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Патент USA US2134560

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0d. 25; 1938. ‘
H, H‘ KERR
ELECTRICAL APPARATUS
Filed May 22, 1937
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2,134,560
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INVENTOR
Henry H.
err:
2,134,560
Patented Oct. 25, 1938
UNITED STATES PATENT OFFICE
2,134,560
ELECTRICAL APPARATUS
Henry H. Kerr, Toledo, Ohio, assignor to West
inghouse Electric & Manufacturing Company,
East Pittsburgh, Pa., a corporation of Pennsyl
Vania
Application May 22, 1937, Serial No. 144,165
11 Claims.
(Cl. 171-97)
This invention relates to electrical apparatus
and particularly to grounding switches.
In the operation of electrical apparatus such
as transformers, different types of grounding
5 switches have been developed for insuring a
movement of the switch to connect the power
line to the transformer before grounding the
power line. Thus, if the power line is alive the
transformer is so energized that an associated
interlock locks the switch member and prevents
further movement of the switch member to the
ground position.
The different types of grounding switches de
veloped for such use, however, do not permit
15 an inspection of the transformer when the trans
_ former is connected to the power line but not
connected in the network. This is a serious dis
advantage since in many cases a plurality of
transiormers are connected to the same high
20 voltage feeder cable and in order to ground the
power line it is necessary to deenergize the feeder
cable and all of the transformers connected to it.
An object of this invention is to provide a
switch for connecting a powerv source to the‘
25 windings of an electrical apparatus or to ground
and for_disconnecting them therefrom while pro
viding for preventing the operation of the switch
to its ground position when the apparatus is
energized, although permitting free movement of
30 the switch between the apparatus and discon
nectposition. when the apparatus is connected
to and energized only by the power source.
This invention'together with other objects will
be better understood from the following descrip
- 'tion when taken in conjunction with the accom
low voltage windings H and I2 is connected by
‘means of a circuit breaker or line switch l3 to
the three conductors I4, I5 and i6 of a low volt
age three-phase circuit or network system. The
high-voltage windings I‘! and 18 of the trans- 5
former ID are connected through a three-phase
grounding switch, shown generally at l9, to high
voltage feeder conductors 20, 2| and 22 and
through the circuit breaker 23 to a high voltage
power source, not shown. Asillustrated, the line 1O
switch l3 also carries an auxiliary switch mem
ber 24 for connecting certain of the operating
mechanism of the grounding switch I!) in circuit
with the low voltage three-phase circuit or net
work system when the line switch I3 connects 15
the transformer ID to- the network system, as
hereinafter described.v
_
In this embodiment the actuating mechanism
and switch members of the grounding switch I9
are disposed in the enclosing case 25, as shown in 20
Figs. 1 and 2. The enclosing case 25 is suitable
for mounting on the case 26 of a transformer,
as shown in Fig‘. 2, or on a wall. Where it is
desired to immerse the switch members and
operating mechanism of the switch in oil or other 25
suitable dielectric, the case 25 may be so fabri
cated as to be leak proof. In this type of struc
ture, a valve, not shown, of suitable construction
is usually carried in the bottom of the case for
withdrawing the dielectric from the case.
30
In the embodiment illustrated, the grounding
switch. I9 is provided with a multiple pole switch
member 21, each member of which is carried in
a bushing 28 whichis suitably mounted on a
bushing bridge 29.
The ends of the bushing
panying drawing, in which:
bridge 29 are attached in a suitable manner to
Figure 1 is an elevational view partly in sec
tion of a grounding switch and its operating
mechanism disposed within a suitable switch
~racks 30 and 3|, respectively, the'racks being so
40 casing, the front cover of which is shown re
moved,
Fig. 2 is-a sectional view taken along the line
II-II of Fig. 1, showing a portion of the operat
ing mechanism and the switch, a part of which
45 is broken away in the illustration; and,
Fig. 3 is a schematic view illustrating a three-, ’
' phase transformer, its primary and secondary
circuits and a three-phase grounding switch con
nected in one of the circuits.
This invention is illustrated as embodied in
50
a circuit in which it is desired to protect an
electrical apparatus such as a transformer.
Referring to the drawing and to Fig. 3 in par
ticular, this invention is illustrated as‘applied
55 to a circuit in which a transformer I!) having‘
mounted in guides, not shown, in the case that _
they are disposed for reciprocating movement
when actuated, as hereinafter described.
