Project
±800 kV Longdong To Shandong UHVDC Project
Jinhao developed an extra high mechanical strength insulator of 550 kN to meet the specific needs of SGCC for this project.
Three-alternating Profile
Cap And Pin Type Three-alternating Profile Toughened Glass Insulator U160BLT
A 160 kN three-alternating disc with 155 mm spacing, 330 mm diameter and 550 mm creepage, weighing 8.9 kg. The longest creepage path in our range inside a single disc.
160 kN
Creepage 550 mm
Spacing 155 mm
Ø 330 mm
Coupling 20
8.9 kg
Problems It Solves
Why Line Engineers Specify The U160BLT
- At extreme deposit density even alternating two-shed profiles eventually bridge
- Lengthening the string to buy creepage costs tower height and ground clearance
- Repeat pollution flashovers on existing strings force unplanned outages
Key Benefits
What You Get In Return
- 550 mm creepage, the highest in our standard range at 160 kN
- Three stepped shed diameters disrupt deposit continuity twice per disc
- Adds creepage without adding discs, so string length and tower clearance stay unchanged
- 85 kV dry and 50 kV wet power-frequency withstand voltage
Technical Data
U160BLT Specifications
Mechanical, electrical, radio influence and packing values as tested to IEC 60383 and GB/T 1001.1.
| Mechanical Failing Load | 160 kN |
|---|---|
| Spacing H | 155 mm |
| Diameter D | 330 mm |
| Creepage Distance | 550 mm |
| Ball And Socket Coupling Size | 20 |
| Wet Power-frequency Withstand Voltage | 50 kV |
| Dry Power-frequency Withstand Voltage | 85 kV |
| Dry Lightning Impulse Withstand Voltage | 130 kV |
| Puncture Withstand Voltage | 130 kV |
| Test Voltage RMS To Ground | 10 kV |
| Maximum RIV At 1000 kHz | 50 microvolt |
| Corona Extinction Voltage Pin/Cap | 18/22 kV |
| Power Frequency Arc | 0.12 s / 20 kA |
| Net Weight | 8.9 kg |
Materials And Construction
A toughened glass disc bonded to a hot-dip galvanized steel cap and steel pin with a zinc sleeve, using high-strength alumina cement cured in a 70 degrees C water bath for about one hour.
Certifications
- ISO 9001 Quality Management System
- ISO 14001 Environmental Management System
- ISO 45001 Occupational Health and Safety Management System
- ISO 20001:2018 Energy Management System
- SR10:2015 / ISO 26000-2011 Social Responsibility Management System
- CMA and CNAS recognition on selected products
Who It Is For
Buyers Who Standardise On This Model
- Utilities with lines inside heavy mining and coal industrial zones
- Projects specified at IEC pollution level IV
- Operators running string replacement programmes after flashover events
Comparison
How It Compares
Mechanically identical to the U160BSV and U160BD at 160 kN with 155 mm spacing and 20 coupling. It carries the longest creepage of the three at 550 mm and the largest ribbed diameter at 330 mm, so it is the choice when deposit severity rather than wind load sets the specification.
Application Scenarios
Where The U160BLT Is Installed
Open-cast mining and coal washing districts
Heavy cement and ore processing corridors
Retrofit of strings with a documented pollution flashover history
Manufacturing And Quality Control
The Four Stages That Decide Whether This Disc Reaches Your Tower
Toughening sets the mechanical rating, the thermal shock test removes defective shells, cementing fixes the fittings, and every finished unit is tested before it is packed.
5
Toughening And Tempering
Shells are heated close to the softening point, then high-pressure air jets cool the surface rapidly while the core cools slowly. The surface ends in compression at roughly 100 to 200 MPa with the core in tension, giving four to five times the mechanical strength of ordinary glass.
6
Thermal Shock Test
Shells are heated to about 300 degrees C and plunged into cold water, a drop of roughly 420 degrees C. Any unit carrying internal stress or an inclusion shatters here rather than in service. Survivors move on and the broken glass is recycled as cullet. A second thermal shock test follows to IEC 60383-1 and GB/T 1001.1.
7
Metal Fitting Assembly And Cementing
A hot-dip galvanized steel cap, steel pin and zinc sleeve are bonded to the toughened disc with high-strength alumina cement, then cured in a 70 degrees C water bath for about an hour so the cement develops full strength before handling.
8
Final Inspection And Testing
Every finished insulator is checked visually for cracks, bubbles, chips and bonding defects, then tested electrically for high-voltage withstand, insulation resistance and partial discharge, mechanically for tensile, bending and torsion strength, and environmentally for thermal cycling, pollution resistance and UV ageing.
Use Guide
Installing And Maintaining The U160BLT
Assemble the string with the matching ball and socket coupling size 20 and confirm that the security clip is fully seated on every unit before the string is lifted.
In service, inspect visually on routine patrols. A self-destructed disc is visible from the ground and the steel cap and pin continue to carry mechanical load until replacement. Clean in heavily polluted areas and replace broken units in the next planned outage. No complicated preventive tests are required.
We supply installation manuals, technical drawings and, for large projects, on-site installation guidance and string assembly training.
Customization Options
- Customised creepage distance for a specific pollution survey
- Special fittings and connection structures
- Colour packaging and marking customization
- Project-specific design under OEM and ODM arrangements
Related Projects
Lines Using This Class Of Disc
Related Products
Alternatives Worth Comparing
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
Anti-Fog Profile
U70BLP · 70 kN
A 70 kN anti-fog disc with 146 mm spacing, 280 mm diameter and 450 mm creepage, weighing 5.3 kg. Deep under-ribs hold a dry band…
Creepage 450 mm
Ø 280 mm
Coupling 16
Further Reading
Guides Covering This Model
Guide
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.
Guide
Self-Destruction In Toughened Glass Insulators Explained
Self-destruction is not a defect in the product, it is the product telling you something. Here is what causes it, what rate is normal, and why it is an advantage.
Answers
U160BLT Questions
What is the creepage distance of the U160BLT?
550 mm, the longest in our standard range, at 160 kN mechanical failing load.
What are the U160BLT dimensions and weight?
155 mm spacing, 330 mm diameter, 20 ball and socket coupling and 8.9 kg net weight.
What are its electrical withstand values?
50 kV wet power frequency, 85 kV dry power frequency, 130 kV dry lightning impulse and 130 kV puncture withstand voltage.
How does it compare with the U160BSV?
Same mechanical rating, spacing and coupling. The U160BLT adds 100 mm of creepage and 30 mm of diameter for 0.5 kg more weight per disc.
Get U160BLT Pricing And Test Data
Tell us the quantity and destination port. We will confirm lead time, packing configuration and the test report set that ships with the order.