Negative Sequence - GE 750 Instruction Manual

S5 Protection

Negative Sequence

NEGATIVE
SEQUENCE
GE Multilin
V I ⋅ ( R 2R R )
= + + =
f f CT L s
V 2 2 ⋅ V ⋅ ( V V )
= –
P K F K
2 2 ⋅ 150 V × ( 4353 V 150 V
=
A non-linear resistor is recommended as the peak fault voltage is above relay
voltage maximum of 2000 V.
FIGURE 5–22: Restricted Earth Fault Logic
a) Main Menu
PATH: SETPOINTS S5 PROTECTION
[ ]
MESSAGE
MESSAGE
MESSAGE
Separate protection is provided for the calculated negative sequence time
overcurrent, instantaneous overcurrent and voltage. Each of these features can be
individually blocked by logic inputs.
http://www.GEmultilin.com
13.748 A × ( 3.7 Ω ( 2 × 0.954 Ω
+
→ use 150 V as value for
) 2246 V
– =
NEGATIVE SEQUENCE
NEG SEQUENCE [ ]
See page 5–60.
TIME OVERCURRENT
NEG SEQUENCE [ ]
See page 5–61.
INST OVERCURRENT
NEG SEQUENCE [ ]
See page 5–62.
DIRECTIONAL
NEG SEQUENCE [ ]
See page 5–63.
VOLTAGE
750/760
Feeder Management Relay
) 311 Ω ) 4353 V
+ =
V
(EQ 5.16)
K
5–59