The Application of G10 Epoxy Board in Large Generators

At present, the demand for energy in society is constantly increasing, and the power system has strict requirements for reliability. As the core of the power grid, large generators have very important performance and stability. Among them, the choice of insulating materials directly affects the efficiency, lifespan and operational safety of generators. Among various insulating materials, G10 epoxy board has excellent comprehensive performance and has become a key material indispensable in large generators. This article will analyze the reasons why G10 epoxy board is the industry's first choice and its specific applications and value in generators.

What is G10 Epoxy Board?

G10 epoxy board, whose formal name is G10/FR-4 epoxy glass cloth laminate, is a composite material. It is made by impregnating continuous glass fiber cloth with flame-retardant epoxy resin and then curing it at high temperature and pressure. It is not an ordinary plastic or metal, but an engineering material specifically designed for extreme electrical and mechanical environments.

Its core characteristics include:

- Extremely high mechanical strength and rigidity

- Excellent dielectric strength and high insulation resistance

- Excellent heat resistance

- Moisture resistance and chemical resistance

- Low water absorption

- Excellent dimensional stability

These excellent characteristics can meet the strict requirements of large generators for internal materials.

The Key Applications of G10 Epoxy Board in Large Generators

The internal structure of large generators is complex. G10 epoxy board plays multiple crucial roles within them.

1. Insulation Components and Structural Supports

During generator operation, there are extremely high voltages and strong electromagnetic fields inside. Based on this characteristic, G10 epoxy board is widely used to manufacture the following key components.

Slot wedges: 

This component is used to fix the stator winding coils to prevent them from loosening or vibrating under the action of strong electromagnetic force. The high strength and insulation properties of G10 epoxy board can effectively ensure the long-term stable operation of the coils.

Insulation pads and partitions: 

These two components are placed at the ends of the coils or between different potentials to achieve insulation isolation and mechanical support, thereby preventing short-circuit faults.

Connection plates and support rings: 

These two components are used to support and fix the connecting wires. Their excellent dielectric properties can ensure the safe operation of the equipment in high-voltage environments.

2. Support and Fixation of Coil Ends

When a generator is starting, stopping, or experiencing sudden load changes, its coil ends will bear huge electromagnetic forces. At this time, binding rings, clamps, and supports made of G10 epoxy board can firmly fix the coil ends. This avoids deformation or wear at the coil ends, thereby preventing insulation failure.

Why is G10 epoxy board an ideal choice for large generators?

Compared with traditional insulating materials such as phenolic cloth board and ordinary engineering plastics, G10 epoxy board has significant performance advantages.

1. Excellent electrical performance

High dielectric strength: G10 epoxy board can withstand working voltages of several tens of thousands of volts and instantaneous overvoltages inside the generator, effectively preventing insulation breakdown.

High insulation resistance: Even in high-temperature and high-humidity environments, G10 epoxy board can maintain a high resistivity, ensuring that the leakage current of the equipment is within a very small range.

2. Strong mechanical properties

High strength and high rigidity: G10 epoxy board provides stable support for windings and key components, capable of resisting long-term electromagnetic vibrations and short-term short-circuit impacts, ensuring the integrity of the generator structure.

Excellent dimensional stability: Under temperature changes and humidity fluctuations, the deformation of G10 epoxy board is small. This characteristic can ensure the stability of the insulation gap and avoid component loosening or stress concentration due to thermal expansion and contraction.

3. Excellent environmental tolerance

Water resistance and chemical resistance: The low water absorption of G10 epoxy board ensures stable performance in humid environments. At the same time, it can resist erosion from cooling media (such as hydrogen) and a small amount of oil stains.

Water resistance and chemical resistance: Low water absorption makes it stable in humid environments and resistant to erosion from cooling media (such as hydrogen) and a small amount of oil stains.

Flammability: G10 epoxy board complies with UL94 V-0 standards, effectively preventing the spread of flames and thereby improving the overall fire safety level of the generator.

4. Longevity and High Reliability

The aging rate of G10 epoxy boards is slow, and the performance decay period is long. Therefore, generators using this material have longer maintenance cycles and longer service life, effectively reducing the maintenance cost throughout the entire life cycle.

In the design of large generators, for higher efficiency, greater capacity, and stronger reliability of the equipment, each aspect is crucial. G10 epoxy boards not only serve as an insulating material but also are a key structurally-functional integrated material. It is widely used in the core parts of generators. It provides reliable electrical insulation, mechanical support, and environmental stability, ensuring the safe, efficient, and long-term stable operation of modern generators.