alternating current machines 2
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Learning outcome 2
Motor protection
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Over temperature protection
If the temperature of the insulation is exceeded, it starts to degrade and will eventually fail.
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The most common and effective protection is thermal overload devices.
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Primary resistance starter
TOL device
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NUE046 L/O 2 jh 7/05 5L/O 2.4
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Typical TOL with adjustable settings.
Adjustable electronic protection device with overload, phase failure and asymmetry protection.
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NUE046 L/O 2 jh 7/05 9Insulation damage due to overload in 2 phases.
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Rotor damage due to locked rotor condition.
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Common problems.
• Asymmetry – voltage and phases not correct
• Single phasing - loss of a phase• Overloading• Moisture• Foreign matter in motor –sand etc• Frequency fluctuation• Voltage fluctuation
P 240 section 10.10