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Dec. 17, 1946-
E. A. THQMPsQN p
HIGH VOLTAGE PROTECTIVE LINK
Filed Aug’. 26, 1942 ‘
3 Sheets-Sheet l
' 10
p,.
f5’
WITNESSES:
lNVENTOR
5702/; A. Thompson.
72M. 4.
BY
ATTORNEY
Dec. 17, 1946."
2,412,926
E. A. THOMPSON
HIGH VOLTAGE PROTECTIVE LINK
Filed Aug. 26, 1942
3 Sheets-Sheet 2
WITNESSES: -
EAMWALL
77w 4. gw
INVENTOR
Elvin A. Thompson.
BYi
gNEY
ATI'OR
;
Dec. 17, 1946.
2,412,926
E. A. THOMPSON
HIGH VOLTAGE PROTECTIVE LINK
Filed Aug. 26, 1942
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INVENTOR
Elvin A; Thompson.
BY
.
. MATTO
if???
Patented Dec. 17,1946
2,412,926
UNITED STATES PATENT OFFICE
2.412328
HIGH VOLTAGE PROTECTIVE LINK
Elvin A. Thompson, Sharon, Pa., assignor to
Westinghouse Electric Corporation, East Pitts
burgh, Pa., a corporation of
Application August 26, 1942, Serial No. 458,210
6 Claims.
.
(01. 200-120)
l
2
The invention relates generally to electrical ap
paratus such as transformers, and more particu
Fig. 2 is a top plan view of the apparatus;
Fig. 3 is a vertical sectional view or the pro
tective device that is mounted in the cover of
larly, to such apparatus provided with protective
devices within the apparatus casing for interrupt
ing the power circuit through the apparatus when
subjected to predetermlned‘electrical conditions.
Inelectricai apparatus, such as polyphase power
‘transformers, it has become customary practice
the electrical apparatus;
,
Fig. 4 is an enlarged sectional view taken along
the line ‘IV-IV of Fig. 3; and
'
Fig. 5 is an enlarged sectional view of a portion
of the device shown in Fig. 4.
to provide a fusible link or conductor in the high
Referring to the drawings, a tank or casing
voltage circuit positioned in the insulating ?uid 10 ii is provided having a cover it’ and which may
of the apparatus for interrupting the connection ' include a compartment H for containing'a, main
of the apparatus to the high voltage circuit upon
power transformer, a compartment It for con
a short circuit of the transformer windings. Such
tainihg tap changing mechanism, and a com
a power transformer assembly is described in Pat
pertinent it for containing metering and control
ent 2,1Q8,489, issued to F. L. Snyder on April 23,, 15 mechanism, as well as other compartments such,
1940, and assigned to the same assignee as this
for example, as for containing a low voltage cir~
application.
cult breaker between the transformer windings
In such electrical apparatus, it has been cus
and the low voltage terminals of the apparatus.
tomary to mount the protective link device di
A lightning arrester i6 is shown mounted above
rectly on the lower end of the high voltage bush» 20 the cover of the apparatus having one terminal
ing below the top level of the insulating liquid
ll grounded on the apparatus casing and the
or to mount it On a separate support near the
upper terminal l8 connected to a high voltage
lower end of the high voltage bushing. When
circuit conductor it) which is connected also to
the fusible conductor of such a protective device
the terminal stud 2! of a high voltage bushing
is fused to interrupt the circuit, it is necessary
22, the lower end 23 of which is connected through
to replace the fused conductor, and in order to
terminals 2t and 25 of a protective device it
.do this, it has been necessary to lower the level
to the winding terminals ill of a main power
of the insulating liquid within the apparatus cas
transformer 28. As shown in Fig. 2, there will
ing suiiiclently below the level of the protective
be three lightning arresters and three high volt
device as to permit a person to enter the casing
through a manhole in the cover of the apparatus
and replace the fusible conductor element. It
age terminal bushings 22 for a threemhase power
transformer, and likewise three low voltage ter
minal bushings Si having terminal studs
con“
nected
also to the
to low
low voltage
voltage circuit
lightning
conductors
arrestersthrough
is also frequently necessary to remove the high
voltage bushing from its mounting in order to
apply the protective link.
35 which power is supplied from the apparatus.
