on-line condition monitoring of motors using ... - AREVA NP Inc.
on-line condition monitoring of motors using ... - AREVA NP Inc.
on-line condition monitoring of motors using ... - AREVA NP Inc.
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ROTOR BAR DEGRADATION<br />
• The pole pass frequency (PPF = slip x no. <strong>of</strong> poles) appears as a sideband in current<br />
• <strong>Inc</strong>rease in the rotor impedance due to high resistance joints or broken bars leads to an<br />
increase in the PPF amplitude<br />
• Difference in amplitudes <strong>of</strong> the <strong>line</strong> frequency & the PPF is an indicati<strong>on</strong> <strong>of</strong> the c<strong>on</strong>diti<strong>on</strong><br />
<strong>of</strong> the rotor<br />
Diagnostic Technologies India Pvt. Ltd.
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