How to distinguish an insulator from a surge arrester on a tower

Distinguish between insulators and lightning arresters on towers from the following angles:

1. The shape is different. The one with the terminal is the arrester, and the one without the terminal is the insulator. There are many types of insulators and come in different shapes.

Although the structure and shape of different types of insulators are quite different, they are all composed of two parts: insulators and connecting fittings. There are many kinds of arresters, including metal oxide arresters, line-type metal oxide arresters, line-type metal oxide arresters, line-free metal oxide arresters, fully insulated composite jacket metal oxide arresters, and detachable arresters.

2. The installation position is different. Insulators are installed on conductors of different potentials or between conductors and grounding members to withstand voltage and mechanical stress. Surge arresters are usually connected between the grid conductor and the ground wire, but sometimes they are also connected next to the windings of the appliance or between the conductors.

Surge arrester: <>

Insulator: <>

3. The role is different. An appliance used to protect electrical equipment from high transient overvoltages and to limit the freewheeling time and often the freewheeling amplitude. This term includes any external clearance necessary for the proper functioning of the appliance during the operation of the installation, whether or not it is a part of the whole.

An insulator is a special type of insulation control that can play an important role in overhead transmission lines. In the early years, insulators were mostly used in power poles, and slowly developed into a lot of disk-shaped insulators hung at one end of the high-type high-voltage wire connection tower, which was to increase the creepage distance, usually made of glass or ceramic, and was called insulators.

The insulator is an umbrella-shaped ceramic sleeve that looks like a tower from below. The higher the voltage level, the thicker and larger the insulator, and the ceramic color is tan. The installation position is 2-5 meters below the top of the tower, on both sides of the tower, one on each side of each phase.

The arrester is a needle-shaped metal rod or copper bar, which is installed vertically at the top of the tower, and there is only one pole per tower, which is not obvious but can be seen carefully.

Arresters generally have an insulated base, and there will be leads at the low voltage end.

1. The installation position is different.

Insulator: Installed between conductors of different potentials or between conductors and grounding members that can withstand voltage and mechanical wide force.

Surge arresters: Surge arresters are usually connected between the grid wires and the ground wire, but sometimes they are also connected next to the windings of electrical appliances or between the wires.

2. Different forms.

There are many types of insulators and come in different shapes. Although the structure and shape of different types of insulators are quite different, they are all connected by insulators.

It is composed of two parts.

Arrester: There are many kinds, including metal oxide arrester, line type metal oxide arrester, and gapless line type metal oxide.

Arrester, fully insulated composite jacket metal oxide arrester, detachable arrester.

The insulator plays the role of traction and support for the conductor in the transmission line, and the arrester mainly plays a protective role in the road: The insulator string is the weakest link in the insulation structure of the transmission line tower, and when the wire is subjected to a winding or lightning strike at the tower head and the file to cause a counterattack, the strong short-circuit current flowing through the surface of the insulator after the power frequency arc is built, therefore, first, the switch will block the short-circuit current and the branch will ablate the contact, increase the number of overhauls and require higher costs; Second, the insulator (string) flashover, after flowing through the power frequency short-circuit current, the end is seriously damaged, the interface deteriorates, ablation, and the insulator (string) will be replaced by a power outage, which not only increases the maintenance workload, but also needs to increase the operating cost. After the installation of the line-type lightning arrester, it can greatly and effectively improve the lightning resistance level, protect the Qingqing sensitive edge (string), reduce the trip rate, improve the reliability of power supply, and significantly reduce the maintenance and operation costs and maintenance workload.

To put it simply, the arrester is a conductive positive block, the insulator is a non-conductive object, and the arrester is installed on high-rise buildings and flammable objects, which conducts the current of lightning to the ground through the path, and the shunt insulator is not conductive.