Absorption ratio refers to the absorption ratio of 2500 ΩMeggerMeasured for 60sinsulation resistance The ratio of the value to the insulation resistance value at 15s.
Absorption ratio refers tomeasuring equipment The ratio of insulation resistance between 60s and 15s when insulation to ground is appliedDC voltageDifferent time lengths have different effects on equipment humidity and other conditions, so comparing the ratio of two times can determine whether the equipment is affected by humidityinsulation resistance , absorption ratio when insulation is dampminimum valueIs 1, and the absorption ratio is greater than 1 when drying.Absorption ratio test, usually used forcapacitanceLarge amount of electrical equipment.The absorption ratio should be consistent with theSpecific environmentConsider in combination.
The purpose of measuring the absorption ratio is to find that the insulation is affected with moisture.The absorption ratio can not only reflect the insulation moisture, but also reflect the overall and local defects.
Relevant regulations
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Standard for Hand over Test of Electrical Equipment in Electrical Equipment Installation EngineeringAC motorMandatory provisions for experimental projects.
After transformer overhaulElectrical testOne of the items is measurementwindingInsulation resistance and absorption ratio.
The Regulations on Handover and Preventive Test of Electric Equipment of State Grid Shandong Electric Power Group Company 2007 stipulates that the absorption ratio is not less than 1.3 at room temperature;When R60s (resistance at 60s) is greater than 3000M Ω, the absorption ratio can be exempted from assessment requirements.
The absorption ratio Km is the ratio of the measured value RM60s when the test voltage is applied for 60s to the measured value RM15s when the insulation resistance is measured.The value greater than 1.3 or 1.2 is qualified——Motor Experiment Technology and Equipment Manual
