What are load calculations for a transformer?

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Discussion Overview

The discussion revolves around load calculations for transformers in an industrial setting, specifically focusing on a 44 kV line distributed through multiple transformers with varying capacities (3750 kVA, 2500 kVA, and 1500 kVA). Participants explore the implications of these ratings and the method of load distribution among the transformers.

Discussion Character

  • Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the meaning of the transformer ratings and the load calculations associated with them.
  • Another participant explains that kVA is calculated as volts times amps, noting the use of three-phase systems and providing a formula for calculating maximum current in a transformer.
  • A third participant acknowledges the previous contributions with a simple expression of thanks.
  • Another participant mentions that the distribution of load on individual transformers depends on their rated power and impedance voltage, suggesting a reference for detailed calculations.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as participants provide different aspects of the topic without resolving the initial inquiry about load calculations and distribution.

Contextual Notes

Participants reference specific calculations and concepts, but the discussion lacks detailed assumptions or definitions that could clarify the calculations further.

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what are load calculations for a transformer?

A 44kv line is distributed into the industry using around 8 transformers 3750kva, 2500kva and 1500kva. What does this mean and what are the load calculations for this? Also how is it distributed?
 
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KVA is simply volts times amps. And, it's usually three-phase, so you divide the line-to-line voltage by the square root of 3 to find the line-neutral voltage. So, for example, if you have 44 kV into a 3750 kVA transformer, the maximum current will be 3750 / (44 / SQRT (3)) / 3 = 49.2 amps per phase primary current.
 


thank u...
 


Distribution of load on individual transformers is related to their rated power and impedance voltage. For detail calculation you can refer to Transformer Riddle No. 27 from http://electrical-riddles.com
 
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