Electrical protection guide

This guide answers common questions about electrical protection.

It also explains what a UPS (uninterruptible power supply) actually is, and the technologies available on ours.

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What is a UPS?

What is a UPS? A UPS is not just designed to reduce outages. It also serves to stabilize the voltage and eliminate electrical parasitics. The UPS represents an important link when securing IT systems. Its main purpose it to take over from the wall outlet power during power cuts, providing users with time to save the work in progress. These appliances do not just deal with power cuts. Filtration, in addition to voltage regulation, form part of the important functions to be overseen. A good UPS must also ensure continual electricity supply to the appliances, as well as monitoring that the power is of a good quality. There are three parts to a UPS: The rectifier which transforms alternating current into direct current destined to charge the batteries and power the UPS. The batteries which store energy. The UPS which transforms the direct current delivered by the rectifier or the batteries into alternating current from 230 Volts to 50 Hz, identical to that of the wall outlet power. The UPS is also equipped with self-closing software: in the instance of a wall power outlet failure, this software (installed on the computer connected to the UPS) automatically closes all programs after having saved necessary items. HOW DO YOU SELECT YOUR UPS? Step 1 - Know how to calculate the power needed for your installation: Identify, for each appliance to be protected, the consumption in Amperes, in Watts or in VA. Total up the values identified (using these same values Select a UPS with power greater than the total of connected loads. Notes: If the values are expressed in Amperes, multiply by 230 to obtain the VA (Example: 7.5 A x 230 V = 1,725 VA). If the values are expressed in Watts, divide by 0.7 to obtain the VA The formulas: Apparent power = Voltage x VA Intensity = V x A Effective power = Apparent power/cos (power factor) W = VA/[coc (power factor)] Note: in general, it can be considered that cos (power factor) has a value of 0.70 It is important to ensure that the load supplied does not exceed the UPS capacity. Step 2 - Be able to select the technology suited to your installation: Available technologies