DESCRIPTION
[Title of the Invention]
ELECTROMAGNETICALLY ACTUATED SWITCHGEAR
5 [Technical Field]
The present invention relates to electromagnetically
actuated switchgear and more particularly to
electromagnetically actuated switchgear which opens or closes
a circuit breaker such as a vacuum circuit breaker using the
10 electromagnetic force of an electromagnetic actuator.
[Background Art]
In a vacuum circuit breaker as a kind of
electromagnetically actuated switchgear, there are casesthat
15 its vacuum interrupter has to be replaced due to specification
change or for maintenance.
However,theconventionalembeddedpolewhichconstitutes
a vacuuminterrupter has the following problem: when replacing
the vacuum interrupter, the shaft connected to the operating
20 mechanism for operating the embedded pole becomes an obstacle
to replacement work and the maintenance worker cannot reach
the bolts fixing the embedded pole.
For this reason, in order to replace the vacuum interrupter,
the shaft which becomes an obstacle to replacement work must
25 be removed. However, the shaft is fixed to the operating
mechanism and in order to remove the shaft, the operating
mechanism to which the shaft is fixed must be removed.
Furthermore, the operating mechanism is usually covered
by a case, so the case covering the operating mechanism must
5 be removed in order to remove the operating mechanism.
Therefore, for replacement of the vacuum interrupter,
the shaft, operating mechanism and case must be removed, which
is a time-consuming process.
Patent Literature 1 (Chinese Examined Utility Model
10 App1icationPub1icationNo.202678204specification)describes
fixing means to solve the above problem.
Patent Literature 1 illustrates that the bottom of an
embedded pole and a case covering an operating mechanism are
fixed with bolts through an intermediate fixing plate and
15 describes that the embedded pole can be removed from the case
by unfastening the bolts.
[Citation List]
[Patent Literature]
2 0 [Patent Literature 11 Chinese Examined Utility Model
Application Publication No. 202678204 specification
[Summary of the Invention]
[Technical Problem]
However, in the structure describedin Patent Literature
1 t h a t t h e embedded pole and case a r e f i x e d with b o l t s through
t h e i n t e r m e d i a t e f i x i n g p l a t e , a f i x i n g b o l t is p a s s e d t h r o u g h
a hole i n t h e i n t e r m e d i a t e f i x i n g p l a t e i n t o a n o n - p e n e t r a t i n g
hole i n a b o l t f i x i n g p a r t a t t h e bottom of t h e embedded pole
5 t o f i x them. This s t r u c t u r e has t h e following problem: s i n c e
t h e hole i n t h e b o l t f i x i n g p a r t does not p e n e t r a t e through
t h e b o l t f i x i n g p a r t a n d t h e fixingboltisnotcompletelypassed
t h r o u g h t h e b o l t f i x i n g p a r t ; w h e n s t r e s s i s g e n e r a t e d , a r u p t u r e
may occur i n t h e b o l t f i x i n g p a r t due t o d i f f e r e n c e i n modulus
10 of e l a s t i c i t y , so high r e l i a b i l i t y i s not ensured.
The p r e s e n t i n v e n t i o n h a s been made i n view of t h e above
circumstances and a f i r s t o b j e c t t h e r e o f is t o provide
e l e c t r o m a g n e t i c a l l y a c t u a t e d s w i t c h g e a r with an embeddedpole
fixedtoacasewithboltsthroughanintermediatefixingplate,
15 i n which t h e embeddedpole can be removed e a s i l y a n d t h e f i x i n g
r e l i a b i l i t y is improved.
A second o b j e c t of t h e p r e s e n t i n v e n t i o n is t o provide
e l e c t r o m a g n e t i c a l l y a c t u a t e d s w i t c h g e a r with an embeddedpole
fixedtoacasewithboltsthroughanintermediate f i x i n g p l a t e ,
20 inwhichtheembeddedpolecanberemovedeasilyandtherigidity
of t h e c o n t a c t s u r f a c e between t h e embedded pole and t h e
i n t e r m e d i a t e f i x i n g p l a t e is i n c r e a s e d .
