Summary Table Of External Toroid Protections; Table Of Additional Function Of The Gext Protection - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

Continued from the previous page

Summary table of external toroid protections

ABB ANSI
(1)
Gext (t = k) 50GTD
Gext (t = k / I ) 51G
2
Rc 64 50NTD

Table of additional function of the Gext protection

ABB ANSI
(1)
Gext (Startup) -
(4)
Gext (SdZ) 68
(1)
ANSI / IEEE C37-2 encoding.
(2)
t calculation is valid for If values that have exceeded the trip threshold of the protection. Use fault current and threshold values expressed in In to
t
calculate t , as shown in the example.
t
(3) Tolerances valid with trip unit energized in service conditions or with auxiliary power supply, tripping time ≥ 100 ms, temperature and currents within
operating limits. If these conditions are not guaranteed, the threshold tolerance becomes: ± 15 % and tolerance tt becomes: ± 20 %.
(4)
Startup can be activated only with the function set to fixed time.
(5)
For the startup functions, the specified time is the period during which the protection with the different threshold remains active, calculated from
the moment the startup threshold is exceeded.
(6)
The maximum time permitted by the trip unit for type UL circuit-breakers is 0.4 s. If a higher value is entered, the protection trip unit will signal error
and force the parameter to 0.4 s.
(7)
Maximum tripping time.
104 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
Threshold
Threshold
tolerance
I41 = 0.1...1 In toroid
± 7 %
step = 0.001 In
I41 = 0.1...1 In toroid
± 7 %
step = 0.001 In
Idn = 3 - 5 - 7 - 10 -
-20 % ÷ 0
20 - 30 A
Threshold
I41 startup = 0.1...1 In toroid
step = 0.02 In toroid
Calculation
Time
formula t
(3)
t41 = 0.1...1 s
t
step = 0.05 s
(6)
t
t41 = 0.1...1 s t
t
step = 0.05 s I41)
(6)
tdn = 0.06 - 01
- 0.2 - 0.3 - 0.4 t
t
- 0.5 - 0.8 s
Threshold
Time
(5)
tolerance
(3)
t41 startup = 0.1...30 s
± 7 %
step = 0.01 s
t41 sdz= 0.04...0.2 s
± 7 %
step = 0.01 s
Calculation
example t
(2) (2)
t t
= t41 -
t = 0.32 s with:
= 2 / (If /
t
I41 = 0.8 In; t41 =
2
0.2 s; If = 2 In
= tdn -
Calculation
formula t
(3)
t
t = t41
t
t = 2 / (If / I41)
2
t
Ekip Touch protection trip unit | 14 - External toroid protections
ABB | SACE Emax 2
Tolerance t
(3)
t
The better of the
two values: ± 10 %
or ± 40 ms
± 15 %
140 ms @ 0.06 s
(7)
950 ms @ 0.8 s
(7)
Tolerance t
(3)
t
The better of the two
values: ± 10 % or ±
40 ms
-