US1638919A - Electrical switch gear - Google Patents

Description

16 1 638 919 Aug 1927 w. A. COATES ET AL ELECTRICAL SWITCH GEAR Filed Sept, 2, 1921 4 Sheets-Sheet 1 fil a III 7 l i I. --\V l I 52 I I E l l K" I 63 42 V v WITNESS? Wl LIVENTORS- &

' 1' mm cafes W Dav/H A. Dav/es I L- BY gig/1g? 11 1 ATTORNEY Au 16 1927. 1638 919 g w. A. COATES |;:T AL

ELECTRICAL SWITCH GEAR Filed Sept, 2. 1921 4 Sheets-Sheet 2.

WITNESSES: INVENTOR 5 MI/idm A. Coa (es &

06 R. 0a vies Aug. 16, 1927.

W. A. COATES ET AL ELECTRICAL SWITCH GEAR Filed Se t, 2. 1921 4 SheetsSheet 3 INVENTORS I William ACoates 6k lgYav/d R. Dav/es ATTORNEY I Aug'. 16, 1921. ,638,9 9

W. A. COATES ET AL' ELECTRICAL SWITCH GEAR Filed Sept. .2, 1921 4 Sheets-Sheet 4 WITNESSES: I INVENTORS David R. Dav} e W4 1; BY

' I ATTORNEY Patented Aug. 16, 192 7. I

UNITED STATES \VILLIAM ANSELM ('JOATES, OI CHOB-LTON-CUM-HARDY, AND -DAVID REGINALD DAVIES, OF STBETFORD, ENGLAND, ASSIGNORS '10 WESTINGHOUSE ELECTRIC AND KANUEAOTUBING COMPANY, A CORPORATION OF PENNSYLVANIA.

nmc'rarcu' .swrrcn GEAR.

Application filed September a, 1921, Serial no. 497,902, and i Great mam September as, 1920.

Our invention relates to electrical switch gear and particularly to switch gear of the enclosed type.

One object of our invention is to provide a switch gear in which various parts thereof, such as the isolating and selector switches, the numerous electrical conductors, the instrument and other transformers or such ofthese devices asvare or may be connected to the main oil switch and the bus bars, are enclosed in casings, usually of metal.

A further object of our invention is to provide switch gear of the above type wherein the switches for connecting the oil switch to the cable leads or bus bars are disposed in an oil tank with their movable contacts adapted to be operated by bodily raising and lowering the tank.

Another object of our invention is to provide a switch mechanism wherein selector switchesare provided for selectively connecting the main or oil switch with-either of two setsof bus bars and wherein the selector switches are of the bridge type having movable bridges disposed within an oil tank and ada ted to be moved into registry with selecte contacts of the selector switches. R

- vide a switch mechanism having the above characteristics wherein the bridge members of the selector switches are mounted within an oil receptacle and are operated by bodilv raising and lowering the receptacle, and wherein movement of the tank for operation of the bridges is precluded so long as the bridges are in an intermediate position between open and closed positions and where- 40 in selective movement of the bridges is precluded so long as the switch is in closed position.

A further object of our invention 1s to provide a switch mechanism, of the abovedescribed character, wherein the tank for enclosing the isolating and selector switches is moved bodily for the purpose of opening and closing the switches and wherein movable supporting members for operating- 0 the tank are simultaneously actuated by a single operating device disposed to be conveniently accessible from the front of the mechanism.

These and other objects that will be made said tank. of the bridge type having the contact fin- Another object of our invention" is to proapparent throughout the further description of the invention are attained by means of the switch mechanism hereinafter described, and illustrated in the accompanying drawings.

According to our invention, the isolating and also the selector switches, if provided, are arranged in an oil tank and are-operated by bodilv raising and lowering the The switches are conveniently gers downwardlv directed, the bridges of the switches being supported in the bottom of the tank on suitable insulators and in such position relative to the contact fingers that the switches are closed when the tank is raised and are opened when the tank is lowered.

