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Alarms
Status and data alarms are available for many control
parameters such as voltage, currents, thresholds. Data
alarm function compares metered data to user-pro-
grammed alarm high and low limits and issues an alarm of
user-specified priority if limits are exceeded. The status
alarm function monitors status and issues an alarm of
user-defined priority when the user programmed alarm
conditions are met. The alarms are reported via commu-
nication ports and can be configured to trigger a data pro-
file and event record. Alarms do not affect the protection
functions of the control.
Fault Location
Fault Location provides an approximate distance of a fault
from the the Form 5 Control The distance is based on the
current fault magnitude, the type of fault, and system
parameters entered by the user. The LCD display (Screen
38) identifies the estimated distance in miles or kilometers
(km) from the control.
The fault location algorithm performs an impedance cal-
culation based on:
• Single-phase to ground fault
• Phase-to-phase fault
• Double-line to ground fault
• Three-phase fault
This information is recorded as an event in the control
Event Recorder for retrieval. The fault location algorithm
does not require voltage sensing. If the location cannot be
determined, no event is recorded and dashes are dis-
played on the LCD screen.
Setting the parameters for Fault Location is done through
the interface software. The user enters line impedance
parameters and system voltage information into the soft-
ware via the Protection Profile menu. See Figure 14.
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 control.
• Line-side zero sequence and positive sequence
impedance per mile or km.
• The distance units of the line impedance in miles or
km.
Refer to Service Information S280-79-2 Form 5 Micropro-
cessor-Based Recloser Control Programming Guide for
additional information.
S280-79-10
17
!
SAFETY
FOR LIFE
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 control
detecting the fault.
Figure 14.
Fault Location configuration screen.