GE N60 Instruction Manual page 406

CONTROL ELEMENTS
SYNCHK1 MAX VOLT DIFF
voltage magnitude difference between the two input voltages below this value is within the permissible limit for
synchronism.
SYNCHK1 MAX ANGLE DIFF
difference between the two input voltage phasors below this value is within the permissible limit for synchronism.
SYNCHK1 MAX FREQ HYSTERESIS
condition becomes satisfied when the frequency difference becomes lower than
Synchrocheck element has operated, the frequency difference must increase above the
MAX FREQ HYSTERESIS
SYNCHK1 SYNC CLOSE
V2 vector will be arriving to synchronize (shown as V2' in the figures here) with breaker close time being taken into account
will be predicted based on the measured slip frequency so that breaker close command can be issued in advance to
ensure the synchronism at the time when the breaker is actually closed.
5
SYNCHK1 S-CLS MAX dF
disarmed when the slip frequency exceeds this setting.
SYNCHK1 S-CLS MIN dF
disarmed when the slip frequency drops below this setting.
SYNCHK1 S-CLS BRK TIME
SYNCHK1 V2 MAG CORR FACTOR
magnitude compensation so that V2 magnitude can be directly compared with V1 magnitude. For example, when V1 and
V2 are taken from 2 different windings of the transformer and at different voltage levels, the magnitude compensation
must be performed before starting magnitude comparison in synchrocheck element.
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— Selects the maximum primary voltage difference in volts between the two sources. A primary
— Selects the maximum angular difference in degrees between the two sources. An angular
— Specifies the required hysteresis for the maximum frequency difference condition. The
sum to drop out (assuming the other two conditions, voltage and angle, remain satisfied).
— Enables the dynamic mode of synchrocheck. When it is enabled, the location of where the present
Figure 5-132: Synchrocheck plot for slip > 0 (slip = F2-F1)
Figure 5-133: Synchrocheck plot for slip < 0 (slip = F2-F1)
— Specifies the maximum slip frequency allowed in Hz in the dynamic mode. The dynamic mode is
— Specifies the minimum slip frequency allowed in Hz in the dynamic mode. The dynamic mode is
— Specifies the breaker closing time in seconds.
— Specifies the magnitude correction factor of source V2. This setting is used for V2
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
. Once the
SYNCHK1 MAX FREQ DIFF
SYNCHK1 MAX FREQ DIFF + SYNCHK1