GE D60 Instruction Manual page 401

CHAPTER 5: SETTINGS
POWER SWING INNER LIMIT ANGLE
characteristic is used by the out-of-step tripping function: beyond the inner characteristic out-of-step trip action is definite
(the actual trip can be delayed as per the
power swing angle beyond which the system becomes unstable and cannot recover.
The inner characteristic is also used by the power swing blocking function in the two-step mode. In this case, set this angle
large enough so that the characteristics of the distance elements are safely enclosed by the inner characteristic. This
setting applies to mho shapes only.
,
POWER SWING OUTER MIDDLE
blinder applies to both "Mho" and "Quad" characteristics. Set these value high if no blinder is required for the "Mho"
characteristic.
,
POWER SWING OUTER MIDDLE
positive value; the relay automatically uses a negative value. The blinder applies to both "Mho" and "Quad" characteristics.
Set this value high if no blinder is required for the "Mho" characteristic.
POWER SWING PICKUP DELAY 1
fastest expected power swing and produce out-of-step tripping in a secure manner. Set the timers in relation to the power
swing detect characteristics, mode of power swing detect operation, and mode of out-of-step tripping. This timer defines
the interval that the impedance locus must spend between the outer and inner characteristics (two-step operating mode),
or between the outer and middle characteristics (three-step operating mode) before the power swing blocking signal is
established. This time delay must be set shorter than the time required for the impedance locus to travel between the two
selected characteristics during the fastest expected power swing. This setting is relevant for both power swing blocking
and out-of-step tripping.
— This setting defines the dropout delay for the power swing blocking signal. Detection of a
POWER SWING RESET DELAY 1
condition requiring a block output sets latch 1 after
characteristic, timer
POWER SWING RESET DELAY 1
to give extra security for the power swing blocking action.
POWER SWING PICKUP DELAY 2
the interval the impedance locus must spend between the middle and inner characteristics before the second step of the
out-of-step tripping sequence is completed. This time delay must be set shorter than the time required for the impedance
locus to travel between the two characteristics during the fastest expected power swing.
POWER SWING PICKUP DELAY 3
must spend within the inner characteristic before the last step of the out-of-step tripping sequence is completed and the
element is armed to trip. The actual moment of tripping is controlled by the
for extra security before the out-of-step trip action is executed.
POWER SWING PICKUP DELAY 4
the interval the impedance locus must spend outside the inner characteristic but within the outer characteristic before the
element is armed for the delayed trip. The delayed trip occurs when the impedance leaves the outer characteristic. This
time delay is provided for extra security. Set it considering the fastest expected power swing.
— The out-of-step trip FlexLogic operand
POWER SWING SEAL-IN DELAY
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.
— Selection of the "Early" trip mode results in an instantaneous trip after the last step in the out-
POWER SWING TRIP MODE
of-step tripping sequence is completed. The early trip mode stresses 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
relaxes the operating conditions for the breakers as the currents at that moment are low. Make the selection considering
the capability of the breakers in the system.
— This setting specifies the FlexLogic operand used for blocking the out-of-step function only. The
POWER SWING BLK
power swing blocking function is operational all the time as long as the element is enabled. The blocking signal resets the
output operand but does not stop the out-of-step tripping sequence.
POWER SWING TRIP
— Enables and disables the logging of power swing detect events in the sequence of events
POWER SWING EVENTS
recorder.
D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
— This setting defines the inner power swing detect characteristic. The inner
setting). Therefore, this angle must be selected in consideration to the
TRIP MODE
, and — These settings specify the resistive reach of the right blinder. The
INNER RGT BLD
, and — These settings specify the resistive reach of the left blinder. Enter a
INNER LFT BLD
— All the coordinating timers are related to each other and need to be set to detect the
PICKUP DELAY 1
is started. When the timer times-out, the latch is reset. Select this setting
— Controls the out-of-step tripping function in the three-step mode only. This timer defines
— Controls the out-of-step tripping function only. It defines the interval the impedance locus
— Controls the out-of-step tripping function in "Delayed" trip mode only. This timer defines
time. When the impedance locus leaves the outer
setting. This time delay is provided
TRIP MODE
(POWER SWING TRIP) is sealed-in for the specified
GROUPED ELEMENTS
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