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Everything You Need to Know about Porcelain Stay Insulators

Pulished on Dec. 13, 2021

Porcelain Stay Insulator


What is a Stay Insulator?

Stay insulators are a form of insulators that are utilized on the stay path. They are modeled to supply insulation in case the wire cuts and falls on the ground. The stay insulator will guarantee that the wires don’t contact the ground.


Knowing the performance of a stay insulator is important. There are some holes in the body of the stay insulator. The two pieces guy grips go through from the body in the opposite path. The guy grip will wrap the main wire to create the connection. The connection path isn’t confirmed. For different types, there are various ways to connect, and any manufacturer can make the insulator fittings according to the customers’ requirements and applications.


The importance of the stay insulator is commonly witnessed once the poles fall on the ground or when the main wires accidentally cut because of the excess mechanical load. It is among the most suitable insulators for overhead transmission lines that you should install. The stay-type insulator is normally installed in the middle of the stay path. In the case the pole fails, the insulator will ensure that the lower part of the system will have no voltage.


Why is Porcelain Used for Stay Insulator?

Obviously, there are other substances that can be used to produce stay insulators. Here are the top reasons which make most insulator manufacturers employ porcelain.


  • A good insulator should supply adequate resistance to electricity and Porcelain material has high insulation resistance. This feature means that there will be no leakage of the electricity to the ground.


  • Porcelain has mechanical and physical strength. Fundamentally, porcelain material is physically strong to control the weight and tension of the conductors. Its heavy mechanical strength also means that it can tolerate different vagaries of nature.


  • Porcelain is impervious. It should be noted that a stay insulator is installed outside. So, it is probably to be exposed to water and other unwanted liquids. Porcelain is not penetrable hence no liquid can get inside it to face the flow of current. Generally, it can be said that fluids and gases cannot find a simple way into the porcelain.


  • Porcelain has great dielectric strength. As a result, with a large dielectric strength, a porcelain insulator can withstand high voltage load and voltage stress.


  • Porcelain is non-reactive to chemical variation. The physical features of a porcelain stay insulator prevent it from simply reacting with chemical changes and other impurities. This is essential since some impurities can influence the conductivity of a wire leading to the leakage of electricity.


  • Porcelain is resistant to a great temperature change. The electrical and physical characteristics of porcelain material are not influenced by extreme temperature change. This is because high temperatures can influence the electrical conductivity of a substance. With this feature, it means that a porcelain stay insulator can perform anywhere regardless of the climatic and environmental variations.


How Does a Stay Insulator Work?

A usual stay insulator has two holes that are placed on opposite sides of each other. Pieces of stay wires enter within one hole and exit through the other. Guy wires are employed to support the grip and ensure that there is a complete connection between the stay insulator and stay wire.


So, what happens when the wires find themselves on the ground? Let’s say the tower or pole fails and everything breaks. The wires will be completely insulated and No voltage will go to the earth.


A dead-end or anchor tower or pole is employed where a straight sector of line ends or angles off in another direction. These poles should tolerate the lateral (horizontal) tension of the long straight sector of wire. In order to withstand this lateral load, some strain insulators are used. Shackle insulators are also employed as strain insulators for low voltage lines (less than 11 kV). Although for high voltage transmission systems, strings of cap-and-pin or disc insulators are employed, joined with the cross-arm horizontally. Once the tension load in lines is extremely high, two or more strings are employed in a parallel configuration (such as a long river span).


The stays are to be insulated from the ground at a certain height for low voltage lines. The insulator applied in the stay wire is known as the stay insulator and is commonly made of porcelain and is so modeled that in case of cut-off of the insulator, the main wire will not fall to the ground.


Find the best Porcelain Stay Insulator

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Each suspension insulator undergoes rigorous electrical testing & mechanical testing before shipment.