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Патент USA US3036193

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May 22, 1962
v. F. SABOL ET AL
‘
3,036,184
GROUNDING SWITCH
Filed_DeC. '7, 1959
3 Sheets-Sheet 1
334
_. %
X6)
WITNESSES1
“aim/“mg
‘
.
INVENTORS
George Siviy.
Victor E Sobol 8
‘ATTORNEY
May 22, .1962
_ v. F. SABOL
ET AL
3,03 6, l 84
GROUNDING SWITCH
Filed Dec. '7, 1959
5 Sheets-Sheet 2
Fig. 2.
May 22, 1962
v. F. SABOL ET AL
3,036,184
GROUNDING SWITCH
Filed Dec. 7, 1959
3 Sheets-Sheet 3
C@
3,036,184
Patented May 22, 1962
2
in copending application No. 842,486, tiled September 25,
3,036,184
GROUNDING SWITCH
Victor F. Sabol, East Pittsburgh, and George Siviy, Mon
roeville, Pa., assignors to Westinghouse Electric Cor
poration, East Pittsburgh, Pa., a corporation of Penn
sylvania
Filed Dec. 7, 1959, Ser. No. 857,632
7 Claims. (Cl. 200—163)
1959 which is assigned to the same assignee as the present
application.
As shown, the disconnect switch structure comprises
5 three spaced tripodic insulator stacks 12, 12, 12, each
mounted on a single elongated base member 13 by means
of brackets 14 and 15 associated with each tripod. The
‘base member 13 is comprised of galvanized steel, prefer
ably tubular in form, to provide maximum rigidity. The
This invention relates to high voltage switchm and, 10 base 13 is rigidly mounted upon the upper end of a pair
of spaced base support members 16, 16. A terminal pad
ing switches.
more particularly, to switches commonly known as ground
17, a surge suppressor 18 and contact jaws 19 are ?xed
to the apex of each one of the two end tripods 12, 12. A
contact cluster 20 is ?xed to the bottom of and are elec
Disconnect switches are utilized in electric power sys
tems to isolate transmission lines and high voltage elec
trical apparatus before handling for inspection or repair. 15 trically connected to the pad 17 to the left of FIG. 1, and
To prevent injury to personnel in the event the apparatus
serves to cooperate with the grounding switch in a manner
becomes reenergized, it is ‘common practice to provide
hereinafter described. The center tripod 12 serves as a
auxiliary grounding switches to ground the transmission
rigid support for each of a pair of switch blades 21, 21 ar
lines to drain off any static charge that may remain after
ranged in back to back relationship, each having an end
an isolation operation of the disconnect switch.
20 rigidly ?xed to one of a pair of housings 22, 22 pivoted to
Heretofore, grounding switches have been simple, pivot
the top portion of center tripod 12, each housing having a
al blades. However, with the advent of larger disconnect
switch operating mechanism enclosed therein. As de
switches for operation on very high power systems, the
scribed in the aforesaid copending application, the oper
pivotal blade type of grounding switch is impractical be
ating mechanisms within the housings 22, 22 each includes
cause the increased size of the disconnect switches necessi
25 an input shaft 23, which may be rotated to effect rotation
tates a corresponding increase in length of the auxiliary
grounding pivotal blade, which, in turn, necessitates a
larger operating force, particularly under severe icing con
ditions. Thus, it is apparent that to merely increase the
size of present pivotal blade type grounding switches be 30
comes impractical.
Accordingly, it is an object of this invention to pro
of blade 21 within contact jaws 19 to disengage the blades
from the contact jaws, and subsequently pivot the blades
from the horizontal position shown in FIG. 1 in full lines
to the vertical position shown in FIG. 1 in broken lines.
Similarly, rotation of input shafts 23, 23 in the opposite
direction will reverse the procedure described. The rota
tion of input shafts 23, 23 is achieved by a gear mecha
vide a grounding switch having a reciprocating member
nism 24 which operates in response to rotation of an insu
carrying the movable contact.
lator stack 25 serving as a drive shaft. A reversible motor
More speci?cally, it is an object of this invention to 35 26 mounted below the base member 13 is connected to the
provide a grounding switch having telescoping means car
lower end of the drive shaft 25 to provide the prime
rying the movable contact.
driving force. Reverse operation of the motor serves to
Still more speci?cally, it is an object of this invention to
close the disconnect switch.
provide a pair of vertically aligned members carrying a
As explained hereinbefore, it is desirable to ground the
movable contact and wherein the upper member telescopes
over the lower member to prevent ice from forming upon
the bearings between the members when the grounding
switch is in a closed position.
