17BEE0029_VL2019201007349_AST04.docx - Name SURABHI RAMAN...

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Name : SURABHI RAMAN Reg No: : 17BEE0029 Exp. 4 – Measurement of Insulation Resistance Withstand of Motors Aim : To measure the Insulation Resistance withstand of cable and understand the acceptance criteria for a healthy insulation of cables Need for Insulation Resistance (IR) test & factors influencing insulation deterioration : Harsh installation environments, especially those with temperature extremes and/or chemical contamination, accelerate the process of degradation of insulation system that protects the current carrying conductor of the equipment. Some of the major factors that can influence the process of degradation of insulation include: Electrical stresses: Mainly linked to overvoltage Mechanical stresses: Frequent start-up & shutdown sequences can cause mechanical stresses. Balancing problems on rotating machinery and any direct stress to the cables and the installations in general (called “chafing”) Chemical stresses: The proximity of chemicals, oils, corrosive vapours and dust, in general, affects the insulation performance of the materials. Stresses linked to temperature variations: When combined with the mechanical stresses caused
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