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S3 PROTECTION
6–46
PH DIR FUNCTION
Range: Disabled, Alarm, Latched Alarm, Control
Default: Disabled
When Alarm function is selected, the alarm LED will flash upon detection of Reverse
direction for any phase, and will drop out when the direction changes to Forward for all
phases. When Latched Alarm is selected, the alarm LED will flash upon detection of
Reverse direction, and will stay lit (latched) after the direction for all phases is Forward.
The alarm LED can be reset by issuing the reset command. Detection of Reverse
direction when Control function is selected does not trigger the alarm LED.
PH DIR MTA
Range: 0º to 359º Lead in steps of 1
Default: 30º
This setting sets the Maximum Torque Angle (MTA) for the Phase Directional element to
define the regions of Forward and Reverse directions. This is the angle of maximum
sensitivity, i.e. maximum torque angle by which the operating current leads the
polarizing voltage.
MIN POL VOLTAGE
Range: 0.00 to 1.25 x VT in steps of 0.01
Default: 0.05 x VT
This setting is used to establish the minimum level of voltage for which the phase angle
measurement is reliable. The setting is based on VT accuracy.
BLOC OC DIR UN
Range: Disabled, Enabled
Default: Enabled
This setting establishes the procedure under undefined direction (voltage below
threshold). If enabled, OC elements with "Forward" or "Reverse" setting are blocked;
otherwise, they are not.
OUTPUT RELAY X
For details see
Common
BLOCK 1/2/3
For details see
Common
setpoints.
setpoints.
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
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