ABB SACE Emax E1.2, Operating Instructions For The Design Engineer

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ABB | SACE Emax 2
104 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A Ekip Touch protection trip unit | 14 - External toroid protections
Continued from the previous page
Summary table of external toroid protections
ABB ANSI
(1)
Threshold
Threshold
tolerance
(3)
Time
Calculation
formula t
t
(2)
Calculation
example t
t
(2)
Tolerance t
t
(3)
Gext (t = k) 50GTD
I41 = 0.1...1 In toroid
step = 0.001 In
± 7 %
t41 = 0.1…1 s
step = 0.05 s
(6)
t
t
= t41 -
The better of the
two values: ± 10 %
or ± 40 ms
Gext (t = k / I
2
) 51G
I41 = 0.1...1 In toroid
step = 0.001 In
± 7 %
t41 = 0.1…1 s
step = 0.05 s
(6)
t
t
= 2 / (If /
I41) 2
t
t
= 0.32 s with:
I41 = 0.8 In; t41 =
0.2 s; If = 2 In ± 15 %
Rc 64 50NTD
Idn = 3 - 5 - 7 - 10 -
20 - 30 A
-20 % ÷ 0
tdn = 0.06 - 01
- 0.2 - 0.3 - 0.4
- 0.5 - 0.8 s
t
t
= tdn -
140 ms @ 0.06 s
(7)
950 ms @ 0.8 s
(7)
Table of additional function of the Gext protection
ABB ANSI
(1)
Threshold
Threshold
tolerance
(3)
Time
(5)
Calculation
formula t
t
(3)
Tolerance t
t
(3)
Gext (Startup)
(4)
-
I41 startup = 0.1...1 In toroid
step = 0.02 In toroid
± 7 %
t41 startup = 0.1…30 s
step = 0.01 s
t
t
= t41
The better of the two
values: ± 10 % or ±
40 ms
Gext (SdZ) 68 ± 7 %
t41 sdz= 0.04…0.2 s
step = 0.01 s
t
t
= 2 / (If / I41)
2
-
(1)
ANSI / IEEE C37-2 encoding.
(2)
t
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
calculate t
t
, as shown in the example.
(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.