Is there a difference between a surge protector and a lightning arrester?

- Aug 19, 2019-

Surge protectors and surge arresters are lightning protection devices used to limit transient lightning strikes. So, is there a difference between the two?

1. Outside China

There is no difference between a surge protector and a lightning arrester. The surge protector is the definition of this type of device by the International Electrotechnical Commission (IEC), which is the Chinese translation of SPD (Surge Protection Device). The arrester is the definition of lightning protection device in the domestic lightning protection industry. It is the Chinese language. Both are a meaning, the same type of product, has the same effect, no difference.

2. In China

Domestic lightning protection technology originated in the 1980s. During the same period, foreign lightning protection products and technologies were also introduced. The international IEC standards have greatly affected the development of the lightning protection market. There has also been a differentiation in the application of lightning protection products, and new names have been given to the names and concepts of lightning protection products. In practical applications, a surge protector refers to a lightning protection device that is used in a low-voltage power distribution system and a weak current system to limit transient over-voltage. The lightning arrester refers to a lightning protection device used in a specific industry and application environment in a high-voltage power distribution system. In China, the main differences between the two are as follows:

First, the rated voltage of the two is different from the nominal discharge current.

The rated voltage range of the arrester is 0.28kV~3kV, and the rated voltage range of the surge protector is 5V~1.2kV; the nominal discharge current of the arrester is 20kA, 10kA, 5kA, 3kA, 1kA, the nominal of the surge protector The discharge current is 120kA, 100kA, 80kA, 60kA, 40kA, 20kA, 10kA, 5kA, 3kA, and the like.

Second, the protection range model category is different.

Surge protectors are generally defined for surge protection in low-voltage distribution systems and weak electronic systems. They are generally classified into three categories: power surge protectors, signal surge protectors, and antenna surge protectors. Generally used in transmission lines, power equipment and other places, mainly zinc oxide arresters, exhaust arresters, DC arresters and other types.

Third, the response time is different.

The surge protector's response time is generally between 20-25ns, with fast response time and high protection performance, which is suitable for the fine protection of more sensitive electronic equipment. The response time of the arrester is generally above 100 ns, which is suitable for the protection of transmission lines. This also determines the difference between the object to be protected and the installation location.

Fourth, the manufacturing process and materials are different.

The arrester is mostly made of zinc oxide lightning protection components, and is made of insulating silica gel. The surge protector is generally composed of varistor, semiconductor device, electrostatic protection component, outer casing plastic and special potting material. Big difference.