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BE1-CDS240 Reporting and Alarm Functions
6-27
In Figure 6-16, a 62x auxiliary relay is shown. In this case, the impedance of the 62x coil is small
compared to the impedance of the TCM circuit so the TCM is always at logic 1. This prevents the TCM
logic from working, even if the trip coil is open. Normally, when redundant systems are used, each relay
system is on an individual circuit and the sensing input for each relay system is isolated from the tripping
circuit.
Setting the Trip Coil Monitor Function
The TCM function can be programmed from the ASCII command interface using the SB-LOGIC (set
breaker logic) command. For more information on setting the trip coil monitor, refer to
Setting the Breaker
Status Reporting Function
earlier in this section.
FAULT REPORTING
Fault Reporting Expressions and Settings
The fault reporting function records and reports information about faults that have been detected by the
relay. The BE1-CDS240 provides many fault reporting features. These features include Fault Summary
Reports, Sequence of Events Recorder Reports, Oscillographic Records, and Targets.
Logic expressions are used to define the three conditions for fault reporting. These conditions are Trip,
Pickup, and Logic trigger. Figure 6-10 and Table 6-11 illustrate how each of these logic expressions is
used by the various relay functions. Note that even though BESTlogic expressions are used to define
these conditions, these expressions are not included here. Section 7,
BESTlogic Programmable Logic
,
provides information about using BESTlogic to program the relay.
Trip
Trip expressions are used by the fault reporting function to start logging targets for an event and to record
fault current magnitudes at the time of trip. The trip expression is used to illuminate the Trip LED on the
HMI. The Trip LED will turn on and remain on as long as the trip expression is true. The Trip LED will
remain on (or “sealed-in”) after the trip expression becomes false if targets are associated with the trip.
The breaker monitoring function uses the trip expression to start counting the breaker operate time.
Pickup
Pickup expressions are used by the fault reporting function to time-stamp the fault summary record, time
the length of the fault from pickup to dropout (fault clearing time), and to control the recording of
oscillographic data. The pickup expression is used to flash, on and off, the Trip LED on the HMI. The Trip
LED will continue to flash on and off as long as the pickup expression is true and the trip expression is not
true. A pickup expression is also used by the setting group selection function to prevent a setting group
change during a fault.
Logic
Logic trigger expressions allow the fault reporting function to be triggered even though the relay in not
picked up. A logic trigger expression provides an input to the fault reporting function much as the pickup
expression does. This logic expression is not used by the setting group selection or the HMI.
Fault Reporting Trigger Settings
Fault reporting trigger settings are made from the
BESTlogic Function Element
screen in BESTCOMS.
Figure 6-17 illustrates the BESTCOMS screen used to select BESTlogic settings for the
Fault Recording
function. To open the
BESTlogic Function Element
screen for
Fault Recording
, select
Reporting and
Alarms
from the
Screens
pull-down menu. Select the
Fault Recording
tab. Then select the
Logic
button in
the
Fault Recording
box in the upper left hand corner of the screen. Alternately, settings may be made
using SG-TRIGGER ASCII command.
Summary of Contents for BE1-CDS240
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