Title of Invention	SWITCH DISCONNECTOR
Abstract	The invention relates to a load-break switch with a main contact point and an arc rupture contact point, the main contact point being opened upstream of the arc rupture contact point for disconnection and being closed downstream of the arc rupture contact point for connection. The load-break switch comprises a stationary and a mobile contact element arrangement, the stationary contact element arrangement having a pot-shaped contact element with contact fingers and the mobile main contact element having a contact cylinder that is connected to a contact support. The arc rupture point comprises a contact pin as the stationary contact element and an annular contact element as the mobile contact element. The contact pin (18) comprises a section (34) from a tear-proof material having an outer diameter that is larger than the outer diameter of the remaining pin section. The contact pin (18) is provided with at least one longitudinal slot that divides the pin into at least two pin fingers.

Title of Invention

SWITCH DISCONNECTOR

Abstract

The invention relates to a load-break switch with a main contact point and an arc rupture contact point, the main contact point being opened upstream of the arc rupture contact point for disconnection and being closed downstream of the arc rupture contact point for connection. The load-break switch comprises a stationary and a mobile contact element arrangement, the stationary contact element arrangement having a pot-shaped contact element with contact fingers and the mobile main contact element having a contact cylinder that is connected to a contact support. The arc rupture point comprises a contact pin as the stationary contact element and an annular contact element as the mobile contact element. The contact pin (18) comprises a section (34) from a tear-proof material having an outer diameter that is larger than the outer diameter of the remaining pin section. The contact pin (18) is provided with at least one longitudinal slot that divides the pin into at least two pin fingers.

