Chapter 7 of a forthcoming book, Recommended Methods for Calculating AC Short-Circuit Currents in Industrial and Commercial Power Systems (IEEE Violet . dards known as Color Books used to be the premier Color Book included nearly complete information needed for the Violet Book, IEEE Standard The IEEE Color Books are developed and revised by the technical committees of the IEEE Violet Book™— IEEE STD ™, Recommended Practice for.
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IEEE Standards documents are developed within the IEEE Societies and the More than any other book in the IEEE Color Book® series, the “Violet Book”. Recognized as an. American National Standard (ANSI). IEEE Std ™ IEEE Recommended Practice for Calculating Short-Circuit. Currents in Industrial . their IEEE Standard number and their IEEE Book Color with the summary following. .. The IEEE Violet Book covers in more detail the basics and understanding.
Without any ac decay current, the first cycle and interrupting time calculations use the same impedance network and therefore the symmetrical currents are the same. This chapter is limited to the consideration of short-circuit currents that occur under the following conditions: 1 Short-circuit fault currents that occur in low-voltage ac systems and medium- voltage ac systems operating at a constant frequency and electrically remote from any generators.
In addition, system impedances remain constant. Unbalanced faults are covered in Chapter The application and selection 1The numbers in brackets correspond to those of the bibliography in 4.
No ac decay calculations are the simplest of the fault calculations and will serve as the basis for the more complex fault current calculations.
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Fault currents with ac decay are covered in Chapter 5 and Chapter 6. Hand calculations will be made at several locations and computer- generated results will be given for selected other buses.
These are as follows: 1 The pre-fault bus voltage is 1. To determine if the current calculated by the simplified methods meets these criteria, most of the effort that is needed for the detailed ANSI calculation is already done.
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Because having several methods to calculate breaker duty current could lead to confusion, the detailed ANSI calculation will be used here.
In this chapter, the symmetrical ac component of the short-circuit current has a constant rms magnitude for the duration of the fault.
A fault current flowing from a remote source may be asymmetrical and have both an ac and a dc component. The dc component is a transient and decays with time, while the ac component is a constant- amplitude sinusoid. In Chapter 2, several different theoretical and empirical equations were given that relate the maximum peak and rms currents in the first cycle to the ac symmetrical current.
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To help the reader, the same one-line diagram that is used in several of the other color books is used in sample calculations. Please choose whether or not you want other users to be able to see on your profile that this library is a favorite of yours. In Chapter 2, several different theoretical and empirical equations were given that relate the maximum peak and rms currents in the first cycle to the ac symmetrical current.