GE L30 Instruction Manual page 483

9 APPLICATION OF SETTINGS 9.4 INSTANTANEOUS ELEMENTS
The elements must be treated selectively. If, for example, the phase over or under voltage setting includes margin or time
delay sufficient to accommodate the maximum additional error on re-synchronization, blocking or delay are not needed for
these elements. Similarly, if the phase instantaneous overcurrent setting has sufficient margin, blocking is not needed. Note
that significant zero-sequence and negative-sequence current or voltage error do not appear during L30 startup, therefore
all sequence-based elements using these quantities are safe.
For the three-terminal line, the synchronization process is longer and block times need to be three times longer than two-
terminal line block times.
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GE Multilin L30 Line Current Differential System 9-13