Table of Contents
Advertisement
Protection functions of the ETU
G direct
GF direct: Ground-fault protection direct
measurement
Protection function can be selected
•
R
- residual-current protection
c
(with summation current transformer)
•
G
- ground-fault return protection
ret
(transformer in the star point)
Rc - residual-current protection
(with summation current transformer)
Setting range operating value residual current I
Setting range for delay time t
Gret ground-fault return protection
(ground return - transformer in the star point)
Design of G
ret
(ground fault return CT, I
Setting range operating value ground fault return
I
= I
g_ret
CT_rating
Setting range of delay time t
Setting range for delay time t
point 4 x I
)
n
Ground-fault return protection pre-alarm
Switchover to alternative operating values with
ground-fault current during the switch-on phase
(inrush adaptation) for tripping characteristic t=k
(fixed) possible
Setting range of the switch-on phase (inrush
adaptation)
Setting range I
phase (inrush adaptation)
DAS
DAS (Arc fault mitigation)
Protection function can be enabled/disabled
Setting range for operating value I
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
∆n
transformer
)
CT_rating
x ...
(fixed) t=k
g_ret
at I²t (reference
g_ret
= I
x ... during the switch-on
g
n
= I
i_arc
ETU650 LSI
—
—
—
—
∆n
—
—
—
—
—
—
—
—
—
—
●
x ...
1.5 to 15 (in steps of 0.1)
n
Default value: 1.5
Description
2.9 Electronic trip unit ETU
ETU660 LSIG
●
Default set: Not installed
Ground return CT; Rc CT; nec‐
essary
●
Alternative to GF and G_ret
Default value: OFF
Possible with current sensor
Rc & MF advanced
3; 5; 7; 10; 20; 30 A
Default value: OFF
Possible with current sensor
Rc & MF advanced
0.06; 0.1; 0.2; 0.3; 0.4; 0.5;
0.8 s
●
Alternative to GF and Rc
100; 250 A
Default value: 100 A
0.1 to 1 x I
(in steps of
CT_rating
0.001)
Default value: 0.1
0.1 to 1 s (in steps of 0.05)
Default value: 0.1s
0.1s to 1s (in steps of 0.05)
50 to 90% x I
(in steps of 1%)
r
Default value: 90%
●
Default value: OFF
0.1 to 30 s (in steps of 0.01)
Default value: 0.1
0.1 to 1 (in steps of 0.01)
Default value: 1
●
1.5 to 15 (in steps of 0.1)
Default value: 1.5
71
Advertisement
Table of Contents
