{"id":11156,"date":"2020-04-20T13:21:56","date_gmt":"2020-04-20T20:21:56","guid":{"rendered":"https:\/\/brainfiller.com\/?p=11156"},"modified":"2025-11-21T14:24:51","modified_gmt":"2025-11-21T21:24:51","slug":"plasma-modify-the-arc-rating-or-modify-the-incident-energy-calculations","status":"publish","type":"post","link":"https:\/\/brainfiller.com\/es\/electrical-safety-codes-and-standards\/plasma-modify-the-arc-rating-or-modify-the-incident-energy-calculations\/","title":{"rendered":"Plasma: \u00bfModificar la clasificaci\u00f3n del arco o modificar los c\u00e1lculos de energ\u00eda incidente?"},"content":{"rendered":"
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Plasma: \u00bfModificar la clasificaci\u00f3n del arco o modificar los c\u00e1lculos de energ\u00eda incidente?<\/strong><\/h2>

Con frecuencia me hacen preguntas sobre la aplicaci\u00f3n de la edici\u00f3n 2018 de IEEE 1584, especialmente sobre configuraciones de electrodos y, m\u00e1s espec\u00edficamente, sobre HCB (conductores\/electrodos horizontales dentro de una caja\/gabinete de metal).<\/p>

Recientemente tuve el privilegio de copresentar un art\u00edculo en el Taller de Seguridad El\u00e9ctrica del IEEE que se centr\u00f3 en los EPP, las clasificaciones de arco y el peligro de arco el\u00e9ctrico. A\u00f1ad\u00ed algo de \u00faltimo momento a la presentaci\u00f3n que no se incluy\u00f3 en el art\u00edculo publicado. Proporciona una correlaci\u00f3n directa entre el uso de la configuraci\u00f3n IEEE 1584 HCB 2018 y las conclusiones de un art\u00edculo t\u00e9cnico de 2010 sobre la reducci\u00f3n de la clasificaci\u00f3n de los EPP para los flujos convectivos externos durante un arco el\u00e9ctrico.<\/p>

El art\u00edculo IEEE-ESW 2010 de Lang, Jones y Neal se titula: Impacto de los eventos de arco el\u00e9ctrico con flujos convectivos salientes en las estrategias de protecci\u00f3n de los trabajadores<\/em>, y abord\u00f3 la cuesti\u00f3n de la ropa con clasificaci\u00f3n de protecci\u00f3n contra arcos el\u00e9ctricos que est\u00e1 sujeta a la energ\u00eda convectiva adem\u00e1s de la energ\u00eda radiante de un arco el\u00e9ctrico. El documento afirm\u00f3 que la energ\u00eda convectiva incluye la transferencia de calor debido al contacto directo con el plasma generado durante el arco el\u00e9ctrico.<\/p>

Est\u00e1 bien documentado que el rendimiento de algunas prendas con clasificaci\u00f3n de protecci\u00f3n contra arcos el\u00e9ctricos puede ser bastante diferente cuando se las somete directamente a flujos convectivos. Mis colegas que escribieron el art\u00edculo de 2010 realizaron muchas pruebas y proporcionaron un an\u00e1lisis detallado del comportamiento de los EPP. La conclusi\u00f3n fue que en algunos casos puede ser necesario ajustar la clasificaci\u00f3n de protecci\u00f3n contra arcos el\u00e9ctricos a la baja para tener en cuenta el diferente rendimiento en los flujos convectivos.<\/p>

Tabul\u00e9 sus hallazgos en la Tabla a continuaci\u00f3n. Los casos 1 y 2 ilustran dos configuraciones de EPP del art\u00edculo y las clasificaciones de arco correspondientes. El caso 1 tiene una clasificaci\u00f3n de 41 cal\/cm2<\/sup> y el caso 2 tiene una calificaci\u00f3n de 70 cal\/cm2<\/sup> como se muestra en la columna 3. La conclusi\u00f3n fue que si el material se colocaba en el flujo convectivo utilizando electrodos horizontales, ten\u00eda una clasificaci\u00f3n de arco efectiva de 21 y 35 cal\/cm.2<\/sup> respectivamente como se muestra en la columna 4.\"\"<\/a><\/p>

En los a\u00f1os posteriores al documento de 2010, las normas ASTM para pruebas de EPP y clasificaciones de arco se han mantenido fundamentalmente iguales.<\/p>

Perspectiva: \u00bfAjustar la clasificaci\u00f3n del arco o los c\u00e1lculos?<\/strong><\/h2>

Decid\u00ed analizar el tema desde una perspectiva diferente. En lugar de reducir la potencia del EPI, \u00bfqu\u00e9 pasar\u00eda si se ajustaran los c\u00e1lculos de energ\u00eda incidente? Eso es exactamente lo que plantea la edici\u00f3n 2018 de la norma IEEE 1584: Gu\u00eda IEEE para realizar c\u00e1lculos de riesgo de arco el\u00e9ctrico<\/em> Se trata de proporcionar diferentes opciones de modelado.<\/p>

