CG7350MS Circuit Protection

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Gas Discharge Tube Arresters (GDT) are a type of electrical protection device used to protect electrical networks from damage caused by lighting and other natural phenomena. The CG7350MS is one of the more popular and common of these arresters, used both in residential and commercial applications. In this article, we will discuss the application field and working principle of the CG7350MS.

The CG7350MS is a 600 V, Class II gas surge arrester. It is designed for medium voltage overhead line applications in overhead line networks. Typical applications include medium voltage overhead line lightning protectors, distribution lightning arresters and transmission line lightning protection. It is suitable for use in overhead line systems up to 35 kV with a maximum continuous operating voltage of 28.5 kV.

The working principle of the CG7350MS is based on the use of gas technology. It consists of a housing containing a gas filled tube, a spark gap, and a spark gap contact. When the arrester receives an electrical surge, the voltage across the spark gap increases. When the gap voltage reaches a certain level, an arc is formed between the spark gap contacts, which dissipates the energy of the surge. The spark gap then reseats, creating a temporary open circuit, before finally breaking down; this action prevents re-ignition of the arrester.

The CG7350MS is an advanced arrester that utilizes a dual source protection system, consisting of a non-linear D-shaped metal-oxide varistor (MOV) and a spark gap. The MOV provides fast protection against short duration, low-energy transients, while the spark gap provides long duration, high-energy protection against surges generated by lightning and other high-voltage phenomena. In addition, the arrester is designed with a failsafe operation, meaning that if the MOV fails, the spark gap opens automatically, protecting the system from repeat exposure.

The CG7350MS is designed to meet the highest standards of safety and performance for medium voltage overhead line surge protection applications. It is UL-listed and CSA certified, meaning it has been tested and certified for use in a variety of applications, such as outdoor locations and in overhead lines of up to 35 kV. Additionally, its design is such that it offers protection from surges up to 125 kV, making it suitable for use in extreme conditions, such as coastal lightning-prone areas.

Overall, the CG7350MS offers a reliable and efficient solution for medium voltage overhead line surge protection. Its construction utilizes a combination of proven technology and advanced features to ensure maximum safety and performance, while its failsafe design ensures that the system remains protected even in the event of a MOV failure. As such, it is well-suited for use in residential and commercial applications, as well as in overhead line systems up to 35 kV.

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