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Патент USA US3033973

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May 8, 1962
D. 1. BOHN
3,033,963
MAGNETIC BLOWOUT FOR CIRCUIT BREAKERS
Filed March 18, 1960
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5 Sheets-Sheet 1
INVENTOR.
DON/1L0 I. Bah/N
BY
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ATTORNEY
May 8, 1962
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D. I. BOHN
3,033,963
MAGNETIC BLOWOUT FOR CIRCUIT BREAKERS
Filed Match 18, 1960
5 Sheets-Sheet 2
INVENTOR.
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May 8, 1962
3,033,963
D. l. BOHN
MAGNETIC BLOWOUT FOR CIRCUIT BREAKERS
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Filed March 18, 1960
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May 8, 1962
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MAGNETIC BLOWOUT FOR CIRCUIT-BREAKERS
Filed March 18, 1960
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3,033,963
D. l. BOHN
MAGNETIC BLOWOUT FOR CIRCUIT BREAKERS
Filed March 18, 1960
5 Sheets-Sheet 5
BY
Unite Stats
1
$033,903
Patented May 8, 1%62
2
operation and will further cause a unidirectional mag
3,033,963
netic ?eld to be generated throughout the blowout area for
causing the arc to be continuously elongated in the arc
Donald I. Bohn, Asheviile, N.C., assignor to I-T-E Cir
chute.
cuit Breaker Company, Philadelphia, Pa, a corporation
In the preferred embodiment of my invention, I con
of Pennsylvania
struct the blowout means of a pair of substantially U
Filed Mar. 18, 1960, Ser. No. 15,902
shaped ?at plates which are connected in parallel with
6 Claims. (Cl. 200-447)
each other and in series with the cooperating contacts
and positioned adjacent thereto. I have found that in
My invention relates to a novel magnetic blowout
means for circuit breakers and more speci?cally relates 10 using such a structure where a relatively small stamped
opening is placed within a relatively large ?at conductive
to a magnetic blowout structure for D.~C. circuit break
sheet, the plate will generate an extremely high magnetic
ers which is formed of a substantially ?at plate having a
?ux within the contacting area at the moment of contact
relatively small window therein and generates a unidirec
separation and during a relatively high rate of rise of
tional magnetic ?eld within the area through which the
are formed by separating circuit breaker contacts is moved " current through the plate; and further that the ?ux created
by the plate will be unidirectional through all areas of
wherein the magnetic ?eld is initially highly concentrated
arc motion when the arc is driven into its cooperating
at the contact area when the circuit breaker contacts begin
arc chute.
to separate. The application speci?cally is a continuation
It is to be noted that the invention is not to be con
in-part application of my co-pending application Serial
MAGNETEC BLOWUUT FOR QIRCUIT BREAKERS
No. 698,500 ?led November 25, 19577.
20 strued to the mere use of a stamping for the blowout coil.
This concept in itself is old and is shown, for example,
in US. Patent No. 2,200,070 to Armstrong et al.
The stamped blowout plate of the present invention
more speci?cally is provided with a relatively small win
25 dow in a relatively large area plate. In addition, the par
volts D.-C.
.
ticular con?guration of the stamped plate of the invention
Magnetic blowout structures for circuit breakers are
is such that the dimension from the opening or window in
well known in the art, and typical examples thereof are
the plate and in the direction in which the arc is to be
shown in US. Patents 2,381,637, 2,412,247 and 2,486,104,
moved is of substantially the same order of magnitude as
all of which are assigned to the assignee of the instant
invention. In general, these patents show a magnetic 30 is the diameter across the opening in this same direction.
