LAPP Insulator Post Catalog

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STATION POST INSULATORS• Design Features 2• Design Applications – Station Post Units - 95 kV BIL thru 750 kV BIL 5 – Station Post Stacks - 900 kV BIL thru 2050 kV BIL 6

Flashover and Withstand Values 7RG® Insulators: Semi-Conductive Glaze 8

• RG® Part Number Conversion Table 9Single-Piece Station Post Units

• 95 kV BIL 10• 110 kV BIL 11• 150 kV BIL 12• 200 kV BIL 13• 250 kV BIL 14• 350 kV BIL 15• 550 kV BIL 16• 650 kV BIL 17• 750 kV BIL 18

Multiple-Unit Station Post Stacks• 900 kV BIL 19• 1050 kV BIL 20• 1300 kV BIL 21• 1470 kV BIL 22• 1550 kV BIL 23• 1800 kV BIL 24• 2050 kV BIL 25

Cap and Pin Replacement Insulators 26• Cap and Pin Selection Chart 28

Switch Operating Rod Insulators 30Electrostatic Rain Deflectors, Transition Plates, and Spacers 31Part Number Conversion Table - Cavity Core to Solid Core 32Numerical Index Inside Back Cover

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The station post is an original Lappdesign. It was introduced in 1931 toprovide the electric power industry withswitch and bus insulators havingsuperior operating characteristics plusthe strength and long life required forreliable substation operation. Today,after nearly sixty-five years of service onthousands of installations, Lapp stationposts offer station design engineersmaximum economy and trouble-freeservice in a wide variety of voltage andstrength ratings.

All Lapp station post insulators meetANSI leakage requirements. We alsooffer high leakage (“ H” ) and extra-highleakage (“ E” ) versions of these standardcatalog items.

To meet actual requirements of intendedservice as closely as possible, Lapp hasdeveloped station post insulators inmany strength classes. Included inthese are standard, high strength, andextra-high strength station posts.Products are available in ratings from 95kV BIL through 2050 kV BIL foroperating voltages 7.5 kV thru 1100 kV.

Design Features

� HardwareAll Lapp station posts have externallyattached caps and/or bases. A provencementing system transfers the loaduniformly from the hardware into theporcelain body.

� Porcelain BodyEach insulator body is made from thehighest quality clay raw materials thathave been processed to be fully vitrifiedporcelain. The body is glazed to addstrength, improve surface appearance,and enhance ease of cleaning.

� Uniform Leakage PathLapp’s petticoat profile designs provideoptimum leakage distance. Sheds arespaced to take advantage of the naturalcleaning action of wind and rain and toavoid concentrated hot spots where localstress can cause flashover. Thisprovides the optimum leakage surface.

� Short, sturdy shedsThe porcelain sheds protect the bodyfrom impact or flashover. They willwithstand severe mechanical attack.Even when broken, station post shedsbreak clean, usually leaving the bodyundamaged and the insulator stillserviceable.

� “Straight-line” flashoverLine terminals are separated by the fulllength of the insulator so that flashovergoes outside the unit. Loss of one ormore sheds does not significantly reduceflashover distance.

� Standard bolt circlesLapp station post caps and bases havebolt holes on standard bolt circles forinterchangeability and ease of mounting.The minimum depth of all tapped holeson the end caps is equal to the diameterof the hole. Adapter plates and spacersfor changing mounting hole diametersare available (see page 31).

Lapp station posts manufactured to IECstandards are available. See Catalog11C.

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Minimum deflectionLapp station posts provide maximumstiffness in a switch and bus insulatordesign, an important feature in tallerstacks for higher voltages. Station poststacks for high voltage and EHV aremade up of single-piece porcelain withexternally attached hardware boltedtogether in a strong, rigid assembly.

Same strength invertedAlso available are Lapp station poststhat have the same cantilever strengthmounted upright or inverted. Whetherthey’re mounted obliquely orhorizontally, the station posts’ superiorelectrical and mechanical characteristicsprovide a safe margin of operatingsecurity.

Economical EHV assembliesTapered station post stacks made up ofmixed units of different diameters andstrength ratings are lighter in weight thanuniform-diameter assemblies and offerconsiderable economy. Electrical andcantilever characteristics are equivalentto uniform-diameter station posts.

Electrostatic rain deflectorThe wet flashover characteristics of thetaller station post stacks are improvedby placing metal rain deflectors (U.S.Patent No. 2884479) between each ofthe sections. The deflectors use theelectrostatic field surrounding theinsulator to disperse falling rainwaterand prevent flooding of the lowersections.

Total testingSolid core station post insulators aregiven a routine mechanical proof test ofeither four-way cantilever (upright andinverted) or equal bending moment,depending on the voltage class. Cavitycore station posts receive an electricaltest in accordance with ANSI C29.9-1983 Section 7.4.1 before assembly ofhardware. After assembly each cavitycore unit is tested mechanically to 50%of rated tension strength.

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Remarkable service recordLapp station posts have compiled aremarkable service record since theywere introduced nearly sixty-five yearsago. Today, Lapp station posts are inservice on all major systems in theUnited States, Canada and in manyother countries around the world.These years of operating experience,together with trim good looks, reliablelow-maintenance operation, greaterstiffness, and superior electrical andmechanical characteristics make Lappstation posts ideal insulators formodern switch and bus applications.

Station post reliabilityWhen designers specify Lapp stationpost insulators, they do so with theconfidence that they will receiveproducts that are backed by a longhistory of low-maintenance service in awide variety of demanding systemapplications.

Resistance to power arcoverThe sturdy sheds on the porcelaincolumn of the station post insulatorkeep power arcs away from the bodyand protect it from damage. If the arcis sufficiently severe to break awaysheds, it is not unusual to find only thetop or bottom shed damaged with themiddle sheds left intact. Even in theimprobable instance that all sheds arestripped off, the arcover distance of theinsulator will not be decreasedmaterially.

Freedom from radio-TVinterferenceLapp station posts are low capacitanceinsulators by design. Thischaracteristic enables Lapp stationposts to meet the Radio InfluenceVoltage requirements established inANSI C29.9.

Modern appearanceUtility companies have learned thatattractive substations constitute animportant part of good public relations.The use of Lapp station posts willenhance the appearance of substationsat all voltage levels. Their trim,modern design harmonizes well withother apparatus and equipment in thearea.

Mechanical damageJust as the sheds protect the body ofthe insulator from the effects of powerarcover, they also protect it againstmechanical damage from stones andbullets. Generally, stones thrown atthese insulators on structures ofmoderate height will do little or nodamage. A bullet or stone striking ashed with sufficient energy will breakthe shed but leave the insulator bodyintact. Of course, any damagedinsulator should be inspected to verifyintegrity of the insulator.

Mechanical loadingLapp station posts are available invarious ratings to allow switchdesigners to specify insulators to meettheir particular loading requirements.Lapp recognizes that switch insulatorassemblies bear combined mechanicalloads caused by the switchingoperations. These forces may includetension, torsion, compression, andcantilever loading. There may also beimpact loads of significant magnitude.Under impact loading the intensity ofthe load is the important characteristic.On Lapp station posts, the areas ofload transfer to the porcelain aregenerous, so no high-intensity pointloading occurs.The inherent strength and rigidity ofLapp station posts are the result ofcareful design, the limited number ofmechanical joints and their rugged,externally mounted hardware. Thegreat strength and rigidity of Lappstation post insulators make themparticularly well adapted for use on tallhigh voltage and EHV stacks whereswitch and bus alignment andoperation are critical.Lapp post designs have low naturalfrequency and high dampingcoefficient. These features areimportant considerations when seismiccriteria are a part of the substationdesign parameters.

Petticoat ProfilesThe cross-section shown in Figure 1 is our conventional shed profile and will be supplied on most standard catalog items. Thecross-section shown in Figure 2, our major/minor shed profile, will be supplied on some standard catalog items and is generallyused on high leakage designs. The cross-section shown in Figure 3, our major/double minor shed profile, will be supplied onsome standard catalog items and is generally used on extra-high leakage designs.

