Why Choose Us?
Advanced Equipment
Our Factory is well equipped with all worldclass facilities, such as programmable tensile load testers, crimping systems with acoustic emission detectors, fully automated rubber injection moulding machines, vulcanization testers, a complete set of power frequency transformers and impulse voltage generators.
Wide Product Range
Main products include composite insulators for electric power lines from 10 to 800kV, composite insulators for electric railways, phase spacers, disconnecting switches, bushings, surge arrestors, etc. Our products have a good reputation in international markets.
Complete Qualifications
We implemented the ISO 9001:2015 Quality Control and the ISO14001:2015 environmental management systems. DCI's management and comprehensiv ecompetitiveness, quality of products and services, benefited enormously.
Broad Market
DCI's products have been exported to Europe, America, Oceania, Africa and Asia. We also have long-term cooperation with a lot of large international electricity companies like TYCO, ABB, AREVA, ALSTOM, PLP, Victor, EB, NTP and Siemens.
A composite insulator is a special insulation control component that plays an important role in overhead transmission lines. There are many types of polymer insulators. Composite insulator can be divided into: composite suspension insulator, line post composite insulator, pin type composite insulator, post composite insulator, composite railway insulator, composite hollow insulator.
Benefits of Composite Insulator
The insulator's design and material properties translate into several operational advantages:
• Extended Creepage Distance: At 580 millimeters, the insulator offers a longer creepage distance, which reduces the risk of flashover during storms.
• High Withstanding Voltage: Capable of withstanding a lightning impulse of 190kV and a power frequency voltage of 70kV, the insulator is well-suited for high-voltage applications where reliability is paramount.
• Durability and Maintenance: The composite material is resistant to cracking and wear, ensuring that the core rod and fittings remain securely in place. This durability, coupled with the low-maintenance nature of composite insulators, translates into a long service life with minimal upkeep. Additionally, the temperature rise test result was 9K superior to the standard, highlighting its superior thermal resistance and reliability under various operating conditions.
Materials of Composite Insulators
Composite insulators have been introduced as a good alternative to ceramic and glass insulators. After nearly 30 years of launching the first type of composite insulators and making design improvements and consuming materials, they are used as well-known and suitable products in HV.
In the resin insulators, the oxygen composition with certain plastics is made in the form of a polyidison; that is, together with the composition, large molecules are produced. In order to harden the compound, usually additional materials such as quartz are added, and finally, the resin is made up by heating and casting. These types of insulators are not used in open space due to their lack of ultraviolet radiation in the sun and are used only in interior spaces and inside panels. Composite insulators consist of at least two insulating materials; one of which is the task of providing electrical properties and the other providing mechanical properties.
What Is the Voltage of Composite Insulator?
|
Item description |
11 kV Silicone composite Pin insulator requirements |
|
Type |
Silicone composed pin insulator complete with spindle, nut and washer |
|
Nominal Voltage (kV) |
11 |
|
Highest System Voltage (kV) |
12 |
|
Min Nominal Creepage Distance ( mm ) |
280 |
What Is the Construction of Composite Insulator?
Composite insulator can be widely used in contact power grids, high pressure devices and transmission lines.
The basic structure principle of the composite insulators is very simple. The center of the insulator is a glass fiber reinforced plastic rod, and the end of the insulator is fixed with a metal ring. In order to connect with the structural fittings and structures of the electrical device.
In order to prevent the influence of the surrounding environment and to produce the leakage traces on the surface of the mandrel under the action of the leakage current, a polymer is coated on the mandrel.
Composite Insulator Type Selection Considerations
Selecting the appropriate type of insulator involves considering several factors
Weight Consideration
Insulators must support the vertical load of the conductors and hardware. Composite types are preferable if a lighter insulator is desired. Ceramic or glass insulators may be suitable for applications with less stringent weight requirements.
Voltage Rating
Insulators are chosen based on the voltage level they are designed to handle. Each model of ceramic, glass, or composite insulator corresponds to a specific voltage rating. The required voltage level must be considered when selecting an insulator.
Environmental Conditions
The choice of insulator should also be informed by the environmental conditions of the installation site. After narrowing down options based on weight and voltage, the most suitable insulator can be chosen by evaluating its tensile strength, creepage distance, and anti-contamination properties against the environmental requirements.
Why Composite Insulator Has Better Hydrophobicity Than Porcelain Insulator?
Silicone rubber is a synthetic organic material with excellent physical and electrical properties. Ceramics / porcelain have good hydrophilic, because ceramics / porcelain and water belong to the inorganic matters.