I do not mean to be limited here to a case where these
blowout structure which comprises a pair of primary blow
two dimensions are equal to one another as is the case
out coils in parallel and a pair of secondary blowout coils
in the preferred embodiment of the invention, it being
also in parallel.
noted that some deviation is permissible. It is, however,
The primary blowout coils have a relatively small diam
eter and are positioned adjacent to the circuit breaker co 35 necessary that the dimension of the plate in the direction
of motion of the are be a substantial dimension whereby
operating contact area. The purpose of these primary
the plate operates initially as a small diameter coil and
blowout coils is to create a high initial magnetic ?ux
Circuit breakers of the type which may be equipped
with my novel blowout plate are typical high speed cur
rent limiting circuit breakers which can, for example, be
rated between 3,000 to 6,000 amperes at up to 1,000
adjacent to the cooperating contacts at the instant an arc
thereafter operates as a large diameter coil without the
is struck between the separating cooperating contacts, and
necessity for two individual coils and an arc transfer
thus create a strong initial force to drive the arc into an
arc chute means. However, once the arc travels above the
means for transferring current from the small diameter
coil to the large diameter coil.
As pointed out above, presently existing stamped coil
diameter of this ?rst blowout coil, it will encounter re
devices have been formed with their sole purpose being
verse ?ux tending to drive the arc back toward the contact
to replace the normally used wire conductor, such as a
area. This, of course, would prevent extinction of the
arc and could cause destruction of the circuit breaker and 45 wire having a circular cross-section, whereby the stamped
construction is highly economical and forms a rigid and
severe damage to the load protected thereby, as Well as
self-supporting coil. In these prior devices, however, the
the source feeding into the load.
concept has been to cut out substantially all of the internal
For this reason, a jump gap means is provided for
area of the plate and to leave merely the outer rim of the
causing current transfer from the ?rst blowout coil to the
second blowout coil which has a substantially larger diam 50 plate to serve as the conductor. That is to say, the
stamped coil is formed so that there is a relatively large
eter than the ?rst. This jump gap means operates when
area window in the surface of the plate as contrasted to
the initial are approaches the outer diameter of the ?rst
my small area window in the plate which leads to highly
blowout coil, and the magnetic ?eld for driving the arc
unusual and unobvious results.
up into the arc chute is thereafter generated by the second
More speci?cally, since there is a small opening in the
blowout means which has the relatively larger diameter.
plate relative to the plate area in the present device, an
Thus, the arc will move within a magnetic ?eld having
exceedingly intense magnetic ?eld will be generated in the
the same direction as did the magnetic ?eld of the ?rst
contact area at the instant of contact separation which is
blowout coil.
initiated by a fault current. A preferred theory to ex
This above type of structure has two disadvantages;
?rst, a relatively complex and expensive structure of a 60 plain this operation is that this intense magnetic ?eld is
generated since at the initiation of the fault and with a
?rst and second blowout coil is required; and, second, a
high positive rate of rise of current, the current density
jump gap means or transfer means for transferring current
from the ?rst blowout means to the second blowout means
in the cross-section immediately adjacent to the window
of the plate is high, while the current density in the outer
is required. As well as being a relatively costly structure,
65 periphery of the plate is relatively low at this time. This
it is readily seen that the system including the jump gap
is the equivalent of having a small diameter blowout coil
is susceptible to failure and requires continuous observa
which previously was provided for this purpose.
tion and maintenance.
As the arc is drawn by the separating contacts and
The primary object of my invention is to provide a
moved upwardly under the in?uence of the magnetic ?eld
novel magnetic blowout structure which, as in the case of 70 generated by the blowout plate, the rate of rise of current
the above-described structure, will provide a concentrated
in the arc decreases and begins to go negative as the arc
magnetic ?ux in the contact area upon initiation of contact
raises in the arc chute. With this change in the rate of
3,033,963
3
4
rise of current, the point of maximum current density in
the circular current path de?ned by the blowout plate also
moves upwardly along the arc. Thus, the magnetic ?eld
the current flow through the inner ?laments will be higher
than that through the outer ?laments and a relatively
strong local magnetic ?eld will be generated at the con
vfor controlling and elongating the arc remains unidirec
tact area adjacent these inner ?laments.
tional with respect to the arc and follows the arc upwardly
to ensure continued stretching and to prevent a reverse
motion of the arc downwardly as could be the case in
and the rate of change of current reverses and becomes
gap or are transfer means.