Figure 1 Figure 2 Figure 3

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Design ApplicationsSTANDARD STRENGTH UNITSStandard strength station posts arerecommended for all normal dutyswitch and bus applications. Theseunits have the same cantilever strengthrating mounted upright or underhung.They meet or exceed all ANSIStandards in electrical or mechanicalcharacteristics for their class.

HIGH STRENGTH UNITSHigh strength station post insulatorsprovide an extra margin of mechanicalstrength for heavy-duty switch and busapplications. In addition, they matchthe standard strength station posts inall electrical characteristics. Highstrength station posts are usuallyrequired where mechanical loads fromopening and closing switches areunusually heavy or where there is athreat of severe short circuit stresseson the insulator. Also these unitspermit longer, heavier bus runs withfewer insulators. A neater, morecompact substation design whileretaining the reliability and low-maintenance characteristics of all Lappstation posts insulators.

High strength station posts simplifyeconomical upgrading of existingstructures for heavier current loads.

EXTRA-HIGH STRENGTH UNITSExtra-High strength station posts areavailable for switches subject to heavymechanical loads. They’re also usefulfor long or heavily loaded bus runs insubstations where severe short circuitstresses could damage insulators withlower ratings.

Lapp extra-high strength station postshave all of the rugged good looks andelectrical characteristics of the lowerstrength station posts insulators.

SpecificationsThe IEEE standard for maximumrecommended working load of Lappstation post insulators is 40% ofpublished cantilever rating, 50% ofpublished torsion rating, and 50% ofpublished tension rating. For shortcircuit loads only, the maximumrecommended working load is 100% ofpublished ratings when using formulasfrom ANSI C37-1972.

Gray glaze is standard on all stationpost insulators. Chocolate glaze isavailable by deleting “ -70” from thecatalog number.

Caps and flanges are made of dropforged steel, malleable iron or ductileiron, and hot-dip galvanized. Tappedholes are Unified National CoarseThread Series, 1/2-13, 5/8-11 and 3/4-10. Holes are tapped .015” oversize toallow for the use of galvanized capscrews.

Leakage distance shown indimensional data conforms to ANSIminimum requirements. To designateincreased leakage of up to 40% morethan ANSI standards (High Leakage),an “ H” suffix is added to the catalognumber; example 315286H-70. Todesignate increased leakage greaterthan 40% more than ANSI standards(Extra-High Leakage), an “ E” suffix isadded to the catalog number, example315286E-70.

Station posts manufactured to IECstandards are available. See LappCatalog 11C. For more informationcontact Lapp Insulator or your localLapp representative.

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Design ApplicationsSTATION POST STACKS FOR HIGH VOLTAGE, EHVAND UHVLapp station post insulators are well-suited to highvoltage and EHV switch and bus constructionbecause of their strength, rigidity and adaptability to awide range of stack heights and BIL ratings.

Match industry BIL ratingsSince industry practices vary widely in the choice ofinsulator levels in the design of EHV substations,Lapp station posts for the higher voltages areidentified by Basic Impulse Insulation Level (BIL),rather than by voltage class.

The most popular BIL designations based on the kVcrest value to withstand voltage of a 1.2 x 50microsecond full wave impulse voltage are listedhere. Lapp EHV station post insulators are availablefor all of these BIL ratings.

Industry Approved Basic ImpulseInsulation Levels (BIL), kV

900 1300 1550 20501050 1470 1800 2300

Freedom from radio-TV interferenceLapp EHV station posts are low capacitanceinsulators and they are inherently free from radio andtelevision interference. By design the hardware isseparated by the full height of the porcelain, thusraising the voltage at which corona starts. EveryLapp station post meets Radio Influence Voltagesestablished in ANSI C29.9. This is particularlyimportant on tall stacking insulators for operation atEHV and UHV voltage levels.

Corona shields are available for EHV station postswhere service conditions make extra shieldingnecessary.

Electrostatic rain deflectorsAny type of tall insulator is susceptible to bridging aswater flows down and accumulates on the lowersections. The Lapp Electrostatic Rain Deflector(Patent No. 2884479) uses the electrostatic fieldsurrounding the insulator to disperse the falling waterand eliminate bridging. In addition, these deflectorscomplement the Lapp leakage surface design of theinsulator.Electrostatic Rain Deflectors are supplied on allstation posts rated 1300 kV BIL and above. They canbe ordered for lower voltage units if desired (see page31).

Minimum deflection under cantilever loadingLapp station posts provide maximum stiffness, afeature of increasing importance as seismic criteriabecome a part of substation design.

Economy of tapered stacksAlthough both uniform-diameter and taperedstation posts are available for all EHV and UHVapplications, it is usually more economical to usetapered stacks for BIL ratings above 1470 kV.

Tapered station post stacks are made up ofmixed sections of different diameters andstrength ratings. They are electrically equivalentto and provide the same bending strengths asuniform-diameter station posts but are lighter inweight and less expensive. Tension, torsion, andcompression values are set by the smallestdiameter section and will be less than the valuesof uniform-diameter stacks.

For example, a typical 3-unit, 1800 kV BILtapered stack consists of one 10.62” diameterlower section, one 9.62” diameter center sectionand one 9.25” diameter top unit. This assemblyis comparable in electrical characteristics to auniform-diameter stack composed of three10.62” sections. BIL rating and height are thesame for both insulators, but the tapered stationposts is lighter in weight. The result is lowerinsulator costs, plus savings in handling anderecting costs.

SpecificationsThe IEEE standard for maximum recommendedworking load for Lapp station post insulators is40% of published cantilever rating, 50% ofpublished torsion rating, and 50% of publishedtension rating. For short circuit loads only, themaximum recommended working load is 100% ofpublished ratings when using formulas from ANSIC37-1972.Gray glaze is standard on all station postinsulators. Chocolate glaze is available bydeleting “ -70” from the catalog number.Caps and flanges are made of drop forged steel,malleable iron or ductile iron, and hot-dipgalvanized. Tapped holes are Unified NationalCoarse Thread Series, 1/2” -13, 5/8” -11, and3/4” -10. Holes are tapped .015” oversize toallow for the use of galvanized cap screws.Leakage distance shown in dimensional dataconforms to ANSI minimum requirements. Todesignate increased leakage of up to 40% morethan ANSI standards (High Leakage), an “ H”suffix is added to the catalog number; example315308H-70. To designate increased leakagegreater than 40% more than ANSI standards(Extra-High Leakage), an “ E” suffix is added tothe catalog number, example 315308E-70.Station posts manufactured to IEC standards areavailable, see Lapp Catalog 11C. For moreinformation contact Lapp Insulator or your localLapp representative.

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American National Standards no longer require testing for thefollowing electrical values. This table is intended as a reference forthose who wish to use its data.

Summary of Switching Surge Withstands and Switching Surge Critical Flashoversof 900 kV BIL to 3300 kV BIL Lapp Station Post Insulators†

The flashover withstand values are the average of many tests on the same or an equivalent testspecimen. Because they are averages of test values read directly from a test curve with none ofthe safety factors commonly associated with catalog values having been applied, they should notbe considered as ratings.

AVERAGE FLASHOVER VALUES WITHSTAND VALUESCritical Power

Power Frequency Impulse Frequency

BIL Dry, kV Wet, kV Negative, kV Dry, kV

95 60 40 120 35110 85 55 200 50150 110 75 250 70200 145 100 290 95250 170 125 340 120350 235 180 475 175550 385 285 780 280650 435 335 900 335750 485 380 1020 385900 575 475 1240 4651050 660 570 1450 5451300 745 660 1650 6101470 830 740 1850 6801550 865 780 1950 7101800 990 900 2240 8102050 1100 990 2600 940

Reference: ANSI C29.9 - 1983, Appendix B.

Insulator DRY WETBIL Height Positive, kV Negative, kV Positive, kV Negative, kV

inches WS CFO WS CFO WS CFO WS CFO900 80 745 825 985 1210 690 770 830 9351050 92 855 955 1115 1380 805 900 945 10501300 106 980 1105 1260 1565 935 1045 1025 11801550 128 1145 1285 1445 1825 1105 1275 1210 13501800 152 1280 1460 1590 2050 1255 1450 1340 14602050 182 1410 1600 1720 2250 1390 1595 1435 16102425 210 1620 1845 1950 2460 1630 1770 1590 18002675 240 1750 2010 2120 2620 1790 1920 1710 19503050 270 1870 2140 *2280 *2760 1920 2060 1825 21003300 300 1950 2240 *2420 *2900 2000 2200 1930 2250

* Extrapolated values Wave shape: 200 x 4000 microseconds†Tested with Base 24' above ground using 4" IPS Bus.

