IEEE Power & Energy Magazine - Spanish - July/August 2021 - 100

expandía el negocio de la tracción,
esto no representaba problemas.
La CC era fácil de comprender.
Seguía las leyes de Ohm y Kirchoff,
y varios otros teoremas de redes. La
CC y la tensión se calculaban fácilmente
en cualquier momento en una
red. Los fusibles y interruptores se
utilizaban ampliamente para proteger
los circuitos y equipos, y en su mayor
parte, eso funcionaba bien. Incluso los
arcos de CC más viciosos podían extinguirse,
normalmente alargándolos
lo suficiente. Esto podía realizarse con
un soplado magnético. Por lo general,
las tensiones no eran mayores a 600 V
de CC. Las corrientes de falla no eran
excesivas, debido a que era común la
idea de " una máquina, un circuito " .
Incluso cuando se conectaban vafigura
1. Un motor alternativo a vapor en la estación eléctrica de la Calle 74
del Ferrocarril Urbano Metropolitano de Manhattan puesto en servicio en 1902
[Fuente: " The Electrical Equipment of the Manhattan Railway " (El equipo eléctrico
del ferrocarril Manhattan), Street Railway Review, vol. 12, n.° 2, pág. 98, 1902].
rias máquinas de CC a un nodo de la
estación, las estaciones generadoras
no se interconectaban. Charles Steinmetz,
quien escribió sobre los cortocircuitos
en las redes de CC en una
publicación de AIEE Transactions,
sostuvo lo siguiente en 1920:
En los antiguos sistemas generadores
de corriente continua
de 250 voltios, a partir de los
cuales se han desarrollado la
mayoría de los grandes sistemas
metropolitanos, la subdivisión
en una serie de estaciones generadoras
limitó la potencia que
podía desarrollarse en cualquier
momento, y por consiguiente su
capacidad de destrucción, por la
resistencia de los alimentadores.
Con la CA ocurrió una historia diferente.
Durante ese tiempo, la ingeniería
figura 2. Las turbinas a vapor de la estación de la Calle Fisk en servicio hacia
1907. Debido a su posición vertical, es posible notar su parecido con una turbina
hidráulica [Fuente: Western Electrician, " Fisk Street Station of the Commonwealth
Electric Company " (Estación de Fisk Street de la Commonwealth Electric
Company), Western Electrician, vol. 38, n.° 1, pág. 1 de ene. de 1906].
100
ieee power & energy magazine
eléctrica solo había sido reconocida
recientemente como una disciplina
separada. Muchos ingenieros eléctricos
se habían iniciado en la disciplina
mecánica o civil. Incluso para los
ingenieros eléctricos muy respetados
hubo grandes brechas en cuanto al conocimiento
teórico. Pocos comprendieron
completamente lo diferente
que era la CA de la CC. Era diferente
no solo a nivel de corriente de cortocircuito
disponible, sino también en
cuanto a la sobretensión que podía
producirse por una corriente de falla
julio/agosto 2021

IEEE Power & Energy Magazine - Spanish - July/August 2021

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IEEE Power & Energy Magazine - Spanish - July/August 2021 - Cover1
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