It is a further object of this invention to provide novel
line or apparatus which may be connected to the terminal
pad 17 at the left of FIG. 1 after it has been isolated in
order to drain oil? a static charge that may remain and to
prevent injury to operating personnel in the event that the
apparatus accidentally becomes reenergized. The ground
operating means for actuating a reciprocating grounding 45 ing switch 11 is provided to perform the grounding oper
switch.
Other objects of my invention will be explained fully
hereinafter or will be apparent to those skilled in the art.
For a better understanding of the nature and objects of
ation.
As shown in detail in FIGS. 3, 4 and S, the grounding
switch 11 comprises a tubular contact carrying member
28 which is mounted telescopically upon a carrier column
the invention, reference may be had to the following de 50 29 having a diameter smaller than that of contact carrier '
tailed description, taken in conjunction with the accom
member 28 so that the contact carrying member 28 en—
panying drawings, in which:
closes the carrier column 29 when the grounding switch is
FIG. 1 is an elevational view of a disconnecting switch
in the open position as shown in FIGS. 3 and 4. The
contact carrying member 28 and the carrier column 29
55 are spaced from each other, and maintained in alignment
with respect to each other, by means of bearing means 30
FIG. 2 is a fragmentary end elevational View of the
laterally ?xed at the upper end of carrier column 29 to’
combined disconnect switch and grounding switch taken
engage the interior surface of contact carrying means 28
from the left of FIG. 1, but showing the grounding switch
and by means of bearing means 31 ?xed to the lower end
in the closed condition;
60 of contact carrying member 28 to engage the carrier
FIG. 3 is a side elevational view of the grounding
column 29. The bearing means 30 and 31 may be of any
and grounding switch showing the general relationship
therebetween, and showing the grounding switch in the
open condition;
switch, taken partly in section to show the operating mech
anism of one embodiment of this invention;
FIG. 4 is a sectional view of the grounding switch taken
suitable type, as desired.
>
The carrier column 29 is rigidly mounted upon a
support plate 32 which is adjustably ?xed within
from the right of FIG. 3 substantially along the lines 65 acolumn
grounding switch housing 33 by means of leveling
IV—IV, showing the switch in the open condition;
screws 34 connecting the support 32 and the housing base
FIG. 5 is a sectional view of the grounding switch
35. The upper end of the housing 33 includes a restricted
neck portion 36 which is ?xed to and extends upwardly
through the tubular base 13 of the disconnect switch 10
1 and 2, the structure shown therein comprises a discon
70 to a height substantially equal to that of the carrier
necting switch assembly 10 and a grounding switch 11.
column 29. Thus, the neck portion of the housing 33
The disconnect switch 10 may be of the type described
cooperates with the base 13‘ to ?xedly align the ground
shown in a partially closed condition.
Referring to the drawings, and particularly to FIGS.
3,086,184
3
.
4
rider 57 is slidably attached to the guide bar, and is
?xedly attached to the lower end of the contact carrying
member 28 by means of arconnecting stud 58. A pair
of limit switches 59, 59 are provided at opposite ends of
the’ guide bar 55 for engagement with the rider 57 and
ing switch 11 with respect to terminal pad 17 and the
previously described grounding switch. ?xed contact 20
(FIG. 1) ?xed thereto, and .at the same time serves as an
all weather protector for the contact carrying member 28
and the carrier column 29 in a manner to be hereinafter
may be electrically connected in obvious manner to pro
described.
vide operation of position indicators (not shown) and to
There is provided at the upper end of contact carrying’
shut 01f the motor 52 to thus de?ne the limits of travel of
the contact carrying member 28 with respect to the carrier
the opening between the upper end of the neck portion 36 10 member 29. It is seen that the guide bar 55 maintains
alignment between the limit switches and the rider 57.
