Toughened Glass insulator V-string
Toughened Glass insulator V-string

Toughened Glass insulator V-string

Toughened Glass insulator V-strings are widely used in high-voltage and extra-high-voltage transmission lines to increase mechanical stability, reduce conductor swing, and enhance line reliability during heavy wind, ice, and storm conditions. By connecting two toughened glass insulator strings in a V-shaped configuration, utilities achieve greater load distribution, minimized galloping, and improved insulation performance. A V-string consists of two glass disc insulator strings arranged in a V shape to support high mechanical loads and minimize conductor swing.
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Tension insulators U120

basic type figure no. minimum mechanical failing load(kn) nominal diameter d(mm) nominal spacing p(mm) nominal creepage distance (mm) standard coupling wet power frequency withstand voltage (kv) dry lightning impulse withstand voltage (kv) power frequency puncture voltage (kv) radio interference voltage (μ v) 10kv 1mhz corona visual test p/c kv power frequency electric arc voltage impulse puncture voltage (p.u) net weight (kg)

u40b

1-3 40 178 110 190 11 25 50 90 50 18/22 0.12s/20ka 2.8 2.1
u70bs 1-3 70 255 127 320 16 40 100 130 50 18/22 0.12s/20ka 2.8 3.5
u70bl 1-3 70 255 146 320 16 40 100 130 50 18/22 0.12s/20ka 2.8 3.6
u100bs 1-3 100 255 146 320 16 40 100 130 50 18/22 0.12s/20ka 2.8 4
u120bp 1-3 120 255 146 400 16 40 100 130 50 18/22 0.12s/20ka 2.8 4
u160bs 1-3 160 280 146 400 20 45 110 130 50 18/22 0.12s/20ka 2.8 6.5
u160bm 1-3 160 280 155 400 20 45 110 130 50 18/22 0.12s/20ka 2.8 6.6
u160bl 1-3 160 280 170 400 20 45 110 130 50 18/22 0.12s/20ka 2.8 6.7
u210b 1-3 210 280 170 400 20 45 110 130 50 18/22 0.12s/20ka 2.8 7.2
u240b 1-3 240 280 170 400 20/24 45 110 130 50 18/22 0.12s/20ka 2.8 7.2
u300b 1-3 300 320 195 485 24 50 130 130 50 18/22 0.12s/20ka 2.8 10.6
u420b 1-3 420 360 205 550 28 80 140 140 50 18/22 0.12s/20ka 2.8 16
u550b 1-3 550 380 240 600 32 55 140 140 50 18/22 0.12s/20ka 2.8 21.5

CTV254

(PS70E)

1-3
 70
 255
 127
 320
 16
 40
 100
 130
 130
 18/22
 0.12s/20ka
 2.8
 3.5
CTV175
 1-3
 40
 178 110 190 11 25 50 90 50 18/22 0.12s/s20ka 2.8 2.1

note:
1. the product model is in accordance with gb/t 7253-2005 and jb/t 9683-2012 (iec60305:1995, mod). the 420kn strength grade product contains 400kn strength grade, and the 550kn strength grade product contains 530kn strength grade.

2. the connection structure is in accordance with gb/t 4056-2008 (iec60120: 1984, mod) and bs 3288 part

3. according to the customer's request, the locking pin can be w-pin or r-pin. unless otherwise specified, u70~u120 adopts w pin, and other uses r pin.

4. black marks are hot sellers-your best Glass insulators choice for overhead power lines

What Is a Toughened Glass Insulator V-String?

A V-string consists of two glass disc insulator strings arranged in a V shape to support high mechanical loads and minimize conductor swing.A glass insulator V-string, sometimes called a V-suspension string, V-type insulator assembly, or V-shaped tension string, is formed by connecting two toughened glass insulator chains between the tower cross-arm and the transmission line conductor. The angle between the two strings typically ranges from 30° to 60°, depending on mechanical design requirements.


V-strings are commonly used in:

Long-span transmission lines

High-wind or heavy-storm areas

Line angle positions requiring enhanced stability

High-voltage (HV), extra-high-voltage (EHV), and UHV systems

Manufacturers like Nooa Electric provide complete V-string assemblies compliant with IEC, ANSI, and regional utility standards.

Why Use V-String Configurations?

V-strings reduce swing, distribute load, and improve safety under extreme mechanical stress.


Key technical benefits include:

✔ Reduced Conductor Swing & Galloping The dual-string structure stabilizes the conductor, lowering the risk of flashover and mechanical damage.

✔ Higher Mechanical Strength Loads are shared between two strings, making V-configurations ideal for long spans, heavy ice loading, and steep line angles.

✔ Improved Safety Margin V-strings maintain stable geometry even during extreme weather, ensuring reliability for 110kV, 220kV, 400kV, and 500kV networks.

✔ Enhanced Vibration Control Better damping reduces risk of fatigue fracture in fittings and conductors.

