ML19276H117
| ML19276H117 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 11/11/1968 |
| From: | Mannal C KNOLLS ATOMIC POWER LABORATORY |
| To: | |
| Shared Package | |
| ML19276H110 | List: |
| References | |
| KAPL-P-1164, NUDOCS 7910100520 | |
| Download: ML19276H117 (14) | |
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%+ j' klfl!FYM82.30 PDMR WBGN?03V SCHENECTADY, NEW YORK u z.. - - - . - - _
_ . _ _ - , . _ ... a I
TESTING ELECTRICAL INSULATION
,' # j. g),
FOR USE IN GAMMA-RAY FIELDS
}.
C. Mannal m_ ._ m_ - -
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OPERA?HD FOR TME 3.8. AT0010 EDEDGV C003l88!.00 DY YME BEMEDAL ILECT3!C 000!PA]Y .- - - - - . - . . - - . -
Technical Librar, 1Ai5 i9I Knolls Iteric Forcr hberatory -
P.O. Be :, 1072 Schenectady, 'e: Yo:k 123C2.
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reprinicdflorr. hae 1932. Vok'e 12. N . t. fo5ts A -33 Cepyrish? 1932. M.cGro - HD Td!. Cc . lac-333 West 42r.d 5t., New Yori 36. New York P00RBRMI.
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FIG.1 ,
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Ele,_ctromagnetic pump for
,se s, . p, ,coomn,,,,,e. -
x
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-l-SSt.inOJdeCrrlCal i f'Or slSe in ,amma-}say cie .s ___ ..
e I Submarine Intermediate Reactor's coolant p' ump will be subjected to gamma-rays from sodium. Tests of voltage breal:down, mechanical properties, and gas evolutien of irradiated samples indicate that a silicone-resin impregnated mica and glass tape insulation will be satisfactory up to 10 r if it is not in a sealed container L
By CLIFFORD MANNAL
- Knolls Atomic Poncer Laboratory
- Schenectady, Xew York 3
l} - ^ ^ ~ E!.ECTRICA!, Inst *!.ATioN used in the coolant circuit (I-E) laminated ma;- for an appreciable time. Thus it is Submarine Intermediate Resetor's pri- netic structures just above and below important to preserve and predict msry-coolant pump will be subjected a 1-in.-high, 24-in.-thick duet in the insulation life.
- - ~ ~
to gamma r:idiation from the liquid- pump are energized to move the sodium Experience with m' and ;!ss sodiurn coolant. Thu=. development by the interaction between the meg- ha shown that the, pouca ex-has required study of the efTects of netic field and a large current that cellent radiation-resis' tant qualities. high-energy gamma radiation on clee- flous across the duet. Althouqh , the hi;h-te:npere.ture re-trical insulation. This article reviews insulation. Becau-c the .< odium be- quirement dict'ato an inid!ation .it:uc-the impor tant f.ndin;<. cornes therraa"y brt and inter,=cly tme with a< litth' or;.'r.! n.. teri..' 9, e . Pump. Fi;ure ! < hows the c!cetio- radioactive.durin; its pa aa;c thinugh pv-<ible, some o:ganic binder mu-t I,e magnetic pump that ui!! circulate the re: etur, the stator's in ulation is added to provide neces<ary tw chanie.u liquid sodium in the reactor's piimary subjecte.1 hoth to high tempeinture and properties. It appeared that a ili-intenac gamrna rarliation. Pump re- canc-re,inr ba-ed varnish would be the
- operated by the Cencrat D.ctri- Co. Pl aecment will he di!Iieult and costly ruoat likely candidate for this applica-for the L*. S. .\tornie I:nergy Coniniinian, onec the reactor ha< heen in operation tion. Thu<, the major portion of Vol.12, No. 6 - June,1954 49
P00RORGNAL study han been on either gh-s and mies irradi.ition is fairly justified. Aslon; Lolted in pbce. The entire asseinb!y structures impregt:ated with miliconc as the clectrons appear in the material was phecd over the Co* source and resin, or on silicane resih films aloue. with a given energy, it is not tuo im. the winding encigized to obtain normal portant how they got thcic or how they ma;netic vibratory forces and copper Sources received thcir energy. temperaturcs. Table I shows the radiation sources Neutron-D ommo e quivclence. Prc- Voltage-breakdown samphs, con-used for these expciliuents. In the lindnary experiments indicated that sistin; of narrovr bars of ghss.ekth SIR, thchulation will be subjected to a combined neutron and gamma fux landnate impregnated with silicone prirnary gammas of 2.70 3Iev and 1.3S is much more destructive than the resin, wee wound with nickel