KWIS composite silicone post insulators are intended for rated voltages of 20 kV and MV overhead apparatus.
Benefits of KWIS Post Insulators:
- Excellent mechanical and electrical properties,
- Hydrophobic properties of the silicone rubber insulation cover ensure high resistance to dirt and self-cleaning properties,
- Lower risk of mechanical damage during transport, assembly and operation,
- Resistance to UV radiation, ozone, moisture,
- Shock and impact resistance – suitable for use in areas of seismic activity,
- Capable of carrying specific torsional loads.
A KWIS post insulator consists of a load-bearing core, metal end fittings and an insulating sheath. The supporting core is a glass-epoxy rod made of stress corrosion-resistant ECR glass fibre, saturated with epoxy composition. The rod has a very high mechanical tensile and bending strength and is capable of carrying specific torsional loads. Metal end fittings are fixed on the core by clamping. The grey LSR silicone rubber insulation cover is moulded on the core by injection moulding. The cover tightly encompasses the epoxy-glass rod between the end fittings and effectively protects it against aggressive environmental factors.
|
GENERAL PROPERTIES |
Value |
Unit |
||
|
KWIS-4-280 |
KWIS-4-305 |
|||
|
Length |
280 |
305 |
mm |
|
|
Number of Sheds |
Large |
4 |
4 |
pcs. |
|
Small |
3 |
3 |
pcs. |
|
|
Weight |
1.8 |
1.9 |
kg |
|
|
End Fittings |
Galvanized Steel Forgings |
|||
|
ELECTRICAL PROPERTIES |
Value |
Unit |
|
|
KWIS-4-280 |
KWIS-4-305 |
||
|
Creepage Distance |
630 |
655 |
mm |
|
Arcing Distance |
250 |
270 |
mm |
|
Rated Operating Voltage |
20 |
20 |
kV |
|
Alternating Withstand Voltage 50 Hz in Rain |
70 |
70 |
kV |
|
Lightning Impulse Withstand Voltage |
145 |
145 |
kV |
|
MECHANICAL PROPERTIES |
Value |
Unit |
|
|
KWIS-4-280 |
KWIS-4-305 |
||
|
Rated Tensile Load STL |
30 |
30 |
kN |
|
Tensile Load in Product Tests RTL |
15 |
15 |
kN |
|
Rated Bending Load SCL |
8 |
8 |
kN |
|
Maximum Designed Bending Load MDCL |
4 |
4 |
kN |
KWIS-4-280 and KWIS-4-305 post insulators are compliant with PN-EN 62231.
KWIS-4-280 and KWIS-4-305 post insulators are provided with certificates confirming compliance with the aforesaid requirements.