GE C70 Instruction Manual page 349

5 SETTINGS
• AVR 1 VOLT LEVEL TO OPEN: In the voltage mode, this setting specifies the voltage level at or above which to issue
the open command. The following figure illustrates voltage control level settings.
CLOSE
OPEN
Figure 5–101: CLOSE AND OPEN LEVELS WHEN CONTROLLING VOLTAGE OR VARS
• AVR 1 VOLT DROP COMPENS Z: In the voltage mode, this setting allows compensating for voltage drop on the line
when the relay measuring point is located upstream of the load. Positive-sequence line impedance is entered in sec-
ondary ohms. Compensation cannot exceed 20% of the nominal phase voltage.
• AVR 1 VOLT DROP COMPENS RCA: In the voltage mode, this setting specifies the angle of the line impedance for
voltage drop calculations.
• AVR 1 VAR LEVEL TO CLOSE: In the "VAR" mode, this setting specifies level for the three-phase reactive power level
at or above which to issue the close command. The 1 pu value is the product of the nominal primary phase-to-phase
voltage, the CT primary, and
the largest CT primary is used to define the 1 pu value for this setting.
• AVR 1 VAR LEVEL TO OPEN: In the "VAR" mode, this setting specifies level for the three-phase reactive power level
at or below which to issue the OPEN command. The 1 pu value is defined as for the
• AVR 1 POWER FACTOR LIMIT: In the "VAR" mode, this setting specifies the power factor below which close com-
mands are allowed. Also affects open commands as shown in the above figure. If set to "1.00", the power factor has no
effect.
• AVR 1 VAR OPEN MODE: Selects the close command characteristic, either "Minimize No. of Ops." (minimize number
of operations) or "Minimize Uptime", as described earlier in the Automatic voltage regulator pickup characteristics in
"VAR" mode diagram.
• AVR 1 DELAY BEFORE CLOSE: This setting specifies delay before issuing the close command, and is used to coor-
dinate with other regulators, or to ride through abnormal system conditions such as faults or re-close sequences.
• AVR 1 DELAY BEFORE OPEN: This setting specifies delay before issuing the open command, and is used to coordi-
nate with other regulators, or to ride through abnormal system conditions such as faults or re-close sequences.
• AVR 1 BLOCK: This setting specifies a dynamic blocking condition. When blocked the element resets its output flags
and internal timers. VT fuse fail is a typical application.
GE Multilin
VOLTAGE
3 . When the source current is an internal summation of two or more CT bank currents,
C70 Capacitor Bank Protection and Control System
5.7 CONTROL ELEMENTS
CLOSE
OPEN
VAR LEVEL TO CLOSE
VARs
834733A1.CDR
setting.
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