher open-circuit voltage feature saturates the core quickly to get stable readings. The three resistance measurement channels are used for the simultaneous measurement of the three windings to reduce the testing time. The heat run test feature can be availed with the software for a graphical representation. It also has a demagnetization facility, which eliminates the magnetic remanence effect. XWRM-25A can test the make-before-break operation of on-load tap-changers which can help you analyze the OLTC switch contracts. Backed with EMF protection against high inductive kickbacks, the large LCD with a keypad helps in easy operations.

    It also has an internal memory for 2000 test results. The software is designed for detailed report generation and control. The in-built thermal printer provides onsite report printing.

    Ask for a quote to know our transformer winding resistance meter price.

    XWRM-25A has a Bluetooth module with MOT-WARE mobile app for remote access of the testing data & storage in the cloud for further analysis & record purposes.


    • Test currents of 25A, 10A, 5A, 1A, 100mA & 10mA 
    • Resolution of 0.1μΩ with ± 0.1% accuracy
    • 3 independent channels for resistance measuring
    • Auto range facility
    • Heat run test facility
    • 60V high open circuit voltage for stable readings
    • Demagnetization facility
    • OLTC dynamic resistance test with a graph: Time vs Current
    • Inbuilt thermal printer & memory
    • Bluetooth enabled for MOT-WARE mobile app
    • Heat Run Test
    • OLTC Dynamic Test 


    The winding resistance test is an essential test that enables the identification of shorted turns, loose connections, or deteriorating contacts in tap changers and measurements on all tap changer positions. The transformer’s conditions can be compared to previous or factory test values for evaluating the condition of the current windings and leads. The accepted criteria for the field-measured values should be within 3% of the factory values. A change higher than the accepted criteria is indicative of short-circuited turns, poor joints, or bad tap changer contacts. This test should be performed during acceptance testing and can also be performed while other maintenance electrical tests are conducted.

    • Power Transformer 
    • Motor and Generator
    • Reactor

    Power Supply: 115/230VAC, 50/60 Hz 

    Test Current:

    25A, 10A, 5A, 1A, 100mA & 10mA
    Open-Circuit Test Voltage: 60 VDC 
    Burden: 1500W 

    Resistance Measurement Range 

    Accuracy: ±(0.1% of rdg. ± 5counts) 

    Test Current Range (Ω) Resolution (Ω) Maximum Display (Ω)
    25A 10A 1A 100mA 10mA
    200uΩ 0.01uΩ 199.99uΩ
    2mΩ 0.1uΩ 1.9999mΩ
    20mΩ   1uΩ 19.999mΩ
    200mΩ 10uΩ 199.99mΩ
    0.1mΩ 1.9999Ω
    20Ω 1mΩ 19.999Ω
    200Ω 10mΩ 199.99Ω
    2000Ω 0.1Ω 1999.9 Ω


    Test Current Range (Ω) Resolution (Ω) Maximum Display (Ω)
    5A 4 mΩ 0.1 µΩ 4.0000 mΩ
    40 mΩ 1 µΩ 40.000 mΩ
    400 mΩ 10 µΩ 400.00 mΩ
    4 Ω 0.1mΩ 4.0000 Ω


    Principle: 4 wire measurement 
    Measurement Channel: 3 resistance & 1 current channel
    Temperature Channel: 2 Channel 
    Temperature Range: 0 – 100 °C 
    Display: LCD 
    Indication: LED & veep during test on, & discharge
    PC Interface: USB 
    Internal memory: 2000 test readings 
    Printer: Inbuilt thermal printer 

    Safety & Standards 

    Ingress Protection: IP 54 
    CE Certification 
    Safety: Compliant with IEC 61010-1 
    EMC: Compliant with IEC 61326-1


    Conditions Operating Temperature: 0°C to 55°C 
    Storage Temperature: -10°C to 60°C 
    Humidity: 95% RH, Non condensing

    Physical Specifications 

    Dimensions (L×W×D) mm: 525 x 437 x 213 
    Weight: 15 kg 

    Software Details 

    Type: Windows based analytical software 
    Data Transfer: Real-time data transfer 

    Features: Online data acquisition 
        Graph plotting for heat run test & OLTC dynamic test 
        Remote operation 
        Test report generation 

    Standard Accessories 

    15 meters measuring test lead set 
    Mains power cord 
    Short links – 2Nos. 
    Earthing lead 
    User manual 
    Calibration certificate 
    Carry case for test leads 

    Optional Accessories

    OLTC probe
    PC Software 
    USB cord 
    Temperature sensor 
    Bluetooth application via cloud based Motware application

    Motware Cloud Application

    Motwane has designed and developed MOT-WARE – a cloud-based Test Data platform to aid in accurate Asset Health Assessment. Through Motware, the Test and Measurement industry has taken a huge leap forward. It is a revolution in the way tests are conducted and the way data is analyzed. 

    MOT-WARE captures data from a full range of BLE Enabled Motwane Testing Equipment. It is accessible from web based applications, desktop applications, and mobile applications. In addition, it offers an open architecture that can seamlessly integrate with any non Motwane Test and Measurement equipment for quick and authentic digital test data. Data can be captured periodically as well as be streamed in real-time via sensors from IoX’n Series of IoT devices. (link to Ioxn page)

    Some of its features include a pre-loaded repository of test templates for various assets as well as customizable test templates. A customized report builder in MOT-WARE allows users to create reports that can be designed and generated as per their desire. MOT-WARE also has a facility to upload test data history and the breakdown history of the assets. Tests can also be viewed in various metrics such as Pass/Fail.

    Digital test data enables data analytics and visualization which offers multiple statistical advantages. It improves productivity & efficiency, enables cost reduction, and improves asset life. Data analysis done through MOT-WARE includes trend analysis, MIS reports, and pivot tables. As an add-on, MOT-WARE also offers ‘Motwane AI Analytics’(Link to AI Analytics page)  which uses a proprietary AI algorithm and Machine Learning to make accurate predictions about your asset’s life based on its behavioral patterns and operating conditions.

    MOT-WARE can be used for various applications across customer segments like Utilities, OEMs, Industries, Electrical contractors (Testing, O&M) or Field repairs & service providers, EPCs, commercial premises, and many more. 

    Join the latest innovation in Electrical Testing by using Motware on your Test and Measurement equipment.

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    Additional VP Protection BSES Rajdhani Power Ltd.

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