[ S o l u t i o n t o Problem]
According t o one a s p e c t of t h e p r e s e n t i n v e n t i o n , i n o r d e r
25 t o achieve t h e f i r s t o b j e c t , t h e r e is provided
electromagnetically actuated switchgear which comprises an
operating mechanism including an electromagnet covered by a
case and located in the center of the case, the electromagnet
having a moving core and a fixed core facing each other and
5 a coil to make the moving core and the fixed core separate from
each other or come into contact with each other according to
an electromagnetic force, and a vacuum circuit breaker having
an embedded pole integrally ca.st with insulator, in which a
moving electrode and a fixed electrode facing each other are
10 made to separate from each other or come into contact with each
other by driving power derived fromthe electromagnetic force
generated by the electromagnet of the operating mechanism
through a link mechanism including a driving rod, a lever, and
an insulating rod. The embeddedpole is fixedtothe case with
15 fixingboltsthroughanintermediate fixingplate. Bolt fixing
holes are made in the intermediate fixing plate, bolt fixing
parts are provided in a way to cover the bottom periphery of
the embedded pole, holes similar to the bolt fixing holes are
made in the bolt fixing parts, and the fixing bolts are passed
20 through the bolt fixing holes of the intermediate fixing plate
and penetrated through the holes of the bolt fixing parts.
According to another aspect of the present invention,
in order to achieve the second object, there is provided
electromagnetically actuated switchgear which comprises an
25 operating mechanism including an electromagnet covered by a
case and located in the center of the case, the electromagnet
having a moving core and a fixed core facing each other and
a coil to make the moving core and the fixed core separate from
each other or come into contact with each other according to
5 an electromagnetic force, and a vacuum circuit breaker having
an embedded pole integrally cast with insulator, in which a
moving electrode and a fixed electrode facing each other are
made to separate from each other or come into conta-ct with each
other by driving power derived fromthe electromagnetic force
10 generated by the electromagnet of the operating mechanism
through a link mechanism including a driving rod, a lever, and
an insulating rod. The embeddedpole is fixed tothe case with
fixing bolts through an intermediate fixing plate. The
contactor side end and/or operating mechanism side end of the
15 intermediate fixing plate are folded up or down.
[Advantageous Effects of Invention]
According to the present invention, it is possible to
provide electromagnetically actuated switchgear with an
embeddedpole fixedtoa casewithboltsthroughanintermediate
20 fixing plate, in which the embedded pole can be removed easily
and the fixing reliability is improved.
It is also possible to provide electromagneticaIIy
actuated switchgear in which not only the embedded pole can
be removed easily but also the rigidity of the contact surface
25 between the embedded pole and intermediate fixing plate is
increased.
[Brief Description of Drawings]
F I G . 1 is a front view showing electromagnetically
5 actuated switchgear according to a first embodiment of the
present invention.
F I G . 2 is aplanview ofthe electromagnetically actuated
switchgear shown in F I G , I according to the present invention.
F I G . 3 is a right side view of the electromagnetically
10 actuated switchgear shown in F I G . 1 according to the present
invention.
F I G . 4 is a left side view of the electromagnetically
actuated switchgear shown in F I G . 1 according to the present
invention, including an auxiliary contact, display plate, and
15 counter.
F I G . 5 is a view taken from arrow 270 of F I G . 4.
F I G . 6A is a sectional view taken along the line A-A'
of F I G . 4.
F I G . 6B is a sectional view taken along the line B-B'
20 of F I G . 6A.
F I G . 6C is a sectional view taken along the line C-C'
of F I G . 6A.
F I G . 7A is a sectional view showing the intermediate fixing
plate fixing structure using a fixing bolt in a bolt fixing
25 part in a comparative example.
F I G . 7B is a sectional view showing the intermediate fixing
plate fixing structure using a fixing bolt in a bolt fixing
part in the present inventidn.
F I G . 8 i s a s e c t i o n a l v i e w s h o w i n g t h e i n t e r m e d i a t e f i x i n g
5 plate fixing structure using a fixing bolt in a bolt fixing
part at an operating mechanism side in the present invention.
FIG. 9 is a right side view showing electromagnetically
actuated switchgear according to a second embodiment of the
present invention.
F I G . 10 is a right side view showing electromagnetically
actuated switchgear according to a third embodiment of the
present invention.
[Description of Embodiments]
15 Next,electromagneticallyactuatedswitchgearaccording
to the preferred embodiments of the present invention will be
described referring to the accompanying drawings. In the
drawings that illustrate the preferred embodiments, the same
elements are designated by the same reference signs.
20
[First Embodiment]
F I G S . 1 to 4 illustrate electromagnetically actuated
switchgear according to the first embodiment of the present
invention.
2 5 As shown in these figures, the electromagnetically
a c t u a t e d s w i t c h g e a r a c c o r d i n g t o t h e f i r s t embodiment is
g e n e r a l l y s t r u c t u r e d a s follows: it has an e l e c t r o m a g n e t i c
a c t u a t o r ( o p e r a t i n g mechanism) 11 i n c l u d i n g a n e l e c t r o m a g n e t
1 4 , and a vacuum c i r c u i t breaker 32 i n c l u d i n g an embedded pole
5 228 (229, 230) i n t e g r a l l y c a s t with i n s u l a t o r , t o which t h e
d r i v i n g p o w e r d e r i v e d f r o m t h e e l e c t r o m a g n e t i c f o r c e generated
by t h e e l e c t r o m a g n e t 1 4 istransmittedthroughalinkmechanism
i.ncl.uding a d r i v i n g rod, l e v e r , and i n s u l a t i n g rod. The
embedded pole 228 is f i x e d t o t h e case 10 with f i x i n g b o l t s
10 t h r o u g h a n i n t e r m e d i a t e f i x i n g p l a t e 1 9 7 . Next, t h e switchgear
w i l l be d e s c r i b e d i n d e t a i l .
