Schweitzer Engineering Laboratories SEL-751 - Table 7.21 HISTORY Command; Table 7.22 HIS HIF Command

7.37
Date Code 20170927 Instruction Manual SEL-751 Relay
Communications
Communications Protocols
HISTORY Command
Use the HIS command (see Table 7 .21) to view a list of one-line descriptions
of relay events or clear the list (and corresponding event reports) from
nonvolatile memory. For more information on event reports, see Section 10:
Analyzing Events.
HIS HIF Command
The HIS HIF command displays a quick synopsis of the last 100 high-
impedance fault (HIF) events that the relay has captured. The rows in the HIS
HIF report contain the event reference number, date, time, event type,
location, maximum current, active group, and targets. See High-Impedance
Fault Event History on page 10.33 for the HIS HIF report format. Use the
HIS HIF command to list one-line descriptions of relay events. You can list
HIF event histories by number or by date. This command is only available
when the relay supports HIF detection.
HIS C and HIS R Command
The HIS C and HIS R commands clear/reset the history data and
corresponding high-resolution/event report data on the present port. The relay
prompts,
Clear all event reports. Are you sure (Y/N)? when you
issue the HIS C and HIS R commands. If you answer
Y <Enter>, the relay
clears all HIF event reports.
Table 7.21 HISTORY Command
Command Description Access Level
HIS Returns event histories with the oldest at the bot-
tom of the list and the most recent at the top of the
list.
1
HIS n Returns event histories with the oldest at the bot-
tom of the list and the most recent at the top of the
list, beginning at event n.
1
HIS C or R Clears/resets the event history and all correspond-
ing event reports from nonvolatile memory.
1
Table 7.22 HIS HIF Command
Command Description Access Level
HIS HIF Returns HIF event histories with the oldest at the
bottom of the list and the most recent at the top of
the list.
1
HIS HIF n Returns the n most recent HIF event histories
with the oldest at the bottom of the list and the
most recent at the top of the list.
1
HIS HIF C or R Clears/resets the HIF events reports but retains
the event history.
1
HIS HIF CA or RA Clears/resets the HIF event history and all the
corresponding event reports from the nonvolatile
memory.
1
Parameter
n Indicates a record number. The most recent event has record num-
ber one (1).