GE UR series, Инструкция по эксплуатации

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GE Multilin L60 Line Phase Comparison System 5-123
5 SETTINGS 5.5 GROUPED ELEMENTS
5
1. For a two-terminal line:
2. For a three-terminal line:
Charging current compensation calculations should be performed for an arrangement where the VTs are con-
nected to the line side of the circuit; otherwise, opening the breaker at one end of the line will cause a calcula-
tion error. The calculated charging current per line terminal is recorded in oscillography per each phase.
j) OPEN BREAKER ECHO
PATH: SETTINGS
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GROUPED ELEMENTS
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PHASE COMPARISON ELEMENTS
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OPEN BREAKER ECHO
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.
„
OPEN BREAKER
„
ECHO
OPEN BREAKER KEYING:
Disabled
Range: Disabled, Enabled
MESSAGE
BRK 1 AUX CONTACT:
Off
Range: FlexLogic™ operand
MESSAGE
BRK 1 CONT SUPV:
Off
Range: FlexLogic™ operand
MESSAGE
BRK 2 AUX CONTACT:
Off
Range: FlexLogic™ operand
MESSAGE
BRK 2 CONT SUPV:
Off
Range: FlexLogic™ operand
MESSAGE
OPEN BREAKER KEYING
PKP DELAY: 0.000 s
Range: 0.000 to 50.000 s in steps of 0.001
MESSAGE
OPEN BREAKER KEYING
RST DELAY: 0.000 s
Range: 0.000 to 50.000 s in steps of 0.001
MESSAGE
WEAK-INFEED KEYING:
Off
Range: FlexLogic™ operand
MESSAGE
WEAK-INFEED SUPV:
Off
Range: FlexLogic™ operand
MESSAGE
WEAK-INFEED PICKUP
DELAY: 0.000 s
Range: 0.000 to 50.000 s in steps of 0.001
MESSAGE
WEAK-INFEED RESET
DELAY: 0.035 s
Range: 0.000 to 50.000 s in steps of 0.001
X
react_n
1
1
X
react_n_terminal1
----------------------------------------
1
X
react_n_terminal2
---------------------------------------- +
⎝ ⎠
⎛ ⎞
⁄
=
X
react_n
1
1
X
react_n_terminal1
----------------------------------------
1
X
react__n_terminal2
------------------------------------------
1
X
react_n_terminal3
---------------------------------------- + +
⎝ ⎠
⎛ ⎞
⁄
=
NOTE