14-14 BE1-951 BESTCOMS Software 9328900990 Rev L
Voltage Protection
Pull down the S
creens menu and select Voltage Protection or click on the Voltage Protection
icon that is shown at the right margin of this paragraph. This screen (
Figure 14-17) has nine tabs
and the first tab is 24. Many of the settings for voltage protection are identical or similar to those
settings in overcurrent protection, so the explanations will not be repeated.
24 (Overexcitation)
This tab (
Figure 14-17) allows you to make the settings for the overexcitation (volts/hertz) element. The
pull-down pickup menu allows you to select the relative pickup quantity. The BE1-951 relay measures the
voltage input in secondary voltage (Sec. V/Hz [default]). If you want to use primary volts (Pri V/Hz), per
unit volts (Per U V/Hz), or percent volts (% V/Hz), you must coordinate the settings in CT & VT Setup and
Conversions. Whatever the measurement, the method is displayed besides the settings - e.g., V
PP
(voltage, phase-to-phase) within a range of 0.5 to 6.0 secondary volts per hertz. Settings for trip Time Dial
and Reset Dial can be adjusted in the range of 0 to 9.9 in .1 increments. The Alarm Threshold (percent of
pickup) can be adjusted from 0 to 120.
Select the BESTlogic box at the bottom of the 24 column. The status of the logic is shown above the
BESTlogic box. A dialog box (BESTlogic Function Element) opens showing the status of the element
logic and the logic scheme name. If you have a custom logic scheme active, you may change the status
of the element logic by pulling down the menu and selecting from the available choices.
Figure 14-17. Voltage Protection Screen, 24 (Overexcitation) Tab
25 (Sync-Check)
This tab (Table 14-18) allows you to make the settings for the sync-check monitor element. The pull down
Delta Voltage menu allows you to select the relative pickup quantity. The BE1-951 relay measures the
voltage input in secondary voltage. If you want to use primary volts, per unit volts, or percent volts, you
must coordinate the settings in CT & VT Setup and Conversions. Whatever the measurement, the
method is displayed besides the settings - e.g., V
PN
(voltage, phase-to-neutral). Settings for Delta Angle
(Degrees) and Slip Frequency (Hertz) are conventional settings. If you want the 25 phase input frequency
to be greater than the auxiliary input frequency during sync-check, click the Enable box as illustrated in
Figure 14-18.
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