Date Code 20011026 Event Reporting 4-3
SEL-321/321-1 Instruction Manual
Table 4.4: Event Types
Event Type Comment
AG A-Phase to Ground Fault
BG B-Phase to Ground Fault
CG C-Phase to Ground Fault
AB AB Two-Phase Fault
BC BC Two-Phase Fault
CA CA Two-Phase Fault
ABG AB Two-Phase to Ground Fault
BCG BC Two-Phase to Ground Fault
CAG CA Two-Phase to Ground Fault
ABC Three-Phase Faults
The following shows an example summary event report:
Example: BUS B, BREAKER 3 Date: 02/01/93 Time: 01:36:50.070
Event : AG T Location: 2.43 Frequency: 60.2
Targets: INST ZONE 1 EN AG V1 Mem: 131.2/77
=>
The relay retains the summary event report buffer when control power is removed. Long event
report data is cleared when control power is removed.
DEFAULT EVENT REPORT
Generate the default event report using the EVENT x command, with no format specifier. These
reports default to 11-cycle duration, four samples/cycle, and resemble the reports from the
SEL-100/200 series relays. Each report contains voltages, currents, factory selected relay
elements, inputs and outputs. These reports support analysis of most relay operations. The
default report analog data are sampled every 1/16-cycle, but display every quarter-cycle. Binary
elements (relay elements, contact inputs, and contact outputs) are displayed as follows:
• If an element is set at any time during a quarter-cycle period, it is displayed as set;
otherwise, it is cleared. Given that elements A and B pick up in alternate 1/8-cycles, but
not simultaneously, and assuming that element C = A*B, the filtered report would show A
and B true, but C false, because A and B were not picked up at the same time.
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