GE L60 Instruction Manual page 268

Line phase comparison system, ur series
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5.5 GROUPED ELEMENTS
j) OPEN BREAKER ECHO

PATH: SETTINGS
GROUPED ELEMENTS
 OPEN BREAKER
 ECHO
5
As operation of the permissive tripping mode of phase comparison protection and tripping of the line is fundamentally
dependent on transmitting the signal to the remote end of the line, some cases of system operating conditions require
attention:
1.
If a line is open at one end, the phase comparison element is unable to detect an internal fault and give trip permission
to the remote terminal relay.
2.
A weak-infeed or no fault infeed at one end of the faulted line may prevent phase comparison element trip. Conse-
quently, instant conversion from weak-infeed logic with sending permissive continuous signal to fault logic with sending
square waves is required in case of the external fault at the adjacent or internal fault for proper operation of phase
comparison relay at the remote line's terminal.
The open breaker echo element should be applied to any particular application according to local system conditions. The
element settings are described below:
OPEN BREAKER KEYING: Disables/enables the open breaker keying feature.
BRK 1 AUX CONTACT: Assigns a FlexLogic™ operand to control open/close state of breaker 1 with either 52a or 52b
type contact to create logic "1" when the breaker is open.
BRK 1 CONT SUPV: Selects a supervising element such as a test/normal switch usually used in breaker 1 control
schemes or any other elements. If no element is required, the default value "Off" should be used.
BRK 2 AUX CONTACT: If supervision of two breakers is required, this setting is used to assign a FlexLogic™ operand
to control open/close state of the Breaker #2 with either 52a or 52b type contact to create logic "1" when the breaker is
open.
BRK 2 CONT SUPV: Selects a supervising element such as a test/normal switch usually used in breaker 2 control
schemes or any other elements. If no element is required, the default value "Off" should be used.
OPEN BREAKER KEYING PKP DELAY: Delays the operation of open breaker keying to override disagreement
between main and auxiliary contacts of the breaker or any other operating conditions.
5-130
PHASE COMPARISON ELEMENTS
OPEN BREAKER KEYING:
Disabled
BRK 1 AUX CONTACT:
MESSAGE
Off
BRK 1 CONT SUPV:
MESSAGE
Off
BRK 2 AUX CONTACT:
MESSAGE
Off
BRK 2 CONT SUPV:
MESSAGE
Off
OPEN BREAKER KEYING
MESSAGE
PKP DELAY:
OPEN BREAKER KEYING
MESSAGE
RST DELAY:
WEAK-INFEED KEYING:
MESSAGE
Off
WEAK-INFEED SUPV:
MESSAGE
Off
WEAK-INFEED PICKUP
MESSAGE
DELAY:
0.000 s
WEAK-INFEED RESET
MESSAGE
DELAY:
0.035 s
L60 Line Phase Comparison System

OPEN BREAKER ECHO
Range: Disabled, Enabled
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: 0.000 to 50.000 s in steps of 0.001
0.000 s
Range: 0.000 to 50.000 s in steps of 0.001
0.000 s
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: 0.000 to 50.000 s in steps of 0.001
Range: 0.000 to 50.000 s in steps of 0.001
5 SETTINGS
GE Multilin

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