Full Text	WO 2006/114214 PCT/EP2006/003500 Switch disconnector Description The invention relates to a medium-voltage switch disconnector as claimed in the precharacterizing clause of claim 1. German Patent Application DE 10 2005 009 207.1 describes a switch disconnector of the type mentioned initially, which is installed in a medium-voltage switchgear assembly and has the task there of disconnection and connection at the rated load. For this purpose, the switch disconnector has a stationary contact-piece arrangement and a moving contact-piece arrangement, which is attached to a contact spindle or a contact rod as a contact mount, which is coupled to a pivoting lever arrangement that is operated by a driveshaft. The contact point comprises a main contact point and an arc interruption point, with the main contact point having a pot contact piece with contact fingers. The object of the invention is to optimize a switch disconnector of the type mentioned initially. According to the invention, this object is achieved by the features of claim 1. Further advantageous refinements and improvements of the invention can be found in the other dependent claims. The invention as well as further advantageous refinements and improvements of the invention will be explained and described in more detail with reference WO 2006/114214 PCT/EP2006/003500 - 2 - to the drawing, which illustrates one exemplary embodiment of the invention, and in which: Figure 1 shows a contact point of a switch disconnector in the connected position, Figure 2 shows the contact point from Figure 1, shortly before the disconnected position, Figure 3 shows a perspective view of the main contact points during further disconnection, and Figure 4 shows a perspective view of a contact pin. Reference is made to Figure 1. The contact point of a switch disconnector as shown there is located in an enclosure 10 in the form of a pot and composed of insulating plastic, as has been disclosed in DE 10 2005 009 207.1. At its free end, the container 10 is closed by a base section 11 in which a cylindrical contact section or sleeve 12 is fixed, which has a hole 13 via which a connecting line can be connected as indicated by the direction of the arrow P. A stationary main contact piece 14 is connected to the inner end of the contact sleeve 12 and is in the form of a tulip with a baseplate 15 and contact fingers 16 connected to it, which have a drawn-in area 17, pointing inwards, at their free ends. A contact pin 18, which is illustrated in more detail in Figure 4, is fixed in the hole 13. A contact mount 19 in the form of a contact rod is guided (in a manner which is not illustrated in any more detail) within the container 10, and a sealing plate is attached to its inner end, and is fitted on WO 2006/114214 PCT/EP2006/003500 - 3 - its outer circumference with a seal 21 which rests against the inner surface of the container 10, where it is used to form a seal. A cylinder 22 is attached to the plate 20 and is fitted on its inner surface with a contact piece 23 in the form of a nozzle, with the nozzle shape forming the inner contour 24. At its opposite end to the contact piece 23, the cylinder 22 has a strip 25 which projects radially inwards, surrounds the contact rod 19 and is firmly connected to it there. The interior 26 of the cylinder 22 is provided in the area of the strip 25 with aperture openings 27 which, in the axial direction, connect the interior 26 to the area 28 underneath the plate 20. A blowing cylinder 29 composed of insulating plastic is attached to the end of the cylinder 22 on the side opposite the plate 20. Reference is now made to Figure 4. Figure 4 shows the contact pin 18. This contact pin 18 has an approximately cylindrical shape and has a pin section 30 which is inserted with a force fit into the hole 13. The section 30 is connected to a hexagonal plate section 31 which rests against the inner surface 32 of the base 15 of the main contact piece 14 and firmly connects the main contact piece 14 to the contact cylinder 12. The contact pin 18 has a contact finger section 33 which has a widened section 34 radially at its free end, which gives the contact pin 32 a microphone-like structure. The contact pin 32 has an axially running longitudinal slot 33, thus forming two contact pin fingers 35 and 36. The external diameter of the section 34 is greater than the internal diameter of the contact piece 23, so that, when a disconnection operation occurs, that is to say when the contact piece mount is drawn in the direction of the arrow P1, the inner surface of the contact piece 23 WO 2006/114214 PCT/EP2006/003500 - 4 - slides onto the outer surface of the section 34, thus forcing the two contact pin fingers 35 and 36 towards one another. The contact piece 23 is composed of material which is resistant to arc interruption, as is the section 34. When a switching operation now occurs and the contact mount 19 is drawn downwards with the moving contact piece 23 (see figure 1) in the direction of the arrow P1, then the contact cylinder 22 slides out of the contact fingers 16, as can be seen in Figure 2; however, in this case, the contact pin 18 is still electrically conductively connected to the contact piece 23 so that, once the contact finger 16 has been disconnected from the contact cylinder 22, the current flows from the contact cylinder 22 via the contact piece 23 towards the contact pin 18. The blowing cylinder 29 has an opening 40 whose internal diameter corresponds approximately to the external diameter of the section 34. In the position shown in Figure 2, the opening of the blowing cylinder 29 slides onto the section 34. As soon as the contact piece 23 has been disconnected from the section 34 of the contact pin 32, an arc 43 is formed there (see Figure 3) and is blown from the blowing cylinder 29, which is composed of insulating material, with the gas from it in the area 41. The insulating plastic of the blowing cylinder 29 is composed of material which emits gas, thus resulting in optimum blowing of the arc between the section 34 and the contact piece 23. Figure 3 shows the contact arrangement shortly after disconnection of the contact piece 23 from the section 34, with the arc 43 being struck here, which is WO 2006/114214 PCT/EP2006/003500 - 5 - quenched by quenching gas flowing out of the area 41 in the direction of the arrow P2. A cup 50 is electrically conductively firmly connected to the contact cylinder 12, surrounds the container 10 and, in the area of the contact point, has a field control ring 51 which is located between the contact piece and the contact cylinder 22, as described in more detail in Patent Application DE 10 2005 009 207.1. WO 2006/114214 PCT/EP2006/003500 - 6 - Patent Claims 1. A switch disconnector with a main contact point and an arc interruption contact point, of which the main contact point opens before the arc interruption contact point during a disconnection operation and is closed after the arc interruption contact point during connection, with a stationary and a moving contact- piece arrangement, with the stationary contact-piece arrangement having a pot contact piece with contact fingers and with the moving main contact point having a contact cylinder which is connected to a contact mount, and with the arc interruption point having a contact pin as the stationary contact piece and an annular contact piece as the moving contact piece, characterized in that the contact pin (18) has a section (34) composed of interruption-resistant material, whose external diameter is greater than the external diameter of the rest of the pin area, and in that the contact pin (18) has at least one slot which runs in the longitudinal direction and splits the pin into at least two pin fingers. 2. The switch disconnector as claimed in claim 1, characterized in that the moving contact piece (23), which is associated with the arc interruption contact point, is at least partially composed of a material which is resistant to arc interruption. 3. The switch disconnector as claimed in claim 2, characterized in that the moving contact piece (23) has a nozzle shape on its inner contour, whose narrowest internal diameter is less than the external diameter of the section (34) on the contact pin (18), such that the two contact pin fingers are pressed against one another during a switching operation. WO 2006/114214 PCT/EP2006/003500 - 7 - 4. The switch disconnector as claimed in claim 2 or 3, characterized in that a blowing cylinder (29) composed of electrically insulating material is formed on the contact cylinder (22) and surrounds an inner opening (40) whose internal diameter corresponds to the external diameter of the section (34) of the contact pin, such that, once the inner opening (40) has run onto the section (34), the gas which is located within the blowing cylinder blows the arc which has been struck between the moving contact piece (23) and the contact pin (18). 5. The switch disconnector as claimed in one of the preceding claims, characterized in that the blowing cylinder (29) is composed of a material which emits gas when an arc occurs. The invention relates to a load-break switch with a main contact point and an arc rupture contact point, the main contact point being opened upstream of the arc rupture contact point for disconnection and being closed downstream of the arc rupture contact point for connection. The load-break switch comprises a stationary and a mobile contact element arrangement, the stationary contact element arrangement having a pot-shaped contact element with contact fingers and the mobile main contact element having a contact cylinder that is connected to a contact support. The arc rupture point comprises a contact pin as the stationary contact element and an annular contact element as the mobile contact element. The contact pin (18) comprises a section (34) from a tear-proof material having an outer diameter that is larger than the outer diameter of the remaining pin section. The contact pin (18) is provided with at least one longitudinal slot that divides the pin into at least two pin fingers.

