Method for detecting a rotor bar fault
AssigneeABB Schweiz AG
InventorsPedro Rodriguez, Subrat Sahoo
Life of this patent
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Abstract
A rotor bar fault in a rotor of an electrical machine having a plurality of rotor bars and an end ring configured to short circuit the rotor bars. The method includes the steps of measuring a first temperature at a first end ring location, and measuring a second temperature at a second end ring location, the second end ring location being different from the first end ring location. As broken rotor bars cause a non-uniform temperature distribution in the end ring, the detection of rotor bar faults can be based on monitored temperatures at different end ring locations.
Claims8
A method for detecting a rotor bar fault in a rotor of an electrical machine having a plurality of rotor bars and an end ring configured to short circuit the rotor bars, the method comprising the steps of:
- measuring a first temperature at a first end ring location, and measuring a second temperature at a second end ring location, the second end ring location being different from the first end ring location;
- calculating a temperature difference between the first temperature and the second temperature;
- calculating a temperature difference change between the temperature difference at a first time and the temperature difference at a second time;
- and
- using the temperature difference, the temperature difference change, or both to determine that a rotor bar fault is present.
Dependencies are inferred from the claim text.