5-250 M60 Motor Protection System GE Multilin
5.7 CONTROL ELEMENTS 5 SETTINGS
5
• MAXIMUM CURRENT UNBALANCE: When the current unbalance is greater than the value specified by this setting,
the data acquisition of the broken rotor bar detection function is blocked. The broken rotor bar detection algorithm can-
not accurately determine the broken rotor bar spectral component in a current unbalance situation.
• BROKEN ROTOR BAR PICKUP: This setting specifies the pickup threshold for the broken rotor bar detection feature.
The pickup threshold should normally be set to a level between –54 dB (very likely, a cracked rotor bar) and –50 dB
(probably a broken rotor bar).
• BROKEN ROTOR BAR RESET DLY: This setting specifies a time delay to reset the broken rotor bar detection fea-
ture. This setting can be left at its default value since the element updates its state one to two times per minute.
• BRB BLOCK: This setting selects a FlexLogic operand used to block the broken rotor bar detection feature. Typically,
a panel cut-off switch or other user-specified conditions blocks this function.
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