Three-alternating Profile
U160BLT · 160 kN
A 160 kN three-alternating disc with 155 mm spacing, 330 mm diameter and 550 mm creepage, weighing 8.9 kg. The longest creepage…
Creepage 550 mm
Ø 330 mm
Coupling 20
Three-alternating Profile
Three-alternating Profile Toughened Glass Insulators
The longest creepage in our range at 550 mm, for the worst solid particle pollution a line has to live in.
Models In This Profile
Three-alternating Profile Insulators We Stock And Build
Every model below is listed with the mechanical and electrical data from our own test records.
The Problem
What This Profile Is Solving
Where deposit density is extreme, even an alternating two-shed profile eventually bridges. Adding discs to the string to buy creepage costs tower height, clearance and weight on every structure.
Who Specifies It
- Utilities with lines inside heavy mining and coal industrial zones
- Projects at IEC pollution level IV and above
- Operators replacing strings with a history of pollution flashover
Why This Geometry
Core Advantages
- 550 mm creepage at 160 kN, 22 percent more than the two-alternating profile
- Three stepped shed diameters disrupt deposit continuity twice per disc
- Buys creepage inside the same disc instead of lengthening the string
- 130 kV dry lightning impulse withstand voltage
Application
Where Three-alternating Profile Discs Are Installed
Open-cast mining and coal washing districts
Heavy cement and ore processing corridors
String replacement programmes after pollution flashover events
Industries
Sectors Using This Profile
UHV And EHV Transmission Lines
Lines at 330 kV and above carry the load of an entire region. A single insulator failure on a UHV circuit is not a local outage, it is a…
Substations And Switchyards
Substation yards concentrate equipment, heat and pollution in a small footprint. Strings here are short, heavily loaded and surrounded by…
Other Profiles
Compare Against The Rest Of The Range
Standard Profile Toughened Glass Insulators
The baseline disc for clean and lightly polluted lines where creepage does not have to be bought at the price of weight…
Anti-Fog Profile Toughened Glass Insulators
Deep-ribbed discs that push creepage up without a matching jump in diameter, for coastal, chemical and urban air.
Aerodynamic Profile Toughened Glass Insulators
Wide open sheds with no deep ribs, shaped so wind takes the dust off instead of packing it in.
Answers
Three-alternating Profile Questions
Why not just add more discs to the string instead?
Adding discs buys creepage at the cost of string length, tower height and ground clearance. The U160BLT puts 550 mm of creepage inside one disc so the string geometry stays as designed.
What is the disc diameter and weight?
330 mm diameter and 8.9 kg net weight at 160 kN mechanical failing load, with 155 mm spacing.
Is this profile suitable for coastal salt fog?
It will work, but salt fog is wet-film pollution and the anti-fog profile is designed for it. Alternating sheds are optimised for dry solid particulate.
Specify The Right Three-alternating Profile Disc
Send us the voltage level, mechanical load and pollution survey for your route and we will confirm the model and creepage before you commit to a quantity.