CA1068340A - Switching arrangement for transformer windings - Google Patents
Switching arrangement for transformer windingsInfo
- Publication number
- CA1068340A CA1068340A CA267,431A CA267431A CA1068340A CA 1068340 A CA1068340 A CA 1068340A CA 267431 A CA267431 A CA 267431A CA 1068340 A CA1068340 A CA 1068340A
- Authority
- CA
- Canada
- Prior art keywords
- winding
- distinct
- tap
- windings
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a three-phase, dual-voltage electro-magnetic induction apparatus wherein each phase has a primary winding and a secondary winding, and each phase of the primary winding comprises two separate and distinct windings, a switching arrangement com-prising tap changers for connecting said distinct windings in either a series or a parallel connection so as to alter the voltage rating of the primary winding between a first level and a second level.
These same tap changers also function to provide the "fine" adjustment of the voltage rating that tap changers are normally noted for.
In a three-phase, dual-voltage electro-magnetic induction apparatus wherein each phase has a primary winding and a secondary winding, and each phase of the primary winding comprises two separate and distinct windings, a switching arrangement com-prising tap changers for connecting said distinct windings in either a series or a parallel connection so as to alter the voltage rating of the primary winding between a first level and a second level.
These same tap changers also function to provide the "fine" adjustment of the voltage rating that tap changers are normally noted for.
Description
~ 683~ Case 252~
This invention relates to a switching arrangement for an electromagnetic induction device, and more particularly to an improved switching ar-rangement for use in a dual voltage transformer having tap changing capability.
As is well known to those s~illed in the transormer art, it is a common practice to provide transformers which have a dual voltage rating. In general, the term "dual voltage rating" is applied to trans~ormers which are provided with a low voltage setting (or level) and a high voltage setting (or level). It is to be understood that the low voltage setting may comprise more than one low voltage rating and the high voltage setting more than one high voltage rating. In general, the dual voltage of the dual voltage transformer is provided by means of a multiple primary winding which may be connected in either series or in parallel to provide the desired voltage rating ~or the trans~rmer. For example, ! 20 a transformer primary may be provided with two 12 KV windings. When these two windings are connected in parallel the voltage rating of the primary of the transformer will be 12 KV. However, when the two windings are connected in series, the transformer primary will have a voltage rating of 2 x 12 KV or 24 KV.
By the use of a series-parallel terminal board, the appropriate interconnections between the windings can be made. In simplistic terms the series-parallel terminal board comprises a board havingelectrically conducting studs located thereon. The studs are attached, by electrical conductors, to .,~ ^ ~ ~
1~834~ Case 2524 -to the ends o~ the primary windings. By using electrically conducting "links" the studs can be jumpered (or interconnected) in a certain manner to provide the required series or parallel connection.
The disadvantage of such a system is that the terminal board is located inside the transformer tank, and the board is commonly submerged in the transformer oil. Consequently, if a change in voltage is to be made, the transformer must be opened, the oil level must be lowered and then the adjustment can be made.
It is readily apparent that this is not a convenient method and can easily lead to contamination of the transformer oil.
To provide a more convenient method of changing the voltage rating of the transformer it has been ; known to employ a series-parallel switch in lieu of the previously mentioned series-parallel terminal board. The series-parallel switch can be operated externally of the transformer tank and consequently the trans~ormer need not be opened to be adjusted. The drawback with this arrangement is that the series-parallel switch is expensive. With either the series-parallel terminal board or the series-parallel switch the voltage can also be adjusted in small increments by the use of tap changers, as is well known.
The present invention overcomes the problems of the prior art methods by employing at least three tap changers to ad~ust the voltage rating of the transformer. These tap changers function no only to change the series~parallel connection of the windings, but also to provide the fine voltage adjustments 106~ Case 2524 at each voltage setting that tap changers are generally noted for.
Statecl in other terms, in a three-phase, dual-voltage electromagnetic induction apparatus having for each phase a primary winding and a se-condary winding, and each phase of the primary winding comprising a first and a second separate and distinct winding, switching means for connecting the first and second distinct windings in one of either a series or a parallel connection so as to alter the voltage rating of the primary winding between a first and a second level, the switching means comprising:
a) at least first, second, and third three-phase tap changers; b) the first tap changer being interconnected so as to connect, in each phase, the first end of the second distinct winding either to the first end of the first distinct winding, for a parallel connection of the first and second distinct windings, or to the taps on the second end of the first distinct winding, for a series connection of the ~irst and second distinct wi.ndings; c) the second tap changer being interconnected 50 as to connect, in each phase, the taps on the second end of the second distinct winding to the taps on the second end of the first distinct winding, for a parallel connection of the first and second distinct windings, and making no interconnections for a series connection~ of the first and second distinct windings; and d) the third tap changer being interconnected so as to connect.
in each phase, the taps on the second end of the second dist1nct winding to an output termina~. of the pri.mar~
wlndlny .
