A motor winding resistance test is performed using what type of instrument?

A motor winding resistance test is performed using what type of instrument?

• A. Ohmmeter
• B. Multimeter
• C. Megger
• D. Wattmeter

Answer: (C)

In conducting a motor winding resistance test, a Megger is specifically designed to measure insulation resistance, making it an appropriate choice for assessing the resistance in motor windings. A Megger applies a high voltage to the winding and measures the resulting leakage current, which helps in determining the insulation quality and resistance. This is crucial for ensuring the motor operates safely and efficiently, as poor insulation can lead to motor failure or electrical hazards. While an ohmmeter and a multimeter can measure lower resistance values, they primarily test at lower voltages and might not effectively identify issues with insulation breakdown. A wattmeter measures electrical power in a circuit and does not provide resistance measurements. Thus, the Megger's ability to deliver a high voltage and assess insulation integrity makes it the ideal instrument for this specific type of testing.

In conducting a motor winding resistance test, a Megger is specifically designed to measure insulation resistance, making it an appropriate choice for assessing the resistance in motor windings. A Megger applies a high voltage to the winding and measures the resulting leakage current, which helps in determining the insulation quality and resistance. This is crucial for ensuring the motor operates safely and efficiently, as poor insulation can lead to motor failure or electrical hazards.

While an ohmmeter and a multimeter can measure lower resistance values, they primarily test at lower voltages and might not effectively identify issues with insulation breakdown. A wattmeter measures electrical power in a circuit and does not provide resistance measurements. Thus, the Megger's ability to deliver a high voltage and assess insulation integrity makes it the ideal instrument for this specific type of testing.