It is an object of the invention to provide a
protective device for use in apparatus of the
Manhole covers 313 are provided in the cover
it of the apparatus to permit workmen to enter
character described in which the protective den
the apparatus casing for necessary repairs and
vice may be removed and the fusible element re=
smaller covers
are provided, three in nuinicer.
viewed without the necessity of lifting the bush so directly behind each of the three high voltage
ing or of draining the oil below its normal level.
bushings
for providing access to the protec
It is a further object of the invention to pro»
tive devices 526 which devices are more clearly
vide a protective device for use in apparatus or"
shown in Figs.
l.‘- and 5.
.
the
described in which an operator lira-y
The protective device
includes a ?xed por»
remove the fused conductor and replace it with do tion permanently mounted within the apparatus
a new one without the necessity for entering the
and including a base
and a barrier or wall 8?
or casing of the apparatus.
of insulating material extending upwardly from
@ther objects
advantages of the invention
will be apparent from the following description‘
the base to a level 33 below the level of the oil
within the apparatus. The ‘carrier ‘wall
is also
oil a preferred embodiment of the invention, ref= 50 provided with openings 39 to permit the flow of
erence being had to the accompanying drawings,
the cooling and insulating ?uid in and about the
which:
parts of the protective device within the barrier
Figure l
a vertical sectional view of electri=
wall
The terminals 26 and 25 are mounted
cal apparatus to which my invention is applied
‘taken
the line
oi’ Fla. 2;
55
in the wall or barrier 3'] and provided on their
inner ends with flat vertically extend-1m contact.
2,412,926
3
members 4| for engaging contact members 42
mounted upon a movable portion of the protec
tive device which includes a cover or plate 43
normally supported below the manhole cover 35
in any suitable manner as by lugs 44, and provided
with a handle 45 for raising the plate 43 and the
movable portion of the device supported thereby
d
'
Modi?cations in the apparatus illustrated and
described may be made within the spirit of my
invention, and I do not wish to be limited other
wise than by the scope of the appended claims.
I claim as my invention:
,
1. In an electrical apparatus including a cas
ing having a liquid insulating medium therein,
a cover provided with an opening therein, insu
lating bushings mounted on and extending
manhole cover 35.‘
‘
through
the cover of the casing through which
10
Extending downwardly from the plate I13 are
from within the apparatus after removal of the
supporting members 46, here shown as four in
number, which are attached in any suitable man
ner to spacer members 41 shown at various levels
extend leads connecting the apparatus to line
circuit conductors, a protective device for the
electrical apparatus positioned within the cas
ing and mounted below the opening in the eas
along the vertical supporting members 56. Two
ing cover, said protective device including a base
of the vertical spacer members 46, as best shown 15 _ portion
and a tubular barrier wall member ex
in Fig. 4, serve as guide members ?tting within
tending upwardly therefrom and provided with
channels in guide members 58 extending‘ down
openings therein to permit the ?ow of the liquid
wardly within the barrier wall 31. Another of
insulating medium within the barrier wall, and
the supporting members d6 serves as a support for
guide members extending inwardly from the bar
the contact members 62 which serve as terminals 20 rier wallv to guide the removable portion against
of the removable portion of the device for con
rotation while permitting vertical movement
necting a fusible conductor 5| between the ter- '
thereof, a pair of ?xed contact members mounted
minals 25 and 25 of the‘ protective device when
on thebarrier wall, one connected to the inner
the movable portion 40 is in its normal illustrated
end of a circuit conductor supplying energy to
position. The protective device including the fu
the apparatus and one connected to the appa
sible conductor 5! may correspond in principle to
ratus, and means for supporting said fixed con;
that illustrated and described in Patent No.
tact members beneath the normal top level of
2,223,726, to J. K. Hodnette, issued December 3,
the liquid dielectric, and a removable portion '
1940,,and assigned to the same assignee as this
containing a fusible conductor, said removable
application. The fusible conductor 5| is shown 30 portion being insertable and removable through
attached between terminals 52 and 53 by set
the opening in the apparatus cover and having
screws 55 and 55 respectively, the upper terminal
slidable contact members adapted for engaging
52 being connected to the upper contact mem
the ?xed contact members for connecting the
ber 52 through a terminal head 56, conductor 57,
fusible conductor between the bushing terminal
35
and the lower terminal 53 being connected to the
and the apparatus terminal and positioning the
lower contact member 152 by a cable 58.
