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The Basics of Power Failures and Their Solutions

Session 8 - Distinguishing Between Different Power Protection Devices

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As outlined in the previous sessions, it is common practice to use UPS as a countermeasure against power disturbances. But for high voltage receiving applications, it is often possible to enter dual-power or redundant A/B power system contracts with power companies. In this case, since the probability of a complete power failure is reduced, specialized power protection equipment such as voltage dip compensators may be all that is needed.
SANYO DENKI’s voltage dip compensator delivers protection from both dips and interruptions while other power protection equipment handles only dips.

Differences Between Power Protection Equipment and UPSs

The main difference between our voltage dip compensator and UPSs is the energy storage device. As discussed, UPSs typically use lead-acid batteries, while the voltage dip compensators employ electric double-layer capacitors. Electric double-layer capacitors offer excellent instantaneous power supply and discharge, so they are used for devices that emit large power in a short time to mitigate the effects of dips and interruptions. Some manufacturers use electrolytic capacitors in their power protection equipment.

Also, although there are three types of UPS topologies, no manufacturers use double conversion online topology in power protection equipment, leaving just two topologies available. Typically speaking, most manufacturers use a passive standby topology for their devices, bringing with them 2 ms breaks. SANYO DENKI uses a parallel processing topology to completely eliminate transfer time. As explained in the fifth session on passive standby topology, a flicker lasting between 2 to 10 ms occurs when switching to inverter output. The parallel processing topology used by SANYO DENKI is recommended for electrical equipment that cannot withstand this disruption.

Now let's summarize the power supply devices and features we have learned so far.

Passive standby topology Double conversion online topology Parallel processing topology
Power consumption Low High Low
Output voltage regulation Good Very good Good
Protection from inrush current Good Poor Good
Protection from harmonics Poor Good Good
Uninterrupted transfer Poor Good Good
UPS Good Good Good
Power protection equipment Good - Very good
Voltage dip compensator Good - Very good

In this series, we learned about various types of power disturbances and how to counteract them. We hope you’ll use the knowledge acquired here to select the best power supply device that balances functionality and costs. Of course, if you have trouble selecting such equipment, do not hesitate to ask us.
Thank you for reading this series on the basics of power failures and their solutions.

Date of publication: November 7, 2017

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