Cooper Kyle Form 5/Triple-Single Installation Instructions Manual page 19

SAFETY
FOR LIFE
The following system parameters must be entered via the
Protection Profile menu for each profile:
• Nominal system line-to-line voltage
Note: If the Fault Location feature is not desired, the nom-
inal system voltage parameter should be set at 1.
• Source-side zero sequence and positive sequence
impedance. This includes impedance up to the loca-
tion of the Form 5/Triple-Single control.
• Line-side zero sequence and positive sequence
impedance per mile or km.
• The distance units of the line impedance in miles or
km.
IMPORTANT: Fault Location is not a protection func-
tion. Its purpose is to define a fault and provide its
approximate location relative to the Form 5/Triple-Sin-
gle control detecting the fault.
Refer to Service Information S280-79-2 Form 5 Micropro-
cessor-Based Recloser Control Programming Guide for
additional information.
Directional Sensitive Ground/Earth
(SGF/SEF) Fault
The Directional SGF/SEF Fault feature adds directional
capabilities to the SGF/SEF protection features. It pro-
vides a sensitive ground/earth trip if the fault is downline
of the recloser on a radial distribution system. Directional
SGF/SEF is used on ungrounded Delta systems for sup-
pression of ground trips for faults occurring on other circuit
branches.
The user sets the parameters for Direction SGF/SEF
through the interface software via the Protection Profile
menu. See Figure 17. In addition to the normal (non-direc-
tional) SGF/SEF settings, the user enters the following
directional SGF/SEF parameters:
• Direction Enable
Note: If Direction Enable is not selected, SGF/SEF tripping
occurs through normal (non-directional) settings.
• Maximum Torque Angle (-180° to 180°, in 1° increments)
• Torque Angle Width (10° to 90°, in 1° increments)
• Zero Sequence Voltage (V
The Maximum Torque Angle parameter determines the
angle of maximum tripping sensitivity between the phase
angle of the zero sequence voltage and current at the time
of fault. The setting of this value depends on knowledge
of the power system. Typically a resistive fault has a value
of 0°, and a capacitive fault has a value of 90°.
Threshold (4 to 130 V)
0 )
Torque Angle Width parameter restricts the tripping to an
angle of plus or minus the specified width about the
Torque angle setting. For example, if the Maximum
Torque Angle is 45°, and the Torque Angle Width is set for
10°, then the control will trip at angles between 35° and
55°.
The Zero Sequence Voltage Threshold is used to set the
threshold voltage below the disabled directional SGF/SEF
tripping voltage.
Note: In most cases, a default value of 4 is adequate.
Directional SGF/SEF Fault is recorded as an event in the
control Event Recorder for retrieval. Refer to Service
Information S280-79-2 Form 5 Microprocessor-Based
Recloser Control Programming Guide for additional
information.
Figure 17.
Directional SGF/SEF configuration screen.
S280-42-3
19