foil and Alev. Fast neutrons will be present gamma fux alone. This caused reae- covered with a few hps of mica. tape at an intemity 10,000 times lower than tot irradir.tions to be of linVted utility insubtion usin; SR-32 resin as a the photo:i flux. Although it was for these tests, binder. A number of these specimens desirable to subject the test specimens were pheed in the center of the Co" to an identical fiux, rio such sourec is Dos,imetry pit in a gas. tight aluminum container. available. Thus the dif!icult pqblem Accurate high* level dosimetry was These were periodically removed and of extrapohtion between quite dis- needc'd to determine neeumuhted doses. an external aluminum foil elect: ode similar sources was faced. Further, because much of the insub- wrapped around the outermost insub-Role eficct. It is customary to as- tion was (and will be) wrapped around tion. Voltage applied between this sume that the significant parameter is copper and surrounded by iron, it was and the central foil was used to break the total energy absorbed by the mate- desirable to determine the actual dose down the insulation. rial as rucasured by the integrated received by the insubtion in situ. Abrasion bars were pieces of M-in. dose (7). For small total desages and A ferrous.ferrie sulphate solution square alunVuum approximately 4 in. for low rates, this seems true in many dosimeter was used most. PVC dye- lon; on which mies bid on ghes. tape cases. Ifowever, the equivalence of impregnated films (S) were extremely insuhtion was applied. a dose delivered at a very high rate to convenient for measurements very Thin resin sheets (10-30 mik thick) the same total dose delivered at, say, near the conductor bars: A scintilla- also were tested. They were made by one-thousandth of this rate has des- tion counter also was used (9). casting and curing resin ~~~Elms on nitely not been proved. There is evi- metal phtes. __#- dence that measurably different re. Somples , == sults can be obtained. However, this Irradiations 4 vere conducted on four
' ' ' 'Ch study assumes the equivalence of equal kinds of samples: a facsimile stator, The quantity of primary interest was doses independent of the rate of voltage-breakdown samples, abrasion the ability of the insuhtion to with-accumuhtion. bars and resin Elms. stand applied voltage after a hrge Beto-g omma equivalence. Since Fi;ure 2 shows the d~sassembled accumuhted radiation dese. Fi.,ure the primary effect of electroma;netic stator con:tructed with a nindin; that 3 shows the results of such a test.
radiation of the energies under con- simuhtes the insuhtion of the electro- Unitradiated samples failed at break-sideration is to produce Compton magnetic pump. For assembly, the down voltages between G.6 and 10.7 recoil electrons in the material, a direct stator was slid into an annuhr con- kilovolts. This ran;e defines the nor-equivalence betwecn beta.and gamma tainer and a w:.ierti;ht cover was m.1 range of variability of the samples. On the basis of three samples broken down after 2.4 X 10'-r/hr irradiation, TABLE l-Source Chorocteristics no reduction in voltage breakdown was detected up to 1.2 X 102' r. This Optinum Approximer, Ambient indicates that the insuhtion will be Source sample si:e dose rate Normal Changes satisfactory for the SIR pump. The liberation of brge numbers _of_ _ GE Res. Lab. $2 in. dia., 10' r/hr (A)* 20' C air possible electrons by gamma absorption con-extern. beam 0 040 n. thick ceivably could provide initiators for an Evahnehe process. Breakdown then Oak Ridge 6 in, long, 10'r/h S 20' C air difficult would occur at lower applied Selds reactor 3M in. sq. or 1018 n/cm'/ sect 2 in. dia. (f0-12). Figure 4 shows 60-eyele, Brookhaven 6 in. lon;, 5 X 10' r/hr (t) 160-150' C difficult short-time voltage breakdown on For-reactor 3M in. sq. or 5 X 1018 n/cm8/ sect air mex-insuhted wire (Formex used for 2 in. dia. experimental convenience) at room HEM
- disch. 8 in. long, 1-2 X 10' r/br: 20' C water practical temperature. The fact that voltage fuel elem. IM in. dia. breakdown for irradiated specimens was 5tT11 disch. 10 in. long,- S X 10'r/br 20' C water practical substantially the same as that for spee-fuel elem. (5) 3 m, . sq.
