Siemens SENTRON 3WL10 - Page 72

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