~83~0 Case 2524 The invention will now be described in more detail with reference to the ollowing drawings in which:
Figure 1 is a schematic representation of a typical three-phase transformer winding with which the invention is employed;
Figure 2 is a schematic representation of three tap changers and their interconnections to one phase of the primary winding shown in Figure 1, according to the present invention;
One preferred embodiment of the present invention will now be described with reference to Figures 1 and 2. Figure 1 depicts. schematically a t~pical transformer winding 10 having a three-phase pri~lary winding~ll and a three-phase secondary i winding 12. Primary winding 11 cornprises six separate and distinct windings 13a, 13b, 14a, 14b, 15a, and 15b (two for each phase of a three--phase system).
Winding 13a has a first end indicated by the letter a and a second end indicated by the l~tter d; winding 13a also has two taps indicated by the letters b and ; c near the second end of the winding. Similarly, winding 13b has a first end indicated by the letter e and a second end indicated by the letter h; winding 13b also has two taps indicated by the letters f and g near the second end of the winding. For convenience sake, the ends d and h as well as the taps b, c, f and g will all be referred to as taps to simplify this description.
Windings 13a and 13b can be connected in a series circuit relationship by interconnecting one of taps b, c, and d of winding 13a to end e of winding _~~
~ 06~ Case 2524 13b and by also interconnectiny one of taps f, g, and h to the output terminal k of primary winding 11.
This results in windings 13a and 13b (in series) forming one phase o~ primary winding 11. When windings 13a and 13b are so connected in series (and likewise winding 14a in series with winding 14b, and winding 15a in series with 15b) the voltage rating o:E the primary winding 11 oE the transformer will be referred to as the "high" voltage level, as opposed to the "low" voltage level of primary winding 11 when the windings 13a and 13b are connected in parallel (and similarly 14a in parallel with 14b and 15a in parallel with 15b). The highest voltage rating of primary winding 11 is obtained when the windings 13a and 13b are series connected with tap d connected to end e and tap h connected to terminal k. Only windings 13a and 13b will be considered to simplify this description: it is to be understood that windings 14a and 14b, as well as windings 15a and 15b, will be interconnected in an analogous fashion to windings 13a and 13b. Other variations of the series inter-connection (e.g. connecting e to c rather than e to d) produce small discrete changes (i.e. lower) to the voltage rating of primary winding 11, but all the series interconnections produce what will be referred to as a "high" voltage level on winding 11 in contrast to the "low" voltage level obtained on primary winding 11 when windings 13a and 13b are connected in parallel.
When windings 13a and 13b are connected in a parallel circuit relationship, first end a of winding 13a is connected to first end e of winding ` ` ~o6~34~ Case 2524 13b. The taps are connected such that d, h and k are interconnected, or c, gr and k are interconnected, or b, f, and k are interconnected, depending upon the exact voltage rating desired on primary winding 11, Winding 13a is made as nearly identical as possible to winding 13b. Conse~uently, the relationship of the voltage rating oE primary winding 11, when windings 13a and 13b are connected in series, to the voltage on primary winding 11, when winaings 13a and 13b are connected in parallel, is 2:1.
The foregoing has been a brief description of a well known method of interconnnecting the various windings of a known transformer construction to produce a variety of different voltage ratings of the primary winding. Figure 2 depicts, in simplified form, the novel means of the present invention for accomplishing the aforementioned interconnection of the windings. In this preferred e~nbodiment, three tap changers are employed. Although each tap changer is for a three-phase application, only one phase of each tap changer is shown in Figure 2 to simplify the description. The remaining two phases of each tap changer ~unction in a completely analogous manner.
Figure 2 depicts one phase of each of tap changers 16, 17 and 18. Each tap changer 16, 17 and 18 has seven electricall~ conducting terminals each indicated as a small circle and enclosing a letter.
