Schweitzer Engineering Laboratories SEL-751 - Table 10.8 HIF Downed Conductor; Table 10.9 SUM HIF Command

10.32
SEL-751 Relay Instruction Manual Date Code 20170927
Analyzing Events
High-Impedance Fault (HIF) Event Reporting
The system frequency is displayed as measured at the time of trigger to two
decimal places. Pretrigger currents are obtained from the first sample in the
event report, while post-trigger currents are obtained from the initial trigger
sample.
Viewing the HIF Event Summary
Access the history report from the communications ports by using the HIS
HIF command or the analysis menu within QuickSet. View and download
HIF history reports from Access Level 1 and higher.
You can use the SUM
HIF command to retrieve HIF event summaries by
event number. (The relay labels each new event with a unique number as
reported in the HIS
HIF command history report; see High-Impedance Fault
Event History on page 10.33.) Table 1 0. 9 lists the SUM
HIF commands.
CSUMMARY HIF
The relay outputs a Compressed ASCII HIF summary report for SCADA and
other automation applications. Issue ASCII command CSU HIF to view the
Compressed ASCII HIF summary report. A sample of the summary report
appears in Figure 10.12; this is a comma-delimited ASCII file. The relay
appends a four digit hex checksum at the end of the lines in the Compressed
ASCII report.
Items included in the Compressed ASCII summary report are similar to those
included in the summary report, although the relay reports the items in a
special order. For the purpose of improving products and services, SEL
sometimes changes the items and item order.
See Compressed Event Reports on page 10.2 for more information on the
Compressed ASCII command set.
Table 10.8 HIF Downed Conductor
Downed Conductor Conditions
YES Assertion of any one of the following Relay Word bits: HIA1_A,
HIA1_B, HIA1_C, HIA2_A, HIA2_B, HIA2_C, HIF1_A,
HIF1_B, HIF1_C, HIF2_A, HIF2_B, HIF2_C, AND LRX (LRA,
LRB, LRC) bit asserts where X is the same phase as the alarm or
fault phase.
NO When the previous condition is not true.
Ta b l e 1 0.9 SUM H I F Co m m an d
Command Description
SUM HIF Return the most recent HIF event summary.
SUM HIF n Return an event summary for HIF event n
a
.
a
The parameter n indicates event record number. The most recent event has a record number
of one (1).