KAPL 3,000.e G m. lon:, imens not under irradiation indicates 2 X 10'r/Lri 20' C water practical Co souree (6, I M m. dia.,or tht helibtb b n m-annuhr volume 0.5 X 10'r/hr minor eficet for the case of interest. A further experiment to shed some
*0.5-%!ev and 1.17 3fev.
peak sinusoid.
- t Tiu:en spectrum.
- Tinion-product spectrum. ] 1.33 light on this proccis was carned out usin; the external electron bcam 50 June,1954 NUCLEO!4KS 1415 193
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i '~i t FIG. 3. Short. time breckdow.n vo!!cge os fun: tion of oceimuteted radi: tion
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dose for gloss bocked rnico tape impregnoted with SR.32 resin
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8 I , , , . . . . 8 2 3 4 5 6 7 8 9 to it 12 13 I Applied Voltc;e (103v2fts)
-. .J FIG. 2. Test stator whose winding simv. FIG.4. Short time. 60.cytte breakdown voltage on irradiated and unirradiated lotes cIectromogneti: pu anp stator Formex insvtoted wire of 20' C -
6 - GE 8:132 s.h:oes resin., 1*150p omp
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Accumuleted 4* Dese (10 roenta-n) FIG. 3. Current possing through resin f!!ms os function of occumutored radiction dose facilit3. .Two thin films of resin were silicone-resin curve is broken because tive nature, this technique was not contained between very thin outer a sceand sample of different thickness fruitful for the resins of major interest aluminum foils. As shown in Fig. 5, a was used. at this time. central foil was maintained at a posi- These results were corroborated by tive potential and the current flow from measurements on the stator windings. Mechanical Properties the central foil to ground measured on Resistance and power factor measure- The mechanical properties of insu-a microammeter. A certain number ments o unitradiated insulation and lation are next in importance to the of the incident electrons terminated on on the stator after 6 X 10' r are within electrical properties. The evaluation the central foil and thus produced a the normal range add setually show a of which mechanical properties are static current in the circuit and de- sli;ht improvement after irradiation. necessary, and to what de; tee, is a creased the total sensitivity of the This is undoubtedly due to the evolu- question that has never been settled on experiment. If the insulation had tion of water and solvent vapors an~d a quantitative basis. changed from an essentially non- to additional polymerization. An empirical method .of evaluatin; conductin; to a conductin; state under Although power factor mensme- comparable kinds of insulation is pro-the influence of the radiation field, ments have been used extensively to vided by an " abrasion tester." (f.l-f C). there would have been an increase determine changes in molecular strue- The total nudiber of turni required fcr in current as irradiation continue.!- ture (13), our exten4 Ivc measurements a strikin; and rubbin; mstion to cause Such an inercase. was nc.t ob-crved, from low audio frertuenaies to the failure p a measure of the abrasion re-and it was concluded that the specilie megacyc!: range on thin films of re-in sistanec of the insulation. Figure G resi<tivity of the material dial not in various sta;cs of irradiation showed gives result < of tc<ts on speelt;. ens
~
undergo a catastrophie decrease for no con =Istent variations. In spite of irradiated in the Oak Ridge and Brek-irradiations up to 2 X 10'r. The_. its caec of apptiration an.1 toon<lectrue- haven reactgrs ge r oneln-Vol.12, No. 6 - June,1951 51
~ ' P00R ORGINAL TABLE 2-Sumir. cry of Gas Evolution from Vcrious Semples sions are that racchanie.d pigpaties cf silicone-re In-ant!-nuca-tape insuht,on i Sa ,,,pt, are not paiticul.uly alicetcd by 30. day-irradiation at 100-150' C, but 00-day Di 1cetric l- . irradiation at thi< temperatu:e peatly
. Quantity 1,realdo:ca Cable coil Stator reduces mechanical stren;th.
It is generally felt that insubtion Resia wt. tgm) .