As shown i n FIGS. 1 t o 3, t h e e l e c t r o m a g n e t i c a c t u a t o r
11 i n c l u d e s a box t y p e c a s e 10 and t h e case 10 has an opening
12 on its f r o n t s i d e and a f r o n t cover ( n o t shown) i s detachably
15 a t t a c h e d on t h e f r o n t back s i d e of t h e case 10.
In t h e c e n t e r of t h e case 10, a c a p a c i t o r 16 is l o c a t e d
on one s i d e and a c o n t r o l board 18 i s l o c a t e d on t h e o t h e r s i d e
separatelyandindependentlywiththe e l e c t r o m a g n e t 1 4 between
them. The electromagnet 1 4 is f i x e d t o t h e case 10 with f i x t u r e s
20 173 ( b o l t s and n u t s ) through a r i b 172, t h e c a p a c i t o r 1 6 and
c o n t r o l board 18 a r e f i x e d t o t h e o p p o s i t e s i d e f a c e s of t h e
case 10 r e s p e c t i v e l y . S p e c i f i c a l l y , when t h e paper of FIG.
1 is f r o n t a l l y viewed, t h e c a p a c i t o r 16 is f i x e d on t h e l e f t
s i d e f a c e of t h e case 10 through a b e l t ( n o t shown) with b o l t s
25 and n u t s and t h e c o n t r o l board 18 is f i x e d on t h e r i g h t s i d e
face through a spacer 20 with bolts and nuts.
Inside the case 10, as shown in FIG. 4, an auxiliarycontact
34 to transmit the open or closed state of the vacuum circuit
breaker 32 to the outside, a display plate 36 to show that it
5 is in the open or closed state, and a counter 38 to count the
number of opening/closing motions are mounted on a plate 171
located above the capacitor 16 and fixed to the case 10.
22 denotes a secondary plug fixedly hooked to the top
of the case 10, and a power cable, a signal cable 28 from a
10 digital relay or analog relay and the like are connected to
the secondary plug 22. The signal cable 28 is connected to
the auxiliary contact 34 and control board 18 inside the case
10.
The control board 18 is supplied with power from the
15 secondary plug 22 and receives a closing command or opening
command (interruptingcommand) fromthedigitalrelayoranalog
relay. On the control board 18, a control logic section to
perform logical operation to control the driving of the
electromagnet 14, a charge/discharge circuit to charge or
20 discharge the capacitor 16, a relay to control the direction
ofenergizationofthe coil48, anda relaycontactaremounted.
Also, on the control board 18, a light emitting diode
50 to show completion of charge of the capacitor 16 is mounted
and also an "ON" pushbutton switch 52 to give a closing command
25 to the vacuum circuit breaker 32 by manual operation and an
"OFF" pushbutton switch 54 to give an opening command
(interrupting breaking command) to the vacuum circuit breaker
32 by manual operation are mounted.
Next, the electromagnet 14 will be described. As shown
5 in F I G . 3, theelectromagnet14 includes amovingcore 58, fixed
core 60, coil 48, shaft 62, two moving flat plates 64 and 66,
permanent magnet 68, cylindrical iron covers 70 and 72, iron
support plate 76, and fixed rod 78. The coil 48 is housed in
a coil bobbin 48a located between the support plates 74 and
10 76.
The shaft 62 is located vertically in the center of the
electromagnet 14 and the top of the shaft 62 is inserted into
a through hole 82 in the plates 64 and 66 and its bottom is
inserted into a hole 84 penetrating the support plate 76 and
15 a support plate 174. Consequently the shaft 62 can freely
slide up and down.
The moving core 58 and moving flat plates 64 and 66 are
fixed on the circumferential face of the shaft 62 with nuts
and a shaft (driving rod) 88 is connected to the bottom of the
20 shaft 62 through a pin (not shown) . The two moving flat plates
64 and 66 (lower larger moving flat plate 66 and upper smaller
moving flat plate 64) are attached to the shaft 62 in order
to provide the requiredmagnetic flux density and decrease the
mass of moving parts to reduce the requiredenergy for operation.