of housing 33 and the upper end of contact carrying mem:
A spring clip 27 is attached to the lower end of contact
ber 28 when the contact, carrying member is in the open
carrying member 28 and rides against carrier member 2-9
position as shown in FIG. 4. This construction prevents‘
to assure that contact 40 is continuously connected to
accumulation of ice or the entry of other foreign matter
ground in the event an arcing condition should occur be
which may inhibit or prevent reciprocal movement of the
tween contacts 20‘ and 40 during a closing operation of
contact carrying member 28 with respect to the carrier
the grounding switch but before the switch is completely
column 29. A ?nger contact mechanism 40 is ?xed to
closed. The presence ‘of the spring clip permits the use
the upper end of the contact carrying member 28 and
of insulating type bearings, if desired, between'the recip
extends upwardly of the ?ange 38‘ so as to be readily in
rocable members and between the rider 57 and guide
serted into the cluster contact 20 on pad 17 (FIG. 1')
member 28 a peripheral ?ange‘portion 38 having a down
wardly extending peripheral lip 39 for effectively closing
when thecontact carrying member 28 is fully extended.
bar 55.
It is seen that when the contact carrying member 28 is in
the fully extended or closed condition so that ?ange 38
'
provided a grounding switch comprised of reciprocable
From the foregoing, it is apparent that there has been
members carrying a grounding contact vertically into
does not cover the opening between housing neck 36 and
contact carrying member 28, the position of the bearings
25 contact with mating contacts on the line side of a main
30 and 31 between the larger diameter contact carrying
member 28 and the smaller diameter carrier column 29
would be, required to operate a large pivotal type of
switch 2 such structure minimizing the forces which
provides‘substantial isolation of the bearings from the
atmosphere to thus prevent the formation of ice upon the
switch. The telescopic nature of the reciprocable mem~
her, with the member having the larger diameter sup
bearings, which formation might inhibit or prevent a con
ported by the other member, protects the bearings be
tact opening operation of the grounding switch.
The operating mechanism for providing reciprocal
necessaryto initiate operation of the grounding switch.
tween the members frcm icing, to thus minimize the ‘force
It is to be understood that in a polyphase system, the
movement of the contact carrying member 23 with respect
hereinhefo're described grounding switch mechanisms may
to the carrier column 29 is comprised of a chain and
be provided in each phase, and that the operating motors
sprocket mechanism. Speci?cally, a pair of parallel con
may be electrically interconnected to operate simultane
tinuous chains 45, 45 are arranged on opposite sides of
ously in response to a single control. It is also to be
the contact carrier member 28, each chain ridingover
one of a pair of upper sprockets 46, 46 attached to the . understood that a hydraulic drive mechanism may be sub
stituted for the chain and sprocket drive mechanism.
top of the housing 33 by any suitable bracket means, and
'Since numerous changes may be made in the above
40
one of a pair of lower sprockets 47, 47 attached tothe
described construction and different embodiments of the
support member 32 by any suitable bracket means. Each
invention may be made without departing from the spirit
chain 45, 45 is connected toithe contact carrying mem
and scope thereof, it is in-tended'that all matter contained
ber28 by means of one of a pair of studs 48, 48 lateral
in
the foregoing description or shown in the accompany
ly affixed to the lower end of the contact carrying mem
ber 28. The chains 45, 45 are simultaneously driven by 45 ing drawings shall be interpreted as illustrative and not in
.a limiting sense.
a pair of drive sprockets 49 connected to the housing by
We claim as our invention:
suitable bracket means (not shown) and, each engaging
1. In a switch mechanism: a-housing having an opening
at the top; a ?rst member mounted in said housing and
one of the chains. The sprockets 49‘ are rigidly con
nected together by a common shaft 50. A worm'gear 511
is driven by a reversible motor 52 to turn the shaft 50
7for operating the chains 45, 45 to raise or lower the con
extending axially upward toward said opening; a second
member telescopically enclosing said ?rst member for
movement between upper and lower extremities along the
tact carrying member 28. A pair of idler sprockets '53,
axis of said ?rst member and extending upwardly through
53 are ?xed-to the housing by suitable bracket means (not
said
opening when the second member is at the lowermost
shown) “and are positioned adjacent the drive sprockets
.49 to provide appropriate tension on the chains 45, 45 55 extremity; a peripheral ?ange on the upper portion of said
second member and extending outwardly beyond the diam
and to assure meshing engagement between chains 45, 45
eter of the upper portion of the housing; peripheral lip
and drive sprockets 49, 49. A hand crank 54 isprovided
means on said ?ange and extending downwardly below
the top of the housing when the second member is in the
lower extremity; contact means on the upper end of the
as an alternate mechanism for operating the worm drive
mechanism 51 in the event the motor 52 is inoperable.
