List of Overvoltage Protection Device and Their Function

Arcing Horn Diagram, List of Overvoltage Protection Device

Overvoltage fault is a very common and frequently happens electrical fault. Overvoltage fault occurs when the voltage rises above the maximum limit voltage level of a circuit. According to the time duration, overvoltage fault can be divided into different types such as,
  1. Transient Voltage
  2. Surge Voltage
  3. Spike Voltage
  4. Permanent Overvoltage
Anyway, in this article, we are going to see the list of all overvoltage protection devices and their function, applications, features.

Here, the list of overvoltage protection devices,
  1. Arcing Horns
  2. Lightning Rod
  3. Spark Gap
  4. Lightning Arrester
  5. Surge Arrester
  6. Transient Voltage Suppression Diode
  7. Metal oxide varistor
  8. Avalanche Diode
  9. Zener Diode

Arcing Horns for Overvoltage Protection

Arcing Horns or Arc-Horn are mostly used with insulators in overhead transmission lines and switching arrangements. Basically, an ARC horn has two projecting conductors very close to each other but not connected. Among these two conductors, one is connected to the live part of the power system and another is connected to the earth or ground. So, in normal condition, no current flow through the ARC horn. But when a high voltage occurs in the power system an ARC is created between two projecting conductors of the ARC horn and it also creates a close path between the live part and the ground. So, current starts flowing from the live to the ground through the ARC horn, and voltage got decreases.

Lightning Rod

Lightning Rod is also known as Lightning Conductor. Basically, it is a metal rod mounted or placed at the top of a building. The main function of a lightning rod is to protect the building from the heavy strike voltage due to lightning. When the lightning occurs near the building, it will hit the lightning rod and all the current will ground through that rod. The lightning rod system contains a metal rod mounted on the top of the building and a rod placed on the ground. These two rods are connected by an earth wire.

Spark Gap

The spark gap is almost similar to an ARC horn. Here, also two conductors are placed nearly to each other and this arrangement is placed in a closed area filled with any gas or air. When the voltage between the two conductors exceeds the breakdown voltage of the filled gas, it got ionized fully. Once the gas is ionized, the resistance will decrease and electric current starts flowing through it. So, this is also connected between the live part of a power system and the ground or earth.

Lightning Arrester

The main function of a Lightning Arrester is to arrest the lightning and give protection against overvoltage produced by lightning. Lightning arresters are mostly used in electrical power transmission systems through overhead lines and telecommunication systems. A lightning arrester has a high voltage terminal that is connected to the live part of the power system and a low voltage terminal connected to the ground or earth. So, when a surge voltage occurs due to the lightning or switching, the lightning arrester diverts the flow of current from the live part to the ground. So, the surge voltage is minimized quickly.

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List of Overvoltage Protection Device and Their Function List of Overvoltage Protection Device and Their Function Reviewed by Author on 11/04/2021 Rating: 5
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