{"id":19317,"date":"2021-12-21T11:23:40","date_gmt":"2021-12-21T18:23:40","guid":{"rendered":"https:\/\/brainfiller.com\/?p=19317"},"modified":"2025-11-19T09:40:47","modified_gmt":"2025-11-19T16:40:47","slug":"how-to-perform-an-arc-flash-study-part-2-arcing-fault-current","status":"publish","type":"post","link":"https:\/\/brainfiller.com\/es\/electrical-safety-codes-and-standards\/how-to-perform-an-arc-flash-study-part-2-arcing-fault-current\/","title":{"rendered":"C\u00f3mo realizar un estudio de arco el\u00e9ctrico \u2013 Parte 2
Corriente de falla de arco"},"content":{"rendered":"
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Corriente de falla de arco: efecto de la separaci\u00f3n, el voltaje y la configuraci\u00f3n de los electrodos<\/strong><\/h2>

Un arco el\u00e9ctrico se produce cuando una corriente de cortocircuito atraviesa un espacio de aire entre conductores energizados. El evento normalmente es el resultado de un contacto inicial (e involuntario) entre conductores energizados que crea el cortocircuito. Durante el evento, los conductores o un objeto conductor pueden fundirse o volar hacia atr\u00e1s, lo que produce un espacio de aire. Cuando la corriente fluye a trav\u00e9s del espacio, ioniza el aire, lo que da como resultado un plasma conductor y una nube t\u00e9rmica. IEEE 1584 \u2013 Gu\u00eda IEEE para realizar c\u00e1lculos de riesgo de arco el\u00e9ctrico<\/em> se refiere a esto como el Corriente de falla de arco<\/em> que se define como:<\/p>

Una corriente de falla que fluye a trav\u00e9s de un plasma de arco el\u00e9ctrico. <\/em>Para calcular la corriente de falla de arco, las ecuaciones IEEE 1584 requieren muchas variables de entrada tales como: corriente de cortocircuito trif\u00e1sica, distancia de separaci\u00f3n de barras, configuraci\u00f3n de electrodos y voltaje.<\/p>

Distancia de separaci\u00f3n<\/strong><\/h2>

La distancia de separaci\u00f3n es la distancia f\u00edsica entre los conductores por los que fluye la corriente durante un arco el\u00e9ctrico. Medir la distancia de separaci\u00f3n real puede resultar poco pr\u00e1ctico, ya que requerir\u00eda evaluar cada equipo que pueda recibir energ\u00eda, lo que requiere que se lo coloque en una condici\u00f3n de trabajo el\u00e9ctricamente segura. Adem\u00e1s, puede haber varias distancias de separaci\u00f3n diferentes en el mismo equipo seg\u00fan d\u00f3nde se produzca el arco el\u00e9ctrico.<\/p>

\"\"<\/a>La norma IEEE 1584 proporciona un rango de distancias de separaci\u00f3n v\u00e1lidas de 0,25 pulgadas a 3 pulgadas para voltajes de 208 V a 600 V. La norma tambi\u00e9n enumera distancias de separaci\u00f3n t\u00edpicas para clases de equipos, como 1 pulgada (25 mm) para centros de control de motores y tableros de distribuci\u00f3n de bajo voltaje y 1,25 pulgadas (32 mm) para aparamenta de bajo voltaje. Estos valores se utilizan com\u00fanmente para estudios de arco el\u00e9ctrico en ausencia de mediciones. El problema de ejemplo utilizado para los c\u00e1lculos se defini\u00f3 en la Parte 1 de esta serie y se basa en una corriente de falla atornillada de 28.500 amperios a 480 voltios.<\/p>

Tabla 1<\/strong> En la figura se muestra la corriente de falla de arco calculada utilizando diferentes distancias de separaci\u00f3n. Se ilustra c\u00f3mo la corriente de arco aumenta a medida que la distancia de separaci\u00f3n disminuye y viceversa.<\/p>

Voltaje<\/strong><\/h2>

\"\"<\/a><\/p>

La magnitud de la corriente de falla por arco tambi\u00e9n depende del voltaje. A medida que el voltaje disminuye, la corriente de arco tambi\u00e9n disminuye, como se muestra en Tabla 2.<\/strong>\u00a0 La diferencia entre la corriente de falla de arco y la corriente de falla de descarga es mayor a voltajes m\u00e1s bajos. Esto se debe a que la impedancia equivalente de la corriente de falla de descarga es menor a voltajes m\u00e1s bajos, por lo que la impedancia del arco tiene un impacto m\u00e1s significativo.<\/p>