. - 10 4 $9 should withstand thousands of turns before failure and any that nittstand Added hest cure before irradiation . None None
- 24 days; 140* C only a few hundred turns will not be Comparison with pump .
sa etory. p QniGestee d h 1 sinding Similar Very diH. Nearly Went. of abras,on resistance as relates to [* i of the insubt, ion ofice the Insubiton Radiation frorn Co" HEW slugs Co" has been installed will depend to a very Irradiation (equiv. avg. large degree on the individual piece of pump days)- 170 400 63 equipment. Quipment in which in-Irrad. temp. ('C) 25 25 45 subtion has reached a condition that
*ould give a very low abr:.sion.ie-Total gas evolved (em8) 54 8.7 982 sistance measurement esa give long Gas Iaetor (em'/leq. 0.033 0.49 0.16 reliable serviec uoder severe conditions.
'I 8"I) Thus, this chan;;c in abrasion (-sistance Gas retention by insul. Ould not be interpreted in terms of structure High Negligible Moderate proportions 1 decrease in insuhtien life.
Gas analysis (Cl!. - 1) The be_havior of the phospheasbestos COs Trace 0.46 2.5 paper (shown as a range of values) is H. 1.23 None 4.4 extremely interesting. Thi= material, C.U. None None 1.1 Irtially poor, appsiently sufiers no Nylene 0.19 None None further sieterio' ration and in its final
*" * *EE*### E#
Mnjor u certainties D ee Mass spectrom. Corr. f r leak,
- ana!., rad. lever gassing by ton silicone resin and mig tape.
of cure , The entirely emptrica results of the gashin stato'r can ebrasion tester and the inab'!!!y of 2 device of this kind to evaluate the
" weak link" (i.e., the resin) in the in-TABLE 3-joses Evolved
- f,om impregnatedf Gloss Tcpe During Gommo subtion structure has led to an investi-Irrodiolion e gation now in pro;tess. It is be'.ieved R(%) CR.(G) X:or CO( T C.R.(G) that more useful informaticn can be derivedfromstudy of penett:t::ntin es Catalyzed Sind In Xs In rac. In X: Ir. roe. In rec. In X: In rac. of styliin thin films of resin i radiated by the external electron beam.
Yes Yes 49.5 38.9 39.3 40.6 2.7 11.0 15.9 ' Gas Evolution Tes .No $1.S 42.0 ' 41 3 41.S 2.0 6.9 12.1 Initially it was believed that con-No No 17.5 10.4 32.9 13.6 3.S 40.6 70.3 siderable insight into mechat. Isms of No Yes 15.9 10.7 30.4 19.1 4.9 53.6 65.3 decomposition could be obtained by
- Appro'simately 0.C em s can evolved per sm of resin, both in nitrogen and in recuo. study of components present in the Nitrogen pressure over amples scaled in N: = 15o mm. resin off-gas. Table 2 summarizes the t With 3.25 wt. % mine octoste estalyzed SR-32.
14 X 10' r accumulated dose from discharged MTR elements. first data obts.med. Two fsets were evident: 1, evolution of gas was of suffielent msguitude to esuse concern in a sealed container; 2, the " sign 2-TABLE 4-Gos Evolution from 10-8 mm Films of SR.32 During Pyrolysis ture of decomposition products wr.s Temp. Erotution rate , substantially different from one sample Time - ('C) (10-* liter / min) Composition . to the next. Niile some small difier-enees in tiegree avere anticipated, the 15 min 90 0.5 Methyl trimer, tetramethylsilane differences in kind that were observed and low mol. wt. silanes seemed beyond any reasonab'e limit. 30 min 95 A systematic approach to the prob-40 min 135 0.25 95G C.II.,4G H:0, In trimer lem waa taken by attempting to i4chte 70 br . 135 0.0012 05 G C.H., 4 G trime' significant variable.- as shown in Table 3 hr 150 C.H.,11-0, cyclie trimer, tetramers
- 3. One of the pic4umed variab!es is 16 hr 220 ' 50G C.H. the estalyst, in th.is case about 3M g - - 20n hexamethyltricyclo.<Ilane weight % of zine octoste ad led duri: g
s4 "uc'tosics 1415 19 5 s
$2
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'40% j g--------Unirred;:: :, ht:t c;c: 23 c:;,s. f CO-ISO'C .