As illustrated in Fig. 2, the lower end of each
member of the multiple pole switch member 21
is provided with a terminal 32 disposed to sliding
ly engage a transformer terminal contact mem
ber 33 which is carried by an insulating bushing 45
34.
In order to support the bushings 34 and
the contact members 33,‘the bushings are. car- v
ried by a bushing bridge 35, the ends of which
are bolted or otherwise permanently attached
to the walls of the case 25. A conductor strap
36 is provided for connecting each of the contact
members 33 through the terminal bushing 31
disposed to extend through the transformer case
26 to the windings H and 18 of the transformer.
The upper end of each member of the movable 55
3
2,134,560
by the armatures 59 and‘ 64, respectively, are
withdrawn from the slot and openings in the gear
disk 41. The movable switch members 21 may
then be moved to the ground position by actuating
the shaft 49 by any suitable means, such as by
an operator’s handle, not shown, to cause the gear
disk 41 to rotate in a counter-clockwise direction
to actuate the racks 30 and 3! to cause the mov
able switch assembly 21 to move in a vertical
10 direction to the desired position.
As the movable
switch member 21 is actuated to its ground posi
tion, it is noted that the contact members 38
carried by each of the members of the movable
switch assembly maintain their sliding engage
15 ment with their associated elongated line termi
nal contacts 39.
For the purpose of explaining the operation of
the grounding switch of this invention, it may be
assumed that the movable switch assembly 21 is
20 in its disconnect or open position, in which posi
tion it does not bridge a plurality of contacts or
close a circuit. With the multiple pole switch
member 21 in this position, if it is desired to
ground the power line, the shaft 49 may be ro-V
25 tated in a counter-clockwise direction to cause a
movement of the switch member 21 in a vertical
the movable switch members 21 and their associ
ated transformer terminal contact members 33,
line terminal contact members 39 and ground
contact members 45 are so positioned that the
movable switch members 21 must move progres
sively from an open position through transformer
position to the ground position. Positive means
are thus provided for insuring movement of the
switch members 21 ‘to the transformer position
before being actuated to the ‘ground position. Al 10
though not illustrated the operating handle
usually provided on the shaft 49, carrying the
gear disk '41, is provided with means for securing
a positive stop of the operating mechanism in the
transformer position. This provides a time ele 15
ment in which the windings of interlocks 55 and
56 may be energized if the transformer i0 is con
nected to the power line or to the conductors of
the network system.
'
It is thus evident that with the grounding 20
switch of this invention the feeder cannot be
grounded until after the transformer is deener
gized or disconnected from the network system.
It is further evident that the desired movement
of the movable switch assembly to the trans 25
former position before entering ground position
direction toward its groundrposition, as explained‘ from a disconnect or open circuit position is at
hereinbefore. If, however, the circuit breaker 23 tained without the aid of mechanical interlocks.
Further advantages are obtained in the ground
should be closed when the switch member 21 is in
ing switch of this invention in that a free move 30
30 the open position, then the switch member 21
ment of the movable switch members between the
could be actuated to only the transformer posi
transformer and open positions is obtained when
tion since the energized interlock with its in
wardly turned end 6! in the slot 52 prevents the transformer is connected only to the power
movement beyond the transformer position, as line, thus permitting inspection of the trans 35
explained hereinbefore. If, in addition to the former without necessitating the deenergization
circuit breaker 23, the line switch I3 is also closed of the feeder cable and all of the transformers
to connect the transformer to the conductors of connected to it. It is thus possible when the line
the network system when the switch member 21 switch connecting the transformer to the net
is in the open position, )then the interlock 55 is work system is in the open position toactuate the
switch members between the transformer and
4:0 so energized that the inwardly turned end 66 of
its armature 64 enters the opening 54 to prevent open positions regardless of whether the feeder is
energized, and to actuate the switch members
movement of the gear disk from the open posi
tion.
By reason of the plurality of interlocks 55 and
56, it is seen that movement of the switch mem
bers 21 to either the open or the ground position
is prevented when the switch member is in the
transformer position and the line switch i3 and
the circuit breaker 23 are closed. However, if line
switch I3 is open and circuit breaker 23 only is
closed to energize the transformer in. then the
interlock 55 only is energized to limit the move
ment of the gear disk 41. Because of the shape
of the slot and its position in the gear disk, as
explained hereinbefore, free movement of the
switch member 21 may be had when the trans
former II! is connected only to the power line to
permit movement of the switch member between
the transformer and open position and reverse
60 only. The switch member may be moved from
the transformer to the open position without seri
ous damage to the contacts since the only current
to be opened is the magnetizing current in the
transformer. Although not illustrated, it is de
sirable to provide a suitable quick-break mecha
nism in conjunction with the transformer ter
minal contacts 33 to aid in opening the circuit as
the switch members 21 move to the open position.