Full Text

WO 2006/114214

PCT/EP2006/003500

Switch disconnector
Description
The invention relates to a medium-voltage switch
disconnector as claimed in the precharacterizing clause
of claim 1.
German Patent Application DE 10 2005 009 207.1
describes a switch disconnector of the type mentioned
initially, which is installed in a medium-voltage
switchgear assembly and has the task there of
disconnection and connection at the rated load. For
this purpose, the switch disconnector has a stationary
contact-piece arrangement and a moving contact-piece
arrangement, which is attached to a contact spindle or
a contact rod as a contact mount, which is coupled to a
pivoting lever arrangement that is operated by a
driveshaft.
The contact point comprises a main contact point and an
arc interruption point, with the main contact point
having a pot contact piece with contact fingers.
The object of the invention is to optimize a switch
disconnector of the type mentioned initially.
According to the invention, this object is achieved by
the features of claim 1.
Further advantageous refinements and improvements of
the invention can be found in the other dependent
claims.
The invention as well as further advantageous
refinements and improvements of the invention will be
explained and described in more detail with reference

WO 2006/114214 PCT/EP2006/003500
- 2 -
to the drawing, which illustrates one exemplary
embodiment of the invention, and in which:
Figure 1 shows a contact point of a switch
disconnector in the connected position,
Figure 2 shows the contact point from Figure 1,
shortly before the disconnected position,
Figure 3 shows a perspective view of the main
contact points during further
disconnection, and
Figure 4 shows a perspective view of a contact pin.
Reference is made to Figure 1.
The contact point of a switch disconnector as shown
there is located in an enclosure 10 in the form of a
pot and composed of insulating plastic, as has been
disclosed in DE 10 2005 009 207.1. At its free end, the
container 10 is closed by a base section 11 in which a
cylindrical contact section or sleeve 12 is fixed,
which has a hole 13 via which a connecting line can be
connected as indicated by the direction of the arrow P.
A stationary main contact piece 14 is connected to the
inner end of the contact sleeve 12 and is in the form
of a tulip with a baseplate 15 and contact fingers 16
connected to it, which have a drawn-in area 17,
pointing inwards, at their free ends. A contact pin 18,
which is illustrated in more detail in Figure 4, is
fixed in the hole 13.
A contact mount 19 in the form of a contact rod is
guided (in a manner which is not illustrated in any
more detail) within the container 10, and a sealing
plate is attached to its inner end, and is fitted on

