Description
2.8 Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
78
Manual, 10/2018, L1V30499596002-01
Enhanced protection functions - only available with
MF Advanced metering function
ETU650 LSI
ETU660 LSIG
Switchable short-time-delayed short-circuit
protection
(inverse-time in relation to I²t)
●
●
Setting range of delay time t
dsd
FW in forward
direction
0.1 to 0.5 s (in steps of 0.01)
Default value: 0.2 s
0.1 to 0.5 s (in steps of 0.01)
Default value: 0.2 s
Setting range of delay time t
dsd
BW in backward
direction
0.1 to 0.5 s (in steps of 0.01)
Default value: 0.2 s
0.1 to 0.5 s (in steps of 0.01)
Default value: 0.2 s
Switchover to alternative operating values with
directed (directional) short-circuit current during
the switch-on phase (inrush adaptation)
for tripping characteristic t=k (fixed) possible
●
●
Setting range of the switch-on phase
0.10 to 30 s (in steps of 0.01)
Default value: 0.1
0.10 to 30 s (in steps of 0.01)
Default value: 0.1
Setting range I
dsd
= I
n
x … during the switch-on
phase in the forward direction FW
0.6 to 10 (in steps of 0.1)
Default value: 2
0.6 to 10 (in steps of 0.1)
Default value: 10
Setting range I
dsd
= I
n
x … during the switch-on
phase in the backward direction BW
0.6 to 10 (in steps of 0.1)
Default value: 2
0.6 to 10 (in steps of 0.1)
Default value: 10
Settings DST phase difference angle
3.6°; 7.2°; 10.8°; 14.5°; 18.2°; 22.0°; 25.9°; 30°; 34.2°;
38.7°; 43.4°; 48.6°; 54.3°; 61.0°; 69.6°
Default value: 3.6°
Definition of direction of power flow
Bottom
→ top; top → bottom
Default value: top → bottom
V-NBA
Phase voltage unbalance V-NBA
Protection function can be enabled/disabled
●
●
Setting range U
nba
phase voltage unbalance
2 to 90% (in steps of 1%)
Default value: 50%
2 to 90% (in steps of 1%)
Default value: 50%
Setting range of the delay time t
nba
for phase
voltage unbalance
0.50 to 60 s (in steps of 0.5)
Default value: 10 s
0.50 to 60 s (in steps of 0.5)
Default value: 10 s
Enabling/disabling of tripping on phase voltage
unbalance
●
●
V
u
Undervoltage protection V
u
Protection function can be enabled/disabled
●
●
Setting range of undervoltage protection U
u
=
U
n
x ...
0.5 to 0.98 (in steps of 0.01)
Default value: 0.9
0.5 to 0.98 (in steps of 0.01)
Default value: 0.9
Setting range of the delay time for undervoltage
protection
0.05 to 120 s (in steps of
0.01)
Default value: 10 s
0.05 to 120 s (in steps of
0.01)
Default value: 10 s
Enabling/disabling of tripping on undervoltage
protection
●
●
V
o
Overvoltage protection V
o
Protection function can be enabled/disabled
●
●
Setting range of overvoltage protection U
o
= U
n
x ...
1.02 to 1.5 (in steps of 0.01)
Default value: 1.05
1.02 to 1.5 (in steps of 0.01)
Default value: 1.05