Furthermore, asupportplate 9 0 i s c o n n e c t e d t o t h e b o t t o m
of t h e s h a f t 62 and a ring-shaped i n t e r r u p t i n g s p r i n g 92 which
forms a c i r c l e around t h e c e n t e r of t h e s h a f t 62 is a t t a c h e d
between t h e support p l a t e 90 and a bottom p l a t e 80 (one end
of t h e i n t e r r u p t i n g s p r i n g 92 is a t t a c h e d t o t h e bottom p l a t e
5 8 0 ) . The i n t e r r u p t i n g s p r i n g 92 is intended t o give an e l a s t i c
f o r c e t o t h e s h a f t 62 through t h e support p l a t e 90 t o l e t t h e
moving core 58 l e a v e t h e f i x e d core 60.
The permanent magnet 68 i s l o ~ a t e d a r o u i ~ d t h e ~ ~ ocvoirneg
58 under t h e moving f l a t p l a t e 66 and t h e permanent magnet 68
10 is f i x e d on t h e t o p of t h e support p l a t e 74. The f i x e d core
60 is f i x e d on t h e support p l a t e 76 with b o l t s .
On t h e b o t t o m p l a t e 80, a s h o c k a b s o r b e r 1 9 0 a n d a s t o p p e r
191 supported by t h e bottom p l a t e 80 a r e l o c a t e d o p p o s i t e t h e
c a p a c i t o r 16 with r e s p e c t t o t h e permanent magnet 1 4 of t h e
15 bottom p l a t e 80. The s t o p p e r 191 is l o c a t e d n e a r e r t o a s h a f t
9 8 t h a n t h e s h o c k a b s o r b e r 1 9 0 . The s h o c k a b s o r b e r 1 9 0 i s f i x e d
through a nut 194 between it and t h e bottom p l a t e 80 and i t s
h e i g h t can be a d j u s t e d by t u r n i n g t h e nut 194.
The s t o p p e r 191 is f i x e d with a t h i n p l a t e 195 i n s e r t e d
20 between it and t h e bottom p l a t e 80 so t h a t t h e height of t h e
s t o p p e r 191 can be a d j u s t e d by changing t h e t h i c k n e s s of t h e
i n s e r t e d t h i n p l a t e 195.
T h e s h o c k a b s o r b e r 1 9 0 h a s a s p h e r i c a l a d a p t e r 1 9 2 l o c a t e d
o p p o s i t e t h e electromagnet 1 4 i n t h e h e i g h t d i r e c t i o n . The
25 s h a f t 98 has a l e v e r 193 r o t a t a b l y supported on t h e s h a f t 98
with the shaft 98 as the axis of rotation. The lever 193 comes
into contact with both the spherical adapter 192 and stopper
191 when the vacuum circuit breaker 32 is in the open state.
The upper surface of the lever 193 is formed so that in the
5 open state, it is parallel to the floor on which the vacuum
circuit breaker 32 is installed. The shock absorber 190 and
stopper 191 are locatedopposite the capacitor 16 (on the control
board 18 side) with respect to the electromagnet 14.
In other words, in this embodiment, the bottom plate 80
10 performs the function as an interrupting spring retainer for
fixing the interrupting spring 92, the function to support the
shock absorber 190, and the function to support the stopper
191. The centralaxis ofthe s h o c k a b s o r b e r 1 9 0 i s i n a l i g n m e n t
with the central axis of the electromagnet 14 in the depth
15 direction of the paper (FIG. 3) and the distance between the
shaft 98 extending in the depth direction of the paper and the
central axis ofthe shock absorber 190 is equal tothe distance
between the shaft 98 and the central axis of the electromagnet
14 (same distance) .
2 0 Therefore, the lever 193 which comes into contact with
the shock absorber 190 through the spherical adapter 192 can
have the same shape as the lever 96 connected to the electromagnet
14. In that case, the number of component types is decreased
andthemanufactureofcomponentsiseasier. Theelectromagnet
25 14 is fixed on the vacuum circuit breaker 32 side of the case
10 with fixtures (bolts and nuts) 173.
Furthermore, the bottom of the shaft 88 is connected to
a pair of levers 96 through a pin 94. The levers 96 are
constituent elements of the link mechanism to change the
5 direction of transmission of driving power derived from the
electromagnetic force generated by the electromagnet 14 and
supported on the shaft 98. Levers 100 are also supported on
the shaft 98. As the levers 96 rotate, the levers 100 also
rotate through the rotation of the shaft 98.
10 As shown in FIG. 4, a lever 186 is connected to an operating
rod 170 joined to the display plate 36 and the lever 186 is
supportedon the shaft 98. The lever 186 extends in the direction
opposite to the levers 100 with respect to the shaft 98. The
levers 100 are connected to an insulating rod 114 through a
15 pin 102.
