PPC offers the most comprehensive range of porcelain post insulators up to highest AC and DC system voltages with the most progressive technology, engineering and life time. Short production time, tighter tolerances, flexible design, extra-high mechanical strength and extended creepage distances are possible by isostatic process.

Further optimized insulator designs have been developed by PPC with ultra-high mechanical strength and maximum extended creepage distances.

It was not possible to manufacture such insulators using conventional porcelain production technology, but the Isostatic technology enables such designs to be produced by PPC Insulators.


Length per piecemax. 2.830 mm
max. 111 in
Shed diametermax. 650 mm
max. 25.4 in
Core diameter60 mm - 295 mm
2.4 in - 11.6 in
Creepage distanceup to 55 mm/kV
up to 2.2 in/kV

Our advanced post designs include the following advantages:

  • fewer single sections per insulator column, therefore fewer metal parts
  • shorter column heights while maintaining IEC 60815 requirements and fulfilling all additional electrical requirements
  • improved flashover distance
  • better pollution performance via improved Form Factor acc. to IEC 60815
  • reduced weight, better material utilization, optimized logistics
  • Decreased metal usage (fewer points of exposure to corrosion)
  • less field concentrating positions
  • improved mechanical stability, rigidity and robustness

Depending on environmental conditions and the requested pollution performance of the insulator, we are able to produce all possible shed designs as defined in the IEC 60815 including:

  • alternating shed
  • plain shed
  • under rib shed
  • rain shed
  • plus unique shed designs e.g. for 800kVDC applications

IEC Post Insulators

PPC Insulators production facilities for IEC station post insulators manufacture in full accordance to IEC60273. Operating rod columns for disconnectors are manufactured corresponding to the relevant post insulators. Insulation requirements are available in ratings from BIL 60kV to 2550kV.

Insulator creepage distances are in accordance with IEC60273 and IEC60815. Special requirements, such as other creepage distances, special shed forms, other top bending moments or pitch circle diameters, can also be offered upon request.

60-95 kV450-650 kV1425-1675 kV
125-170 kV750-950 kV1800-2100 kV BIL
200-325 kV1050-1300 kV2250-2550 kV

ANSI Post Insulators

The PPC production facilities for TR station post insulators manufacture in full accordance with ANSI C29.9. Insulation requirements are available in ratings from 95kV to 2050kV. Special requirements can be also offered upon request.


Frequently Asked Questions

What is the maximum possible cantilever strength offered by PPC Insulators?

The maximum bending strength PPC can offer for its post insulators is about 40kN.

What is the maximum creepage distance PPC Insulators can utilize on a post insulator?

Acc. to IEC TS 60815-1:2008, IEC TS 60815-2:2008 and IEC TS 60815-4:2016

How many single piece columns can PPC insulator offer for a defined class of BIL?

For example, BIL 1050 can be offered as a single piece unit, BIL 2550 can be offered as a 2-piece design.

What maintenance do we recommend on our insulators?

None in particular, however, depending on environment occasional cleaning can be considered.

Is Isostatic a Wet or Dry process?

The Isostatic process is a Wet process, the drying process is performed in the early stages of production. The key element of Wet process is that the materials are mixed with water to ensure a homogeneous slip, comprising a mixture of clays with 50% water. The Traditional Wet process, used for several thousand years for many ceramic products, forms the product in its wet form which is then dried. However, the Isostatic process dries the material first.

Is there any difference in the product produced conventionally versus isostatic?


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