inner ?laments so that the magnetic ?eld at the area ad
When the arc current reaches its peak value, however,
negative, the current in any ?lament is proportional to the
other types of circuit breakers.
sum of the ?lament voltage v and the inductance of the
This is the equivalent of substituting a large diameter
?lament times the rate of change of current therethrough.
blowout coil for the previously operative small diameter 10 Therefore, the current in the outer ?laments having a
blowout coil and is done automatically and without jump
relatively high inductance will be greater than that of the
It is to be noted that this type of phenomenon will
jacent the outer portions of the plate will be increased.
happen to an extremely small extent in the stamped
This increase of ?eld strength occurs just at the time it is
blowout plates of the prior art wherein only a relatively 15 needed, since at this time, the arc has been stretched into
narrow rim is left because of the stamping of a relatively
the outer regions adjacent the outer ?lamentary circuits of
large window. Indeed, the same phenomenon would oc
the plate. Hence, in essence, my novel blowout plate
our in any typical'circuilar cross-section conductor. The
operates to generate a strong magnetic ?eld at the area in
effect, however, of the outwardly travelling high density
the blowout structure at which the arc is being conducted,
?lament of current is so small as to be of relatively no
the increase in the magnetic ?eld following the movement
use in the assistance of interruption of the are.
of the arc.
In the stamped plate proposed by the present invention,
however, the structure takes full advantage of this phe
It is to be noted that the above explanation of the opera
tion of my novel blowout structure presently appears to
be correct. However, other in?uences not described
nomenon by using a small area window and by providing
a relatively large dimension for the plate ?from the opening 25 herein and not presently understood may be operative in
in the plate and in the direction of motion of the arc.
achieving the novel and unexpected operation which has
Therefore, my novel structure has the advantage of the
been observed.
heretofore described double coil system which is the provi
According, an important object of my invention is to
sion of a relatively high magnetic ?eld at the moment of
contact separation, while still providing a unidirectional
?ux through the complete area of arc motion without the
provide a novel magnetic blowout means which creates a
unidirectional ?ux throughout a blowout area with an
requirement of a jump gap or current transfer means.
area.
initial high concentration of magnetic flux at the contact
A mathematical analysis of the above-noted operation
Another object of my invention is to provide a novel
magnetic blowout means for generating a unidirectional
of my novel magnetic blowout means ?follows when con
sidering the ?at blowout plate having an aperture therein 35 flux in a blowout area without the use of arc transferring
as forming an in?nite number of parallel connected cir
cuits. Each of these circuits has an inductance and
means.
A further object of my invention is to provide a simpli
?ed blowout means which is formed of a simple plate
which de?nes a circular current path.
adjacent the contacting area will have a smaller resistance 40
Another object of my invention is to provide a novel
and inductance than those further away from the contact
magnetic blowout means which is formed of a substantially
resistance determined in accordance with the length of
the particular path under consideration. Those circuits
ing area, in view of their smaller length.
Since each of the assumed circuits is connected in
parallel, the voltage drops across them will be equal to
U-shaped plate of conductive material.
A further object of my invention is to provide a novel
magnetic blowout means which provides a unidirectional
?ux throughout a blowout area wherein the concentration
of ?ux density is shifted from a central portion adjacent
one another and equal to the sum of the resistive voltage
drop plus the inductive vector voltage drop. Thus, the
voltage drop across any assumed ?lamentary circuit will
contacting area toward outer portions during the progress
of the lengthening of the are.
A further object of this invention is to provide a novel
11-41 +Ldt
'50 ?at plate blowout means which is formed of a plate hav
ing a relatively. small aperture therein to de?ne a rela
where
tively circular current path.
v is the voltage drop,
A further object of my invention is to provide a novel
?at plate blowout coil which is formed of a plate having
L and r are the inductance and resistance, respectively, of
a relatively small Window stamped therein wherein the
the ?lament,
dimension from the opening of the window and in the di
and
rection of the motion of an arc of the plate is of sub- '
i is the current through the ?lament.
stantially the same order of magnitude as is the dimension
From the above equation, it follows that the current
across the opening in the same direction.