‘The provision of a pair of chainsprevents'theQoccurrence
second member; and, means operable to provide recipro—
of a bind which might occur between the contact carrying
member and the carrier member if only one chain were
used.
7
cal movement between the ?rst member and the second
member.
.
2. In a switch mechanism: a base, a carrier column ex
An auxiliary grounding contact blade 41 is carried at
'the lower end of the contact carrying member '28 to en
gage contact jaws 42 when the contact carrying member
28 is fully extended. The contact jaws 42 may be sup
ported on the housing 33 by any suitable means such as
a bracket 43, and maybe connected to ground by suitable
conductor
means
44.
'
‘
'
V
'
'
As shown in FIG. 4, a guide bar 55‘is providedyadja
cent‘the contact carrying member 28'forpreventing rota
tion of the contact'carrying member about the longitu
dinal axis during reciprocal movement thereof. A pair
of brackets '56, 56 .?x the guide bar to the housing. A
65
tending upwardly from said base; a contact carrying tubu
lar member having a closed end and having a diameter
larger than that of said carrier column; said contact car
rying member ?tted telescopically over said carrier col
umn; bearing means between the carrier column and the
70 contact carrying member; and, means operable to provide
reciprocating movement between the contact carrying
member and thecarrier column.
Y
3. In a switch mechanism: a base, a carrier column
extending upwardly from said base, a contact carrying
tubular member having a closed end and having a diam
5
3,038,184
eter larger than that of said carrier column; said contact
‘carrying member ?tted telescopically over said carrier
column; bearing means on the upper portion of the carrier
column engaging the contact carrying member; bearing
6. In combination: a tubular base; means supporting
the base above ground; insulator means supported on the
base, a disconnect switch including contact means mount
ed on terminal means and mounted at the top of the
insulator means; ?xed grounding switch contact means
ber engaging the carrier column; and means operable to
mounted on the terminal means; a movable contact for
provide reciprocating movement between the carrier col
mating with the ?xed contact means; reciprocable means
umn and the contact carrying member.
connected to ground and operable to carry the movable
4. In a grounding switch: ?xed contact means; mova
contact into and out of engagement with the ?xed con
ble contact means for engaging said ?xed contact means; 10 tact means; independently supported means for housing
reciprocable means for carrying said movable contact
the reciprocable means below the base and extending.
means into and out of engagement with said ?xed contact
through the base to provide alignment between the mova
means; grounded contact means; auxiliary contact means
ble contact means and the ?xed contact means; and
carried by said reciprocable means to engage said ground
means for operating the reciprocable means.
ed contact means only when said movable contact means 15
7. In a switch mechanism: a ?xed carrier column; a‘
is engaged with said ?xed contact means; and means for
contact carrying member telescopically ?tted on the carrier
operating said reciprocable means.
column; a pair of spaced sprocket means on opposite sides
5. In combination: a base; means supporting the base
of the carrier column, each pair of sprocket means aligned
above ground; insulator means supported on the base; a
parallel to the axis of telescopic movement; a continuous
disconnect switch including contact means mounted on 20 chain on each pair of sprocket means; means connecting
terminal means and mounted at the top of the insulator
the lower end of the contact carrying member to each
means; ?xed grounding switch contact means mounted on
chain; means engaging both chains and operable to simul
the terminal means; a movable contact for mating with
taneously move both chains over the corresponding
the ?xed contact means; reciprocable means connected to
sprocket means to raise and lower the contact carrying
ground and operable to carry the movable contact into 25 member with respect to the carrier member.
and out of engagement with the ?xed contact means;
independently supported means for housing the reciproca
References Cited in the ?le of this patent
ble means and attached to the base member to provide
UNITED STATES PATENTS
alignment between the movable contact means and the
Koppitz ______________ __ Dec. 1, 1936
?xed contact means; and means for operating the recipro 30 2,062,580
means on the lower portion of the contact carrying mem
cable means.
2,697,144
Owens ______________ __ Dec. 14, 1954
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