/ e' /-- -- --!O c 3s et ID r ny, i o S x $ i ,,.,, J fe,.,2/ st:,25* C 4, coo 2.' -[ i f --30 coys et to'? nv,0 5x10'? It.'evT/cmfge:,isg.igo*; r
/ -C0 con et 10t2 n ,o Sxio:2 f t.'ev T/ cm 2/se:,tEO.tCO* C
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l r3n' F i li i i i r-I r 1 i I im - I l 1 I l!!iliiiil llliii!ll 1 I I I I i 1 40 - l 1 10 GE Siip2 s hcor e o'n GE 3552 rnico tcpe Phosphcostestes p:;te GE 35sZ tr.ico to e . FIG. 6. Efiect of radiatica on obrosion resistance of B.rnit thick insdelion tcpes finalformulation of the resin to " body" process is substantially different than Driermut Asd suptes t.-ess"J cecams sofactory procedura: r. Flyn n c r.d K.1tc:Hs
.it. As the res!.na;es,th.is zine octeate ,that which the resin experiences in
,,,,,3,,,y ,, ,,,,,,,y, discus sier.: ecic' ca will break down providin; some frec . pyrolysis. Table 4 follows the decom- to proportes of com-arcint innt2tions: .4 .
sinc and octoie acid. Thus the com- position of an extremely thin film of Pletcait tost utodc<t daic rc!at r.; to ;wer facto
- and the penc raf:n of ved'!+si;st%he posit. ion of the resin was to some extent resin deposi ted on the ,ns,de t of a f.tma by means of ::sti; r. J. Icstos of a function of time,'ind it was espected quartz bulb (C,15). Extensive low- Gr's Resecrch Leb'ctws irrcJi2 cJ rain
. that the catalyst mi;ht be particularly temperature de;af sin; was undertaken 8 " ' '
vulnerable to di<integrat:on under ir- prior to the pyrolysis. The molecular ,[*((,,, Inciceeries f g',Q 'l["f,['.t t %rctory desioneand c, n-'""[',,'((j radiation. Another variable re'.ated to fragments obactred as a functi'n of stru:'el epipment C. S. Ro/menn sad I2. the sizin; shcady on the glass tape be- time and temperstme are entirely dif- ,7d N""c'm #'y cIp#d"o$' Y'e' ark"' fore impregnation with the resin. ferent from those observed as a con =e-
""UC'"^
- Examination of the data shows no quenee ofirradiation. It seems reason-substantial ditiere.nce between the sized abic to conclude th'a t the thermal and # #i di,C n. Jr E. E SchoA AECD403 and unsized samples. . In one instance, radiation degradation proce+ses are es- 2. 3. Barnsra. c. D. Comes. AECD4 MO (1951)
. J. J. F. C.:e. Jr AECt!.2252 ina) comp:.rison of the m.tro;en and vneuum sentially different in detail. 4 J. V. ScWu. E. J. Lawton. JdrOs 113. ris atmosphere results shows a disetepancy , ,, ,, y,,3U , R. Ituftmsn. Nectroxes 12, L. 4. 20 that seems to be considerably beyond osso t
experimental err'or; in n!! other cases TAis article is 6 Esc 4 on a rsper presented 8 f[5,JonasQs, ; ,Q s the a;reement between the'. nitro;cn atRidge th radieren d. F_ J. Heniv. A. 3Lucr. NecLeones t. No 6.
.Vationn! Dense Co fene,r.
Le%ratory.1 Dah, torch -,.1954. s: gtssu and va:uum atmosphere is good. it i, a pi,ance to acteouteds: lAe caist- s. w. w. scimm. v A. D..n. xce6 conc. : , There is a marked differenet between ance of aameras ass *eiates. 3. s. Jun so. s. 49 om>
.cas repusste for correctnas e dosimetry so. L onsed n. Loc >. B it). ArrL Ps u s. s.k.tt.
the catalyzed and uncatalyzed results. ,,,d for pronre,nnt and many of tAe de,,ir, m o'ne) These results were obtaine1 at a time of cat co a pit; II R.Jaf. I. L. .itir.cAer. 'd when the total gas pre +sure could not Genrest J IF Rva"-Ings.aa'l ',...F.ncrac!!,ofeqG.I. Q M gy".3 g,,,s 3, ,. M,, ,..*r N *$$b*i E
;,in c m ,- uot.n war
.a e
. nee sep La% a'ary, curse! ent ,,3 s n,. m. ys nn:,
be measured, and it .14 not potatb!r to many of LAe tc4's and prer 'cl a* t c*c'3mt 13. R. >L F.n .. /. A E Cer-i. St . 53. L *.0 tell whether the roult< difier bec.me s m , w: c. 70 ' , , , , , ? ?> c 50-;> -a: im o'. .n
' c: DNL n ii. N.?t.w M . L R U.' .;.2 %
- the percent.w.catur mt. . :e ...
