Silicone composition
One-piece molded silicone housing without seams. High hydrophobicity, self-cleaning surface, UV resistance.
OSK silicone post insulators 10–110 kV
Electrical insulation of current-carrying parts in high humidity, aggressive environments and open atmosphere
Key features
Outdoor installation
Climatic design UHL1. Operation at temperatures from –60 to +40 °C, humidity up to 75% and atmospheric pollution level 1–4.
Lightweight
Load-bearing column made of fiberglass rod and crimped aluminum flanges without welded seams. Simplified installation and transportation.
Mechanical strength
Resistance to mechanical impacts and vandalism — as per datasheet and type test reports.
Where OSK silicone insulators are used
OSK silicone post insulators are designed for mounting and insulating current-carrying parts in electrical installations and switchgear with voltage of 10–110 kV AC at frequencies up to 100 Hz. They are used in outdoor switchgear conditions, on seacoasts, in areas with heavy industrial and natural pollution.
Alternative
- Porcelain and glass insulators: prone to chipping, breakage, accumulation of conductive pollution layer
- Heavy, require reinforced metal structures, more difficult to install
METAENERGY Solution
- Silicone organic coating: hydrophobicity, tracking and erosion resistance, UV resistance
- Lightweight, no welded joints, design suitable for outdoor installation
Design
The insulator consists of an insulating part—a solid-cast silicone organic composition—and a monolithic fiberglass rod. The internal cavity is sealed. The rod is crimped on both sides with high-strength aluminum flanges without recesses, which reduces the risk of water accumulation. The solid-cast shell, obtained by mold casting, provides resistance to moisture penetration under the shell.
Operating conditions
Climatic design UHL1 according to GOST 15150, ambient temperature from –60 to +40 °C, relative humidity up to 75% at 15 °C, altitude up to 1000 m above sea level. Insulators are designed for pollution level 1–4 according to GOST 9920. Manufactured according to TU 27.90.12.-005-97798631-2017.
Below is the line of METAENERGY post silicone insulators. The specific size is selected from the catalog for the project.
Products
OSK post silicone insulators are manufactured for voltage classes 10, 35 and 110 kV. Each size has an individual height and mounting modification, specified upon ordering.
All versions are based on a unified design: fiberglass rod, silicone housing, cast aluminum flanges.
OSK xxx/10-zz
10 kV post silicone insulators
Designed for medium voltage electrical installations and switchgear. Insulator height from 285 to 500 mm (range per catalog).
- Rated voltage 10 kV, maximum operating voltage 12 kV
- Used in conditions of heavy pollution and high humidity
- Lightweight, no welds on flanges
Manufactured according to technical specifications, parameters are agreed upon via questionnaire. Modification zz defines the configuration of mounting holes and threads.
OSK xxx/35-zz
35 kV silicone post insulators
Medium voltage insulators with height selected according to project (standard range includes heights of 400, 500, 570 mm and others).
- Rated voltage 35 kV
- UV and weather resistance, long-term operation without loss of dielectric properties
- Solid-cast housing — no internal cavities or seams
For precise height and mounting dimensions, use the catalog or request a specification sheet. Flange mounting is project-specific.
OSK 1100/110-zz
110 kV silicone post insulators
High-voltage insulators with a rated voltage of 110 kV. Insulator height 1100 mm (base model).
- Maximum operating voltage 126 kV
- Full lightning impulse withstand voltage 450 kV (per datasheet)
- Tracking and erosion resistance and hydrophobicity for coastal and industrial areas
Standard designation OSK 1100/110-zz, where zz is the flange modification. Complete electrical characteristics and dimensions per product datasheet.
Standard Sizes and Selection
Insulator designation: OSK xxx/yy-zz, where xxx — height in mm, yy — rated voltage in kV, zz — mounting modification. The main standard sizes available in the catalog are listed below. The complete list and exact dimensions are provided upon request.
Main Standard Sizes of OSK Insulators
| Designation | Rated Voltage, kV | Height, mm |
|---|---|---|
| OSK 285/10-xx | 10 | 285 |
| OSK 320/10-xx | 10 | 320 |
| OSK 400/10-xx | 10 | 400 |
| OSK 440/10-xx | 10 | 440 |
| OSK 500/10-xx | 10 | 500 |
| OSK 400/35-xx | 35 | 400 |
| OSK 570/35-xx | 35 | 570 |
| OSK 1100/110-xx | 110 | 1100 |
Comparison / key parameters
General characteristics of OSK insulators by voltage class. Exact values of electrical strength, impulse voltage and creepage distance are specified in the datasheet for the specific model.
| Parameter | 10 kV | 35 kV | 110 kV |
|---|---|---|---|
| Rated voltage | 10 kV | 35 kV | 110 kV |
| Maximum operating voltage | 12 kV | as per datasheet | 126 kV |
| Lightning impulse withstand voltage | as per datasheet | as per datasheet | 450 kV (for basic version) |
| Height, mm (row) | 285…500 | 400; 500; 570 | 1100 |
| Climatic version | UHL1 | UHL1 | UHL1 |
| Operating temperature | –60…+40 °C | –60…+40 °C | –60…+40 °C |
| Pollution degree | 1–4 | 1–4 | 1–4 |
OSK silicone insulators — UV, moisture and aggressive environment resistance confirmed by testing
Insulators are used on coastlines, in chemically active zones and in conditions of increased risk of mechanical damage — operating parameters according to the passport.
Advantages
OSK silicone insulators provide a range of operational advantages over traditional porcelain and glass alternatives.
Hydrophobicity and self-cleaning
The silicone surface repels water, prevents the formation of conductive bridges and maintains insulating properties even under heavy contamination.
Mechanical strength
Fiberglass rod and elastic sheath withstand impacts and vibrations — according to the type passport specifications.
Chemical and atmospheric resistance
The silicone compound is resistant to acids, alkalis, ultraviolet radiation, and sharp temperature fluctuations. No corrosion of metal flanges in marine climates.
Additional information for designers
No chips or breakage
Not subject to damage typical of ceramics during transportation and installation. Reduction of hidden defects.
Light weight
Low weight simplifies installation, reduces load on supporting structures, and allows the use of lighter metal structures.
No welded seams
Cast aluminum flanges without welded joints — operational at −60…+40 °C and sharp thermal cycles.
Tracking and erosion resistance
The housing material resists the formation of conductive paths even under surface flashover conditions and heavy contamination.
Resistance to personnel errors
The design tolerates unintentional impact loads during installation, reducing accident rates during mounting and operation.
Custom manufacturing
Modification of flanges, mounting holes and threads is performed according to drawings agreed with the customer within technical specifications.
Place in METAENERGY product range
OSK insulators are part of the family of insulators and voltage indication devices covering outdoor and indoor insulation tasks for switchgear.
Voltage class
10–110 kV
OSK post silicone insulators cover medium and high voltage classes, complementing the polymer insulator range of 1–35 kV.
Key feature
Silicone insulation for outdoor use
OSK is the only METAENERGY series with a silicone rubber housing for outdoor installations, combining hydrophobicity and UV resistance.
Related products
Insulators, indication
For indoor installation, we recommend IO epoxy post insulators; for bushing insulators — IP. Voltage control — KINN kits with capacitive dividers.