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1 PRODUCT DESCRIPTION
Oscillography data include station and line identification, a complete list of the active relay settings, the fault
report, internal flags, and a selectable number of prefault and postfault data samples. Further description of
this function can be found in Section 11.8.5: OSCILLOGRAPHY REPORT on page 11–24.
The LPS-O does not store flags for functions that are disabled.
The LPS-O relay system has the ability to replay stored digital current and voltage signals from oscillography
files through the protection algorithms. The currents and voltages may be obtained from a factory stored file,
from any oscillography file currently stored in the relay, or from an oscillography file stored on a PC. See Sec-
tions 8.1.19: PLAYBACK on page 8–15 and 11.8.5: OSCILLOGRAPHY REPORT on page 11–24 for a com-
plete description of the Playback feature.
This function time tags and stores the last 150 events in memory. The resolution of the time-tagging is 1 milli-
second. The event list contains power system events, operator actions, and self-test alarms. The sequence of
events can be accessed remotely via the front panel port, PL-1 or PL-2, and a PC. A full description of this
function is contained in Section 11.8.9: EVENT REPORT on page 11–25.
When the LPS-O is applied with a single breaker, the LPS-O relay system incorporates the ability to monitor
the number of breaker operations and the breaker duty. Alarm levels can be set for both the total number of
breaker operations and the total equipment duty. See Chapter 2: CALCULATION OF SETTINGS, Chapter 8:
LOCAL USER INTERFACE, and Chapter 11: LPSO-LINK USER GUIDE for a complete description of the
Equipment Duty feature.
Four groups of protection settings may be stored in nonvolatile memory. Only one group can be active at a
given time, but the active group may be selected by external contacts, by a command issued from the local
keypad, or remote communication software. If the selection is to be made by an external switch, then two of the
digital inputs (contact converters) are used. A four-position SB1 or SBM switch with two stages (two effective
contacts) could be used to select the active group of settings, as shown in Figure 1–6: SWITCH SELECTION
OF ACTIVE SETTING GROUP.
Note:
For this example CC5 has been assigned to "CGST2" (Change Setting Group Input, Bit 1), and
CC6 has been assigned to "CGST1" (Change Setting Group Input, Bit 0). Other contact convert-
ers may be assigned to these functions.
GE Power Management
1.5.9 SELECTABLE GROUPS OF SETTINGS
LPS-O Line Protection System
1.5 OTHER FEATURES
1.5.6 PLAYBACK
1.5.7 SEQUENCE OF EVENTS
1.5.8 EQUIPMENT DUTY
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