• lizhvtesttech@gmail.com
  • +1 323 522 4623
Transformer Turns Ratio (TTR) Testers

Transformer Turns Ratio (TTR) Testers

Our Transformer Turns Ratio (TTR) Testers are designed to provide accurate and efficient measurement of the turns ratio in transformers. Essential for verifying the integrity and performance of transformer windings, these testers help ensure the reliability and safety of electrical power systems.

lizhvtesttech@gmail.com

+1 323 522 4623

Main menu interface

3-phase transformer turns ratio test

Key Features:

  • Single Power Input: Equipped with an internal digital combination standard sine wave test source for efficient power output.
  • Phase Angle Measurement: Accurately measures the phase angle between the high and low voltage sides, including turn ratio and angle of “Non-integral point” transformers.
  • Comprehensive Testing: Capable of single-phase and three-phase winding automatic tests, measuring three-phase turn ratio values, phase angles, errors, tapping positions, and values in one operation, with automatic identification of the connecting group number.
  • Clear Result Display: Test results are shown in both digital format and hexagon vector diagrams, providing clear visualization of the transformer connecting group.
  • Blind Test Functionality: Automatically adjusts connecting methods for Y/△ and △/Y transformers without the need for external short-circuits, based on the selected testing content.
  • Tapping Test Function: Quickly gauges TTR and TTR error at each tapping switch position. Once the rated TTR is input, the TTR error for each tapping position is calculated automatically.
  • Versatile Measurement Functions: Includes both turns ratio measurement and voltage TTR measurement capabilities.
  • 5.6-Inch LCD Display: Features a large, clear LCD screen for easy data and figure visualization.
  • Portable Design: Compact and lightweight, making it easy to carry and transport.
  • Rechargeable Lithium Battery: Built-in high-capacity battery allows for on-site testing without external power. When fully charged, it can perform more than 500 continuous measurements.

Applications:

  • Power Transformers: Verifying the winding turns ratio and identifying any discrepancies in power transformers.
  • Distribution Transformers: Ensuring the accuracy and performance of distribution transformers.
  • Instrument Transformers: Testing the turns ratio in instrument transformers to maintain their accuracy.
  • Special Transformers: Suitable for testing special-purpose transformers such as rectifier transformers, furnace transformers, and more.

Product Range:

  1. Portable TTR Testers:
    • Designed for on-site testing with a compact and portable form factor.
    • Ideal for quick diagnostics and field maintenance tasks.
  2. Laboratory TTR Testers:
    • Suitable for detailed analysis in laboratory settings.
    • Offers comprehensive testing capabilities for thorough quality assessment.
  3. Automated TTR Testers:
    • Features automated testing procedures to enhance efficiency and accuracy.
    • Perfect for high-volume testing environments where precision is crucial.
  4. Custom Solutions:
    • Tailored TTR testers to meet specific customer requirements and testing scenarios.

Technical Specifications:

Specifications:
  • Ratio Measurement Range: 0.8 to 10000
  • Measuring Speed: Completes three-phase test in 1 minute
  • Measuring Accuracy:
    • HV Voltage Accuracy: 0.05%
    • LV Voltage Accuracy: 0.1%
    • Phase Angle Accuracy: 0.1°
    • Ratio Accuracy:
      • 0.1% (0.8 to 3000)
      • 0.2% (3000 to 10000)
  • Weight: 3kg
  • Power Supply: 220V ± 10%, 50Hz ± 1Hz
  • Operating Temperature: -20℃ to 40℃
  • Relative Humidity: ≤85%, non-condensing
Features:
  1. Single Power Input: Digital sine wave output from a single power source.
  2. Phase Angle Measurement: Measures phase angle, turn ratio, and angle for “Non-integral point” transformers.
  3. Auto Testing: Measures three-phase TTR, phase angle, error, tapping position, and group detection in one test.
  4. Clear Display: Results shown as digits and hexagon vector diagrams for easy group identification.
  5. Blind Test: Automatically adjusts connections for Y/△ and △/Y transformers without external short circuits.
  6. Tapping Test: Measures TTR and errors for all tap positions after inputting rated TTR once.
  7. TTR & Voltage Measurement: Measures both turns ratio and voltage TTR.
  8. LCD Display: 5.6-inch screen for clear data visualization.
  9. Portable: Compact and lightweight for easy transport.
  10. Long Battery Life: Built-in rechargeable lithium battery for 500+ tests per charge.
Specifications:
  • Test range：0.9～10000
  • Measurement accuracy：
  1. ±0.1%+2digits( 0.9-500 )
  2. ±0.2%+2digits( 501-2000 )
  3. ±0.5%+2digits( 2001-10000 )                              
  • Resolution: 0.0001 minimum
  • Working power supply：AC220V±10% 50±1Hz
  • Ambient temperature: – 10 ℃ ~ 40 ℃
  • Relative humidity: ≤ 85%, no condensation
Features:
  1. Three-phase inverter for accurate, harmonic-free measurements with generator compatibility.
  2. Speeds up testing, measures angles, and auto-detects wiring groups (0-11).
  3. Works with various transformer types and provides comprehensive parameters.
  4. Built-in protections for stability (reverse connection, short circuits, tap misalignment).
  5. Auto-measures transformer ratio, error, and tap positions (up to 99).
  6. 7-inch HD touch screen with Chinese prompts for easy use.
  7. Supports printing, USB, and RS232 for paperless operation.
  8. Durable, shockproof, waterproof case for field use.
Specifications:
  • Range: 0.9-10000
  • Accuracy:
  1. ±(reading × 0.1% + 2 characters) (less than or equal to 500);
  2. ±(reading × 0.2% + 2 characters) (greater than or equal to 500 and less than or equal to 3000);
  3. ±(reading × 0.3% + 2 characters) (greater than or equal to 3000)
  • Resolution:
  1. 0.9~9.9999 (0.0001);
  2. 10~99.999 (0.001);
  3. 100~999.99 (0.01);
  4. 1000~9999.9 (0.1);
  5. 10000 and above (1)
Features:
  1. Dual Power Supply: Supports lithium battery or 220V AC input, allowing over 100 transformer tests on a single charge.
  2. Blind Testing: Conducts ratio and group tests without knowing the connections.
  3. Expanded Testing: Includes CT ratio polarity testing in addition to standard transformer, Z-type, and PT tests.
  4. Wide Range & Accuracy: Measures up to 10,000 with 0.3% accuracy at max.
  5. Safety Protections: Includes reverse connection and output short-circuit protection.
  6. Bright Display: 5.6-inch high-brightness color LCD, visible in sunlight.
  7. Data Printing: Built-in thermal printer for easy printing.
  8. Storage Options: Internal and USB storage for easy data saving.

Why Choose Our TTR Testers?

  • High Precision and Reliability: Our testers provide precise and reliable measurements, ensuring high-quality data for effective decision-making.
  • Compliance with Standards: Meets international standards such as IEC, ASTM, and IEEE, ensuring standardized and dependable testing results.
  • Durable and Robust: Built with high-quality materials for long-lasting performance in various testing environments.
  • Comprehensive Support: Our team of experienced engineers offers full technical support, from initial setup to ongoing maintenance and troubleshooting.
  • Innovative Technology: Incorporates the latest technological advancements to deliver efficient and accurate testing solutions.

What Constitutes an Acceptable Test Result?

According to IEEE Standard C57.152-2013 (Guide for Diagnostic Field Testing of Fluid-Filled Power Transformers, Regulators, and Reactors), the tolerance of the voltage ratio should be within ±0.5% of the specified nameplate voltage for all windings and taps.

Example Calculation:

  • Nameplate Voltage Ratio:
    To calculate the nameplate ratio, divide the primary voltage by the secondary voltage.
    Example:
    360 V ÷ 247 V = 1.4574

  • Tolerance Range:
    Based on the ±0.5% tolerance, calculate the lower and upper limits:

    • Lower Limit:
      1.4574 × 0.995 (−0.5%) = 1.4502
    • Upper Limit:
      1.4574 × 1.005 (+0.5%) = 1.4648
What Is an Acceptable Test Result?

An acceptable test result falls within the range of 1.4502 to 1.4648. If the test result is within this range, it indicates that the equipment is performing within acceptable limits. If the result falls outside this range, further investigation is necessary.

Contact Us:

For more information about our Transformer Turns Ratio (TTR) Testers or to request a quote, please contact us at email: Sale@hvtesttech.com or call us: +1 323 522 4623

Your trusted partner in advanced high-voltage testing solutions.

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