Further movement of the switch members 21
70 from the transformer position to the ground po
sition may be had only after circuit breaker 23
and line switch l3 are opened to deenergize the
transformer l0 and the windings of interlocks 55
and 56.
As illustrated in Figs. 1 and 2 of the drawing,
from transformer position to ground position,
provided the transformer I0 is disconnected from
the power line. With the grounding switch of 45
this invention it is. therefore, possible to move
the switch members to the open position, open
ing the magnetizing current of the transformer
but preventing movement of the switch members
50
to open the load current.
Although this invention has been described
with reference to a particular embodiment there
of, other and various modi?cations are possible.
It is, therefore, not to be restricted except insofar
as necessitated by the prior art and the scope of 55
the appended claims.
I claim as my invention:
.
1. In a grounding switch interposed between a
power line and transformer and associated with
a. line switch provided for connecting the trans
60
former to a network system in combination, a
multiple pole switch member disposed to be actu=
ated progressively to the positions open, trans
former and ground and reverse, means operable
with the switch member and responsive to the 65.
energization of the transformer for limiting the
movement of the switch member to the trans
former and open positions when the transformer
is connected only to an energized power line,
and means operable when the line switch con 70
nects the transformer to the network system for
locking the switch member against movement.
2. In a grounding switch interposed between a
power line and transformer and associated with
a line switch provided for connecting the trans
2,184,560
former to a network system in combination, a
multiple pole switch member disposed to be actu
ated progressively to the positions open, trans
former and ground and reverse, means operable
with the switch member and responsive to the
energization of the transformer when the trans
former is connected only to an energized'power
line for permitting free movement of the switch
member between transformer and open positions
10 but preventing movement of the switch member
from transformer to ground positions, and means
operable when the line switch connects the trans
former to the network system for locking the
switch member against movement.
15
3. In a grounding switch interposed between a
power line and transformer and associated with
a' line switch provided for connecting the trans
former to a network system in combination, a
multiple pole switch member disposed to be actu
ated progressively to the positions open, trans
enter the slot and prevent the movement of the
switch member from the transformer position to
the ground position while permitting free move
ment of the switch member between the trans
former and open positions, and means operable
when the line switch connects the transformer to
the network system for cooperating with the disk
to lock the switch member against movement.
6. In a grounding switch interposed between a
power line and transformer and associated with 10
a line switch provided for connecting the trans
former to a network system in combination, a
multiple pole switch member disposed to be actu
ated progressively to the positions open, trans
former and ground and reverse, means operable
with the switch member and responsive to the
energization of the transformer for limiting the
movement of the switch member to the trans
former and open positions when the transformer
is connected only to an energized power line,
said means comprising a disk having an elongat
former and ground and reverse, a disk having a
plurality of openings therein associated with the ed slot extending from the open position to the
switch member, means responsive to the energi , transformer position when the switch member
zation of the transformer when the transformer is in the transformer position and an electromag
25 is connected only to an energized power line dis
netically controlled pin associated therewith re
posed to enter one of the openings in the disk for
sponsive to the energization of the transformer
. cooperating with the disk to permit free move
when connected only to an energized power line
ment of the switch member between transformer to enter the slot and prevent the movement of
and open positions and to prevent movement of the switch member from the transformer position
the switch member from transformer to ground to the ground position while permitting free 30
positions, and means operable when the line movement of the switch member between the
switch connects the transformer to the network transformer and open positions, the disk also
system for cooperating with the disk to lock the having openings therein at each of the trans
switch member against movement.
former and ground positions when the switch
4. In a grounding switch interposed between a member is in the open position, and means oper
power line and transformer and associated with
able when the line switch connects the trans
a line switch provided for connecting the trans
former to the network system for entering any
former to a network system in combination, a one of the slots or openings in the disk depending
multiple pole switch member disposed to be actu
upon the position of the switch member for coop
40 ated progressively to the positions open, trans
erating therewith to lock the switch member
former and ground and reverse, a disk having a against movement.
plurality of openings therein associated with the
7. In a grounding switch interposed between
switch member, means responsive to the energiza
a power line and transformer and associated
tion of the transformer when the transformer is with a line switch provided for connecting the
45 connected only to an energized power line dis
transformer to a network system in combination,
posed to enter one of the openings in the disk a multiple pole switch member disposed to be
for cooperating with the disk to permit free move
actuated progressively to the positions open,
ment of the switch member between transformer transformer and ground and reverse, means op
and open positions and to prevent movement of erable with the switch member and responsive
50 the switch member from transformer to ground to the energization of the transformer for limit
positions, and means disposed to be energized ing the movement of the switch member to the
when the line switch connects the transformer transformer and open positions when the trans
to the network system to enter any one of the . former is connected only to an energized power
openings in the disk depending upon the position line, said means comprising a disk having an
of the switch member to lock the switch member elongated slot extending from the open position
against movement.