As shown in FIG. 3, a wipe mechanism (not shown) to apply
contact pressure is built in the insulating rod 114 and the
top of the insulating rod 114 is connected to a moving feeder
conductor 122 attached horizontally through a flexible
20 conductor 121 and also connected to a moving conductor 124 of
the vacuum circuit breaker 32. The moving conductor 124 is
connected to a moving electrode 124A. A fixed electrode 12524
is located in a way to face the moving electrode 124A. The
fixed electrode 125A is connected to a fixed conductor 125.
25 These are housed in an insulating tube 126 constituting the
vacuum c i r c u i t b r e a k e r 32, t o g e t h e r with t h e moving e l e c t r o d e
124A. The i n s i d e of t h e vacuum c i r c u i t b r e a k e r 32 is maintained
a s a vacuum.
The f i x e d conductor 125 i s connected t o a f i x e d f e e d e r
5 conductor 129 which is a t t a c h e d h o r i z o n t a l l y , and t h e f i x e d
f e e d e r conductor 129 is connected t o an upper c o n t a c t 130 a s
a c i r c u i t b r e a k e r c o n t a c t o r . The moving f e e d e r conductor 122
is connected t o a lower c o n t a c t 132 a s a c i r c u i t b r e a k e r c o n t a c t o r .
Conductors f r o m a d i s t r i b u t i o n b o a r d a r e c o n n e c t e d t o t h e u p p e r
10 c o n t a c t 130 and lower c o n t a c t 132.
Thefixedfeederconductor129andmovingfeederconductor
122 a r e spaced i n t h e h e i g h t d i r e c t i o n , and t h e vacuum c i r c u i t
b r e a k e r 32, a r r a n g e d i n t h e h e i g h t d i r e c t i o n ( v e r t i c a l
d i r e c t i o n ) , makes e l e c t r i c a l connection between t h e s e
15 c o n d u c t o r s .
When t h e moving e l e c t r o d e 124A and f i x e d e l e c t r o d e 125A
i n t h e vacuum c i r c u i t b r e a k e r 32 come i n t o c o n t a c t with each
o t h e r , c u r r e n t flows and t h e f i x e d f e e d e r conductor 129 and
moving f e e d e r conductor 122 become e l e c t r i c a l l y conductive t o
20 each o t h e r . On t h e o t h e r hand, when t h e moving e l e c t r o d e 124A
l e a v e s t h e f i x e d e l e c t r o d e 125A (open s t a t e ) , t h e f i x e d f e e d e r
conductor129andmovingfeederconductor122 a r e d i s c o n n e c t e d .
In t h i s embodiment, a s shown i n FIG. 2, t h r e e c a p a c i t o r s
16 a r e combined t o provide a p r e s c r i b e d c a p a c i t a n c e . The
25 e l e c t r i c power s t o r e d i n t h e s e t h r e e c a p a c i t o r s 16 is s u p p l i e d
t o t h e c o i l 48 t o g e n e r a t e a magnetic f i e l d t o achieve t h e c l o s i n g
o p e r a t i o n o r opening o p e r a t i o n . The d i r e c t i o n i n which t h e
e l e c t r i c power s t o r e d i n t h e c a p a c i t o r s 16 a r e s u p p l i e d t o t h e
c o i l 48 is c o n t r o l l e d by t h e c o n t r o l b o a r d 1 8 .
5 In t h i s s t r u c t u r e , t h e space r e q u i r e d f o r t h e c a p a c i t o r s
is l a r g e r than when a s i n g l e c a p a c i t o r is used t o provide t h e
p r e s c r i b e d c a p a c i t a n c e , but t h e c a p a c i t o r s 16 may be s h o r t e r
i n h e i g h t , so s u f f i c i e n t space f o r maintenance i s a v a i l a b l e
above t h e c a p a c i t o r s 16, l e a d i n g t o improved s e r v i c e a b i l i t y .
10 Obviously t h e number of c a p a c i t o r s 16 is not l i m i t e d t o t h r e e .
As shown i n FIGS. 1 and 4 , t h e a u x i l i a r y c o n t a c t 34, d i s p l a y
p l a t e 3 6 , a n d c o u n t e r 3 8 , whichconstituteamechanismtodetect
t h e s t a t e o f t h e v a c u u m c i r c u i t b r e a k e r 3 2 , a r e l o c a t e d l a t e r a l l y
t o t h e electromagnet 1 4 and above t h e c a p a c i t o r s 16 and f i x e d
15 on a p l a t e 171.
