classic | mobile
Follow us on:
Follow us on Facebook  Share via Twitter  Share via LinkedIn
 

Search...
Hi-Tech Security Solutions Business Directory
Residential Estate Security Handbook 2018


Essential backup power equipment
September 2017, This Week's Editor's Pick, Security Services & Risk Management, Residential Estate (Industry)

Planning for unexpected power outages has become an essential part of any security strategy. While the primary types of equipment available for supplying backup power haven’t change much in the last few years, continual technological advances mean that some equipment becomes more relevant than others, depending on the subtleties of their operation.

The UPS is the main backup power mainstay, and is differentiated between off-line and on-line models, as Eurobyte Technology’s Neal Thomas describes: “With an off-line UPS, as the name suggests, the inverter module is off-line and does not feed any power to the protected device. The batteries are however connected to the mains power so they stay charged at all times in the event that there is a power failure. Because the inverter module is not feeding power to the protected device, it is not protecting it from other power issues such as power spikes. Once the power goes off there is a slight delay for the inverter to respond, usually between 2 to 10 milliseconds which could adversely affect sensitive electronics.

“An on-line UPS is always on-line and acts as a buffer between the main power and the powered devices. This regulates the electrical flow from the mains to the devices, which also protects them in the event of power spikes and brownouts. Because this unit is always on-line it means there is no switchover time from the UPS once the mains go out and your electronic devices are not affected by any form of a switchover.

“Lastly we have the line interactive UPS, which uses bits of the technologies from both the off-line and on-line UPS. This allows it to function in the same way as an off-line UPS with the difference that it incorporates a voltage regulator which helps to protect devices from more than just power failures, but also against power spikes and brownouts which we experience frequently in South Africa.”

Legrand South Africa is another company that supplies UPSes and related backup power equipment, and the company’s Marius Labuschagne summarises the differences between on-line and off-line models by saying that “Generally on-line UPSes, unlike off-line alternatives, are expensive and inefficient as the inverter is continuously in operation, however it provides better quality of power as compared to an off-line UPS.”

Further exploring inverter technology, Labuschagne explains that the role of the inverter is to take the utility’s pure AC sine wave and convert it into DC in order to charge batteries. The DC is then rectified back into AC, and two main types of rectifiers are available for this step. “Firstly, square wave rectifiers are a cost effective solution to achieve AC. However, the voltage is not ramped on a smooth curve but instead is pulsed on and off at a frequency of 50 to 60 Hz, thus producing a square waveform. Though this technology works well for the majority of electrical goods, unfortunately certain electronics depend on a smooth sine wave and may not function correctly with the square wave.

“This brings us to the second type: the true or pure sign wave rectifier. The advanced electronics used in these are more costly, but the stable waveform offers high-end electronics and sensitive equipment a true, smoothly ramped sine wave.”

When it comes to longer-term power outages, a generator is the go-to solution, and should always be specified at a higher power rating than the UPS that is being used, according to Thomas. “The reason for this is that the generator is running to your devices through the UPS, so if you are using a generator that has a lower power rating you will still be running down the UPS battery and this could cause damage to your UPS, and in turn damage the electronic devices you are trying to power. Also keep in mind that the generator should have a built in voltage regulator to ensure that the power coming through is clean, so as not to damage the electronic devices – this is also where your choice of UPS becomes important.”

As Labuschagne explains it, “the UPS operates from charged batteries and, depending on the autonomy available, can offer a full load supply instantaneously as the mains fail. This gives the generator time to start up and ramp to the required load, at which point it will support the UPS by recharging in order to sustain power. The full UPS load on the generator should be around half to a maximum of two thirds of the full load capacity of the genset. The reason for this is that any switching of equipment on a generator running close to full load may cause dipping and ramping of voltages and frequency as the generator tries to compensate with little reserve. In order to avoid this fluctuation manufacturers recommend 50% to 70% operating loads on gensets.”

