5-314 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS CHAPTER 5: SETTINGS
5
The following settings are available.
COMPENSATED OV Zc MAG — This setting specifies the magnitude of the impedance Z
C
in secondary ohms. Set it to half the
positive-sequence series impedance of the line. Alternately, if the positive-sequence charging currents and local and
remote voltages are known, then this value can be calculated from equation above.
COMPENSATED OV Zc ANG — This setting specifies the angle of the impedance Z
C
in degrees.
COMPENSATED OV I_1max — This setting specifies the maximum expected positive-sequence line current for which a
remote overvoltage is anticipated.
COMPENSATED OV STG1 PKP, COMPENSATED OV STG2 PKP, COMPENSATED OV STG3 PKP — These settings specify the pickup level
for each of the three stages. If any stage is set with no intentional time delay, then set the pickup setting 15% above the
anticipated steady state overvoltage to prevent an operation during line energization. A stage that is not used can be set
to its maximum setting value (3.000 pu) to effectively disable it.
COMPENSATED OV STG1 DELAY, COMPENSATED OV STG2 DELAY, COMPENSATED OV STG3 DELAY — These settings specify the time
delay for each of the three stages in seconds.
Figure 5-179: Compensated overvoltage logic
5.7.15 Supervising elements
5.7.15.1 Menu
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) SUPERVISING ELEMENTS
SUPERVISING
ELEMENTS
DISTURBANCE
DETECTOR
See below
87L TRIP
See page 5-318
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