HT instruments FULLTEST3 User Manual
Page 36
FULLTEST
3
EN - 35
-
2, 4, 6, 8, 10, 12, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 160,
200, 250, 315, 400, 500, 630, 800, 1000 or 1250 A (FUSE gG)
- 2, 4, 6, 8, 10, 12, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 160,
200, 250, 315, 400, 500 or 630 A (FUSE aM)
- Tset (max trip time)
0.1, 0.2, 0.4 or 5 s
Ut - verification if short-circuit current is high enough over-current protection device to react within set
time.
On bases of entered over-current protection device (PROTECTION), nominal current of the over-current
protection device (In) and Tset required short-circuit current (Ia) is calculated. Measured I
SC MIN
must
be higher than or equal to calculated current Ia. Entered parameters can be selected among the
following values:
- PROT (type of protection)
MCB B, MCB C, MCB D, MCB K, FUSE gG or FUSE aM
- In (nominal current)
- 6, 10, 13, 16, 20, 25, 32, 40, 50 or 63 A (MCB B)
- 0.5, 1, 1.6, 2, 4, 6, 10, 13, 16, 20, 25, 32, 40, 50 or 63 A (MCB C)
- 0.5, 1, 1.6, 2, 4, 6, 10, 13, 16, 20, 25 or 32 A (MCB D, MCB K)
-
2, 4, 6, 8, 10, 12, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 160,
200, 250, 315, 400, 500, 630, 800, 1000 or 1250 A (FUSE gG)
- 2, 4, 6, 8, 10, 12, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 160,
200, 250, 315, 400, 500 or 630 A (FUSE aM)
- Tset (max trip time)
0.1, 0.2, 0.4, 5 or 10 s
5.6.3. PROSPECTIVE SHORT-CIRCUIT CURRENT CALCULATION
Evaluation table and short-circuit current calculation:
LIMIT mode TT – Evaluation condition
TN – Evaluation condition
L/L
STD
No evaluation
No evaluation
kA I
SC L/L MAX 3PH
< BC
I
SC L/L MAX 3PH
< BC
I
2
t (I
SC L/L MAX 3PH
)
2
× t
< (K × N × S)
2
(I
SC L/L MAX 3PH
)
2
× t
< (K × N × S)
2
TRIP CURR.
I
SC L/L MIN 2PH
Tmax, Tmax < Tlim
I
SC MIN 2PH
Trip time T, T < Tlim
Ut
L/N
STD
No evaluation
No evaluation
kA
ISC L/L MAX 3PH < BC
ISC L/L MAX 3PH < BC
I
2
t
(ISC L/N MAX)
2
× t
< (K × N × S)
2
(ISC L/N MAX)
2
× t
< (K × N × S)
2
TRIP CURR.
ISC MIN 2PH
Trip time T, T < Tlim
ISC MIN 2PH
Trip time T, T < Tlim
Ut
L/N
STD
No evaluation
No evaluation
kA
ISC MAX L/N < Breaking capacity
IB
ISC MAX L/N < Breaking capacity IB
I
2
t
(ISC MAX L/N)
2
× T
< (K × N × S)
2
(ISC MAX L/N)
2
× T
< (K × N × S)
2
TRIP CURR.
ISC MIN L/N
Trip time T, T <
Tlim
ISC MIN L/N
Trip time T, T < Tlim
L/PE
STD
No evaluation
No evaluation
kA
ISC MAX L/PE < Breaking capacity
IB
ISC MAX L/PE < Breaking capacity IB
I
2
t
(ISC MAX L/PE)
2
× T
< (K × N × S)
2
(ISC MAX L/PE)
2
× T
< (K × N × S)
2
TRIP CURR.
ISC MIN L/PE
Trip time T, T <
Tlim
ISC MIN L/PE
Trip time T, T <
Tlim
Ut
ISC MIN L/PE > N × In
ISC MIN L/PE > N × In