Transformer Insulation Paper & Pressboard
Electrical Insulation PSP 3050
Electrical insulation PSP 3050 is a premium-grade, natural-coloured pressboard engineered for electrical insulation applications, fully complies with international standards for electrical insulation materials, standard IEC 60641-3-1, IEC type B.2.1B.
Type: Transformer pressboard
Material: 100% unbleached sulphate cellulose
Thermal Class: A Class 105℃
Thickness: 0.8-4.0mm
Sheet size: 1000X2000mm, 2100X4200mm
Description
Product Introduction
Unlike conventional hot-pressed boards, PSP 3050 achieves its final properties through an advanced hot-air drying process followed by precision calendering, resulting in superior dimensional stability and uniform density distribution across all thicknesses . This unique manufacturing method ensures consistent quality while maintaining the exceptional purity levels required for high-voltage applications up to 35kV.
PSP 3050 is classified as Class A insulation material with a continuous operating temperature rating of 105°C, making it ideal for power and distribution transformers operating under normal service conditions.
PSP 3050 fully complies with international standards for electrical insulation materials, standard IEC 60641-3-1, IEC type B.2.1B
Material Composition
100% unbleached sulphate cellulose from long-fibred coniferous wood
Ultra-pure water in manufacturing process
No bonding agents or adhesives – pure cellulose structure
Natural colour – no dyes or artificial colourants
Performance Characteristics
1. High chemical purity: Prevents contamination of transformer oil and ensures long-term dielectric stability
2. Excellent dielectric strength: ≥12 kV/mm in air, ≥40 kV/mm in oil for reliable insulation performance
3. Superior mechanical strength: Minimum tensile strength 80-90 MPa (MD) for demanding winding and assembly processes
4. Good oil absorption:≥13% absorption rate ensures complete impregnation in oil-filled transformers
5. Excellent compatibility: Works with mineral oils, synthetic esters, and natural ester liquids
FAQ:
Q1: What is the temperature rating of PSP 3050?
A: PSP 3050 is rated as Class A insulation material with a continuous operating temperature of 105°C
Q2: Can PSP 3050 be used in capacitors?
A: Yes, PSP 3050 is suitable for capacitor applications due to its high chemical purity and dielectric propertie
Q3: What are the standard sheet sizes?
A: Standard sheet sizes are 1000 x 2000 mm and 2100 x 4200 mm. Other formats and individual solutions are available on request
Parameter
| Type | Transformer pressboard | |||||
| Thickness | 0.8-4.0mm | |||||
| Thermal Class | A Class 105℃ | |||||
| Sheet size | 1000X2000mm, 2100X4200mm | |||||
| For more information, please contact us: [email protected] | ||||||
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Quick Answers for You
Quick answers to your pressing questions.
Q: What thickness, width, length, and tolerance can you supply?
A: Chengrui Insulation can supply standard sizes and also customize dimensions according to customer drawings or application requirements. The tolerance depends on material type, thickness, and processing method. Before quotation, customers should confirm thickness, width, length, quantity, roll weight, or drawing dimensions.
Q: Can you process according to drawings, such as strips, punching, CNC machining, molded parts, and oil duct spacers?
A: Chengrui Insulation can provide custom processing according to drawings, not only raw insulation materials. Common processing includes strip cutting, punching, chamfering, slotting, CNC machining, and components etc.
Q: Is this material suitable for my transformer type, oil-immersed or dry-type?
A: Chengrui Insulation can offer insulation materials both for oil-immersed transformers and dry-type transformers. Common materials for oil-immersed transformers include electrical kraft paper, diamond dotted paper, crepe paper, insulation pressboard, pressboard strips, oil duct spacers, insulation cylinders, and laminated wood. They are widely used for winding insulation, interlayer insulation, end insulation, oil ducts, and support structures. For dry-type transformers requiring higher thermal performance, we normally recommend NMN, NHN, AMA, polyimide film, epoxy fiberglass sheets, etc
Q: Are you a trader or manufacturer?
A: Chengrui combines our own manufacturing capabilities (flexible laminates, insulation sleeving etc) with a qualified partner production network. This allows us to supply a broader range of electrical insulation materials while maintaining specification control, quality inspection and technical support.
Q: What technical documents can you provide?
A: Depending on the material, we can provide ISO, TDS, RoHS, REACH, SGS reports and relevant IEC or UL information for technical evaluation and supplier approval.
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