tr. o_ ,f:.;,,L.,,:s,,, ' (_p_p,,,
.1t TI:. IV. P e
,ny;gg ,,,,,. n. g y. nuna,. 7,n, 27,5 ss, n_ u. ux whether tl.: catalped rcs[,:r.e , :>r m eitnp!y i,, e), ,,,5,.f f.p;f;ti. , et tAcir ,7u; p. ft. ,( g!. us t E. s.+- a P. wa r.
produce.= much snoir hydr.cn. KIoa * *a ec4 ta t'c em cac!:,'s p '!c=: n. t:. Lin.i.er. 7 eu. arpt ss, n.1.113
#- 3"'" Y " ' " "' " " "
Whatever the di!!crencers due to the smet corcs.hne P;l^'"dD. nna,yr:s: "ft.'"D arc noe. 2 0*) . 7. se .vt om: variations exhibited in Table 3 pe , n. Ico Jy of r;r s 5.,giri .:+t .1teJi.,m .11. tor is. .A. . . .::. trot (p m Vol.12, No. 6 JEne.1954 53
FAN DRIVE MOTOR for REACTOR CONTAI!2ENT BUILDING VENTIIATION & COOLING SYSTEM The proposed unit vill be a squirrel cage induction motor, totally-enclosed, vater-cooled, with torque and current characteristics typical of NEMA design B, suitable for driving a fan or blover. The specific horsepower, speed, voltage, and other characteristics for the particular application are listed at the end of this description. The construction is designed to keep the expected ambient atmosphere from contacting the bearings, vindings, rotor and other internal parts of the mocor during normal conditions, and during the accident conditions described with the specific motor rating. Exclusion of the ambient atmosphere vill be accomplished by a positive, pressurized, rubbing seal between the bearing housing and drive shaft. Enr.losure - Stator - Double shell, round frame construction, of heavy fabyfcated_ steel, _ _ . designed for cooling water to be circulated between inner and outer shell, in a helical pattern around the diameter. Inclosure - Drive end shield vill be fabricated of heavy steel. Opposite drive end shield vill be ccst of nodular iron. Shields vill be bolted to the stator frame tand a seal between the shields and stator vill be made by means of "O" rings at the rabbet fits. Stator Core and Windines - Punchings are stacked and clamped tc.gether securely,by a velded cage, prior to being inserted in the stator frase in the same canner as the typical ' Custom 8000 construction. (Described in more detail in standard publications) Windings are inserted in tne stator core, connected, braced and fully impres-nated before the core is installed in the stator frame. The inside diameter of the stator frame has machined slots running the length of the frame. The ribs of the cage used to clamp the punchings together extend outside the dia= ster of the punchings, and these ribs fit in the slots c u t in the stator frame. 1415 197 CENER AL h ELECTRIC
P00R ORGNAL Str. tor Core e.nd Uit:5in c (Cont'd) A po:;f tisc int;rference fit betrecn the ctr. tor frame and core ic obtained by heating the frc.: a before th: cor:, is inserted. Inceir. tion - Cines E r.r.tcrinis which have demenstre.ted, by prior, doc tented tecting, en v to retain t.c.ticfactory insulating propartier, after re.dir. Lion dorn;cc abilit'O of 101 ref.s nre used throughout the stator vindings. Bearinfj - Grchsc lubrice.ted, cntifriction bearin5s are used. Tne drive end hac n roller bearing. Tne oppocito d-ive end has a ball bearins. 'Ihc b-131 bcaring is de:1cn:d to take thrust loadin . Both bearinca have calculated lisc; in excesc of 100,000 hours. A special grence cuitable for the radiation cnd temp 2rature requirc:ents will be used. __ _ _ _ _ _ Rotor - Rotor punchings cre stsched and clamped tocether. Rotor barc and cr.d rings are rade of e.luminum which is cast in the rotor punchin;s. Tnic is described in core detsil in standard publications. Shaft Seal - The drive end shaft seal is a rubbing double seal unit using vator under a ~ pressure greater than the expected ambient pressure to r.aintain the seal. The only Iarts of the seal in cont Jt with the shaft are two 0-rings. The scal is desi6ned to allow enough axial move =ent of the shaft to accomodate shaft expnsion. _ _ _ _ _ _ . . _ _ _ _ _ _ . _ The seci vill be a " John Crane" DBL type 81 as canufactured by Cranc-Pac %ing - - Company, or equal. The seal design vill be tested for the precsure, ter.p r-ature humidity and chemical conditions which cre specified for poct-accident operation. 1415 198 CENERAL Q ELICTRIC
-s P00RDElkt Tereintl Connectort -
Terainc.1 connectors vill be ceramic insulated bushincc, similcr to sparh plu;3. 7hrended ctuds vill be provided for connection of usere tain po.rcr cLble cnd acccescry virin;. Conncetions for cecessories vill be brou;ht out at a different loce.tien from tain p=ter connections. No conduit boxes are furniched. Acccccories -
- 1. Temperature Detectors: Thernoccuples vill be mounted on the inside of the fraca to measure temperature.
