Double umbrella disk Suspension Insulators UG120B146/450D 16R
120 kN Double Umbrella Disc for Heavy Contamination
UG120B146/450D 16R is a 120 kN toughened glass disc with a double umbrella shed: two stacked skirts on a 280 mm diameter that give 450 mm of creepage on a 146 mm spacing. The double skirt is designed for sites where contamination bridges the under-ribs of a conventional fog profile, such as desert dust combined with occasional dew. Net weight is about 6.3 kg per unit.
Key Benefits
- Double umbrella shed resists bridging where a single fog skirt fills with deposit
- 450 mm creepage with a 120 kN failing load and a 60 kN tension proof
- 16 mm coupling matches the standard 120 kN hardware set
- 120 kV dry lightning impulse withstand voltage
Technical Features
- 280 mm double umbrella shed, 146 mm spacing
- 80 kV dry and 45 kV wet power-frequency withstand voltage
- 130 kV puncture withstand voltage
- 50 uV maximum RIV at 1000 kHz
Published Figures for This Design
The values below are the catalogued figures for this type. Where a figure your specification needs is not listed, ask and we will confirm it in writing rather than estimate it.
| Diameter (D) | 280mm |
|---|---|
| Spacing (H) | 146mm |
| Creepage Distance | 450mm |
| Coupling Size | 16mm |
| Net Weight Each | 6.3kg |
| Mechanical Failing Load | 120kN |
|---|---|
| Tension Proof | 60kN |
| Dry Power-frequency Withstand Voltage | 80kV |
|---|---|
| Wet Power-frequency Withstand Voltage | 45kV |
| Dry Lightning Impulse Withstand Voltage | 120kV |
| Puncture Withstand Voltage | 130kV |
| Test Voltage RMS to Ground | 10kV |
|---|---|
| Maximum RIV at 1000 kHz | 50μV |
Application Scenarios
- Desert and semi-arid lines with fine dust and morning dew
- Lines downwind of quarries, cement plants and mine haul roads
- Sites where washing intervals need to be extended
Who It Is For
- Utilities operating lines in heavy contamination zones
- EPC contractors on desert transmission projects
- Maintenance teams trying to cut line washing frequency
Problems It Solves
- Fog profile under-ribs that fill with fine dust and lose effective creepage
- Flashover events after the first dew following a dry season
- Line washing programmes that cost more than the insulators
How This Design Differs From the Alternatives
Compared With LXHP-120 / U120BP fog profile
Same 120 kN rating, 280 mm shed and 450 mm creepage, but the double umbrella geometry keeps the leakage path open when fine deposit fills a fog under-rib.
Compared With UG70B146/450D 16R
Identical geometry and creepage at 120 kN instead of 70 kN, for heavier conductors on the same contaminated route.
Specifying and Installing This Unit
- Select the double umbrella where deposit is fine and dry rather than salt-laden
- Size the string against the 60 kN tension proof value
- Record washing intervals before and after the change to confirm the benefit
- Do not mix umbrella and fog profiles inside one string
Questions About This Product
How is a double umbrella different from a fog profile?
A fog profile puts the extra creepage into deep under-ribs under one skirt. A double umbrella stacks two skirts, so fine deposit that would bridge an under-rib does not close the leakage path.
Does it need the same string length as a fog disc?
Yes, the spacing is 146 mm and the creepage 450 mm per unit, matching the fog profile 120 kN unit, so the string length calculation is unchanged.
What does the 16R suffix mean?
It records the 16 mm coupling in the manufacturer designation. The full designation is what we quote against, so the coupling cannot be misread.
Is this available in porcelain?
The double umbrella units in this range are toughened glass. If you need an equivalent in porcelain, send the specification and we will tell you what the closest design is.
What is the routine proof load?
60 kN tension proof, applied to every unit in production. The 120 kN figure is the failing load from destructive type testing.
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Request A Quote for Double umbrella disk Suspension Insulators UG120B146/450D 16R
Send the quantity, the destination port and the standard you buy against. Routine test records ship with the goods and type test reports are available on request.