How to control the measurement error of high-voltage motor test

The control of measurement errors in high-voltage motor tests is mainly achieved through the following methods: instrument selection and accuracy control, wiring optimization, current and temperature rise control. Through these measures, the systematic and random errors in high-voltage motor resistance measurement can be effectively reduced, ensuring the reliability of test results.

The control of measurement errors in high-voltage motor testing is mainly achieved through the following methods:

Instrument selection and precision control
Low voltage motor: Use a multimeter (accuracy ± 1%~± 5%) or a DC double arm bridge (accuracy ± 0.1%~± 0.01%) for measurement. The double arm bridge is suitable for precision measurement, while the multimeter is suitable for daily inspection.
High voltage motor: using a dedicated DC resistance tester (such as a micro ohmmeter), supporting high current output (1A~100A), with an accuracy of less than ± 0.1%, ensuring the accuracy of low resistance measurement.

Optimization of wiring method
The lead wires of high-voltage motor windings are mostly multi strand soft copper wires or cables, and a four wire connection method is required: two current wires clamp the root of the lead wires, and two voltage wires are connected in parallel on the inside of the current wires to reduce the interference of lead resistance and contact resistance on the measurement results.

Current and temperature rise control
High voltage motor: Due to the small winding resistance, the test current needs to be strictly controlled below 10A to avoid significant temperature rise in the winding caused by Joule heating, which may affect measurement accuracy. The specific current value needs to be selected based on the winding resistance parameters.

Through the above measures, the systematic and random errors in measuring the resistance of high-voltage motors can be effectively reduced, ensuring the reliability of the test results.

Key words:

High Voltage Motor,low-voltage motor,motor winding,electrical machinery,motor test

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