Supervising Elements - GE L90 Instruction Manual

GROUPED ELEMENTS
The following settings are available.
COMPENSATED OV Zc MAG
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
COMPENSATED OV I_1max
remote overvoltage is anticipated.
COMPENSATED OV STG1 PKP
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
delay for each of the three stages in seconds.
5

5.7.15 Supervising elements

5.7.15.1 Menu
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  SUPERVISING ELEMENTS
 SUPERVISING
 ELEMENTS
5-314
— This setting specifies the magnitude of the impedance Z
— This setting specifies the angle of the impedance Z
— This setting specifies the maximum expected positive-sequence line current for which a
, ,
COMPENSATED OV STG2 PKP
,
COMPENSATED OV STG2 DELAY
Figure 5-179: Compensated overvoltage logic
 DISTURBANCE

 DETECTOR
 87L TRIP


in degrees.
C
— These settings specify the pickup level
COMPENSATED OV STG3 PKP
,
COMPENSATED OV STG3 DELAY
See below
See page 5-318
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
in secondary ohms. Set it to half the
C
— These settings specify the time