Motor winding resistance
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The Megger test is also used to find the insulation resistance of the motor. Different factors affect motor insulation as mentioned above. Insulation plays a vital role in electrical equipment i.e. Motor Insulation resistance test using a megger (megger test) Now to guess the result about the motor whether it is ok or not, we must get a higher and nearly equal figure from all winding tests. The process may be repeated for checking phase to phase winding resistance. Now to check the winding resistance we will connect the probe with the motor. Once we start checking it will detect and measure electrical continuity. Therefore, we will place the rotary selector on ohms. Megger’s operation is just like a multimeter. Maximum insulation resistance should be measured with 500 V DC with the windings at a operating temperature of 80 120C depending on the motor type and efficiency. The winding temperature should be 25C 15C. In this process the first step to examine the winding resistance. Minimum insulation resistance of the winding to ground is measured with 500 V DC. Motor windings resistance test using a megger motor windings resistance and Motor Insulation resistance.The process of each test is explained below. Megger a motor to check two different types of resistance i.e. The starting winding is made from the thin wire (SWG) which means that this wire will be high resistance to the other one. Plus, the failure in the megger test may lead to dangerous conditions or the motor may burn due to electrical short circuit. In the single phase motor, the main winding is made from thick wire which means that this winding will me low resistance than starting winding. The magnet tracks can see a variation in magnet strengths of 3-5 from one manufactured lot to the next. 5 ohms between each of the phases and +/-30 for the inductance, similar to rotary servo motor tolerances. The good insulation has high resistance while the poor one has low resistance, This resistance decreases gradually so its important to have inspection schedule, and to make megger test and to have good recording the values of the test for each motor. The Trilogy coils' winding tolerance is a standard +/-10 for the resistance and within. Modern test equipment for this purposes utilizes a Kelvin bridge to achieve results you might think of a winding resistance test set as a very large low-resistance ohmmeter (DLRO). Even if the motor insulation is in very good condition in the beginning of it work life, over time the above mentioned factors effect the insulation resistance making leakage current through the insulation and then may lead to failure. Transformer winding resistance measurements are obtained by passing a known DC current through the winding under test and measuring the voltage drop across each terminal.