Selasa, 25 Desember 2012

How to choose transformer rating?



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 -
100244141
160390225
250609352
315767444
400974563
5001218704
6301535887
80019491127
100024361408
125030451760
160038982253
200048722816
250060903520
315076734436
Figure. 1 : Standard apparent powers for MV/LV transformers and related nominal output currents

3-phase transformer

The nominal full-load current In on the LV side of a 3-phase transformer is given by:


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)
  • In = kVA x 1.4
The IEC standard for power transformers is IEC 60076.


SOURCE: Schneider Electric
http://electrical-engineering-portal.com/how-to-choose-transformer-rating

Silahkan berikan komentar Anda di laman ini.
Tautan (live links) spam dalam komentar akan terhapus secara otomatis.
Jika ingin menyisipkan tautan silakan gunakan tag: <i rel="URL">URL ANDA</i>
Untuk menyisipkan judul, gunakan tag <b rel="h3">TEKS JUDUL ANDA DI SINI</b>
Untuk menyisipkan gambar, gunakan tag <i rel="image">Tulis URL GAMBAR Anda di sini </i>
Untuk menyisipkan kode, gunakan tag <i rel="code">Tulis KODE ANDA di sini</i>
Kode yang panjang bisa menggunakan tag <i rel="pre"> KODE PANJANG di sini</i>
Untuk menciptakan efek tebal gunakan tag <b>TEKS TEBAL ANDA DI SINI</b>
Untuk menciptakan efek tulisan miring gunakan tag <i>TEKS MIRING ANDA DI SINI</i>

/* */