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Патент USA US2107947

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Feb. 8, 1938.
'
w.‘ V.'JEFFS
2,107,947
ELECTRIC SWITcH GEAR
Filed Jan: '18, 1937
2 Sheets-Sheet 1
[Tn/enter":
WHliam V- J FPS,
by
‘
His Atbo‘r‘vwey.
Feb. 8, 1938.
w. v. JEFFS
'
ELECTRIC
SWITCH
Fired Ja?. 18, 1957
‘ '
2,107,947
GEAR
'
V
‘
2 Shéets-Sheet 2
William v J {395,
H'is Attcnrney.
Patented Feb. 8, 1938
2,107,947
UNITED STATES PATENT OFFIQE
2,107,947
ELECTRIC SWITCH GEAR
William Victor Je?s, Eastcote, England, assignor
to General Electric Company, a corporation of
New York
Application January 18, 1937, Serial No. 121,194
In Great Britain January 31, 1936
5 Claims.
My invention relates to electric switchgear,
more particularly to selecting and isolating
switches for electric power circuits, and has for
its principal object the provision of an improved,
5 simpli?ed, compact and electrically e?icient
switchgear of the character above referred to.
When it is desired to connect a feeder‘ to a ring
main there is usually provided at the point of
connection. a selecting and isolating switch or
10 both by means of which the feeder can be con
nected selectively to either side of the ring main
at the point of connection or can be disconnected
therefrom while completing or not the circuit of
the ring main. It will be seen that three points
of connection are provided and the usual ar
rangement heretofore provided for such connec
tions has involved the use of a selecting and iso
lating switch or both, which may be oil-immersed,
if desired, and which comprised three: insulated
2Q conductors each connected to a switch blade, the
switch blades co-operating with a centrally
mounted insulating contact by means of which
the connections above noted could be made.
Where a polyphase circuit is under consideration,
25 the connections for each phase have been com
monly arranged in such a manner that the central
contact for each phase was mounted co-axially,
being supported upon a single insulator designed
to withstand the interphase potentials.
3,)
The present invention consists in providing a
construction in which the central insulator is
eliminated and according to the invention three
pivotally mounted switch blades are supported
upon the ends of the insulated conductors in such
a manner that each switch blade is adapted to
connect with a contact associated with the adja
cent insulated conductor.
Preferably the arrangement is such that the
insulated conductors each support a pivoted
4U switch blade and a contact adapted to be engaged
by the switch blade pivotally mounted upon one
of the adjacent insulated conductors, as by this
means a symmetrical arrangement may be adopt
ed. The switch blades are each provided with a
gs in
suitable actuating device which may comprise
a ?oating link pivotally connected at one end
to the switch blade and at the other end to a
crank arm carried by an operating shaft and
the connections to the operating shaft may be
50 arranged so that each switch blade can be actu
ated by manually, or otherwise operated handles
which are mounted close to one another, suitable
interlocking means being preferably provided to
ensure any given sequence of operations of the
55 switch blades.
(C1. 200-5 )
My invention will be more fully set forth in
the following description referring to the accom
panying drawings, and the features of novelty
which characterize my invention will be pointed
out with particularity in the claims annexed to 5
and forming a part of this speci?cation.
Referring to the drawings Fig. 1 is a sectional
end view 015 a three-phase selecting and isolating
switch embodying my invention and Figs. 2, 3 and
4 illustrate diagrammatically applications of the lo
invention.
The switch comprises a cylindrical casing l,
preferably ?lled with insulating oil and having
for each phase three insulated conductors 2, 3
and 4 respectively, each conductor being insu- l5
lated from the tank by a bushing 5. Each con
ductor at its inner and provides a pivotal support
for a movable switching blade 6 and also a con
tact 1 adapted to be engaged by the link mounted
on the next adjacent conductor viewed in a clock
wise direction. It will be evident that the blades
0
6 could be mounted on collars secured near the
ends of the bushings and connected electrically
to the conductors, although the arrangement ac
tually adopted is obviously simpler to construct.
The switching links are each provided with a
suitable actuating mechanism which may com
prise a link 3, a bell crank or similar lever B pivot
ally mounted on a shaft i 0 suitably journalled in
the casing and an actuating link indicated at l l. 3,1)
The insulated conductors are supported at an
‘
angle of 120° with respect to one another for the
phase indicated and converge toward the center
of the casing so that the switch blades are ar
ranged about a substantially equilateral triangle.
For the other phases, however, the upper bushings 5, 5a and 5b may have to be arranged in
staggered relation in order to obtain the neces
sary spacing between the outer ends of the con
ductors 4. To obtain the necessary separation
of the outer ends of the lower conductors the
lower bushings 5 may be arranged at an angle to
one another on the longitudinal axis of the tank I.
It will be seen that by operating the links 6 it
is possible to interconnect any two of the contacts ‘l at 2, 3 and 4 to interconnect all those con
tacts or to isolate all the contacts from one an
.i.»
u
40
45
other. It will be understood, of course, that it
will usually be necessary to provide suitable inter
locking arrangements which would prevent the 50
contacts from being interconnected in certain
conditions.
