Correct Method for Measuring Insulation Resistance

Publisher:MysticSerenadeLatest update time:2016-01-18 Source: eefocus Reading articles on mobile phones Scan QR code
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Modern life is changing with each passing day, and people cannot live without electricity for a moment. In the process of using electricity, there are problems with electricity safety. In electrical equipment, such as motors, cables, household appliances, etc. One of their normal operations is the insulation degree of their insulating materials, that is, the value of insulation resistance. When heated and damp, the insulating materials age. Its insulation resistance decreases. This causes leakage or short circuit accidents in electrical equipment. In order to avoid accidents, it is required to measure the insulation resistance of various electrical equipment frequently. Determine whether its insulation degree meets the needs of the equipment. There are usually two ways to measure ordinary resistance: measuring at low voltage and measuring at high voltage. However, due to the general high value of insulation resistance (generally megohm level), the measured value at low voltage cannot reflect the true insulation resistance value working under high voltage conditions. The megohmmeter is also called an insulation resistance meter. It is the most commonly used instrument for measuring insulation resistance. It has a high voltage power supply when measuring insulation resistance, which is the difference between it and the resistance measuring instrument. The megohmmeter is convenient and reliable for measuring insulation resistance. However, if used improperly, it will bring unnecessary errors to the measurement. We must use the megohmmeter correctly to measure insulation resistance.   

  When the megohmmeter is working, it generates high voltage, and the object of measurement is electrical equipment, so it must be used correctly, otherwise it will cause personal or equipment accidents. Before use, you must first make the following preparations:

  • Program-controlled insulation withstand voltage tester MS2675P-Ⅰ/Ⅱ
  • Insulation resistance tester MS2675D-Ⅱ
  • Program-controlled withstand voltage tester MS2670P-Ⅱ
  • DG8 megohmmeter/digital insulation resistance tester
  • Digital Insulation Resistance Tester/Megohmmeter DG7
  • Pointer Insulation Resistance Tester DM1008S
  • DM508S Pointer Type Insulation Resistance Tester
  • 10kV Insulation Resistance Tester MIT1020
  • MIT1020/2 Insulation Resistance Tester
    Digital Insulation Resistance Meter (Megohmmeter) CENTER360
  • MIT510 5kV Insulation Resistance Tester
  • PDM508S Pointer Insulation Resistance Tester
  • DG6 Digital Insulation Resistance Tester
  • MS2670P-I Programmable Hipot Tester
     (1) Before measuring, the power supply of the device under test must be cut off and the device must be short-circuited to the ground for discharge. Never allow the device to be energized for measurement to ensure the safety of personnel and equipment.
     (2) For devices that may induce high voltage electricity, this possibility must be eliminated before measurement can be carried out.
     (3) The surface of the object under test must be clean to reduce contact resistance and ensure the accuracy of the measurement results.
     (4) Before measuring, check whether the megohmmeter is in normal working condition, mainly check its "0" and "∞" points. That is, shake the handle to make the motor reach the rated speed. The megohmmeter should point to the "0" position when short-circuited and the "∞" position when open-circuited.
     (5) When using the megohmmeter, it should be placed in a stable and firm place, away from large external current conductors and external magnetic fields.
      After completing the above preparations, you can measure. When measuring, you must also pay attention to the correct wiring of the megohmmeter, otherwise it will cause unnecessary errors or even mistakes.  
Reference address:Correct Method for Measuring Insulation Resistance

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