Winding Resistance Tester · Test & Measurement
WRT‑5660
Three‑phase DC winding resistance tester for power transformers and other low‑ohmic applications — 4‑wire Kelvin measurement, selectable test currents 0.2/0.5/2/5/10/20 A, assisted de‑magnetisation, temperature conversion, automatic 3‑phase unbalance display, 7″ touchscreen, built‑in printer and 500‑set memory.
0.1 µΩ–5000 Ω range±0.2%FS ±5 dgtResolution 0.001 mΩ
0.2–20 A (6 steps)Max 20 A / 27 V1200 W rating
4‑wire Kelvin7″ touchscreenPrinter & 500 sets
Key features
Three‑phase measurement
Automatic display of phase unbalance for transformer windings.
Wide resistance range
0.1 µΩ – 5000 Ω with 0.001 mΩ minimum resolution.
Selectable test current
0.2 / 0.5 / 2 / 5 / 10 / 20 A; max current 20 A (±10%).
Fast, safe testing
Assisted de‑magnetisation and automatic discharge after test.
Touchscreen & printer
7″ colour LCD with built‑in thermal printer; 500 sets memory.
Rugged, high power
Rated measuring power 1200 W; 27 V no‑load voltage.
Where the WRT-5660 excels
Power transformers
Winding resistance & longitudinal tap‑changer checks.
Substation maintenance
Grounding continuity, busbar joints and contact resistance.
Cables & coils
Low‑ohmic measurements on motors, coils and conductors.
Factory testing
Temperature‑rise tests and production QA documentation.
Ranges & key specifications
| Parameter | Specification |
|---|---|
| Resistance range | 0.1 µΩ – 5000 Ω; ±0.2%FS ±5 dgt; min. resolution 0.001 mΩ |
| Measurement method | 4‑wire Kelvin |
| Output current (settings) | 0.2 / 0.5 / 2 / 5 / 10 / 20 A (max 20 A ±10%) |
| No‑load maximum voltage | DC 27 V (±10%) |
| Rated measuring power | 1200 W |
| Features | Assisted de‑magnetisation, temperature conversion, auto discharge, 3‑phase unbalance display |
| Display & printer | 7″ touchscreen colour LCD; built‑in thermal printer |
| Memory | 500 sets; adjustable auto shutdown 5/10/15/20/25/30 min |
| Power supply | AC 220 V / 50 Hz, 10 A |
| Power consumption | Standby ≤110 W; Measurement ≤1500 W |
| Dimensions / mass | 400 × 300 × 210 mm; ≈ 6.2 kg |
| Operating / storage | −10–40 °C, RH<80%; storage −10–60 °C, RH<70% |
See datasheet for full specifications and conditions.
What’s in the box
Standard accessories
- Test cables: red 5 m, blue 5 m, yellow 5 m, green 5 m (2 of each)
- USB cable & software CD
- Power cable
- User manual
- Leads bag
Items may vary by configuration.
Safety & Compliance
EMC
Designed to meet EMC requirements for field use (see datasheet).
WARRANTY
1‑year warranty (with product registration; see datasheet).
Downloads
Test hookup diagrams — WRT-5660
Single winding — 4-wire Kelvin
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- Connect I+ / I- to the winding ends (H, X).
- Clip V+ / V- inside the current clips (Kelvin) to remove lead resistance.
- Select suitable test current (e.g., 2–20 A for power transformers), start test, wait for stabilisation.
Tip: For large windings, start with a lower current to check heating, then increase.
Three-phase overview
- Measure phases A, B, C in sequence with the same current.
- Use the instrument’s unbalance display to compare results directly.
- If needed, run de-magnetisation between tests on large cores.
Tip: Apply temperature conversion for like-for-like comparisons against nameplate.
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