These letters correspond to the taps and ends of windings 13a and 13b of Figure 1. Each tap changer has six mechanical positions indicated on the Figure by the numerals 1 through 6. Each tap changer 16, 17 ~0~3~ Case 252~
and 18 has a shorting contact l9a, l9b, or l9c respectively which serves to provide an electrical connection between two adjacent terminals. Tap changer 16 is shown with its shoxting contact l9a in position
This invention relates to a switching arrangement for an electromagnetic induction device, and more particularly to an improved switching ar-rangement for use in a dual voltage transformer having tap changing capability.
As is well known to those s~illed in the transormer art, it is a common practice to provide transformers which have a dual voltage rating. In general, the term "dual voltage rating" is applied to trans~ormers which are provided with a low voltage setting (or level) and a high voltage setting (or level). It is to be understood that the low voltage setting may comprise more than one low voltage rating and the high voltage setting more than one high voltage rating. In general, the dual voltage of the dual voltage transformer is provided by means of a multiple primary winding which may be connected in either series or in parallel to provide the desired voltage rating ~or the trans~rmer. For example, ! 20 a transformer primary may be provided with two 12 KV windings. When these two windings are connected in parallel the voltage rating of the primary of the transformer will be 12 KV. However, when the two windings are connected in series, the transformer primary will have a voltage rating of 2 x 12 KV or 24 KV.
By the use of a series-parallel terminal board, the appropriate interconnections between the windings can be made. In simplistic terms the series-parallel terminal board comprises a board havingelectrically conducting studs located thereon. The studs are attached, by electrical conductors, to .,~ ^ ~ ~
1~834~ Case 2524 -to the ends o~ the primary windings. By using electrically conducting "links" the studs can be jumpered (or interconnected) in a certain manner to provide the required series or parallel connection.
The disadvantage of such a system is that the terminal board is located inside the transformer tank, and the board is commonly submerged in the transformer oil. Consequently, if a change in voltage is to be made, the transformer must be opened, the oil level must be lowered and then the adjustment can be made.
It is readily apparent that this is not a convenient method and can easily lead to contamination of the transformer oil.
To provide a more convenient method of changing the voltage rating of the transformer it has been ; known to employ a series-parallel switch in lieu of the previously mentioned series-parallel terminal board. The series-parallel switch can be operated externally of the transformer tank and consequently the trans~ormer need not be opened to be adjusted. The drawback with this arrangement is that the series-parallel switch is expensive. With either the series-parallel terminal board or the series-parallel switch the voltage can also be adjusted in small increments by the use of tap changers, as is well known.
The present invention overcomes the problems of the prior art methods by employing at least three tap changers to ad~ust the voltage rating of the transformer. These tap changers function no only to change the series~parallel connection of the windings, but also to provide the fine voltage adjustments 106~ Case 2524 at each voltage setting that tap changers are generally noted for.
Statecl in other terms, in a three-phase, dual-voltage electromagnetic induction apparatus having for each phase a primary winding and a se-condary winding, and each phase of the primary winding comprising a first and a second separate and distinct winding, switching means for connecting the first and second distinct windings in one of either a series or a parallel connection so as to alter the voltage rating of the primary winding between a first and a second level, the switching means comprising:
a) at least first, second, and third three-phase tap changers; b) the first tap changer being interconnected so as to connect, in each phase, the first end of the second distinct winding either to the first end of the first distinct winding, for a parallel connection of the first and second distinct windings, or to the taps on the second end of the first distinct winding, for a series connection of the ~irst and second distinct wi.ndings; c) the second tap changer being interconnected 50 as to connect, in each phase, the taps on the second end of the second distinct winding to the taps on the second end of the first distinct winding, for a parallel connection of the first and second distinct windings, and making no interconnections for a series connection~ of the first and second distinct windings; and d) the third tap changer being interconnected so as to connect.
in each phase, the taps on the second end of the second dist1nct winding to an output termina~. of the pri.mar~
wlndlny .
~83~0 Case 2524 The invention will now be described in more detail with reference to the ollowing drawings in which:
Figure 1 is a schematic representation of a typical three-phase transformer winding with which the invention is employed;
Figure 2 is a schematic representation of three tap changers and their interconnections to one phase of the primary winding shown in Figure 1, according to the present invention;
One preferred embodiment of the present invention will now be described with reference to Figures 1 and 2. Figure 1 depicts. schematically a t~pical transformer winding 10 having a three-phase pri~lary winding~ll and a three-phase secondary i winding 12. Primary winding 11 cornprises six separate and distinct windings 13a, 13b, 14a, 14b, 15a, and 15b (two for each phase of a three--phase system).
