What is DC surge arrester?
A surge arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events. To protect a unit of equipment from transients occurring on an attached conductor, a surge arrester is connected to the conductor just before it enters the equipment.
Which utility surge arresters are best?
Station class arresters offer the best discharge voltages of all arresters, provide high energy handling capabilities, have the highest fault current withstand capability and are available in ratings from 3 to 684 kV.
What is DC surge protection device?
SPDs are applied to electrical systems to provide a discharge path to earth to save those systems’ components from being exposed to the high-voltage transients caused by the direct or indirect effects of lightning or power system anomalies.
How do I choose a surge protective device?
Three rules of thumb for choosing surge protection Here are some rules of thumb for installing a surge protection device (SPD): Familiarize yourself with types, or categories, of SPDs. Assess the risk of lightning strikes and discharge capacities. Use the right devices to protect the surge protection itself.
Where is the surge arrester best installed?
As most surge protectors are installed in parallel to the power panels, normally the best place to install the device is on the main service or panel feeding the facility.
What are the types of surge arresters?
There are three classes of power system surge arresters: station-, intermediate-, and distribution-class. Station arresters provide the best protective levels but are more expensive. Insulation coordination is essential.
What is the difference between Type 1 and Type 2 surge protection?
Type 1 devices are installed before the main device in the loadcenter, whereas Type 2 are installed following the main devices in the loadcenters. Type 1 devices are dual-rated for Type 2 applications as well, providing the highest ratings available for installation at the service entrance.
Where should a Type 1 lightning protection arrester be installed?
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.
What are the different types of DC surge arresters?
A DC surge arrester is generally composed of a shell, a nonlinear resistance sheet, a spring, a pressure release device, a sealing device, etc., usually with a gapless (ZnO) lightning arrester. The main types of DC lightning arrester include: 1. A valve arrester: used to protect the converter valve from damage resulting from excessive voltage.
What’s the difference between surge arrester and lightning arrester?
We will discuss the main difference between the different types of arresters such as surge arrester, lightning arrester, surge suppressor and lighting rod as sometimes, they may used for same purpose. The difference shows that what kind of system you want to protect from what and how? Related Post: Is Lightning AC or DC ?
What is the maximum continuous operating voltage for surge arresters?
Arresters are continually exposed to the power system operating voltage during normal operation. For each arrester rating, there is a recommended limit to the magnitude of voltage that may be applied continuously. This is called the Maximum Continuous Operating Voltage (MCOV).
Why do surge arresters have gaps in them?
The lower the total voltage, the better the protection level. SiC arresters also contain current limiting gaps to limit the system follow current. These gaps reduce the energy absorbed during operation, allowing for fewer valve elements, shorter arrester length, and reduced voltage levels.