Transformer Testing
GD-700 Automatic Turns Ratio & Vector-Group Tester
Automatic turns-ratio and vector-group tester that completes three-phase ratio testing in one operation, identifies connection groups 0-11 and tap positions, with Z-connected transformer support.
Overview
Automatic turns-ratio and vector-group tester that completes three-phase ratio testing in one operation, identifies connection groups 0-11 and tap positions, with Z-connected transformer support.
Standards & Compliance
Benchmark standards for this equipment category
Systems in this category are commonly specified against these standards, linked to the issuing body. Final configuration and acceptance criteria follow the standard and edition you nominate.
- IEC 60076-1 — Power transformers - General
- IEC 60076-3 — Insulation levels and dielectric tests
- IEC 60076-5 — Ability to withstand short circuit
- IEEE C57.12.90 — Test code for liquid-immersed distribution and power transformers
- GB 1094 — Power transformers
- GB 50150 — Hand-over test of electrical equipment
Application Scenarios
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Get a QuoteDetailed Description
Overview: the GD-700 overcomes the shortcomings of the traditional ratio bridge, which is cumbersome to operate, gives unintuitive readings and requires conversion to test only one phase. The instrument completes three-phase ratio testing in one operation with fast speed and high accuracy.
Power supply: it samples a digitised three-phase inverter test supply with no harmonic content and easily adjusted voltage, eliminating the influence of AC220V or generator supply on start and stop.
Features: it provides a three-phase test supply, identifies connection groups 0-11, supports Z-connected transformers, and measures up to 197 tap positions. It has complete protection - HV/LV reverse-connection, turn-to-turn short-circuit and output short-circuit protection - and uses a 7-inch 65K colour touchscreen LCD.
Construction: it uses a cold-resistant, temperature-resistant, sealed, waterproof, drop- and shock-proof multi-function engineering plastic case for field testing, with a non-volatile clock and data storage.
Technical Specifications
| Range | 0.9-5000 |
|---|---|
| Accuracy (below 500) | ±(0.1% + 2 digits) |
| Accuracy (500-2000) | ±(0.2% + 2 digits) |
| Accuracy (above 2000) | ±(0.3% + 2 digits) |
| Resolution | Minimum 0.0001 |
| Power supply | AC220V±10%, 50Hz |
| Operating temperature | -20°C to 40°C |
| Relative humidity | ≤85%, no condensation |
Frequently Asked Questions
What is the GD-700 Automatic Turns Ratio & Vector-Group Tester used for?
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Further Reading
Method and selection guides that cover the tests this instrument performs.
Reviewed by the Application Engineering Team at Nanjing Gaodian Electric Power Equipment
Specifications are taken from the manufacturer’s technical documentation. Final configuration and acceptance criteria follow the standard and edition you nominate — tell us your test list and we will confirm the ratings.
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