452 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
AUTOMATION CONTROL CHAPTER 8: AUTOMATION
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables the synchrocheck position indications and control logic. If disabled,
all synchrocheck outputs and front panel indications are switched off.
Block
Range: any automation logic operand or shared operand
Default: BKR1 CLOSED
Assertion of the operand assigned to this setting blocks operation of the synchrocheck
element.
V1 Source
Range: LINE (SRC 1), BKR 1 (SRC 2), BKR 2 (SRC 3)
Default: LINE (SRC 1)
This setting selects the source for the V
1
voltage.
V2 Source
Range: LINE (SRC 1), BKR 1 (SRC 2), BKR 2 (SRC 3)
Default: BKR 1 (SRC 2)
This setting selects the source for the V
2
voltage.
Maximum Voltage Difference
Range: 0 to 400000 volts in steps of 1
Default: 10000 volts
This setting specifies the maximum primary voltage difference (in volts) between the two
sources. A primary voltage magnitude difference between the two input voltages less
than this value is within the permissible limit for synchronism.
Maximum Angle Difference
Range: 0 to 100° in steps of 1
Default: 30°
This setting specifies the maximum angular difference (in degrees) between the two
sources. An angular difference between the two input voltage phasors less than this
value is within the permissible limit for synchronism.
Maximum Frequency Difference
Range: 0.00 to 2.00 Hz in steps of 0.01
Default: 1.00 Hz
This setting selects the maximum frequency difference (in hertz) between the two
sources. A frequency difference between the two input voltage systems below this value
is within the permissible limit for synchronism.
Frequency Hysteresis
Range: 0.00 to 0.10 Hz in steps of 0.01
Default: 0.06 Hz
This setting specifies the required hysteresis for the maximum frequency difference
condition. The condition becomes satisfied when the frequency difference is less than
the value specified by the
Maximum Frequency Difference setting. Once the
synchrocheck element has operated, the frequency difference must increase above the
sum of this setting and the Maximum Frequency Difference setting to drop out
(assuming the other two conditions, voltage and angle, remain satisfied).
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