Frequency; Frequency Actual Values; Synchrocheck; Synchrocheck Actual Values - GE Multilin F650 Instruction Manual

6.2 STATUS

6.2.4.1 FREQUENCY

F650 units incorporate three overfrequency and three underfrequency units. For each of them there are two magnitudes
pickup and trip (operation).
Frequency elements are often used in generating plants, as well as in the connection of substations to the main system.
Frequency monitoring is the base for synchronous machines protection application, with a couple of setting levels, as well
as for the development of automatic shedding functions and underfrequency reset.
This screen shows the activation of all frequency elements available in the F650. It can be accessed from the menu:
Actual> Status > Control Elements >Frequency, and it includes the following signaling LEDs.
Table 6–13: FREQUENCY ACTUAL VALUES
OVERFREQUENCY ACTUAL VALUES
OVERFREQ1 PKP
OVERFREQ1 OP
OVERFREQ2 PKP
OVERFREQ2 OP
OVERFREQ3 PKP
OVERFREQ3 OP

6.2.4.2 SYNCHROCHECK

This screen can be accessed at Actual> Status > Control Elements > Synchrocheck, and it includes the following
signaling LEDs for the synchronism check function:
Table 6–14: SYNCHROCHECK ACTUAL VALUES
6
SYNCROCHECK BLK INP:
SYNCROCHECK OP:
SYNCHK CLOSE PERM:
SYNCROCHECK COND OP: Closing permission according to permission logics (DL-DB, LL-DB, DL-LB).
6-8
UNDERFREQUENCY ACTUAL VALUES
UNDERFREQ1 PKP
UNDERFREQ1 OP
UNDERFREQ2 PKP
UNDERFREQ2 OP
UNDERFREQ3 PKP
UNDERFREQ3 OP

SYNCHROCHECK ACTUAL VALUES

SYNCROCHECK BLK INP
SYNCROCHECK OP
SYNCHK CLOSE PERM
SYNCROCHECK COND OP
DL-DB OPERATION
DL-LB OPERATION
LL-DB OPERATION
SLIP CONDITION
BUS FREQ > LINE FREQ
BUS FREQ < LINE FREQ
Block signal for the synchrocheck unit, configurable at Setpoint > Relay Configuration >
Protection Elements
Closing permission signal in live line-live bus conditions with open breaker.
General Closing permission of the Synchronism unit. It contemplates all possible situations,
live line-live bus conditions, and the closing permission logics (dead line-dead bus, live line-
dead bus, dead line-live bus). Note: in case the Function is disabled, the Closing permission
signal will be activated in order not to interfere with possible logics where it is included. If the
synchronism unit is enabled, this signal will only be activated in the closing conditions
established by setting.
DL-DB OPERATION: Closing permission in dead line – dead bus condition.
DL-LB OPERATION: Closing permission in dead line – live bus condition.
F650 Digital Bay Controller
6 ACTUAL VALUES

6.2.4 CONTROL ELEMENTS

GE Multilin