Petrol and diesel powered generators have long been the main contenders, but the use of gas generators is now becoming more common. Labuschagne summarises the main differences between the three options as follows: “Gas gensets are silent with clean combustion. They provide moderate power levels and are very expensive to buy, but the running costs are lower. Diesel units are more noisy and the combustion is not clean, however they are more powerful and cost effective to run. Petrol generators provide strong power output and versatility in application, but are less cost effective than diesel and a bit noisy.”

For more information contact:

• Neal Thomas, Eurobyte Technology, +27 (0)21 551 2804, neal@eurobyte.co.za, www.eurobyte.co.za.

• Marius Labuschagne, Legrand South Africa, +27 (0)11 444 7971, marius.labuschagne@legrand.co.za, www.legrand.co.za.


Credit(s)
  Share via Twitter   Share via LinkedIn      

Further reading:

  • Significant differences in ­perceptions on state of digital trust
    November 2018, CA Southern Africa, Access Control & Identity Management, Security Services & Risk Management
    Nearly half of businesses admit to selling customer data, despite claiming data ­protection as paramount; consumer behaviour shows strong correlation between loss of business and lack of digital trust.
  • Trust but continually verify
    November 2018, Technews Publishing, This Week's Editor's Pick, Access Control & Identity Management, Integrated Solutions, IT infrastructure
    Hi-Tech Security Solutions looks at access and identity management and asks some industry players what ‘zero trust’ and ‘least privilege’ access means.
  • Managing who, what and why
    November 2018, Technews Publishing, This Week's Editor's Pick, Cyber Security
    Today’s access control isn’t only concerned with who has access, but also what has access, why they need it and what they are doing with it.
  • Physical/logical convergence
    November 2018, Technews Publishing, This Week's Editor's Pick, Cyber Security, Integrated Solutions, IT infrastructure
    The convergence between physical and logical (or cyber) security will be a game-changer because it will change the way we do everything, from planning to design and all the way to installation and maintenance.
  • Physical and logical convergence is a fact
    November 2018, This Week's Editor's Pick, Integrated Solutions, IT infrastructure
    Convergence, the next buzzword? A dated buzzword? Is convergence ­merely ­integration on steroids? What is convergence?
  • The expanding role of IT in access control
    November 2018, Technews Publishing, This Week's Editor's Pick, Access Control & Identity Management, IT infrastructure
    What role is IT playing in the world of physical access control and how far will its role expand in future?
  • Taking augmented identity to the world
    November 2018, Technews Publishing, This Week's Editor's Pick, Access Control & Identity Management, Integrated Solutions
    Hi-Tech Security Solutions spoke to Gary Jones, VP Global Channel and Marketing biometric access and time solutions) at IDEMIA (formerly Morpho) about his career with the company and its new vision of Augmented Identity.
  • Tracking biometrics into a brave new digital world
    November 2018, This Week's Editor's Pick, Access Control & Identity Management, Integrated Solutions
    The industry is increasingly transitioning from unimodal to more integrated multimodal biometric solutions for more accurate identity verification and faster real-time results.
  • A better approach to fingerprint biometrics
    November 2018, This Week's Editor's Pick, Access Control & Identity Management
    Not all optical biometric fingerprint scanners are created equal. The type of sensor used has a powerful impact on speed, accuracy, reliability and portability.
  • The right access decisions
    November 2018, Technews Publishing, This Week's Editor's Pick, Access Control & Identity Management
    Making the right access control decision depends on what you want secured and how secure it should be.
  • Reliability a fundamental in visitor management
    November 2018, Powell Tronics, Access Control & Identity Management, Integrated Solutions, Security Services & Risk Management
    With the rapid evolution of biometric technology, there are many options available in the marketplace that promise varying levels of performance.
  • Digital channels and the evolution of ID
    November 2018, This Week's Editor's Pick, Access Control & Identity Management, IT infrastructure
    While the concept of identity (ID) remains unchanged, the rapid evolution of digital technology has dramatically extended both its application and form factor.

 
 
         
Contact:
Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronic Buyers Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory (HSBD)

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Other
Terms & conditions of use, including privacy policy
PAIA Manual
         
    Mobile | Classic

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.