Station Post Insulators C6-170
C6-170 Station Post With 46 kN Cantilever Strength
C6-170 is a solid-core porcelain station post for substation busbar and equipment support: 165 mm across the sheds, 445 mm tall, with 850 mm of creepage, a 46 kN cantilever strength and a 1500 N-m torsion rating. At 15 kg it is the heavy-duty post in the range, used where a busbar support has to resist both short-circuit forces and disconnector operating torque.
Key Benefits
- 46 kN cantilever strength for short-circuit force on rigid busbars
- 1500 N-m torsion strength for disconnector and switch mountings
- 850 mm creepage on a 445 mm height
- 170 kV lightning impulse withstand voltage
Technical Features
- Solid-core porcelain, 165 mm shed diameter, 445 mm height
- 100 kV power-frequency dry and 70 kV wet withstand voltage
- Grey or brown glaze
- 15 kg net weight per unit
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.
| Available Colors | Grey, Brown |
|---|---|
| Diameter (D) | 165mm |
| Spacing (H) | 445mm |
| Creepage Distance | 850mm |
| Net Weight Each | 15kg |
| Cantilever Strength | 46kN |
|---|---|
| Torsion Strength | 1500N-m |
| Power Frequency Dry Withstand Voltage | 100kV |
|---|---|
| Power Frequency Wet Withstand Voltage | 70kV |
| Lightning Impulse Withstand Voltage | 170kV |
Application Scenarios
- Rigid busbar support in air-insulated substations
- Disconnector and earthing switch bases
- Support structures for current and voltage transformers
Who It Is For
- Substation EPC contractors
- Switchgear and disconnector manufacturers
- Utilities maintaining air-insulated switchyards
Problems It Solves
- Busbar supports that fail under short-circuit electromagnetic force
- Post insulators that twist when a disconnector is operated
- Insufficient creepage on substation posts in polluted air
How This Design Differs From the Alternatives
Compared With C4-125 station post
Much higher cantilever and torsion capability, 46 kN and 1500 N-m against 4 kN and 800 N-m, with 850 mm creepage instead of 500 mm.
Compared With ANSI 57-3 line post
A substation post designed for vertical support and torsion, where the line post is designed to carry a conductor on a pole or tower arm.
Specifying and Installing This Unit
- Calculate the short-circuit force on the busbar and compare with the 46 kN cantilever rating
- Check the operating torque of the disconnector against the 1500 N-m rating
- Mount on a flat, shimmed base so the load is not applied eccentrically
- Torque the flange bolts evenly to avoid cracking the porcelain foot
Questions About This Product
How do we size cantilever strength for a busbar?
Work out the peak electromagnetic force from the short-circuit current, the conductor spacing and the support span, then apply your safety factor and compare with the 46 kN rating.
Why does torsion strength matter?
When a disconnector is operated, the reaction torque passes into the post. The 1500 N-m rating is what allows this post to be used as a switch base rather than only as a busbar support.
What creepage does this give?
850 mm per unit. Compare that with your substation pollution class requirement in mm per kV.
Can the flange drilling be made to our pattern?
Send the drilling and fitting drawing with the enquiry and we will confirm what can be supplied against it.
Is a cracked post repairable?
No. A crack through the porcelain means the dielectric is pierced and the unit must be replaced.
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Request A Quote for Station Post Insulators C6-170
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.