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RG Insulators Employ a UniqueSemi-Conductive Glaze WhichInhibits Arcing and Flashover.Since they were first installed in the1970’s, Lapp RG insulators have builtan enviable operating record incontaminated areas where no standardinsulator can perform. That’s becauseRG insulators make use of a uniquesemi-conducting glaze which effectivelyinhibits arcing and flashover.

Whether the contamination problem isthe result of coastal salt fog or mist,industrial pollution, agricultural dust orchemicals, the tens of thousands ofRG insulators already in service haveprovided excellent performance forutilities around the world.

RG Insulators Can SignificantlyReduce Construction andOperating CostsThey Reduce the Need to Over-InsulateOver-insulation may reduce thenumber of flashovers in contaminatedareas, but its effectiveness is nevercertain. In addition, larger insulatorsmay require larger structures, whichcan lead to higher costs.

When you choose RG insulators, youdon’t need to over-insulate. In fact,RG insulators hold voltage inenvironments that caused flashover onregular insulators having two to threetimes the leakage distance.

That’s what we call performance.They Reduce the Need forWashingWashing can cost utilities hundreds ofthousands of dollars a year; a costwhich RG insulators eliminate.

They Reduce EMI ProblemsAssociated With InsulatorsThe outstanding performance of RGinsulators reduces both radio noise andTV interference. In fact, at operatingvoltage, RIV on RG insulators remainsat near zero under most conditions ofsurface contamination.They Reduce the Need forGreasing or CoatingPeriodically applying silicone grease orRTV coating to insulators incontaminated areas is another costlymaintenance procedure which RGinsulators eliminate.

The Glaze on RG Insulators is aPermanent, Integral Part of theInsulatorUnlike protective coatings which areapplied after an insulator is glazed, thesemi-conductive glaze on RGinsulators is a permanent, integral partof the insulator.

Because the glaze is applied as part ofthe normal manufacturing process, RGinsulators are less costly thaninsulators which are first glazed with aregular glaze and then covered with ahydrophobic coating.

900 kV BIL Resistance Graded Station Posts at Hamilton Beach T.S.

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RG Insulators Gain TheirSuperior Performance FromThree Factors:1. Linear Voltage DistributionVoltage drop across the entire lengthof the RG insulator surface is uniformso that all parts of the insulator areevenly stressed.

2. Heating EffectThe small current flow over theelectrically equivalent resistor createdon the surface of an RG insulatorwarms the surface to a few degreesabove the ambient temperature. Thisdiscourages moisture accumulation,and moisture is usually necessary tomake contaminants conductive.

3. Reduction of Dry BandArcingDry bands form on RG insulators withuneven wetting and drying, just asthey do on regular insulators.However, RG insulators provide aconductive shunt path across the drybands, preventing any visiblescintillations or arcing. The result?There are no local arcs that can growinto full length flashover.

They’re Backed By Years ofField ExperienceCommercially available since 1970,RG insulators have been used in abroad range of applications, frommoderate to extremely severecontamination. This experience putsLapp in a position which no othermanufacturer can match when itcomes to helping you meet thecontamination demands of yourapplication.

It has also shown us ways in which toimprove our product designs. AllLapp’s latest RG insulatorsdemonstrate our commitment toproviding the most comprehensiveand up-to-date product designsavailable.

Want to Know More?We reccommend consulting Lappdirectly when considering theinstallation of Resistance GradedStation Posts (RG®). For more detailsand technical assistance, write toLapp or contact your Lapprepresentative.

RGRG® Resistance Graded Station Posts Resistance Graded Station Postsand Equivalent Regular Glaze Station Postsand Equivalent Regular Glaze Station Posts

Regular RG Glaze Equivalent Regular RG Glaze EquivalentBIL Glaze Previous Current BIL Glaze Previous Current95 315202-70 500001 535202 900 315126-70 535126

315041-70 535041 317126-70 500176 537126315222-70 500011 535222 319126-70 539126318490-70 500021 500021 315175-70 500095 535175

110 315205-70 500002 535205 317175-70 537175317004-70 537004 319175-70 539175315044-70 535044 315304-70 500030 535304317044-70 537044 315304-70 500079 535304315225-70 500012 535225 315308-70 500031 535308318451-70 500022 500195 315308-70 500033 535308

150 315007-70 535007 315308-70 500076 535308317007-70 537007 314925-70 500034 500194317010-70 537010 314161-70 500032 500181315046-70 535046 1050 315128-70 535128317046-70 537046 317128-70 537128315208-70 500003 535208 319128-70 539128315227-70 500013 535227 315176-70 535176318453-70 500023 500196 317176-70 537176

200 315010-70 535010 319176-70 539176315049-70 535049 315312-70 500040 535312315210-70 500004 535210 315312-70 500080 535312315231-70 500014 535231 315316-70 500041 535316318455-70 500024 500197 315362-70 500042 535362

210 319140-70 539140 315362-70 500045 535362319139-70 539139 1300 315324-70 500051 535324

250 315013-70 535013 315324-70 500086 535324317013-70 537013 315367-70 500054 535367315053-70 535053 315367-70 500088 535367317053-70 537053 315368-70 500052 535368315214-70 500005 535214 315368-70 500087 535368315267-70 500015 535267 315369-70 500055 535369318459-70 500082 500198 315369-70 500089 535369

350 315016-70 535016 1470 315330-70 500061 535330317016-70 537016 315330-70 500063 535330315056-70 535056 315371-70 500091 535371317056-70 537056 315373-70 500065 535373319056-70 539056 315372-70 500062 535372314970-70 500199 1550 314732-70 500073 500203314982-70 500200 315379-70 500074 535379315216-70 500006 535216 318059-70 500092 500204315278-70 500016 535278 1800 315391-70 500083 535391318461-70 500081 500201 315391-70 500118 535391

550 315019-70 535019 314914-70 500084 500188317019-70 537019 314914-70 500119 500188319019-70 539019 314934-70 500085 500189315173-70 535173 314934-70 500120 500189317173-70 537173 2050 314867-70 500093 500205319173-70 539173 314867-70 500122 500205315286-70 500007 535286 318032-70 500094 500206315287-70 500017 535287 318032-70 500123 500206318457-70 500027 500027

650 315288-70 500008 535288315289-70 500018 535289314857-70 500028 500202

750 315025-70 535025317025-70 537025319025-70 539025315174-70 535174317174-70 537174319174-70 539174

315291PA-70 500009 500009PA315295PA-70 500019 500019PA318441PA-70 500029 500029PA

* For Maximum recommended working loads see “ Specifications,” page 5.Note: For RG glazed insulators equivalent to these standard insulators, see table on page 9.Illustrations shown are true representations of Lapp products at the time of printing, but are subject to change at any time.10 ALL DIMENSIONS ARE IN INCHES

Ø 7.0Ø 7.0

7.507.50

4 TAPPED HOLES4 TAPPED HOLES1/2-13 +.015 OVERSIZE1/2-13 +.015 OVERSIZE

5/85/8" FULL THREADFULL THREADON 3.0ON 3.0" BOLT CIRCLEBOLT CIRCLE

Ø 4.25Ø 4.25

Ø 4.25Ø 4.25

STANDARD STRENGTH UNIT

Ø 7.50Ø 7.50

Ø 6.12Ø 6.12

Ø 6.12Ø 6.12

10.010.0


3/43/4" FULL THREAD FULL THREADON 5.0ON 5.0" BOLT CIRCLE BOLT CIRCLE

HIGH STRENGTH UNIT

Ø 6.12Ø 6.12

Ø 10.0Ø 10.0

Ø 6.12Ø 6.12

Ø 10.0Ø 10.0



EXTRA-HIGH STRENGTH UNIT

CHARACTERISTICSLapp Catalog Number 315202-70 315222-70 318490-70Ansi Technical Reference Number T.R.202 T.R.222Dimensions

