Transcription of STATION POST INSULATORS
1 1 STATION POST INSULATORS Design Features2 Design Applications STATION Post Units - 95 kV BIL thru 750 kV BIL5 STATION Post Stacks - 900 kV BIL thru 2050 kV BIL6 Flashover and Withstand Values7RG INSULATORS : Semi-Conductive Glaze8 RG Part Number Conversion Table9 Single-Piece STATION Post Units 95 kV BIL10 110 kV BIL11 150 kV BIL12 200 kV BIL13 250 kV BIL14 350 kV BIL15 550 kV BIL16 650 kV BIL17 750 kV BIL18 Multiple-Unit STATION Post Stacks 900 kV BIL19 1050 kV BIL20 1300 kV BIL21 1470 kV BIL22 1550 kV BIL23 1800 kV BIL24 2050 kV BIL25 Cap and Pin Replacement Insulators26 Cap and Pin Selection Chart28 Switch Operating Rod Insulators30 Electrostatic Rain Deflectors, Transition Plates.
2 And Spacers31 Part Number Conversion Table - Cavity Core to Solid Core32 Numerical IndexInside Back Cover2 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 Lapp STATION post INSULATORS meetANSI leakage requirements.
3 We alsooffer high leakage ( H ) and extra-highleakage ( E ) versions of these standardcatalog 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 are available in ratings from 95kV BIL through 2050 kV BIL foroperating voltages kV thru 1100 Features HardwareAll Lapp STATION posts have externallyattached caps and/or bases.
4 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.
5 Thisprovides the optimum leakage surface. Short, sturdy shedsThe porcelain sheds protect the bodyfrom impact or flashover. They willwithstand severe mechanical 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.
6 Standard bolt circlesLapp STATION post caps and bases havebolt holes on standard bolt circles forinterchangeability and ease of 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. 3 Minimum deflectionLapp STATION posts provide maximumstiffness in a switch and bus insulatordesign, an important feature in tallerstacks for higher voltages.
7 STATION poststacks for high voltage and EHV aremade up of single-piece porcelain withexternally attached hardware boltedtogether in a strong, rigid 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 EHV assembliesTapered STATION post stacks made up ofmixed units of different diameters andstrength ratings are lighter in weight thanuniform-diameter assemblies and offerconsiderable economy.
8 Electrical andcantilever characteristics are equivalentto uniform-diameter STATION rain deflectorThe wet flashover characteristics of thetaller STATION post stacks are improvedby placing metal rain deflectors ( No. 2884479) between each ofthe sections. The deflectors use theelectrostatic field surrounding theinsulator to disperse falling rainwaterand prevent flooding of the 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 .
9 Cavitycore STATION posts receive an electricaltest in accordance with ANSI Section before assembly ofhardware. After assembly each cavitycore unit is tested mechanically to 50%of rated tension 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 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 post reliabilityWhen designers specify Lapp stationpost INSULATORS .
10 They do so with theconfidence that they will receiveproducts that are backed by a longhistory of low-maintenance service in awide variety of demanding 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 from radio-TVinterferenceLapp STATION posts are low capacitanceinsulators by design.
