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
Guide
Self-Destruction In Toughened Glass Insulators Explained
Self-destruction refers to the spontaneous breaking of toughened glass due to internal stress or impurities. It is an inherent characteristic of the material rather than a manufacturing fault, and it is the reason glass insulators are easy to maintain.
What Causes It
Tempering leaves the surface in compression and the core in tension. If an inclusion or a stress concentration sits in the tensile core, that balance can release, and the disc shatters. The steel cap and pin stay in place, so the string continues to carry mechanical load.
Why It Is An Advantage
A punctured porcelain disc looks identical to a good one and has to be found with live testing. A self-destructed glass disc is visible from the ground during a normal line patrol. You find it with a pair of binoculars instead of an outage window.
What Rate Is Acceptable
Our products have a low and controllable self-destruction rate in line with IEC and national standards. The main control is upstream. Shells are heated to around 300 degrees C and quenched in cold water, a drop of roughly 420 degrees C, and units carrying stress or impurities shatter in the factory. A second thermal shock test to IEC 60383-1 and GB/T 1001.1 screens what the first one missed.
Maintenance Implications
Regular visual inspection, cleaning in heavily polluted areas and timely replacement of broken insulators. No complicated preventive tests are required.
Related Products
Models Discussed In This Guide
Two-alternating Profile
U160BSV · 160 kN
A 160 kN two-alternating disc with 155 mm spacing, 300 mm diameter and 450 mm creepage, weighing 8.4 kg. Alternating shed diameters…
Creepage 450 mm
Ø 300 mm
Coupling 20
Keep Reading
Other Guides
How Toughened Glass Insulators Are Made From Batch To Pallet
Nine production stages turn quartz sand into a disc that carries 160 kN and shatters visibly when it fails. Here is what happens at each one and why it matters to the buyer.
How To Choose An Insulator Profile By Pollution Level
Standard, anti-fog, aerodynamic or alternating. The right answer depends on whether your deposit is a wet conductive film or a dry adherent powder.
Glass Versus Porcelain And Composite Insulators
The case for toughened glass comes down to one operational fact. A failed glass disc is visible from the ground and a failed porcelain disc is not.
Answers
Related Questions
How long do toughened glass insulators last in service?
Under normal operating and maintenance conditions the service life is generally 30 to 50 years.
How should glass insulators be maintained?
Regular visual inspection, cleaning in heavily polluted areas, and timely replacement of broken insulators. No complicated preventive tests are required.
Can glass insulators be used in heavy-pollution areas?
Yes. We recommend anti-pollution or anti-fog glass insulators with increased creepage distance, specially designed for coastal, industrial and high-pollution environments.
Are they suitable for high-altitude areas?
Yes. We can provide customized products optimized for high-altitude conditions with enhanced insulation performance.
Apply This To Your Own Line
Send us the route conditions and we will translate this into a specific model, creepage figure and string configuration.