Leakage Distance, Inches 10.5 10.5 10.5Mechanical Values *

Cantilever Strength, Upright, Pounds 2000 4000 8000Cantilever Strength, Underhung, Pounds 2000 4000 8000Tensile Strength, Pounds 7000 15000 28000Torsion Strength, Inch-Pounds 6000 12000 40000Compression Strength, Pounds 10000 20000 40000

Electrical ValuesVoltage Class, kV 7.5 7.5 7.5Impulse Flashover, Positive, kV 105 105 105Low Frequency Withstand, 10 Sec. Wet, kV 30 30 30Impulse Withstand, kV 95 95 95

Radio Influence Voltage DataTest Voltage, Rms to Ground, kV 5 5 5Maximum RIV, Microvolts at 1000 kHz 50 50 50

WeightNet Weight, Each, Pounds 14 32 46

315202-70315202-70 315222-70315222-70 318490-70318490-70

* For Maximum recommended working loads see “ Specifications,” page 5.Note: For RG glazed insulators equivalent to these standard insulators, see table on page 9.Illustrations shown are true representations of Lapp products at the time of printing, but are subject to change at any time. 11ALL DIMENSIONS ARE IN INCHES

Ø 7.0Ø 7.0

Ø 4.25Ø 4.25

10.010.0


5/85/8" FULL THREADFULL THREADON 3.0ON 3.0" BOLT CIRCLE BOLT CIRCLE


Ø 4.25Ø 4.25

Ø 8.50Ø 8.50

Ø 6.25Ø 6.25

Ø 6.25Ø 6.25

12.012.0



HIGH STRENGTH UNIT

Ø 10.0Ø 10.0

Ø 6.12Ø 6.12

Ø 6.12Ø 6.12

12.012.0





Leakage Distance, Inches 15.5 15.5 17Mechanical Values *


Electrical ValuesVoltage Class, kV 15 15 15Impulse Flashover, Positive, kV 125 125 125Low Frequency Withstand, 10 Sec. Wet, kV 45 45 45Impulse Withstand, kV 110 110 110



315205-70315205-70 318451-70318451-70315225-70315225-70


Ø 4.25Ø 4.25

Ø 4.25Ø 4.25

14.014.0

Ø 7.0Ø 7.0




Ø 9.0Ø 9.0

Ø 6.25Ø 6.25

15.015.0

Ø 6.25Ø 6.25



HIGH STRENGTH UNIT

15.015.0

Ø 11.38Ø 11.38

Ø 6.25Ø 6.25

Ø 6.25Ø 6.25





Leakage Distance, Inches 24 24 24Mechanical Values *





315208-70315208-70 315227-70315227-70 318453-70318453-70


Ø 4.25Ø 4.25

Ø 4.25Ø 4.25

Ø 7.50Ø 7.50

18.018.0




20.020.0

Ø 9.0Ø 9.0

Ø 6.25Ø 6.25

Ø 6.25Ø 6.25



HIGH STRENGTH UNIT

20.020.0

Ø 11.50Ø 11.50

Ø 6.25Ø 6.25

Ø 6.25Ø 6.25







Electrical ValuesVoltage Class, kV 34.5 34.5 34.5Impulse Flashover, Positive, kV 225 225 225Low Frequency Withstand, 10 Sec. Wet, kV 80 80 80Impulse Withstand, kV 200 200 200



315210-70315210-70 315231-70315231-70 318455-70318455-70


22.022.0

Ø 4.25Ø 4.25

Ø 4.25Ø 4.25

Ø 7.84Ø 7.84




Ø 6.25Ø 6.25

Ø 10.0Ø 10.0

Ø 6.25Ø 6.25

24.024.0



HIGH STRENGTH UNIT

25.025.0

Ø 10.81Ø 10.81

Ø 8.38Ø 8.38

Ø 8.38Ø 8.38










315214-70315214-70 315267-70315267-70 318459-70318459-70


Ø 4.25Ø 4.25

Ø 4.25Ø 4.25

30.030.0

Ø 7.84Ø 7.84




Ø 6.12Ø 6.12

Ø 6.12Ø 6.12

Ø 30.0Ø 30.0

Ø 10.50Ø 10.50



HIGH STRENGTH UNIT

32.032.0

Ø 12.88Ø 12.88

Ø 8.38Ø 8.38

Ø 8.38Ø 8.38










315216-70315216-70 315278-70315278-70 318461-70318461-70


Ø 6.12Ø 6.12

Ø 9.31Ø 9.31

Ø 6.12Ø 6.12

45.045.0




Ø 6.25Ø 6.25

Ø 6.25Ø 6.25

Ø 10.50Ø 10.50

45.045.0



HIGH STRENGTH UNIT

Ø 10.50Ø 10.50

Ø 8.38Ø 8.38

Ø 8.38Ø 8.38

48.048.0










315286-70315286-70 315287-70315287-70 318457-70318457-70


Ø 6.12Ø 6.12

Ø 6.12Ø 6.12

Ø 9.69Ø 9.69

54.054.0




Ø 6.25Ø 6.25

Ø 6.25Ø 6.25

Ø 10.50Ø 10.50

54.054.0



HIGH STRENGTH UNIT

Ø 8.38Ø 8.38

Ø 10.50Ø 10.50

Ø 8.38Ø 8.38

54.054.0










315288-70315288-70 315289-70315289-70 314857-70314857-70


Ø 6.25Ø 6.25

Ø 6.25Ø 6.25

Ø 11.62Ø 11.62

62.062.0




Ø 6.25Ø 6.25

Ø 6.25Ø 6.25

Ø 11.62Ø 11.62

62.062.0



HIGH STRENGTH UNIT

Ø 8.38Ø 8.38

Ø 8.38Ø 8.38

Ø 10.62Ø 10.62

62.062.0




CHARACTERISTICSLapp Catalog Number 315291PA-70 315295PA-70 318441PA-70Ansi Technical Reference Number T.R.291 T.R.295Dimensions






315291-PA-70315291-PA-70 315295-PA-70315295-PA-70 318441-PA-70318441-PA-70


Ø 9.50Ø 9.50TYPTYP

Ø 6.12Ø 6.12

Ø 6.12Ø 6.12

40.040.0

40.040.0

80.080.0



STANDARD STRENGTH UNIT HIGH STRENGTH UNIT


Ø 6.25Ø 6.25

Ø 6.25Ø 6.25

40.040.0

40.040.0

80.080.0



Ø 10.50Ø 10.50

Ø 9.75Ø 9.75

Ø 8.38Ø 8.38

Ø 6.25Ø 6.25

40.040.0

40.040.0

80.080.0






Ø 8.38Ø 8.38

Ø 8.38Ø 8.38

40.040.0

40.040.0

80.080.0



CHARACTERISTICSLapp Catalog Number 315304-70 315308-70 314925-70 314161-70Ansi Technical Reference Number T.R.304 T.R.308Dimensions

Leakage Distance, Inches 165 165 165 164Mechanical Values *

Cantilever Strength, Pounds 950 1450 2450 2750Tensile Strength, Pounds 20000 25000 20000 40000Torsion Strength, Inch-Pounds 40000 90000 60000 120000Compression Strength, Pounds 60000 75000 60000 100000

Electrical ValuesImpulse Flashover, Positive, kV 1010 1010 1010 1010Low Frequency Withstand, 10 Sec. Wet, kV 385 385 385 385Impulse Withstand, kV 900 900 900 900

Radio Influence Voltage DataTest Voltage, Rms to Ground, kV 146 146 146 146Maximum RIV, Microvolts at 1000 kHz 500 500 500 500

WeightNet Weight, Each, Pounds 307 371 417 490

EXTRA-HIGH STRENGTH UNITS

315304-70315304-70 315308-70315308-70 314925-70314925-70 314161-70314161-70


Ø 6.12Ø 6.12

Ø 9.84Ø 9.84

46.046.0

46.046.0

Ø 6.12Ø 6.12

92.092.0




Ø 10.50Ø 10.50

46.046.0

46.046.0

Ø 6.25Ø 6.25

Ø 6.25Ø 6.25

92.092.0



HIGH STRENGTH UNIT

46.046.0

46.046.0

Ø 10.84Ø 10.84

Ø 8.38Ø 8.38

Ø 8.38Ø 8.38

92.092.0




CHARACTERISTICSLapp Catalog Number 315312-70 315316-70 315362-70Ansi Technical Reference Number T.R.312 T.R.316 T.R.362Dimensions


