What is an Uninterruptible Power Supply System-explained?
Uninterruptible power supply (UPS) system is an emergency backup power source usually consisting of lead acid batteries supporting power electronics that converts incoming AC to DC output current to support a specified load.
The UPS will provide No BREAK power to the downstream load for a number of minutes during which its stored electrical power will be provided until the GRID power is reinstituted.
Commonly used UPS systems
Two types of commonly used UPS systems are either, double-conversion or line-interactive. Both use a rectifier and then an inverter to get the AC back to a DC supply.
The more robust UPS are double conversion. As these are permanently provided power, rather than line interactive UPS that ‘spring to life in micro seconds’ when the UPS sees no GRID power.
Line interactive do have a micro break in power whereas a Double conversion have NO BREAK.
Double Conversion Uninterruptible power supply (UPS) systems are better to protect IT loads.
All UPS systems synchronize the output frequency with the input by means of built in Automatic voltage regulators (AVRs)
Every Generator also has an automatic voltage regulator (AVR) to keep the output power at 50hz. Should the power fluctuate , it is the AVR that keeps the output power between 49.5 and 50hz.
This range of 49.5hz to 50hz needs maintenance. Ensuring your load doesn’t lose power even if your emergency power system is still providing electrical power.
Frequency is important.
An automatic voltage regulator (AVR) keeps the output power frequency at 50hz and no lower than 49.5 hz.
Should the frequency drop out of this range, your emergency power from the UPS and Generator will be of no use. Your load will drop out and lose power.
Service & maintenance
Ensure regular service & maintenance regimes are in place for both your Uninterruptible power supply (UPS) systems and back up generators to prevent loss of frequency/power.
For design, equipment and installation of uninterruptible power
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