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Home > Double -Shed Type > Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
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Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers
Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers

Wholesale U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines Manufacturer, Manufacturers

The double-shed insulator features a two-layer shed design, combining a long creepage distance with excellent self-cleaning performance, making it suitable for heavily polluted environments.

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Product Description

Product Overview
U70BLD Glass Insulator View 1
U70BLD Glass Insulator View 2
U70BLD Glass Insulator View 3
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Model: U70BLD (U: Disc Suspension, B: Ball and Socket, L: Long Steel Foot, D: Double-shed Type)
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Type: External Double-shed profile Toughened Suspension Type
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Rated Mechanical Load: 70kN (approximately 7 tons)
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Purpose: Insulation support for medium and high voltage transmission lines and substation equipment across various climates.
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Standards: Complies with GB/T 7253-2005, JB/T9683-2012, IEC60120:1984, and BS 3288 part III.
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Hardware: Locking pins available in W-pin or R-pin (W-pin used for U70~U120 by default).
Key Parameters
Description Unit Specification (U70BLD)
IEC Designation-U70BLD
Mechanical Failing LoadkN70
Nominal Diameter (D)mm280
Nominal Spacing (P)mm146
Creepage Distance (L)mm450
Socket Couplingmm16
Wet Power Frequency Withstand VoltagekV45
Dry Lightning Impulse Withstand VoltagekV120
Power Frequency Puncture VoltagekV110
Radio Interference Voltage (10kV 1MHz)μV50
Corona Visual Test P/CkV18/22
Power Frequency Electric Arc VoltagekA0.12s/20ka
Impulse Puncture VoltageP.U2.8
Net Weight Per Unitkg5.4
Structure and Materials
Structure Detail 1
Structure Detail 2
High Mechanical Strength

Features high-strength iron caps and steel bases combined with toughened glass, capable of reaching failure loads up to 160KN (depending on model).

Excellent Insulation

Tempered glass provides superior electrical isolation, with lightning impulse withstand voltages up to 140KV.

Corrosion Resistance

Anti-corrosion treated iron caps and chemically stable glass resist harsh environmental erosion effectively.

Self-Cleaning Performance

The smooth glass surface prevents dirt accumulation and is naturally cleaned by rain, reducing maintenance costs.

Shape & Dimensions:

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Height: Available in 146mm, 155mm, and 170mm specifications to suit specific voltage levels.
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Diameter: Large umbrella skirt design increases creepage distance, reducing flashover risks in polluted environments.
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Connection: Conforms to ISO cylindrical head structures for high interchangeability and easy installation.
Frequently Asked Questions
What does the U70BLD model designation stand for?
U represents a Disc Suspension Insulator; B indicates a Ball and Socket type connection; L stands for a Long Steel Foot; and D denotes the Double-shed profile design.
What are the mechanical load capacities of these insulators?
The U70BLD is rated for a mechanical load of 70kN, while other variations like the U160BL can handle up to 160kN, making them suitable for heavy-duty high voltage lines.
How does the double-shed design improve performance?
The double-shed profile increases the creepage distance (450mm for U70BLD), which significantly improves insulation performance and prevents flashovers in dirty or humid environments.
What standards do these toughened glass insulators follow?
Our insulators are manufactured in strict accordance with international standards including IEC60120, GB/T 7253, and BS 3288, ensuring global compatibility and reliability.
Is maintenance difficult for these insulators?
No, the tempered glass has an excellent self-cleaning property. Its smooth surface makes it difficult for pollutants to stick, and most dust is washed away naturally by rainwater.

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