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Home > Standard Type > High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
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High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers
High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers

High-Quality U70BL/255/146/320 IEC Standard profile 70kn suspension Tempered glass Insulator CTV254 Manufacturers, Suppliers

High Quality Disc Tempered Glass Insulator U70b High-Voltage Line Suspension Type，These are the most common and most frequently used insulators for low pollution lines, where they perform well due to their small, well-spaced ribs and a creepage distance which exceeds the requirements of the ANSI C29.2 standards and CSA C411 standards.

 

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Product Description

Product Overview Video

Product Information

U70BL Insulator
Model: U70BL - U Refers To Disc Suspension Insulator
70: Indicates a rated Mechanical failing load of 70kN
B: For Ball And Socket Type connection
L: Stands For Long Steel Foot structure
  • Height: 146mm structure height (Alternative 127mm available)
  • Diameter: 255mm disc diameter (Options up to 420mm available)
  • Creepage Distance: 320mm (Options up to 550mm available)
  • Type: Standard profile Toughened Suspension Type
  • Application: Medium and high voltage transmission lines and substation equipment
  • Standards: IEC60383-1:1993, GB/T1001.1, BS 3288 part III

Technical Drawing

Technical Drawing

Technical Parameters

Parameter Unit U70BSA U70BLA
Mechanical failing loadkn7070
Nominal Diameter Dmm380380
Nominal Spacing Pmm127146
Creepage distance Lmm365365
Socket couplingmm1616
Wet power frequency withstand voltagekv4545
Dry lightning impulse withstand voltagekv9090
Power frequency puncture voltagekv130130
Net weight per unitkg5.25.3

Suspension Insulator Components

Components Diagram
  • Dielectric: Toughened glass with specialized environmental properties.
  • Cap: Hot-dip galvanized nodular or ductile malleable cast iron.
  • Pin: Hot-dip galvanized forged steel.
  • Assembly: High-strength aluminous cement for thermomechanical stability.
  • Locking Device: Stainless steel or phosphor bronze split pin (W-pin or R-pin).

Glass Insulator Shell Cross-Section

Under long-term electrical stress, contaminants can trigger local arcs, leading to insulator surface carbonization (electrocorrosion). Adequate creepage distance disperses the electric field strength, reducing local discharge risk and extending product life.

Cross Section Analysis

Detailed Product Gallery

Glass Shell Detail
Glass Insulator View
Insulator String
Assembly Detail

Standard Packaging

Packaging Logistics

Frequently Asked Questions (FAQ)

1. What does the "70" in U70BL represent?
The number 70 indicates the rated mechanical failing load of 70kN, which is approximately equivalent to 7 tons of force.
2. Which international standards do these insulators comply with?
Our insulators are manufactured in accordance with IEC60383-1, GB/T1001.1, and connection structures follow BS 3288 part III and IEC60120.
3. What is the difference between W-pin and R-pin locking devices?
These refer to the shape of the stainless steel or phosphor bronze locking pins. Unless otherwise specified, the U70BL typically utilizes a W-pin for secure coupling.
4. Why is creepage distance important for glass insulators?
Adequate creepage distance is critical for dispersing electric field strength. This helps prevent local arcs and surface carbonization (electrocorrosion) caused by long-term environmental contaminants.
5. Can these insulators be used in highly polluted environments?
Yes. For heavy pollution areas, we recommend using pins protected with an anti-corrosion zinc sleeve (sacrificial anode) to ensure long-term stability and performance.
6. What materials are used in the main components?
The dielectric is made of toughened glass, the cap is hot-dip galvanized cast iron, and the pin is hot-dip galvanized forged steel, all bonded with high-grade aluminous cement.

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