State-of-the-art AVRs protect Electronics

Clearline Protection Systems, specialists in surge protection, has a range of Automatic Voltage Regulators (AVR) specifically developed for the South African market. The new product will protect consumers against equipment damage and malfunction due to noise, transients, load shedding and induced lightning.

Poor Quality Power is a reality in SA

Advances in digital technology have resulted in additional speed and miniaturisation in almost all electronic equipment. The microprocessor is now commonplace in most electronic equipment but is highly susceptible for power disturbances.

Power quality determines the fitness of electrical power to electrical and electronic equipment.

Without the proper power voltage input, an electrical or electronic device might malfunction, fail prematurely or not function at all. There are many ways in which electric power can be of poor quality. The consumer has no control over what gets connected to the electrical grid, and often noise, transients, load shedding and induced lightning all pose real threats to the correct functioning of electronic equipment.

Clearline’s AVR ensures stable, noise-free voltage Output

The Clearline range of automatic voltage regulators address the mentioned power conditions to give stable, noise free voltage output. Each device is equipped with a high end surge protector on the line input, followed by microprocessor controlled voltage regulator (AVR) and finally, a high performance filter. The surge protector is a class 3 device fitted with thermal protection. The AVR is able to accept voltages as low as 160V and as high as 260V while still delivering a safe output voltage.

In the event of the voltages arriving outside these limits, a trip function has been included to disconnect the equipment and reconnect automatically when the input supply returns to normal parameters. Voltage indication is provided throughout the range and the line filter has a high attenuation to unwanted signals between 10kHz and 10Mhz.

Full after sales support is given and comes standard with connectivity warranty on equipment, connected to the devices. For more detail contact Clearline Protection System (Pty) Ltd on (011) 848 1100.

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Power Protection Zoning

Correct protection principles may be applied by introducing the international standards IEC 61024-1 (protection of building structures against lightning) and IEC 61312-1 (protection of information systems LEMP).

These standards define the correct procedures to be followed to install an effective lightning protection system. It is important that the protection system includes both structural and surge protection equipment.

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Protecting against surges

Lightning protectors do not always prevent damage to equipment. Investigation shows that these failures are often due to incorrect installation – large voltages occur across the various inputs and outputs of equipment, causing damage.

Clearline has solved this problem by introducing their patented “Surge Potential Platform” on all their combination protection devices. This ensures that surge currents are interchanged on the surge platform and not through the equipment.

These protective devices are of the “plug and play” variety and require no additional earthing.

 

In the diagram above, the data cable carrying the surge energy is passed through the protection platform. The surge energy is then diverted to the power earth before it can harm the equipment. A power and data surge arrester has been included in the platform.

Electronic disconnect in the event of protector failure

Unlike many devices available today, Clearline’s products have internal temperature fuses that will disconnect the power to the protector in the event of overload or fault. This will ensure that ignition of the plastic housing will not take place. Indication either as a mechanical flag or electronic indicator will advise the user of the protection status. On the professional models, additional filtering has been included with visual and audible fault indication.

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How Lightning affects Electronics

During the last decade enormous advances in electronic technology have been made, bringing sophisticated electronic equipment into our homes in the form of video, sound, security, computers and appliances. However, due to miniaturisation, these products are also susceptible to interference emanating from lightning and load switching and to prevent damage from occurring, correct protection is required.

Recent adoption by the South Africa Bureau of Standards SANS 61024-1 {protection of building structures against lightning electro magnetic pulse (Lemp)} and SANS 61312-1 {protection of information systems against Lemp} now makes it possible to design protection systems that will greatly increase the reliability of installed electronic equipment. Clearline’s objective is to provide effective protection solutions at affordable costs.


Are you curious about the protection solutions we offer? Check out our product catalogue or ask the advice of an expert on  sales1@clearline.co.za 


How does Lightning Affect Electronic Systems?

