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Lightning surge arresters are created to decrease voltage transients like those resulting from lightning strikes or switching operations. These components protect sensitive electronics and electrical systems from damage or malfunction as necessary.
This varistor type is commonly found in low and medium voltage distribution systems. They protect critical equipment and/or system parts from transient overvoltages by absorbing their energy and restricting voltage increase to harmless levels.
As a result, these devices are positioned at the distribution transformer secondary, load side of switches and fuse, motor feeder terminals, and MV consumer connections. Protection of electrical equipment like motors, generators, transformers, and electronic systems. Maintain service reliability and provide continuous operation.
These are medium voltage arresters designed to be installed in the substation or at the points of common coupling. They prevent electrical inter-equipment communication transients from affecting electrical devices during lightning storms. Protects, for instance, a generator connected to a transformer by preventing transients from the power line from affecting the generator.
According to Varistor, the surge arresters types include:
Surge protection device/TVSS manufacturers produce devices to protect against transient overvoltages caused by lightning strikes. Large electrical installations such as power plants, industrial facilities, commercial buildings, and data centers require additional protection due to having many critical electrical equipment connected to the same network.
By reducing the voltage surges caused by lightning strikes or switching operations, the devices enhance the safety of electrical systems in industrial applications. Protects vital space systems' onboard electrical/telemetry and test equipment. Avoids installation or maintenance costs due to equipment repair caused by electrical surges.
Reduces damage, downtime, and maintenance costs due to power surges.
Avoids the risk of fires caused by surges in power lines. Ensures smooth data transmission with no interruption in communication.
Surgers safeguard devices like computers, communication systems, and industrial control equipment from voltage spikes that can cause damage or malfunction. Arresters absorb or redirect surge energy to protect sensitive electronic circuits.
Reduces the risk of electric shocks to maintenance or operating personnel when working near high-voltage equipment connected to power lines with surges.
Surge arresters must operate within the electrical system's voltage range to ensure proper functionality.
Understand the system and operational requirements to select the best suppressor. Use arresters specifically intended for AC or DC systems. Consider power frequency and DC voltage levels in detail, particularly for high-voltage systems like HVDC power transmissions.
Assess environmental conditions that arresters will experience. High temperatures and humidity can degrade arresters over time. Operational and maintenance strategies for protecting arresters vary based on temperature and local climate. Choose arresters that can withstand exposure to corrosive gases, salt spray, and other environmental factors.
Assess the protection level required for the electrical system. Surge arresters with various protective levels are available. High protection level arresters may have a lower failure rate but could be larger in size. Low voltage equipment systems may tolerate lower protection levels with smaller arresters.
Consider installation and maintenance aspects when selecting arresters. Some arresters are easy to install and maintain, while others require specialized tools. Think about their accessibility for maintenance, particularly in hard-to-reach places.
Select lightning surge arresters based on their expected reliability and life span. Some arresters are more robust and can operate reliably for long periods under harsh conditions. The mean time between failures of the selected arresters should be sufficient for the intended application.
Compare the cost of different surge arresters. Budget constraints might influence the choice of an arrester. However, long-term maintenance costs and the potential damage caused by not having adequate protection should also be considered. Considers both initial and ongoing costs when selecting surge arresters.
Are built using different surge protective devices integrated into a single housing to provide coordinated multi-stage surge protection for various voltage levels and applications? Users can be provided with two or three SPD configurations for AC or DC voltage ratings and applications.
Surge suppressors can be installed in standard IP-rated enclosures for mounting and protection or in other user-defined racks, cabinets, or package housings. The installation location should influence enclosure or rack style and protection level.
To protect surge arresters from damage, real-time monitoring should be incorporated. Vital parameters include input voltage, surge event counts, SPD health status, and others that affect output power status.
Communication interfaces like relay, Modbus or SNMP, provide local/remote alarms for users, enabling prompt maintenance and avoiding long outages.
For interconnecting with the power system and being installed, surge suppressors have various electrical terminal configurations. These range from standard threaded studs to push-on terminals and terminal blocks.
Customization options pertain to input and output wiring styles, including long lead wires with color coding and fitting connectors, accommodating specific mounting requirements like flanged brackets extending the height and depth of enclosures for various environments.
Application-dependent surge suppressors can be customized to host specific SPD by purpose and voltage level.
Common selections include:
When power surges occur, an arrester redirects excess voltage away from sensitive equipment and into the ground. It does this by creating a low-resistance path for the surge energy to dissipate safely.
Surge protectors refer to smaller residential surge suppression devices like power strips or wall-mounted units. Conversely, arresters are large industrial and commercial protection devices installed on electrical systems and infrastructure, including power lines, substations, and transformers.
Surge arresters can last anywhere from 3-10 years. Environmental factors like temperature, humidity, and exposure to corrosive elements may affect their longevity. Additionally, surge intensity and frequency also play a role in degrading an arrester over time.
Indicators of a failing lightning arrester include:
Maintenance and monitoring should be done regularly to ensure the alert status is performing that protects against surges. In the course of maintenance, clean it up and look for signs of wear, component deterioration, or damage. Replace any damaged parts. Ensure good grounding and wiring to avoid losing efficiency. Avoid continuous operation at high loads. Do not expose it to extreme environmental conditions. Ensure the power level doesn't exceed what the protector can handle.
