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N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
•
Two-step operation
— Similar to the three-step mode with two exceptions. First, the initial stage monitors the time
spent by the impedance locus between the outer and inner characteristics. Second, the stage involving the
POWER
SWING PICKUP DELAY 2
timer is bypassed. It is up to the user to integrate the blocking (
POWER SWING BLOCK
) and tripping
(
POWER SWING TRIP
) FlexLogic operands with other protection functions and output contacts in order to make this
element fully operational.
The element can be set to use either lens (mho) or rectangular (quadrilateral) characteristics, as shown in the figure. When
set to “Mho,” the element applies the right and left blinders as well. If the blinders are not required, set their settings high
enough to effectively disable the blinders.
Figure 5-112: Power swing detect mho operating characteristics