Transformer Turns Ratio Tester|XHBB128B
Introduction
The XHBB128B Transformer Turns Ratio Tester is a three-phase precision instrument for verifying transformer turns ratio and voltage ratio. During the production of semi-finished and finished power transformers, and before newly installed transformers are put into operation, it checks turns ratio correctness, tap changer condition, inter-turn short circuits, and parallel operation capability. Unlike traditional ratio bridges with non-intuitive phase-by-phase readings, the XHBB128B uses a three-phase precision inverter power supply for fast testing and high accuracy.
Key Features
Uses a three-phase precision inverter power supply instead of single-phase mains supply, eliminating harmonic influence during measurement for more accurate results; unaffected when the working power source is a generator.
Three-phase output improves test speed, measures interphase angle, and automatically identifies transformer wiring groups 0-11.
Wide transformer compatibility, especially Z-type, rectifier, grounding, electric furnace, phase-shifting and balance transformers, with the most comprehensive measurement parameters.
Self-made precision three-phase inverter supply with high and low voltage reverse connection protection, inter-turn short circuit protection, tap changer opening and closing failure protection, and full output short circuit protection for enhanced stability.
After entering rated parameters, automatically measures transformer ratio, error value and tap changer position; accurately measures asymmetric tapping and supports up to 99 tapping points.
7-inch high-definition color touch screen LCD with modular display and step-by-step prompts, completing instrument operation without a manual.
Print output, USB flash drive interface and RS232 interface for convenient paperless office.
Multi-functional engineering plastic case that is cold and temperature resistant, sealed and waterproof, and drop and shock resistant for field testing.
Technical Specifications
| Test range |
0.9 ~ 10000 |
| Measurement accuracy |
±0.1% + 2 digits (0.9-500)
±0.2% + 2 digits (501-2000)
±0.5% + 2 digits (2001-10000) |
| Resolution |
0.0001 minimum |
| Output voltage |
Automatically adjusts according to load |
| Power supply |
AC220V ±10%, 50 ±1 Hz |
| Ambient temperature |
-10ºC ~ 40ºC |
| Relative humidity |
≤ 85%, no condensation |
| Dimensions |
Host: 360 × 290 × 170 mm
Cable box: 360 × 290 × 170 mm |
| Weight |
Host: 5.9 kg
Cable box: 5.65 kg |
Who Is It For
Built for production-line and field professionals who need fast, accurate turns ratio verification on standard and special-purpose transformers, the XHBB128B serves a broader audience than conventional substation-only ratio bridges:
Transformer manufacturing plants running production-line QC on semi-finished and finished transformers.
Power plant and substation commissioning and preventive maintenance engineers.
Third-party electrical testing and inspection agencies.
Service teams for special-purpose transformers such as Z-type, rectifier, electric furnace, phase-shifting and balance transformers.
Packing List
Product Details
FAQ
1. Who is this turns ratio tester designed for?
It is built for transformer manufacturing plants running production-line QC on semi-finished and finished units, and for commissioning and maintenance engineers at power plants, substations and third-party testing agencies who need fast, accurate ratio verification in the field.
2. Can it test special-purpose transformers such as Z-type, rectifier or electric furnace transformers?
Yes. Unlike generic single-purpose ratio bridges, it supports Z-type, rectifier, grounding, electric furnace, phase-shifting and balance transformers, making it the right choice for service teams handling non-standard transformer fleets.
3. Does it automatically identify the transformer winding group?
Yes. Its three-phase inverter output measures interphase angle and automatically identifies wiring groups 0-11, which is essential for QC engineers verifying winding correctness on production lines.
4. How many tap changer positions can it verify?
It supports up to 99 tapping points and automatically calculates the ratio error and the exact tap position, including asymmetric tap changers, ideal for maintenance crews checking on-load tap changers.
5. What measurement range and accuracy can field engineers expect?
It covers a 0.9-10000 ratio range with ±0.1% + 2 digits accuracy (0.9-500), ±0.2% + 2 digits (501-2000) and ±0.5% + 2 digits (2001-10000), ensuring reliable readings for both production QC and preventive maintenance.
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