EPGC 202 FE4 Epoxy Fiberglass Board: Main Applications in Transformer and Switchgear Manufacturing

EPGC202 FR4 epoxy fiberglass board is an electrical insulation material widely used in high-voltage and low-voltage electrical equipment, especially in the manufacture of transformers and switchgear. The performance of this material directly affects the operational reliability, safety, and service life of the equipment.

This article will introduce the material properties of EPGC 202 FR4 and explain its specific applications in transformers and switchgear.

What is EPGC202 FR4 Epoxy Fiberglass Board?

EPGC 202 (FR4) is a laminated insulation board with epoxy resin as the matrix and fiberglass cloth as the reinforcement. Its performance conforms to EN60893 and NEMA FR4 standards. This material possesses good machinability and stable electrical properties, allowing for long-term use in electrical equipment.

Its main characteristics include: 

Excellent electrical insulation properties 

High mechanical strength and impact resistance 

Good heat resistance and flame retardancy 

Low water absorption and dimensional stability 

Suitable for CNC machining and custom parts production

Based on the above characteristics, EPGC 202 FR4 has become one of the commonly used insulation materials in the manufacture of power equipment.

Main Applications of FR4 EPGC202 in Transformer Manufacturing

Transformers are critical equipment in power systems, and their internal insulation components must withstand the combined effects of electric fields, temperature, and mechanical forces. Due to its comprehensive performance, EPGC 202 is used in multiple parts of transformer manufacturing.

1. Transformer Insulation End Rings and Spacers

In oil-immersed transformers, the winding ends need to withstand axial clamping forces and electric field stresses.

Applications: EPGC 202 is often processed into end rings (pressure rings) and insulation spacers.

This material has high compressive strength, maintaining structural stability under winding operation or short-circuit conditions. Simultaneously, its smooth surface and stable insulation properties contribute to the isolation between high-voltage and low-voltage windings.

2. Insulation between Core and Clamping Components

To prevent short-circuit loops between the core and metal clamping components, insulation components are required between them.

Applications: Used for insulation plates in core clamping components.

EPGC 202 exhibits excellent machinability, allowing for precise drilling and milling without cracking under high voltage, ensuring reliable core grounding (single-point grounding) and preventing circulating current faults caused by multi-point grounding.

3.Off-Charge Tap Changer Support

Transformer tap changers require a support structure to maintain stable position.

Application: Used for manufacturing tap changer mounting brackets and insulation components.

This material has good rigidity, supporting the switch contacts to maintain accurate alignment and reducing contact problems caused by vibration.

4.Lead Wire Fixing Plate

High and low voltage leads of the transformer need to be fixed after being led out to prevent displacement.

Application: Used for manufacturing lead wire clamps.

Its good machinability allows it to be processed into different shapes as needed, used to fix conductors and maintain insulation from the tank or core.

Main Applications of EPGC202 in Switchgear Manufacturing

In the manufacturing of switchgear (such as circuit breaker cabinets and load switch cabinets), especially medium and high voltage switchgear, there are certain requirements for the arc resistance and structural strength of the insulating materials. EPGC 202 can be applied to several components.

1. Isolation Plates and Arc Separators

In air-insulated switchgear, insulating components are required between phases and between phase and ground.

Applications: Used for busbar supports, phase isolation plates, and arc separators.

This material has flame-retardant properties. In the event of an internal arc fault, it can provide a certain degree of isolation, reducing arc propagation, and also helps prevent foreign objects from contacting live parts.

2. Circuit Breaker Mounting Base

Frame-type circuit breakers or fixed vacuum contactors need to be mounted on a base.

Applications: As a mounting base.

Using EPGC 202 insulating board as a base simplifies the equipment structure and allows it to withstand the mechanical forces generated during circuit breaker opening and closing.

3. Insulated Linkage Rods in Operating Mechanisms

Some switchgear operating mechanisms require the transmission of torque via linkage rods while maintaining insulation from live parts.

Applications: Manufacturing insulated pull rods or linkage rods.

This material possesses certain tensile and torsional strength, enabling it to transmit operating forces and meet the requirements of mechanical operation.

4. Terminal Blocks and Support Beams

The copper busbars inside the switchgear require support and fixation components.

Applications: Used for busbar clamps and support beams.

Its mechanical strength and low moisture absorption allow it to maintain stable surface resistance in humid environments, helping to prevent creepage.

If you need to purchase EPGC202 FR4 epoxy fiberglass boards, it is recommended to choose a supplier with mature production capabilities and processing experience to ensure product quality and stable supply.

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