through any ?lament is:
A still further object of this invention is to provide an
60
additional flat plate coil having a relatively small window
di.
opening which initially conducts current in the manner
be equal to:
_t)?-LEZ
of a small diameter coil and thereafter conducts current
in the manner of a large diameter coil without current
7.,
From the above relation, it is seen that the current 65 transfer means.
through the ?lament? circuits is proportional to the dif
Yet a further object of this invention is to provide a
ference in the voltage drop v across the ?lament, and the
novel ?at plate blowout coil having a small opening
inductance of thatv ?lament multiplied by the rate of
stamped therein which is characterized in initially operat
change of current therethrough.
ing upon theinitiation of a fault current and separation
When a fault condition appears on the protected line,? 70 of cooperating contacts as a small diameter blowout coil
there will be a very high positive rate of change of current.
The difference between the voltage across the ?lament and
the inductance multiplied by the rate of change of current
in the ?lament will be greater for those inner ?laments
having a smaller inductance. Hence, at this initial time,
a
and thereafter acts as a large diameter blowout coil with
out the requirement of current transfer means.
As was seen from the above, the essence of my inven_
tion is to provide a blowout means formed of a simple
stamped plate of conductive material. It will, however,
3,033,963
6
be apparent to those skilled in the art that other U-shaped
plates may be associated with the single plate in a manner
to the movable contact 36. Movable contact 36 is pivot
ally movable about pivotal support 33 responsive to rota
analogous to the use of a plurality of turns in a blowout
tion of beam member 34.
coil whereby the unidirectional ?ux density created by the
~
As will be seen by reference to the above noted patent,
the magnetic latch structure includes a coil operating
blowout will be increased.
It may be further desirable to position material having
means 46 and is operable in such a manner as to maintain
a relatively high magnetic permeability adjacent the con
the movable contact 36 in engaged position with respect
tacting area whereby the ?ux density at this area during
to stationary contact 42 against the force of a contact
initiation of contact operation may be increased. If de
opening
biasing spring 44. When the electrical energiz~
sired, this magnetic material could be incorporated into 10
ing structure of the magnetic latch means 32 is energized
the U~shaped conductive plate so as to form a unitary
in a predetermined manner, the latch structure will be de
feated, and spring 44 will drive movable contact 36 to a
member.
Accordingly, a still further object of my invention is
disengaged position with respect to stationary contact 42.
to provide a magnetic blowout formed of a plurality of
My novel blowout structure is seen in FIGURES 1
U-shaped plates connected in series with one another and 15
through
5 as comprising conductive plates 46 and 48,
de?ning a spiral path of more than one turn for current
?ow through said plates.
respectively (see FIGURE 5 for plate '48), which are
A still further object of this invention is to adapt my
novel U~shaped blowout plate with an insert of magnetic
positioned on either side of cooperating contacts 36 and
42.
It will be noted that for purposes of structural strength,
material adjacent the contact area which operates to con
centrate magnetic ?ux during the initial operation of the
20 the peripheral edges of the plates 46 and 48 are bent out
wardly to form ?anges, such as ?anges 50 and 52 of plate
46, and flanges 54 and 56 of plate 48 (see FIGURES 2
These and other objects of my invention will become
and 5). While the plates could be stamped from a unitary
apparent from the following description when taken in
sheet of conductive material, the plates 46 and 48 set
connection with the drawings in which:
25
forth herein have been formed of a ?rst and second con
FIGURE 1 shows a plan view of a D.-C. circuit breaker
ductive sheet, such as conductive sheets 58 and 60 for
employing my novel blowout means.
circuit breaker contacts.
blowout plate means 46, as may be best seen in FIGURES
FIGURE 2 is an exploded perspective view of my novel
2, 4 and 5. These sheets are mechanically and electri
I blowout structure in the circuit breaker of FIGURE 1.
