GE L90 Instruction Manual page 588
Line current differential system
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- Instruction manual (832 pages) ,
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- Instruction manual (700 pages)
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CONTROL ELEMENTS
The continuous monitor logic is used 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 disturbance
detector function, no trip is issued under these conditions. This can occur when an element is incorrectly set so that it can
misoperate under load. The continuous monitor can detect this state and issue an alarm and/or block the tripping of the
relay.
5
5.8.11.6 CT failure detector
SETTINGS CONTROL ELEMENTS MONITORING ELEMENTS CT FAILURE DETECTOR 1(2 or 4)
CT FAILURE
DETECTOR 1
5-364
Figure 5-208: Continuous monitor logic
CT FAIL 1 FUNCTION:
Disabled
CT FAIL 1 BLOCK:
Off
CT FAIL 1 3I0 INP 1:
SRC 1
CT FAIL 1 3I0 INP 1
PKP: 0.2 pu
CT FAIL 1 3I0 INP 2:
SRC 2
CT FAIL 1 3I0 INP 2
PKP: 0.2 pu
CT FAIL 1 3V0 INPUT:
SRC 1
CT FAIL 1 3V0 INPUT
PKP: 0.20 pu
Range: Disabled, Enabled
Range: FlexLogic operand
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.1 to 2.0 pu in steps of 0.1
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.1 to 2.0 pu in steps of 0.1
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.04 to 2.00 pu in steps of 0.01
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
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