Product Introduction:
The Transformer LV Short-circuit Impedance Tester is designed for low-voltage load impedance testing of power transformers (single-phase or three-phase) during delivery, overhaul, trial operation, and handover testing.
It measures the short-circuit impedance (%) of the power voltage on site and compares the result with the value indicated on the nameplate or the factory default setting. This comparison helps identify defects such as winding displacement or deformation caused by fault currents during transformer installation, operation, or following major failures after delivery testing. According to the CICED 2000 standard, a short-circuit impedance change exceeding ±3% is considered significant.
The tester does not require an external voltage regulator and adopts a primary connection mode. Once parameters are entered, it automatically performs three-phase testing and calculates the impedance error percentage, providing intuitive and easy‑to‑interpret results. It is a fast, reliable tool for on‑site detection of winding deformation in transformers.
Technical parameters:
| Scope of voltage measurement: 5~400V | Accuracy of measurement: 0.2d |
| Scope of current measurement: 0.1~20A | Operating power: AC220V±10% |
| Power frequency: 50Hz | Operating temperature: -10℃~50℃ |
| Ambient humidity: ≤85%RH | Net weight: 6kg |
Product Features:
1. The tester is powered by AC220V low voltage, automatically supplying current to the AB, BC, and CA high-voltage windings of the transformer. It collects data simultaneously and calculates the impedance error percentage automatically, providing intuitive testing results.
2. The tester performs three-phase testing automatically using the primary connection method, rather than the inverse connection with the testing wires.
3. The tester supports both single-phase and three-phase testing, with options for manual or automatic operation.
4. The tester adjusts the output current to match the test item’s impedance limits.
5. The test item can be measured without the need for an external voltage regulator.
6. The tester includes functionality for measuring zero-sequence impedance.
7. It also supports inductance measurements.
8. The tester features a large LCD display with a Chinese menu, simplifying operation with on-screen notes and guidance.
9. The tester offers printing and storage capabilities, with high testing accuracy, advanced automation, compact size, and lightweight design.
