Answer By true or false • The line-to-line short circuit is the highest short circuit current that can occur in a low voltage installation • A 3-phase bolted short-circuit is a short circuit of considerable impedance • The short circuit rating of an electrical equipment is the prospective symmetrical fault current at a nominal voltage to which an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria • If the total power of 3-phase motors running simultaneously is higher than 25 % of the total power of transformers, the influence of motors must be taken into account. • The motors concerned in short circuit calculations are the 3-phase motors only; single-phase-motor contribution being insignificant. Choose... Choose... Choose... Choose... Choose...
Answer By true or false • The line-to-line short circuit is the highest short circuit current that can occur in a low voltage installation • A 3-phase bolted short-circuit is a short circuit of considerable impedance • The short circuit rating of an electrical equipment is the prospective symmetrical fault current at a nominal voltage to which an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria • If the total power of 3-phase motors running simultaneously is higher than 25 % of the total power of transformers, the influence of motors must be taken into account. • The motors concerned in short circuit calculations are the 3-phase motors only; single-phase-motor contribution being insignificant. Choose... Choose... Choose... Choose... Choose...
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Transcribed Image Text:Answer By true or false
• The line-to-line short circuit is the highest short circuit current that can occur in a low voltage installation
• A 3-phase bolted short-circuit is a short circuit of considerable impedance
• The short circuit rating of an electrical equipment is the prospective symmetrical fault current at a nominal voltage to
which an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria
• If the total power of 3-phase motors running simultaneously is higher than 25 % of the total power of transformers, the
influence of motors must be taken into account.
• The motors concerned in short circuit calculations are the 3-phase motors only; single-phase-motor contribution being
insignificant.
• The breaking capacity of the circuit breaker must be less than the maximum three phase bolted short circuit that is
calculated at a certain point
• When short circuit occurs, the internal impedance causes voltage to drop from no-load condition (U_20) to bring it to Un
when the transformer delivers Isc. In normal conditions, this impedance limits the voltage to a value, given in multiples
of Un.
• Breaking Capacity is the level of current that the circuit breaker can interrupt without damaging itself electrically or
structurally and without causing an electric arc with unacceptable duration.
• A 3-phase bolted short circuit current results in a sudden raise in voltage
• To calculate the 3-phase bolted short circuit current at a certain point we should calculate first the impedance of all the
components downstream that point.
• The Bolted three phase short circuit is used to determine thermal withstand rating of the cables, and the breaking
capacity setting of a circuit breaker.
• Short circuit calculations must be done on each point of the installation to determine the nominal rating of the circuit
breakers.
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