Monitoring Elements - GE G30 Instruction Manual

5.7 CONTROL ELEMENTS
1. Zero-sequence current at different source current (may be different set of CTs or different CT core of the same CT).
2. Zero-sequence voltage at the assigned source.
3. Appropriate protection element or remote signal.
The CT failure settings are described below.
• CT FAIL FUNCTION: This setting enables or disables operation of the CT failure element.
• CT FAIL BLOCK: This setting selects a FlexLogic operand to block operation of the element during some condition
(for example, an open pole in process of the single pole tripping-reclosing) when CT fail should be blocked. Local sig-
nals or remote signals representing operation of some remote current protection elements via communication chan-
nels can also be chosen.
• CT FAIL 3I0 INPUT 1: This setting selects the current source for input 1. The most critical protection element should
also be assigned to the same source.
• CT FAIL 3I0 INPUT 1 PICKUP: This setting selects the 3I_0 pickup value for input 1 (the main supervised CT source).
• CT FAIL 3I0 INPUT 2: This setting selects the current source for input 2. Input 2 should use a different set of CTs or a
different CT core of the same CT. If 3I_0 does not exist at source 2, then a CT failure is declared.
• CT FAIL 3I0 INPUT 2 PICKUP: This setting selects the 3I_0 pickup value for input 2 (different CT input) of the relay.
• CT FAIL 3V0 INPUT: This setting selects the voltage source.
• CT FAIL 3V0 INPUT PICKUP: This setting specifies the pickup value for the 3V_0 source.
• CT FAIL PICKUP DELAY: This setting specifies the pickup delay of the CT failure element.
5
SETTING
CT FAIL FUNCTION:
Disabled=0
Enabled=1
SETTING
CT FAIL BLOCK:
Off=0
SETTING
CT FAIL 3IO INPUT1:
SRC1
SETTING
CT FAIL 3IO INPUT2:
SRC2
SETTING
CT FAIL 3VO INPUT:
SRC1
c) VT FUSE FAILURE

PATH: SETTINGS CONTROL ELEMENTS
 VT FUSE FAILURE 1

5-220
SETTING
CT FAIL 3IO INPUT1 PKP:
RUN 3IO > PICKUP
SETTING
CT FAIL 3IO INPUT2 PKP:
RUN 3IO > PICKUP
SETTING
OR
CT FAIL 3VO INPUT:
RUN 3VO > PICKUP
Figure 5–110: CT FAILURE DETECTOR SCHEME LOGIC


MONITORING ELEMENTS

VT FUSE FAILURE 1
FUNCTION: Disabled
G30 Generator Protection System
SETTING
CT FAIL PICKUP DELAY:
FLEXLOGIC OPERANDS
AND
0
CT FAIL OP
CT FAIL PKP

VT FUSE FAILURE 1(4)
Range: Disabled, Enabled
5 SETTINGS
827048A6.CDR
GE Multilin