Winding 13a has a first end indicated by the letter a and a second end indicated by the l~tter d; winding 13a also has two taps indicated by the letters b and ; c near the second end of the winding. Similarly, winding 13b has a first end indicated by the letter e and a second end indicated by the letter h; winding 13b also has two taps indicated by the letters f and g near the second end of the winding. For convenience sake, the ends d and h as well as the taps b, c, f and g will all be referred to as taps to simplify this description.
Windings 13a and 13b can be connected in a series circuit relationship by interconnecting one of taps b, c, and d of winding 13a to end e of winding _~~
~ 06~ Case 2524 13b and by also interconnectiny one of taps f, g, and h to the output terminal k of primary winding 11.
This results in windings 13a and 13b (in series) forming one phase o~ primary winding 11. When windings 13a and 13b are so connected in series (and likewise winding 14a in series with winding 14b, and winding 15a in series with 15b) the voltage rating o:E the primary winding 11 oE the transformer will be referred to as the "high" voltage level, as opposed to the "low" voltage level of primary winding 11 when the windings 13a and 13b are connected in parallel (and similarly 14a in parallel with 14b and 15a in parallel with 15b). The highest voltage rating of primary winding 11 is obtained when the windings 13a and 13b are series connected with tap d connected to end e and tap h connected to terminal k. Only windings 13a and 13b will be considered to simplify this description: it is to be understood that windings 14a and 14b, as well as windings 15a and 15b, will be interconnected in an analogous fashion to windings 13a and 13b. Other variations of the series inter-connection (e.g. connecting e to c rather than e to d) produce small discrete changes (i.e. lower) to the voltage rating of primary winding 11, but all the series interconnections produce what will be referred to as a "high" voltage level on winding 11 in contrast to the "low" voltage level obtained on primary winding 11 when windings 13a and 13b are connected in parallel.
When windings 13a and 13b are connected in a parallel circuit relationship, first end a of winding 13a is connected to first end e of winding ` ` ~o6~34~ Case 2524 13b. The taps are connected such that d, h and k are interconnected, or c, gr and k are interconnected, or b, f, and k are interconnected, depending upon the exact voltage rating desired on primary winding 11, Winding 13a is made as nearly identical as possible to winding 13b. Conse~uently, the relationship of the voltage rating oE primary winding 11, when windings 13a and 13b are connected in series, to the voltage on primary winding 11, when winaings 13a and 13b are connected in parallel, is 2:1.
The foregoing has been a brief description of a well known method of interconnnecting the various windings of a known transformer construction to produce a variety of different voltage ratings of the primary winding. Figure 2 depicts, in simplified form, the novel means of the present invention for accomplishing the aforementioned interconnection of the windings. In this preferred e~nbodiment, three tap changers are employed. Although each tap changer is for a three-phase application, only one phase of each tap changer is shown in Figure 2 to simplify the description. The remaining two phases of each tap changer ~unction in a completely analogous manner.
Figure 2 depicts one phase of each of tap changers 16, 17 and 18. Each tap changer 16, 17 and 18 has seven electricall~ conducting terminals each indicated as a small circle and enclosing a letter.
These letters correspond to the taps and ends of windings 13a and 13b of Figure 1. Each tap changer has six mechanical positions indicated on the Figure by the numerals 1 through 6. Each tap changer 16, 17 ~0~3~ Case 252~
and 18 has a shorting contact l9a, l9b, or l9c respectively which serves to provide an electrical connection between two adjacent terminals. Tap changer 16 is shown with its shoxting contact l9a in position
2 and contact l9a is thus connecting first end e of winding 13b to tap d of winding ]3a. Similarly, the shorting contact l9b of tap changer 17 is shown in position 1 and contact l9b is thus connecting tap d of winding 13a to tap d of winding 13a (in otherwords, making no interconnection at all).
Similarly, the shorting contact l9c of tap changer 18 is shown in position 2 and contact l9c is thus connecting tap h of winding 13b to terminal k of primary winding 11. In cummary, tap changers 16, 17 and 18, as shown in Figure 2 are joining e-d and ]~-h and are thus connecting windings 13a and 13b in a series circuit relationship. The position of, and connection made by each tap changer 16, 17, and 18, is given in Figure 2, undqrneath the respective tap changer and under the headings "Position" and "Connect".
