Abstract: In this paper,the define and requirement of heat-resistibility of epoxy resin casting workpiece for high voltage switchgear were discussed.The performances of dielectric constant(e)and dielectric loss(tanδ)?flexural elastic modulus(Ef)?specific heat(Cp)near glass transition temperature(Tg)or heat de-flection temperature(HDT)as well as the relationship between Tg and HDT were studied,which illustrates that the heat-resistibility of epoxy resin casting workpiece charactered by Tg or HDT is reasonable.Ex-cepting insulation,epoxy resin casting workpiece has a function of support,the descend of mechanical strength is before other perpormances change,so the resistible temperature of epoxy resin casting work-piece should defined according to the required mechanical strength at the temperature.

Abstract: The preparation of korshunskite Mg 2 (OH) 3 Cl·4H 2 O whisker was investigated.And the korshunskite Mg 2 (OH) 3 Cl·4H 2 O whisker samples were prepared by liquid reaction method at the atmospheric pressure.Based on the test results of SEM and XRD,the effects of MgCl 2 concentration,CaCl 2 concentration,molrate of active MgO to MgCl 2 ,reaction temperature and ripening time on the preparation of korshunskite whisker are discussed.And the best technological conditions for preparing the korshunskite whisker are put forward as:(1)the concentration of MgCl 2 is between1.5mol·L -1 and2.5mol·L -1 ;(2)pH value is between7and8;(3)the concentration of CaCl 2 is between1.1mol·L -1 and1.6mol·L -1 ;(4)the mol rate of active MgO to MgCl 2 is between0.05and0.2;(5)the reaction temperature is30℃;(6)the ripening time is between54hours and72hours when the ripening temperˉature is30℃.The korshunskite Mg 2 (OH) 3 Cl·4H 2 O whisker of about145μm/long and about0.6μm diametrally wide is obtained.

Abstract: This text states the brief of the cable accessories,expatiate the developing history of the cold shrink power cable accessories,specification and applying area.It introduces the conˉstruction and researching,especially expatiates the selection of the raw material and designing.

Abstract: Based on the mechanism of flashover on polluted insulator,the preventions of flashover on polluted electric equipment's external insulation are discussedSome necessary measures and new preˉvention technologies are introducedIt is pointed out that external insulation with correct design and high insulation level,and scientific maintenance of power network are the basic preventions of pollution flashover which paralyzes power network

Abstract: This article summarizes the development of phosphorated epoxy resin in Japan.The molecular structure,synthesis,mechanism of reaction of9,10—dihydro-9-oxa-10-phosˉphaphanthrene-10-oxide(DOPO)with epoxy and use of the phosphorated epoxy in halogen-free and fire retardant copper clad laminate are introduced.

Abstract: The related theories and the practical applications of single fiber pull-out test in fiber reinforced composites were systematically reviewed in the paper.

Abstract: The proper activity controller agent and its effective activity retarding action in the silicone elastomer hydrosilylation vulcanization system were obtained for one kind of pouring silicone rubber dielectric used in electronic mould.The cause of catalyst poisoning and poisoning inhibitation method were obtained experimentally which can be used in actual application for the pouring silicone rubber system and the vulcanization rubber stickiness problem is solved.

Abstract: Thermal decomposition mechanism and non-isothermal kinetics of the Mg,Al-hydroˉtalcite were investigatedThe Mg,Al-hydrotalcite flame-retardant agent samples were prepared by precipitation using the one-step reaction method at the atmospheric pressureAnd the study results show that the thermal decomposition mechanism function of the Mg,Al-hydrotalcite is as the following:G((α)=(1-(α) -1 -1

Abstract: The basic principle of dielectrophoresis relating to the technology of biochip manipulated by electromagnetic field is analyzed from the aspect of dielectric physics and its correlative applications are introduced.The application prospect of dielectrophoresis in the technology of biochip is discussed.

Abstract: This paper introduces a new type EHV generator,Powerformer.The main difference between a Powerformer and a traditional generator is the insulation.The Powerformer is made of EHV or HV XLPE cable.The Powerformer generates HV/EHV avoiding an ascending transformer and the energy generated by the Powerformer is input the grid directly.It also describes the cooling system,the advanˉtages and disadvantages of the Powerformer.The future development of the new type generator is prospected.

Abstract: The article introduces a new type of instrument for automatically measuring insulating oil dielectric loss.The principle and solution of the system are stated,and the measuring errors are anaˉlyzed.The method for improving the measurment precision and the anti-disturbance measures are inˉtroduced in detail.The experiment proved that the measurement result is precise and steady.The inˉstrument is of high automatic degree and is suitable for using widely.

Abstract: The resistivity,non-linear properties ofα-SiC anti-corona system can be improved byβ-SiC mixed intoα-SiC.The results show that the resistivity ofα-SiC anti_corona system reduce to1.34×10 7 Ω·m from7.89×10 7 Ω·m,non-linear coefficient ofα-SiC anti_corona system increase to1.695from1.527and corona voltage of stator bar of large generator increase353%.Theα-SiC anti_corona system modified byβ-SiC can be used to large generator.