What does a surge arrestor do?

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 C62. 11. An arrester does not absorb lightning or stop lightning.

What is MCOV?

MCOV stands for the Maximum Continuous Operating Voltage. COV or UC stands for Continuous Operating Voltage. They represent the power frequency voltage that may be continuously applied to a surge arrester.

What is ZnO surge arrester?

Definition: The arrester which uses zinc oxide semiconductor as a resistor material, such type of arrester is known as a metal oxide surge arrester or ZnO Diverter. This arrester provides protection against all types of AC and DC over voltages.

Where do I put SPD devices?

In an electrical systems, surge protection devices (SPDs) are usually installed in tap-off configuration (in parallel) between the live conductors and the earth. The operating principle of SPD can be similar to that of a circuit breaker.

What is UC in SPD?

The maximum continuous operating voltage (Uc) of a protection device should provide a safety margin above the nominal voltage of the supply in which it is installed.

What are the types of surge arresters?

There are three classes of power system surge arresters: station-, intermediate-, and distribution-class.

Why is a lightning arrester needed?

A lightning arrestor installed on the exterior of a building can prevent structural damage to your property due to lightning and similar discharges. This can save you a huge amount of money if your property sees regular exposure to lightning due to location, materials, or other factors.

What is Rod gap arrester?

Rod Gap Arrestor: In such type of arrester, there is an air gap between the ends of two rods. One end of the arrester is connected to the line and the second end of the rod is connected to the ground. The gap setting of the arrester should be such that it should break before the damage.