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-2020
On-Load Tap Changer Tester with 9 A Current Source
OLTC tester for transition time, waveform, resistance and three-phase synchronism: 9 A current source, 0.01 ms resolution, 800×480 touch screen, printer.
- Transition time, waveform, resistance and three-phase synchronism in one test
- Tests with or without the windings connected
- Constant current source with four ranges, up to 9 A
- Automatic fault marking on the waveform, e.g. open contacts
- Automatic identification of single and double transition resistors
- 800 × 480 colour touch screen; external mouse supported
- Thermal printer, 1000 results in memory, USB storage and Word reports
- Protection against wrong connection (e.g. 380 V) and overcurrent
- English user interface; English operating system available
Overview
The HUAC-2020 tests the on-load tap changers (OLTCs) of power transformers in substations and industrial plants. It measures transition time, transition waveform, transition resistance and three-phase synchronism, for preventive testing and fault diagnosis: poor contact, wear or open circuits in the tap changer mechanism show up clearly in the waveform.
A constant current source with four ranges, up to 9 A, gives accurate resistance measurement. Tests can be made with or without the windings connected. An embedded computer with an 800 × 480 colour touch screen controls the instrument, identifies single and double transition resistors automatically and marks faults such as open contacts on the waveform. Results are stored, printed on the built-in thermal printer and turned into Word reports with the PC software. The rugged, interference-resistant design suits harsh field conditions.
See all transformer test equipment, including our other OLTC testers, or send us your transformer data and we will recommend the right instrument.
Technical specifications
| Output | |
|---|---|
| Current source | 9 A / 3 A; 3 A / 1 A; 1.5 A / 0.5 A; 0.6 A / 0.2 A ranges |
| Max. port voltage | 24 V |
| Resistance | |
| Range | 0.1 – 100 Ω |
| 3 A range | 0.1 – 6 Ω |
| 1 A range | 0.4 – 20 Ω |
| 0.5 A range | 4 – 40 Ω |
| 0.2 A range | 10 – 100 Ω |
| Resolution | 0.01 Ω |
| Accuracy | ±5 % of reading ±0.1 Ω |
| Time | |
| Recording length | 300 ms |
| Sampling rate | 30 kHz |
| Resolution | 0.01 ms |
| Accuracy | Reading ±0.25 ms |
| General | |
| Display | 800 × 480 colour TFT touch screen |
| Data storage | 1000 sets internal; USB drive |
| Power supply | 220 V AC ±10 %, 50 / 60 Hz |
| Interface language | English |
| Environment | |
| Conditions | -10 – 40 °C, RH < 85 % |
Specifications may change without notice. Contact us for the latest datasheet.
Applications
On-load tap changersPower transformersSubstationsIndustrial plants
Downloads
The datasheet and user manual for this instrument are sent on request, usually within one business day.
Frequently asked questions
What faults does an OLTC test find?
Poor contact, contact wear and open circuits in the tap changer mechanism, as well as wrong transition times and transition resistance values.
Do the windings have to be disconnected?
No. The HUAC-2020 tests with or without the windings connected.
Why a 9 A current source?
A higher test current gives a stronger, more stable signal on low transition resistances. Four current ranges cover transition resistances from 0.1 Ω to 100 Ω.
Have another question? Ask our application engineers.
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