IEEE Power & Energy Magazine - Spanish - July/August 2021 - 101

intermitente. La CA no parecía seguir
el mismo comportamiento que regulaba
a la CC. La reactancia capacitiva e
inductiva no se entendían bien en ese
tiempo y, en muchos casos, no se entendían
en absoluto.
P. N. Nunn, uno de los pioneros de
la CA que diseñó e instaló el proyecto
hidroeléctrico Telluride Power Co. en
Colorado, explicaba: " En 1890, la corriente
alterna era simplemente anómala;
no seguía la ley de Ohm y se 'atascaba'
en sus circuitos " . Además, estaba
el curioso caso de Sebastian Ziani de
Ferranti, ¡quien se encontró con problemas
donde la tensión en el extremo
receptor era mayor que en el extremo
de transmisión! ¿Cómo podía ser posible?
Con toda certeza, eso no ocurría
en los circuitos de CC. La respuesta no
era obvia en ese tiempo.
En ciertos casos, un concepto tan
básico como la ley de Ohm no se entendía
completamente. Harold W. Buck,
un eminente ingeniero eléctrico y expresidente
del AIEE, quien, en 1894, se
graduó de la Universidad de Yale, escribió
en 1901 en una publicación de AIEE
Transactions que " ... prácticamente no
ha habido daños con 11,000 voltios de
una leve corriente " . Y continúa: " ... con
6,600 voltios es indudable que un cortocircuito
haría pedazos el cable por una
mayor corriente " . Parece confundir la
situación de cortocircuito con el concepto
de potencia constante cuando se
trata de tensiones de transmisión.
En ese caso más bien forzado, se
requiere menos corriente para transmitir
un bloque determinado de potencia
cuando se utiliza un mayor tensión. Sin
embargo, suponer que una mayor tensión
aplicada a un cortocircuito producirá
menos corriente es una violación
flagrante de la ley de Ohm. Se podría
suponer que Buck lo sabía. Una revisión
de la sección de análisis de la publicación
que realizó este autor demostró
que nadie se lo había dicho.
Además, no había forma de registrar
eventos de tan corta duración durante
ese tiempo. Aun cuando se había inventado
el oscilógrafo a fines de la década
de 1890, pasarían unos años antes de
que fuera lo suficientemente sensible
julio/agosto 2021
ieee power & energy magazine
101
para registrar aproximadamente 1/25
a 1/60 de segundo. Esto hacía difícil
entender qué ocurría en un circuito
cuando un interruptor frenaba el flujo
de corriente. La figura 3 muestra la relación
de la tensión y la corriente cuando
se presenta una falla. Esto da alguna
idea de lo que los ingenieros enfrentaban
antes de que pudieran " ver " dichos
eventos complicados que ocurrían en
un espacio de tiempo tan breve, entre
2 y 4 ms.
No obstante, probablemente el mayor
problema era que los métodos de
http://varasset.com

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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IEEE Power & Energy Magazine - Spanish - July/August 2021 - Cover3
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