WO 2006/114214 PCT/EP2006/003500
- 3 -
its outer circumference with a seal 21 which rests
against the inner surface of the container 10, where it
is used to form a seal. A cylinder 22 is attached to
the plate 20 and is fitted on its inner surface with a
contact piece 23 in the form of a nozzle, with the
nozzle shape forming the inner contour 24. At its
opposite end to the contact piece 23, the cylinder 22
has a strip 25 which projects radially inwards,
surrounds the contact rod 19 and is firmly connected to
it there. The interior 26 of the cylinder 22 is
provided in the area of the strip 25 with aperture
openings 27 which, in the axial direction, connect the
interior 26 to the area 28 underneath the plate 20. A
blowing cylinder 29 composed of insulating plastic is
attached to the end of the cylinder 22 on the side
opposite the plate 20.
Reference is now made to Figure 4.
Figure 4 shows the contact pin 18. This contact pin 18
has an approximately cylindrical shape and has a pin
section 30 which is inserted with a force fit into the
hole 13. The section 30 is connected to a hexagonal
plate section 31 which rests against the inner surface
32 of the base 15 of the main contact piece 14 and
firmly connects the main contact piece 14 to the
contact cylinder 12. The contact pin 18 has a contact
finger section 33 which has a widened section 34
radially at its free end, which gives the contact pin
32 a microphone-like structure. The contact pin 32 has
an axially running longitudinal slot 33, thus forming
two contact pin fingers 35 and 36. The external
diameter of the section 34 is greater than the internal
diameter of the contact piece 23, so that, when a
disconnection operation occurs, that is to say when the
contact piece mount is drawn in the direction of the
arrow P1, the inner surface of the contact piece 23

WO 2006/114214 PCT/EP2006/003500
- 4 -
slides onto the outer surface of the section 34, thus
forcing the two contact pin fingers 35 and 36 towards
one another.
The contact piece 23 is composed of material which is
resistant to arc interruption, as is the section 34.
When a switching operation now occurs and the contact
mount 19 is drawn downwards with the moving contact
piece 23 (see figure 1) in the direction of the arrow
P1, then the contact cylinder 22 slides out of the
contact fingers 16, as can be seen in Figure 2;
however, in this case, the contact pin 18 is still
electrically conductively connected to the contact
piece 23 so that, once the contact finger 16 has been
disconnected from the contact cylinder 22, the current
flows from the contact cylinder 22 via the contact
piece 23 towards the contact pin 18.
The blowing cylinder 29 has an opening 40 whose
internal diameter corresponds approximately to the
external diameter of the section 34. In the position
shown in Figure 2, the opening of the blowing cylinder
29 slides onto the section 34. As soon as the contact
piece 23 has been disconnected from the section 34 of
the contact pin 32, an arc 43 is formed there (see
Figure 3) and is blown from the blowing cylinder 29,
which is composed of insulating material, with the gas
from it in the area 41. The insulating plastic of the
blowing cylinder 29 is composed of material which emits
gas, thus resulting in optimum blowing of the arc
between the section 34 and the contact piece 23.
Figure 3 shows the contact arrangement shortly after
disconnection of the contact piece 23 from the section
34, with the arc 43 being struck here, which is

WO 2006/114214 PCT/EP2006/003500
- 5 -
quenched by quenching gas flowing out of the area 41 in
the direction of the arrow P2.
A cup 50 is electrically conductively firmly connected
to the contact cylinder 12, surrounds the container 10
and, in the area of the contact point, has a field
control ring 51 which is located between the contact
piece and the contact cylinder 22, as described in more
detail in Patent Application DE 10 2005 009 207.1.

