NANJING ZHIDA ELECTRIC COLTDNANJING ZHIDA ELECTRIC COLTDAug.1 2010Aug.1 2010 Bushing Device that enables one or several conductors to pass through a partition such as a wall or a tank, and insulates the conductors from it; the means of attachment (flange or fixing device) to the partition forms part of the bushing .Applied place Transformer、reactor、switch、circuit breaker、 transformer-cable terminal、through a wall or floor 。main insulation1.Condenser bushing2.Un-Condenser bushinga ) a ) Oil impregnated paperOil impregnated paper（OIPOIP）condenser bushing condenser bushing b )Epoxy resin impregnated paper（RIP）condenser bushingc )Gas-insulated bushingc )Gas-insulated bushingd )Liquid-filled bushinge )Cast bushingf )Combined insulation bushingTYPE OF BUSHINGSBUSHING FOR GISHIGH CURRENT BUSHINGOther bushings Other bushingsOil-Oil bushingOil-Oil bushing(RIP) (RIP)Oil-SFOil-SF6 6bushing bushing(RIP) (RIP)transformer transformercable boxes cable boxesGIS GIStransformer transformerOIP&RIP CONGDENSEROIP&RIP CONGDENSER TRANSFORMER BUSHINGTRANSFORMER BUSHINGtransformertransformerType of transformer bushingsType of transformer bushingsOil-Air bushingOil-Air bushing(OIP) (OIP)Oil-Oil bushingOil-Oil bushing(RIP) (RIP)Oil-SFOil-SF6 6bushing bushing(RIP) (RIP)The bushing is built up around a centre tube on which The bushing is built up around a centre tube on which the condenser body is wound, The upper insulator, the condenser body is wound, The upper insulator, lower insulator, top chamber and mounting flange are lower insulator, top chamber and mounting flange are held between the end plates by the centre tube.held between the end plates by the centre tube. Oil-impregnated paper bushing.Oil-impregnated paper bushing. Porcelain insulator.Porcelain insulator. High quality transformer oil fills the space between the condenser High quality transformer oil fills the space between the condenser body and the porcelain. body and the porcelain. Sealing is accomplished by oil-resistant rubber gaskets in grooves.Sealing is accomplished by oil-resistant rubber gaskets in grooves. The mounting flange is equipped with a test The mounting flange is equipped with a test tap.Thetap.The top chamber is top chamber is equipped with an oil level gauge. equipped with an oil level gauge. The lower end is shielded by a separated shield.The lower end is shielded by a separated shield. Draw-leadDraw-lead（rod) or solid rod conductor connection.rod) or solid rod conductor connection. The bushing is mounted with an inclination of maximum 30 degree The bushing is mounted with an inclination of maximum 30 degree from the vertical. from the vertical.Oil-Air bushing (OIP)Oil-Air bushing (OIP)1、Outer terminal 2、Top chamber 3、Set of springs 4、Air side porcelain insulator 5、Condenser body 6、Test tap 7、Mounting flange 8、CT-Pocket 9、Oil side porcelain insulator 10、End shieldBushing structureStructure of other brand bushingStructure of other brand bushingOil-Air transformer bushingOil-Air transformer bushingOIP OIP condenser transformer bushings are used for insulating and support purpose on transformer.The bushing itself is a completely sealed unit consisting of oil impregnated paper and foil wound onto a conductor.transformertransformerOil-Air bushingOil-Air bushingOil-Air bushingOil-Air bushingThe outdoor porcelains, with alternating long-short shed form, offers superior performance under polluted and severe weather conditions.The bushing consists of core container, porcelain and flange.The connecting flange incorporates a self grounding test tapping for capacitance and tan measurement During periodical maintenance. A venting plug for transformer turret evacuation is provided. The bushing may be inclined up to 30 degrees from the vertical.Oil-Air bushingOil-Air bushingThe typical failures of The typical failures of transformer bushingstransformer bushingsInsulation structure of TRENCH bushingBreakdown of lower insulatorBreakdown of lower insulatorExternal flashover External flashover PuncturePuncture of condenser bodyPoor sealing, result in water inflowPoor sealing, result in water inflowPoor sealing, result in water inflowPoor sealing, result in water inflow