ABB REL650 series Technical Manual page 130

Section 6
Impedance protection
124
BLOCK
NOT
startPhG
startPhPh
TimerSelZx
internalCommonStart
phSelStart
externalCommonStart
ANSI11000270 V3 EN
Figure 50: Zone tripping logic
• Timers separated - Separate start of timers within zone individually from phase to
ground and phase to phase measurement loops
• Timers linked - Start of timers linked within zone, either phase to ground or phase to
phase will start both timers within zone
• Internal start - Internal common start of timers from all the 5 zones
• Start from PhSel - Common start of timers from phSelLogic Start signal, if direction
condition is forward for the particular phase and also the zone is set for DirModeZx
setting as Forward
• External start - External common start of timers
Switch :
Timers separated
FALSE
³1 Timers linked
Internal start
Start from PhSel
External start
1MRK 506 335-UUS A
operatePhG
tPEZx
&
³1
t
tPPZx
&
³1
t operatePhPh
ANSI11000270-3-en.vsd
Technical manual