The first horizontal line in Figure 2 indicates the position and the connections made by the tap changers 16, 17 and 18 in their illustrated pcsition and results in the voltage rating indicated as HVl, The next four horizontal lines indicate four more possible arrangements of the tap changers to provide a series circuit relationship for windings 13a and 13b resulting in the voltage ratings HV2 to HV5. The last three horizontal lines of the chart indicate the settings of the tap changers to produce a parallel circuit 'relationship of windings 13a and 13b resulting in the voltage ratings LVl, LV2 and LV3. It should 10~3~0 Case 252~
be noted that the data given in Figure 2 must b~ read along a horizontal line to get the correct setting ~or each tap changer 16, 17 and 18. For example, to obtain a voltage rating HV5 on primary winding 11, tap changer 16 is set on position 6 and thus first end e is connected to tap b, tap changer 17 is set on position 1, with end d connected to end d (thus no effective interconnection is made), and tap changer 18 is set on position 6 and thus terminal k is connected to tap f.
The foregoing has been a description o~
the preferred embodiment of the present invention, as envisioned by the inventor. It is to be understood that the device depicted and described in this specification is for one specif c application of the invention onl~, and variations can be made therefrom depending upon the particular application. Accordingly, the device described herein should not be considered as a limitation of the invention in any manner whatsoever, bu~ rather, considered solely as an example for illustrative purposes.
Similarly, the shorting contact l9c of tap changer 18 is shown in position 2 and contact l9c is thus connecting tap h of winding 13b to terminal k of primary winding 11. In cummary, tap changers 16, 17 and 18, as shown in Figure 2 are joining e-d and ]~-h and are thus connecting windings 13a and 13b in a series circuit relationship. The position of, and connection made by each tap changer 16, 17, and 18, is given in Figure 2, undqrneath the respective tap changer and under the headings "Position" and "Connect".
The first horizontal line in Figure 2 indicates the position and the connections made by the tap changers 16, 17 and 18 in their illustrated pcsition and results in the voltage rating indicated as HVl, The next four horizontal lines indicate four more possible arrangements of the tap changers to provide a series circuit relationship for windings 13a and 13b resulting in the voltage ratings HV2 to HV5. The last three horizontal lines of the chart indicate the settings of the tap changers to produce a parallel circuit 'relationship of windings 13a and 13b resulting in the voltage ratings LVl, LV2 and LV3. It should 10~3~0 Case 252~
be noted that the data given in Figure 2 must b~ read along a horizontal line to get the correct setting ~or each tap changer 16, 17 and 18. For example, to obtain a voltage rating HV5 on primary winding 11, tap changer 16 is set on position 6 and thus first end e is connected to tap b, tap changer 17 is set on position 1, with end d connected to end d (thus no effective interconnection is made), and tap changer 18 is set on position 6 and thus terminal k is connected to tap f.
The foregoing has been a description o~
the preferred embodiment of the present invention, as envisioned by the inventor. It is to be understood that the device depicted and described in this specification is for one specif c application of the invention onl~, and variations can be made therefrom depending upon the particular application. Accordingly, the device described herein should not be considered as a limitation of the invention in any manner whatsoever, bu~ rather, considered solely as an example for illustrative purposes.
Claims (10)
1. An improved tap connecting arrangement for use in a three-phase, dual-voltage electromagnetic induction apparatus of the type having for each phase a primary winding and a secondary winding, each phase of said primary winding containing a first and a second separate and distinct winding, and a first tap changer for connecting said first and second distinct windings in one of either a series or a parallel connection so as to alter the voltage rating of said primary winding between a first level and a second level, wherein the improvement com-prises:
a) at least one second and one third three-phase tap changers for interconnecting between tap connections within the first and second windings;
b) said first tap changer being interconnected so as to connect, in each phase, a tap at a first end of said second distinct winding either to a tap at a first end of said first distinct winding for a parallel connection of said first and second distinct windings, or to at least one tap on a second end of said first distinct winding, for a series connection of said first and second distinct windings;
c) said second tap changer being interconnected so as to connect, in each phase, the at least one tap on a second end of said second distinct winding to the at elast one tap on the second end of said first distinct winding, for a parallel connection of said first and second distinct windings; and d) said third tap changer being interconnected so as to connect, in each phase, the at least one tap on the second end of said second distinct winding to an output terminal of said primary winding.
a) at least one second and one third three-phase tap changers for interconnecting between tap connections within the first and second windings;
b) said first tap changer being interconnected so as to connect, in each phase, a tap at a first end of said second distinct winding either to a tap at a first end of said first distinct winding for a parallel connection of said first and second distinct windings, or to at least one tap on a second end of said first distinct winding, for a series connection of said first and second distinct windings;
c) said second tap changer being interconnected so as to connect, in each phase, the at least one tap on a second end of said second distinct winding to the at elast one tap on the second end of said first distinct winding, for a parallel connection of said first and second distinct windings; and d) said third tap changer being interconnected so as to connect, in each phase, the at least one tap on the second end of said second distinct winding to an output terminal of said primary winding.
