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Home > Double -Shed Type > High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
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High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory
High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory

High-Quality 120kN U120BD Double-Shed Type Glass Insulators IEC Standard for High Voltage Lines Suppliers, Factory

120kN IEC Standard Electrical Glass Insulator U120BLD (UG120B/146/450D) Double-Shed Type Glass Insulators for High Voltage Lines

U120 High Voltage Cap and Pin Type Anti-Fog Glass Insulator Isolator Toughened Double Shed Glass Electric Insulator

Two-Winged Glass Suspension Insulators PSD-120 B Type

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Product Description

Product Information

U120BLD Toughened Glass Insulator
  • Model: U120BLD
  • U: Refers To Disc Suspension Insulator
  • 120: Indicates a rated Mechanical failing load of 120kN
  • B: For Ball And Socket Type
  • L: For Long steel feet
  • D: For Double Shed profile glass Insulator
  • 280: Diameter of the insulator disc is 280mm.
  • 146: Height of the insulator structure is 146mm.
  • 450: Creepage distance of the insulator is 450mm.

Type: External shed profile Toughened Suspension Type

Rated mechanical load: 120kn (approximately 12 tons)

Purpose: Primarily used in high-voltage transmission lines in areas with heavy pollution or humid, rainy conditions. Their double-shed design effectively enhances anti-pollution flashover performance, ensuring stable operation of the power system.

  • Compliance: IEC60383-1:1993, MOD / GB/T1001.1
  • Connection Structure: GB/T4056-2008 (IEC60120:1984, MOD) and BS 3288 part III.
  • Locking Device: Available in W-pin or R-pin (Default: R pin for U120B).

Technical Drawing

U70BLD Technical Drawing

Technical Parameters

Parameter Item Unit Specification (U120BLD)
Mechanical failing load kN 120
Nominal Diameter D mm 280
Nominal Spacing P mm 146
Creepage distance L mm 450
Socket coupling mm 16
Wet power frequency withstand voltage kv 45
Dry lightning impulse withstand voltage kv 120
Power frequency puncture voltage kv 110
Radio interference voltage (10kV 1MHz) μv 50
Corona visual test P/C kv 18/22
Power frequency electric arc voltage ka 0.12s/20ka
Impulse puncture voltage P.U 2.8
Net weight per unit kg 5.4

Suspension Insulator Components

Insulator Component Diagram

Suspension insulators consist of the following elements:

  • Dielectric: Made of toughened glass with properties optimized for specific environmental conditions.
  • Cap: Hot-dip galvanized nodular or ductile malleable cast iron.
  • Pin: Hot-dip galvanized forged steel.
  • Assembly: Cap and pin are secured to the glass using high-strength aluminous cement to withstand thermomechanical stress.
  • Locking Device: Stainless steel or phosphor bronze split pin to secure unit coupling.
  • Optional Protection: Zinc sleeve (sacrificial anode) on pins for heavy pollution areas.

Insulator Shell Cross-Section

Under long-term electrical stress, contaminants can trigger local arcs, leading to surface carbonization (electrocorrosion). The double-shed design provides sufficient creepage distance to disperse electric field strength, reducing discharge risks and extending service life.

Cross-section Details

Product Display

Glass Insulator Display 1
Glass Insulator Display 2

Frequently Asked Questions

What does the "D" in U120BLD stand for?
The "D" signifies a Double Shed profile. This design is specifically engineered to provide superior performance in polluted, humid, or rainy environments compared to standard profiles.
What is the mechanical strength of the U120BLD insulator?
The U120BLD has a rated mechanical failing load of 120kN, which is approximately equivalent to 12 tons of tension strength.
Which international standards do these glass insulators follow?
These products are manufactured in accordance with IEC60383-1:1993 for characteristics and IEC60120 / GB/T4056-2008 for connection structures and dimensions.
What materials are used for the metal components?
The cap is made of hot-dip galvanized nodular or ductile cast iron, and the pin is made of hot-dip galvanized forged steel, ensuring high corrosion resistance.
Why is aluminous cement used in the assembly?
Aluminous cement provides excellent mechanical properties and thermal stability, allowing the insulator to withstand significant thermomechanical efforts during its service life on high-voltage lines.
Is an anti-corrosion zinc sleeve available?
Yes, upon request, a zinc sleeve (sacrificial anode) can be added to the pin. This is highly recommended for insulators installed in coastal or heavily industrial polluted areas.

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