GE L90 Instruction Manual page 374

5.7 CONTROL ELEMENTS
The continuous monitor logic is intended to detect the operation of any tripping element that has operated under normal
load conditions; that is, when the disturbance detector has not operated. Because all tripping is supervised by the distur-
bance detector function, no trip will be issued under these conditions. This could occur when an element is incorrectly set
so that it may misoperate under load. The continuous monitor can detect this state and issue an alarm and/or block the trip-
ping of the relay.
ETT NG
CONT MONITOR
FUNCTION:
Disabled = 0
Enabled = 1
ETT NG
CONT MONITOR
I_SUPV:
Off = 0
ETT NG
CONT MONITOR
I_OP:
Off = 0
ETT NG
CONT MONITOR
V_SUPV:
Off = 0
5
ETT NG
CONT MONITOR
V_OP:
Off = 0
5-238
AND
AND
AND
AND
Figure 5–132: CONTINUOUS MONITOR SCHEME LOGIC
L90 Line Current Differential System
CON TANT
CONT
MONITOR
TIMER
OR
t = 1 sec
pkp
t = 0
RST
FLEXLOG C OPE AND
CONT MONITOR OP
CONT MONITOR PKP
CONT MONITOR DPO
5 SETTINGS
827049A3.vsd
GE Multilin