Insulation

 

Insulation

Insulation is essential for the safe and reliable operation of hollow conductors in electromagnets, and insulation materials, design considerations, and proper application methods are crucial to ensure optimal performance and longevity. Insulation prevents electrical shorts, arcing, and eddy current losses, ensuring efficient operation and safety, and the choice of insulation technique depends on various factors including the type of conductor, application requirements, production volume, cost constraints, and desired properties of the insulation. For electromagnets, hollow conductor is often insulated by polyester imide with glass fiber, and then insulated by epoxy casting.

 

 

What are the insulation types for hollow conductors?

 

Hollow conductor with Insulation is essential for the safe and reliable operation of magnets, and it helps to prevent electrical breakdown, improve heat dissipation, protect against environmental factors, enhance mechanical strength, and reduce corona discharge. Without proper insulation, hollow conductors would be susceptible to a variety of problems that could lead to power outages, equipment damage, and safety hazards. Fabmann can help you to choose the most economic way of insulation, and the following insulations are the popular ones for hollow conductor insulation:

 

√ Sintered Polyester Imide Film

√ Polyester Imide Film with Enamel

√ Polyester Imide Film with Enamel + Glass Fiber

√ Polyester Imide Film with Enamel + Industrial Non-woven Fabric

 

All of these insulation materials can give very good insulation performance, in particular, polyester Imide with glass fiber can achieve highest thermal class 240.

 

Why insulation is important to hollow conductors and transformer?

 

Insulation plays a critical role in the performance and reliability of hollow conductors. Here are some of the reasons why insulation is so important, and below is a quick summary:

 

1. Prevents electrical breakdown, the primary purpose of insulation is to prevent electrical breakdown. Electrical breakdown occurs when the electric field strength in the conductor exceeds the dielectric strength of the surrounding material. This can cause arcing, sparking, and other problems that can damage the conductor and cause power outages. Insulation helps to reduce the electric field strength and prevent electrical breakdown.

2. Improves heat dissipation, hollow conductors can generate a significant amount of heat due to the flow of electricity. Insulation helps to improve heat dissipation by providing a barrier between the conductor and the surrounding environment. This helps to keep the conductor cooler and prevent overheating, which can damage the conductor and reduce its lifespan.

3. Protects against environmental factors, hollow conductors are exposed to a variety of environmental factors, such as moisture, chemicals, and pollution. Insulation helps to protect the conductor from these factors by providing a barrier between the conductor and the environment, and it helps to prevent corrosion, degradation, and other problems that can shorten the lifespan of the conductor.

4. Enhances mechanical strength, some types of insulation, such as glass yarn can provide additional mechanical strength to hollow conductors, and fiber glass is very important in applications where the conductor may be subjected to high mechanical stress

5. Reduces corona discharge, corona discharge is a type of electrical discharge that can occur at the surface of a conductor when the electric field strength is high, and it cause energy loss, radio interference, and ozone generation. Insulation helps to reduce corona discharge by smoothing out the electric field around the conductor.

As you know that the winding is the heart of the transformer and the core of the transformer's transmission and conversion of electrical energy, and therefore the reliable winding insulation is the basic guarantee for the long-term safe operation of the transformer. Winding insulation is particularly important for high-voltage transformers because it not only directly affects the insulation performance of the transformer, but also has a great impact on the technical performance and economic indicators of the transformer due to the large proportion of insulation. Fabmann can find the best option for you depending upon your requirements on operating voltage, temperature range, mechanical stress, and environmental conditions. 

Manual Insulation

What factors are important for making insulation for hollow conductors?

Insulating hollow conductors requires careful consideration of the insulation materials, methods, and design factors to ensure optimal performance and reliability. By selecting the appropriate materials and methods, hollow conductors can provide a lightweight, flexible, and efficient solution for various electrical applications, and to achieve this goal, you need to pay extra attention to the following factors:

√ Insulation material, polyester imide offers excellent electrical insulation properties, flexibility, and resistance to environmental factors.

√ Film wrapping, it involves wrapping the conductor with multiple layers of insulation film, providing a customizable and flexible insulation solution.

√ Glass yarn wrapping, it provides additional protection for mechanical work like bending.

√ Insulation thickness, the thickness of the insulation layer is critical for ensuring adequate electrical insulation and mechanical strength. It depends on the operating voltage, environmental conditions, and desired flexibility.

√ Dielectric strength, the dielectric strength of the insulation material determines its ability to withstand high voltage without breakdown. It is an important factor for ensuring the safety and reliability of the conductor.

√ Thermal conductivity, the thermal conductivity of the insulation material affects the heat dissipation from the conductor, and the high thermal conductivity materials are preferred for applications with high current densities.

√ Environmental resistance, the insulation material should be resistant to environmental factors such as moisture, chemicals, and UV radiation to ensure long-term performance.

What are the popular insulation brands?

Fabmann uses world famous insulation material brands such as Du Pont, Weidmann, Isovolta, Kaneka, IVA, ELANTAS & AXALTA, and our testing facility enable us the to detect the winding wires used in transformers, high-speed rail transit traction transformers, wind power generation, special large motors, electrical appliances and electric vehicles, superconducting wires and other fields. To deliver qualified hollow conductor with insulation, Fabmann focuses on quality control based upon EN60851.

Insulation for Hollow Conductor

What are the temp rating class difference between NEMA vs IEC?

NEMA (National Electrical Manufacturers Association) and IEC (International Electrotechnical Commission) are two of the most widely recognized and respected standards organizations in the electrical and electronics industries. NEMA develops standards for a wide range of electrical products and systems, including motors, generators, transformers, switchgear, and control equipment, and both standards cover everything from the design and construction of equipment to its performance and safety requirements. Both NEMA and IEC are popular because they develop high-quality, technically sound standards that promote safety, interoperability, and industry adoption. Their standards are used by manufacturers, utilities, governments, and other organizations around the world, making them essential for the electrical and electronics industries. It's imperative that the engineering, maintenance, and service personnel are familiar with both standards, and there is slight temp rating class as follows: