HOW BIG IS TRANSFORMER FOR DEDICATED MOTOR START/RUN ?????
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- เผยแพร่เมื่อ 11 พ.ค. 2022
- Transformer sizing for a dedicated motor start /run service. This video displays the various steps are required to be followed for calculation of transformer size, deployed for a dedicated motor service only.
Key words: Motor starting current, power factor, KVA, KW, KVAR, Transformer overload capability etc. - วิทยาศาสตร์และเทคโนโลยี
Thank you sir very useful informations
Thank you very much
Good explanation..been searching sizing calculation for unit transformer of HV motor. The voltage drop I get was more than 20% if the transformer is sized at 1.2 times of motor rating..thanks a lot
1.5 times motor KVA should be adequate
Refer my video for more details
1.5 times is minimum Subject to low impedance . 2 to 2.5 times could be accepted if you go by standard transformer percentage impedance
Thank you.. I find 2.5 times is adequate to rectify the starting voltage drop as simulated using ETAP.
You are correct. I am an old timer and do not have ETAP but I use traditional manual spreadsheet calculations, aim for voltage at the motor not less than 80% and for DOL start transformer kVA size is about 2 - 2.5 times motor kW rating depending on actual motor locked rotor current and cable voltage drops (insignificant for MV motor but important for LV motor). The transformer acts like a poor mans reduced voltage starter.@@kucingpowergile
very hard to understand
If you kindly let me know the exact point i may help you