US1266480A

US1266480A - Transformer.

Info

Publication number: US1266480A
Application number: US6628015A
Authority: US
Inventors: Svend E Johannesen
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1915-12-11
Filing date: 1915-12-11
Publication date: 1918-05-14
Anticipated expiration: 1935-05-14

Description

S. E. JOHANNESEN.

TRANSFORMER.

APPLICATION FILED Dsc. II. I9I5.

1,266,480. l Patented May14,1918.

2 SHEETS-SHEET l.

'by QM M s. E. JfoHANNEsEN.

TRANSFORMER.

. APPLICATION FILED DEC. Il, 1915. .I 1,266,480. Patented May14,1918. 2 SHEETS-SHEET 2.

Invent Or` Svend BJohannesen,

H isl Attorneg.

vmodern practice.

that the changed, I locate the connection boards so ED 4STATE eviten) E. JoEANNEsEN, or rrrrs'rrnrm, Massaonusn'r'rs., Assrenon ro y i :ELEofrnIo COMPANY, A. corronerron or new roe t TBANSFORMEB.

Specication of Letters Patent.

Patenten nay ia, ieee.

Application led December l1, 1915. Serial No. 66,28@

State of Massachusetts, have invented certain new and useful Improvements `in Transformers, of which the following is a specification.

My invention relates particularly to transformer connection boards.

rlhe connection boards of transformers submerged in cooling and insulating liquids, as oil, are preferaby located beneath the surfaces of the liquids, according tothe best have been placed above the tops of the transformers, in order that they mlght be .readily accessible for changing theconnections; commonly, they have been attached to the tops of the transformers.

' I have found, however, that in some cases, notably with the smaller transformers, 1n order to submerge the connection boards, it is necessary to submerge the transformers to greater depths than is required to properly cool the transformers; in other words, in order to submerge the connection boards, more oil (which is the liquid now commonly used) is required.. than would be required were it not necessary to submerge the con.- nection boards. Tocontain the extra oil, it is necessary to provide a larger tank than would otherwise be required.

rl'he object of my invention is to" avoid the necessity of using unduly large tanks'and volumes of insulating liquid to accommodate the connection boards -below the liquid level I accomplishthis object by provlding peculiarly shaped terminal boards adapted t0 be, and located, at the sides of the transformers and below the tops thereof. Thus the liquid depths, and hence the heights, o thc tanks may be determined by the heights ot' the transformers alone; any depths of liquid that submerge the transformers must subnlerge the connection boards. In order connections may be readily that each one is directly accessible through an opening in the tank iving access to the transformer. and pre erably I provide suitable connecting members extending substantially parallel to the axis of the tank from the connection boards to a position above the liquid level accessible through Heretofore, these boardsA said opening in the tank; in other words,` the' connection boards are so located thatA no parts of the transformer over hang the connection boards and thus interfere with direct access to' the connection boards through the tank opening.

In the accompanying drawings I have embodying my invention and shown this connection board located in ,accordance therewith.

Figure l shows the board in elevation,`

y illustrated one form of connection board the same material as the body portion 10.

`The body portion is provided withl thr'ee

vertical holes

12, 13, and 14, for receiving the terminals and leads. Each connection board is provided with two terminals 15, adapted to be attached to winding leads,

`and a connecting member 18 for changing the connections at the board. The lower end of' 'each terminal 15 is attached' to a.

lead, and the upper end. is externallythreaded at 21; an annular shoulder 20 i's located between the two ends. The annular shoulder 20 coperates with a shoulder 22 provided in the respective holes '12, 13,V

and 14 to revent the terminal from being drawn entlrely through the body portion 10, as will be apparent. The threaded por tion 21 of the terminal receives a threaded nut 23, both to hold the terminal 15 in position in the body portion 10 of the connecting board and to make necessary connections to this terminal. In certain cases, as illustrated in Figs. l and 4, another terminal, in the form of an eye member 27, is engaged with the terminal 15 -by being placed around the terminal 15 between the nut 23 and the body ortion 10 of the con-v nection board. Was ers 28 ma be used as desired. The nut 23, it w1l1 be observed, is considerably longer than the portion of the terminal 15 projecting above the body portion 10 oi the connection board. The upper end oi' this nut 23, as Well as its lower end, is internally threaded, and receives in' its 'upper end the threaded me tallic portion 29 of the connecting member 18. 'llhe upper portion oi, the connecting member 18 comprises a handle 30 of insulating material.. A. second eye terminal 81 is, in some cases, carried by this member 18 as illustrated; in any` desirable way the metallic portion 29 may carry this eye terminal 31 so :that the metallic portion 29 may be screwed into and out oi the nut 28,

electrically engaging and disengaging the` eye 81 with the nut 23, without requiring the rotation oi the eye 31. ris will be observed from Figs. 1 and 5, the connecting member 18 projects above the oil level 32 of the transformer tank. The connecting member 18, as is apparent, may be readily disconnected from the terminal 15 in the hole 12, and may be as readily reconnected in the terminal 15 oi the hole 1d of the same connecting board. llt will be observed that the hole 18 ci the comiection hoard of Fig; 1 carries no terminal. similar to 15, but a lead 33 is carried directly through this hole 13 and is fastened to 'the eye Iterminal 81. ldhich., and how many, holes of the connection boards-'oi this type are supplied with terminals like 15, and' also the number and location ci 'the eye ter minals like 27 and 31, are, in each case, subject to considerable variation, and are determined by the consideration oit' the case in hand. Another disposition of the eye terminals is illustrated in Fig. 8, and will be described in detail with reference to this gure.