fusible conductor below the top level of the liquid
The fusible conductor element 5| is supported
dielectric.
from the upper plate 53 through vertical mem
2. In a casing containing an electrical trans
bers 5i which are connected in any suitable man
former
having high-voltage and low-voltage
ner as by a pin 62 to the terminal head 56. A 40 windings, and containing a liquid dielectric with
tube 63 of ?ber or other suitable material ex
in the casing in which the transformer is im
tends downwardly from the upper terminal 52
about the fusible conductor 5! for aiding in the
blowout characteristics of the are formed when
the device operates to interrupt the circuit in a
manner now Well known. The lower terminal
53 is mounted in a, piston 55 normally positioned
in a bore within a tubular member 65 of insu
lating material which may be supported from the
terminal head 56 through members 66 and 67.
When the current carried by the apparatus
exceeds the safe value su?iciently to cause the
fusible conductor Fat to fuse and draw an are
under the insulating liquid in which it is im
mersed, and having highwoltage insulating bush;
ings mounted on the cover of the casing through
which extend leads connecting said high“
voltage windings to high-voltage circuit can»
ductors, a protective device associated with '~
high-voltage circuit conductor including
eon“
ductor which will fuse when subjected to prede~
termined electrical conditions positioned within
the casing and mounted below an opening in the
apparatus cover below the top level of the liquid
dielectric, said protective device compri
tubular barrier wall permanently mounted with Q
in the apparatus casing beneath the top level of
the liquid dielectric and provided with a pair of
terminals, one terminal being connected to the
inner end of the bushing lead and‘the other
tubular member 65 so as to rapidly increase the‘
terminal being connected to the high-voltage
length of the arc which is extinguished in the
insulating liquid surrounding the fusible con 60 winding, and a removable portion containing the
fusible conductor insertable into the barrier
ductor.
through the opening in the apparatus cover and
When the fusible conductor 5| has melted and
having terminals therein for engaging the ter=
interrupted the circuit, a, similar fusible conduc
minals in the barrier wall for connecting the I
tor may be replaced by removing the manhole
fusible conductor between the high-voltage ter
cover 35 and lifting the entire movable portion
minal lead and the high-voltage winding and
of the protective device by the handle 45 from
positioning the fusible conductor below the top
. within the apparatus casing, causing the contact
level of the liquid dielectric.
,
members 42 to separate from the contact mem
3. In a casing containing an electrical ap
bers lil, Thus the entire structure positioned
within the vertical supporting members 46 is re 70 paratus, a liquid dielectric within the casing in
which the electrical apparatus is immersed and
moved from the apparatus permitting a. new fu
having insulating bushings mounted on and. ex
sible wire 5| to be inserted without the neces
tending through the cover of the casing through
sity of lifting the heavy high voltage bushings
which extend leads connecting the apparatus to
or draining the oil to permit a workman to enter
the casing of the apparatus.
‘ 75 line circuit conductors, a protective device for the‘
mersed, the gases produced by the arc cause the I
piston 65 that is attached to the end of the cable
58 to be rapidly ejected from the bore within the
2,412,928
6
electrical apparatus positioned within the eas
ing and mounted below an opening in the ap
paratus, said protective device comprising a ?xed
protective device including a ?xed portion
mounted within the casing and a removable por
tion cooperatively related thereto, said fixed por
portion permanently mounted within the ap
paratus casing and a removable portion, the ?xed
portion comprising a tubular barrier wall of in
tion including a base portion and a tubular bar
rier wall member extending upwardly therefrom
andprovided with openings therein to permit the
flow of the liquid insulating medium within the
barrier wall, and guide members extending in
wardly from the barrier wall to guide the re
movable portion against rotation while, per
mitting vertical movement thereof, a pair of ?xed
sulating material extending upwardly from a
supporting base and having an open upper end
terminating below the opening in the apparatus
cover at an elevation below the top level of the
liquid dielectric, guide members carried by said
barrier wall for governing the axial position of
contact members mounted on the ‘barrier wall,
the removable portion when inserted into the
one of said ?xed contact members being con
barrier, and ?xed contact members carried by
nected to the inner end of the bushing lead and
the barrier, the removable portion containing a 15 the other one of said ?xed contact members being
fusible conductor and having slidable contact
connected to the apparatus, and means for sup
_ members therein for engaging the ?xed contact
porting said ?xed contact members beneath the
members carried by the barrier for connecting
normal top level of the liquid dielectric, and a
the fusible conductor between the bushing ter
removable portion containing a fusible conductor,
minal and the apparatus terminal and position 20 said removable portion being insertable and re
ing the fusible conductor below the top level of
movable through the opening in the apparatus
the liquid dielectric, said removable portion hav
cover and having slidable contact members
ing' ‘guide ‘members for cooperating with
adapted for engaging the ?xed contact members
the guide members on the ?xed portion of the
for connecting the fusible conductor between the
, device for guiding the contact members into 25 bushing terminal and the apparatus terminal and
circuit closing positions.
