#Surge Protection Devices

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Application of Surge Protection Devices (SPD)

As we described in our previous blog, ‘Lightning Protection System Design and Products’, Surge Protection Devices or SPD’s are an important part of any building’s Internal Lightning Protection System (LPS). SPD’s are designed to protect sensitive electronic & electrical equipment by limiting transient overvoltage and diverting surge currents. SPD’s are the most efficient and commonly used type of overvoltage protection for a facility or load below low voltage range.

Malfunctions or damage to electrical devices can occur when a surge voltage exceeds that device’s dielectric strength. These kinds of surge voltages with very high amplitudes in the kilovolt range, are usually transient, meaning that they range from a few microseconds to several hundred microseconds. These short durations with high amplitudes cause sudden voltage increases and whose effects can only be protected against by surge protection devices. Surges such as these most likely caused by lightning strikes (direct or indirect), switching operations and electrostatic discharges.

Relevant Standards: UL 1449: Standard for Surge protection devices (SPD), IEC 62305: Lightning protection standard, IEC 61643: Low-voltage surge protective devices

How do SPD’s Protect against Overvoltage:

SPD’s are designed to limit the surge voltage in terms of amplitude so that the dielectric strength of the device is not exceeded and additionally to discharge the surge currents associated with surge voltages to a distant ground. They perform these activities while connected either in parallel to the equipment, between the active conductors or between the active conductor and the protective conductor. Whenever there is excess charge or surge in the system, the SPD behaves like a switch and turns off (i.e. has low resistance) so that the surge current bypasses the sensitive equipment and flows to the earthing system. Once the surge is over, the SPD opens up and the equipment and system will work smoothly again.

Lightning Protection Zones:

The placement of SPD’s within an electrical system is determined using the Lightning Protection Zones determined for the structure as defined in IEC 62305 Part 4. The external zones (LPZ 0a and LPZ 0b) can only house surge resistant equipment while the internal zones can house sensitive equipment such as medical equipment.

LPZ 0A: Unprotected zone outside of a building where direct lightning strikes are possible.

LPZ 0B: Zone outside the building that is protected from direct lightning strikes, for example, by an air terminal.

LPZ 1: Zone inside the building where high-energy surge voltages or surge currents and strong electromagnetic fields are still to be expected.

LPZ 2,…., n: Zone inside a building where surge voltages or surge currents and electromagnetic fields that have already been significantly weakened are to be expected.

Types of SPD’s and their Application

As per IEC 62305, standard SPD’s are divided into the following categories:

1) Type 1:

The Type 1 SPD is recommended in the specific case of service-sector and industrial buildings, protected by a lightning protection system or a meshed cage. It protects electrical installations against direct lightning strokes. It can discharge the back-current from lightning spreading from the earth conductor to the network conductors. This means that they are installed where there is a change from Zone 0 to Zone 1 such as the entrance of an electrical line into a building.

2) Type 2:

Type 2 SPD’s are the main protection system for all low voltage electrical installations. Installed in each electrical switchboard, it prevents the spread of overvoltage’s in the electrical installations and protects the loads. This means that they are installed in Zone 1 or higher.

3) Type 3:

These SPDs have a low discharge capacity. They must therefore mandatorily be installed as a supplement to Type 2 SPD and in the vicinity of sensitive loads. This means that they are installed in Zone 2 or higher.

Characteristics of SPD:

IEC 61643 Part 11, defines the characteristics and tests for SPD’s connected to lower voltage distribution systems.

Uc: Maximum continuous operating voltage

The SPD becomes active above this A.C. or D.C. voltage. The rated voltage and the system earthing arrangement helps determine this value.

Up: Voltage protection level (at in)

When the SPD is active, this is the maximum voltage across its terminals. When the current flowing in the SPD is equal to in the voltage reached is up. The voltage protection level chosen must be below the overvoltage withstand capability of the loads. In the event of lightning strikes, the voltage across the terminals of the SPD generally remains less than up.

In: Nominal discharge current

This is the peak value of a current of 8/20 μs waveform that the SPD is capable of discharging 15 times.

Contact us for any questions or requirements for SPD’s.

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6 Reasons To Opt For A Comprehensive Lightning Protection Design System

Since 1971, LEC has developed specialized expertise in lightning protection design. While traditional lightning strike protection methods may be adequate for some installations, custom lightning protection design systems meet more exacting requirements when more complete protection is needed. Engineering an appropriate solution is more complex than simply putting up a lightning rod. Before implementing a protection plan, each site is evaluated for risk factors, geography, soil type, and many other parameters.

A comprehensive lightning protection design is a necessity for all facilities, and here are six reasons:

Climate change has increased the number of lightning strikes each year, putting every part of the country at risk. 

The devices that operate your facility and keep you, your investment, and your personnel safe — including security systems, heating and cooling equipment, and electronic appliances — can be knocked out by lightning surges, even if the lightning does not directly strike your facility.

Grounding and surge protection products without lightning protection do not protect against lightning.

At LEC, lightning protection systems are custom designed and installed by our professional and experienced engineers, keeping the building's aesthetics in mind.

Lightning protection is affordable, may reduce insurance premiums, and can enhance the value of your facility by providing peace of mind.

