!

SAFETY

FOR LIFE

Alarms

Status and data alarms are available for many control parameters such as voltage, currents, thresholds. Data alarm function compares metered data to user-programmed 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 communication ports and can be configured to trigger a data profile 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 calculation 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 displayed 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 software via the Protection Profile menu. See Figure 14.

S280-79-10

Figure 14.

Fault Location configuration screen.

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.

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.

Refer to Service Information S280-79-2 Form 5 Microprocessor -Based Recloser Control Programming Guide for additional information.

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