What Is Pre-Compressed Press Board (PCB) Insulation in a Transformer?
Meaning, Uses, Properties & Importance
Power aur distribution transformers ke andar transformer insulation system sabse important role play karta hai. Agar insulation weak ho jaye, to transformer ki performance aur life dono par direct effect padta hai. Isi insulation system ka ek bahut important material hai Pre-Compressed Press Board (PCB).
Pre-compressed press Board in transformer, mainly oil-filled transformers me use hota hai, jahan high voltage insulation ke saath-saath strong mechanical strength bhi required hoti hai. Is article me hum samjhenge ki PCB insulation material kya hota hai, PCB ka use kahan hota hai, aur power transformers me PCB itna important kyun hai.
What Is Pre-Compressed Press Board (PCB)?
Pre-Compressed Press Board (PCB) ek high-density transformer insulation material hota hai jo pure cellulose wood pulp se banaya jata hai. Manufacturing ke dauran is press board ko high pressure aur controlled temperature ke under compress kiya jata hai, jisse iski strength aur stability badh jati hai.
Is pre-compression process ki wajah se PCB:
- Zyada strong hota hai
- Apni shape aur thickness maintain karta hai
- High voltage electrical stress aur mechanical forces handle karta hai
Jab PCB transformer mineral oil ke saath oil-impregnated hota hai, to iski dielectric strength aur insulation performance aur bhi better ho jati hai.
Why Is Pre-Compressed Press Board Used in Transformers?
Transformers continuously high voltage, high temperature aur short-circuit forces ke under operate karte hain. Normal insulation materials time ke saath deform ho sakte hain ya weak ho jate hain.
Pre-compressed press board insulation uses ki jati hai kyunki yeh:
- High electrical insulation provides karta hai
- Mechanical pressure ke under deform nahi hota
- Transformer oil ke saath fully compatible hota hai
- Long service life aur reliability deta hai
Isi liye PCB power transformer insulation system ka ek critical component mana jata hai.
Manufacturing Process of Pre-Compressed Press Board
PCB insulation material banane ke main steps hote hain:
- High-quality cellulose pulp ka selection
- Press board sheet formation
- High-pressure me pre-compression
- Controlled drying for moisture removal
- Required size aur thickness me cutting
Pre-compression process hi PCB ko normal press board insulation se zyada strong aur dimensionally stable banata hai.
Properties of Pre-Compressed Press Board
Electrical Properties
- High dielectric strength
- Excellent insulation resistance
- Medium aur high voltage transformers ke liye suitable
Mechanical Properties
- High compressive strength
- Strong aur rigid structure
- Load aur short-circuit forces ke under shape maintain karta hai
Thermal Properties
- Transformer operating temperature easily withstands karta hai
- Long-term stable insulation performance deta hai
Oil Compatibility
- Transformer mineral oil ke saath fully compatible
- Oil absorption se insulation aur zyada effective ho jati hai
Types & Forms of Pre-Compressed Press Board
Pre-compressed press board different transformer applications ke liye alag-alag forms me available hota hai:
- PCB Sheets – insulation barriers aur walls ke liye
- PCB Cylinders – winding aur core insulation ke liye
- PCB Rings & Segments – end insulation ke liye
- Machined PCB Parts – spacers, blocks aur mechanical supports
Applications of Pre-Compressed Press Board
PCB insulation material ka wide use hota hai:
- Power transformers
- Distribution transformers
- Reactors
- Tap changers
- Transformer bushings
Transformer ke andar PCB ka use hota hai:
- Winding insulation
- Inter-layer insulation
- End rings aur insulation barriers
- Core insulation
- Mechanical support structures
Advantages of Pre-Compressed Press Board
- High electrical insulation strength
- Excellent mechanical stability
- Long service life
- Oil impregnation ke baad better dielectric performance
- Eco-friendly (cellulose-based insulation material)
- Easily machined into required shapes
Limitations of Pre-Compressed Press Board
- Oil impregnation se pehle moisture ke liye sensitive hota hai
- Dry aur controlled storage conditions required hoti hain
- Mainly oil-filled transformers ke liye suitable hota hai
Importance of PCB in Transformer Insulation System
Pre-Compressed Press Board in transformer insulation system me:
- Proper electrical clearances maintain karta hai
- Short-circuit mechanical forces ko safely handle karta hai
- Transformer reliability aur operational life increase karta hai
High-voltage transformers me PCB insulation material ke bina safe aur long-term insulation system achieve karna possible nahi hota.
Difference Between Press Board and Pre-Compressed Press Board
| Feature | Press Board | Pre-Compressed Press Board |
| Density | Medium | High |
| Mechanical Strength | Normal | Very High |
| Dimensional Stability | Limited | Excellent |
| Voltage Application | Low voltage | Medium & High voltage |
FAQs – Pre-Compressed Press Board (PCB)