WO2011134528A1 - A selector switch arrangement for a high voltage device - Google Patents
A selector switch arrangement for a high voltage device Download PDFInfo
- Publication number
- WO2011134528A1 WO2011134528A1 PCT/EP2010/055907 EP2010055907W WO2011134528A1 WO 2011134528 A1 WO2011134528 A1 WO 2011134528A1 EP 2010055907 W EP2010055907 W EP 2010055907W WO 2011134528 A1 WO2011134528 A1 WO 2011134528A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current collector
- selector switch
- cylindrical
- switch arrangement
- copper
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
- H01H1/025—Composite material having copper as the basic material
Definitions
- the present invention refers to a selector switch arrangement for a high voltage ( > 1 kV ) device, such as a tap-changer, comprising a cylindrical current collector made of electrically conductive material and having a first and a second end, a movable contact arranged movable along the perimeter of said first end of said contact device and in contact with said first end and at least two contacts fixedly connected to said contact device
- Tap changers are used to change the tapping connection of a transformer winding while the transformer is energized.
- the tap changer can be designed as a single unit for single and three-phase applications with one common neutral point. Depending on the three-phase rating, this might require three separate units, each having its own insulated phases. Tap changers can be located either inside the transformer main tank or outside in its own
- Tap changers can be on-load or off-load, and on-load tap changers generally includes a diverter switch operating to effect transfer current from one voltage tap to the next.
- the diverter switch does the entire on load making and breaking of currents, whereas the selector switch pre-selects the tap to which the diverter switch will transfer the load current.
- the selector switch also contains at least two fixed contacts arranged in the housing of the tap-changer, a current collector, vacuum interrupters, movable contacts and a mechanism arranged for controlling (open/close) the vacuum interrupters.
- the current collector is arranged to transfer current between the movable contact of the selector switch and the fixed contacts arranged in the housing of the tap- changer.
- the object of the invention is to provide a selector switch arrangement, which is less expensive to manufacture compared to previous solutions, and has low conduction point resistance and high mechanical strength.
- the selector switch arrangement initially defined, which is characterised in that the cylindrical current collector comprises a first and a second cylindrical part arranged joined together wherein the first part comprises the first end substantially made of copper or an copper alloy, and the second part comprises the second end substantially made of aluminium or an aluminium alloy.
- the height of the first part of the current collector is less, or even significantly smaller, than the height of the second part of said current collector.
- content of copper in the current collector will be less than the content of aluminium.
- the composition of the current collector consists of 10-15 % by weight of copper and the rest of aluminium.
- the selector switch arrangement is a part of a tap-changer.
- Figure 1 a shows a perspective view, as seen from above, of a selector switch arrangement according to an embodiment of the invention.
- Figure 1 b shows a perspective view, as seen from below, of the selector switch arrangement seen in figure 1 a.
- Figure 2 shows a perspective view of the cylindrical current collector with a fixed contact attached
- Figure 1 a and 1 b shows a perspective view of a selector switch arrangement 1 for a high voltage device comprising a cylindrical current collector 2 made of electrically conductive material and having a first 3 and a second end 4, a movable contact 5 arranged movable along the perimeter of the first end 3 of the cylindrical current collector 2 and in contact with the first end 3 and at least two contacts (not shown) fixedly connected to the cylindrical current collector 2.
- the cylindrical current collector 2 comprises a first 6 and a second 7 cylindrical part arranged joined together wherein the first part 6 comprises the first end 3 and is substantially made of copper, a material with high conductive and mechanical properties, or a copper alloy.
- the second part 7 comprises the second end 4 and is substantially made of aluminium, a material with low conduction point resistance, or an aluminium alloy.
- the first part 6 of the cylindrical current collector 2 is made of pure copper.
- a copper alloy or to cover the first part 6 of the cylindrical current collector 2 with a precious metal, e.g. silver (Ag).
- the second part 7 of the cylindrical current collector 2 is made of pure aluminium.
- an aluminium alloy By such arrangement low conduction point resistance between the movable contact 5 and the first end 3 of the cylindrical current collector 2 is achieved since copper does not suffer from build-up of oxides. Thereby, the selector switch arrangement 1 will not suffer from build-up of aluminum oxides and thus it will have at least equal electrical and mechanical properties compared to previously known selector switch arrangements.
- the selector switch arrangement 1 comprises a mechanism 10 which is arranged to open or close vacuum interrupters (not shown).