Para ilustrar esta idea, realic\u00e9 c\u00e1lculos de energ\u00eda incidente en un sistema de 480 V con una corriente de cortocircuito de 50 000 amperios (50 kA). Se seleccion\u00e9 una distancia entre electrodos de 25 mm y una distancia de trabajo de 18 pulgadas, as\u00ed como una abertura de caja de 20 x 20 pulgadas.<\/p>

\"VCB<\/a>Para que la energ\u00eda incidente calculada coincida estrechamente con los valores de clasificaci\u00f3n de arco efectivo del documento de 2010 (columna 4), la variable m\u00e1s f\u00e1cil de ajustar fue la duraci\u00f3n del arco que se muestra en la columna 5. Los c\u00e1lculos se basan en el uso de la configuraci\u00f3n VCB (conductores\/electrodos verticales dentro de una caja\/gabinete de metal), que era la \u00fanica configuraci\u00f3n de gabinete disponible en el momento del documento de 2010. Los c\u00e1lculos resultantes que se muestran en la columna 7 son similares a las clasificaciones de arco efectivo que se muestran en la columna 4. La columna 6 muestra los c\u00e1lculos utilizando la edici\u00f3n 2002 de IEEE 1584.<\/p>

\"HCB<\/p>

Luego vino la parte interesante. Cambi\u00e9 la configuraci\u00f3n de cada c\u00e1lculo de VCB a HCB para representar la configuraci\u00f3n horizontal utilizada en el art\u00edculo de 2010. Estos resultados se muestran en la columna 8 e ilustran lo que sucede si se abordan los flujos convectivos modificando la configuraci\u00f3n de electrodos de los c\u00e1lculos de energ\u00eda incidente en lugar de ajustar la clasificaci\u00f3n de PPE. Me llev\u00e9 una agradable sorpresa (qued\u00e9 at\u00f3nito y pasmado tal vez ser\u00eda una descripci\u00f3n m\u00e1s apropiada) al descubrir que los resultados de HCB estaban muy cerca de las clasificaciones de arco de PPE originales en la columna 3.<\/p>

\u00bfQu\u00e9 significa todo esto? \u00a0<\/strong><\/h2>

En lugar de abordar el problema del flujo convectivo reduciendo la potencia del EPP, de estos dos ejemplos se desprende que la situaci\u00f3n se puede solucionar utilizando HCB, que no estaba disponible antes de 2018. En lugar de indicar un valor de 41 cal\/cm2<\/sup> La clasificaci\u00f3n de arco tiene una clasificaci\u00f3n efectiva de 21 cal\/cm2<\/sup> Cuando se somete a flujos convectivos, utilizando HCB para los c\u00e1lculos, se obtiene una energ\u00eda incidente de 42,40 cal\/cm2<\/sup> en lugar de 21,19 cal\/cm2<\/sup> con el VCB. El resultado indica una clasificaci\u00f3n de arco m\u00e1s alta que logra el mismo objetivo. Siempre puede haber un caso at\u00edpico, pero est\u00e1 bastante claro que mis amigos ten\u00edan algo de raz\u00f3n en 2010 con la reducci\u00f3n de la clasificaci\u00f3n de los EPI. Sin embargo, la \u00faltima edici\u00f3n de IEEE 1584 y HCB proporciona un m\u00e9todo para abordar la situaci\u00f3n desde la perspectiva del c\u00e1lculo de la energ\u00eda incidente en lugar de la reducci\u00f3n de la clasificaci\u00f3n de los EPI.<\/p>

Jim Phillips, PE, es el fundador de Brainfiller.com y ofrece capacitaci\u00f3n sobre energ\u00eda el\u00e9ctrica, arco el\u00e9ctrico y seguridad el\u00e9ctrica a nivel mundial. Sus cuatro d\u00e9cadas de experiencia incluyen la planificaci\u00f3n de sistemas de transmisi\u00f3n, el dise\u00f1o y an\u00e1lisis de sistemas de energ\u00eda industriales, comerciales y de servicios p\u00fablicos y el dise\u00f1o de plantas de cogeneraci\u00f3n. Es vicepresidente del grupo de trabajo sobre arco el\u00e9ctrico IEEE 1584, presidente internacional de IEC TC78 Live Working, comit\u00e9 directivo del proyecto de investigaci\u00f3n colaborativa sobre arco el\u00e9ctrico IEEE\/NFPA, miembro del comit\u00e9 t\u00e9cnico NFPA 70E y director asociado de Electrical Safety UK Ltd. Rotherham, Inglaterra<\/p>

Derechos de autor \u00a9 2020 | Jim Phillips, PE Brainfiller, Inc. | Todos los derechos reservados<\/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":"

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