Table of Contents
Advertisement
1 PRODUCT DESCRIPTION
1.4 OTHER FEATURES
1.4.9 FAULT REPORT & OSCILLOGRAPHY DATA
1
A fault report is initiated by any one of the protection-function pickup flags or an optional external oscillography
trigger input, DI5. For the fault report to be completed and stored, the DGP either has to issue a trip or the DI5
input contact must close any time during the fault report period. The fault report period begins when the first
protection function flag is up or the DI5 input contact is closed. It ends when the DGP issues a trip or when it
has captured the selected number of post-fault waveform cycles, whichever is later. If all the pickup flags reset
without issuing a trip and the DI5 does not close, the fault report initiated by the protection flag will not be com-
pleted or stored.
The fault report includes the Unit ID, date and time, system operating time, pre-fault metering values, fault cur-
rents and voltages, trip/fault types, and up to 14 sequence-of-event points logged after initiation. The system
operating time (OP TIME) is the time difference between the first protection function pickup flag and the first
protection function trip. The DGP stores the last three fault reports in its memory. A full description of the fault
report is contained in Chapter 8: INTERFACE.
DGP models with oscillography data capture capability will store waveform data in their memory each time the
system stores a fault report. A total of 120 cycles of data can be stored. The 120 cycles in memory are divided
in one, two, or three partitions, based on Setting 111: NUM FLTS. The number of prefault cycles captured per
fault can be set up to 20 cycles. It should be noted that the pre-fault cycles are based on the first flag or DI5 to
initiate the data capture.
Oscillography data includes station and generator identification, a complete list of settings, the fault report,
internal flags, and a selected number of pre-fault and post-fault waveform cycles. This data can be displayed
using the GE-Link software program. See Chapter 10: GE-LINK SOFTWARE for details.
1.4.10 LOCAL MAN-MACHINE INTERFACE
A local man-machine interface (MMI), incorporating a keypad, LED display, and 19 target LEDs, is provided to
allow the user to enter settings, display present values, view fault target information, and access stored data.
The use and functioning of the MMI is fully described in the Chapter 8: INTERFACE.
1.4.11 LOCAL PRINTER
An optional printer port (PL-2) on the rear of the DGP permits the use of a serial printer. The port can also be
used to connect the DEC1000 Contact Expansion Unit (DGP***ACA models only) which provides eleven addi-
tional output relays. The sequence-of-events (SOE) data are available at this port for immediate printing as
they occur. Additionally, for DGP***AAA models, a variety of information stored in the DGP system memory
can be printed when requested via the local MMI; see Chapter 8: INTERFACE for details.
GE Power Management
DGP Digital Generator Protection System
1-
21
Advertisement
Table of Contents
