Document XeK9KJNJQ6owGjbpZnaGvn4K

TECHNICAL BRIEFS ENGINIKRINQ DIVf10PMINTS HIM ABROAD DIGESTED BOR BUSY ROWER REVIEWED IN THIS ISSUE PANEL HEATING Pretest Stohfi of th* Pen*! Hratiag Art Cmporotf*t Parfermonca: Ponal, Caamtien Strain Hrating Control Preellc* Application of Hoot Botaatt Analysis POWER RELAYS Prinelptns and Practice* of Relaying in the United Statu TURBINE OILS Sarvic* taportasca With Tvrbteo og{Rsporfsd for o Kongo of Torfciaa h Host in on hdattriel --Oltwcileat tot ordering (xtpert an giro* o peg IW" Splrotolllc Stylo 9)1--0 general-purpose gasket for lorvfca with both standard and special ffbngo*. Furnished round and in irregubr shopet, Spffotolltc Style9)1--some os91) equip* pod with a specie! centering device to assure accurate positioning of the gasket on reited-foce typo flanges. ditfejeetiot i fritfirl'1 difttrtafMattirbttot/on 1 Typical power system with overlapping relay protective zones. Adequate relaying disconnects imall section of fault 20<000 sapoo Movrs of OPtrOllen 2Typlool anaVlIs for type B turbine oil. Sludging rapid rise in ocld number. Intorfoclol test wos later POWER RELAYS Principle* And Practice* of Belaying Id The Untied States, by W E Matter, Duquesne Light Co end E L Harder, Wesdnghousc Electric Corp. After re viewing general principle* of relaying, the paper coven operation of basic ele ment* in commonly used relay*. Among these are instantaneous, induction, mul tiple-disk, balance-beam unite, and various combinations. Relay practice In connection with generator protection is outlined, cov ering both stator winding and field pro tection. Differential relaying ia used generally to protect, stator windings against ground* and short-circuit* within the machine tone of protection. General trend is towards using relays to detect undervoltage as well as under current in machine's field circuit In protection of transformers, differ ential relaying continues to be the prin ciple form of relay protection. A sup pressor is generally provided to tem porarily desensitize the relay for a time interval sufficient to allow Inrush cur- rent to die out Use of gas-pressure, shows which illustrate typical'j gas-aecomulator and therms! relays on live relay problems and (heir transformer# is discussed b this AIEE AIEE Paper No. 48-196. paper. Satisfactory bus protection is often TURBINE OILSobtained with a straight differential re lay scheme. MulU-restraint ratio-differ ential relays will not operate falsely oven when used with normal-size cur Service Experience With Tkufclatj rent transformers, which saturate due by CL Pope end 0 V Sprague, to the do component of current under Kodak Co. The paper was fault conditions. The paper includes a furnish the results of ope general discussion of linear coupler and ' perienee on lubricating impedance schemes as well as direc team-turbbe generating equips] tional relays io connection with bus Kodak Park, Rochester, N. Y. Tf protection. in this plant range from 1509 In addition to a general discussion of Inv with steam at 260 pst, ST6, * higb-voltago line protection, principles 800 pel, 750 F. All mrbbes Jj of pilot wire and carrier-pilot relaying with a centrifuge continuously l" are covered. General practice in con log the oil. nection with motor protective relaying is also presented. The general idea ol providing over Weekly inspection of the ceB? is made and monthly oil **pV taken, analyzed, and recorded- j lapping protective cones,, shown in oil samples are taken and top. ketch above, is stressed in this paper. EK-Oxidation-Corroiion Tester-, List of subject references is Included es year the main oil itok b drafts] well as schematic sketches showing re inspected, governor mechsob' lay components and vector analysts. bed, oil-cooler water pressor^ Several one line diagrams. Fig. 1, are and bearing covert lifted. & 121 (56*) POWER S*pHOT For a perfect seal on any type flange --J-M Goetze Tyroi need e gasket with greet mechanl* - ml strength plue resilience.. designed vc a perfect seal under practically any * condidgn . . . Goetze Spitotalttcs o the job for you. E%botaillc* owe their unique sealing ac* their special construction consistd preformed corrugated metal strip d with an asbestos filler epiralfy *compressed in service, their spring like characteristic* compensate for any ex pansion or contraction of the joined mem bers due to temperature change*. A tight Bealls made ond maintained with relatively light bolting and their nigged construction frequently makes it possible to re-use them u number of times. Spirotallics are furnished as general purpose gaskets for standard or special Ranges And as boiler, manhole, and tube cap gaskets. Johne-Manvllle mokes a complete lino of Industrial gaskot~-both metallic and non-metaittetypos--to moot ovory service requirement. If you have o tpoclol goskot problem write us. Oar 73 year* of experi ence I* at your disposal to help you solve It. For complete information write for catalog PK-35A. Johns-Manville, Box 290, New York 16, N. Y. Johns-Manville SvpUmher 1940 Gaskets 129