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U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (7).jpg
U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (8).jpg
U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (1).jpg
U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (6).jpg

U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines

Aerodynamic insulators are specially designed electrical insulators that are optimized to reduce flashover risk under wind load, wind noise, and wind and rain conditions while maintaining electrical insulation performance.

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    product details

    Product Overview

    U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (5)
    U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (4)
    ● Model: U70BLA
    • U Refers To Disc Suspension Insulator
    • B For Ball And Socket Type
    • L Stands For Long Steel Foot
    • A Stands For Aerodynamic Type
    ● Type: Aerodynamic profile Toughened Suspension Type
    ● Rated mechanical load: 70kn (about 7 tons)
    ● Purpose: Widely applicable as insulation support for medium and high voltage transmission lines and substation equipment, capable of stable operation under various climatic conditions.
    ● The product model is in accordance with GB/T 7253-2005 and JB/T9683-2012
    ● The connection structure is in accordance with GB/T4056-2008(IEC60120:1984,MOD) and BS 3288 part lll.
    ● According to customer requirements, the locking pin can be either W-pin or R-pin.
    ● If there is no special instruction, W-pin is used for U70~U120,Other uses R-pin.
    • U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines (7)
    • U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (3)

    Structure and materials

    Aerodynamic glass insulators, with their unique structures such as streamlined shape, large creepage distance, and optimized umbrella skirt design, combine high strength with excellent insulation performance. They are widely used in high-voltage to ultra-high-voltage transmission lines, especially in large-span sections crossing rivers and valleys, as well as in areas with pollution and strong winds, effectively reducing wind resistance, wind deflection accidents, and pollution flashover risks.At the same time, due to its high reliability and maintenace-free characteristics, it is also used in substations, electrified railways and internal power supply systems of factories and enterprises. It is an important insulating component to ensure the safe and stable operation of modern power grids.

    key parameters 

    High voltage Open profile type glass suspension insulator string

    Domestic designation

    U70BSA

    U70BLA

    U100BSA

    U100BLA

    U120BSA

    U120BLA

    U160BSA

    U160BMA

    U210AD

    U240AD

    U300AD

    Mechanical failing load

    kn

    70

    70

    100

    100

    120

    120

    160

    160

    210

    240

    300

    Nominal Diameter D

    mm

    380

    380

    380

    380

    380

    380

    420

    420

    420

    420

    420

    Nominal Spacing P

    mm

    127

    146

    127

    146

    127

    146

    146

    155

    170

    170

    195

    Creepage distance L

    mm

    365

    365

    365

    365

    365

    365

    380

    380

    380

    380

    465

    Socket coupling

    mm

    16

    16

    16

    16

    16

    16

    20

    20

    20

    20/24

    28

    Wet power frequency withstand voltage

    kv

    45

    45

    45

    45

    45

    45

    50

    50

    50

    50

    50

    Dry lightning impulse withstand voltage

    kv

    90

    90

    90

    90

    90

    90

    95

    95

    95

    95

    95

    Power frequency puncture voltage

    kv

    130

    130

    130

    130

    130

    130

    130

    130

    130

    130

    130

    Radio interference voltage(10kV 1MHz)

    μv

    50

    50

    50

    50

    50

    50

    50

    50

    50

    50

    50

    Corona visual test P/C

    kv

    18/22

    18/22

    18/22

    18/22

    18/22

    18/22

    18/22

    18/22

    18/22

    18/22

    18/22

    Power frequency electric arc voltage

    ka

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    0.12S/20kA

    Impulse puncture voltage

    P.U

    2.8

    2.8

    2.8

    2.8

    2.8

    2.8

    2.8

    2.8

    2.8

    2.8

    2.8

    Net weight per unit

    kg

    5.2

    5.3

    5.2

    5.3

    5.2

    5.3

    7.2

    7.3

    7.3

    7.5

    12

    Core Features

    Aerodynamic design:
    Streamlined umbrella skirt structure: Can reduce wind resistance, reduce the probability of wind deflection accident.
    Control sway: Through the concave and convex texture or diversion groove, to avoid vibration caused by eddy current shedding.
    Prevent rain flashover performance:
    Tilted umbrella skirt: The tilted design of the umbrella skirt accelerates the sliding of rainwater and reduces water accumulation.
    Umbrella spacing optimization: Block the continuous flow of rainwater, improve the insulation performance in humid environment
    Material technology:
    High strength ceramics (such as alumina) or composite silicone rubber are usually used, which combine lightweight and weather resistance.
    Advantages:
    Reduce wind load: Suitable for typhoon or windy areas (such as coastal and high-altitude transmission lines).
    Reduce corona and noise: Smooth surfaces suppress corona discharge, suitable for urban or residential areas.
    Anti pollution flash capability: Designed to be combined with anti fouling coatings for industrial pollution or salt spray environments.
    Typical applications:
    High voltage/ultra-high voltage transmission lines: Large-span sections crossing canyons and rivers.
    High speed railway overhead contact system: Reduce the impact of train wind on insulators.
    Offshore wind power transmission project: Resistant to strong winds and salt spray corrosion.
    Compared to traditional insulators

    Characteristic

    Aerodynamic Insulators

    Traditional Disc Suspension Insulators

    Drag coefficient

    Low (about 0.5-0.7)

    High (about 1.2-1.5)

    Wind and rain flashover voltage

    Increase by 20% -30%

    Easy to be affected by rain curtains

    Applicable wind speed

    Up to 40m/s or more

    Usually limited to speeds below 30m/s
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