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UNIVERSIDAD NACIONAL PEDRO RUIZ GALLO FACULTAD DE ING. MECÁNICA Y ELÉCTRICA
UNIVERSIDAD NACIONAL “PEDRO RUIZ GALLO” FACULTAD DE INGENIERÍA MECÁNICA ELÉCTRICA
CURSO
LABORATORIO DE MEDIDAS CATEDRÁTICO
ING. OLIDEN NUÑEZ HECTOR
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UNIVERSIDAD NACIONAL PEDRO RUIZ GALLO FACULTAD DE ING. MECÁNICA Y ELÉCTRICA
LABORATORIO LABORATORI O DE MEDIDAS LABORATORIO Nº3: RESISTENCIA DE PUESTA A TIERRA 1.
OBJETIVOS:
Realizar la medición de la Resistencia de un Sistema de Puesta a Tierra, mediante el Telurómetro.
Conocer el manejo y la forma de conexión del Telurómetro para la medida de la resistencia.
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UNIVERSIDAD NACIONAL PEDRO RUIZ GALLO FACULTAD DE ING. MECÁNICA Y ELÉCTRICA
quedar bajo tensión ante una falla de aislamiento, como por ejemplo carcasas de máquinas, gabinetes de tableros eléctricos, bandejas porta cables, etc.
Para equipos electrónicos: Cumplen una función similar a la de protección y además permiten referir a potencial de tierra las masas de los equipos, evitando que su potencial “flote” con respecto a tierra y origine voltajes peligrosos para los
componentes electrónicos.
Para descargas por sobretensiones : utilizadas en los circuitos de pararrayos y descargadores de líneas y equipos.
Partes constitutivas de un sistema de PAT
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UNIVERSIDAD NACIONAL PEDRO RUIZ GALLO FACULTAD DE ING. MECÁNICA Y ELÉCTRICA
Resistividad según naturaleza del terreno
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UNIVERSIDAD NACIONAL PEDRO RUIZ GALLO FACULTAD DE ING. MECÁNICA Y ELÉCTRICA
En forma de placa: rectangular o circular, material cobre electrolítico.
Recomendable para terrenos donde la profundidad de la tierra vegetal es de 1,2 a 2 mts.
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UNIVERSIDAD NACIONAL PEDRO RUIZ GALLO FACULTAD DE ING. MECÁNICA Y ELÉCTRICA
Es importante aclarar que en la figura se aprecia que la tercera punta de prueba es un electrodo fijo y no removible, no solo es para mediciones iniciales sino también puede ser usado para corroborar mediciones anteriores o el estado de una puesta a tierra existente.
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Método de c uatro ter ter min minal ales es
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UNIVERSIDAD NACIONAL PEDRO RUIZ GALLO FACULTAD DE ING. MECÁNICA Y ELÉCTRICA
Recordamos que que el cuarto terminal en la figura constituye una barra de tierra existente y se colocan las otras tres puntas de pruebas para completar cuatro
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Se utiliza para medir la calidad de la instalación, y saber si los valores de resistividad son los adecuados. En caso contrario, se tratara la tierra con productos específicos
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