- the movable contact 5, the mechanism 10 and the vacuum interrupters are arranged attached to a selector switch shaft 1 1 .
- the cylindrical current collector 2 is secured by fastening means (not shown), on the inside perimeter of an elongated housing (not shown). At least two fixed contacts (not shown) are fastened in place in the housing.
- the first part 6 of the cylindrical current collector 2 is arranged to receive the movable contact 5 which is arranged to transfer current to the cylindrical current collector 2.
- the second part 7 of the cylindrical current collector 2 comprises at least two static contacts 8 arranged to transfer current to fixed contacts (not shown) arranged in place in the elongated housing.
- the first 6 and the second 7 part of the cylindrical current collector 2 are arranged jointly together, for example by means of friction stir welding, or similar methods such as laser welding. Thereby aluminium and copper will integrate and thus stable resistance, despite the build-up of oxidations on the material, will be achieved.
- friction stir welding or similar methods such as laser welding, means that no other material is involved except copper and aluminium.
- Figure 2 shows the cylindrical current collector 2 with a fixed contact 9 attached thereto.
Landscapes
- Push-Button Switches (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
A selector switch arrangement (1) for a high voltage device comprising a cylindrical current collector (2) made of electrically conductive material and having a first (3) and a second end (4), a movable contact (5) arranged movable along the perimeter of the first end (3) of the current collector (2) and in contact with the first end (3) and at least two contacts (8) fixedly connected to the current collector (2). The cylindrical current collector (2) comprises a first cylindrical part (6) and a second cylindrical part (7), arranged joined together wherein the first cylindrical part (6) comprises the first end (3) and is substantially made of copper or a copper alloy. The second cylindrical part (7) of the cylindrical current collector (2) comprises the second end (4) and is substantially made of aluminium or an aluminium alloy.
Description
A selector switch arrangement for a high voltage device
TECHNICAL FIELD
The present invention refers to a selector switch arrangement for a high voltage ( > 1 kV ) device, such as a tap-changer, comprising a cylindrical current collector made of electrically conductive material and having a first and a second end, a movable contact arranged movable along the perimeter of said first end of said contact device and in contact with said first end and at least two contacts fixedly connected to said contact device
BACKGROUND ART
Tap changers are used to change the tapping connection of a transformer winding while the transformer is energized. The tap changer can be designed as a single unit for single and three-phase applications with one common neutral point. Depending on the three-phase rating, this might require three separate units, each having its own insulated phases. Tap changers can be located either inside the transformer main tank or outside in its own
compartment. Switching from one position to another has to be performed through an impedance to avoid a short circuit between two steps of the regulating winding. Tap changers can be on-load or off-load, and on-load tap changers generally includes a diverter switch operating to effect transfer current from one voltage tap to the next. The diverter switch does the entire on load making and breaking of currents, whereas the selector switch pre-selects the tap to which the diverter switch will transfer the load current. The selector switch also contains at least two fixed contacts arranged in the housing of the tap-changer, a current collector, vacuum interrupters, movable contacts and a mechanism arranged for controlling (open/close) the vacuum interrupters. The current collector is arranged to transfer current between the movable contact of the selector switch and the fixed contacts arranged in the housing of the tap- changer.
Today, current collectors are typically made completely from copper (Cu). The reason for this is the need for having the current collectors made from a material with low conduction point resistance and high mechanical streght. However, the use of copper makes it expensive to manufacture the current collectors. Aluminium is also efficient as a conductor but inefficient when used
as, or together with a moving contact. The reason for this is that aluminium has low surface hardness and therefore has a build-up of aluminium oxide on its surface. Too much build-up of aluminium oxide will increase contact resistance, since the electrical conductivity for aluminium oxide is poor, and hence when the tap-changer is in operation the temperature will increase. Therefore use of additional cooling of the tap-changer might be required and this must be avoided.
SUMMARY OF THE INVENTION
The object of the invention is to provide a selector switch arrangement, which is less expensive to manufacture compared to previous solutions, and has low conduction point resistance and high mechanical strength.
