3 phase ttr tester The JH2702TN Transformer Turns Ratio Tester is built for field engineers who need speed and precision. Unlike standard TTR testers, this unit features a dedicated neutral point terminal. This allows you to test Yn/yn and Z-type transformers directly without messy auxiliary wiring for routine ttr test of transformer.
Powered by a three-phase CNC sine inverter, the JH2702TN reliable transformer tester delivers stable power for fast, accurate measurements. Whether you are testing distribution transformers or high-voltage main transformers, the device automatically identifies vector groups and calculates ratio errors.
The 7-inch color touch screen displays vector diagrams in real-time. When the job is done, print the report instantly using the built-in thermal printer. Rugged, lightweight, and battery-ready, it is the reliable partner for your outdoor substation work.
Products Feature
Intuitive 7-Inch Touch Screen
High-res TFT display with multi-language menus for easy navigation and clear real-time data.
Segmented High Precision
Graded accuracy captures tiny ratio errors for both distribution and high-voltage main transformers , ideal for professional ttr electrical testing.
Multi-Stage Resolution
Delivers a 0.0001 minimum resolution for low ratios and a 1-step resolution for the maximum 20,000 ratio, core performance of industrial ttr test equipment.
All-Weather Battery
Built-in lithium battery with overcharge protection (auto-stops at 90%). Ensures stable operation from -10℃ to 50℃ without external power.
Highly Portable
Weighs only 4.7kg (320×280×135mm). Designed for easy single-person field transport.
Color-Coded Clamps
Clearly marked HV/LV terminals prevent wiring mistakes and save setup time.
Integrated Thermal Printer
Features paper shortage alerts and quick replacement for instant on-site reporting.
Global Power Compatibility
Supports AC 100-240V (50/60Hz) for seamless use worldwide.
Auto Vector Group ID
Built-in library auto-identifies Yy, Yd, Dy, Dd, and Z-series connections without manual lookups.
Damp Environment Ready
Operates reliably below 90% relative humidity (no condensation), perfect for underground power rooms.
Secure Data Management
Stores up to 100 complete test records locally. Features a dedicated time calibration module for authentic, synchronized timestamps.
Operator Safety First
Includes a reserved safety grounding terminal that must be reliably connected during high-voltage tests to prevent accidents.
Products Parameter
| Parameter | Specification |
|---|---|
| Model | JH2702TN |
| Turns Ratio Range | 0.9 ~ 20,000 |
| Accuracy (Ratio ≤ 1000) | ± (reading × 0.1% + 2 digits) |
| Accuracy (1000 < Ratio ≤ 3000) | ± (reading × 0.2% + 2 digits) |
| Accuracy (Ratio > 3000) | ± (reading × 0.3% + 2 digits) |
| Resolution | 0.9 ~ 9.9999 (0.0001) 10 ~ 99.999 (0.001) 100 ~ 999.99 (0.01) 1000 ~ 9999.9 (0.1) 20,000 (1) |
| Power Supply | AC 100-240V, 50/60Hz (Battery charging supported) |
| Dimensions | 320 × 280 × 135 mm |
| Weight | 4.7 kg |
| Operating Temperature | -10℃ ~ 50℃ |
| Relative Humidity | < 90% (No condensation) |
Application
- Substation Commissioning & Maintenance: Ideal for verifying ratio, polarity, and vector groups of new or repaired power and distribution transformers before energization.
- Z-Type & Neutral Point Transformers: Specifically designed to test Yn/yn and Z-type transformers directly, eliminating complex auxiliary wiring.
- Instrument Transformer Testing: Reliable performance for testing PT (Potential Transformers) and CT (Current Transformers) in protection and metering circuits.
- Renewable Energy Projects: Perfect for field testing transformers in solar farms, wind power stations, and EV charging infrastructure.
- Industrial Power Facilities: Widely used for routine maintenance and troubleshooting in manufacturing plants, mining operations, and underground power rooms.
FAQ
Q: Can this tester measure line-to-phase ratios for neutral point transformers?
A: Yes. It features a dedicated four-color neutral point terminal. This allows you to test Yn/yn connection groups directly without any complex auxiliary wiring.
Q: How does the device calculate tap changer ratio errors?
A: Simply input the tap spacing percentage and the total number of gears in the settings. The system will automatically detect the actual tap position during the test and calculate the precise ratio error.
Q: Why should I choose the JH2702TN over other TTR testers?
A: The JH2702TN is built for comprehensive, one-stop testing. Key advantages include:
1.Ultra-Wide Range: Covers 0.9 to 20,000 with multi-grade high accuracy (±0.1% to ±0.3%), handling everything from small PTs/CTs to high-voltage main transformers.
2.True 3-Phase Capability: Tests both line-to-line and line-to-phase ratios for neutral point transformers natively.
3.Smart Analysis: Automatically identifies tap positions and calculates errors, making large-scale grid maintenance highly efficient.
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