2. The device of claim 1 wherein said primary windings are connected in a star configuration and said secondary windings are connected in a star configuration; said output terminals, of each primary winding, are connected to a common neutral point of the primary windings, and a neutral point of said primary windings is electrically connected to a neutral point of said secondary windings.
3. The device of claim 1 and claim 2 wherein at least one of said tap changers includes at least one additional position so as to provide for an additional tap changing function.
4. The device of claim 1 wherein the second end of said first distinct winding has three taps and the second end of said second winding has three taps.
5. The device of claim 2 wherein each said tap changer has six mechanical positions.
6. The device of claim 2 wherein said first and said second distinct windings are essentially identical.
7. An improved tap coupling arrangement for use in a three-phase, dual-voltage electromagnetic induction apparatus of the type having for each phase a primary winding and a secondary winding, and each phase of said primary winding containing a first and a second separate and distinct winding, and a first tap changer for connecting said first and second distinct windings in one of either a series or a parallel connection so as to alter the voltage rating of said primary winding between a first level and a second level, and for providing the tap changing function of adjusting the voltage rating in small increments, the improvement comprising:
a) second and third tap changers for three-phase application;
b) said first tap changer being interconnected so as to connect, in each phase, a first end of said second distinct winding either to a first end of said first distinct winding, for a parallel connection of said first and second distinct windings, or to at least one tap on the second end of said first distinct winding, for a series connection of said first and second distinct windings;
c) said second tap changer being interconnected so as to connect, in each phase, at least one tap on the second end of said second distinct winding to the at least one tap on the second end of said first distinct winding, for a parallel connection of said first and second distinct windings, with no interconnections for a series connection of said first and second distinct windings; and d) said third tap changer being interconnected so as to connect, in each phase, at least one tap on the second end of said second distinct winding to an output terminal of said primary winding.
a) second and third tap changers for three-phase application;
b) said first tap changer being interconnected so as to connect, in each phase, a first end of said second distinct winding either to a first end of said first distinct winding, for a parallel connection of said first and second distinct windings, or to at least one tap on the second end of said first distinct winding, for a series connection of said first and second distinct windings;
c) said second tap changer being interconnected so as to connect, in each phase, at least one tap on the second end of said second distinct winding to the at least one tap on the second end of said first distinct winding, for a parallel connection of said first and second distinct windings, with no interconnections for a series connection of said first and second distinct windings; and d) said third tap changer being interconnected so as to connect, in each phase, at least one tap on the second end of said second distinct winding to an output terminal of said primary winding.
8. The device of claim 7 wherein said first and said second distinct windings have the same voltage rating, and the second end of each distinct winding has the same number of taps.
9. The device of claim 8 wherein the number of taps is three.
10. The device of claim 7, 8 or 9 wherein said primary windings are connected in a star configuration and said secondary windings are connected in a star configuration; said output terminals, of each primary winding, are connected to a common neutral point of the primary windings, and a neutral point of said primary windings is electrically connected to a neutral point of said secondary windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA267,431A CA1068340A (en) | 1976-12-08 | 1976-12-08 | Switching arrangement for transformer windings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA267,431A CA1068340A (en) | 1976-12-08 | 1976-12-08 | Switching arrangement for transformer windings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1068340A true CA1068340A (en) | 1979-12-18 |
Family
ID=4107471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA267,431A Expired CA1068340A (en) | 1976-12-08 | 1976-12-08 | Switching arrangement for transformer windings |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1068340A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202010016210U1 (en) * | 2010-11-30 | 2012-03-01 | Maschinenfabrik Reinhausen Gmbh | diverter |
-
1976
- 1976-12-08 CA CA267,431A patent/CA1068340A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202010016210U1 (en) * | 2010-11-30 | 2012-03-01 | Maschinenfabrik Reinhausen Gmbh | diverter |
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