Galvanically coupled surge voltages:

Lightning can strike the air conductors directly and surge voltages, even from kilometres away, can enter into your installation. This surge voltage is then passed to ground through your equipment which can lead to damage or complete destruction of your equipment.

Galvanically coupled surge voltage

Induced surge voltages:

When lightning strikes an object, (a building, tree or pole etc.) high currents at fast wave fronts occur causing large electromagnetic fields which are then induced into your electrical and data communication cabling. Equalisation then occurs which could cause damage to your equipment.

Induced Surge Voltage

Earth potential differences

When lightning strikes a structure, (a building, tree or pole etc.) a high voltage potential exists for the duration of the strike at the point of contact of the structure to the ground. Due to resistivity of the earth, decreasing voltage potentials will be experienced along the current paths moving away from this point. Should you have electronic equipment referenced to different earth systems while connected to each other via copper cables, equalisation will tend to occur via the copper cables resulting in equipment damage.

Earthing potential differences


So what can I do to protect my equipment?

For a start, begin with some of our plug and play items:

You can also look at other protection methods such as external protection systems.

External Protection

External or structural protection should always be considered as an integral part of a correctly designed protection system. As the name implies, external or structural protection will only protect the structure and not the equipment located inside the structure. When lightning current is passed into the ground, high electromagnetic fields are generated which will be induced into cabling and wiring causing equipment damage. A correctly co-ordinated protection system to SABS IEC 61024-1 and SABS 0313 should be followed.

Single pole protection system

A common form of structural protection is the single pole lightning conductor. The lightning pole is located considerably higher than any other point or area of structure to be protected and provides a cone of protection around the structure. The object of the pole is to intercept the lightning discharge and to provide an orderly path to the ground.

Single Pole Surge Protection

Mesh air termination system

The system consists of several capturing points connected to each other through conductors. A network is formed which is extended with conductors leading to the earth electrode system. This method is suitable for larger buildings as it is usually easy to install.

Mesh air termination system

 


 

Curious how Clearline’s products could help your protect you equipment from lightning and power surge damage? Call us today for  free advice on at 011 848 1100 or email:  sales1@clearline.co.za

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Protecting Home Security equipment

On the Highveld where thunder storms are experienced daily during summer,  lightning and surge protection are critical when it comes to security, access control and surveillance systems.

The most important aspect is to approach protection from a holistic point of view. It is simply no good to just fit a protection device at the access control equipment or anywhere along the line on the main supply.

About Lightning

Lightning is one of the common weather event to affect South Africa. According to international research there are roughly 2000 thunderstorms in progress around the world at any one time, producing 30 to 100 cloud-to-ground flashes every second, equating to five million flashes per day. South Africa is a lightning prone country with one of the highest lightning ground flash densities in the world.

Lightning related death statistics are nearly 4 times higher in South Africa than the global average. In a recent study published in ‘Annales Geophysicae’, it is shown that the Witwatersrand and the Drakensberg areas experience the highest level and intensity of lightning. This is further substantiated by the SA Weather Services who recent introduced a lightning surveillance system. In their overview for 2006 (See map) it clearly shows that although Gauteng, the Drakensberg area and Northern Natal are worse off, the rest of the country is not spared. It just takes one strike near you!

Main Sources of Surges

We have to deal with two main sources of surges. The first and probably the most common sources are mains borne surges. Switching of large industrial loads connected to the power supply grid causes these surges. As the loads are switched on, the voltage is ‘pulled down’ for a fraction of a second. The supply authorities automatically compensate for the additional load, which results in a short duration over voltage before the supply stabilises once more. The result is a surge. Whilst these surges are for all intents and purposes relatively low level they can be of significant duration, and the energy component is therefore enough to cause damage to sensitive electronics.

When electronic equipment is regularly subjected to these low level-switching surges the equipment will exhibit signs of premature aging as the components are regularly forced to work outside of specified parameters.

The methodology employed in protecting against these surges is to install surge protection on the main incoming power. Since the surges enter the installation through the power lines it is only necessary to install protection at this point to prevent damage from this source. This will however not protect against the major source of surges – lightning.