This is object is achieved by the selector switch arrangement initially defined, which is characterised in that the cylindrical current collector comprises a first and a second cylindrical part arranged joined together wherein the first part comprises the first end substantially made of copper or an copper alloy, and the second part comprises the second end substantially made of aluminium or an aluminium alloy. By such arrangement, and compared to previously known solutions, the selector switch arrangement will be less expensive to
manufacture since the total amount of copper in the current collector will be significantly reduced. Also, by such arrangement low conduction point resistance between the movable contact, which is substantially made of pure copper, and the first end of the cylindrical current collector is achieved as the copper in the first end of the cylindrical current collector will not suffer from build-up of oxides. Thereby, although the material in the second cylindrical part of the current collector in unstable regarding surface oxidation and thereby easily can increase its resistance, the selector switch arrangement will not suffer from build-up of aluminum oxides and thus it will have at least equal electrical and mechanical properties compared to previously known selector switch arrangements.
According to an embodiment of the invention the height of the first part of the current collector is less, or even significantly smaller, than the height of the second part of said current collector. Thereby, content of copper in the current collector will be less than the content of aluminium. Thus the manufacturing
cost will be reduced compared to previously known solutions. Another advantage is that the current collector will have less weight compared to previously known solutions. According to a further embodiment of the invention the composition of the current collector consists of 10-15 % by weight of copper and the rest of aluminium.
According to a preferred embodiment of the invention the selector switch arrangement is a part of a tap-changer.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 a shows a perspective view, as seen from above, of a selector switch arrangement according to an embodiment of the invention.
Figure 1 b shows a perspective view, as seen from below, of the selector switch arrangement seen in figure 1 a. Figure 2 shows a perspective view of the cylindrical current collector with a fixed contact attached
DETAILED DESCRIPTION
Figure 1 a and 1 b shows a perspective view of a selector switch arrangement 1 for a high voltage device comprising a cylindrical current collector 2 made of electrically conductive material and having a first 3 and a second end 4, a movable contact 5 arranged movable along the perimeter of the first end 3 of the cylindrical current collector 2 and in contact with the first end 3 and at least two contacts (not shown) fixedly connected to the cylindrical current collector 2. The cylindrical current collector 2 comprises a first 6 and a second 7 cylindrical part arranged joined together wherein the first part 6 comprises the first end 3 and is substantially made of copper, a material with high conductive and mechanical properties, or a copper alloy. The second part 7 comprises the second end 4 and is substantially made of aluminium, a material with low conduction point resistance, or an aluminium alloy. Preferably, the first part 6
of the cylindrical current collector 2 is made of pure copper. However, it is also possible to use a copper alloy or to cover the first part 6 of the cylindrical current collector 2 with a precious metal, e.g. silver (Ag). Preferably, the second part 7 of the cylindrical current collector 2 is made of pure aluminium. However, it is also possible to use an aluminium alloy. By such arrangement low conduction point resistance between the movable contact 5 and the first end 3 of the cylindrical current collector 2 is achieved since copper does not suffer from build-up of oxides. Thereby, the selector switch arrangement 1 will not suffer from build-up of aluminum oxides and thus it will have at least equal electrical and mechanical properties compared to previously known selector switch arrangements.
After that current has been transferred from the movable contact 5 to the first part 3 of the cylindrical current collector 2, the copper in the first part 6 of the cylindrical current collector 2 will work as contact conduction point material and the aluminium in the second part 7 of the cylindrical current collector 2 will work as the main conductor. Thus, current will be transferred from the first part 6 to the second part 7. Further the selector switch arrangement 1 comprises a mechanism 10 which is arranged to open or close vacuum interrupters (not shown). The movable contact 5, the mechanism 10 and the vacuum interrupters are arranged attached to a selector switch shaft 1 1 . The cylindrical current collector 2 is secured by fastening means (not shown), on the inside perimeter of an elongated housing (not shown). At least two fixed contacts (not shown) are fastened in place in the housing.
The first part 6 of the cylindrical current collector 2 is arranged to receive the movable contact 5 which is arranged to transfer current to the cylindrical current collector 2. The second part 7 of the cylindrical current collector 2 comprises at least two static contacts 8 arranged to transfer current to fixed contacts (not shown) arranged in place in the elongated housing.
The first 6 and the second 7 part of the cylindrical current collector 2 are arranged jointly together, for example by means of friction stir welding, or similar methods such as laser welding. Thereby aluminium and copper will integrate and thus stable resistance, despite the build-up of oxidations on the
material, will be achieved. One major advantage is that using friction stir welding, or similar methods such as laser welding, means that no other material is involved except copper and aluminium. Figure 2 shows the cylindrical current collector 2 with a fixed contact 9 attached thereto.
