Modern Electric Insulating Materials for the …

1 ISSN 1068-3712, Russian electrical Engineering, 2009, Vol. 80, No. 3, pp. 123 127. Allerton Press, Inc., Russian Text Papkov, Mel nichenko, Pak, Kuimov, 2009, published in Elektrotekhnika, 2009, No. 3, pp. 4 9. 123 2009 marked the 50-year anniversary of when theElinar Holding Company (Elinar HC) began to man-ufacture Electric Insulating Materials (EIMs) based onmica. In 1959, as a result of a directive of the Councilof Ministers of the Soviet Union, a factory founded in1879 to produce cellulose paper passed under thecontrol of the Ministry of Electric Industry of theSoviet Union and was reorganized to produce mica-loaded paper and Electric Insulating Materials on present, the organizational structure of the com-pany represents a vertically organized holding thatincludes enterprises that produce mica-containingpapers and EIMs on their basis, as well as enterprisesthat supply basic components (films, glass fabric,mica) to produce EIMs.

2 Since 2007, the COGEBIG roup, which is one of the world s largest manufac-turers of mica-containing paper and EIMs on theirbasis, has been a member of the Elinar HC. COGEBI manufacturing enterprises are located in Belgium, theCzech Republic, the United States, Malaysia, products manufactured by the COGEBY Groupare mica-containing tapes for vacuum pressure impreg-nation (VPI) and resin rich (RR) processing technolo-gies used in manufacturing turbo and hydrogenerators,large Electric machines, traction motors, and sheet-pressed mica-containing Materials for the different pur-poses, as well as mica-containing tapes for the cableindustry. Among the many customers of the COGEBYG roup, there are well-known companies, such as Sie-mens, ABB, Nexans, and Alstom. With the involvementof the COGEBY Group in the Elinar HC, the produc-tion and research potential of the holding company hasgreatly increased.

3 The nomenclature of Elinar HCproducts allows the company to deliver EIMs for man-ufacturing of Electric machine turnkeys, as well as todevelop new products that meet very high requirementsof Electric paper gives the results of the company sactivities on the development and improvement, aswell as progress in the production, of EIMs forrecent Insulating MATERIALSFOR insulation SYSTEMS OF TURBOAND HYDROGENERATORSAND HIGH-VOLTAGE MOTORSP reimpregnated glass mica tapes of class-F heatresistance produced by the Elinar HC under the trade-mark of Elmicatherm 1 52409 and 55409 for ResinRich technology (an Elmicatherm insulation system forturbo and hydrogenerators), do not yield to similarmaterials among the world s leading producers of EIMsin their technical characteristics. The technical charac-teristics of Elmicatherm tapes are cited in Table 1.

4 Theuse of Elmicatherm 52409 tape allows for a consider-able decrease in the value of the dielectric dissipationfactor at high temperatures, provides class-F heat resis-tance (155 C) and, as practice has shown, completelysatisfies the stringent requirements applied by manu-facturers of turbo- and hydrogenerators to the insula-tion of activities in this direction have finished withintroduction of the Elmicatherm 52409tape. Thanks to an increase in the weight ratio of mica-containing paper in the tape of up to 50%, higher valuesof long-term Electric strength for the frame insulationare achieved, as is a reduction in the labor-output ratioduring the manufacturing of bars and coils due to adecrease in the number of insulation layers, which isimportant under the conditions of market economies. 1 is a registered trademark of the JSC Elinar Holding Company.

5 Modern Electric Insulating Materials for the insulation Systems of rotating Electric Machines A. V. Papkov, A. P. Mel nichenko, V. M. Pak, and I. E. Kuimov Abstract Modern insulation systems of turbo- and hydrogenerators, large Electric machines, and tractionmotors based on new Electric Insulating Materials (EIMs) produced by the JSC Elinar Holding Company (ElinarHC) are described briefly. The technical characteristics of some new EIMs are given. Key words : Electric Insulating Materials , insulation systems, turbogenerators, traction motors. DOI: 124 RUSSIAN electrical ENGINEERING Vol. 80 No. 3 2009 PAPKOV et al. For the same purpose, a new modification of Elmi-catherm 52409 tape has been developed with an accel-erated hardening (curing) time. Figure 1 shows thedependence of the soluble fraction of the binding agentunder thermal processing at a temperature of 160 C.

