{"id":38671,"date":"2024-07-01T11:54:27","date_gmt":"2024-07-01T18:54:27","guid":{"rendered":"https:\/\/brainfiller.com\/?p=38671"},"modified":"2025-11-21T14:24:51","modified_gmt":"2025-11-21T21:24:51","slug":"safety-by-design-a-technique-that-incorporates-hazard-analysis-and-risk-assessment","status":"publish","type":"post","link":"https:\/\/brainfiller.com\/es\/electrical-safety-codes-and-standards\/safety-by-design-a-technique-that-incorporates-hazard-analysis-and-risk-assessment\/","title":{"rendered":"Seguridad por dise\u00f1o: una t\u00e9cnica que incorpora an\u00e1lisis de peligros y evaluaci\u00f3n de riesgos"},"content":{"rendered":"
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Seguridad por dise\u00f1o: una t\u00e9cnica que incorpora an\u00e1lisis de peligros y evaluaci\u00f3n de riesgos<\/h2>\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
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La mayor\u00eda de los sistemas de energ\u00eda el\u00e9ctrica se consideran sistemas \u201cheredados\u201d, lo que significa que son m\u00e1s antiguos y es posible que no utilicen las \u00faltimas tecnolog\u00edas. Por el contrario, los sistemas m\u00e1s nuevos suelen adoptar una estrategia de dise\u00f1o que prioriza la seguridad el\u00e9ctrica. Este enfoque, conocido como Seguridad por dise\u00f1o<\/em>, implica la incorporaci\u00f3n de t\u00e9cnicas de an\u00e1lisis de peligros y evaluaci\u00f3n de riesgos desde la fase inicial de dise\u00f1o. Como resultado, se pueden realizar configuraciones de sistemas y opciones de equipos alternativos para mejorar la seguridad el\u00e9ctrica y reducir el riesgo y la exposici\u00f3n de los trabajadores el\u00e9ctricos. A continuaci\u00f3n, se presentan algunos ejemplos de estas estrategias.<\/p>

Configuraci\u00f3n alternativa del sistema<\/strong><\/p>

La eliminaci\u00f3n de peligros es la m\u00e1xima prioridad en la jerarqu\u00eda de m\u00e9todos de control de riesgos. Esto implica crear una condici\u00f3n de trabajo el\u00e9ctricamente segura seg\u00fan la norma NFPA 70E 120.6. Sin embargo, los requisitos operativos y de producci\u00f3n pueden dificultar esta tarea. Un dise\u00f1o que incluya redundancia puede ofrecer una mayor flexibilidad en las configuraciones operativas y mejorar la capacidad de desenergizar los sistemas, al tiempo que minimiza las interrupciones de la producci\u00f3n.<\/p>

Duraci\u00f3n del arco y aislamiento<\/strong><\/p>

La duraci\u00f3n de un arco el\u00e9ctrico afecta significativamente la energ\u00eda incidente. La duraci\u00f3n del arco el\u00e9ctrico se define t\u00edpicamente por el tiempo de despeje de un dispositivo de protecci\u00f3n aguas arriba ubicado fuera del mismo gabinete y que no se ve afectado por el arco el\u00e9ctrico. Si el dispositivo de protecci\u00f3n principal comparte un gabinete con dispositivos de derivaci\u00f3n o alimentaci\u00f3n, podr\u00eda producirse un arco el\u00e9ctrico en el gabinete en el lado de la l\u00ednea principal o una falla de arco del lado de la carga podr\u00eda escalar a una falla del lado de la l\u00ednea. En consecuencia, el dispositivo de protecci\u00f3n principal podr\u00eda no despejar el arco el\u00e9ctrico. Un dise\u00f1o alternativo aislar\u00eda el dispositivo de protecci\u00f3n principal lo suficiente para garantizar que no se vea afectado por los arcos el\u00e9ctricos aguas abajo.<\/p>