FIGURE 3 is a side view of the arc chute structure of 30 cally fastened together in any desired manner and oper
ate in the exact manner that a single plate would operate.
the circuit breaker of FIGURE 1 which is associated with
The circuit breaker current path which includes my
my novel magnetic blowout means.
novel magnetic blowout structure is schematically illus
FIGURE 4 is a side view of my novel magnetic blow?
trated in FIGURE 6 as coming from a ?rst terminal point
out plate means.
FIGURE 5 is a top view of the magnetic blowout means 35 62, the substantially U-shaped blowout plates such as
blowout plates 46 and 48 (FIGURE 2), the stationary
of FIGURE 4 as used in the structure of FIGURE 1.
contact schematically indicated as stationary contact 64,
FIGURE 6 is a partially schematic view of the manner
the movable contact schematically indicated as movable
in which my novel blowout means is connected in circuit
contact 66 and pivotally mounted at pivot point 68, and
relation with respect to the circuit breaker cooperating
contacts.
40
FIGURE 7 is a side view of FIGURE 6 and particu
larly illustrates the distribution of the magnetic ?eld
created by my novel magnetic blowout means.
FIGURE 8 shows a second embodiment of my novel
invention wherein a second plate is added to the plate of
my novel invention to form the equivalent of a two-turn 45
coil.
FIGURE 9 is a side view of FIGURE 8.
FIGURE 10 shows a vfurther embodiment of my novel
invention in which a piece of magnetic material is inserted 50
in the conductive plate at the portion adjacent the co
operating contacts.
thence to a second terminal 74}.
Thus, my novel blowout means is connected in series
with the cooperating contacts of the circuit breaker. This
type of circuit connection is utilized in FIGURES 1, 2,
4 and 5 in the following manner: the input terminal is
shown as parallel connected terminals 72 and 74, respec
tively (FIGURE 5). Terminal 72 is connected to plate
46 by means of bolts 76 and 78, while terminal 74, seen
in FIGURE 5, is connected to plate 48 by means of bolts
80 and 82. The current path then follows the plates 46
and 48 in a substantially U-shaped path, and the ends of
plates 46 and 48 are connected to either side of contact
42. This is best seen in FIGURE 2 where bolt means
86 and 88 extend through and electrically connect plate
46 to stationary contact 42, while a pair of bolt members,
FIGURE ll is a side cross-sectional view of FIGURE
it) taken across the lines 11-11.
FIGURE 1 sets forth my novel blowout structure in 55 of which only bolt member 90 is visible, extend through
plate member 48 and stationary contact 42 to form the
conjunction with a D.-C. circuit breaker of the type set
forth in US. Patent No. 2,891,123 issued June 16, l959,
entitled ?High Speed Circuit Breaker,? to C. I. Clausing,
assigned to the assignee of the instant invention. Since
details of the circuit breaker construction have been fully 60
set forth in the above-noted patent, the ?reference to the
electrical connection to the stationary contact 42.
The stationary contact 42 is supported from a cradle
support 92 which is held in turn by member 93 (FIG
URES l and 5) which is fastened to terminals 72 and 74.
Cradle support 92 has protrusions 94 and 96 extending
noid mechanism 36, with the output of the toggle linkage
to the schematically indicated circuit of FIGURE 6.
therefrom to receive plate 98 in bolted relationship, plate
circuit breaker structure will be of a general nature, and
98 having the stationary contact 42 rigidly fastened
reference is made to the above-noted patent for further
thereto.
details with regard thereto.
In general, the circuit breaker structure of FIGURE 1 65 Hence, the current path in the structure of FIGURE 1
extends from the terminals 72 and 74, plates 46 and 48
includes a base member 20 which contains an operating
(FIGURE 5), stationary contact 42, movable contact 36,
mechanism seen generally at numeral 22 and supports the
and thence from movable contact 36 to lower terminal
contact mechanism and circuit breaker terminals from a
100 which is electrically connected to the movable con
support post 24. The operating mechanism more speci?
cally comprises a toggle linkage including links 26 and 70 tact 36. Therefore, it is seen that the structure of FIG
URES 1, 2, 4 and 5 forms an electrical circuit identical
28 which are operable from a plunger operated by sole
associated with a magnetic latch structure 32 which is
constructed to transmit the motion of the toggle linkage
to a pivotally mounted beam member 34 which is attached
75
In order to prevent accidental electrical contact be
tween the plates 46 and 48 and the movable contact struc
ture,'insulating sheets such as sheets 102 and 104 sur
round the left-hand portion of plate 46, as seen in FIG
8.