Insulators made of silicone rubber have good hydrophobicity. Raindrops roll off more easily on silicone insulator surface than on the surface of porcelain insulator. And filth also lost faster on silicone insulator than porcelain insulator. In light rain, when water volume is not large, the filth on silicone insulator surface will be washed away, but this does not happen to porcelain insulator.
Due to the effect of hydrophobicity, the filth dissolution rate of silicone insulator surface is obviously much lower than that of porcelain insulator. On the surface of silicone insulator, the dissolution rate of electrolytes is greatly slowed down, some electrolytes begin to be gradually lost before all electrolytes are dissolved.
What Are the Polymers in Composite Insulators?
Polymer insualtor has Superior electrical performance, and high mechanical strength. The FRP rod of Composite Insulator, has good tensile and bending strength,which is 2 times higher than that of ordinary steel, and 8-10 times higher than that of high-strength porcelain materials.Thus will effectively improve the reliability of safe operation
Composite Insulator has good anti-pollution performance: strong anti-pollution flashover voltage. Its wet withstand voltage and pollution withstand voltage are 2~2.5 times of the same creepage distance of porcelain insulator. There is no need to clean, and it can operate safely in heavily polluted areas.
Composite Insulator has small size, light weight (only 1/6~1/9 of the same voltage levelof porcelain insulator), light structure, easy to transport and easy to install.
The silicone rubber umbrella of Composite Insulator has good water-repellent properties.Its overall structure will keep the internal insulation from moisture.It does not require preventive insulation monitor tests. It also does not require cleaning. So that reduces the workload of daily maintenance.
Composite Insulator has good sealing performance, strong electrical corrosion resistance. The sillion rubber shed has a level of TMA4.5 resistance to trace tracking. The shed has good aging resistance, corrosion resistance, and low temperature resistance. Making it able to be used in -40℃~-50℃ areas .
Composite Insulator has strong impact resistance and shock resistance, good brittle resistance and creep resistance. It is not easy to break. It also has high bending strength, high torsion strength. So that it can withstand internal pressure.And it can be combined with porcelain and glass insulators Interchangeability.
Precautions for Installation of Composite Insulators
1. Insulators should be stored in a dry warehouse, and rodent prevention measures should be taken. The storage location should avoid oil and petrochemical substances.
2. During transportation, hardware and other heavy objects should not be directly stacked on the insulator to avoid damaging the insulator sleeve. Therefore, the packaging box should only be opened at the installation site.
3. When opening the box, be careful not to let sharp tools cut the umbrella skirt. The following figure shows the incorrect operation.
4. At the installation site, for longer insulators, do not drag them on the ground. The following figure shows the incorrect operation.
5. For products of 330kV and above, attention should be paid not to excessively bend the insulator to avoid excessive bending stress on the core rod. The following figure shows incorrect operation.
6. When manually handling long insulators, two or more people should handle them to avoid the middle part sagging and causing scratches on the surface of the umbrella skirt, which will affect the electrical performance and service life of the insulator. The following figure shows the correct operation.
7. When lifting insulation, it is not allowed to directly hang the rope on the umbrella cover, but should be hung on the end attachment, that is, the ball socket.
8. When installing the grading ring, it is important to note that the smooth surface of the grading ring should face the insulator umbrella skirt.
9. Do not step on or climb composite insulators.
10. Do not step on the installed equalizing ring or hang ropes or heavy objects on the equalizing ring to avoid loosening or damaging the surface.
11. During the installation process, it is necessary to avoid excessive bending or torsional stress on the core rod as much as possible. At the same time, when hanging the line, do not rotate the fixed or loaded insulator.
International Co.,Limited was established in 1996 which focuses on electric products, marketing, services and logistics. It is an important manufacturer and export trader with several decades of experience in designing, researching, manufacturing, testing and logistics. TCI, located in , with the largest port in North-East of China, has strong capacity of technological research and development.
More than 70% of TCI's staff has bachelor degrees or higher. Many senior engineers and technicians are knowledgeable and experienced in the fields of high voltage, macromolecule research and machine manufacturing. We also have a well-established skilled workforce. We have a long-time close relationship with the China Electric Power Research Institute, CESI, all supporting our technological research and development.
We implement the ISO 9001:2015 Quality Control and the ISO14001:2015 environmental management systems. TCI's experience in this competitive market has formulated a well regulated management style for product sales, quality and services.
Ultimate FAQ Guide to Composite Insulator
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