Porcelain Insulators

Your Professional Porcelain Insulators Supplier

Cowin Electrical Co., Ltd. is a leading enterprise specializing in the export and manufacturing of electrical products. Our comprehensive product range includes distribution switchgear control equipment, high and low voltage electrical appliances and accessories, dropout fuses, surge arresters, disconnectors, insulators, power fittings, hardware tools, wiring terminals, and distribution boxes.

Rich Experience:With over 15 years of extensive experience in production and export, we have established a solid reputation in the industry.

Custom Service:We offer OEM/ODM services to meet your specific requirements, ensuring that the final products align with your expectations.

Professional Team:Our team comprises experienced and skilled designers, including CAD and 3D design specialists, who possess the capability to deliver exceptional designs for your projects.

Quality Control:We have obtained ISO9001 quality management system certification and comply with international standards such as IEC 60099-4, IEC 61643-1, IEC 291, and IEC 282, issued by the International Electrotechnical Commission (IEC).

Specification

ANSI Class/Standard		ANSI 52-9
Unit Spacing (H) - mm		160mm
Nominal Diameter (D) -mm		108mm
Creepage Distance		171mm
Power frequency puncture voltage		80kV
Power frequency flashover voltage	Dry	60kV
	Wet	30kV
Critical impulse flashover voltage	Positive	125kV
	Negative	90kV
Radio influence voltage	Test voltage to ground	7.5kV
	Max. RIV at 1000kHz	50kV
Rated E & M failing load		45kN
Tension proof load		22kN
Impact strength		5N.m
Weight		2.6kg

Advantages of Porcelain Insulators

Environmentally friendly

Porcelain insulators are generally environment are friendly. Thus when they are disposed of, they don't harm the environment. They are made of natural materials and can be safely dumped anywhere. The same can be easily recycled if you're using ceramic porcelain insulators.

High electrical strength

Compared to polymer, the electrical strength of the porcelain insulators is higher. Thus it is always advisable to use the same instead of polymer. Polymer insulators do not have a longer life. On the contrary, using porcelain is a better option as it helps to generate a good amount of lifeline.

Suitable for all temperature ranges

Ceramic insulators are suitable for extreme cold and hot temperatures. It is suitable for environments where dust and salt are high in the air. The insulators generally show a stable result for the same. Moreover, they are corrosion resistant and can be used for outdoor purposes.

Applications of Porcelain Insulators

Transmission and distribution line insulators
Insulators are used in power transmission and distribution lines to support and insulate conductors. Suspension and clevis insulators are common in this type of application, and ensure that electrical current is not transmitted to the supporting structures, preventing short circuits and system failures.

Isolators in electrical substations
Electrical substations, which are installations where electrical energy is transformed and distributed, also require the use of insulators. Support and grounding insulators are commonly used in these installations to ensure the mechanical stability and safety of electrical equipment and systems.

Isolators in power generation systems
Isolators are also used in power generation facilities, such as thermal power plants, hydroelectric power plants, and solar or wind power plants. In these cases, insulators protect and insulate electrical equipment and components, ensuring safe and efficient operation.

Isolators in industrial electrical equipment
In industry, insulators are used in a wide variety of electrical equipment, such as motors, generators, transformers and control devices. Isolators ensure that this equipment operates safely and efficiently, protecting workers and preventing damage to installations.

Insulators in lightning protection systems
Grounding insulators are essential in lightning protection systems, such as lightning arresters and grounding installations. These insulators safely connect metallic parts to earth, protecting people, equipment and structures from electrical surges and discharges.

Isolators in transport systems and electric vehicles
In the growing market for transportation and electric vehicles, such as trains, trams and electric cars, insulators play a key role in protecting and insulating electrical components, ensuring safe and efficient operation.

Main Materials of Porcelain Insulators

Clay

Typically a high-purity kaolin clay, it provides the essential plasticity required for easy shaping before firing, while also contributing crucial aluminosilicate compounds to the final ceramic matrix.

Quartz

This component provides a high-purity source of silicon dioxide (SiO2), serving as the foundational element for the formation of the glassy phase. It crucially ensures the final ceramic body achieves both high dielectric strength and a low coefficient of thermal expansion.

Feldspar

Functioning primarily as a fluxing agent, feldspar effectively lowers the required melting temperature during the intense firing process. This facilitates the creation of a highly dense, glass-like phase that significantly minimizes the material's overall porosity and susceptibility to moisture absorption.

Comparison of Porcelain Insulators, Glass Insulators, And Composite Insulators

Feature	Porcelain Insulators	Glass Insulators	Composite Insulators
Primary Material	Electrical Ceramic (Clay, Quartz, Feldspar)	Toughened Glass	Silicone Rubber or EPDM Housing, Fiberglass Rod Core
Failure Indication	Highly concealed, requires instrumented testing	Highly visible, shatters immediately upon electrical puncture (self-shattering)	A highly concealed, internal core rod may fracture
Mechanical Advantage	High compressive strength, excellent rigidity, and creep resistance	High residual mechanical strength (retains most strength after failure)	Extremely high tensile strength, lightweight
Hydrophobicity/AntiContamination	Hydrophilic, requires glazing or coating for improvement	Hydrophilic, but the smooth surface is easily cleaned by rain	Extremely hydrophobic, excellent anti-contamination performance
Weight	Heaviest (higher transportation and installation costs)	Medium weight	Lightest (lowest installation costs)
Expected Lifespan	Very long (over 50 years), fully UV-resistant	Very long (over 50 years), fully UV-resistant	Shorter relative life (under 30 years), susceptible to UV and corona aging

Customizable Options

Voltage Rating

11 kV, 33 kV, 66 kV, 110 kV

Color

Brown, gray, white

Disc Diameter

160–300 mm

Packaging and Shipping

Packaging	Export standard package or special package as the requirement of customers.
Shipping	We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc.

FAQ

Q: What are porcelain insulators?

A: Porcelain insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4–10 kV/mm.

Q: What is the lifespan of a porcelain insulator?

A: Porcelain insulators are an essential component of transmission lines as they sustain the load of conductor wires and promote electric insulation with a lifetime of 30 to 60 years. ...

Q: How to identify porcelain insulators?

A: Most porcelain insulators are incuse marked, that is, a stamp was used to impress the manufacturer's logo into the leather hard clay prior to firing.

Q: What voltage is a porcelain insulator?

A: High Voltage Porcelain Insulators are essential components used in electrical transmission and distribution systems to insulate and support conductors at high voltages (typically from 11 kV to 765 kV or higher).

Q: Can porcelain insulators be repaired?

A: As with glass insulators, a variety of methods have been employed to repair porcelain specimens. The techniques include regluing, filling chips and gaps, and major reconstructions.

Q: What are common porcelain insulator problems?

A: Under the influence of their structure, porcelain insulators are prone to mechanical damage and cracks, which will reduce their insulation performance. After a long-term operation, crack expansion will eventually lead to breakdown and safety hazards.

We're professional porcelain insulators manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy high-grade porcelain insulators for sale here from our factory. Contact us for more details. overhead meter socket, shoe clamp, overhead meter base