GE Multilin L30 Line Current Differential System 9-11
9 APPLICATION OF SETTINGS 9.4 INSTANTANEOUS ELEMENTS
9
Figure 9–4: MAXIMUM ERROR FOR 60 HZ SYSTEM
Not all instantaneous elements have to be blocked during the re-synchronization process. For example, the impedance ele-
ment maximum error is 8.86% at 60 Hz. With a typical margin of 15 percent, this is still well below impedance reach point.
Another example is Phase IOC; typically, these elements have very sufficient margin for the overload conditions and are set
high enough above these conditions. But voltage-based elements can be set quite close to the system nominal voltage or
operating voltage and can require attention.
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