China U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines Supplier, Factory

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China U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines Supplier, Factory

Aerodynamic insulators are specially designed electrical insulators that are optimized to reduce flashover risk under wind load, wind noise, and wind and rain conditions while maintaining electrical insulation performance.

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Product Description

Product Overview

U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (5)

U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (4)

Model Specifications

Model: U70BLA
- U Refers To Disc Suspension Insulator
- B For Ball And Socket Type
- L Stands For Long Steel Foot
- A Stands For Aerodynamic Type
Type: Aerodynamic profile Toughened Suspension Type
Rated mechanical load: 70kn (about 7 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.
The product model is in accordance with GB/T 7253-2005 and JB/T9683-2012.
The connection structure is in accordance with GB/T4056-2008 (IEC60120:1984, MOD) and BS 3288 part III.
According to customer requirements, the locking pin can be either W-pin or R-pin.
If there is no special instruction, W-pin is used for U70~U120, others use R-pin.

U70BLD External Double-shed Type Glass Insulators IEC Standard for High Voltage Lines (7)

U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines (3)

Structure and Materials

Aerodynamic glass insulators, with their unique structures such as streamlined shape, large creepage distance, and optimized umbrella skirt design, combine high strength with excellent insulation performance. They are widely used in high-voltage to ultra-high-voltage transmission lines, especially in large-span sections crossing rivers and valleys, as well as in areas with pollution and strong winds, effectively reducing wind resistance, wind deflection accidents, and pollution flashover risks. At the same time, due to its high reliability and maintenance-free characteristics, it is also used in substations, electrified railways, and internal power supply systems of factories and enterprises. It is an important insulating component to ensure the safe and stable operation of modern power grids.

Key Parameters

High voltage Open profile type glass suspension insulator string
Domestic designation		U70BSA	U70BLA	U100BSA	U100BLA	U120BSA	U120BLA	U160BSA	U160BMA	U210AD	U240AD	U300AD
Mechanical failing load	kn	70	70	100	100	120	120	160	160	210	240	300
Nominal Diameter D	mm	380	380	380	380	380	380	420	420	420	420	420
Nominal Spacing P	mm	127	146	127	146	127	146	146	155	170	170	195
Creepage distance L	mm	365	365	365	365	365	365	380	380	380	380	465
Socket coupling	mm	16	16	16	16	16	16	20	20	20	20/24	28
Wet power frequency withstand voltage	kv	45	45	45	45	45	45	50	50	50	50	50
Dry lightning impulse withstand voltage	kv	90	90	90	90	90	90	95	95	95	95	95
Power frequency puncture voltage	kv	130	130	130	130	130	130	130	130	130	130	130
Radio interference voltage (10kV 1MHz)	μv	50	50	50	50	50	50	50	50	50	50	50
Corona visual test P/C	kv	18/22	18/22	18/22	18/22	18/22	18/22	18/22	18/22	18/22	18/22	18/22
Power frequency electric arc voltage	ka	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA	0.12S/20kA
Impulse puncture voltage	P.U	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8
Net weight per unit	kg	5.2	5.3	5.2	5.3	5.2	5.3	7.2	7.3	7.3	7.5	12

Frequently Asked Questions

Q1: What does the designation U70BLA stand for?

A: In the designation U70BLA, 'U' refers to Disc Suspension Insulator, 'B' represents the Ball and Socket type connection, 'L' stands for Long Steel Foot, and 'A' stands for the Aerodynamic profile design.

Q2: What is the rated mechanical load of U70BLA insulators?

A: The rated mechanical failing load is 70kN, which is equivalent to approximately 7 tons of tension capacity, making it suitable for medium to high voltage transmission lines.

Q3: Where are aerodynamic glass insulators typically used?

A: They are widely used in high-voltage to ultra-high-voltage transmission lines, particularly in large-span sections crossing rivers/valleys, areas with high wind levels, polluted regions, substations, and electrified railways.

Q4: What standard connections and product regulations do these insulators meet?

A: The product complies with GB/T 7253-2005 and JB/T9683-2012 standards. The connection structures are strictly aligned with GB/T4056-2008 (IEC60120:1984, MOD) and BS 3288 part III.

Q5: Can I choose between W-pin and R-pin locking configurations?

A: Yes. Depending on custom specifications, the locking pin can be either W-pin or R-pin. Typically, W-pins are standard for models U70 to U120, while other models utilize R-pins.

Q6: How do these aerodynamic structures perform in harsh weather environments?

A: Their streamlined profile, large creepage distance, and optimized umbrella skirt design lower wind resistance, decrease wind deflection issues, and greatly minimize the danger of pollution flashovers in dusty or coastal environments.