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-ZK-III
Transformer Low-Voltage Short-Circuit Impedance Tester
Measures transformer short-circuit impedance at low voltage and compares it with the nameplate to detect winding deformation. Class 0.2, 5–400 V, 0.1–20 A.
- Single-phase and three-phase power transformers
- Class 0.2 voltage and current measurement
- Fast, repeatable measurement
- Direct comparison with nameplate impedance
- Clear guidance on interpreting the deviation
- Compact for field use
- English user interface; English operating system available
Overview
The HUAC-ZK-III measures the low-voltage short-circuit impedance of single-phase and three-phase power transformers during factory acceptance, overhaul, preventive maintenance and handover tests.
Comparing the measured short-circuit impedance (%) with the nameplate or factory value reveals winding displacement or deformation caused by transport, installation or short-circuit currents in service. The test is quick, the result is easy to interpret, and the instrument is light enough for field work.
See the full range of transformer test equipment, or send us your transformer data and we will recommend the right instrument.
Technical specifications
| Measurement | |
|---|---|
| Voltage | 5 – 400 V, class 0.2 |
| Current | 0.1 – 20 A, class 0.2 |
| Interpretation | |
| Deviation ≤ ±2 % | Normal |
| Deviation ±2 % – ±5 % | Inspect periodically |
| Deviation > ±5 % | Take out of service for inspection |
| General | |
| Power supply | 220 V AC ±10 %, 50 Hz ±10 Hz |
| Ambient temperature | -10 – 50 °C |
| Humidity | ≤ 85 % RH |
| Interface language | English |
Specifications may change without notice. Contact us for the latest datasheet.
Applications
Power transformersAfter short-circuit faultsAcceptance and handover testsPreventive maintenance
Downloads
The datasheet and user manual for this instrument are sent on request, usually within one business day.
Frequently asked questions
What does short-circuit impedance show?
A change in the short-circuit impedance compared with the nameplate value means the winding geometry has changed, which points to displacement or deformation.
How do I interpret the result?
Within ±2 % the transformer is normal; between ±2 % and ±5 % it should be inspected periodically; beyond ±5 % it should be taken out of service and examined.
How does it relate to FRA?
Short-circuit impedance and frequency response analysis are complementary methods for winding deformation. See our winding deformation testers for FRA.
Have another question? Ask our application engineers.
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