Configuraci\u00f3n de electrodos<\/strong><\/h2>

La introducci\u00f3n de diferentes configuraciones de electrodos fue una de las adiciones m\u00e1s significativas a la segunda edici\u00f3n de IEEE 1584. Se incluyen cinco configuraciones de electrodos diferentes y tres configuraciones utilizadas para equipos dentro de un gabinete. Estas incluyen: VCB: conductores verticales dentro de una caja de metal, VCBB: conductores verticales terminados en una barrera aislante dentro de una caja de metal y HCB: conductores horizontales dentro de una caja de metal. Art\u00edculo de febrero de 2019<\/a><\/span><\/strong> para obtener detalles sobre las configuraciones de electrodos.<\/p>

\"\"<\/a>IEEE 1584 proporciona cierta orientaci\u00f3n con respecto a la selecci\u00f3n de configuraciones de electrodos; sin embargo, depende de la persona calificada que realiza el estudio tomar la determinaci\u00f3n final.\u00a0 Tabla 3<\/strong> enumera los resultados de los c\u00e1lculos de corriente de arco para nuestro ejemplo utilizando diferentes configuraciones de electrodos. Es posible tener varias configuraciones de electrodos diferentes en un solo equipo seg\u00fan d\u00f3nde se produzca el arco el\u00e9ctrico. Adem\u00e1s, el hecho de que el equipo tenga una orientaci\u00f3n horizontal no significa autom\u00e1ticamente que la configuraci\u00f3n de electrodos sea HCB. HCB es para barras\/electrodos horizontales dirigidos al trabajador. De manera similar, si la barra del equipo est\u00e1 en orientaci\u00f3n vertical, eso no se traduce necesariamente en VCB o VCBB. \u00bfQu\u00e9 sucede si hay puntas apuntando hacia el trabajador desde la barra vertical? Eso puede dar como resultado una configuraci\u00f3n HCB.<\/p>

La configuraci\u00f3n de los electrodos afecta la trayectoria del arco y la impedancia del mismo. La VCBB produce la menor impedancia del arco debido a la concentraci\u00f3n de plasma en la barrera aislante y produce una mayor corriente de falla del arco. Cada configuraci\u00f3n de electrodos puede generar una corriente de arco, una energ\u00eda incidente y un l\u00edmite de arco el\u00e9ctrico diferentes.<\/p>

Los c\u00e1lculos para nuestro ejemplo de tablero de distribuci\u00f3n definido en la Parte 1 probablemente utilizar\u00edan tanto VCB como VCBB. \u00bfPor qu\u00e9? Cuando los conductores terminan en un dispositivo de protecci\u00f3n principal, como la parte superior de un panel, puede comportarse como una configuraci\u00f3n VCBB en esa ubicaci\u00f3n. Sin embargo, si se produce un arco el\u00e9ctrico en un dispositivo derivado, esto puede actuar m\u00e1s como VCB. \u00bfPor qu\u00e9 analizar ambos? Porque cualquiera de los dos podr\u00eda dar como resultado la energ\u00eda incidente del peor caso. Si la duraci\u00f3n del arco es la misma para cada caso, VCBB dar\u00e1 como resultado la mayor energ\u00eda incidente. Sin embargo, VCB puede dar como resultado una corriente de arco m\u00e1s baja que podr\u00eda hacer que un dispositivo de protecci\u00f3n aguas arriba demore m\u00e1s en funcionar. La mayor duraci\u00f3n del arco podr\u00eda dar como resultado una mayor energ\u00eda incidente para VCB.<\/p>

Este art\u00edculo se public\u00f3 originalmente en la edici\u00f3n de noviembre de 2021 de la revista Electrical Contractor.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

C\u00f3mo realizar un estudio de arco el\u00e9ctrico \u2013 Parte 2
Arcing Fault Current: Arcing Fault Current – Effect of Gap, Voltage and Electrode Configuration An arc flash occurs when short circuit current jumps across an air gap between energized conductors. 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