To fully understand how to protect against these potentially catastrophic transients it is essential to review how lightning surges enter into the system. There are 4 ways in which the massive amounts of energy in a lightning strike enter into an electronic system.

  • Direct Coupling – Lightning strikes the power line.
  • Inductive Coupling – EMF induces secondary currents into cabling.
  • Capacitive Coupling – Capacitive effects of steel roofs and cabling.
  • Galvanic Coupling – Potential difference effect.

Galvanic coupling

The term Galvanic coupling has an interesting history: In 1783, according to popular version of the story, Galvani dissected a frog at a table where he had been conducting experiments with static electricity, Galvani’s assistant touched an exposed sciatic nerve of the frog with a metal scalpel, which had picked up a charge. At that moment, they saw sparks in an electricity machine and the dead frog’s leg kick as if in life. The observation made Galvani the first investigator to appreciate the relationship between electricity and animation or life. He is typically credited with the discovery of bioelectricity.

Galvani coined the term animal electricity to describe whatever it was that activated the muscles of his specimens. Along with contemporaries, he regarded their activation as being generated by an electrical fluid that is carried to the muscles by the nerves. The phenomenon was dubbed ‘galvanism’, after Galvani, on the suggestion of his peer and sometime intellectual adversary Alessandro Volta.

Consider what happens when lightning strikes the ground or an object that is connected to ground. If one could measure the potential in the ground at the instant that lightning strikes, the potential where the lightning enters the ground is in the order of several hundreds of thousands of volts. Further from the point of entry the potential will drop off until at some distance from the point of impact the potential drops to 0V.

Consider the two points. They are like the terminals of a 500 kV battery (if there was such a battery). Connecting a conductor across the imaginary terminals that have a very much lower resistance than the ground path, the larger current will flow through the conductor. Using ohms law with too resistors in parallel, the resistor with the lowest ohm value will carry the larger proportion of the current.

It is this principal that causes so many deaths amongst people and livestock around the world every year. A golfer on the course near a lightning strike provides a lower resistance path between his two legs that are a little distance apart and it thus subjected to a high current flow through his body.

The further away we move from the point of strike, the voltage is less. If we however earth equipment at the near the point of strike and again other equipment some distance away and the two earthed sites are connected through data lines, there will be a difference in potential that will be equalized through the lowest point of resistance, which will be through the equipment thus causing severe damage.

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Site Surveys – surge and lightning protection

Clearline has specialised for 30 years in the design and manufacture of high and low voltage surge and lightning protection, and have both the experience and technical know-how to to identify areas of risk and assess protection needs.

Our well-equipped teams will conduct site surveys, and then consult with property owners and developers to find the most cost effective solution to reduce risks associated with Lightning and power surges

Please request a quote based on your location. The call out fee is waived if the site visits results in a sale.

About Clearline    Legal Stuff:  Terms & Conditions  ::   Privacy Policy       Contact Us     Site Map

‌‌‌ 2018 Clearline All Rights Reserved


 Tel (011) 848-1100 :: sales@clearline.co.za

State-of-the-art AVRs protect Electronics

Clearline Protection Systems, specialists in surge protection, has a range of Automatic Voltage Regulators (AVR) specifically developed for the South African market. The new product will protect consumers against equipment damage and malfunction due to noise, transients, load shedding and induced lightning.

Poor Quality Power is a reality in SA

Advances in digital technology have resulted in additional speed and miniaturisation in almost all electronic equipment. The microprocessor is now commonplace in most electronic equipment but is highly susceptible for power disturbances.

Power quality determines the fitness of electrical power to electrical and electronic equipment.

Without the proper power voltage input, an electrical or electronic device might malfunction, fail prematurely or not function at all. There are many ways in which electric power can be of poor quality. The consumer has no control over what gets connected to the electrical grid, and often noise, transients, load shedding and induced lightning all pose real threats to the correct functioning of electronic equipment.

