EN
GDB-H Handheld Transformer Turns Ratio Tester
GDB-H Digital Intelligent Handheld Fully Automatic Transformer Turns Ratio & Vector Group Tester (0.8-10000 Range) with ±0.05% Accuracy, Full Blind Test Function, Hexagonal Vector Display, Three-Phase Synchronous Test, Built-in 800-Test Battery, for On-Site Power Inspection and Emergency Repair.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDB-H is an ultra-portable, field-optimized handheld transformer test instrumentexclusively designed for fast and accurate on-site inspection and emergency repair of power transformers. It fully complies with DL/T 963-2005, GB 50150-2016 and IEC 60076-1:2022 standards, adopting advanced digital synthesized three-phase power supply and full-digitized sampling technology to eliminate power supply harmonic interference and ensure stable and reliable test results.
The instrument features an ergonomic handheld design weighing only 1.3kg, supporting one-hand operation even in narrow spaces and high-altitude environments. Its industry-leading full blind test function allows measuring turns ratio and vector group without any transformer nameplate information or manual wiring selection. Equipped with a 5.6-inch high-brightness HD color screen and intuitive graphical interface, it displays test results in both digital and hexagonal vector formats for intuitive judgment. With a built-in 7.4V/5Ah high-capacity lithium battery, it can perform more than 800 consecutive tests on a single charge, making it ideal for all-day outdoor operations. Ideal for power company on-site inspection, emergency repair, transformer factory outgoing spot check, third-party testing institution on-site acceptance and industrial enterprise transformer commissioning tests.
Specifications
| Parameter | Specification |
|---|---|
| Turns Ratio Test | |
| Test Range | 0.8 – 10000 |
| Accuracy | ±0.05% of reading ± 2 digits (≤500), ±0.1% of reading ± 2 digits (>500) |
| Resolution | 0.0001 |
| Phase Angle Test | |
| Test Range | 0 – 360° |
| Accuracy | ±0.1° |
| Resolution | 0.01° |
| Vector Group Test | |
| Supported Groups | Dyn11, Yyn0, Yd11, YNd11, Yy0, Dd0, Znyn11, etc. (all common groups) |
| Full Blind Test | Yes (no nameplate information required) |
| Hexagonal Vector Display | Yes |
| Polarity Test | Yes (automatic judgment) |
| Phase Sequence Test | Yes (automatic detection and correction) |
| On-Load Tap Changer Test | |
| Maximum Taps | 99 taps |
| Continuous Test | Yes (no discharge between tap changes) |
| Tap Position Tracking | Yes (automatic identification) |
| Dual Measurement Modes | |
| Turns Ratio Measurement | Yes |
| Operating Voltage Ratio Measurement | Yes |
| General Parameters | |
| Display | 5.6-inch high-brightness HD color screen |
| Data Storage | 500 groups (with time stamp, power-off protection) |
| Data Export | USB interface, PDF/Excel report generation |
| Language Support | Chinese/English bilingual |
| Power Supply | Built-in 7.4V/5Ah lithium battery + AC 220V±10%, 50Hz charger |
| Battery Life | >800 consecutive tests |
| Charging Time | ~3 hours (full charge) |
| Protection Functions | Output short-circuit, Over-voltage, Over-current, Reverse polarity, High-low voltage reverse connection |
| Dimensions (mm) | 246×156×62 (L×W×H) |
| Weight | ~1.3kg (including battery) |
| Operating Temperature | -10℃ ~ +50℃ |
| Operating Humidity | ≤90%RH (non-condensing) |
| Altitude | ≤2000m |
| Compliance | DL/T 963-2005, GB 50150-2016, IEC 60076-1:2022, GB/T 1094.1-2021 |
Applications
Core Test Objects
- Power transformers: 10kV-220kV oil-immersed power transformers (up to 120MVA)
- Distribution transformers: 10kV/35kV oil-immersed and dry-type distribution transformers
- Special transformers: Z-type grounding transformers, rectifier transformers, furnace transformers, traction transformers
- Instrument transformers: Current transformers (CT) and voltage transformers (VT)
- Single-phase transformers: Pole-mounted transformers, lighting transformers, distribution transformers
Typical Usage Scenarios
- Power companies: Daily on-site inspection of substation transformers
- Emergency repair teams: Fast fault diagnosis after transformer failures
- Transformer manufacturing plants: Outgoing spot check and on-site commissioning
- Third-party testing institutions: On-site acceptance and compliance testing
- Industrial and mining enterprises: Transformer routine inspection and maintenance
- Power plants: Generator transformer and auxiliary transformer inspection
- Technical schools and universities: Teaching and demonstration experiments
Advantages
Compliance with International Standards
Fully meets DL/T 963-2005, GB 50150-2016 and IEC 60076-1 standards → test results are globally recognized
Industry-Leading Full Blind Test Function
No need for transformer nameplate information or manual wiring selection → eliminates human errors, reduces operator skill requirements
1.3kg Ultra-Light Handheld Design
One-hand operation, fits in a tool bag → ideal for high-altitude operations and narrow space testing
800 Tests Ultra-Long Battery Life
One charge supports 3-5 days of field work → no need for external power supply, perfect for remote locations
Hexagonal Vector Intuitive Display
Test results displayed in both digital and vector formats → easy to understand, no professional knowledge required
Dual Measurement Modes
Supports both turns ratio and operating voltage ratio measurement → more accurately reflects actual transformer operating conditions
Rugged Anti-Vibration Design
Shockproof rubber cover and high-reliability connectors → withstands harsh field environments and transportation vibrations
Comprehensive Safety Protection
Multiple protection layers + high-low voltage reverse connection protection → maximum safety for operators and test equipment
FAQ
Q: What is the full blind test function?
A: The full blind test function allows the instrument to measure the turns ratio and vector group of a transformer without any nameplate information or manual wiring selection. It automatically identifies the transformer connection mode and vector group, which is extremely useful for testing old, unmarked or damaged transformers.
Q: How long does the battery last?
A: The built-in 7.4V/5Ah lithium battery can perform more than 800 consecutive tests on a single charge, which is sufficient for 3-5 days of field work. The charging time is about 3 hours.
Q: Can it test special transformers such as Z-type grounding transformers?
A: Yes. It supports all common transformer types including Z-type grounding transformers, rectifier transformers, furnace transformers and traction transformers.
Q: Does it support on-load tap changer test?
A: Yes. It supports continuous test of all taps of on-load tap-changing transformers. You can directly switch taps during the test without discharging the transformer, which greatly improves test efficiency.
