Surge protection device basic knowledge

Surge protection device basic knowledge

Think of surge protection as a bouncer at a nightclub. He may only let certain people in and quickly tosses the troublemakers. Getting more interesting? Well, a good whole-house surge protection device does essentially the same thing. It allows in only the electricity your home needs and not the unruly over-voltages from the utility—then it protects your devices from any trouble that can occur from surges inside the house. Whole-house surge protective devices (SPDs) are typically wired to the electric service box and located nearby to protect all the appliances and electrical systems in a home.

surge protection device - FAQs

Surge Protection – Frequently Asked Questions

What is a Surge Protector and what does it do?
The surge protectors that we supply are installed in the main panel box, the heart of your home’s electrical system. They are designed to stop lightning or power surges at the panel, before they enter the rest of your home, unlike the point of use surge protectors that stop a surge after it is already in your house (and next to your walls, furniture, carpet drapes and other flammables)! The panel surge protector diverts all of the energy away from your home and out into your home’s grounding system. You will want to make sure you have a good grounding system (our electrician can inspect the grounding system while he is there installing the surge protector). Additionally, surge protectors “clean up” the minor fluctuations in energy that occur throughout the day. While these small spikes in power may go unnoticed by you, over time they can wear down and reduce the lifetime of more sensitive electronics

lighting rod

Can lightning rods really avoid lightning

LSP reminds that since Franklin invented the lightning rod in the 17th century and reached the end of the 18th century, the lightning rod was widely used and play an important role, which is universally acknowledged. Later practice has further proved that lightning rods and their derived lightning protection strips, lightning protection nets, and lightning protection lines are quite effective for defensive direct lightning strikes.

However, many people believe that the lightning rod is a lightning protection device that will not only eliminate the lightning damage but also included more secondary lightning strikes. So what exactly working in real time?

As we all know, lightning is a phenomenon that occurs randomly. It can discharge in the air and also discharge to the ground. Of course, it may also hit lightning rods or other objects. When it comes to lightning, a building or a structure itself can be used for lightning. It is not that lightning is installed before lightning is introduced.

Surge protection devices for industrial application 1

Surge protection devices for industrial applications

Industrial applications include various types of equipment that need to be protected from the effects of surges. They are costly to the company owner: the price may be enormous and the failure, or even replacement, of those devices, would incur a major financial loss, possibly putting the very existence of the company at stake. The key aspects, from the perspective of trade unions, are the employees: they operate electrical equipment and, in the event of a surge, their lives might be at risk. The facts mentioned above, as well as other causes, represent substantial reasons why one should seek protection from surges. This function uses internal and external protection from lightning, such as the air terminals, grounding, protective busbar, surge suppressors, all jointly referred to as surge protection devices, SPD. There are a number of companies that produce a plethora of devices, yet not all of them are suitable for industrial applications.

BS EN IEC 62305 Lightning protection standard_o

BS EN IEC 62305 Lightning protection standard

The BS EN/IEC 62305 Standard for lightning protection was originally published in September 2006, to supersede the previous standard, BS 6651:1999. For a finite period, BS EN/IEC 62305 and BS 6651 ran in parallel, but as of BS EN IEC 62305 Lightning protection standardAugust 2008, BS 6651 has been withdrawn and now BS EN/IEC 63205 is the recognized standard for lightning protection.

The BS EN/IEC 62305 standard reflects an increased scientific understanding of lightning and its effects over the last twenty years and takes stock of the growing impact of technology and electronic systems on our daily activities. More complex and exacting than its predecessor, BS EN/IEC 62305 includes four distinct parts – general principles, risk management, physical damage to structures and life hazard, and electronic systems protection.

Lightning and surge protection for rooftop photovoltaic systems

Lightning and surge protection for rooftop photovoltaic systems

At present, many PV systems are installed. Based on the fact that self-generated electricity is generally cheaper and provides a high degree of electrical independence from the grid, PV systems will become an integral part of electrical installations in the future. However, these systems are exposed to all weather conditions and must withstand them over decades.

