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Home > Standard Type > China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
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China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory
China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory

China 70kn High Voltage Glass Insulator CTV 254 Isolator En Verre U70BL Supplier, Factory

CTV 254 isolateur en verre is used in high-voltage power transmission systems ranging from 10 kV to 330 kV. It has a diameter of 254 mm, a creepage distance of 320 mm, and can withstand a minimum mechanical failing load of 70 kN.

Highly popular in the Algerian market, the CTV 254 glass insulator offers long-term reliability. Even after 30 years of operation, it maintains excellent mechanical and electrical properties.

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Product Description

Product Overview

Technical Drawing
Exploded View
Model: U70BL
  • ●U Refers To Disc Suspension Insulator
  • ●B For Ball And Socket Type
  • ●L Stands For Long Steel Foot
  • ●146: Insulator structure height (146mm)
  • ●255: Insulator disc diameter (255mm). Other options: 280mm, 300mm, 320mm, 380mm, 420mm.
  • ●320: Creepage distance (320mm). Other options: 400mm, 450mm, 550mm.

Type: Standard profile Toughened Suspension Type
Rated mechanical load: 70kn (approx. 7 tons)
Purpose: Widely applicable as insulation support for medium and high voltage transmission lines and substation equipment, stable under various climatic conditions.

• Product model complies with GB/T 7253-2005 and JB/T9683-2012 (IEC60305:1995MOD).
• Connection structure complies with GB/T4056-2008 (IEC60120:1984,MOD) and BS 3288 part lll.
• Locking pin available in W-pin or R-pin (W-pin is standard for U70BL).

Key Parameters

Parameter Unit U70BL/146 U70BS/127
Diameter Dmm255255
Height Hmm146127
Creepage distance Lmm320320
Socket couplingmm1616
Mechanical failing loadkn7070
Mechanical routine testkn3535
Wet power frequency withstand voltagekv4040
Dry lightning impulse withstand voltagekv100100
Impulse puncture voltageP.U2.82.8
Power frequency puncture voltagekv130130
Radio influence voltageμv5050
Corona visual testkv18/2218/22
Power frequency electric arc voltageka0.12s/20kA0.12s/20kA
Net weight per unitkg3.63.5

Structure and Materials

Structure and Materials
Glass Umbrella Tray:
• High strength tempered glass via heat treatment.
• Smooth surface, strong hydrophobicity, excellent anti-pollution.
• Zero value self-explosion: Burst automatically if insulation fails, allowing easy identification.
Metal Accessories:
• Cap & foot: Hot-dip galvanized steel or aluminum, corrosion-resistant.
• Locking pin: Standardized design for reliable connection.
Umbrella Skirt Design:
• Inclined design for rainwater shed and self-cleaning.
• Multi-layer spacing increases creepage distance and prevents flashover or rainwater bridging.

Packaging Method

• Insulators are arranged in strings (3 or 5 units) and fixed in wooden boxes.
• Boxes are stacked on pallets and secured with plastic strapping.
• All wooden materials undergo high-temperature fumigation treatment.

Packaging 1
Packaging 2
Packaging 3
Packaging 4

Bamboo Strip Packaging

Bamboo Packaging 1
Bamboo Packaging 2
Bamboo Packaging 3
Bamboo Packaging 4

Frequently Asked Questions

Q1: What does the "U70BL" model designation stand for? A: "U" indicates a disc suspension insulator, "70" represents the 70kN rated mechanical load, "B" signifies the ball and socket connection type, and "L" stands for the long steel foot design.
Q2: What is the "zero-value self-explosion" feature? A: This is a unique safety characteristic of toughened glass insulators. If the unit fails or loses insulation performance, the glass umbrella disc will automatically burst. This allows maintenance teams to quickly visually identify the fault point without complex testing.
Q3: Which international standards do these insulators meet? A: Our products are manufactured in accordance with GB/T 7253, JB/T9683 (equivalent to IEC60305:1995), and the connection structures meet IEC60120 and BS 3288 part III standards.
Q4: How does the umbrella skirt design improve performance? A: The inclined skirt facilitates rainwater runoff and self-cleaning of dirt. The multi-layer design increases creepage distance, which effectively prevents flashovers even in polluted or wet environments.
Q5: Are the wooden packaging materials safe for international shipping? A: Yes, all wooden strips used in our boxes and pallets undergo high-temperature fumigation treatment to meet international phytosanitary requirements for cross-border transportation.
Q6: What types of locking pins can be used with the insulator string? A: Depending on customer requirements, we can provide either W-pin or R-pin locking mechanisms. For the U70BL model, the W-pin is used as the standard configuration unless otherwise specified.

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