KWIS Apparatus Post Insulators

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  • Izolatory wsporcze aparatowe KWIS

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.

 

Dane techniczne

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.