Claims
1 . A selector switch arrangement (1 ) for a high voltage device comprising:
- a cylindrical current collector (2) made of electrically conductive material and having a first (3) and a second (4) end,
- a movable contact (5) arranged movable along the perimeter of said first end (3) of said current collector (2) and in contact with said first end (3),
- at least two contacts (8) fixedly connected to said current collector (2), characterised in that said cylindrical current collector (2) comprises a first (6) and a second (7) cylindrical part arranged joined together wherein the first (6) part comprises said first end (3) and is substantially made of copper or an copper alloy, and the second part (7) comprises said second end (4) and is substantially made of aluminium or an aluminium alloy.
2. A selector switch arrangement (1 ) according to claiml , characterised in that said first cylindrical part (6) consists of copper and said second cylindrical part (7) consists of aluminium.
3. A selector switch arrangement (1 ) according to claim 1 -2, characterised in that the height of said first part (6) of said current collector (2) is less than the height of said second part (7) of said current collector (2).
4. A selector switch arrangement (1 ) according to claim 1 -2, characterised in that the height of said first part (6) of said current collector (2) is significantly smaller than the height of said second part (7) of said current collector (2).
5. A selector switch arrangement according to claim 1 -2, characterised in that the composition of said cylindrical current collector (2) consists of 10-15 % by weight of copper and the rest of aluminium.
6. Use of a selector switch arrangement (1 ) for a high voltage device according to any one of the previous claims, wherein said switch arrangement (1 ) is a part of a tap-changer.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2010/055907 WO2011134528A1 (en) | 2010-04-30 | 2010-04-30 | A selector switch arrangement for a high voltage device |
| DE202011000963U DE202011000963U1 (en) | 2010-04-30 | 2011-04-21 | Selector switch assembly for a high voltage device |
| CN2011201378245U CN202110974U (en) | 2010-04-30 | 2011-04-29 | Selector switching device for high voltage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2010/055907 WO2011134528A1 (en) | 2010-04-30 | 2010-04-30 | A selector switch arrangement for a high voltage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011134528A1 true WO2011134528A1 (en) | 2011-11-03 |
Family
ID=43416811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2010/055907 WO2011134528A1 (en) | 2010-04-30 | 2010-04-30 | A selector switch arrangement for a high voltage device |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN202110974U (en) |
| DE (1) | DE202011000963U1 (en) |
| WO (1) | WO2011134528A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013107545A1 (en) * | 2013-07-16 | 2015-01-22 | Maschinenfabrik Reinhausen Gmbh | load selector |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013107550B4 (en) | 2013-07-16 | 2017-05-04 | Maschinenfabrik Reinhausen Gmbh | load selector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2436537A1 (en) * | 1974-02-16 | 1975-08-21 | Transformatoren Union Ag | Soldering contact-tracks onto sliding rings - solder laid into groove underneath ring of step-switch selectors, then heated |
| DE2536771A1 (en) * | 1975-08-19 | 1977-03-03 | Transformatoren Union Ag | Electrical contacts for tap changers or stepping switches - using silver deposits on all moving and stationary contact surfaces |
| DE3833126A1 (en) * | 1988-09-29 | 1990-04-05 | Siemens Ag | LOAD SELECTOR FOR STAGE TRANSFORMERS |
-
2010
- 2010-04-30 WO PCT/EP2010/055907 patent/WO2011134528A1/en active Application Filing
-
2011
- 2011-04-21 DE DE202011000963U patent/DE202011000963U1/en not_active Expired - Lifetime
- 2011-04-29 CN CN2011201378245U patent/CN202110974U/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2436537A1 (en) * | 1974-02-16 | 1975-08-21 | Transformatoren Union Ag | Soldering contact-tracks onto sliding rings - solder laid into groove underneath ring of step-switch selectors, then heated |
| DE2536771A1 (en) * | 1975-08-19 | 1977-03-03 | Transformatoren Union Ag | Electrical contacts for tap changers or stepping switches - using silver deposits on all moving and stationary contact surfaces |
| DE3833126A1 (en) * | 1988-09-29 | 1990-04-05 | Siemens Ag | LOAD SELECTOR FOR STAGE TRANSFORMERS |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013107545A1 (en) * | 2013-07-16 | 2015-01-22 | Maschinenfabrik Reinhausen Gmbh | load selector |
| DE102013107545B4 (en) | 2013-07-16 | 2017-02-16 | Maschinenfabrik Reinhausen Gmbh | load selector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN202110974U (en) | 2012-01-11 |
| DE202011000963U1 (en) | 2011-10-24 |
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