GE L30 Instruction Manual page 303

Line current differential system ur series
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5 SETTINGS
5.6 GROUPED ELEMENTS
For the current differential element to function properly, it is imperative that all L30 devices on the protected line
have exactly identical firmware revisions. For example, revision 5.62 in only compatible with 5.62, not 5.61 or 5.63.
NOTE
5
GE Multilin
L30 Line Current Differential System
5-163

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