6 Anincrease in the hardening allows one to considerablydecrease the time of thermal pressing for the windinginsulation of Electric machines and, correspondingly, tosave the energy supply and increase the capability oftechnology requirements to the composition, as well asthe electrophysical and technological properties ofunimpregnated tapes for VPI technology, determine themaximal decrease in the thickness of a glass substratewhen the mechanical strength of a tape is kept at a cer-tain level and the maximal increase in the density ofmica-containing paper when high air permeability iskept. While tapes for VPI technology contain a smallamount of a processing binding agent, mica-contain-ing paper can fail (be damaged) easily by insulationactivities. Thus, to maintain the integrity of a micabarrier and to reduce the probability of damaging itwhen performing insulation procedures, the adhesionstrength of mica-containing paper should be at a a great extent, the type of accelerator of polymer-ization used in a tape increases the long-term electricstrength and reduces dielectric losses and other electro-physical characteristics of the insulation , as it is anaccelerator that determines the rate and degree of hard-ening of a binding agent in polymerizing after windingimpregnation is completed.

7 With a focus on this, activ-ities conducted by the JSC Elinar HC in conjunctionwith leading Electric machine-building enterpriseshave resulted in the modernization of well-knownunimpregnated tapes, such as LSKN-160TT, LSKN-135 SPl, and LSKO-180T, as well as the developmentof a new class of unimpregnated tapes under the trade-mark of Elmicapor. The new tapes have the two fol-lowing unchallengeable advantages over traditionalunimpregnated tapes: A new catalytic system maintains the specifiedamount of accelerator (a catalyst) in a tape after all pro-cessing operations are completed, which in turn ensuresthe full hardening of a compound after impregnationand, thus, ensures that high thermophysical and dielec-tric characteristics are achieved in the insulation sys-tem. The modernization of the production processingof mica-containing papers and unimpregnated tapesensures high processing characteristics, the absence ofdelamination, and the separation of mica particlesunder both mechanized and manual insulation main physical and mechanical characteristics ofunimpregnated tapes produced under the trademarkElmicapor are cited in Table 2.

8 The broad nomenclatureof tapes in terms of both thickness and compositionopens wide possibilities for developers of new modernelectric machines. Table 1. Technical characteristics of Elmicather tapeParameterElmicather 55 409 Elmicather 52 409 Thickness, density, g/mm 2 195 21220 30195 21250 26298 31 Specific breaking (failure) load, N/c>150>150>150>150>150 Dielectric loss tangent:M (15 35 C) 45 75%< < (155 C) < 20%< < agent flow in tape, %40 70 Bending rigidity, N/m<25<40<40<60<80 insulation classFFFFF 2520151050min10080604020% Fig. 1. Dependence of the soluble binding agent (%) ontime of thermal processing (min) 1 . serial tape; 2 . tape with accelerated curing time. RUSSIAN electrical ENGINEERING Vol. 80 No. 3 2009 Modern Electric Insulating MATERIALS125 Table 2.

9 Main characteristics of unimpregnated Elmicapor tapeParameter52311952319953319 Nominal thickness, density, kg/m 2 130 12140 14146 15205 15194 15 Breaking (failure) load under expansion, N/cm>80>130>160>130>80 Weight fraction (ratio), mg/m 2 360 80360 80360 80420 120420 120 Breaking-down voltage, kV> > > > > , N/m<45< 50<45<60<60 AnalogNoLSKN-135 SPlLSKN-160 TTLSKO-180 TNo Table 3. Main characteristics of conducting tapesParameterLPP-200 LPP-400 LPP-400 KLPS-5000 Type of substratePolyester-thread fibersGlass fabric Nominal thickness, deviation from nominal thickness, mm density, g/m 2 110 1080 1086 10115 35 Specific breakdown load under expansion in longi-tudinal direction552020 Percent of elongation under fracture (crack), %, no less than121515 Surface resistance, 200 100400 100400 1505 10 2 1 10 4 Surface resistance of tape after impregnation in compound PK-11, , no more than 5 10 5 Table 4.

10 Main characteristics of boxes of a rotor lotParameterKPT-R(F)KPT-R(H)KPTB-R(F) KPTB-R(H)KPPT-C(F)semiconductingBreaking strength under binding perpendicular to layers, MPa, no less thanat temperature 23 C280280250250250at temperature (180 5) C 112 100 Electric resistance perpendicular to layers at temperature of 23 C in transformer (dielectric) oil, kV/mm, no less than12122020 Specific Electric resistance, cm:perpendicularly to layer1 10 3 1 10 6 parallel to layers1 10 1 1 10 3 Resistance to short-term heat, C, no less than200250200250180 Heat resistance classFHFH F 126 RUSSIAN electrical ENGINEERING Vol. 80 No. 3 2009 PAPKOV et al. JSC Elinar HC has presented a line of products thatincludes tapes of the following marks: LPP-200 andLPP-400 for the antidischarge protection of the wind-ings of high-voltage motors and turbo- and hydrogener-ators, LPP-400K and LPS-5000 for the antidischargeprotection of slots, and semiconducting polyester tapeof the LPP-1000 mark for the external antidischargeprotection of the ending main technical characteristics of conductingtapes are cited in Table the antidischarge protection of the ending wind-ings, an LPP-1000 tape with nonlinear volt currentcharacteristics is suggested.