A properly installed lightning protection system safeguards a business structurally and also protects property, inventory, electronic equipment, and personnel from the destructive forces of lightning. Like fire alarms, sprinklers, and security systems, a lightning protection system provides the peace of mind that comes from knowing that a potentially catastrophic problem has been dealt with proactively.

Did you know that a lightning protection system that has been designed and installed according to accepted industry standards can last for two to three generations with little to no maintenance? Furthermore, when a structure is remodeled to meet new requirements, most of the components of a lightning protection design system will remain usable when reconfigured. Or if a structure is torn down, the aluminum and copper components can be easily recycled without deterioration.

We are dedicated to providing lightning protection and prevention products, solutions, and services that meet international standards. 

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SUNXO SOLAR ACDB Single Phase 32 A MCB, 320 V SPD 1-5 KW Solar AC Distribution Box.

This ACDB is equipped with a Type 2 Surge Protective Device (SPD) and a 32A Miniature Circuit Breaker (MCB) to provide protection for your electrical circuits. This ACDB is an ideal choice for both residential homes and small commercial spaces. With the Type 2 SPD, this ACDB effectively defends against voltage surges and transients, safeguarding your valuable electronics and ensuring their longevity. The 32A MCB in this ACDB serves as a reliable overload protection, disconnecting the circuit in the event of electrical faults and offering peace of mind. This ACDB is designed to withstand dust and moisture, ensuring long-term reliability and protection for your electrical circuits.

MCB Havells 2P 32 A- This AC distribution box provides complete protection and fault prevention for your Solar system or Home. It includes a fast-tripping top brand AC MCB that will quickly de-energize the entire AC circuit in case of overload, short circuit, or excess current.

SPD SIBASS- The top brand AC SPD safeguards your inverter, appliances, and circuits by diverting dangerous voltage surges to ground.

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Your Advantage Of Using DAS To Minimise Lightning Damage

Direct lightning strikes and their secondary effects are some of the most harmful natural occurrences because they can occur anywhere and hit any object. Lightning protection systems can mitigate the issue. It’s the only real “insurance” owners have that their investment will be protected. For years the focus of Lightning Eliminators & Consultants, Inc. has been on researching the science of strike collection. DAS prevents the formation of streamers on ground-based objects, protecting industrial facilities from the devastating effects of lightning as comprehensibly as possible. Contact us and stay protected: https://www.lightningprotection.com/

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Understanding Surge Protection Devices and Factors Influencing Their Price

Surge protection devices (SPDs) are crucial components in electrical systems designed to safeguard sensitive equipment and appliances from voltage spikes and transient surges. These devices help prevent damage caused by lightning strikes, power outages, and other electrical disturbances by diverting excess energy to the ground. In this article, we explore the importance of surge protection devices, factors influencing their price range, and considerations for selecting the right SPD for your specific needs.

Importance of Surge Protection Devices:

Surge protection devices serve as a frontline defense against voltage spikes and surges that can damage electronic devices, appliances, and electrical systems. Key benefits of SPDs include:

Equipment Protection: SPDs shield electronic devices and equipment from damage caused by sudden voltage surges, prolonging their lifespan and ensuring reliable performance.

Safety: By diverting excess energy safely to the ground, surge protection devices help prevent electrical fires and safeguard against potential hazards to both individuals and property.

Data Protection: SPDs are essential for protecting sensitive data and electronic systems from the harmful effects of power surges, ensuring uninterrupted operation and data integrity.

Factors Influencing Surge Protection Devices Price:

Level of Protection: The level of protection offered by an SPD, typically measured in joules, influences its price. Higher joule ratings indicate a greater capacity to absorb energy from surges, resulting in higher costs.

Voltage Rating: The voltage rating of an SPD determines the maximum voltage it can handle. Devices designed for higher voltage applications may be more expensive due to their specialized construction and components.

Type of SPD: Different types of surge protection devices, such as whole-house surge protectors, power strip surge protectors, and individual device protectors, vary in price based on their features and capabilities.

Brand and Quality: Established brands known for their reliability and quality may command higher prices compared to lesser-known or generic brands. Quality components and construction contribute to the overall cost of the device.

Installation Complexity: The complexity of installing an SPD, especially for whole-house surge protectors requiring professional installation, can impact the overall price of the device.

Warranty and Certifications: Surge protection devices with longer warranties and certifications from recognized testing organizations may come at a higher price due to the added assurance of performance and reliability.

Considerations for Selecting Surge Protection Devices:

Voltage Compatibility: Ensure that the SPD is compatible with the voltage requirements of your electrical system to provide effective protection.

Joule Rating: Consider the joule rating of the SPD to determine its capacity to handle power surges and protect connected equipment.

Installation Location: Determine the optimal location for installing the SPD to offer comprehensive protection to your electrical devices and systems.

Budget and Requirements: Evaluate your specific protection needs, budget constraints, and the criticality of the equipment to select an SPD that best fits your requirements.

In conclusion,surge protection devices price  are essential components in safeguarding electrical systems and equipment from the damaging effects of power surges. Understanding the factors influencing the price range of SPDs, such as level of protection, voltage rating, type, brand, installation complexity, and warranty, is crucial for making informed decisions when selecting the right surge protection device for your needs. By considering these factors and assessing your specific requirements, you can ensure the effective protection of your valuable equipment and maintain the integrity of your electrical systems.

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