URE' 5.? In a similar mannenthe plate 48 is adapted
with similar insulating sheets 106 and 108.
FIGURE 3 shows the arc chutestructure which is used
in conjunction with the mechanism above described for
FIGURES 1, 2, 4 and 5. This structure is not shown
in the other ?gures for purposes of clarity. Arc chute
means 109 will contain arc plates (not shown) in the -
which I de?ne as showing, a stamped plate in which the
relatively small width rim left by the large stamped win
dow is not of the same order of magnitude and dimen
sion as is the window opening.
While FIGURES? 1 through 7 have shown my novel
invention in conjunction with a magnetic plate which
gives the effect of a single turn, it is to be noted that
my invention could be extended to a?plate structure hav
well-known manner which arcing plates will extend across
ing two or more turns. This is schematically indicated
the arc chute and have slots extending upwardly and into
the arc chute. These arcing plates are not shown in the 10 in FIGURES 8 and 9 where the single plates 46 and v{i8
of FIGURE 6 are connected to the terminal 62. The
?gure for purposes of clarity, but may be of any desired
other end of plate 46, however, instead of being directly,
type, such as those set forth in application Serial No.
connected to the stationary contact 64 of FIGURE 6,
557,509 ?led January 5, 1956, entitled ?Ceramic Arcing
is connected to one end of a second substantially U
Plate Assembly,? in the name of A. E. Stringfellow, as
shaped
plate 116, as indicated by the black dot in FIG
15.
signed to the assignee of the instant invention, and now
URE 8, while plate 48 is connected to a second U-shaped
abandoned.
plate 113 in a similar manner.
In order to guide the travel of the are which is created
In order to prevent short? circuiting between plates 46
upon separation of the cooperating contacts, a pair of
and H6 and 48 and 118, insulating sheets 120' and 122,
respectively, are interposed between the ?rst and second
movable contact 36 and stationary contact 4-2, respec 20
turns, as best seen in FIGURE 9. The other end of
tively, of FIGURE I extend up the length of the arc
plates M6 and 118 are then connected to the stationary
chute. The'arc runners will guide the arc in its upwardly
contact 64 which cooperates with movable contact66.
extending path when the arc is being stretched because
Accordingly, a ?rst and second turn are connected in
of the magnetic ?eld applied thereto, and the arcing plates
series
with the cooperating contacts 64 and '70, this type
containing restricted slotswilloperate to squeeze the arc
arc runners 110 and 112 which are associated with the
as it continues upwardly to thus achieve arc extinction
because of the squeezing and elongating of the arc.
It will ?be noted that arc chute means 109 has a slotted
ear member 114 extending therefrom which cooperates
with a relatively stationary pin member 115 which allows
thearc chute and blowout structure associated therewith
to be?rotated about pin 115? and with respect to the move
able contact structure to allow ease of maintenance of
the circuit breaker.
'
In operation, I have found that my novel blowout
structure as set forth in FIGURES 1 through 5, and as
schematically indicated in FIGURE 6, achieves the un
expected result of providing a concentrated magnetic ?eld
in the area of a contact during initiation of contact opera
tion, and thus initiation of the arc, and further provides
a continuously unidirectional ?eld throughout the area
of structure intensifying the magnetic ?eld during the
contact opening interval.
It is to be noted that this structure is achieved in FIG
URES 8 and 9 without the use of jump gaps and that
both coils are continuously connected in series. Further
more, this type of structure continues to yield the unex~
pected unidirectional magnetic ?eld described in FIG?
