Fuji Electric BW32AAG - 3-7 Welder Circuit Applications

64
3
Selection and application
3-6 Applications on the primary side of transformers
Table 3-15

Selecting MCCB for transformer primary circuit (Three-phase)
Three-phase, 400-440V/210V Transformers
Transformer capacity (kVA) 0.5 1.0 1.5 2.0 3.0 5.0 7.5 10
In: Rated primary current (rms A) 0.7 1.3 2 2.6 3.9 6.6 9.8 13.1
Irush: Exciting inrush current (rms A) 15.4 30.8 46.3 61.7 92.5 154.2 231.3 308.4
Short-circuit
current at 440V
1.5 (kA)
BW32AAG–3P003 BW32AAG–3P005 BW32AAG–3P010 BW50SAT–3P015 BW32SAT–3P020
2.5 (kA) BW32SAG–3P003 BW32SAG–3P005 BW32SAG–3P010 BW50SAT–3P015 BW32SAT–3P020
7.5 ( kA) BW50SAG–3P005 BW50SAG–3P010 BW50SAT–3P015 BW50SAT–3P020
10 (kA) BW50RAG–3P010 BW50RAG–3P020 BW50RAG–3P040
18 (kA) BW125JAG–3P015
30 (kA) BW125JAG–3P015
36 (kA) BW125RAG–3P015
50 (kA) BW125RAG–3P015
65 (kA) BW50HAG-3P015
Transformer capacity (kVA)
15 20 30 50 75 100 150 200
In: Rated primary current (rms A)
19.7 26.2 39.4 65.6 98.4 131.2 196.8 262.4
Irush: Exciting inrush current (rms A)
462.5 616.7 708.6 1180.9 1771.4 2361.9 3542.8 4723.8
Short-circuit
current at 440V
1.5 (kA)
BW32SAT‒3P030 BW50SAT‒3P040 BW100EAT‒3P060 BW100EAT‒3P090 BW250EAT‒3P125 BW250EAT‒3P150 BW250EAT‒3P225 BW400EAT‒3P350
2.5 (kA)
BW32SAT‒3P030 BW50SAT‒3P040 BW100EAT‒3P060 BW100EAT‒3P090 BW250EAT‒3P125 BW250EAT‒3P150 BW250EAT‒3P225 BW400EAT‒3P350
7.5 ( kA)
BW32SAT‒3P030 BW50SAT‒3P040 BW100EAT‒3P060 BW100EAT‒3P090 BW250EAT‒3P125 BW250EAT‒3P150 BW250EAT‒3P225 BW400EAT‒3P350
10 (kA)
BW50RAG‒3P050 BW100EAG‒3P060 BW100EAT‒3P060 BW100EAT‒3P090 BW250EAT‒3P125 BW250EAT‒3P150 BW250EAT‒3P225 BW400EAT‒3P350
18 (kA)
BW125JAG‒3P060 BW125JAT‒3P060 BW125JAT‒3P090 BW250EAT‒3P125 BW250EAT‒3P150 BW250EAT‒3P225 BW400EAT‒3P350
30 (kA)
BW125JAG‒3P060 BW125JAT‒3P060 BW125JAT‒3P090 BW250RAT‒3P125 BW250RAT‒3P150 BW250RAT‒3P225 BW400EAT‒3P350
36 (kA)
BW125RAG‒3P060 BW125RAG‒3P100 BW250RAT‒3P125 BW250RAT‒3P125 BW250RAT‒3P150 BW250RAT‒3P225 BW400RAT‒3P350
50 (kA)
BW125RAG‒3P060 BW125RAG‒3P100 BW250RAT‒3P125 BW250RAT‒3P125 BW250RAT‒3P150 BW250RAT‒3P225 BW400RAT‒3P350
65 (kA)
BW125HAG-3P060 BW125HAG‒3P100 BW250HAG‒3P150 BW250HAG‒3P225 BW400HAG‒3P300 BW630HAG‒3P500 −
Note: Peak inrush current used in calculations: 20kVA max.: 23.5 times the rated
current,20kVAmin.:18timestheratedcurrent
Three-phase, 200-220V/105V Transformers
Transformer capacity (kVA) 0.5 1.0 1.5 2.0 3.0 5.0 7.5 10
In: Rated primary current (rms A) 1.312 2.624 3.936 5.249 7.873 13.122 19.682 26.243
Irush: Exciting inrush current (rms A) 30.836 61.672 92.507 123.343 185.015 308.358 462.536 616.715
Short-circuit
current at 220V
2.5 (kA)
BW32AAG–3P005 BW32AAG–3P010 BW32AAG–3P015 BW32SAT–3P015 BW32SAT–3P020 BW32SAT–3P030 BW50SAT–3P040
