Short Circuit Calculations: Basic Calculations and Transformer Sizing

Short Circuit Capacity: Basic Calculations and Transformer Sizing

Short circuit efficiency computation is used for many natural coverings: size of it of transformers,

selecting the interrupting capacity ratings of circuit breakers and fuses, determining if a

line reactor is required for use with a uncertain frequency drive, etc.

The purpose of the presentation is to gain a radical understanding of short circuit capacity.

The application example utilizes transformer size for motor loads.

Conductor impedances and their associated voltage drop are ignored non only to present a

simplified illustration, but also to provide a method of approximation by which a plant

engineer, electrician or production manager provide be able to any evaluate a new application

or review an existing application problem and resolve the matter quickly.

Literature containing a detailed discussion of short circuit capacity calculations are

useable within the electrical index transmission industry. [1]

The following calculations will determine the extra kVA capacity required for a three

material body transformer that is used to feed a sensation three phase motor that is started with

full voltage applied to its terminals, or, across-the-line.

Two transformers will be discussed, the prototypic having an unlimited short circuit kVA

capacity available at its primary terminals, and the second having a much land input

short circuit capacity available.

kVA of a single phase transformer = V x A

kVA of a three phase transformer = V x A x 1.732, where 1.732 = the square settle of 3.

The square root of 3 is introduced for the reason that, in a three phase system,

the phases are 120 degrees apart and, therefore, can not be added arithmetically.

They will add algebraically.

Transformer Connected To Utility Power Line

The first transformer is rated 1000 kVA, 480 secondary volts, 5.75% impedance.

Rated full load amp widening of the transformer is

1000...

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