EN
GDB-D Transformer Turns Ratio & Vector Group Tester
GDB-D Digital Intelligent Basic Transformer Turns Ratio & Vector Group Tester (0.9-10000 Range) with ±0.05% Accuracy, Auto Vector Group Identification, Three-Phase Synchronous Sampling, On-Load Tap Changer Test Support, for 10kV-220kV Power Transformer On-Site Test.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDB-D is a high-precision, cost-effective basic transformer test instrumentexclusively designed for fast and accurate measurement of turns ratio, vector group, polarity and phase angle difference 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 all-in-one integrated design with a built-in three-phase test power supply, eliminating the need for external auxiliary equipment. Equipped with a 7-inch high-resolution color touch screen and intuitive graphical interface, it supports one-time wiring to complete all test items including three-phase turns ratio, vector group, polarity and phase angle difference. It can automatically calculate turns ratio error and judge pass/fail according to standards. With a built-in 7.4V/6Ah lithium battery, it can work continuously for more than 4 hours without external power supply, making it ideal for on-site testing. Ideal for transformer factory outgoing inspection, power company on-site maintenance, third-party testing institution on-site acceptance and industrial enterprise transformer commissioning tests.
Specifications
| Parameter | Specification |
|---|---|
| Turns Ratio Test | |
| Test Range | 0.9 – 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) |
| Polarity Test | Yes (automatic judgment) |
| Phase Sequence Test | Yes (automatic detection and correction) |
| Blind Test Function | Yes (no 铭牌 information required) |
| On-Load Tap Changer Test | |
| Maximum Taps | 99 taps |
| Continuous Test | Yes (no discharge between tap changes) |
| Tap Position Tracking | Yes (automatic identification) |
| General Parameters | |
| Display | 7-inch high-resolution color touch 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 | AC 220V±10%, 50Hz + built-in 7.4V/6Ah lithium battery |
| Battery Life | >4 hours continuous operation |
| Charging Time | ~3 hours (full charge) |
| Protection Functions | Over-voltage, Over-current, Short-circuit, Reverse polarity, High-low voltage reverse connection |
| Dimensions (mm) | 320×240×150 (L×W×H) |
| Weight | ~3.5kg (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: rectifier transformers, furnace transformers, traction transformers, Z-type grounding transformers
- Instrument transformers: current transformers (CT) and voltage transformers (VT)
- Single-phase transformers: pole-mounted transformers, lighting transformers
Typical Usage Scenarios
- Transformer manufacturing plants: factory acceptance tests (FAT) of distribution transformers
- Power companies: on-site preventive maintenance tests of substation transformers
- Third-party testing institutions: on-site acceptance and compliance testing
- Industrial and mining enterprises: transformer commissioning and preventive maintenance
- Power plants: generator transformer and auxiliary transformer tests
- 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
High Precision Measurement
±0.05% turns ratio accuracy and ±0.1° phase angle accuracy → detects minute turns ratio errors caused by winding deformation, turn-to-turn short circuits and tap switch faults
Automatic Vector Group Identification
Automatically identifies all common transformer vector groups → eliminates manual judgment errors, reduces operator skill requirements
Three-Phase Synchronous Test
One-time wiring completes all three-phase tests in 10 seconds → improves test efficiency by 70% compared to traditional single-phase testers
On-Load Tap Changer Test Support
Continuous test of all taps without discharging → greatly improves test efficiency of on-load tap-changing transformers
Portable & Long Battery Life
3.5kg ultra-lightweight design with 4-hour battery life → easy to carry and operate in narrow spaces and remote locations
Comprehensive Safety Protection
Multiple protection layers + high-low voltage reverse connection protection → maximum safety for operators and expensive test equipment
High Cost-Effectiveness
Excellent performance at an entry-level price → ideal for small and medium-sized enterprises and basic test teams
FAQ
Q: What vector groups does GDB-D support?
A: It supports all common transformer vector groups including Dyn11, Yyn0, Yd11, YNd11, Yy0, Dd0, Znyn11, etc. It can automatically identify the vector group without manual setting.
Q: Can it test on-load tap-changing transformers?
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.
Q: What is the test speed?
A: It takes ≤10 seconds to complete a three-phase test and ≤3 seconds to complete a single-phase test, which is 70% faster than traditional single-phase testers.
