GE N60 Instruction Manual page 410

GROUPED ELEMENTS
•
POWER SWING
POWER SWING TMR4 PKP
•
POWER SWING BLOCK
•
POWER SWING UN/BLOCK
subsequently unblocked when a fault occurs after the power swing blocking condition has been established
•
POWER SWING 50DD
operand triggers on faults occurring during power swing conditions. This includes both three-phase and single-pole-
open conditions.
•
POWER SWING INCOMING
characteristic)
•
POWER SWING OUTGOING
characteristic). This operand can be used to count unstable swings and take certain action only after a pre-defined
number of unstable power swings.
•
POWER SWING TRIP
The settings for the power swing detect element are as follows.
POWER SWING FUNCTION
both power swing blocking and out-of-step tripping functions.
POWER SWING SOURCE
POWER SWING SHAPE
characteristics of the power swing detect element. The operating principle is not affected. The "Mho" characteristics use
the left and right blinders.
POWER SWING MODE
5
power swing blocking and out-of-step tripping functions. The three-step mode applies if there is enough space between
the maximum load impedances and distance characteristics of the relay that all three (outer, middle, and inner)
characteristics can be placed between the load and the distance characteristics. Whether the spans between the outer
and middle as well as the middle and inner characteristics are sufficient is determined by analysis of the fastest power
swings expected in correlation with settings of the power swing timers.
The two-step mode uses only the outer and inner characteristics for both blocking and tripping functions. This leaves more
space in heavily loaded systems to place two power swing characteristics between the distance characteristics and the
maximum load, but allows for only one determination of the impedance trajectory.
POWER SWING SUPV
supervision responds to the positive-sequence current.
POWER SW I2 SUPV ENAB
detect the presence of significant unbalance in current signals, such as during fault conditions. Under these conditions, the
POWER SWING BLOCK
POWER SWING I2 SUPV
POWER SWING FWD REACH
quadrilateral characteristic. For a simple system consisting of a line and two equivalent sources, this reach needs to be
higher than the sum of the line and remote source positive-sequence impedances. Detailed transient stability studies can
be needed for complex systems in order to determine this setting. The angle of this reach impedance is specified by the
POWER SWING FWD RCA
POWER SWING QUAD FWD REACH MID
The angle of this reach impedance is specified by the
setting is "Mho."
POWER SWING QUAD FWD REACH OUT
The angle of this reach impedance is specified by the
setting is "Mho."
POWER SWING FWD RCA
angles of all blinders, and both forward and reverse reach impedances of the quadrilateral characteristics.
5-216
OUTER, POWER SWING MIDDLE, POWER SWING
are auxiliary operands that facilitate testing and special applications
blocks selected protection elements, such as distance functions
blocks those protection elements that are intended to be blocked under power swings, but
indicates that an adaptive disturbance detector integrated with the element has picked up. This
indicates an unstable power swing with an incoming locus (the locus enters the inner
indicates an unstable power swing with an outgoing locus (the locus leaving the outer
is a trip command
— This setting enables and disables the power swing detection element. The setting applies to
— The source setting identifies the signal source for both blocking and tripping functions.
— This setting selects the shapes (either "Mho" or "Quad") of the outer, middle, and inner
— This setting selects between the two-step and three-step operating modes and applies it to both
— A common overcurrent pickup level supervises all three power swing characteristics. The
— This setting is to enable I2 supervision logic through a FlexLogic operand, which is used to
operand is not asserted.
— This setting specifies the threshold of the I2 supervision logic.
— This setting specifies the forward reach of all three mho characteristics and the inner
setting.
— This setting specifies the forward reach of the middle quadrilateral characteristic.
— This setting specifies the forward reach of the outer quadrilateral characteristic.
— This setting specifies the angle of the forward reach impedance for the mho characteristics,
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
INNER, POWER SWING TMR2
setting. The setting is not used if the shape
POWER SWING FWD RCA
setting. The setting is not used if the shape
POWER SWING FWD RCA
CHAPTER 5: SETTINGS
PKP, and
PKP, POWER SWING TMR3