As shown i n FIG. 4 , t h e endof t h e o p e r a t i n g rod 170 o p p o s i t e
t o i t s e n d c o n n e c t e d t o t h e l e v e r 1 8 6 i s c o n n e c t e d t o t h e d i s p l a y
p l a t e 36 through a p i n 136. Since t h e o p e r a t i n g rod 170 moves
t o g e t h e r with t h e s h a f t 98 through t h e l e v e r 186, t h e s t a t e
20 of t h e vacuum c i r c u i t b r e a k e r 32 ( c l o s i n g o r i n t e r r u p t i n g ) can
be i d e n t i f i e d through t h e p o s i t i o n of t h e o p e r a t i n g rod 170.
The d i s p l a y p l a t e 36 is connected t o t h e o p e r a t i n g rod 170 through
a pin 1 4 4 and t h e p o s i t i o n of t h e d i s p l a y p l a t e 36 changes
depending on t h e s t a t e of t h e vacuum c i r c u i t breaker 32, so
25 i t s p o s i t i o n i n d i c a t e s t h e p r e s e n t s t a t e of t h e vacuum c i r c u i t
breaker 32.
The display plate 36is connected tothe counter 38. The
number of motions of the moving electrode 124A of the vacuum
circuit breaker 32 is counted based on the number of motions
5 of the display plate 36, taking the following relation into
consideration: number of motions ofthe moving electrode 124A
of the vacuum circuit breaker 32 = number of motions of the
operating rod 170 = number of motions of the display plate 36.
A lever 138, a pin 142 and the pin 136 are provided between
10 the operating rod 170 and the auxiliary contact 34.
Next, an intermediate fixing plate197 as amajor feature
ofthis embodiment andits vicinitywillbe describedreferring
to FIGS. 4, 5, and 6A to 6C.
As shown in FIGS. 5 and 6A, the intermediate fixing plate
15 197 is provided for each of embedded poles 228, 229 and 230
respectively. Further, as shown in FIGS. 6A to 6C, each of
the intermediate fixing plate 197 has bolt fixing holes 301,
actuating shaft passing holes 302, and bolt fixing holes 303,
and the case 10 is provided with bolt fixing holes 301, actuating
20 shaft passing holes 302, and bolt passing holes 300. The
intermediate fixing plates 197 are on the upper contact 130
and lower contact 132 side of the case 10. The embedded pole
228 (229, 230) is fixed to the case 10 through the intermediate
fixing plate 197 by passing fixing bolts 260 (stated later)
25 through the bolt fixing holes 301.
Specifically, as shown in FIG. 5, three phase embedded
poles 228, 229, and 230 are integrally fixed to each of the
intermediate fixingplate197 respectivelyandboltfixingparts
made of insulating material, 216, 217, 218, 219, 220, and 221,
5 are provided so as to cover the bottomperipheries of the embedded
poles 228, 229, and 230. The bolt fixing parts 216, 217, 218,
219, 220, and 221 are integrated with the embedded poles 228,
229, and 230 respectively and have holes similar to the bolt
fixing holes 301. Further, each hole of the bolt fixing parts
10 is provided with an internal thread to engage with an external
thread of the fixing bolt. The embedded poles 228, 229, and
230 are fixed with the case 10 by passing the fixing bolts 260
through the bolt fixing holes 301 of the case 10 and the
intermediate fixing plate 197 and through the holes ofthe bolt
15 fixing parts 216, 217, 218, 219, 220, and 221. A total of six
fixing bolts 260 are provided.
The bolt passing holes 300 are located on the operating
mechanism side of the embedded poles 228, 229, and 230 and are
larger than an outer diameter of the fixing bolts 261 so that
20 when attachingthe embeddedpoles 228, 229, and 230, the fixing
bolts 261 are merely passed through the bolt passing holes 300
of the case 10 and these holes are not involved in fixing the
embeddedpoles. On the operating mechanism side of the embedded
poles 228, 229, and 230, the embedded poles 228, 229, and 230
25 are fixed to the intermediate fixing plate 197 by passing the
fixing bolts 261 through the bolt fixing holes 303 of the
intermediate fixing plate 197 and through the holes ofthebolt
fixing parts 254. The actuating shaft passing holes 302 of
the embedded poles 228, 229, and 230 are holes through which
5 the actuating shafts, connected to the insulating rod 114, for
transmitting driving power fromthe electromagnetic actuator
11 are passed.
F I G . 7A shows a fixing bolt part in a comparative example
and F I G . 7B shows a bolt fixing part 254 as a fixing bolt part
10 according to this embodiment.
As shown in F I G . 7A, in the fixing bolt part in the
comparative example, the fixing bolt 260 is not penetrated
through the bolt fixing part 216, so when stress is generated,
a rupture 272 may occur in the bolt fixing part 216 due to
15 difference in modulus of elasticity. On the other hand,
according to this embodiment, as shown in F I G . 7B, the fixing
bolt 260 is penetrated through the bolt fixing part 216; thus,
when stress is generated, no rupture 272 due to difference in
modulus of elasticity occurs, so the bolt fixing part 216 is
20 less susceptible to stress.
