Presence of an Uninterruptible Power Supply (UPS): Difference between revisions
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The electrical power from a UPS is supplied from a storage unit: batteries or inertia wheel. This system prevent any power failure. The back-up time of the system is limited: from several minutes to several hours. | The electrical power from a UPS is supplied from a storage unit: batteries or inertia wheel. This system prevent any power failure. The back-up time of the system is limited: from several minutes to several hours. | ||
The simultaneous presence of a back-up generator and a UPS unit is used for permanently supply loads for which no failure is acceptable | The simultaneous presence of a back-up generator and a UPS unit is used for permanently supply loads for which no failure is acceptable ({{FigRef|D19}}). The back-up time of the battery must be compatible with the maximum time for the generator to start up and take over the load supply. | ||
A UPS unit is also used to supply loads that are sensitive to power quality (generating a “clean” voltage that is independent of the network). | A UPS unit is also used to supply loads that are sensitive to power quality (generating a “clean” voltage that is independent of the network). | ||
Main characteristics to be considered for implementing a UPS: | Main characteristics to be considered for implementing a UPS: | ||
* Sensitivity of loads to power interruptions (see [[Electrical installation characteristics|Voltage Interruption Sensitivity]] for definition), | |||
* Sensitivity of loads to power interruptions (see | * Sensitivity of loads to disturbances (see [[Electrical installation characteristics|Disturbance sensitivity]] for definition). | ||
* Sensitivity of loads to disturbances (see | |||
The presence of a UPS unit is essential if and only if no failure is acceptable. | The presence of a UPS unit is essential if and only if no failure is acceptable. | ||
{{FigImage|DB422133_EN|svg|D19|Example of connection for a UPS}} | |||
Latest revision as of 09:48, 22 June 2022
The electrical power from a UPS is supplied from a storage unit: batteries or inertia wheel. This system prevent any power failure. The back-up time of the system is limited: from several minutes to several hours.
The simultaneous presence of a back-up generator and a UPS unit is used for permanently supply loads for which no failure is acceptable (Fig. D19). The back-up time of the battery must be compatible with the maximum time for the generator to start up and take over the load supply.
A UPS unit is also used to supply loads that are sensitive to power quality (generating a “clean” voltage that is independent of the network).
Main characteristics to be considered for implementing a UPS:
- Sensitivity of loads to power interruptions (see Voltage Interruption Sensitivity for definition),
- Sensitivity of loads to disturbances (see Disturbance sensitivity for definition).
The presence of a UPS unit is essential if and only if no failure is acceptable.
