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RIS Capacitive Bushing

RIS Capacitive Bushing

RIS Capacitive Bushing

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RIS Bushing Epoxy Resin Impregnated Fiberglass（RIS Bushing）

The main purpose of a transformer bushing is to safely transfer power through the earthed transformer tank. OIP and RIP type bushings have for many years been the industry standard for transformers, and in general have performed satisfactorily. However, as our transformer assets age, paper deterioration in these bushings can eventually cause these bushings to fail, some even catastrophically. Currently, there are two technologies on the market: resin-impregnated fiberglass (a proprietary technology trademarked RIS) and resin-impregnated synthetic (RIS). The RIS technology has been on the market since the early 2000s while the RIS technology is a relative newcomer to the market. 

What are RIS Capacitive Bushings?
The RIS bushing utilizes a finely graded condenser design and a core insulation that is composed of fiberglass impregnated with epoxy resin wrapped between capacitive screens.

What is the Difference Between RIS and RIF?
RIS which stands for Resin Impregnated Synthetic is the industry’s generic terminology for the dry type (non-oil), paperless bushing. RIF which stands for Resin Impregnated Fiberglass is a registered trademark name for the dry type (non-oil), paperless insulation technology developed by RHM International. Even though the RIF bushing falls within the RIS category of bushings it is a distinctive technology that offers many unique advantages over the other RIS bushings currently on the market. The RIF bushing technology is the more mature bushing technology, introduced to the market in 2003 and having over 22,000 units installed worldwide. The RIS bushing is a relative newcomer which was introduced to the market in 2014. A major difference between RIS and RIF is how the condenser core is manufactured. The RIS bushing condenser cores are wound with synthetic fabric after which the wound condenser core is encapsulated under vacuum where it is impregnated.
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