Fiabilidad: no es instant\u00e1nea<\/strong><\/p>

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

Para mejorar la confiabilidad, se pueden seleccionar equipos sin protecci\u00f3n instant\u00e1nea en el dispositivo de protecci\u00f3n principal. Esto permite que los alimentadores se disparen primero, minimizando la extensi\u00f3n de las interrupciones. Sin embargo, la demora potencialmente larga del dispositivo de protecci\u00f3n principal podr\u00eda resultar en una energ\u00eda incidente significativa. Para reducir temporalmente la duraci\u00f3n del arco, se pueden utilizar m\u00e9todos como interruptores de mantenimiento de reducci\u00f3n de energ\u00eda de arco. Esto se aborda en el C\u00f3digo El\u00e9ctrico Nacional 240.87, Reducci\u00f3n de energ\u00eda de arco, aplicable a dispositivos con clasificaciones de disparo de corriente continua de 1200 A y superiores.<\/p>

Puesta a tierra por impedancia<\/strong><\/p>

Las referencias t\u00e9cnicas sugieren que alrededor de 80% o m\u00e1s de todas las fallas involucran solo una fase. Este alto porcentaje se puede comparar con la analog\u00eda de una llanta pinchada: aunque un autom\u00f3vil tiene cuatro llantas, normalmente solo falla una a la vez. De manera similar, es m\u00e1s probable que se produzca una falla de fase a tierra que una falla trif\u00e1sica. Los c\u00e1lculos de energ\u00eda incidente que utilizan IEEE 1584 consideran los arcos el\u00e9ctricos como eventos trif\u00e1sicos. Incluso si un arco el\u00e9ctrico comienza como un evento monof\u00e1sico, puede escalar a un evento trif\u00e1sico debido a que el plasma conductor llega a otras fases. El uso de resistencias de conexi\u00f3n a tierra neutras, cuando lo permita el C\u00f3digo El\u00e9ctrico Nacional y sea apropiado para el dise\u00f1o, puede eliminar la probabilidad de arcos el\u00e9ctricos de fase a tierra.<\/p>

Equipo resistente al arco<\/strong><\/p>

Los equipos resistentes al arco el\u00e9ctrico est\u00e1n dise\u00f1ados para contener y redirigir la energ\u00eda del arco el\u00e9ctrico lejos de los trabajadores el\u00e9ctricos. Aunque no eliminan los arcos el\u00e9ctricos, protegen a los trabajadores si las puertas est\u00e1n bien cerradas. Una vez presenci\u00e9 la prueba de un tablero de distribuci\u00f3n resistente al arco de 15 kilovoltios en un laboratorio de alta potencia. A pesar de una explosi\u00f3n masiva y humo, la prueba se consider\u00f3 un \u00e9xito. Si un trabajador hubiera estado de pie frente al equipo, la energ\u00eda se habr\u00eda redirigido lejos de \u00e9l, lo que podr\u00eda haberle salvado la vida.<\/p>

Regreso al futuro<\/strong><\/p>

Como he estado involucrado en la capacitaci\u00f3n en electricidad durante m\u00e1s de cuatro d\u00e9cadas, he observado la evoluci\u00f3n de la seguridad el\u00e9ctrica. En los primeros d\u00edas de la capacitaci\u00f3n sobre arcos el\u00e9ctricos, predije que en el futuro se adoptar\u00edan m\u00e1s equipos resistentes a los arcos el\u00e9ctricos y t\u00e9cnicas de dise\u00f1o alternativas. Aunque hubo una resistencia inicial debido a preocupaciones por el costo, argument\u00e9 que si un dise\u00f1o o equipo alternativo pod\u00eda prevenir una lesi\u00f3n o una muerte, el costo estaba justificado. Explicar una decisi\u00f3n de este tipo a un jurado despu\u00e9s de un incidente ser\u00eda mucho m\u00e1s dif\u00edcil.<\/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":"

Safety by Design: A Technique That Incorporates Hazard Analysis and Risk Assessment Most electrical power systems are considered “legacy” systems, meaning they are older and may not utilize the latest technologies. 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