Next, how to remove the embedded pole 230 will be described
referring to F I G S . 4 and 5.
First, the fixingbolt260 fixingthe intermediate fixing
plate 197 and the case 10 with the bolt fixing part 221 and
25 another fixing bolt 260(on the depth side as viewed in FIG.
4) fixing the intermediate fixing plate 197 and the case 10
with the bolt fixing part 220 are removed. On the operating
mechanism side, the fixing bolts 261 remain in the bolt fixing
parts 254. Then, the embedded pole 230 is raised at a right
5 angle together with the intermediate fixing plate 197 from the
case 10. Consequently, the embedded pole 230 can be removed
withouttheneedforremovingtheoperatingmechanismsidefixing
bolt 261 and the depth side another fixing bolt 261 (on the
depth side as viewed in FIG. 4). The embedded poles 228 and
10 229, arranged in a row in the depth direction, can be removed
in the same manner as above.
Therefore, according tothis embodiment, eventhoughthe
embedded poles 228, 229, and 230 and the case 10 are fixed with
bolts through the intermediate fixing plate 197, the embedded
15 poles 228, 229, and 230 can be easily removed and higher bolt
fixing reliability is achieved in fixing the embedded poles
228, 229, and 230 and case 10 through the intermediate fixing
plate 197.
20 [Second Embodiment]
Fig. 9 shows electromagnetically actuated switchgear
according to the second embodiment of the present invention.
As shown in FIG. 9, in this embodiment, the contactor
s i d e e n d 4 0 0 o f t h e i n t e r m e d i a t e f i x i n g p l a t e 1 9 7 oftheembedded
25 pole 228 is folded down at a right angle to the contact surface
of the case 10 (alternatively it may be folded up). The rest
of the structure is the same as in the first embodiment.
The second embodiment not only brings about the same
advantageouseffectsasthefirstembodimentbutalsoincreases
5 the rigidity of the contact surface between the embedded pole
228 and intermediate fixing plate 197 because the contactor
side end 400 of the intermediate fixing plate 197 of the embedded
pole 228 is folded down.
10 [Third Embodiment]
FIG. 10 shows electromagnetically actuated switchgear
according to the third embodiment of the present invention.
Whereas in the second embodiment shown in FIG. 9 only
the contactor side end 400 of the intermediate fixing plate
15 197 is folded down at a right angle to the contact surface of
the case 10, in the third embodiment, for example, not only
the contactor side end 400 of the intermediate fixing plate
197 is folded down but also its operating mechanism side end
401is foldedup (ordown) atarightangletothecontactsurface
20 of the case 10 as shown in FIG. 10. The rest of the structure
is the same as in the first embodiment.
The third embodiment not only brings about the same
advantageous effects as the secondembodiment but also further
increases the rigidity of the contact surface between the
25 embedded pole 228 and intermediate fixing plate 197 by having
the operating mechanism side end 401ofthe intermediate fixing
plate 197 of the embedded pole 228 folded up at a right angle
to the contact surface of the case 10.
The second embodiment and third embodiment are modified
5 versionsofthefirstembodimentthoughtheyhaveanotherfeature
in addition to the features of the first embodiment. However,
it is obvious that the rigidity of the contact surface between
theembeddedpoleandintermediatefixingplatecanbeincreased
evenby adding the features ofthe secondand thirdembodiments
10 to the conventional structure in which the embedded pole and
case are fixedwithboltsthroughanintermediate fixingplate.
The present invention is not limited to the above
embodiments and includes other various forms of embodiments.
The above embodiments have been explained in detail for easy
15 understanding of the present invention, but an embodiment of
the invention need not include all the elements of the above
embodiments. Some elements of an embodiment may be replaced
by elements of another embodiment or elements of an embodiment
may be added to another embodiment. Also, in an embodiment,
20 addition, deletion or replacement of elements is possible.
