6-4
Metering and Monitoring
Date Code 20010731
SEL-352-1, -2 Instruction Manual
Date and Time
Recording of the date and time stamp occurs at the time of the breaker operation based on the
assertion of the condition reported in the operation column.
Operation
The relay records a breaker operation at the time any of the following Relay Word bits assert:
TRIPA corresponds to an A-phase trip operation
TRIPB corresponds to a B-phase trip operation
TRIPC corresponds to a C-phase trip operation
CCA corresponds to an A-phase close operation
CCB corresponds to a B-phase close operation
CCC corresponds to a C-phase close operation
Electrical Operate Time
The relay defines electrical operating time per phase. The A-phase tripping time is measured
from the assertion of TRIPA to the dropout of 50MNA (0.02
•I
nom
)
.
The electrical operating time for A-phase closing is measured from the assertion of CCA to the
pickup of 50MNA or the dropout of 87THA (whichever occurs first).
If the breaker operating time exceeds both the SlowCl and SlowTr settings, the relay reports the
larger of these two settings with an ap (plus) symbol. B- and C-phases are similar.
Mechanical Operate Time
The relay defines mechanical operating time per phase. The A-phase tripping time is measured
from the assertion of TRIPA to the dropout of 52AA.
The mechanical operating time for A-phase closing is measured from the assertion of CCA to the
pickup of 52AA.
If the breaker operating time exceeds both the SlowCl and SlowTr settings, the relay reports the
larger of the two with an ap (plus) symbol. B- and C-phases are similar.
Energy
Energy measurement occurs during each trip and close operation on a per-pole basis. The energy
is the integration of the power dissipated by the breaker during the electrical operating time. The
power dissipation is determined by the amount of current times the difference voltage across the
breaker.
Current
Current measurement occurs during each trip and close operation on a per-pole basis. The
current is the maximum filtered current through the breaker during the electrical operating time.
Содержание SEL-352-1
Страница 8: ......
Страница 10: ......
Страница 12: ......
Страница 30: ......
Страница 68: ......
Страница 186: ......
Страница 292: ......
Страница 300: ...9 8 Front Panel Interface Date Code 20010731 SEL 352 1 2 Instruction Manual Figure 9 3 Front Panel Operation Map ...
Страница 302: ......
Страница 368: ......
Страница 370: ......
Страница 374: ......
Страница 380: ......
Страница 382: ......
Страница 384: ......
Страница 386: ......
Страница 396: ......
Страница 404: ......
Страница 422: ......
Страница 442: ......