70kn High Voltage Anti-Pollution Toughened Suspension Glass Insulator U70BLP
Product Overview
● Model: U70BLP
• U Refers To Disc Suspension Insulator
• B For Ball And Socket Type
• L Stands For Long Steel Foot
• P Stands For Anti-fog Type
● Type: Anti-Pollution Or Anti-Fog Profile Toughened Suspension Type
● Rated mechanical load: 70kn (about 7 tons)
● Purpose: It is mainly used for high voltage/ultra-high voltage transmission lines (such as 110KV, 220kV, 500kV, etc.), especially for harsh environments such as high pollution, high humidity, salt fog, industrial dust, etc., to provide electrical insulation and mechanical support.
● The product model is in accordance with GB/T 7253-2005 and JB/T9683-2012(EC60305:1995MOD)
● 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.
● According to customer requirements, the locking pin can be either W-pin or R-pin.
Structure and materials
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Glass umbrella tray
High strength toughened glass is adopted, and the mechanical properties and cold and heat shock resistance are enhanced by heat treatment process.It has smooth surface, strong hydrophobicity, dirt is not easy to adhere, and excellent anti pollution performance.Zero value self explosion characteristic: if the glass insulator loses its insulation performance due to fault, the umbrella disc will burst automatically, so that the operation and maintenance personnel can quickly identify the fault point. -
Metal accessories
Cap& pin: made of hot-dip galvanized steel or aluminum, corrosion-resistant, and closely connected with the glass umbrella tray through cement adhesive.Locking pin: standardized design to ensure reliable connection of insulator string. -
Umbrella skirt design
The large climbing distance anti- fog umbrella skirt structure is adopted, with large umbrella spacing and deep umbrella edge, which can effectively increase the creepage distance (usually ≥ 450mm) and suppress arc and pollution flashover.The umbrella shape is optimized to prevent rainwater from continuously forming a line and improve the wet flashover voltage.
key parameters
|
Domestic designation |
U70BLP |
U70BLP1 |
|
|
QOCI Type |
UG70B146/450H |
UG70B146/550H |
|
|
Mechanical failing load |
kN |
70 |
70 |
|
Nominal Diameter D |
mm |
280 |
320 |
|
Nominal Spacing P |
mm |
146 |
146 |
|
Creepage distance L |
mm |
450 |
550 |
|
Socket coupling |
mm |
16 |
16 |
|
Wet power frequency withstand voltage |
kv |
50 |
55 |
|
Dry lightning impulse withstand voltage |
kv |
125 |
140 |
|
Power frequency puncture voltage |
kv |
130 |
130 |
|
Radio interference voltage(10kV 1MHz) |
μv |
50 |
50 |
|
Corona visual test P/C |
kv |
18/22 |
18/22 |
|
Power frequency electric arc voltage |
ka |
0.12S/20kA |
0.12S/20kA |
|
Impulse puncture voltage |
P.U |
2.8 |
2.8 |
|
Net weight per unit |
kg |
5.8 |
9.2 |
Characteristics of U70BP Anti-Pollution Insulators
The U70BP anti-pollution insulator is a commonly used suspension insulator in power systems, primarily deployed in high-voltage or ultra-high-voltage transmission lines, especially in areas with high pollution levels (e.g., industrial zones, coastal regions, or salt-alkali environments). Its key features include the following:
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-
1. Excellent Pollution ResistanceSpecial Shed Design: Features include large-diameter, deep-ribbed sheds (such as open or streamlined profiles) to increase the creepage distance and prevent the continuous accumulation of pollution, thereby enhancing anti-flashover performance.Material & Coating: Typically composed of high-strength porcelain or tempered glass, these materials are coated with silicone rubber or RTV (Room Temperature Vulcanized) to provide strong hydrophobic properties, thereby suppressing conductive paths in polluted and humid conditions.
2. Electrical Characteristics
Rated Voltage: Suitable for 110kV and above (depending on the number of units in a string).
Power Frequency Withstand Voltage: Typically ≥70kV (varies by standard).
Lightning Impulse Withstand Voltage: ≥125kV .
Creepage Distance: ≥450mm.
3. Mechanical Properties
Mechanical Load Rating: The "70" in the model denotes a rated mechanical tensile load of 70kN (7 tons).
Structural Strength: Use high-strength cement bonding and galvanized steel fittings for corrosion resistance and fatigue endurance.
4. Environmental Adaptability
Weather Resistance: Performs well in high humidity, salt fog, acid rain, and other harsh conditions.
Temperature Range: Stable performance from -40℃ to +40℃.
5. Standards & Certifications
Comply with IEC 60383, GB/T 1001, and other international/national standards.
Validate through pollution tests (e.g., solid-layer method, salt fog test) for pollution class certification.
6. Applications
Used in suspension or tension strings for transmission lines, especially in:
1.Industrial pollution zones (e.g., near power plants, chemical factories).
2.Coastal or high-salinity areas
3.Fog-prone or humid climate
Comparison with Other Models
U70B: Standard type, shorter creepage distance, suitable for clean areas.
U70BP: Anti-pollution type, extended creepage distance, optimized shed design.
U120BP: Higher mechanical load (120kN) anti-pollution variant.
Maintenance Notes
Regularly inspect for coating degradation or damage.
In heavily polluted areas, live-line washing or reapplication of anti-flashover coatings may be required.
For detailed specifications, refer to the manufacturer’s technical manual or standards (e.g., GB/T 7253).
Contact Us
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Due to the time difference, we may not be able to reply to you immediately. We will reply to your email as soon as we start working.