- 2. Moisture Detectors: A moisture detector vill be mounted on the bottom of the frame to detect condencation buildup or seal leakage.
3 Space Heaters: Lov voltage sin 61 e phase space heaters vill be cupplied-- -- to caintain internal temperature slightly chove a~bient temperature during motor shutdown periods.
- h. Vibration Detector: A vibration switch vill be mounted on the motor to detect execssive vibration Separate electrical connections to this switch must be made at instal-lation since it is externally counted on the motor frame. Typical switch is Robertshav Vibracvitch or equal.
Test -
- 1. Seal Test: To be performed by seal manufacturer.
- 2. Standard Motor Tests:
- 1) Running light current
- 2) Resistance (stator)
- 3) 1 phase impedance at 1/4 voltage
- 4) Running light vatts
- 5) Hipot test
- 6) Cold insulation meggar
- 7) c'eserve undue noise
- 8) Air gap measurement i 15 i99 C E NIR AL () !LICTRIC
Page k Quality Control A co=plete quality control procedure in accordance with MIL-Q-935Sa and DECAS requirements is in effect in our factory. Additional procedure vill be set up as required for special features of these specific meters. 9 mm E.N.D. 11-11-6B 1415 200 GENER AL $ ELECTRIC
MOTOR DATA HP - 150/75 RM4 - 1200/600 Volts - 4k0 Service Factor - 1.0 Temp. Rice (by resist) 800C Space heater voltage - 115 Load WK2 - 3000 lb. ft2 Overhung load 1200 lb @ 8" Method of conn. to load - fan to be mounted on motor shaft Axial thrust capacity - 800 lbs. continuous, 3000 lbs. momentary Ambient conditions: Normal: 5000 50'P 15 psia Accident: 15000 100% 70 psia plus chemical solution spray Cooling water temp. - 35 C max. Cooling water pressure - 150 psig rax. Cooling water pressure - 70 psis design Bearings - Drive End - Roller - 222 opp. Drive End - Ball - 319 1415 201 G E NIR AL () E LICTRIC
Class H Insulatien for Nuclear Radiation Application Turn Insulation: Quadruple coated aremstic polymide (U.L) Ground Insulation: Wrapped or taped with a co=bination of =ica and glass. Coils are dipped and baked with a silicon resin varnish. Connections: Wrapped or taped with a conbination of mica and glass. Wedge & Filler Material: Sheet silicone glass cloth, staple fiberglass base. Coil Bracing Ring: (When required) Steel vrapped with a glass and mica silicone treated tape. Coil fie Material: Continuous filament glass cord treated with silicone resin varnish. Finish: The finished stator is given multiple dips in silicone resin varnish and baked after each dip. E.N.D. ! 11-15-63 1415 202 CIN ER AL () t LICTRIC
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STATOR CONSTRUCTION-PRE-WOUND CORES STATOR CUSTOM 8000* NiOTORS AND GENERATORS j
SUMMARY
Prc.scound stator cores increase the life expectancy and tion of the bonding agents. easily verified by in<pection and reliability of General Electric Custom 8000 maiors and test. produces a reliable machinc.
. generators. Improved quality is gained by the complete Rapid replacement or repair, should this become necessary, accessibility possibic during manufacturing. is an added advantage of premound core design.11any purchasers stock a core for back.up protection because the Simpffed scindiag combined scith the rugged core and design of the machine males replacement of cores easy scith a frame, rnore than adequate bracing, and thorough penetra. minimum of costly doscn time.