_to the transformer position when the switch
5. In a grounding switch interposed between a member is in the transformer position and an
power line and transformer and associated with electromagnetically controlled pin associated
a line switch provided for connecting the trans
therewith responsive to the energization of the
60 former to a network system in combination, a transformer when connected only to an ener
multiple pole switch member disposed to be actu
gized power line to enter the slot and prevent
ated progressively to the positions open, trans
the movement of the switch member from the
former and ground and reverse, means operable transformer position to the ground position while
with the switch member and responsive to the permitting free movement of the switch member
65 energization of the transformer for limiting the between the transformer and open positions, the 65
movement of the switch member to the trans
disk also having openings therein at each of the
former and open positions when the transformer transformer and ground positions when the
is connected only to an energized power line, said switch member is in the open position, and means
means comprising a disk having an elongated slot comprising an electromagnetically controlled pin
70 extending from the open position to the trans
operable when the line switch connects the
former position when the switchamemberr-is in ‘transformer to the network system for entering
the transformer position and an electromagneti
any one of the slots or openings in the disk de
cally controlled pin associated therewith respon
pending upon the position of the switch member
sive to the energization of the transformer when for cooperating therewith to lock the switch
connected only to an energized power line to member against movement.
75
5
2,184,560
8. In combination, a transformer, a power line,
a grounding switch interposed between the power
line and the transformer, a network system, a
line switch disposed for connecting the trans
former to the network, the grounding switch
being also associated withthe line switch, the
grounding switch comprising a multiple pole
switch member having an open, transformer and
ground position and being disposed to be actu
10 ated progressively to said positions and reverse,
means operable with the switch member and re
sponsive to the energization of the transformer
for limiting the movement of the switch mem
ber to the transformer and open positions when
15 the transformer is connected only to an ener
gized power line, and means operable when the
line switch connects the transformer to the net
work system for locking the switch vmember
against movement.
9. In combination, a transformer, a power line,
20
a grounding switch interposed between the power
line and the transformer, a network system, a
10. A grounding switch comprising, in combi
nation, a multiple pole switch member having
an open, transformer and ground position, means
associated with the switch member for actuating
it progressively to said open, transformer and
ground positions and reverse, and a plurality of
means associated with said actuating means for
controlling its operation in a predetermined man
ner, one of said plurality of means disposed to
be actuated under predetermined electrical con
10
ditions to engage said actuating means for so
cooperating therewith as to permit free move
ment of the switch member between the trans
former and open positions but to prevent move 15
ment of the switch member from transformer
to ground position, another of said plurality of
means disposed to be actuated under certain
other predetermined electrical conditions for co
operating with the actuating means to lock it 20
against movement thereby preventing movement
of the switch member.
11. A grounding switch comprising, in combi- '
line switch disposed for connecting the trans
former to the network, the grounding switch‘ nation, a multiple pole switch member having
25 being also associated with the line switch, the an open, transformer and ground position and 25
grounding switch comprising a multiple pole being disposed to be actuated progressively to
switch member having an open, transformer
said positions and reverse, a disk having a plu
and ground position and being disposed to be
rality of openings therein associated with the
switch member, means disposed to be actuated
under predetermined conditions to enter one of 30
the openings in the disk for cooperating there
with to permit free movement of the switch
member between transformer and open positions
and to prevent movement of the switch member
from transformer to ground position, and means 35
disposed to be actuated under certain other pre
determined conditions for cooperating with the
disk to lock the switch member against move
ment.
actuated progressively to said positions and re
30 verse, means operable with the switch member
and responsive to the energization of the trans
former when the transformer is connected only
to an energized power line for permitting free
movement of the switch member between trans
35 former and open positions but preventing move
ment of the switch member from the transformer
to ground positions, and means operable when
the line switch connects the transformer to the
network system for locking the switch member
40 against movement.
.
HENRY H. KERR.
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