The actuating mechanism for the links H are
all arranged on the structure l2 arranged on the
upper side of tank I, suitable operating shafts 55
2
2,107,947
13 which are journalled on the structure 12 ex
at the end of certain of said bushings arranged
tending outside this structure and being operated
by external means (not shown).
adapted selectively to engage the contact ele
Figs. 2, 3 and 4 of the drawings show three
ways in which the improved isolator according
to the invention may be employed. In Fig. 2 a
transformer 39 may be connected to either of
so that the switch element of one conductor is
ment of an adjacent conductor.
2. Electric switchgear for isolating and con
trolling the connections between a plurality of
circuits comprising a casing containing an insu
switches, or by closing all three switches a- T
connection may be e?ected.
lating liquid, an insulating lead-in conductor
bushing for each of said circuits supported by
and extending within said casing generally in a 10
Fig. 3 shows an arrangement similar to Fig. 2
but in which a pair of the improved isolating
radial direction so as to converge towards the
center of said casing, and a pivoted switch ele
switches are employed with a circuit breaker 33
interconnecting two of the contacts of the isola~
tors. Transformers 35 and 3B are connected to
two other terminals of the isolators whereby an
arrangement is provided for a single breaker
ment and a contact element immersed in said
liquid and mounted at the end of each of said
bushings arranged so that the switch element of
one conductor is adapted selectively to engage
contact element of an adjacent conductor.
Electric switchgear for isolating and con
conductors 3! or 32 by closing the appropriate
sub-station employing two transformers.
Fig. 4 shows a further arrangement in which
two transformers 3'1, 38 can be connected to a
ring main 39 to which are connected three ieed~
ers M] by T-off connections, the ring main con~
nection between the isolators having a circuit
breaker All so that any portion of the ring main
can be cut out when desired and also that any
of the individual circuit breakers can be isolated without shutting down any other circuit
or reducing the protection on the complete sub
station.
'
In case it is desired to effect earthing oi the
circuits connected to the conductors 2, 3, ii, earth
contacts may be arranged within the tank ! and
supported directly on the tank wall the earth
contacts being so disposed that on operating the
switch blades 6 to an “earth” position, the outer
trolling the connections between three circuits
comprising an insulator for each circuit conduc 20
tor spaced approximately 1.20 degrees apart and
extending generally in a radial direction so as to
converge toward a common point, the converg
ing ends of said insulators forming substantially
an equilateral triangle, and a movable switch
element and a contact element mounted at the
end of each of said insulators arranged so that
the sv itch element of one circuit is adapted se
lectively to engage the contact element of an
30
4-. Electric switchgear for isolating and con
trolling the connections between three circuits
corn sing a substantially cylindrical metallic
casing containing an insulating liquid, an insu
lator for each circuit conductor supported by and 35
extending within said casing generally in a ra
adjacent circuit.
ends
contacts
of the
supported
blades make
on the contact
tank. in
with
thethe
arrange
dial direction so as to converge towards the cen
ment illustrated in Fig. 1, however, the earthing
is eiiected by the external earthing blades l4,
ter of said casing, the inner ends of said insu
lators de?ning a substantially equilateral tri
40 these blades for the lower conductors are mount
ed on shafts l5 and i5 which when rotated by
the mechanism H and I8 respectively cause the
angle, a pivoted switch blade and a ?xed con» 40
tact mounted at the end of each of said insu
blades on the respective shafts simultaneously to
connect the contacts l9 on the outer ends of the
lators, and operating means disposed exteriorly
of said casing for selectively actuating each
switch blade with respect to the ?xed contact
conductors to the tank. Owing to the upper con
of an adjacent insulator.
ductors not being in axial alignment a somewhat
different arrangement is adopted. In this case
the blades ill are each connected by links of
which 29 and ‘it only are shown to levers mount
ed on the operating shaft 22 by rotation of which
these blades can be simultaneously operated.
5. Electric switchgear for isolating and con
trolling the connections between a plurality of
While oil has been speci?ed as the insulatin 9.,
as to converge towards the center of said cas
ing, a movable switch element and a contact
fluid for ?lling tank ! other insulating liquids
e. g. carbon tetrachloride may be substituted.
What I claim as new and desire to secure by
Letters Patent of the United States is:
1. Electric switchgear for isolating and con
trolling connections between a plurality of cir
cuits comprising a casing, an insulating lead-i
60 conductor bushing for each of said circuits ex
tending within said casing so as to converge to
wards the center of said casing, and a movable
switch element and a contact element mounted
circuits comprising a metallic casing containing
insulating liquid, an insulating lead-in con
ductor bushing for each circuit conductor sup
ported by and extending within said casing so
element mounted at the end of each of said bush
ings arranged so that the switch element of one
conductor is adapted selectively to engage the
contact element of an adjacent conductor, and
a grounding switch mounted on and exteriorly
of said casing at certain of said bushings for
'I
selectively grounding the exterior ends of said (50
bushings.
VJILLIAM VICTOR J EFFS.
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