[Reference Signs List]
10. . . Case
11 ... Electromagnetic actuator
14 ... Electromagnet
16 . . . Capacitor
18 ... Control board
20 ... Spacer
5 22 ... Secondary plug
28 ... Signal cable
32 ... Vacuum circuit breaker
34..,Auxiliary contact
36. . . Display plate
10 38. . .Counter
48.. .Coil
48a ... Coil bobbin
50 ... Light emitting diode
52 ... ON pushbutton switch
15 54 ... OFF pushbutton switch
56, 171.. .Plate
58 ... Moving core
60. . . Fixed core
62, 88, 98 ... Shaft
20 64, 66 ... Moving flat plate
68 . . . Permanent magnet
70, 72 ... Cover
74, 76, 90, 174.. .Support plate
78. . . Fixing rod
25 80 . . . Lower plate
82, 84 ... Through h o l e
94, 1 0 2 , 1 3 6 , 1 4 4 . . . P i n
92 ... I n t e r r u p t i n g s p r i n g
96, 1 0 0 , 1 8 6 , 1 9 3 . . . L e v e r
5 114 . . . I n s u l a t i n g r o d
121 . . . F l e x i b l e c o n d u c t o r
122 ... Moving f e e d e r c o n d u c t o r
124 ... Moving c o n d u c t o r
124A . . . Moving e l e c t r o d e
10 125 ... F i x e d c o n d u c t o r
125A ... F i x e d e l e c t r o d e
126 . . . I n s u l a t i n g t u b e
129 ... F i x e d f e e d e r c o n d u c t o r
130 ... Upper c o n t a c t
15 132 . . . Lower c o n t a c t
170 . . . O p e r a t i n g r o d
172. . . R i b
173 ... F i x t u r e ( B o l t and Nut)
190 ... Shock a b s o r b e r
20 191 . . . S t o p p e r
192 . . . S p h e r i c a l a d a p t e r
194. . .Nut
195 . . . Thin p l a t e
197 . . . I n t e r m e d i a t e f i x i n g p l a t e
25 216, 217, 218, 219, 2 2 0 , 2 2 1 , 2 5 4 . . . B o l t f i x i n g p a r t
228, 229, 230 ... Embedded pole
250 ... Operating mechanism
260. . . Fixing bolt
261 . . . Operating mechanism side fixing bolt
5 272. . .Rupture
300 ... Bolt passing hole
301 . . . Bolt fixing hole
302 ... Actuating shaft passing hole
303 ... Bolt fixing hole
10 400 ... Contactor side end
401 ... Operating mechanism side end
WE CLAIM:
[Claim 11
Electromagnetically actuated switchgear comprising:
anoperatingmechanismincludinganelectromagnetcovered
5 by a case and located in the center of the case, the electromagnet
having a moving core and a fixed core facing each other and
a coil to make the moving core and the fixed core separate from
each other or come into contact with each other a.ccording to
an electromagnetic force; and
10 a vacuum circuit breaker including an embedded pole
integrally cast with insulator, in which a moving electrode
and a fixed electrode facing each other are made to separate
fromeach other or come into contact with each other by driving
power derived from electromagnetic force generated by the
15 electromagnet of the operating mechanism through a link
mechanism including a driving rod, a lever, and an insulating
rod, with the embedded pole fixed to the case with fixing bolts
through an intermediate fixing plate,
wherein bolt fixing holes are made in the intermediate
20 fixing plate, bolt fixing parts are provided in a way to cover
a bottom periphery of the embedded pole, holes similar to the
bolt fixing holes are made in the bolt fixing parts, and the
fixing bolts are passed through the bolt fixing holes of the
intermediate fixing plate and penetratedthroughthe holes of
25 the bolt fixing parts.
[Claim 21
Electromagnetically actuated switchgear comprising:
anoperatingmechanismincludinganelectromagnetcovered
by a case and located in the center of the case, the electromagnet
5 having a moving core and a fixed core facing each other and
a coil to make the moving core and the fixed core separate from
each other or come into contact with each other according to
an electromagnetic force; and
a vacuum circuit breaker including an embedded pole
10 integrally cast with insulator, in which a moving electrode
and a fixed electrode facing each other are made to separate
fromeach other or come into contact with each other by driving
power derived from electromagnetic force generated by the
electromagnet of the operating mechanism through a link
15 mechanism including a driving rod, a lever, and an insulating
rod, with the embeddedpole fixed tothe case with fixing bolts
through an intermediate fixing plate,
whereinacontactorsideendand/oranoperatingmechanism
sideendofthe intermediate fixingplate are foldedupordown.
20 [Claim 31
The electromagnetically actuated switchgear according
to Claim 2,
wherein bolt fixing holes are made in the intermediate
fixing plate and bolt fixing parts are provided in a way to
25 cover a bottom periphery of the embedded pole, holes similar
to the bolt fixing holes are made in the bolt fixing parts,
and the fixing bolts are passed through the bolt fixing holes
of the intermediate fixing plate and penetrated through the
holes of the bolt fixing parts.
5 [Claim 41
The electromagnetically actuated switchgear according
to Claim 2 or 3,
whereinthecontactorsideendandtheoperatingmechanism
side endofthe intermediate fixingplate are foldedin opposite
10 directions.
[Claim 51
The electromagnetically actuated switchgear according
to Claim 1 or 2,
wherein the intermediate fixing plate is used to fix the
15 three phase embedded poles.