The cables of PV systems frequently enter the building and extend over long distances until they reach the grid connection point.

Lightning discharges cause field-based and conducted electrical interference. This effect increases in relation to increasing cable lengths or conductor loops. Surges do not only damage the PV modules, inverters and their monitoring electronics but also devices in the building installation.

More importantly, production facilities of industrial buildings may also easily be damaged and production may come to a halt.

Surge Arresters In Action Against Lightning

LV Surge Arresters In Action Against Lightning

The site consists of offices (computer hardware, lighting, and heating unit), a security post (fire alarm, burglar alarm, access control, video surveillance) and three buildings for the manufacturing process on 10 hectares in the Avignon region of France (probability of lightning is 2 strikes per km2 per year). There are trees and metal structures (pylons) in the vicinity of the site. All of the buildings are fitted with lightning conductors. The MV and LV power supplies are underground. A storm struck the site, destroying the LV installation in the security post and causing 36.5 kE of operating losses.


surge protection devices (spds) and rcd

Best practice for using surge protective devices (SPDs) and RCD together

Surge protective devices (SPDs) and RCDs
Where the power distribution system incorporates RCDs transient activity could cause RCDs to operate and hence loss of supply. Surge protective devices (SPDs) should wherever possible be installed upstream of RCD to prevent unwanted tripping caused by transient overvoltages.
Where surge protective devices are installed in accordance with BS 7671 534.2.1 and are on the load side of a residual current device, an RCD having an immunity to surge currents of at least


Choice of Surge Protection Devices for Photovoltaic Applications

To achieve complete functionality of a photovoltaic (PV) power plant, whether small, installed on the roof of a family house or large, extending over vast areas, it is necessary to develop a complex project. The project includes correct selection of PV panels and other aspects such as mechanical structure, optimum wiring system (suitable location of components, correct oversizing of the cabling, protective interconnection or network protection) as well as external and internal protection against lightning and overvoltage. The LSP Company offers surge protection devices (SPD), which can protect your investment at a fraction of the total purchasing costs. Before projecting the surge protection devices, it is necessary to become familiar with the particular photovoltaic panels and their connection. This information provides basic data for selection of the SPD.

Figure 4 -Y -shaped protective circuitry with three varistors

Surge protection for photovoltaic systems

Photovoltaic (PV) facilities for exploiting renewable energy are at great risk from lightning discharges because of their exposed location and large surface area.

Damage to individual segments or the failure of the entire installation can be the consequence.

Lightning currents and surge voltages often cause damage to inverters and photovoltaic modules. These damages mean more expense for the operator of the photovoltaic facility. Not only are there higher repair costs but the productivity of the facility is also significantly reduced. Therefore, a photovoltaic facility should always be integrated into the existing lightning protection and grounding strategy.

Fig. J21 - The 4 case of SPD implementation

Surge Protection Devices are used for electric power supply networks

The Surge Protection Device (SPD) is a component of the electrical installation protection system.

This device is connected in parallel on the power supply circuit of the loads that it has to protect (see Fig. J17). It can also be used at all levels of the power supply network.

This is the most commonly used and most efficient type of overvoltage protection
SPD is designed to limit transient overvoltages of atmospheric origin and divert current waves to earth, so as to limit the amplitude of this overvoltage to a value that is not hazardous for the electrical installation and electric switchgear and controlgear.

Figure 1 - Lightning activity registered in Germany from 1999 to 2012

Summarize of lightning and surge protection devices

Failure of technical installations and systems in residential and functional buildings is very unpleasant and expensive. Therefore, faultless operation of devices must be ensured both during normal operation and thunderstorms. The number of annually registered lightning activities in Germany maintained at a constantly high level over many years. Damage statistics of insurance companies clearly show that there are deficits in terms of lightning and surge protection measures both in the private and commercial sector (Figure 1).

A professional solution allows to take adequate protection measures. The lightning protection zone concept, for example, enables designers, constructors and