The tank containing the isolating and selector switches may be raised and lowered for closing and opening the said switches by any convenient means, such, for exam ple, as screw-and-nut mechanism operated by turning a handlev through a chainand sprockets.

In cases where duplicate sets of bus bars are rovided with selector switches for con-' nectmg up either the one or the other set of busbars, ,the'bridges of suchselector switches may be so disposed in the tank that they may be moved horizontally tobridge alternative sets of contact fingers connected, respectively, to the two sets of bus bars, any suitable mechanism being employed for shifting the bridges.

In a convenient constructional embodiment of the switch gear, the main oil switch tank and the isolating and selector-switch tank may be located, the one behind the other, a tank containing the series transformers and certain of the electrical conductors being disposed across the top of both tanks while the cable-dividing or trifurcating box may be located between them. The bus bar chamber may be located above the rear portion of the isolating and selector-switch tank. I

'To enable the invention to be clearly understood, it will now be described with reference to the accompanying drawings, which illustrate, by way of example, a construction of switch gear in accordance with the Fi re 1 isa side elevation of a complete switc gear, embodying our invention;

Fig. 2 is a front elevation of the switch gear;

Fig. 3 is a sectional view showing the essential elements of one phase of the switch gear, the section being taken-on the line IIIIII of Fig. 2;

Fig. 4 is a sectional elevation of the switch ear looking in the direction of the arrow, ig. 3), the left-hand portion being a section on the line IVIV while the righthagd portion is a section on the line V-V; an

.Fig. 5 is an electrical diagram of the circuits of one phase conductor of the switch gear, and

Fig. 6 is a horizontal sectional view taken on the line VIVI of Fig. 4, in the direc-- tion of the arrows.

Referring first to Fig.5, which shows, in

' tions which the switch gear is designed to 2 and 3 are, respectively, the sets of main control. 1 is the cable, for examp1e,.an incoming three-core split-conductor feeder and and auxiliary or hospital bus. bars, to which'the cable 1 is to be alternatively connected. The split conductors 4 of each phase conductor core 5 are connected to the terminals 6 of the isolating switches 7 which are of the brid type, the bridges thereof being indica at 8. The other terminals 9 of these switches are connected, b means of conductors 11 and 12, to the spht-conductor-protection transformer 13 and the instrument transformer 14 or such of these devices as are provided and, thence, by means of com bars 2 an quired to use. Referring now1to' Figs. 1 to 4, the

ductors 15 and 16, to one pole 17 of the main .oil switch-18. The other pole 19 of the oil switch .is connected, by a conductor 20, to thetwofixed contacts 21 of the selector switches 22 and 23, the bridge ,of which is indicated at 24. The other fixed contacts 25 and 26 of theselector switches 22 and 23,

respectivel are connected to the main bus the hospital bus bars 3, respectively, by conductors 27. The switches '22 "and 23 are adagfied to be closed alternatively according tow ch set of bus bars it is recable- 1 is sealed intoa trifurcating or dividing box 30 (see "Fig. 1), which is attached to a hollow 'niember.31,'through which the cores -5 extendand in which the conductors 4 separate, the latter being connected'to the terminals 6 of the isolating switches 7, which are .mounted, with their contact fingers downwardly directed, in a table 32 supported by the frame-work 33 of the switch gear. The transformers 13 and 14 and the connections between these devices and the isolating and selector switches and the oil switch 18 tachedE by set screws or any other convenien means, to the frame-work 33 beneath the front end of thecasing 34, as shown in Fig. 3. The casing 34, when the connections therein have been made, is adapted to bev filled with a compound and is provided with removable plugs 36 to permit the compound to be oured in after the casing hasbeen secure in position.

The fixed contacts 21, 25 and 26 of theselector switches are mounted on the table 32 and depend therefrom in a manner similar to the fixed contacts 7 of the isolating switches, and the fixed contacts 25 and 26 are respectively connected, b means of the strip conductors 27, to the us bars which are located in a metal chamber 3 7, situated behind the casing 34 at the rear of the switch gear and supported on the framework 33 above the selector switches.

