GE C70 Instruction Manual page 474

CONTROL ELEMENTS CHAPTER 5: SETTINGS
Figure 5-146: Close and open levels when controlling voltage or VARs
— In the voltage mode, this setting allows compensating for voltage drop on the line when the
AVR 1 VOLT DROP COMPENS Z
relay measuring point is located upstream of the load. Positive-sequence line impedance is entered in secondary ohms.
Compensation cannot exceed 20% of the nominal phase voltage.
— In the voltage mode, this setting specifies the angle of the line impedance for voltage
AVR 1 VOLT DROP COMPENS RCA
drop calculations.
— In the "VAR" mode, this setting specifies level for the three-phase reactive power level at or
AVR 1 VAR LEVEL TO CLOSE
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 . When the source current is an internal summation of two or more CT bank currents, the largest CT
primary is used to define the 1 pu value for this setting.
— In the "VAR" mode, this setting specifies level for the three-phase reactive power level at or
AVR 1 VAR LEVEL TO OPEN
below which to issue the OPEN command. The 1 pu value is defined as for the setting.
VAR LEVEL TO CLOSE
— In the "VAR" mode, this setting specifies the power factor below which close commands are
AVR 1 POWER FACTOR LIMIT
allowed. Also affects open commands as shown in the above figure. If set to "1.00", the power factor has no effect.
5
— Selects the close command characteristic, either "Minimize No. of Ops." (minimize number of
AVR 1 VAR OPEN MODE
operations) or "Minimize Uptime", as described earlier in the Automatic Voltage Regulator Pickup Characteristics in "VAR"
Mode diagram.
— Specifies delay before issuing the close command, and is used to coordinate with other
AVR 1 DELAY BEFORE CLOSE
regulators, or to ride through abnormal system conditions such as faults or re-close sequences.
— Specifies delay before issuing the open command, and is used to coordinate with other
AVR 1 DELAY BEFORE OPEN
regulators, or to ride through abnormal system conditions such as faults or re-close sequences.
— Specifies a dynamic blocking condition. When blocked the element resets its output flags and internal
AVR 1 BLOCK
timers. VT fuse fail is a typical application.
5-270 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL