Product Overview
Products Feature
Dedicated Neutral Point Terminal
Test Yn/yn and Z-type transformers directly without auxiliary wiring. Eliminates messy connections and speeds up routine TTR testing.
7-Inch Touch Screen & Auto Vector ID
High-res TFT display shows real-time vector diagrams. Built-in library automatically identifies Yy, Yd, Dy, Dd, and Z-series connections without manual lookups.
0.9–20,000 Ratio Range & Smart Tap Detection
Captures tiny ratio errors with 0.0001 minimum resolution. Automatically detects up to 99 tap changer gears and calculates angle differences instantly.
Built-in Thermal Printer
Prints professional test reports on-site in seconds. Features paper shortage alerts and quick replacement design for continuous fieldwork.
All-Weather Battery Operation
Built-in lithium battery with overcharge protection. Operates stably from -10°C to 50°C without external power, perfect for outdoor substations.
Field-Ready & Safe
Weighs only 4.7 kg for single-person transport. Features color-coded clamps to prevent wiring mistakes, plus dual safety alerts for reversed connections and short circuits.
Products Parameter
| Parameter | Specification |
| Model | JH2702TN |
| Turns Ratio Range | 0.9 – 20,000 |
| Neutral Point Terminal | Dedicated 4-color terminal for Yn/yn & Z-type testing |
| Accuracy (Ratio ≤ 1000) | ±(0.1% reading + 2 digits) |
| Accuracy (1000 < Ratio ≤ 3000) | ±(0.2% reading + 2 digits) |
| Accuracy (Ratio > 3000) | ±(0.3% reading + 2 digits) |
| Resolution | 0.0001 (0.9–9.9999) / 0.001 (10–99.999) / 0.01 (100–999.99) / 0.1 (1000–9999.9) / 1 (20,000) |
| Power Supply | AC 100–240V, 50/60Hz (with battery charging) |
| Operating Temperature | -10°C to 50°C |
| Relative Humidity | < 90% (non-condensing) |
| Dimensions | 320 × 280 × 135 mm |
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.
We are not a trading company. Since 2013, we have designed, manufactured, and shipped professional power testing instruments from our own facility in Wuhan. That hands-on control over R&D, production, and quality inspection lets us offer consistent build quality and competitive pricing to customers in 50+ countries.
01
Full Factory Control
R&D, production, and QC under one roof. No middlemen.
02
Custom Solutions
Engineers recommend fit-for-purpose equipment based on your actual test objects.
03
13+ Years Field Experience
Proven reliability in substations and solar farms across 50+ countries.
04
Warranty & Support
1-year warranty with dedicated pre-sale and post-sale technical support.
FAQ
Q: Can this tester measure line-to-phase ratios for neutral point transformers?
A: Yes. The JH2702TN 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 automatically detects the actual tap position during the test and calculates 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. Its key advantages include:
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.
True 3-Phase Capability: Tests both line-to-line and line-to-phase ratios for neutral point transformers natively.
Smart Analysis: Automatically identifies tap positions and calculates errors, making large-scale grid maintenance highly efficient.
Q: How does the JH2702TN handle test data storage and reporting?
A: It stores up to 100 complete test records locally with synchronized timestamps. You can print professional reports instantly using the built-in thermal printer, or export the data to a PC via USB for long-term archiving.
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