The depending fixed contacts of the isolating and selector switches are provided with insulators 39, a and4) being located etween the pairs of poles of each switch. The bridges 8 of the isolating switches are carried on rods 8 mounted on a castin or frame 41, which is of skeleton form and extends up at the corners, where it is provided with lugs 46, to which the oil tank 42 is attached. The brides 8 are insulated from the rods 8 by insu atin sleeves 8'. I

The bridges 24 of the selector switches are carried, in a similar manner to the bridges 8, on rods 53 from which they are insulated by sleeves 53 said rods being attached to,

and supported by, brackets 57, adapted to direction of the arrow into the dotted-line position, as shown in Flg. 4. When the said bridges 24 are in the left-hand (full-line) position, they will efiect engagement -of the selector-switch'eontacts 21 with the contacts 25, by which the bus bars 2 are connected. When the said bridges are in the right-hand (dotted-line) position, they will effect engagement of the selector-switch contacts 21 with the contacts 26 so that the bus bars 3 are connected.

Any suitable device may be provided for shifting the bridge 24 from one position to the other for selectively connecting the bus bars. As shown, for example, a vertical shaft 55 has a forked lever 56 at its lower end which engages one of the brackets 57. The shaft 55 has a squaredupper end 58 on which a' link 59 is mounted, said link being partition 40 (Figs. 3

1,ese,e19

operatively connectedto a bevel gear wheel 60 in mesh with a bevel gear wheel '61 on the end of the shaft 62. The shaft '62 extends through the shaft 51, which is made hollow for that purpose, and is furnished with an operating handle 63.

Rotation of the shaft 55 will move the lever 56 to and fro and so cause the brackets 57, with the rods 53 and bridge. pieces 24, to slide along the rods 54 to occupy one or another of the desired positions. .The squared portion 58 of the shaft 55 slides freely in a square hole in the link 59 to permit the tank 42 to be moved up and down, as will now be described.

The tank 42 is adapted to be raised and loweredin order to close or open the isolating and selector switches by engagement of sponding contact fingers 7, 21, and 26. For this purpose, the tank 42 is supported at each corner by means of a screw 43 rotatably mounted in the framework 33 and provided with a head 44 provided with sprocket teeth or to which is attached a sprocket wheel 45.

The screws 43 are in operative engagement with screw-threaded or1fices in the lugs 46 to which are secured the upper corners of the tank 42. With this construction, it will be seen that, by rotating the screws 43 in the one or the other direction, the tank "may be bodily raised or lowered to close andopen.

the isolating and selector switches.

neously rotated by means of a single sprocket cha n such as a cycle chain 47, (Fig. 1), whlch passes around all the sprocket wheels 45. The casing 31 is provided in the middle with a tunnel 31 (see Figs. 1 and3) through which the chain 47 passes. One of the sprocket Wheels is conveniently provided with a bevel gear wheel 49, which is engaged by another bevel gear wheel 50, connected to the hollow shaft 51, which is extended to the front of the apparatus where it is provided with a hand wheel 52, an indicator (not shown) being preferably provided to show whether the isolating and selector switches are open or closed.

, To revent movement of the tank when the bridges 24 are in an intermediate posi 'tion and to prevent movement of the bridges 24 when the tank is in its upper position and the isolating and selector switches are closed, the following interlock mechanism may be employed. A rod 64, depending from the table 32, is adapted to engage the lever 56 when the bridges 24 are inan intermediate position and thereby prevent the tank being raised. When the tank is in its upper position, the rod 64 is on the one or the other side of the lever 56 to prevent movement of the same to shift the position of the bridges when the switches are closed.

