Difference between revisions of "Surge loads/es"

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[[File:Surgeloads.png|thumb|Ejemplo de motor con correa y polea en reposo. Se requiere corriente adicional para que se mueva inicialmente.]]
 
[[File:Surgeloads.png|thumb|Ejemplo de motor con correa y polea en reposo. Se requiere corriente adicional para que se mueva inicialmente.]]
  
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Surge loads are loads that require an additional surge of current (inrush current) for a brief period upon starting, typically a few hundred milliseconds and at most a few seconds. This additional current is required to charge capacitors or to physically start a motor that is at rest. Once the capacitors are charged or the motor is spinning the amount of current to keep the capacitors charged or the motor spinning is much less. Common surge loads include refrigerators, compressors, fans, power tools and blenders. The current that a surge load requires could be as much five times as much the standard current draw for the load. On appliance or motor labels the surge requirement will be expressed as Locked Rotor Amps (LRA), although many surge loads do not include this information. If it is not possible to find information about the LRA for an appliance, then a common value of 3 times operating current may be used for design purposes.
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Las cargas con corrientes de arraque requieren una oleada adicional de corriente (corriente in-rush) durante un breve período al arrancar, normalmente unos cientos de milisegundos y como máximo unos pocos segundos. Esta corriente adicional es necesaria para cargar condensadores o para arrancar físicamente un motor que está en reposo. Una vez que los condensadores están cargados o el motor gira, la cantidad de corriente para mantener los condensadores cargados o el motor gira es mucho menor. Las cargas de con corrientes de arranque comunes incluyen refrigeradores, compresores, ventiladores, herramientas eléctricas y licuadoras. La corriente que uno requiere podría ser hasta cinco veces mayor que el consumo de corriente estándar de la carga que se encuentra en la etiquetas del aparato o motor. Si la etiqueta de un aparato tiene información sobre la corriente de arranque - no es muy común - a menudo se expresará como "Locked rotor amps (LRA)." Si no es posible encontrar información en la etiqueta o del fabricante, comúnmente se usa un valor de 3 veces la corriente de operación para el analisis de cargas.
  
 
The short duration of the required surge of current does not have an impact on energy consumption and therefore isn’t relevant to sizing the [[Special:MyLanguage/PV module|PV source]] or [[Special:MyLanguage/Energy storage|energy storage system]]. The surge of current is only relevant when sizing and selecting an [[Special:MyLanguage/Inverter|inverter]] for a project as the inverter must have the capacity to supply this brief surge while still continuing to run critical loads – like a refrigerator – otherwise the inverter be overloaded and will shut down each time the surge load starts. For projects with infrequently used loads that have a large surge requirement it may make sense not to size and select an inverter to enable all loads to run at the same time. Shedding loads (turning off) some loads when one desires to use the load with the large surge requirement may greatly reduce the inverter size and cost.
 
The short duration of the required surge of current does not have an impact on energy consumption and therefore isn’t relevant to sizing the [[Special:MyLanguage/PV module|PV source]] or [[Special:MyLanguage/Energy storage|energy storage system]]. The surge of current is only relevant when sizing and selecting an [[Special:MyLanguage/Inverter|inverter]] for a project as the inverter must have the capacity to supply this brief surge while still continuing to run critical loads – like a refrigerator – otherwise the inverter be overloaded and will shut down each time the surge load starts. For projects with infrequently used loads that have a large surge requirement it may make sense not to size and select an inverter to enable all loads to run at the same time. Shedding loads (turning off) some loads when one desires to use the load with the large surge requirement may greatly reduce the inverter size and cost.

Revision as of 15:43, 15 March 2021

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Ejemplo de motor con correa y polea en reposo. Se requiere corriente adicional para que se mueva inicialmente.

Las cargas con corrientes de arraque requieren una oleada adicional de corriente (corriente in-rush) durante un breve período al arrancar, normalmente unos cientos de milisegundos y como máximo unos pocos segundos. Esta corriente adicional es necesaria para cargar condensadores o para arrancar físicamente un motor que está en reposo. Una vez que los condensadores están cargados o el motor gira, la cantidad de corriente para mantener los condensadores cargados o el motor gira es mucho menor. Las cargas de con corrientes de arranque comunes incluyen refrigeradores, compresores, ventiladores, herramientas eléctricas y licuadoras. La corriente que uno requiere podría ser hasta cinco veces mayor que el consumo de corriente estándar de la carga que se encuentra en la etiquetas del aparato o motor. Si la etiqueta de un aparato tiene información sobre la corriente de arranque - no es muy común - a menudo se expresará como "Locked rotor amps (LRA)." Si no es posible encontrar información en la etiqueta o del fabricante, comúnmente se usa un valor de 3 veces la corriente de operación para el analisis de cargas.

The short duration of the required surge of current does not have an impact on energy consumption and therefore isn’t relevant to sizing the PV source or energy storage system. The surge of current is only relevant when sizing and selecting an inverter for a project as the inverter must have the capacity to supply this brief surge while still continuing to run critical loads – like a refrigerator – otherwise the inverter be overloaded and will shut down each time the surge load starts. For projects with infrequently used loads that have a large surge requirement it may make sense not to size and select an inverter to enable all loads to run at the same time. Shedding loads (turning off) some loads when one desires to use the load with the large surge requirement may greatly reduce the inverter size and cost.

Notes/references

Locked Rotor Amps (LRA) Calculator https://generators.smps.us/surge-current-calculator.html

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