GE D30 Instruction Manual page 264

5.6 GROUPED ELEMENTS
• POWER SWING SEAL-IN DELAY: The out-of-step trip FlexLogic™ operand (
specified period of time. The sealing-in is crucial in the delayed trip mode, as the original trip signal is a very short
pulse occurring when the impedance locus leaves the outer characteristic after the out-of-step sequence is completed.
• POWER SWING TRIP MODE: Selection of the "Early" trip mode results in an instantaneous trip after the last step in
the out-of-step tripping sequence is completed. The early trip mode will stress the circuit breakers as the currents at
that moment are high (the electromotive forces of the two equivalent systems are approximately 180° apart). Selection
of the "Delayed" trip mode results in a trip at the moment when the impedance locus leaves the outer characteristic.
delayed trip mode will relax the operating conditions for the breakers as the currents at that moment are low. The
selection should be made considering the capability of the breakers in the system.
• POWER SWING BLK: This setting specifies the FlexLogic™ operand used for blocking the out-of-step function only.
The power swing blocking function is operational all the time as long as the element is enabled. The blocking signal
resets the output
POWER SWING TRIP
SETTING
POWER SWING
FUNCTION:
5
Disabled = 0
Enabled = 1
SETTING
POWER SWING SOURCE:
V_1
_1
ETT NG
POWER SWING FUNCTION:
Disabled = 0
Enabled = 1
ETT NG
POWER SWING SOURCE:
I_0
I_1
I_2
5-132
operand but does not stop the out-of-step tripping sequence.
SETTINGS
POWER SWING
SHAPE:
POWER SWING FWD
REACH:
POWER SWING QUAD
FWD REACH MID:
POWER SWING QUAD
FWD REACH OUT:
POWER SWING FWD
RCA:
POWER SWING REV
REACH:
POWER SWING QUAD REV
REACH MID:
POWER SWING QUAD REV
REACH OUT:
POWER SWING REV
RCA:
RUN
OUTER IMPEDANCE
REGION
RUN
MIDDLE IMPEDANCE
REGION
RUN
INNER IMPEDANCE
REGION
SETTING
POWER SWING
SUPV:
RUN
_1 > PICKUP
Figure 5–65: POWER SWING DETECT SCHEME LOGIC (1 of 3)
RUN
| |I_0| - |I_0'|| > K_0
| |I_1| - |I_1'|| > K_1
| |I_2| - |I_2'|| > K_2
I_0, I_1, I_2 - present values
I_0', I_1', I_2' - half-a-cycle old values
K_0, K_2 - three times the average change over last power cycle
K_1 - four times the average change over last power cycle
Figure 5–66: POWER SWING DETECT SCHEME LOGIC (2 of 3)
D30 Line Distance Protection System
POWER SWING TRIP
POWER SWING OUTER
LIMIT ANGLE:
POWER SWING MIDDLE
LIMIT ANGLE:
POWER SWING INNER
LIMIT ANGLE:
POWER SWING OUTER
RGT BLD:
POWER SWING OUTER
LFT BLD:
POWER SWING MIDDLE
RGT BLD:
POWER SWING MIDDLE
LFT BLD:
POWER SWING INNER
RGT BLD:
POWER SWING INNER
LFT BLD:
FLEXLOGIC OPERAND
AND POWER SWING OUTER
FLEXLOGIC OPERAND
AND POWER SWING MIDDLE
FLEXLOGIC OPERAND
AND POWER SWING INNER
T ME
0
10 cycles
T ME
0
4 cycles
5 SETTINGS
) is sealed-in for the
827840A3.CDR
FLEXLOG C OPE AND
POWER SWING 50DD
842008A1.CDR
GE Multilin