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Home > Products > Porcelain Insulator > Line Post Insulator > Porcelain Line Post Insulators 57-31
Porcelain Line Post Insulators 57-31
  • Porcelain Line Post Insulators 57-31

Porcelain Line Post Insulators 57-31

    Payment Type: L/C,T/T
    Incoterm: FOB,CFR,CIF
    Min. Order: 1000 Piece/Pieces
    Delivery Time: 30 Days

Basic Info

Model No.: 57-31

Application: High-voltage

Material: Porcelain

Structure: Post Insulator

Usage: High Voltage Power Transmission

Connection Method: Trough Type

Certification: SGS, ISO9001

Place Of Origin: Fuzhou,China

HS Code: 85462090

Color: Brown , Light Grey

Size of Bearing Capacity: 70KN

Additional Info

Packaging: Carton, Wooden case, Sack

Transportation: Ocean,Land


Product Description

Porcelain Line Post Insulator 57-31

Post Insulator Specification

Post Porcelain Insulator high voltage in transmission lines have good chemical and thermal stability, hardly deteriorates, and line post insulators ceramic have good electrical and mechanical properties. Line post insulator high voltage comply with ANSI.

Type 57-31
Creepage Distance,mm 356
Dry Arcing Distance,mm 165
Cantilever Strength,KN 12.5
Low Frequency Dry Flashover Voltage,KV 70
Low Frequency Wet Flashover Voltage/,KV 50
Critical Impulse Flashover Voltage, Pos,KV 120
Critical Impulse Flashover Voltage, Neg,KV 155
Test Voltage to Ground,KV 15
Maximum RIV at 1000KHZ,μv 100
Net Weight,kg 9.5
Applicable standard ANSI
line post insulator 69kv

Our Services

1. Small Orders Accepted
2. Fast producing time, Prompt Delivery
3. International Approvals
4. Reply promptly in 24 hours
5. Best Price


1. Q: How about payment terms?
A: 30% TT deposit + 70% TT before shipment,50% TT deposit + 50% LC balance, Flexible payment can be negotiated.
2. Q: Do you have some videos where we can see the line producing?
A: Yes, we can provide some videos for reference.
3. Q: Are you a Manufacture Factory?
A: Yes. We are the direct manufacture factory, and our factory has specialized in porcelain insulator,Composite Insulator,Glass Insulator,arrester, Cut Out Fuse and Power Fitting ,etc.

4. Q: How long is producing time ?

A: Normally it will take about 30 days for production.

5. Q: What is the standard of package ?
A: For small capacity, we use carton, but for big capacity, we will use strong wooden case for protection or double inner packs in a master carton.
6. Q: How do you make sure your good quality ?

A: We use the best raw material , and every single product will go through a series of strict test.



We warmly welcome friends both domestic and abroad to visit our company, if you have any questions, please contact with us directly.

Looking for ideal Line Post Insulator 33kv Manufacturer & supplier ? We have a wide selection at great prices to help you get creative. All the Post Insulator Specification are quality guaranteed. We are China Origin Factory of Line Post Insulator 69kv. If you have any question, please feel free to contact us.

Product Categories : Porcelain Insulator > Line Post Insulator

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