ABB SACE Tmax XT7 - Page 91

ABB | SACE Tmax XT
Protections | 17 - Performance table89 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
ROCOF Protection
Protection
[ANSI code]
Trip time t
t
Trip threshold
tolerance
(3)
Trip time tolerance
ROCOF [81R] t
t
= t28 ± 10 %
(6)
the best between ± 20% and 200 ms
Motor protections
Protection
[ANSI code]
Trip time t
t
Trip threshold
tolerance
(3)
Trip time tolerance
R JAM [51LR] t
t
= tj ± 10 % with If ≤ 6 In: ± 7 % / with If > 6 In: ± 10 %
R STALL [51LR] t
t
= ts ± 10 % ± 10 %
UC [37] t
t
= tuc ± 15 % ± 20 %
U t
t
= tu
(8)
± 15 % ± 20 %
Additional protections
Protection
[ANSI code]
Trip time t
t
(1)
Trip threshold
tolerance
(3)
Trip time tolerance
Gext
[50GTD / 51G]
t
t
= t41
(with curve t = k)
± 7 %
The best between ± 10% and 40 ms
(with curve t = k / I
2
)
± 15 %
Rc
[64 50N TD 87N]
t
t
= tdn -20 % ÷ 0
140 ms @ 0,06 s
(9)
950 ms @ 0,8 s
(9)
MDGF
t
t
= t41
(with curve t = k)
± 7 %
The best between ± 10% and 40 ms
(with curve t = k / I
2
)
± 15 %
Startup
Protection
[ANSI code]
Trip time t
t
(1)
Trip threshold
tolerance
(3)
Trip time tolerance
Gext StartUp t
t
= t41 startup ± 7 % the best between: ± 10 % and ± 40 ms
MDGF StartUp t
t
= t41 startup ± 7 % the best between: ± 10 % and ± 40 ms