I
for positioning the fusible conductor below the
4. In a casing containing an electrical trans
top level of the liquid dielectric, the removable
former having high-voltage and low-voltage
- portion having va plate member at its upper end ‘
windings, and containing a liquid dielectric with
and a plurality of pairs of vertical supporting
in the casing in which the transformer is im 30 members" extending downwardly therefrom, cer
mersed, and having high-voltage insulating bush
tain of which are positioned to cooperate with
ings mounted on the cover of said casing through
the guide members of the ?xed portion, and
which extend leads- connecting said high-voltage
means for supporting the fusible conductor from
windings to high-voltage circuit conductors, a
the plate member between opposite pairs of the
protective device associated with each high 35 vertical supporting members.
voltage circuit conductor including a conductor
6. In a casing containing a liquid dielectric and
which will fuse when subjected to predetermined
electrical conditions positioned within the casing
van electrical transformer immersed in the liquid
dielectric and having high-voltage and low
and mounted below an opening in the apparatus
voltage windings, a protective device associated
cover below the top level of the liquid dielectric, 40 with each high-voltage winding circuit conductor
said protective device comprising a tubular bar
_ including a conductor which will fuse when sub
rier wall permanently mounted within the ap
jected to predetermined electrical conditions
paratus casing beneath the top level of the liquid
positioned within the casing and mounted below
dielectric and provided with a pair of terminals,
an opening in the apparatus cover below the top
one terminal being "connected to the inner end - level of the liquid dielectric, said protective device
of the bushing lead and the other ‘terminal being
comprising a removable portion and a ?xed por
connected to the high-voltage winding, and a re
tion permanently mounted-within‘ the apparatus
‘ movable portion containing the fusible conductor
casing beneath the top level‘ of the liquid
insertable into the barrier through the opening in
dielectric and provided with a baseportion and a
the apparatus cover and having terminals there 50 tubular barrier wall member extending upwardly
in for engaging the terminals in the barrier wall
therefrom and provided with openings therein to
for connecting the fusible conductor between the
highs-voltage terminal lead and the high-voltage
winding and positioning the fusible conductor
permit the ?ow of the liquid insulating medium
within the barrier wall, and guide members ex
tending inwardly'from the barrier wall to guide
below the top level of the liquid dielectric, and .55‘ the removable portion against rotation while per
' guide members associated with said barrier wall‘
and said removable portion for positioning the
removable portion axially with respect to the bar
rier wall to insure engagement of the cooperat
'~ ing terminals carried by said'separableportion
of said protective device.
5. In an electrical apparatus including a cas-,i
ing having a liquid insulating medium therein‘, a
cover provided with an opening therein, insulat
, ing bushings mounted on and extending through
the cover of the casing through which extend
leads connecting the apparatus to line circuit
conductors, a protective device for the electrical
apparatus positioned within the casing and
mounted below an. opening in the apparatus, said 76
mitting vertical movement thereof, a pair of:
terminals,‘ one terminal mounted in the
barrier wall, one terminal being connected to a
circuit conductor and the other terminal being
connected to the high-voltage winding, said re
movable portion being insertable, into the casing
through the opening in the‘apparatus cover and
having terminals therein for engaging the ter
minals in the ?xed portion for connecting the
fusible conductor between the high-voltage ter
minal lead and the high-voltage winding and
positioning the fusible conductor below the to
level of the liquid dielectric.
.
nnvm A. 'rnomrson.v
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