Hybrid insulators take the advantage of porcelain’s undisputed mechanical strength as required for post insulator applications and composite’s excellent pollution performance in extreme environmental conditions and high pollution areas like industrial, desert or coastal regions.

Advantages of the Hybrid vs. other post insulator materials

PorcelainRTV
coated
porcelain
CompositeHybrid
Deflection under
Bending Load
Performance
++++-++
Compression
Strength
++++-++
Product
Lifetime
+--+
Pollution
Performance
-++++++
Maintenance--++

Hybrid insulators are the optimal technical solution for HVDC projects and highly contaminated and polluted areas: high mechanical strength, excellent pollution performance, long lifetime, minimum deflection and maintenance expenditures reduced to a minimum.

PPC Hybrid Post Insulators are successfully field tested and delivered to clients for projects all over the world.

Dimensions

Length per piecemax. 2.830 mm / 111 in
Shed diametermax. 300 mm / 12 in

Hybrid principle

The porcelain core is manufactured using the PPC Isostatic process giving better dimensional control of the inserts and much better consistency of the products compared to the conventional production process.

High pressure injection molding is required due to the HTV silicone rubbers high viscosity. The silicone housing is fully bonded to the porcelain solid core, perfectly managing the „triple point“ (fitting-rubber-core) interface. Thanks to the high pressure involved in this operation, the rubber housing adheres directly to the fitting without the need for artificial sealing.

Frequently Asked Questions

Are Hybrid Insulators a combination of Porcelain and Composite Insulators?

Yes, Hybrid Station Post Insulators have Solid Porcelain Core made of High-Strength Porcelain & Housing made of HTV Silicone.

After how many years does Hydrophobicity break down?

The performance of Hybrid Station Post Insulators largely depends on service conditions and geographical locations / sites where the insulators are normally installed. Environmental conditions are also known to play a significant role in determining the lifetime of hydrophobicity.

Can Hybrid posts be RTV coated after 15 years e.g. (if hydrophobicity would be lost)?

Yes, Hybrid Station Post Insulators can theoretically be re-coated to restore reduced or lost hydrophobicity (i.e. restoration of silicone housing), but the process in general depends on how severe is the loss of hydrophobicity?

Where does the hybrid concept / requirements is coming from?

The need of Hybrid Station Post Insulators arise because of: Requirement of insulators to continue to operate or perform in case of harsh environmental conditions (incl. high pollution). Hybrid Station Post Insulators offer a unique combination of: High-Strength Alumina Porcelain for Superior Mechanical Performance + Silicone Housing for Excellent Pollution Performance. Hybrid Station Post Insulators also well cater the need of insulation requirements in case of DC applications.

Are there any IEC Standards that Hybrid Insulators can refer to?

Yes, IEC TS 62896:2015 (Hybrid insulators for a.c. and d.c. for high-voltage applications - Definitions, test methods and acceptance criteria)

What kind of testing is required?

Test requirements as per IEC TS 62896:2015: Hybrid insulators for a.c. and d.c. for high-voltage applications - Definitions, test methods and acceptance criteria.

How strong is PPC’s silicone adhesion on to the surface of porcelain core?

Design Tests (one-time tests) that PPC has already performed in co-operation with SEDIVER (dating to 2012 at St. Yorre Lab., FR.) ... answer more detailed

Are Hybrid Insulators resistant to erosion and tracking?

Yes, Hybrid Station Post Insulators are resistant to erosion and have no tracking. HTV-Silicone with high content of Alumina Trihydrate (ATH) outpowers Liquid Silicone Rubber (LSR)!

Up to which system voltage limits can Hybrid Insulators cater?

Up to 1200kVAC and 1100kVDC

What cantilever strengths are possible in case of Hybrid Insulators?

From 6kN onwards and > 20kN. Please contact us for more details to cater your needs.

According to which international standards are Hybrid Insulators?

Hybrid Station Post Insulators are acc. to IEC & ANSI Standards

How do we assure the tight sealing at the ends?

The silicone is injected directly on the fittings covering the porcelain, cementing and the flange.

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