URE 7.
lI-have found that the initial magnetic ?eld created at
03 CR the instant of contact opening can be intensi?ed by pro
viding a relatively high permeability path for the gen
erated magnetic ?ux. This path can be supplied by
means of magnetic inserts 124 and 126 of FIGURES 10
and 11 which show the plates 46 and 48 of FIGURES 6v
It will be noted that
40 and 7 as adapted with these inserts.
the inserts I24 and 126 are fastened to the conductive
of the are chute region where it is necessary to have the
unidirectional magnetic ?eld to continue to drive the arc.
material of plates 4-6-and 48, respectively, in any, desired
manner so as to form a unitary structure.
_
- _
?
Since inserts I24 and 126 are positioned adjacent the
The magnetic ?eld created by my novel plate is sche~
contact area, the magnetic ?eld near the contact area at
matically indicated in FIGURE 7 which is a side view 45 the initiation of contact operation will be subtsantially,
of FIGURE 6 with the arrows indicating the direction
increased. Clearly, the same type of insert construction
of the magnetic ?eld.
could be utilized in conjunction with a plate structure?
A further advantage of my novel blowout which is
such as that set forth in FIGURES 8 or 9 where two
comprised of a substantially ?at plate is that a large sur
turns are utilized.
?
50
face for heat radiation is achieved. This will allow the
Although I have described preferred embodiments of
current rating of the blowout to be substantially increased
my novel invention, many variations and modi?cations
over that of a normal winding having the same current
will'now be obvious to those skilled in the art, and I
density.
prefer, therefore, to be limited not by the speci?c disclo
The essential distinction of the flat stamped plate form_
sure herein but only by the appended claims.
ing the blowout coil in FIGURES l-through 7 from prior 55
I claim:
stamped. coils of the type shown in the aforementioned
1. In a magnetic blowout structure for a circuit
US. Patent No. 2,200,070 to Armstrong et al. is-that the
breaker; said circuit breaker including a pair of cooper
area of the window opening is relatively small with re
spect to the total area of the plate before the window is
removed therefrom, In addition to this, the dimension
of the plate from the opening and in the direction of
motion of the arc is of the same order of magnitude as is
able contacts movable between an engaged and disen
gaged position; said cooperable contacts being respec
tively associated with are runner means for guiding an
are drawn by said cooperable contacts into an are ex
tinguishing means; 'a current conducting means for gen
the dimension of the opening.
erating a magnetic ?eld to drive said are into said are
Thus, in-FIGURE vl the dimension A of the plate from
extinguishing means; said current conducting means being
the window opening and in the direction of motion of 65 positioned adjacent said cooper-able contacts and being
the arc is substantially equal to the dimension B.which
connected, in series therewith; said current conducting
is the dimension across the window in the direction of
means being a substantially ?at plate having a central
motion, of the arc. Note that exact equality of dimen
opening therein for conducting current in at least a par~
sions A and B is not necessary, and there can be some
tially circular path; the area of said opening being rela
variation. By way of example, dimension A can be 70 tively small with respect to the surface area of said plate;
larger than dimension B, while, on the other hand, di
mension A can be somewhat less than dimension B.
Thus, I de?ne the relationship between these two dimen
sions?being of substantially the same order of magnitude.
This is to distinguish over the Armstrong type of device 75
said plate having a dimension from the said opening in
the direction of motion of said arc of the ?same order of
magnitude as the diameter across said opening.
2. In a magnetic blowout structure for a circuit
3,033,963
10
breaker; said circuit breaker including a pair of cooper
able contacts movable between an engaged and disen
same order of magnitude as the diameter across said
opening.
