Motors up to 500 HP and 575 Volts
This program calculates voltage drop caused by the starting of motors at the substation transformer primary and secondary leads. Primary system impedance and transformer impedance is taken into account.
Secondary conductor impedance is not. Calculator allows use of a autotransformer reduced voltage starter and provides calculations based on tap setting.
Two calculators are provided. One is based on tables 430-150 & 430-151(B) from the NEC. The tables provide current ratings for motors up to 500HP and 575 Volts.
The other allows full use of motor nameplate data.
| Software: | Motor Voltage Drop Calculator – MS Excel Spreadsheet |
| Version: | – |
| Developer: | – |
| Size: | 74 Kb |
| Price: | – |
| Download: | Here 🔗 (Get Premium Membership) | Video Courses | Download Updates |
Please give access to a spread sheet for universal voltage drop calculation at transformer terminal for voltage upto 11 KV Motor upto 6 MW
Dear i want to use these excel formulas spreadsheet, how can i get access to this sheet please help me
South Sudan electricity corporation,Juba, power plant
Besides, the suggestion of Chirantan Gupta, Sourse is considered to be infinite, which is not the case always, threfore, Transient Reactance or Transient impedence of the Source also shall be considered to arrive at voltage drop. If all these parameters are considered then the drop will not be limited to rating of the motor/or small motors
Many thank to your help
There are some vital improvements required. Firstly, the Transformer impedance should have a facility for +ve tolerance of 7.5% since this calculation is mostly done at early stage, when Transformer procurement and testing has not been conducted. Secondly, the cable length and size is required in the mathematical model. Otherwise, we will never know the voltage drop at the motor terminal box. Thirdly, the remaining base load on the bus also needs to be modeled, since this affects the Transformer regulation and the violtage drop.
I believe this was modeled in a way that the regulation of transformer and its tap were already identified. I think this is something the author of this article must need to mention in this particular subject.
I think this calculator is good, you just need to know its limitation and you’ll just apply it based on limitation this can be used to.