When an installation is to be supplied directly from a
MV/LV transformer and the maximum apparent-power loading of the installation has been determined, a suitable rating for the transformer can be decided, taking into account the following considerations:
The possibility of improving the
power factor of the installation (see chapter L)
Anticipated extensions to the installation
Installation constraints (e.g. temperature)
Standard transformer ratings
Apparent power [kVA] | In (A) |
| - 237V - | - 410V - |
100 | 244 | 141 |
160 | 390 | 225 |
250 | 609 | 352 |
315 | 767 | 444 |
400 | 974 | 563 |
500 | 1218 | 704 |
630 | 1535 | 887 |
800 | 1949 | 1127 |
1000 | 2436 | 1408 |
1250 | 3045 | 1760 |
1600 | 3898 | 2253 |
2000 | 4872 | 2816 |
2500 | 6090 | 3520 |
3150 | 7673 | 4436 |
Figure. 1 : Standard apparent powers for MV/LV transformers and related nominal output currents
3-phase transformer
where:
- Pa = kVA rating of the transformer
- U = phase-to-phase voltage at no-load in volts (237 V or 410 V)
- In is in amperes
Single-phase transformer
For a single-phase transformer:
where
- V = voltage between LV terminals at no-load (in volts)
Simplified equation for 400 V (3-phase load)
The IEC standard for power transformers is
IEC 60076.
SOURCE: Schneider Electric
http://electrical-engineering-portal.com/how-to-choose-transformer-rating
MAAF, saat ini kolom komentar sudah tidak bisa berfungsi dengan baik karena adanya perubahan struktur kode pada template blog ini.
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