GE L60 Instruction Manual page 285

5 SETTINGS
• OPEN BREAKER KEYING RST DELAY: Delays the reset of open breaker keying to override disagreement between
main and auxiliary contacts of the breaker or any other operating conditions.
• WEAK-INFEED KEYING: This setting assigns a sensitive phase-current element for weak-infeed keying control. It
should be normally picked up with a minimum line load current. An instantaneous overcurrent element or a group of
overcurrent elements are suitable for this purpose.
• WEAK-INFEED SUPV: This setting selects a weak-infeed supervising element from FlexLogic operands. An under-
voltage element, auxiliary contacts of breakers indicating close position, or other elements can be useful for no-current
supervision.
• WEAK-INFEED PICKUP DELAY: This setting delays operation of weak-infeed keying during some transient condi-
tions (such as breaker reclosure, etc.).
• WEAK-INFEED RESET DELAY: The weak-infeed keying function incorporates a default 35 ms reset delay to assure
reset coordination with the FDH trip-level fault detector at the remote terminal during fault clearing. The default reset
time can be changed according to local conditions.
GE Multilin
Figure 5–59: OPEN BREAKER ECHO SCHEME LOGIC
L60 Line Phase Comparison System
5.5 GROUPED ELEMENTS
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