Clearline’s AVR ensures stable, noise-free voltage Output

The Clearline range of automatic voltage regulators address the mentioned power conditions to give stable, noise free voltage output. Each device is equipped with a high end surge protector on the line input, followed by microprocessor controlled voltage regulator (AVR) and finally, a high performance filter. The surge protector is a class 3 device fitted with thermal protection. The AVR is able to accept voltages as low as 160V and as high as 260V while still delivering a safe output voltage.

In the event of the voltages arriving outside these limits, a trip function has been included to disconnect the equipment and reconnect automatically when the input supply returns to normal parameters. Voltage indication is provided throughout the range and the line filter has a high attenuation to unwanted signals between 10kHz and 10Mhz.

Full after sales support is given and comes standard with connectivity warranty on equipment, connected to the devices. For more detail contact Clearline Protection System (Pty) Ltd on (011) 848 1100.

About Clearline    Legal Stuff:  Terms & Conditions  ::   Privacy Policy       Contact Us     Site Map

‌‌‌ 2018 Clearline All Rights Reserved


 Tel (011) 848-1100 :: sales@clearline.co.za

Programmable surge protection units

The single and three phase Tripconnect lightning and surge protection unit with programmable delay protects any electrical installation from damage due to lightning or large fluctuations in supply voltages. When the supply voltage is too low or too high, the unit disconnects power to the downstream equipment. It then automatically restores power after a preset delay when the supply returns to acceptable levels.

Various modules are available for loads up to 115 A. These units are supplied with internal contactors up to 65 A. These units perform cycle by cycle rms voltage measurements, providing protection against over and under voltage conditions.

The units incorporate similar technology and designs as that of an automatic voltage regulator, and are installed between the incoming supply and the DB board or equipment.

Typically these protection systems are suitable for domestic, commercial and industrial applications. This system is particularly useful when protecting large equipment such as motors, pumps, refrigeration and air-conditioning systems.

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Instant surge protection for your computer

Clearline’s 12-00220 multi-plug protects your computer, printer, scanner and modem against lightning and surges without additional earthing. The protection modules have multiple stages of protection capable of blocking severe lightning and power surges.

Clearline incorporates a fast overload device which will be activated in extreme conditions. Functional indication lamps display the protection status of the unit. Clearlines unique built-in thermal protection devices eliminates fire hazards.

THE DUOLINE SERIES Computer Protection Systems features

  • Plug-and-Play concept
  • High surge capability
  • Fire hazard protection
  • Line filtration
  • 1m power cable
  • Power Module
  • Max. continuous voltage: 250V 50Hz
  • Max. continuous current (Thermal overload protected): 16A
  • Modem Module Data speed: 100 kbits/s

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‌‌‌ 2018 Clearline All Rights Reserved


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Protect against loadshedding voltage fluctuations

When Power utility companies reconnect power after Substation Faults or Load Shedding, there are often over and under voltage power conditions that can damage your valuable electronic equipment.

The power TRIPCONNECT prevents damage form power surges and dips (brownouts) caused by power shutdowns, and over and under-voltages from unstable power.

The duration of these conditions is normally longer and can be especially damaging to air-conditioners and electronic motors running under load, and expensive electronic equipment.

Call us now for a complete protection solution on Tel: 011 848 1100

12-00498
3 Phase Fixed Timing
12-00407
Single Phase Fixed Timing
12-00409
3 Phase Programmable Timing

About Clearline    Legal Stuff:  Terms & Conditions  ::   Privacy Policy       Contact Us     Site Map

‌‌‌ 2018 Clearline All Rights Reserved


 Tel (011) 848-1100 :: sales@clearline.co.za

About Clearline    Legal Stuff:  Terms & Conditions  ::   Privacy Policy       Contact Us     Site Map

‌‌‌ 2018 Clearline All Rights Reserved


 Tel (011) 848-1100 :: sales@clearline.co.za