HUAC-2071
Three-Phase Transformer Turns Ratio Tester (TTR), Battery Powered
Battery-powered three-phase TTR tester: ratio, vector group and polarity in about 10 seconds with one connection, ratio 0.9 to 10,000, 3.5 kg.
MODEL HUAC-RZ-3000
Sweep Frequency Response Analyzer (SFRA) with Built-In PC
SFRA transformer winding deformation tester with built-in industrial PC: linear and segmented sweep 10 Hz–10 MHz, automatic diagnosis, Word reports.
- Integrated industrial PC: no laptop needed on site
- Linear sweep 10 Hz – 10 MHz and segmented sweep 0.5 kHz – 1 MHz
- High-speed DDS sweep source and dual-channel 16-bit sampling
- Phase-to-phase and historical comparison with automatic grading
- Linear or logarithmic frequency axis
- Automatic Word reports
- English user interface; English operating system available
DL/T 911
Overview
Once a transformer is built, the inductance and capacitance of each winding are fixed, and so is its frequency response. Short circuits, transport shocks and fault currents can displace or deform the windings, which changes the frequency response. The HUAC-RZ-3000 measures this response to detect winding distortion, bulging, displacement, tilting, inter-turn short circuits and inter-phase contact.
The instrument has an integrated industrial PC, so no separate laptop is needed on site. It supports both linear and segmented frequency sweeps, and compares the three phases with each other and with historical data to grade the winding condition automatically. Results are saved as Word reports. It follows DL/T 911, the Chinese power-industry standard for frequency response analysis of transformer winding deformation.
See the full range of transformer test equipment, or send us your transformer data and we will recommend the right instrument.
Technical specifications
| Sweep | |
|---|---|
| Linear sweep | 10 Hz – 10 MHz, 40,000 points; 0.25 / 0.5 / 1 kHz spacing |
| Segmented sweep | 0.5 kHz – 1 MHz, 2000 points |
| Measurement | |
| Amplitude range | -120 dB – +20 dB |
| Amplitude accuracy | 0.1 dB |
| Frequency accuracy | 0.01 % |
| Input / output impedance | 1 MΩ / 50 Ω |
| Same-phase repeatability | 99.9 % |
| General | |
| Instrument dimensions | 355 × 145 × 270 mm |
| Case dimensions | 410 × 360 × 350 mm |
| Total weight | 17 kg |
| Interface language | English |
Specifications may change without notice. Contact us for the latest datasheet.
Applications
Power transformersAfter short-circuit faults or transportAcceptance testsCondition assessment
Downloads
The datasheet and user manual for this instrument are sent on request, usually within one business day.
Frequently asked questions
What is SFRA?
Sweep frequency response analysis injects a low-voltage signal over a wide frequency range into one end of a winding and measures the response at the other end. Changes in the response reveal mechanical changes in the winding.
Do I need earlier measurements?
A baseline makes diagnosis easier, but without one the instrument compares the three phases with each other to assess the windings.
Does the transformer have to be opened?
No. Only the connections to the bushings are removed; the tank stays closed.
Have another question? Ask our application engineers.
Request a quote
Get pricing for the Sweep Frequency Response Analyzer (SFRA) with Built-In PC
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- You get a recommendationThe right model and options, with a datasheet and quotation.
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Transformer Turns Ratio Tester with Thermal Printer
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