Cantilever Strength, Pounds 800 1250 2300Tensile Strength, Pounds 20000 25000 40000Torsion Strength, Inch-Pounds 40000 90000 120000Compression Strength, Pounds 60000 75000 100000

Electrical ValuesImpulse Flashover, Positive, kV 1210 1210 1210Low Frequency Withstand, 10 Sec. Wet, kV 455 455 455Impulse Withstand, kV 1050 1050 1050



315312-70315312-70 315316-70315316-70 315362-70315362-70


53.053.0

53.053.0

Ø 6.12Ø 6.12


Ø 6.12Ø 6.12

106.0106.0




53.053.0

53.053.0

Ø 8.50Ø 8.50

Ø 6.12Ø 6.12

Ø 9.44Ø 9.44

Ø 9.56Ø 9.56

106.0106.0



HIGH STRENGTH UNIT4 TAPPED HOLES4 TAPPED HOLES

5/8-11 +.015 OVERSIZE5/8-11 +.015 OVERSIZE11/1611/16" FULL THREADFULL THREAD

ON 5.0ON 5.0" BOLT CIRCLEBOLT CIRCLE

53.053.0

53.053.0

Ø 8.38Ø 8.38


Ø 8.38Ø 8.38

106.0106.0



53.053.0

53.053.0

Ø 6.12Ø 6.12

Ø 9.06Ø 9.06

Ø 10.31Ø 10.31

Ø 8.38Ø 8.38

106.0106.0





CHARACTERISTICSLapp Catalog Number 315324-70 315367-70 315368-70 315369-70Ansi Technical Reference Number T.R.324 T.R.367 T.R.368 T.R.369Dimensions







315324-70315324-70 315367-70315367-70 315368-70315368-70 315369-70315369-70


Ø 6.12Ø 6.12

Ø 6.12Ø 6.12


41.041.0

40.040.0

41.041.0

122.0122.0




Ø 6.25Ø 6.25

Ø 8.56Ø 8.56

Ø 8.81Ø 8.81

Ø 10.06Ø 10.06

Ø 8.50Ø 8.50

41.041.0

40.040.0

41.041.0

122.0122.0






Ø 6.12Ø 6.12

Ø 9.31Ø 9.31

Ø 9.44Ø 9.44

Ø 10.19Ø 10.19

Ø 8.38Ø 8.38

41.041.0

40.040.0

41.041.0

122.0122.0





41.041.0

Ø 8.38Ø 8.38


Ø 8.38Ø 8.38

40.040.0

41.041.0

122.0122.0



CHARACTERISTICSLapp Catalog Number 315330-70 315371-70 315373-70 315372-70Ansi Technical Reference Number T.R.330 T.R.371 T.R.373 T.R.372Dimensions







315330-70315330-70 315371-70315371-70 315373-70315373-70 315372-70315372-70


Ø 6.25Ø 6.25

Ø 10.12Ø 10.12

Ø 10.25Ø 10.25

Ø 11.06Ø 11.06

Ø 8.38Ø 8.38

43.043.0

42.042.0

43.043.0

128.0128.0






Ø 6.25Ø 6.25

Ø 10.12Ø 10.12

Ø 11.25Ø 11.25

Ø 11.56Ø 11.56

Ø 8.38Ø 8.38

43.043.0

42.042.0

43.043.0

128.0128.0





ON 5.0ON 5.0" BOLT CIRCLEBOLT CIRCLEØ 6.25Ø 6.25

Ø 10.50Ø 10.50

Ø 11.0Ø 11.0

Ø 11.50Ø 11.50

Ø 15.50Ø 15.50

43.043.0

.88.88

42.042.0

43.043.0

128.0128.0

4 HOLES Ø .81 ON4 HOLES Ø .81 ON14.0" BOLT CIRCLE14.0" BOLT CIRCLE

EXTRA-HIGH STRENGTH UNIT4 TAPPED HOLES4 TAPPED HOLES



CHARACTERISTICSLapp Catalog Number 314732-70 315379-70 318059-70Ansi Technical Reference Number T.R.379Dimensions






314732-70314732-70 315379-70315379-70 318059-70318059-70


Ø 8.38Ø 8.38

Ø 6.12Ø 6.12

Ø 9.62Ø 9.62

Ø 9.75Ø 9.75

Ø 10.62Ø 10.62

51.051.0

50.050.0

51.051.0

152.0152.0

4 TAPPED HOLES4 TAPPED HOLES 3/4-10 +.015 OVERSIZE 3/4-10 +.015 OVERSIZE

.88 FULL THREAD.88 FULL THREADON 7.0" BOLT CIRCLEON 7.0" BOLT CIRCLE

STANDARD STRENGTH UNIT4 TAPPED HOLES4 TAPPED HOLES

5/8-11 +.015 OVERSIZE5/8-11 +.015 OVERSIZE11/16" FULL THREAD11/16" FULL THREAD

ON 5.0" BOLT CIRCLEON 5.0" BOLT CIRCLE

.88.88

Ø 6.25Ø 6.25

Ø 9.88Ø 9.88

Ø 11.0Ø 11.0

Ø 11.12Ø 11.12

Ø 15.50Ø 15.50

51.051.0

51.051.0

50.050.0

152.0152.0





.88.88

Ø 6.25Ø 6.25

Ø 11.0Ø 11.0

Ø 11.25Ø 11.25

Ø 12.06Ø 12.06

Ø 15.50Ø 15.50

51.051.0

50.050.0

51.051.0

152.0152.0


EXTRA-HIGH STRENGTH UNIT4 TAPPED HOLES4 TAPPED HOLES



CHARACTERISTICSLapp Catalog Number 315391-70 314914-70 314934-70Ansi Technical Reference Number T.R.391Dimensions






315391-70315391-70 314914-70314914-70 314934-70314934-70


Ø 9.12Ø 9.12

Ø 9.38Ø 9.38

Ø 10.0Ø 10.0

Ø 10.62Ø 10.62

Ø 8.38Ø 8.38

46.046.0

45.045.0

45.045.0

46.046.0

Ø 6.12Ø 6.12

182.0182.0


7/8" FULL THREAD7/8" FULL THREADON 7.0" BOLT CIRCLEON 7.0" BOLT CIRCLE

STANDARD STRENGTH UNIT4 TAPPED HOLES4 TAPPED HOLES



.62.62

Ø 6.25Ø 6.25

Ø 10.75Ø 10.75

Ø 11.12Ø 11.12

Ø 11.88Ø 11.88

Ø 12.0Ø 12.0

Ø 15.50Ø 15.50

46.046.0

46.046.0

46.046.0

47.047.0

185.0185.0


HIGH STRENGTH UNIT


3/4" FULL THREAD3/4" FULL THREADON 5.0" BOLT CIRCLEON 5.0" BOLT CIRCLE

CHARACTERISTICSLapp Catalog Number 314867-70 318032-70Ansi Technical Reference NumberDimensions

Leakage Distance, Inches 432 432Mechanical Values *

Cantilever Strength, Pounds 1200 2000Tensile Strength, Pounds 20000 20000Torsion Strength, Inch-Pounds 60000 60000Compression Strength, Pounds 60000 60000

Electrical ValuesImpulse Flashover, Positive, kV 2370 2250Low Frequency Withstand, 10 Sec. Wet, kV 830 830Impulse Withstand, kV 2050 2050

WeightNet Weight, Each, Pounds 858 1223

314867-70314867-70 318032-70318032-70

26

Lapp has been meeting the needs ofelectric utilities for over 80 years. Thestation post was a Lapp first, back in1931. Today, Lapp continues to be atthe forefront of insulator design withworld class research facilities andengineering capabilities. The LappCap and Pin Replacement Post offerselectric utilities a direct replacement forcap and pin insulators, featuring all thecharacteristics required for reliablesubstation operation.

