- NSTALACIONES ELECTRICAS
Conjunto integrado por canalizaciones, estructuras, conductores, accesorios y dispositivos que permiten el suministro de energía eléctrica desde las centrales generadoras hasta el centro de consumo
Una instalación eléctrica se considera segura y eficiente si los productos empleados en ella están aprobados por las autoridades competentes, que esté diseñada para las tensiones nominales de operación. - OBJETIVO DE UNA INSTALACIÓN ELÉCTRICA
- Seguridad contra accidentes e incendios
- Eficiencia y economía
- Accesibilidad y distribución
- Mantenimiento
- TIPOS DE INSTALACIONES
Considerando las características de los locales o de las áreas donde se desarrollarán:
TOTALMENTE VISIBLES.- En este caso, todas las partes componentes de la instalación eléctrica se encuentran a la vista y sin ningún elemento que le sirva como protección contra esfuerzos mecánicos, ni como protección en contra del medio ambiente.
VISIBLES ENTUBADAS.- Las instalaciones eléctricas son así realizadas, ya que las estructuras de la construcción y el material de los muros impiden el ahogar las canalizaciones, en este caso si existe protección mecánica y contra los factores ambientales.
TEMPORALES.- Este tipo de instalaciones se construyen para abastecer de energía eléctrica por períodos de tiempo cortos, como es en el caso de ferias, carnavales, exposiciones, juegos mecánicos, servicios en obras en proceso, etcétera.
DE EMERGENCIA.- Cuando se requiere contar con suministro continuo de energía eléctrica, se coloca una planta de emergencia que generalmente se pone en operación automáticamente al faltar la energía que proporciona la compañía suministradora. Es muy usual encontrar este tipo de instalaciones en grandes centros comerciales, hospitales, teatros, cines y en industrias que cuentan con un proceso de fabricación continuó. - TIPOS DE INSTALACIONES
PARCIALMENTE OCULTAS.- Se localiza este tipo de instalación en naves industriales donde parte de la canalización va por pisos y muros y la restante por armaduras; en edificios de bancos, oficinas y centros comerciales que cuentan con falso plafón.
TOTALMENTE OCULTAS.- En este caso la instalación eléctrica presenta un muy buen acabado, ya que quedan visibles solamente las tapas de los tomacorrientes, de los interruptores y de los centros de carga o tableros. Poseen el grado más alto de estética cuando los accesorios son de buena calidad y presentación.
A PRUEBA DE EXPLOSION.- Las instalaciones eléctricas a prueba de explosión se construyen en los locales y ambientes donde existen polvos o gases explosivos, así como partículas en suspensión factibles de incendiarse. Las canalizaciones deberán cerrar herméticamente. Por ejemplo, se desarrollan este tipo de instalaciones en molinos de trigo, minas de tiro, gaseras, plantas petroquímicas, etc. - SIMBOLOGÍA
- SIMBOLOGÍA
- SIMBOLOGÍA
- SIMBOLOGÍA
- PARAMETROS A CONTROLAR EN LA ENERGÍA ELÉCTRICA
a) Factor de potencia
Este factor resulta de la comparación de la potencia aparente (KVA) con la potencia real (KW).
El sensado se lleva a cabo por medio de un medidor de desfasamiento entre voltaje y corriente.
b) Demanda (KW)
El pico de demanda máxima de potencia. Esta medición se hace continuamente por parte de la compañía suministradora y se registra el valor más alto de la demanda de todo el mes. En base a este valor máximo se calcula la facturación.
El sensado se lleva a cabo con un transductor de potencia que calcula la potencia instantáneamente, o en instalaciones con tarifa horaria por medio de conteo de pulsos del medidor instalado por la compañía suministradora.
c) Energía (KWh)
El método de control de energía más usado consiste en encender y apagar cargas por medio de un temporizador. Este "controlador" tendrá la tarea de eliminar el encendido y apagado manual de cargas, asegurando la repetibilidad y precisión. - METODOS DE MEDICIÓN DE LA ENERGÍA ELÉCTRICA
a) Energía:
Los KWh se miden por integración de la demanda a lo largo del tiempo. Los medidores mecánicos llevan a cabo esta integración por medio de un sistema de relojería que va desplazando unos engranes con indicadores durante el periodo de consumo.
b) Factor de potencia:
El f.p. es el resultado de dividir energía activa (KWh) y la energía aparente (la resultante de la potencia activa y la reactiva) acumuladas durante todo el periodo de consumo (típicamente un mes).
c) Demanda
La medición de la demanda es la más sofisticada, ( de aguja, de pulsos) - REQUISITOS DE LAS INSTALACIONES ELÉCTRICAS
Disposiciones Generales
Puesta a tierra de circuitos y sistemas eléctricos
Ubicación de las conexiones de puesta a tierra de los sistemas
Puesta a tierra de envolventes y canalizaciones
Puesta a tierra de los equipos
Métodos de puesta a tierra
Puentes de unión
BIENVENIDOS
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miércoles, 8 de diciembre de 2010
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