The Motwane IT-51 is a microprocessor based digital insulation tester designed for testing various types of electrical apparatus like transformers, switchgear, motors, generators, cables, and substation products. IT-51 has a digital display and an analog for arc display. It automatically performs IR Test and Polarization Index by selecting modes. IT-51 has a large LCD white backlight display that shows leakage current in scrolling form along with its IR value and PI value.
Insulation Resistance Test: The IR test is an acceptance test which is important for future comparative purposes. It helps to determine the suitability of the electrical apparatus for energizing or for the application of the high-potential (hi-pot) test. The IR test must attain successful completion to validate the factory warranty. It must be conducted immediately before energizing the electrical apparatus or before commencing the high potential test.
Polarization Index Test: This is an extension of the IR test. In this test, two IR measurements are considered where the first reading is taken at 1 min and the second reading is taken at 10 mins. Then the ratio of the 10 min reading is compared to a 1 min reading which is then calculated to give the PI dielectric absorption value. The PI of winding-to-winding and winding-to-ground is determined. A PI value of below 2 is indicative of insulation deterioration and should be investigated further.
IT-51 is a lightweight instrument that can be easily moved around for electrical testing. It has rechargeable battery operation along with an AC mains provision for battery charging. It also has an ingress protection of IP54. The device has automatic capacitive loads discharged at the end of the test.
The Insulation Resistance test is an essential test that helps to check the condition of electrical insulation. The insulation resistance quality of an electrical system degrades with time and with environmental conditions such as temperature, humidity, moisture, and dust particles. This device is designed for routine and diagnostic testing like IR, PI of high voltage electrical apparatus including electrical rotating machinery, transformers, HV & LV switchgear, cables, insulators, etc.
Test Voltage : 250V, 500V, 1000V, 2500V, 5000V
Test Voltage Accuracy : ± 5 % of rdg
Short circuit current : 1.4 mA ± 0.5 mA
Programmable Timers : T1 and T2
Analog Display : 1 KΩ to 1 TΩ
Digital Display : (3 Digit Display) 1 KΩ to 1 TΩ
Up to 1GΩ : All Ranges ±( 5 % + 2 digits)
Over 1 GΩ : 5000V ± (5 % + 0.04% per GΩ)
2500V ± (5 % + 0.08% per GΩ)
1000V ± (5 % +0.2% per GΩ)
500V ± (5 % + 0.4% per GΩ)
250V ±( 5 % + 0.8% per GΩ)
AC/DC Voltage Measurement
Range : Up to 600V
Accuracy : ± (5 % of rdg + 5 digits)
Polarization index (PI)
Display range : 0 – 99.9
Accuracy : ±(5 % of reading + 5 digits)
Resolution : 0.01
Power Supply Specifications
Battery: Internal Rechargeable
Display: Custom Built LCD with white a backlight
Mains Power Supply: 110/ 230VAC 50/60Hz
Weight: 5.0 Kg (Approx) (without Accessories)
Dimensions (H X W X L) : 195 mm X 290 mm X 360 mm (Approx)
Operating Temperature: -10°C to 55°C
Storage Temp: -20°C to 70°C
Humidity: less than 95% RH, non 0 condensing max at 40°C
Safety and Standards
Safety in accordance with : EN 61010-1 : 2001
EMC in accordance with EN 61326-1 : 2006
Type Test in accordance with IS 11994
Ingress Protection IP 54
CE & CAT IV 600V
Safety of test lead in accordance with
EN 61010-031 : 2002 +A1 : 2008
Standard Accessories Included
Test leads 3 meter : 1 Set
User manual : 1 No
Calibration sheet : 1 No
Test leads 10 meters : 1 Set
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