Design AdvantagesBoth cap and pin and station postinsulators have been used for manyyears in substations. While the twoproducts serve the same task, theirdesigns are markedly different. Longterm experience with both designs hasshown that there are generic designdeficiencies of the cap and pin that canalmost certainly lead to insulator failurein service. Large numbers of cap andpin failures have lead several NorthAmerican utilities to undertakereplacement programs in which stationposts are taking the place of cap andpin insulators. When comparing thetwo designs, the station post’sadvantages become evident and itsviability as a replacement for the capand pin becomes clear.

Porcelain has very high compressivestrength (80,000 psi), sixteen timesgreater than its tensile strength (5,000psi). Station Post insulators aredesigned to take advantage of thisinherent quality by avoiding conditionswhich place porcelain in tension. Capand pin insulators, on the other hand,can be subject to tensile forcesgenerated between two or moreporcelain shells from two possiblesources: “ growth” within the cementjoint, and thermal expansiondifferences.

“Growth” within the cement joint canbe a result of reactions between thecement and foreign chemicalsubstances, such as industrialcontaminants which may be in theservice environment of the insulator.As these reactions proceed, the jointswells or “ grows.” In designs such asthe cap and pin, which employ up tothree seperate internal joints, thisswelling generates bursting (tensile)forces on the porcelain shells,ultimately leading to cracking. If thecement is of poor quality and containsexcessive amounts of impurities suchas free calcium oxide or magnesiumoxide, reactions can occur within thecement itself which may lead to thistype of mechanical failure. The stationpost design uses only external cementjoints. Under conditions of “ growth,”external joints preclude thedevelopment of tensile stresses on theporcelain. Stresses are compressive innature, and thus load the porcelain inits strongest state.

CAP AND PIN INSULATORCAP AND PIN INSULATOR

CEMENTCEMENTJOINTJOINT








STATION POSTSTATION POST PEDESTAL POSTPEDESTAL POST STACKING POSTSTACKING POST

27

The station post design, tested bymore than 60 years of service, is muchsimpler than that of a correspondingcap and pin unit. Each station postsection employs a large, single piece ofporcelain in contrast to the cap and pinthat is composed of one to threeindividual porcelain shells nestedtogether and joined by cement. Thesimpler design and the use of fewercemented joints means that stationposts are more rigid and exhibit lessdeflection under load than do cap andpin insulators, an important feature inswitch applications.

SpecificationsThe maximum working load for Lappstation post insulators is 40% ofpublished cantilever rating, 50% ofpublished torsion rating, and 50% ofpublished tension rating. For shortcircuit loads only, the maximumrecommended working load is 100% ofpublished ratings when using formulasfrom ANSI C37-1972.

Light Gray glaze is standard on allinsulators. Chocolate glaze isavailable by deleting “ -70” from thecatalog number.

Caps and flanges are made of dropforged steel, malleable iron or ductileiron, and hot dip galvanized. Tappedholes are Unified National CoarseThread Series, 1/2” -13 and 5/8” -11.Holes are tapped .015” oversize toallow for the use of galvanized capscrews.

RG® Resistance Graded cap and pinreplacement insulators, employing aunique semi-conductive glaze thateffectively inhibits arcing and flashover,are also available. For more detailsand technical assistance, contact yourlocal Lapp representative.

115 kV Cap and Pin Replacements photo courtesy of Bonneville Power Administration

8Units supplied with cap screw packages consisting of hex head cap screws, finished hex nuts and lock washers (galvanized steel) for sectionassembly.Note: For RG glazed insulators equivalent to these standard insulators, see table on page 9.28

HH

HH

HH

PDPD

PDPD

MTGMTG

BCBC

MTGMTG

BCBC

PDPD

MTGMTG

BCBC

MTGMTG

BCBC

MTGMTG

BCBC

MTGMTG

BCBC

STATION POST REPLACEMENTSTechnical HH # Cantilever Strength Tension Torsion Compression ImpulseReference Height Catalog of Upright Underhung Strength Strength Strength FlashoverNumber in. Number Sections lb. lb. lb. in.-lb. lb. Positive - kV

1 7.5 315202-70 1 2000 2000 7000 6000 10000 10541 8.0 315041-70 1 4000 4000 10000 12000 20000 1054 10.0 315205-70 1 2000 2000 8500 7000 10000 125

44 10.0 315044-70 1 4000 4000 15000 14000 20000 1257 12.0 315007-70 1 2000 2000 5000 8000 10000 170

46 12.0 315046-70 1 4000 4000 20000 16000 20000 17010 15.0 315010-70 1 2000 2000 7000 10000 15000 22549 15.0 315049-70 1 4000 4000 20000 20000 30000 22513 18.0 315013-70 1 2000 2000 8000 12000 15000 28053 20.0 315053-70 1 4000 4000 15000 20000 30000 28016 29.0 315016-70 1 1500 1500 12000 15000 25000 39056 29.0 315056-70 1 3000 3000 25000 40000 60000 365

Special 29.0 314970-70 1 4500 4500 25000 90000 75000 39019 43.5 315019-70 1 1700 1700 20000 60000 60000 580

173 43.5 315173-70 1 2900 2900 25000 90000 90000 61025 58.0 315025-70 1 1200 1070 20000 40000 60000 810

174 58.0 315174-70 1 2000 1750 25000 90000 75000 810126 72.5 315126-70 8 2 910 910 20000 40000 60000 1010175 72.5 315175-70 8 2 1450 1450 25000 90000 75000 1010128 87.0 315128-70 8 2 750 700 20000 40000 60000 1210176 87.0 315176-70 8 2 1170 1100 25000 90000 75000 1210

PEDESTAL POST REPLACEMENTSTechnical HH # Cantilever Strength Tension Torsion Compression ImpulseReference Height Catalog of Upright Underhung Strength Strength Strength FlashoverNumber in. Number Sections lb. lb. lb. in.-lb. lb. Positive - kV

4 10.0 317004-70 1 2000 1000 5000 7000 10000 12544 10.0 317044-70 1 4000 3000 10000 14000 20000 1257 12.0 317007-70 1 2000 1000 5000 8000 10000 170

46 12.0 317046-70 1 4000 3000 10000 16000 20000 17010 15.0 317010-70 1 2000 1000 7000 10000 15000 22513 18.0 317013-70 1 2000 1000 8000 12000 15000 28053 20.0 317053-70 1 4000 2500 20000 40000 60000 28016 29.0 317016-70 1 1500 1000 12000 15000 25000 39056 29.0 317056-70 1 3000 2350 20000 40000 60000 41019 43.5 317019-70 1 1700 1470 20000 40000 60000 610

173 43.5 317173-70 1 2900 2350 20000 40000 60000 61025 58.0 317025-70 1 1700 1470 20000 40000 60000 780

174 58.0 317174-70 1 2000 1750 25000 90000 75000 810126 72.5 317126-70 8 2 910 840 20000 40000 60000 1010175 72.5 317175-70 8 2 1450 1350 25000 90000 75000 1010128 87.0 317128-70 8 2 750 700 20000 40000 60000 1210176 87.0 317176-70 8 2 1170 1100 25000 90000 75000 1210

STACKING POST REPLACEMENTSTechnical HH # Cantilever Strength Tension Torsion Compression ImpulseReference Height Catalog of Upright Underhung Strength Strength Strength FlashoverNumber in. Number Sections lb. lb. lb. in.-lb. lb. Positive - kV

140 14.5 319140-70 8 1 7000 4000 20000 40000 60000 235139 14.5 319139-70 8 1 10000 6000 25000 90000 75000 23556 29.0 319056-70 8 2 3000 2350 20000 40000 60000 410

Special 29.0 314982-70 8 2 4500 3500 20000 40000 60000 41019 43.5 319019-70 8 3 1700 1470 20000 40000 60000 610

173 43.5 319173-70 8 3 2900 2400 25000 90000 75000 61025 58.0 319025-70 8 4 1200 1070 20000 40000 60000 810

174 58.0 319174-70 8 4 2000 1750 25000 90000 75000 810126 72.5 319126-70 8 5 910 840 20000 40000 60000 1010175 72.5 319175-70 8 5 1450 1350 25000 90000 75000 1010128 87.0 319128-70 8 6 750 700 20000 40000 60000 1210176 87.0 319176-70 8 6 1170 1100 25000 90000 75000 1210

