Playback; Sequence Of Events; Equipment Duty; Selectable Groups Of Settings - GE LPS-D Instruction Manual

1 PRODUCT DESCRIPTION
based on post-OSC Trigger data. The local LCD display does not show target information, but an event mes-
sage and fault report are stored in memory. In either case above, t = 0 is determined by the internal Fault
Detector (FD).
If OSC Trigger comes up initially and FD follows within the disturbance period, the same actions occur and FD
determines t = 0. If only OSC Trigger occurs, then a pseudofault report is created and OSC Trigger determines
t = 0. This arrangement assures that the oscillography function always captures an LPS-D trip, with FD deter-
mining t = 0, regardless of whether an optional internal or external trigger is used.
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 is found in Chapter 11: ALPS-LINK USER GUIDE.
The LPS-D does not store flags for functions that are disabled. For example, if Protection Setting 104:
Z1GROUND = NO and a Zone 1 ground fault is applied, the Zone 1 ground flag will not operate or be stored.
The LPS-D can 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 Sections 8.1.20: PLAYBACK on
page 8–16 for further information on 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. Further information is con-
tained in Section 8.2.7: EVENT INFORMATION on page 8–22.
When the LPS-D 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 2–8 for a complete description of the
Equipment Duty feature.
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 converters) 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 in Figure 1–
8: 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 con-
verters may be assigned to these functions.
NOTE
GE Power Management

1.5.10 SELECTABLE GROUPS OF SETTINGS

LPS-D Line Protection System
1.5 OTHER FEATURES

1.5.7 PLAYBACK

1.5.8 SEQUENCE OF EVENTS

1.5.9 EQUIPMENT DUTY

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