Fault Location
The relay fault locating function is separate from the protective functions. The relay
calculates fault location from data stored in the 44 cycle event report. It calculates a fault
location for every event report which has fault detecting elements asserted between the 8th
and 39th event report rows.
The relay uses the fault type selected above and performs a fault locating calculation based on
the Takagi algorithm, if prefault data is available. The Takagi algorithm uses prefault current
values to compensate for the effects of fault resistance, load current, and remote infeed.
When protective elements are picked up in the first four Event Report rows, the relay uses the
simple reactance method calculation for fault locating.
Secondary Ohms
The relay also displays the fault location in secondary ohms. This value corresponds to the
distance value calculated above when the protected line has a constant impedance per unit
distance characteristic.
Fault Duration
The event summary contains a fault duration calculated from the first pickup of a fault
detecting element until the last fault detecting element drops out or the event report ends.
Maximum Phase Current
The relay displays the maximum phase current magnitude calculated in the same event report
row where fault data was gathered for the fault locating calculation. This data helps show the
severity of the fault.
LONG EVENT REPORT
The long event report contains 44 quarter-cycles of prefault, fault, and post fault voltage and
current information. For each quarter-cycle of voltage and current information, the relay also
records the states of all fault measuring elements, outputs, and inputs. This information is
useful in reviewing fault inception and duration, relay element response, fault evolution,
interaction with communications equipment, and breaker reaction time.
The last twelve event records are stored in volatile memory. You can review the stored
summary reports quickly with the HISTORY command; use the EVENT command to display
the long form of each event report.
Date Code 920423
Event Reporting
SEL-221F, -1 Instruction Manual
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Содержание SEL-221F
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Страница 110: ...Example Event Report 2 4 12 Event Reporting SEL 221F 1 Instruction Manual Date Code 930830 ...
Страница 158: ...SETTINGS SHEET FOR SEL 221F RELAY PAGE 2 OF 6 DATE Date Code 921110 ...
Страница 160: ...SETTINGS SHEET PAGE 4 OF 6 FOR SEL 221F RELAY DATE Date Code 930601 ...
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Страница 170: ...Figure 6 2 Horizontal Front and Rear Panel Drawings Date Code 920508 Installation 6 7 SEL 221F 1 Instruction Manual ...
Страница 174: ...Figure 6 8 Dc External Connection Diagram Typical Date Code 920508 Installation SEL 221F 1 Instruction Manual 6 11 ...
Страница 228: ...APPENDICES TABLE OF CONTENTS Parts Placement Diagram Date Code 920508 Table of Contents SEL 221F 1 Instruction Manual i ...
Страница 229: ...SEL 200 Series Relay Main Board Troubleshooting Test Points and Jumper Locations ...