WO 2006/114214 PCT/EP2006/003500
- 6 -
Patent Claims
1. A switch disconnector with a main contact point
and an arc interruption contact point, of which the
main contact point opens before the arc interruption
contact point during a disconnection operation and is
closed after the arc interruption contact point during
connection, with a stationary and a moving contact-
piece arrangement, with the stationary contact-piece
arrangement having a pot contact piece with contact
fingers and with the moving main contact point having a
contact cylinder which is connected to a contact mount,
and with the arc interruption point having a contact
pin as the stationary contact piece and an annular
contact piece as the moving contact piece,
characterized in that the contact pin (18) has a
section (34) composed of interruption-resistant
material, whose external diameter is greater than the
external diameter of the rest of the pin area, and in
that the contact pin (18) has at least one slot which
runs in the longitudinal direction and splits the pin
into at least two pin fingers.
2. The switch disconnector as claimed in claim 1,
characterized in that the moving contact piece (23),
which is associated with the arc interruption contact
point, is at least partially composed of a material
which is resistant to arc interruption.
3. The switch disconnector as claimed in claim 2,
characterized in that the moving contact piece (23) has
a nozzle shape on its inner contour, whose narrowest
internal diameter is less than the external diameter of
the section (34) on the contact pin (18), such that the
two contact pin fingers are pressed against one another
during a switching operation.

WO 2006/114214 PCT/EP2006/003500
- 7 -
4. The switch disconnector as claimed in claim 2 or
3, characterized in that a blowing cylinder (29)
composed of electrically insulating material is formed
on the contact cylinder (22) and surrounds an inner
opening (40) whose internal diameter corresponds to the
external diameter of the section (34) of the contact
pin, such that, once the inner opening (40) has run
onto the section (34), the gas which is located within
the blowing cylinder blows the arc which has been
struck between the moving contact piece (23) and the
contact pin (18).
5. The switch disconnector as claimed in one of the
preceding claims, characterized in that the blowing
cylinder (29) is composed of a material which emits gas
when an arc occurs.

The invention relates to a load-break switch with a main contact point and an arc
rupture contact point, the main contact point being opened upstream of the arc rupture
contact point for disconnection and being closed downstream of the arc rupture contact
point for connection. The load-break switch comprises a stationary and a mobile contact
element arrangement, the stationary contact element arrangement having a pot-shaped
contact element with contact fingers and the mobile main contact element having a
contact cylinder that is connected to a contact support. The arc rupture point comprises
a contact pin as the stationary contact element and an annular contact element as the
mobile contact element. The contact pin (18) comprises a section (34) from a tear-proof material having an outer diameter that is larger than the outer diameter of the remaining pin section. The contact pin (18) is provided with at least one longitudinal slot that divides the pin into at least two pin fingers.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=24My5VrfjnPGCdF4yQBJFw==&loc=wDBSZCsAt7zoiVrqcFJsRw==

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Patent Number

271979

Indian Patent Application Number

3859/KOLNP/2007

PG Journal Number

12/2016

Publication Date

18-Mar-2016

Grant Date

11-Mar-2016

Date of Filing

10-Oct-2007

Name of Patentee

ABB TECHNOLOGY AG

Applicant Address

AFFOLTERNSTRASSE 44 CH-8050 ZURICH

Inventors:

#	Inventor's Name	Inventor's Address
1	KUHLEFELT, JAN-HENRIK	FOSSUMGATA 30, N-3716 SKIEN
2	GRANHAUG OLE	OLEA CROGERS VEG 12B, N-3724 SKIEN
3	SKRYTEN, PAL	SONDRE FJELLGATE 6, N-3714 SKIEN

PCT International Classification Number

H01H 1/38,H01H 33/12

PCT International Application Number

PCT/EP2006/003500

PCT International Filing date

2006-04-18

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10 2005 019 424.9	2005-04-25	Germany