A convenient position for the potential transformer 65 (Fig. 5), when provided, is

on the to of the casing 34, the position of the trans ormer tank being indicated at 66 by dotted lines. .The transformer fuses will be preferably located in the tank 66 and immersed in the oil therein. The various caslngs and otherpartsof the switch gear are (1121 rammatlcally indicated by means of bro en lines in Fig. 5. In some cases, in-.

stead 'of arranging the series transformers l3 and 14 in a separate casing 34, it may be found convenient to mount these devices in the oil tank 42 of the isolating and selector switches, in whichcase, the bridge .or bridges 8 for normally connecting between the incoming cable and the said'transformers may be divided, and the latter devices be conthe bridge portions 8 and 24 with the corre*' sections joined together to form a tube. Interlocking mechanism,'which may 'conveniently be'located in a housing 69, is preferably provided in order to prevent the opening of the isolating and selector switches when the oil switch is closed, (2) to prevent The sprocket wheels 45 maybe simultathe closure of the oil switch when the isolating and selector switches are closed, (3) to prevent the closure of-the isolating and se-' section and formed of cast or rolled-metal of such interlocking mechanism are well known, a complete description thereof is deemed'unnecessary. The tank for the oil switch 18 and the tank 42 are filled with oil to the desired level, the bus bar chamber 37 and the trifurcating box 30 and casing 31 are filled with solid insulating compound and the casing 34 may also be filled with a compound.

It will be understood that the invention is not limited to the particular arrangement of switch gear illustrated, as this may be modified in various ways; for example, the bus bar chamber 37 and the casings 34, the oil switch 18, the isolating and selector-switch tank 42 and the trifurcating box 30 may be arranged in different positions relatively to one another. In some cases, the bus bars may not be provided in duplicate so that certain of the so-called selector switches 22 and 23 may be omitted, in which case the said switches would more properly be termed isolating switches. It Will further be understood that the invention is equally aptribution than. the described;

plicable to other s stems of electrical dist rec-phase system herein The term iron-clad is not to be understood as limiting the invention to the use of iron casings as, in some cases, for example, in switch gear for heavy currents, a nonmagnetic metal may be preferable.

e claim as our invention 1. Switch mechanism comprising a closure member, a I receptacle movabl supported thereon and closed thereby, a switch member mounted on the closure member and extending into the rece tacle, a switch member within the receptac e and movable therewith, and means for moving the receptacle with respect to the closure member for movin the last-mentioned switch member into an out of engagement with the first-mentioned i switch member.

' 2. Switch mechanism comprising a receptacle, a switch-member within the receptacle,

a sup orting structure for the receptacle, a

plura ity of switch members mounted thereon, means for relatively moving the receptacle and the supporting structure for operatively connecting the said members, and means for movin one of the switch members for selective y engaging other of the said members.

.3. Switch mechanism comprising a rece tacle, a switch member within the receptac e, ,a su porting structure for the receptacle, hxswitc T imeans mounted on the supporting structure contact members mounted thereon,

forrelatively moving the receptacle and the supporting structure for operatively' connectiug the contact members and the switch member, and means mounted on the supporting-structure for moving the switch member for f'sel ectively engaging the said contact members.

Switch mechanism oomprising a sup- :porting structure, a movable receptacle sup- -subscribed our names this ported thereon, switch contact members mounted upon the supporting structure and extendin into the receptacle, a switch member slida bly mounted within the receptacle I and movable therewith, means mounted on the supporting structure for selectively moving the switch member into registry with selected contact members and means for moving the switch member into. engagement with the selected switch members, and means for preventing selective movement of the switch member so long asthe said switch member is in operative engagement'with a contact member. a

6; Switch mechanism comprising a supporting structure, a movable receptacle supported thereon, switch contact members mounted upon the supporting structure and extendin into the receptacle, a switch member slida ly' mounted within the receptacle and movable therewith, means mounted on the supporting structure for selectively mov-.

ing the switch members, means for movin the switch members into engagement witthe selected switch members, and mean for toward, engagingposition except when it is in registry with the contact member.

In testimony whereof, we have hereunto sixteenth day of August, 1926.

.. WILLIAM ANSELM COATES. DAVID REGINALD DAVIES.

-. preventing movement of the switch member

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