The Megger technical library provides access to a range of additional content and resources such as technical guides, application notes and more. As with delta motors, the manufacturer’s nameplate for wye connected 9-lead motors explains how the leads should be connected. Megger can provide advice to help you make specific tests. The megger test is checking the condition of the ground wall insulation of the motor. WB82- I work in a power plant of a large utility company. ©2010 Megger . The windings of the motor are classified as Red (R), blue (B), and Yellow (Y), and body (in the absence of neutral) or neutral (N). For a three phase motor, insulation resistance is usually measured between each motor winding or phase and between each motor phase and motor frame (earth) using an insulation tester or megger. Guide to Low Voltage Motor Testing Published: 3 October 2019. Applications of Megger Most, if not all our motors only have 3 leads coming out of the connection box. Guide to Low Voltage Motor Testing. Set the voltage setting of the insulation resistance tester to 500V. Therefore before installing any motor, its insulation resistance should be checked, which should not be less than one mega-ohm per KV with a minimum of one mega-ohm when the machine is cold. Guide to low voltage motor testing 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Place one of the Megger leads on the end of either of the wires, and place the other Megger lead anywhere on the motor's housing to evaluate grounding continuity. Submersible Motor Megger Testing Meggers, or Megohmeters, are often used by service personnel or sophisticated end users as an immediate trouble shooting device. Unfortunately, Megger results are not appropriate for use as a pass/fail determination due … We would be pleased to have a representative call on you to discuss your application. A reading between 20 to 30 megohms indicates that the circuit and the motor … The following figure gives an idea of how the probes of a megger … The reporting device that is additionally meant to create and render reports in the Web will consistently be there to build the reports that you requirement for your framework. The following steps are involved in the process of testing the IR value of the winding of a motor. The following table provides a typical example: L1 L2 L3 Join Low Voltage 1,7 2,8 3,9 4&5&6 High Voltage 1 2 3 4&7, 5&8, 6&9 In this case, high-voltage connections are the same as for delta motors. If the insulation resistance is less, the motor should be dried out before full voltage is applied to it. ... Download PDF. Typically we megger motor just one phase of the motor to ground as the phases are all connected inside the motor. Step 4 Turn the Megger handle and read the meter. 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