U70BLA Aerodynamic Type Glass Insulators IEC Standard for High Voltage Lines

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.

Product Details

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: 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 lll.

● 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,Other uses R-pin.

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 maintenace-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

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