GE Multilin F650 User Manual

GE Multilin F650 Digital Bay Controller 5-69
5 SETPOINTS 5.4 PROTECTION ELEMENTS
5
5.4.9 POWER
5.4.9.1 FORWARD POWER UNIT (32FP)
F650 units incorporate a forward power element with three units, as the rest of protection functions. The 32FP element
produces a trip when exported power exceeds the setpoint value. Monitored power is active power, calculated by the three
phase voltages and currents, and it is considered to be exported, positive active power, the one given in the direction of the
line protected by the relay; in this situation, the angle between secondary voltage and current is lower than 90º, according
to the relay wiring diagram.
Figure 5–15: FORWARD POWER CHARACTERISTIC
Table 5–65: 2FP UNIT SETPOINTS
The snapshot event setpoint enables or disables the snapshot event generation for this unit.
The F650 includes three 32FP elements. Each elements incorporates two stages, the first stage, less critical, is intended to
produce an alarm, the second stage is used for trip. Both levels are set in primary values, for instance: if in general
setpoints we set CT_RATIO to a value of 100, and the same value for PT_RATIO, the base power will be: 100 x 100 =
10.000 W
The block time allows blocking the element operation during a set time after the coupling breaker closure. For this purpose
it is necessary to connect the breaker bay using a 52B type contact. The purpose of this setpoint is to avoid spurious trips
caused by overloads after the breaker closure.
Power calculations depending on the VT connection:
1- WYE VT connection, or only one transformer in phase-to-ground connection:
SETPOINT > PROTECTION ELEMENTS > POWER > FORWARD POWER
FORWARD POWER 1> FORWARD POWER 2 > FORWARD POWER 3
SETPOINT DESCRIPTION NAME DEFAULT
VALUE
STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Block from off-line Blk Time After Close 0.00 0.01 s [0.00 : 900.00]
Pickup level for stage 1 Stage 1 Tap 10.00 0.01MW [0.00 : 10000.00]
Trip time for stage 1 Stage 1 Time 60.00 0.01 s [0.00 : 900.00]
Pickup level for stage 2 Stage 2 Tap 20.00 0.01MW [0.00 : 10000.00]
Trip time for stage 2 Stage 2 Time 60.00 0.01 s [0.00 : 900.00]
Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
0
P- P+
RESTRAINING OPERATION
PV
a
I
a
Y
a
cos V
b
I
b
Y
b
cos V
c
I
c
Y
c
cos++=

GE Multilin F650 Specifications

General

Brand	GE
Model	Multilin F650
Category	Controller
Language	English