Solid Core Post Insulators standards and electrical design

Standards and electrical design are main aspects of Solid Core Post Insulators design. Post insulators are designed to comply with the demands of the level of electrical insulation and mechanical strength.

Solid Core Post Insulators

Solid Core Post Insulators Introduction:
Post insulators are designed to comply with the demands of the level of electrical insulation and mechanical strength, while also taking into account the environmental situation where the insulators are intended for service. To specify the correct standard outdoor porcelain solid core post insulator, the following characteristics have to be defined:
Lightning impulse withstand voltage, dry
Switching impulse withstand voltage, wet (when a switching impulse level is required)
Power frequency withstand voltage, wet
Mechanical failing load
Minimum nominal creepage distance
Fixing arrangement of top and bottom metal fitting
Color of glaze

Solid Core Post Insulators Standards:
ORIENT Insulators manufactures outdoor porcelain solid core post insulators with external metal fittings and outdoor operating rods with external metal fittings (for High Voltage Switchgears) according to standard IEC60273. Components according to other standards or special customer requirements can be supplied upon request.

According to IEC60273, an IEC post insulator is defined by the following designation:
IEC post insulator Type C10-1050-II:
C means outdoor post insulator with external metal fittings
10 means a minimum bending failing load of 10 kN
1050 means a lightning impulse withstand voltage, dry of 1050 kV
II means creepage distance class II (in reference to IEC60273)

According to IEC60273, an IEC operating rod can be defined by the following designation:
IEC operating rod Type T3-1050-II
T means outdoor operating rod with external metal fittings
3 means a minimum failing load torsion 3 kNm
1050 means a lightning impulse withstand voltage, dry of 1050 kV
II means creepage distance class II (in reference to IEC60273)

These designations do not always fully specify the insulator type; sometimes there are alternative constructions regarding the fixing arrangement and creepage distance included in the standards.

Solid Core Post Insulators Electrical Design:
The insulation performance of a post insulator column is a function of the height, creepage distance, arcing distance of the insulating part(s) as well as the number of insulator units for a defined height and follows the standards IEC60071 and IEC60273.


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Orient Group is a professional manufacturer and exporter of composite suspension insulator and porcelain disc suspension insulator.