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�' . . . a more unified and :impte form, com�ntized parts . . . "
<br />PROPOSAL: LINES AND LINE STRUCTURES
<br />The essenlial requirements of o tine structu�e are to support conductor and to i
<br />"""'��"'' allow for safe line maintenance. These are the major cuncerns of tower de-
<br />;. signers loday. Our concern is nof morely surface treatme�t, but the total �
<br />planning pitture, how lines and line strudures fit into it and how structural f
<br />� , concepts inf!uence rigM-of-way width. �
<br />i
<br />` Perfect safeiy, high reliohility and low c�st are ever-present standards in '
<br />� p� trpnsmission design, But what other standard is missing? What factor is dealt
<br />with more often in the annual roporls of every growing industry, ihon
<br />�: . exponsion7 �ew BPA installations ever escape the demanding requirements
<br />tof facility growli�. We hove already meniioned its value in regard to �ub-
<br />-� stations. But it is of no (ess imporfance to power transmission. We believe
<br />�� . that line and tower design should incorporate Ihe quality of expandability as
<br />an essentiai criteria in thair design.
<br />��' ose the develo ment of an expandable tronsmission support fo� a
<br />� . We prop P
<br />variety of line configurations; some of its advantages mighl include : a more
<br />�' , r• ' ' 2' � uniFied ond simple lorm, romponentized parts, versatility of arrongement and
<br />�' � •� ease of erection and maintenonce. The last charocteristic is essential in areas
<br />' ,, where mobility is difEicult or impossible.
<br />; �
<br />� - We propose that presenf lattice steel HV tower designs be investigated for
<br />'' p the possibility of reuse for EHV. In a preliminary study, we hove found that
<br />" by replacing Phe upper st�uctu�e of a 230 KV double circuit line tower to .
<br />accommodate one 500 KV line, it is possible 10 double power capocity of the
<br />�� .. p _� Iine. It is olmost certain, however, thot dead -end towers would need compiete
<br />;, ; replacement.
<br />i . . p �'
<br />ANhough insulators are small, relative to most electricol equipmenl, they
<br />' deserve comment since they can be Found wherever electric w�rent flows.
<br />- The mosi common insulafor materiol found throughout BPA is the highly reli-
<br />able ceramic. Its traditional dark brown coloring makes it a most importanfi
<br />visuol element in (ine transmission. NEMA has developed several light colored .
<br />,� insulators which have found acceptonce withelecFricsuppliers. BPA is presently �-�i
<br />- testing other new materials, including fightweight fibergiass, which would offer ,.'
<br />� o wide ronge of tolor and shape. Whatever color or shape is selecfied, ii
<br />3�` d` shouldbe uniForm throughout all new construction in the BPA system.
<br /><< ' ��aab�e i�� ��:s:
<br />We propose the de�relopment o� a color-code system for insulotors as fl meons
<br />�; }� ,,_� of identificotion of line vultage and load for public and employee information: :•{.
<br />, .
<br />:_•� �,. _
<br />`� Last, but not Ieas1, are the conductors, themselves. Alfhough they are not ofien
<br />:4 - ' ' ' : ,�`s
<br />� � �,� ..,v thought oE as unsightly, several aspects require comment. r�
<br />�� .,� We have noticed that under most conditions of lighi, metal conductor hns the '-�:
<br />``ry ��.' - tendency to shine or giow. Alumin�m, especially, produces a semi-briiliant
<br />�� ^ sheen due to ifis "flake" surface ch�rocteristics. This is particufarly obyio.us, e
<br />�t and objeciionrabie, in wooded settings. It is possible to darken ihis sheen with
<br />�" o medium valus low gtoss color applied with an anodizing.process. In the
<br />;�
<br />� r, � proc$ss,-fhe ands of each lengih may be cooted with a cliemical which inhibits
<br />�' ,� ` the acid adion and is loter removed to al4ow a good contact aP the joint. -
<br />�� ��` There are many possibilities but, because of the iovy maintenonce required by ,
<br />� "" ihe an4ciizing process, it appears io be #he most reasonable. Further research _
<br />�3 proposed au.rattonYai double drwit.230 KV" by industry should be instigated toward the discovery of now ways to reduce _
<br />,sPrUcfur'e Fo single circuH 5c�0 KY. shesn. �_
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