✔ Space Optimization on Towers V-strings can replace double I-strings while providing similar or greater stability.

Tension insulators U120

Tension glass insulators U120b

Tension toughened insulators U120b

Glass Insulators Packing

Tension insulators U120b packing

Toughened Glass Insulator Exhibitions & Clients

33kV glass electrical insulators Russia exhibitionGlass Insulators

Structure and Components of a Glass Insulator V-String

V-strings consist of two parallel glass insulator chains plus hardware like yoke plates, ball-and-socket fittings, and clevis accessories.

A typical Nooa Electric glass V-string assembly includes:
Two toughened glass disc insulator strings (U70B, U120B, U160B, U210B, etc.)
Yoke plates / V-yoke plates that connect the two legs
Ball-and-socket or clevis fittings
Corona rings for EHV/UHV applications
Armor rods or suspension clamps to protect the conductor
Hardware fittings compliant with IEC 61284 and IEC 60120

These components ensure optimal electrical and mechanical performance for long-term field operation.

Applications of Glass Insulator V-Strings

Used in long-span, windy regions, high-angle towers, and EHV–UHV transmission projects.


V-strings are used in:
High-voltage suspension towers requiring extra support
Mountain or desert transmission lines exposed to strong winds
Long spans exceeding 300–500 meters
132kV, 220kV, 330kV, 400kV, 500kV transmission systems
Line angle towers where standard I-strings are insufficient
Areas with high icing or conductor galloping risk
Utilities select V-strings to increase line stability and minimize maintenance over the insulators’ lifetime.
Company profile

Who We Are?

Nooa Electric Co., Ltd. - Chinese professional electrical insulators manufacturer with 21+ experience, covering an area of 70,000 square meters, and construction area is 50,000 square meters. There are more than 200 employees, including 25 technicians. The production capacity 3500000 pieces per year, and now setting up the new kiln and lines up to 10500000 pieces per year. We have been specialized in research and development of latest high-strength functional glass and power transmission insulators, which is the qualified supplier for State Grid Corporation of China and Southern State Grid Corporation of China, and is a participating unit of product standard formulation of the national electrical insulator standard committee.


What We Have?

Certificates & Reports: INTERTK, SGS, BV Certificates,Type Test Certificate.

Main Electric Insulators : Standard-type glass insulator (u40(ctv175)/u70(ctv254, ps70e)/u120/u160/u210/u300) , antipollution-type glass insulators (u120bp/u160bsp/u210bp), aerodynamic type glass electrical insulators (ug70bsa/u100bsa/u120bla), multi-umbrella type electric insulators, ground-wires type glass power line insulators (u70cn/u100cn/u120c), post insulator for line, pin glass insulator. Products are mainly used for transmission line insulation, suspension, support, tension conductors. They are divided into 5 major series: The standard type glass insulator 40-550kn, filth-resistant type glass insulators 70-420kn, aerodynamic type glass electrical insulators 120-300kn, multi-umbrella type electric insulators 120-300kn, and ground circuit type high voltage insulators, able to be used for line voltage from 10kv～1000kv.


Core Technology:

Automation Equipment: Siemens fully automatic feeding, stamping, temperature equalization, tempering, hot and cold shock control system.
Independent Product Model: U160BP/146/380/450, U160BP/155/380/450, U210BP/170/420/550 and U300BP/195/420/550.
Advanced Klin: Germany's new generation kiln control system, equipped with brand-new sensors and actuators, and equipped with a high-precision automatic batching system.
Qualification: Passed the quality, environment and occupational health system certification and obtained a number of invention patents.


Goal:

To be the world's largest glass insulators manufacturer.

Electric Insulators Certificates

Are u the electric insulators factory or trading company?
China Leading Electric Insulators Factory founded in 2002
What're your main power insulators?
Powerline Electric Insulators (glass insulators, porcelain insulators, composite insulators ), the fittings and hardwares of all kinds for high-voltage applications and related products.
Can I get some glass insulators samples?
Yes, powerline glass insulator sample order is available for quality check and market test.
What's your payment terms?
We usually accept all kinds of payment terms, T/T, L/C, Western Union.
How can you control your glass power line insulator quality?
For each glass insulator production processing, we have a complete QC system for the chemical composition, physical and electrical properties. After production, all glass power line insulators will be tested according to related standards, and the ex-factory test reports will be sent along with shipment documents.
Does your company accept customization?
We accept OEM service.
What's your warranty terms?
We offer 24 months warranty terms.
Do you have glass electrical insulators in stock?
Depends on your request, we have standard models (CTV254 & CTV175, U40B U70B U120B U160BL U240B U300B ) in stock. Some special product and big order will be newly produced according to your order.

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Contact Us

Room 2221, 22nd Floor, Building 1, Wanxiang Times Garden, No. 676, Renmin East Road, Furong District, Changsha City, Hunan Province, China
Phone : 0086 186-848-89358
Whatsapp : +8615274981317  
Email : info@nooaelectric.com
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