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Home > Standard Type > China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
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China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories
China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories

China 120kN U120BL High Voltage Cap and Pin Type Toughened Disc Suspension Glass Electric Insulator Supplier, Factories

The U120B glass insulator offers high strength, corrosion resistance, and a long service life. With stable mechanical performance, it can withstand an electromechanical load of 120kN, making it suitable for high-voltage transmission lines. Its glass material enables self-shattering upon failure, simplifying inspection, while its smooth surface resists contamination, ensuring safe and reliable power system operation.

QOCI Electric's glass insulator products are of exceptional quality, manufactured using high-purity raw materials and advanced production techniques. They boast outstanding mechanical strength, weather resistance, and electrical performance. Rigorously tested, these insulators ensure superior anti-aging properties, excellent pollution flashover resistance, and long-term operational stability. Suitable for harsh environments, they provide reliable protection for safe and efficient power system operation.

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Product Description

Product Information

U120BL Disc Suspension Insulator

Model: U120BL

  • U: Refers To Disc Suspension Insulator
  • 120: Rated Mechanical failing load of 120kN
  • B: Ball And Socket Type
  • L: Stands For Long Steel Foot

Key Dimensions:

  • 146mm: Structural height (127mm also available)
  • 255mm: Disc diameter (Options up to 420mm)
  • 320mm: Creepage distance (Options up to 550mm)

Standard Specifications:

Type: Standard profile Toughened Suspension Type. Rated mechanical load: 120kn (approx. 12 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.

  • Compliant with IEC60383-1:1993 / GB/T1001.1
  • Connection structure per GB/T4056-2008 (IEC60120:1984) and BS 3288 part lll.
  • Locking pin: W-pin (Standard for U120BL) or R-pin available upon request.

Technical Drawing

U120BL Technical Drawing

Technical Parameters

IEC Designation Unit U120BS/127 U120BL/146
Mechanical failing loadkN120120
Diameter Dmm255255
Height Hmm127146
Creepage distance Lmm320320
Socket couplingmm1616
Wet power frequency withstand voltagekV4040
Dry lightning impulse withstand voltagekV100100
Power frequency puncture voltagekV130130
Radio interference voltage (10kV 1MHz)μV5050
Corona visual testkV18/2218/22
Power frequency electric arc voltagekA0.12s/20Ka0.12s/20Ka
Impulse puncture voltageP.U2.82.8
Net weight per unitkg44

Components & Construction

Suspension Glass Insulator Components

Structural Elements:

  • Dielectric: Toughened glass with specialized properties for harsh environments.
  • 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.
  • Locking Device: Stainless steel or phosphor bronze split pin (W or R type).
  • Protection: Optional anti-corrosion zinc sleeve (sacrificial anode) for heavy pollution areas.

Performance & Design

Under long-term electrical stress, contaminants can trigger local arcs, leading to insulator surface carbonization (electrocorrosion). Our design provides sufficient creepage distance to disperse electric field strength, reducing the risk of local discharge and extending service life.

Glass insulator shell Cross-section

Detailed Product Photos

Product Detail View 1
Product Detail View 2

Frequently Asked Questions

1. What does the "U120BL" model designation indicate?
"U" refers to a Disc Suspension Insulator, "120" indicates a rated mechanical failing load of 120kN, "B" signifies a Ball and Socket connection type, and "L" stands for the Long Steel Foot configuration.
2. Which international standards do these insulators follow?
The products are manufactured in accordance with IEC60383-1:1993, GB/T1001.1, and the connection structures comply with GB/T4056-2008 (IEC60120:1984) and BS 3288 part III.
3. What is the difference between U120BS and U120BL?
The primary difference is the structural height. The U120BS typically has a height of 127mm, while the U120BL has a height of 146mm. Both maintain a mechanical failing load of 120kN.
4. What type of locking pins are used for the coupling?
The insulators can be equipped with either W-pins or R-pins based on customer requirements. Unless specified otherwise, W-pins are the standard for the U120BL model.
5. Are these insulators suitable for high-pollution environments?
Yes. For heavily polluted areas, we recommend adding an anti-corrosion zinc sleeve (sacrificial anode) to the pins to enhance durability and prevent corrosion.
6. What material is the dielectric made of?
The dielectric is made of high-quality toughened glass, chosen for its excellent electrical properties and mechanical strength across various climatic conditions.

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