J Withstand ratings are predicated on the use of a subbase 3.50” high or its equivalent (see “ Spacers” on page 31).Note: The drawings shown are only illustrations and do not necessarily reflect the actual number of petticoats. 29

Low Frequency Impulse Test Voltage Maximum Leakage PDPD MTGMTG BCBC TOP BOTTOM TechnicalWithstand Withstand Rms to Ground RIV Distance Porcelain Ø Mtg.Surface Ø Bolt Circle Tap Minumim Tap Minimum Reference

10 Sec. Wet - kV (BIL) - kV kV µm at 1000kHz in. in. in. in. +.015 Thread +.015 Thread Number

30 95 5 50 10.5 7.0 4.25 3.0 1/2-13 0.62 1/2-13 0.62 130 95 5 50 10.0 9.50 6.12 5.0 5/8-11 0.69 5/8-11 0.69 4145 110 10 50 15.5 7.0 4.25 3.0 1/2-13 0.62 1/2-13 0.62 445 110 10 50 14.5 8.75 6.12 5.0 5/8-11 0.69 5/8-11 0.69 4460 150 15 100 20.0 8.0 4.25 3.0 1/2-13 0.62 1/2-13 0.62 760 150 15 100 24.0 10.50 6.25 5.0 5/8-11 0.75 5/8-11 0.75 4680 200 22 100 38.0 10.62 4.25 3.0 1/2-13 0.62 1/2-13 0.62 1080 200 22 100 35.0 10.75 6.25 5.0 5/8-11 0.75 5/8-11 0.75 49

100 250 30 200 50.0 11.0 4.25 3.0 1/2-13 0.62 1/2-13 0.62 13100 250 30 200 40.0 10.62 6.25 5.0 5/8-11 0.75 5/8-11 0.75 53145 350 44 200 52.0 7.84 4.25 3.0 1/2-13 0.62 1/2-13 0.62 16145 350 44 200 70.0 10.50 6.12 5.0 5/8-11 0.69 5/8-11 0.69 56145 350 44 200 72.0 12.0 6.25 5.0 5/8-11 0.75 5/8-11 0.75 Special230 550 73 200 99.0 10.50 6.25 5.0 5/8-11 0.75 5/8-11 0.75 19230 550 73 200 99.0 10.75 6.25 5.0 5/8-11 0.75 5/8-11 0.75 173315 750 103 500 132.0 9.38 6.12 5.0 5/8-11 0.69 5/8-11 0.69 25315 750 103 500 132.0 9.75 6.25 5.0 5/8-11 0.75 5/8-11 0.75 174385 900 125 500 165.0 9.62 6.12 5.0 5/8-11 0.69 5/8-11 0.69 126385 900 125 500 165.0 10.50 6.25 5.0 5/8-11 0.75 5/8-11 0.75 175455 1050 146 500 198.0 9.50 6.12 5.0 5/8-11 0.69 5/8-11 0.69 128455 1050 146 500 198.0 10.38 6.25 5.0 5/8-11 0.75 5/8-11 0.75 176

Low Frequency Impulse Test Voltage Maximum Leakage PDPD MTGMTG BCBC TOP BOTTOM TechnicalWithstand Withstand Rms to Ground RIV Distance Porcelain Ø Mtg.Surface Ø Bolt Circle Tap Minumim Slot Flange Reference

10 Sec. Wet - kV (BIL) - kV kV µm at 1000kHz in. in. in. in. +.015 Thread Width Thick Number

45 110 10 50 12.0 8.25 4.25 3.0 1/2-13 0.62 0.53 0.38 445 110 10 50 14.0 10.0 6.25 5.0 5/8-11 0.75 Ø .69 0.38 4460 150 15 100 20.0 10.0 4.25 3.0 1/2-13 0.62 0.53 0.38 760 150 15 100 18.0 12.0 6.25 5.0 5/8-11 0.69 Ø .69 0.38 4680 200 22 100 28.0 9.50 4.25 3.0 1/2-13 0.62 0.56 0.38 10

100 250 30 200 45.0 9.50 4.25 3.0 1/2-13 0.62 0.56 0.38 13100 250 30 200 37.0 11.12 6.12 5.0 5/8-11 0.69 0.69 0.50 53145 350 44 200 80.0 9.50 4.25 3.0 1/2-13 0.62 0.56 0.38 16160 350 44 200 70.0 11.12 6.12 5.0 5/8-11 0.69 0.69 0.50 56230 550 73 200 117.0 10.62 6.25 5.0 5/8-11 0.69 0.69 0.50 19230 550 73 200 99.0 10.50 6.12 5.0 5/8-11 0.69 0.69 0.50 173305 750 103 500 195.0 10.75 6.12 5.0 5/8-11 0.69 0.69 0.50 25305 750 103 500 195.0 10.75 6.12 5.0 5/8-11 0.69 0.69 0.50 174385 900 125 500 182.0 10.50 6.12 5.0 5/8-11 0.69 0.69 0.50 126385 900 125 500 165.0 11.38 6.25 5.0 5/8-11 0.75 0.69 0.50 175455 1050 146 500 198.0 10.25 6.12 5.0 5/8-11 0.69 0.69 0.50 128455 1050 146 500 198.0 11.25 6.25 5.0 5/8-11 0.75 0.69 0.50 176

Low Frequency Impulse Test Voltage Maximum Leakage PDPD MTGMTG BCBC TOP BOTTOM TechnicalWithstand Withstand Rms to Ground RIV Distance Porcelain Ø Mtg.Surface Ø Bolt Circle Tap Minumim Slot Flange Reference

10 Sec. Wet - kV (BIL) - kV kV µm at 1000kHz in. in. in. in. +.015 Thread Width Thick Number

75 210 22 100 33.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 14075 210 22 100 33.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 139

160 J 350 J 44 200 66.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 56160 J 350 J 44 200 66.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 Special230 J 550 J 73 200 99.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 19230 J 550 J 73 200 99.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 173315 J 750 J 103 500 132.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 25315 J 750 J 103 500 132.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 174385 J 900 J 125 500 165.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 126385 J 900 J 125 500 165.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 175455 J 1050 J 146 500 198.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 128455 J 1050 J 146 500 198.0 17.0 6.25 5.0 5/8-11 0.75 0.69 0.50 176

30

Switch operating rod insulators are essentially the same asstation posts, consisting of a single porcelain unit with aspecial cap cemented on each end. Their small diameter,strength and reliability provide an ideal method ofinsulating switch operating rods to protect personnel andequipment.

Insulators are glazed light gray No. 70 as standard.Chocolate brown glaze is available on request. To specifychocolate glaze, remove “ -70” from the catalog number.End hardware is ferrous, hot-dip galvanized.

1-1/4", 1-1/2" OR1-1/4", 1-1/2" OR2" I.P.S. PIPE2" I.P.S. PIPE

1/2" BOLT1/2" BOLTBOTH ENDSBOTH ENDS

Ø 6.0Ø 6.0

1.751.75TYPTYP

14.2514.25

.75.75TYPTYP

FOR BOLT ATTACHMENT TO PIPE

(4) 1/2" BOLTS(4) 1/2" BOLTSBOTH ENDSBOTH ENDS

1/2" SET SCREW1/2" SET SCREWBOTH ENDSBOTH ENDS

1-1/4" THRU1-1/4" THRU2" I.P.S. PIPE2" I.P.S. PIPE

Ø 6.0Ø 6.0

3.503.50TYPTYP

17.5017.50

FOR CLAMP ATTACHMENT TO PIPE

8138-708138-70Catalog number 8138-70 has two removable collars that fitinto sockets on the end caps. With collars, the insulator fits1-1/4” I.P.S. pipe. Without the collars, 1-1/2” I.P.S. pipecan be used with the same insulator. This is a considerableconvenience in stock keeping.

9/16” diameter through holes are required in each pipe forfield installation of the insulator.

10891-7010891-70Catalog number 10891-70 is similar to 8138-70 but haslarger sockets on the end caps to accommodate 2” I.P.S.pipe.

