Metrel WR Analyser device, a transformer winding resistance analyzer, featuring a screen, buttons, ports, and emergency stop button in a rugged case.

MI 3281 Winding Resistance Analyser

The MI 3281 WR Analyser is a portable test instrument intended for diagnosing the winding resistance (with a selectable test current in the range from 10 mA to 20 A) of single and three-phase transformers with manual or automatic tap changer tests and demagnetization of tested transformers.

Typically ‘In stock’ subject to prior sales. Contact us to confirm stock level before ordering.
If nil stock at time of order, lead time is typically ~4 weeks.

SKU: MI-3281

Price range: $18,009.00 through $19,286.00 ex. GST

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The MI 3281 Winding Resistance Analyser (WR Analyser) is a portable test instrument intended for diagnosing of winding resistance of single and three phase transformers with manual or automatic tap changer test and demagnetization of tested transformer. Selectable test current in range from 10 mA to 20 A. The operation is straightforward and clear to enable the user to operate the instrument without the need for special training. For advanced users the AUTO SEQUENCES and visual tests are available.

Measuring Functions

Available functions and features offered by the WR Analyser:

Winding resistance measurement of single and three phase transformers;
Winding resistance measurement of single and three phase transformers with manual or automatic tap changer test (automatic measurement of all windings);
Demagnetization of single and three phase transformers.

Selectable test current up to 20 A.
Automatic winding resistance tests of transformers with On-Load or No-Load Tap Changer.
Automatic discharge after finished measurement.
Built-in help screens for referencing on site.
EMERGENCY STOP switch in case of any emergency situation.
A 4.3” color LCD display with touch screen offers easy-to-read results and all associated parameters.
The operation is straightforward and clear to enable the user to operate the instrument without the need for special training.
Test results can be stored on the instrument.
PC SW Metrel ES Manager for creation of test structures and uploading, downloading of test results, Auto Sequence® editor and report generation.
Generation and printing of reports (optional)
BT communication with PC, Android tablets and smart phones via built-in BT.
Winding resistances conversion to a desired reference temperature.
Degree of protection IP 65 (case closed), IP 40 (case open).

Technical Specifications
Function		Measuring range	Resolution	Accuracy
Winding resistance R_H, R_X, R₁₀, R₂₀, R₃₀, R₁₂, R₂₃, R₃₁	20 A, 15 A, 10 A	10.0 µΩ … 1999.9 µΩ	0.1 µΩ	±0.25% of reading ±0.1 % Range
		2.000 mΩ … 19.999 mΩ	1 µΩ
		20.00 mΩ … 199.99 mΩ	10 µΩ
		200.0 mΩ … 1999.9 mΩ	100 µΩ
	5 A, 1 A	0.100 mΩ … 19.999 mΩ	1 µΩ	±0.25% of reading ±0.1 % Range
		20.00 mΩ … 199.99 mΩ	10 µΩ
		200.0 mΩ … 1999.9 mΩ	100 µΩ
		2.000 Ω … 19.999 Ω	1 mΩ
	100 mA	1.00 mΩ … 199.99 mΩ	10 µΩ	±0.25% of reading ±0.1 % Range
		200.0 mΩ … 1999.9 mΩ	100 µΩ
		2.000 Ω … 19.999 Ω	1 mΩ
		20.00 Ω … 199.99 Ω	10 mΩ
	10 mA	10.0 mΩ … 1999.9 mΩ	100 µΩ	±0.25% of reading ±0.1 % Range
		2.000 Ω … 19.999 Ω	1 mΩ
		20.00 Ω … 199.99 Ω	10 mΩ
		200.0 Ω … 999.9 Ω	100 mΩ
		1.000 kΩ … 9.999 kΩ	1 Ω	±2% of reading ±2% Range

General
Test current accuracy	±15%
Open terminal test voltage	<30 VDC
Max. short-circuit test current	20 A
Automatic discharge	Yes
Mains power supply	100 VAC … 240 VAC, 45 Hz … 65 HZ, 650 VA
Over-voltage category	300 V / CAT II
Pollution degree	2
Degree of protection	IP 65 (closed), IP 40 (open)
Dimensions	470 x 190 x 370 mm
Weight	9.3 kg, (without accessories)
Display	4.3” (10.9 cm) 480 × 272 pixels TFT color display
Memory	> 1 GB