Connection boards substantially similar to that of Fig. 1 are connected to the sides oiJ their respective transformers, below the tops thereof so that at least the terminals on the connection boards are directly exposed to the surfaces of the oil (or other duid) submerging the transformers. lin other words, the connection boards are so located atthe sides of the transformers that unobstructed access to their terminals may be had through the surface ot the oil for the purpose of making or changing the connections thereof. 'llhe relatively thin, broad projecting portions 11 are provided in order that tape 38 (see Figs. 2 and 5) may be wound around the Vtransformer coils and these projecting portions 11 to attach. the connection boards to the coils. lln Fig. 2, ll have illustrated both the hi h and low voltage line leads connected to t e windings by means of said connection boards; Fig. 5 shows the lconnections on the low voltage side. The connection boards 39 for the high voltage winding and line leads 40 are simi-v lar in vall respects to that shown in Fig. 1.

ineens@ To insulate these boards from the walls ci Fig. l; the dierence between these boards f will be understood from the description of Fig. 3 which follows. 'llhe high potential line leads i0 and the low potential line leads e5, pass out of the tank through insulated bushings 4:6, as heretofore. i

The specific connection board which l have illustrated in Fig. 1, and heretofore described, may be slightly varied igor malring different sorts of connections. rlihus, in Fig. 3 ll have illustrated the connection board as arranged for use with low potential windings of the smaller transformers, as the leads are now brought from such windings. lit will be observed that the low potential winding 50 is provided with two end leads 51 and two tap leads 52, for giving the slight diderences in voltages sometimes required. @ne low potential terminal board is provided for each low potential lead 45, as is also illustrated in Fig. 2. Flach connection boa-rd comprises two terminal members similar to Fig. 1, located in the holes 12 and 11i as in that rigure. The third hole 13 is, however, unoccupied in this case. @ne of the end leads 51 and the adjacent tap lead 52 are attached to the termi-- nais 15 of one of the connection boards.

rlhe correspondingline lead i5 is connected to the eye terminal 271,' and this eyeterminal is carried by the connecting member 18, as the eye terminal 3l is carried by the connecting member 18 in Fig. 1.` :it will be observed from this description, and from Fig. 3, that each line lead a5 may be connected itoene of the end leads 51 or the adjacent tap lead 52. '.lhat is, the connecting member 18, carrying a line lead 4:5, may be unscrewed Lfrom one terminal 15 and screwed into the other, thus changing the connection of the line lead a5 from one end e lead 51 to the corresponding tap lead 52, or

lil@

boards through the holes 13 therein, asA shown. The remaining terminals 15, in each;` of the two connection boards used, arev joined by a conductor 66. Now, it will be apparent that when the connecting member 18 is inserted in the outside terminals 15, as shown in Fig. 4, the two

halves

60 and 61 of the high voltage winding are connected in multiple. However, as will be understood from Fig. 1, these connecting members 18 may be readily removed from these terminals 15, and, carryingthe ends of the

leads

64 and 65, may be inserted-into the inside terminals 15 joined by the 'connecting conductor 66. In such an arrangement, it will be apparent that the two halves 60 and 6l of the winding are connected in series.

VWhile I have described the principle of my invention, and the best n iode have contemplated for applying this principle, other modifications will occur to those skilled in this art, and4 I aim in the appended claims to cover all modifications which do not involve a departure from the spirit and scope of my invention.

What I claim 4as new, and desire to secure by Letters Patent of the United States, 1s

1. The combination with a tank and a transformer submerged 1n a liquid in said tank, said tank being provided with an opening giving access to said transformer, of a connection board for terminals of said transformer, attached to a side of said transformer below the top thereof and directly accessible through said opening in said tank.

2. The combination with a tank and a transformer submerged in a liquid in said tank, said tank being provided with an opening at the top thereof giving access to said transformer, of a connection board, directly accessible through said opening in said tank, attached to'a side of said transformer below the top thereof and 4having terminals of the windings of said transformer exposed thereon, and a connecting member for making various connections with said terminals.

3. The combination with a tank and a transformer submer ed in a liquid in said tank, said tank being provided with an opening above the surface of said liquid giving access to said transformer of a connection board attached to a side of said transformer below the top thereof and hav- Aing terminals of the windings of said transformer exposed thereon, and a connecting member for making various connections with said terminals, said connecting mem- 'ber extending substantially parallel with 1 the vertical axis of said tank from said connection board to a position above #the surface of said liquid accessible through said opening in said tank.

4. The combination with a tank, a transformer submerged in a liquid in Said tank, and the line leads vfor one of the windings of said transformer, said tank being provided with an opening above the surface of said liquid giving access to said transformer, of a connection board for each of said line leads at which the terminals of said winding and the line leads are exposed, said connection boards being attached to sides of said transformer below the top thereof, and a connecting member for each of said connection boards for interconnecting said line leads and terminals in various arrangements, said connecting members extending substantially parallel with the vertical axis of said tank from the connection boards to positions above the surface of said liquid accessible through said opening in said tank.

5. A terminal board for electrical apparatus comprising an insulating body portion provided with two relatively thin, broad attaching extensions extending from op ositeisides of said bodyvportion, and a pli rality of terminals carried by said body por-- tion at one of said sides thereof, adapted to be attached to the apparatus leads.

6. The combination with a transformer, of a terminal board therefor comprising an insulating body portion provided with a relatively thin vportion extending along and taped to a coil of said transformer, and a plurality of terminals carried by said body portion adapted to be attached to theapparatus leads.

In witness whereof, I have hereunto set my hand this seventh day of December, 1915.