CONSTRUCTION High grade silicon stect carefully selected for lower ported rigid structure, contributes to longer machine electrical losses, is used for stator laminations. The life even m the most severe applications. laminathms are assembled on a mandrel between a top Pre. wound cores have lifting lugs permanentiv in. and bottom flange. While the assembly is held by a stalled. No special tools are required for hanilling. compressive force of more than 50 to-is, heavy lonGi . removing, or replacing the core in the frame. Actual tudinal strap 4 are welded to the end Ganges and form a experience shows that pre. wound cores can be replaced rugged cage for clamping the laminations. in leas than two hours. TESTS Space blocks separate sections of lamina ions to pro. vide a path for circulating cool ventilating air. The air Assembled cores are subjected to both static r.nd ducts correspond with'similar ducts in the rotor and dynamic tests. To assure rigidity, forces are applied in are strategically placed so that incoming cool air is dis. increrpents of 500 pounds. Deflection and stress measure. tributed evenly over the entire length of the wound men's taken along the entire length of the stack verify core. Uniformly cooled stators minimize hot spots and the ruggedness of the core structure. result in longer insulation life. Drop tests are also used. Here, the sample core is first dropped horizontally, then on end, and then at an angle Cores are completely wound be.'are they are inserted so that the core strikes the surface at 45 degrees. These into the frames. Free access tc the windings permits use tests show that the core used in General Dectric machines of the optimum bracing system and perm,ts i complete can take impact loads without distorting the stack. Cores visual inspection of manufacturing operations. This built to prevent dimensional instability virtually elimi. wound-core a55emi,1), impregnated to form a fully sup- nate abrading of the insulated winding from this cause. P00R 00MS5m s *hY. 9m
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- m ROTORS-FOUR OR MORE PO!.ES '
ncrrcm CUSTOM 8000* E;-8200 FRAMES _. / z -
SUMMARY
General Electric induction motor rotors arc designed to nonced casting techniques and rnodern equipment combine meet the exactin to produce a uniform high quality rotor. Simphpd con. peripheral sp cds,g electricrequirements pulsations, and thermal of starting con. duty, struction, high a minimum number of parts, and continuous tractions and expansions during normal operation. .fd. quality assurance audits contribute to reliable performance. CONSTRUCTION Simplified construction, a key factor in reliable rotor squirrel cage to the air stream. Closed slot construction performance, requires a design with minimum numbers of in the rotor reduces noise by presenting a smooth un. parts and materials. In the Custom 8000 design, one. broken surface. piece punchir.gs' eliminate the conventional spider and The fmished rotor structure is shrunk on a high. carbon thereby eliminate fits ,and tolerances between the spider steel shaft which is sized to withstand the stresses. Fin. and the rotor laminations. The result is a rigid stack of ally, each rotor is machined and dynamically balanced. punclungs that reduces vibration problems caused by differential thermal expansions. REl. LABILITY ASSUP.ANCE The punching has large air passages to distribute air To maintain the uniformly high quality of Custom throughout the rotor assembly to cool the entire core 8000 rotors, materials are constantly subjected to in. structure uniformly. Radial, air ducts channel the cool coming quality assurance audit, and both materials and air through the otor punehmg assembly and around the fmished products are subjected to exhaustive tests. squirrel. cage bars. The rotor ducts are abgned with stator ducts so that the rotor acts as a centrifugal blower, forv Each rotor is dynamically balanced ing air through the stator. to give vibration. free operation. g isBalancm, later verifiedprior to as
. when the assembled motor is tested.
Advanced castmg techm. ques and modern equipment combine to produce a uniform high. quality rotor squirrel Rotors of this construction were subjected both to cage. Molten aluminum is forced through closed slots raised temperature and overspeed tests up to 6000 rpm in the rotor punchings to form the solid, one. piece which tested punchings, end rings, fans, and balance winding. The special casting techniques prevent voids, weights to three times normal operational forces. thus assuring windings of high conductivity and excep. Tests were conducted not only on the materials and tional mechanical strength. The use of aluminum rotors individually, but also on the complete motor throughout results in a lighter. weight rotor with lower assemblies. Subjection to more than 50.010 plugced stress concentration under centrifugal force. reversals under carefully controlled laboratory p'ro-Integrally cast fans on the squirrel. cage end ring pro. cedures produced no rotor damage, no movement of vide efficient air circulation and conduct heat from the the punchings, or disturbance of machine balance.
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