GE Power Management
ALPS Advanced Line Protection System
1-17
1 PRODUCT DESCRIPTION
1.5 OTHER FEATURES
1
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 information on reading oscillography with
ALPS-Link is found in Section 11.6.5: OSCILLOGRAPHY REPORT on page 11–15. The ALPS does not store flags for
functions that are disabled. For example, if Protection Setting 104: Z1GROUND = NO and a Z1 ground fault is applied, the
Zone 1 ground flag will not operate or be stored.
1.5.7 PLAYBACK
The ALPS 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 Section 8.1.20: PLAYBACK on page 8–13 for a com-
plete description of the Playback feature.
1.5.8 SEQUENCE OF EVENTS
This function time tags and stores the last 150 events in memory. The resolution of the time-tagging is 1 millisecond. 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 event list contained in Section 8.2.7: EVENT INFORMA-
TION on page 8–19.
1.5.9 EQUIPMENT DUTY
When the ALPS is applied with a single breaker, it 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
Section 2.2.4: EQUIPMENT DUTY on page 2–6 for a complete description of the Equipment Duty feature.
1.5.10 SELECTABLE GROUPS OF SETTINGS
Four separate 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 convert-
ers) are used for this purpose. 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 Figure 1–9: SWITCH SELECTION OF ACTIVE SETTING GROUP below.
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 converters may be assigned
to these functions.
NOTE
