File Name: difference between surge arrester and lightning arrester .zip
- Lightning Arrester
- The Difference Between a Lightning Arrester & Surge Arrester
- Understanding the Arrester Datasheet
Part of selecting a good quality arrester is understanding the published data. A good quality supplier will fully disclose the relevant data in a format that is comprehensible and user-friendly. This article is a guide to understanding the arrester datasheet and what is behind it. In every arrester datasheet, you will find a most important table about the discharge voltage of the arrester in question. This table documents how well the arrester clamps lightning and switching surges, which is the fundamental purpose of arresters. This example is for a station class arrester but can be used to understand all discharge voltage tables of all arresters. It is an AC rating and should in all circumstances be higher than the maximum line-to-ground voltage of the system to which it will be applied.
The Difference Between a Lightning Arrester & Surge Arrester
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Surge arresters are voltage limiting devices used to protect electrical insulation from voltage spikes in a power system. Similar to how a fuse functions to protect an electrical system from damage due to overcurrent conditions, the job of a surge arrester is to protect the system from damage due to overvoltage conditions. In the past surge arresters were called lightning arresters, this name was based on their primary objective of protecting electrical insulation from lightning strikes on the system. The more generic term "surge arrester" is now used to encompass overvoltage conditions which can occur from numerous other sources, such as switching operations and ground faults. Everything from personal computers to HV transmission and distribution systems are susceptible to electrical surges and their destructive effects. A "surge" on an electrical system results from energy being impressed on the system at some point, which can result from lightning strikes or system operations. The impressed energy travels throughout the system in the form of waves, with speed and magnitude that vary along with the parameters of the system.
Lightning arrestor is installed outside and the effect of lightning is grounded, where as surge arrestor installed inside panels comprising of resistors which.
Understanding the Arrester Datasheet
All the terms in the electrical industry can be confusing. Even the professionals are confused sometimes. You might have heard the terms lightning arrester and surge arrester.
Surge arrester is used to protect the circuit or electrical equipment from high voltage transient or electrical surges. It may damage the electrical equipment. In order to avoid this, the surge arresters are normally used. Lightning arrester works like surge arrester from outside of the conductor. They absorb the electrical surges in the transmission tower itself.
A surge arrester is a protective device for limiting voltage on equipment by discharging or bypassing surge current. It prevents continued flow to follow current to ground and it is capable of repeating these functions as specified per ANSI standard C An arrester does not absorb lightning or stop lightning.
What is a surge arrester?
A surge arrester is a device to protect electrical equipment from over-voltage transients caused by external lightning or internal switching events. Also called a surge protection device SPD or transient voltage surge suppressor TVSS , this class of device is used to protect equipment in power transmission and distribution systems. For consumer equipment protection, different products called surge protectors are used. The energy criterion for various insulation material can be compared by impulse ratio. A surge arrester should have a low impulse ratio, so that a surge incident on the surge arrester may be bypassed to the ground instead of passing through the apparatus. 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.
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