Neutral Overcurrent - GE Multilin 745 Instruction Manual

745
Transformer Management Relay
NOTE

Neutral Overcurrent

! NEUTRAL OC
5–56
• W1(3) PHASE INST OC 1(2) PICKUP: Enter the level of phase current (in
units of relay nominal current) above which the Winding 1(3) Phase
Instantaneous Overcurrent 1 element will pickup and start the delay timer.
• W1(3) PHASE INST OC 1(2) DELAY: Enter the time that the phase current
must remain above the pickup level before the element operates.
The setpoint messages above and the following logic diagram are identical
for the Phase Instantaneous Overcurrent 2 element.
FIGURE 5–16: Phase Instantaneous Overcurrent 1 Scheme Logic
a) Main Menu
PATH: SETPOINTS !" S4 ELEMENTS
! W1 NTRL
[!]
! W2 NTRL
MESSAGE
! W3 NTRL
MESSAGE
! W1 NTRL
MESSAGE
! W2 NTRL
MESSAGE
! W3 NTRL
MESSAGE
! W1 NTRL
MESSAGE
! W2 NTRL
MESSAGE
! W3 NTRL
MESSAGE
In the 745, "neutral" refers to residual current (3I
vector sum of the three phases. The relay includes neutral time overcurrent and two
levels of neutral instantaneous overcurrent for each winding.
http://www.GEindustrial.com/multilin
!" NEUTRAL OC
[!]
See page 5–57.
TIME OC
[!]
See page 5–57.
TIME OC
[!]
See page 5–57.
TIME OC
[!]
See page 5–58.
INST OC 1
[!]
See page 5–58.
INST OC 1
[!]
See page 5–58.
INST OC 1
[!]
See page 5–58.
INST OC 2
[!]
See page 5–58.
INST OC 2
[!]
See page 5–58.
INST OC 2
), calculated internally as the
0
S4 Elements
GE Multilin