61400-7061400-70Clamp attachments greatly simplify field installation ofswitch rod insulators since they keep the connection snugwithout drilling and bolting through the pipe. The clampattachment provides a secure, rigid assembly that is equallygood under tension, torsion or compression.

Catalog number 61400-70 will accommodate 1-1/4” or 1-1/2” I.P.S. pipe.

80523-7080523-70Catalog number 80523-70 is similar to 61400-70 but haslarger inside radii on the clamps to accommodate 2” I.P.S.pipe.

CHARACTERISTICS OF SWITCH ROD INSULATORSDimensions

Leakage Distance, Inches 19.0Mechanical Values

Ultimate Tensile Strength, Pounds 12000Ultimate Torsion Strength, Inch-Pounds 25000

Electrical ValuesLow Frequency Dry Flashover, kV 90Low Frequency Wet Flashover, kV 70

31

Rain DeflectorsElectrostatic Rain Deflectors, LappPatent No. 2884479, improve the wetflashover characteristics of the insulatorsby approximately 20% and are suppliedon all station post stacks of 1300 kV BILand above. Each shield consists of twohalf sections made from sheetaluminum.

Lapp Electrostatic Rain Deflectors areavailable for 8” through 18” bolt circles.Contact Lapp Insulator for more detailedinformation.

Figure 1 - Detail of a common raindeflector.

Figure 2 - Method of installing two-piecerain deflector under bolt head duringassembly of station post stack. Do notinstall deflectors between insulatorflanges.

Transition PlatesThese transition plates are designed foruse with large diameter caps on stationpost stacks. Available in three sizes andstrength ratings, these closely spacedunits are for conversion of large boltcircle units to standard bolt circlemounting. The most commonconfigurations are shown in the table tothe right. Several others are alsoavailable, contact Lapp for moreinformation.

The plates are ferrous, hot-dipgalvanized. Tapped holes are .015”oversize to allow for the use ofgalvanized cap screws and still provide agood fit between the threads. Hex headcapscrews, nuts and lock washers arefurnished for large bolt circle mountingonly.

SpacersMounting base number 20161 isdesigned for use with 5” bolt circleinsulators. The spacer is malleable iron,hot-dip galvanized. Four 5/8-11 X 1.25”long capscrews, and lock washers aresupplied for attachment to the 5” boltcircle. Order others seperately ifrequired.

RAIN DEFLECTORRAIN DEFLECTORINSTALLATIONINSTALLATION

Figure 2

RAINRAINDEFLECTORDEFLECTOR

SECTION A-ASECTION A-A

AA

AA

4545°°

BCBC

O.D.O.D.

OVERLAPOVERLAP

Figure 1

TRANSITION PLATE DIMENSIONSCatalog No. Strength Class BC (1)BC (1) MTG (1)MTG (1) TAPTAP BC (2)BC (2) MTG (2)MTG (2) HOLESHOLES

70397 Standard 55 ØØ 6.256.25 5/8-115/8-11 99 ØØ 1010 Ø Ø .56.56

61845 High Strength 55 ØØ 6.256.25 5/8-115/8-11 10.3810.38 ØØ 11.5011.50 ØØ .56 .56

61844 Extra-High Strength 77 ØØ 8.508.50 3/4-103/4-10 1212 ØØ 13.3813.38 ØØ .69 .69

HOLESHOLESTAPTAP

1.01.0BB BB

SECTION B-BSECTION B-B

BC (1)BC (1)

BC (2)BC (2)

MTG (2)MTG (2)

MTG (1)MTG (1)

(4) HOLES(4) HOLESØ .69 THRUØ .69 THRU

Ø 9.75Ø 9.75

8.258.25

.50.50TYPTYP3.503.50

Ø 6.38Ø 6.38

5.05.0

CCCC

(4) HOLES(4) HOLESØ .81 THRUØ .81 THRU

SECTION C-CSECTION C-C

32

Cavity Core No. Solid Core No. Cavity Core No. Solid Core No. Cavity Core No. Solid Core No.10470-70 315202-70 56241-70 314857-70 311908-70 315369-7011654-70 315046-70 59668-70 314867-70 311998-70 314914-7024760-70 315286-70 79297-70 315391-70 311999-70 314934-7025393-70 315041-70 80044-70 314925-70 312554-70 314867-7025565-70 315208-70 80104-70 315369-70 312555-70 318032-7025567-70 315214-70 80110-70 315379-70 312793-70 315174-7027077-70 315205-70 80621-70 315367-70 312794-70 315173-7034245-70 315222-70 90603-70 315362-70 312799-70 315128-7034246-70 315225-70 90742-70 315308-70 312800-70 315176-7034247-70 315227-70 91507-70 315373-70 312801-70 315044-7034248-70 315231-70 91987-70 315330-70 312802-70 315049-7034249-70 315267-70 93350-70 314934-70 312803-70 315053-7034250-70 315278-70 93447-70 315371-70 312812-70 315126-7034534-70 318490-70 9521A-70 315216-70 312813-70 315175-7034535-70 318451-70 97112-70 314914-70 312997-70 319140-7034536-70 318453-70 97805-70 315016-70 313473-70 319019-7034537-70 318455-70 9784-70 315007-70 313475-70 319126-7050439-70 315316-70 9785-70 315210-70 313993-70 319056-7050637-70 315312-70 98151-70 314732-70 314199-70 319128-7050742-70 315304-70 98154-70 318032-70 314201-70 317056-7050908-70 315288-70 300744-70 315391-70 314228-70 317126-7051161-70 315291PA-70 303050-70 315308-70 314504-70 317013-7051202-70 314161-70 305943-70 315013-70 314505-70 317016-7051560-70 315330-70 308135-70 315010-70 314564-70 317053-7051606-70 315324-70 309386-70 315304-70 314591-70 319139-7051688-70 315308-70 309387-70 318059-70 314615-70 317004-7051689-70 315362-70 309388-70 315312-70 314777-70 317174-7052161-70 315295PA-70 309588-70 318461-70 314828-70 317046-7052591-70 315289-70 309821-70 317019-70 314965-70 315056-7053142-70 315368-70 311313-70 318459-70 314970-70 314970-7053143-70 315372-70 311729-70 315019-70 314982-70 314982-7053161-70 318441PA-70 311905-70 315324-70 314994-70 319025-7054794-70 315287-70 311906-70 315368-7055953-70 318457-70 311907-70 315367-70

Catalog No. Page Catalog No. Page Catalog No. Page8138-70 30 315205-70 11,28 317016-70 2810891-70 30 315208-70 12 317019-70 2820161 31 315210-70 13 317025-70 2861400-70 30 315214-70 14 317044-70 2861844 31 315216-70 15 317046-70 2861845 31 315222-70 10 317053-70 2870397 31 315225-70 11 317056-70 2880523-70 30 315227-70 12 317126-70 28314161-70 19 315231-70 13 317128-70 28314732-70 23 315267-70 14 317173-70 28314857-70 17 315278-70 15 317174-70 28314867-70 25 315286-70 16 317175-70 28314914-70 24 315287-70 16 317176-70 28314925-70 19 315288-70 17 318032-70 25314934-70 24 315289-70 17 318059-70 23314970-70 28 315291PA-70 18 318441PA-70 18314982-70 28 315295PA-70 18 318451-70 11315007-70 28 315304-70 19 318453-70 12315010-70 28 315308-70 19 318455-70 13315013-70 28 315312-70 20 318457-70 16315016-70 28 315316-70 20 318459-70 14315019-70 28 315324-70 21 318461-70 15315025-70 28 315330-70 22 318490-70 10315041-70 28 315362-70 20 319019-70 28315044-70 28 315367-70 21 319025-70 28315046-70 28 315368-70 21 319056-70 28315049-70 28 315369-70 21 319126-70 28315053-70 28 315371-70 22 319128-70 28315056-70 28 315372-70 22 319139-70 28315126-70 28 315373-70 22 319140-70 28315128-70 28 315379-70 23 319173-70 28315173-70 28 315391-70 24 319174-70 28315174-70 28 317004-70 28 319175-70 28315175-70 28 317007-70 28 319176-70 28315176-70 28 317010-70 28315202-70 10,28 317013-70 28

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