GPO-3 Fiberglass Sheet (UPGM-203)

GPO-3 fiberglass board or GPO3 sheet, also widely recognized as UPGM-203, stands as a leading solution for critical electrical and mechanical support applications. This high-performance thermoset laminate is engineered to deliver an optimal balance of electrical insulation, mechanical strength, and thermal stability, making it an indispensable component in various industrial sectors, particularly within the energy transmission and distribution infrastructure.

Introduction of GPO-3 Insulation Board

GPO-3 is a specialized fiberglass-reinforced unsaturated polyester laminate. It is manufactured by impregnating non-alkali glass fiber mats with an unsaturated polyester resin paste, combined with appropriate additives, and then subjecting the mixture to high-temperature pressing to form rigid sheet insulation material. The resulting composite material is characterized by its excellent electrical and mechanical properties, making it suitable for a wide range of demanding environments. While commonly available in white and reddish-brown, white GPO-3 boards are particularly sought after for specific applications, including those within 33kV transformers.

• Material:  Fiberglass-reinforced unsaturated polyester resin

• Thickness: 0.8~100mm

• Size: 1020 mm x 1220 mm, 1020 mm x 2040 mm or customized

• Colors: White, brownish-red, etc.
  
  

  Test Item	Unit	Test Result	Test Method
  Tensile strength	MPa	133	ASTM D638-03
  Tensile modulus	MPa	1.03 × 10⁴	ASTM D638-03
  Flexural strength	MPa	212	ASTM D695-02a
  Electric strength perpendicular to laminations (In oil at room temperature, rapid voltage rise)	MV/m	20.7	ASTM D149-97a
  Flashover voltage perpendicular to laminations (In air, rapid voltage rise)	kV	29	ASTM D149-97a
  Breakdown voltage parallel to laminations (In oil at room temperature, rapid voltage rise)	kV	79	ASTM D149-97a
  Arc resistance	s	186	ASTM D495-99
  Comparative tracking index		CTI 600	UL746A
  Insulation resistance	Ω	6.1 × 10¹³	ASTM D257-99
  Flammability	Class	V-0	UL 94:2006
  Oxygen index	%	44.8	ASTM D2863-10
  Density	g/cm³	1.81	ASTM D792-00

Features and Benefits of GPO-3 insulation sheet

GPO-3 insulation board offers a compelling array of features that contribute to its superior performance:

•Exceptional Electrical Insulation: Possesses high dielectric strength and arc resistance, maintaining stable electrical properties even under high humidity conditions. This is crucial for preventing electrical breakdowns in high-voltage systems.

•High Mechanical Strength: Exhibits excellent flexural, impact, and tensile strength, providing robust structural support and resistance to mechanical stress and vibration.

•Flame Retardancy: Typically meets UL94 V-0 flame retardant standards, enhancing safety in electrical installations by minimizing fire propagation.

GPO-3 Insulation Machined Parts

Chengrui can provide GPO-3 machined parts, customized according to customers' provided drawings

Applications in High-Voltage Systems

The versatile properties of GPO-3 insulation board make it ideal for numerous applications, especially in 33kV transformers and other high-voltage electrical apparatus:

•Transformers: Utilized as internal structural components, such as phase barriers, coil end insulation, and support blocks, particularly in 33kV transformers where reliable insulation is critical.

•Switchgear: Employed for safety baffles, phase barriers, insulating supports, and busbar supports.

•Circuit Breakers: Used for phase separators and arc extinguishing chamber partitions.

•Motor and Generator Components: Applied in motor armature parts, movable cover plates, slot wedges, and gaskets.

•Other Electrical Equipment: Found in various low-voltage electrical appliances, including AC contactors and explosion-proof electrical equipment, as insulating structural parts.

•Dimensional Stability: Offers excellent dimensional stability, ensuring that components retain their shape and fit precisely over time, even under varying environmental conditions.

GPO-3 insulation board (UPGM-203) offers a robust and reliable solution for the demanding insulation requirements of 33kV transformers and other high-voltage electrical systems. Its unique combination of electrical, mechanical, and thermal properties, coupled with excellent flame retardancy, ensures enhanced safety, operational efficiency, and longevity of critical electrical infrastructure. When selecting insulation materials, GPO-3 stands out as a superior choice for applications where performance and reliability cannot be compromised.