S&C Vista - Viewing Event Logs; Trip Event Log

46 S&C Instruction Sheet 681-530
Viewing Event Logs
The Trip Event Log displays the last 64 events recorded by the overcurrent control.
The Trip Event Log records seven messages in the order the event occurs, with the
most recent event on top. Trip events remain recorded even if the control loses power
and will only be removed if more than 64 events are recorded (the oldest event will be
overwritten) or if the log is cleared manually. The Event Cause column shows the cause
of the event that occurred, and the Event Type column displays which element initiated
the trip operation. The interrupter the event occurred on will be displayed under Faulted
Interrupter, and the Time-Overcurrent phase or element that initiated the trip will show
in the Fault Status column. The phase current at the time of the event is also shown. A
key to the Trip Event Log is listed in Table 5.
A sample trip event log might look like Figure 38.
Figure 38. The Trip Event Log.
Table 5. Trip Event Log Descriptions
Event Cause Description
Timing
The minimum pickup/trip current of a given element has been exceeded and the control
begins timing.
Tr i p
The time and current thresholds have been exceeded for a given element and a trip
operation is initiated.
Resetting
The current drops below the pickup value, and does not initiate a trip after the control has
started timing. Control is timing down, but not reset.
Reset The control has reset.
Event Types Description
TOC Time-Overcurrent Fault (for any event involving the inverse segment for a given element)
DT#1 Definite-Time Fault against DT#1
DT#2 Definite-Time Fault against DT#2
TCP Thermal Characteristic Protection
Reset Reset element
Fault Status Description
A A Phase
B B Phase
C C Phase
Q Negative-Sequence
G Ground
Trip Event Log