gaged position; said cooperable contacts being respec
5. In a magnetic blowout structure for a circuit breaker;
said circuit breaker including a pair of cooperable con
tacts movable between an engaged and disengaged posi
tively associated with are runner means for guiding an
are drawn by? said cooperating contacts into an are ex
tinguishing means; a current conducting means for gen
erating a magnetic ?eld to drive said are into said are ex
tion; said cooperable contacts being respectively associated
with arc runner means ?for guiding an arc drawn by said
cooperable contacts into an arc extinguishing means; a
tinguishing means; said current conducting means being
positioned adjacent said cooperable contacts and being
connected in series therewith; said current conducting
current conducting means for generating a magnetic ?eld
to drive said are into said are extinguishing means; said
means comprising a ?at plate having an opening therein
for de?ning a substantially circular path; the area of said
current conducting means being positioned adjacent said
cooperable contacts and being connected in series there
opening being relatively small with respect to the surface
with; said current conductive means being a ?rst and sec
area of said plate; said plate having a dimension from the
ond substantially ?at plate positioned on either side of
said opening in the direction of motion of said are of the 15 said cooperating contacts and having openings therein for
same order of magnitude as the diameter across said
de?ning substantially circular current paths therethrough;
opening.
said magnetic blowout structure generating a relatively
high magnetic ?eld at the area including said cooperating
3. In a magnetic blowout structure for a circuit
breaker; said circuit breaker including a pair of cooper
contacts when said cooperating contacts are disengaged;
able contacts movable between an engaged and disen
20 said magnetic blowout structure generating a unidirection
gaged position; said cooperable contacts being respec
al magnetic ?eld throughout the area in which an are
tively associated with arc runner means for guiding an
are drawn by said cooperable contacts into an are ex
tinguishing means; a current conducting means for gen
erating a magnetic ?eld to drive said are into said are 25
drawn by said cooperating contacts is moved when said
cooperating contacts are disengaged; the area of said open
extinguishing means; said current conducting means be
ings being relatively small with respect to the surface area
of their said respective plates; said plates having a dimen
sion from said opening in the direction of motion of
ing positioned adjacent said cooperable contacts and be
said are of the same order of magnitude as the diameter
ing connected in series therewith; said current conduct
across said opening.
ing means being a substantially ?at plate having a cen
6. In a magnetic blowout structure for a circuit breaker;
tral opening therein for conducting current in at least 30 said circuit breaker including a pair of cooperable con
a partially circular path; said magnetic blowout struc
tacts movable between an engaged and disengaged posi
ture generating a relatively high magnetic ?eld at the
tion; said cooperable contacts being respectively associat
area including said cooperating contacts when said co
ed with are runner means for guiding an are drawn by
operating contacts are disengaged; the area of said open~
said cooperable contacts into an arc extinguishing means,
ing being relatively small with respect to the surface area 35 a current conducting means for generating a magnetic
of said plate; said plate having a dimension from the said
?eld to drive said arc into said are extinguishing means;
opening in the direction of motion of said are of the
said current conducting means being positioned adjacent
same order of magnitude as the diameter across said
said cooperable contacts and being connected in series
opening.
therewith; said current conducting means comprising a
4. In a magnetic blowout structure for a circuit breaker; 40 ?at plate having an opening therein for de?ning a sub
said circuit breaker including a pair of cooperable con
stantially circular path; the ?area of said opening being
tacts movable between an engaged and disengaged posi
relatively small with respect to the surface area of said
tion; said cooperable contacts being respectively associat
plate; said plate having a dimension from the said opening
ed with arc runner means for guiding an are drawn by
in the direction of motion of said are of the same order
said cooperable contacts into an arc extinguishing means; 45 of magnitude as the diameter across said opening; said
a current conducting means for generating a magnetic
plate portion ?adjacent said cooperating contacts being
?eld to drive said are into said are extinguishing means;
associated with a member of magnetic material.
said current conducting means being positioned adjacent
said cooperable contacts and being connected in series
therewith; said current conductive means being a ?rst 50
and second substantially ?at plate positioned on either
side of said cooperating contacts and having openings
therein for de?ning substantially circular current paths
therethrough; the area of said openings being relatively
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,996,112
2,147,430
Jensen et :al. __________ __ Apr. 2, 1935
Ellis et a1 _____________ __ Feb. 14, 1939
588,261
888,694
France ______________ __ Jan. 28, 1925
France ______________ __ Sept. 13, 1943
FOREIGN PATENTS
small with respect to the surface area of their said re- 55
spective plates; said plates having a dimension from said
opening in the direction of motion of said are of the
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