5 (kA) BW32SAG–3P005 BW32SAG–3P010 BW32SAG–3P015 BW32SAT–3P015 BW32SAT–3P020 BW32SAT–3P030 BW32SAT–3P040
10 (kA) BW50SAG–3P010 BW50SAG–3P015 BW50SAT–3P015 BW50SAT–3P020 BW50SAT–3P030 BW50SAT–3P040
25 (kA) BW50RAG–3P010 BW50RAG–3P015 BW50RAG–3P020 BW50RAG–3P040 BW50RAG–3P050 BW100EAG–3P060
36 (kA) BW125JAG–3P015 BW125JAG–3P060 BW125JAT–3P060
50 (kA) BW125JAG–3P015 BW125JAG–3P060 BW125JAT–3P060
85 (kA) BW125RAG–3P015 BW125RAG–3P060 BW125RAG–3P100
100 (kA) BW125RAG–3P015 BW125RAG–3P060 BW125RAG–3P100
125 (kA) BW50HAG-3P015 BW125HAG–3P060 BW125HAG–3P100
Transformer capacity (kVA) 15 20 30 50 75 100 150 200
In: Rated primary current (rms A) 39.365 52.486 78.730 131.216 196.824 262.432 393.648 524.864
Irush: Exciting inrush current (rms A) 925.073 1233.430 1417.132 2361.887 3542.831 4723.775 7085.662 9447.550
Short-circuit
current at 220V
2.5 (kA)
BW50SAT–3P050 BW100EAT–3P075 BW100EAT–3P100 BW250EAT–3P150 BW400EAT–3P250 BW400EAT–3P300 −−
5 (kA)
BW50SAT–3P050 BW100EAT–3P075 BW100EAT–3P100 BW250EAT–3P150 BW400EAT–3P250 BW400EAT–3P300 −−
10 (kA)
BW50SAT–3P050 BW100EAT–3P075 BW100EAT–3P100 BW250EAT–3P150 BW400EAT–3P250 BW400EAT–3P300 −−
25 (kA)
BW100EAT–3P060 BW100EAT–3P075 BW100EAT–3P100 BW250EAT–3P150 BW400EAT–3P250 BW400EAT–3P300 −−
36 (kA)
BW125JAT–3P060 BW125JAT–3P075 BW125JAT–3P090 BW250EAT–3P150 BW400EAT–3P250 BW400EAT–3P300 −−
50 (kA)
BW125JAT–3P060 BW125JAT–3P075 BW125JAT–3P090 BW250RAT–3P150 BW400EAT–3P250 BW400EAT–3P300 −−
85 (kA)
BW250RAG–3P125 BW250RAT–3P125 BW250RAT–3P150 BW400RAT–3P250 BW400RAT–3P300 −−
100 (kA) BW250RAG–3P125 BW250RAT–3P125 BW250RAT–3P150 BW400RAT–3P250 BW400RAT–3P300 −−
125 (kA) BW250HAG–3P125 BW250HAG–3P175 BW400HAG–3P250 BW400HAG–3P300 BW630HAG–3P500 BW630HAG–3P600 −−
Note: Peak inrush current used in calculations: 20kVA max.: 23.5 times the rated
current,20kVAmin.:18timestheratedcurrent
3-6-3 Transformer primary-side circuit selection
Selection is performed based on the exciting inrush current of
the 440V terminals for a primary rated voltage of 400V to 440V
(220V terminals for primary rated voltage of 200V to 220V)
and 50Hz for a 50Hz/60Hz transformer.
Reason: The exciting inrush current decreases
as the frequency rises. The current also
decreases as the voltage decreases.
Therefore, the breaker may operate
incorrectly due to the large exciting
inrush current if a voltage is applied
without a load and the power supply
voltage is higher than the rated terminal
voltage at 50Hz.
Selection conditions: Exciting inrush current (Effective value
conversion = Rated current x Peak
exciting inrush current factor) < MCCB
instantaneous tripping current (effective
value at 0.01 s).