CN114284048A - Test transformer combining self-coupling connection and coarse and fine voltage regulation modes - Google Patents
Test transformer combining self-coupling connection and coarse and fine voltage regulation modes Download PDFInfo
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- CN114284048A CN114284048A CN202011029524.5A CN202011029524A CN114284048A CN 114284048 A CN114284048 A CN 114284048A CN 202011029524 A CN202011029524 A CN 202011029524A CN 114284048 A CN114284048 A CN 114284048A
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Abstract
The invention relates to the field of transformers, in particular to a test transformer combining a self-coupling mode and a coarse and fine voltage regulation mode, which comprises a coarse regulation winding, a fine regulation winding, a transformer iron core and a coarse and fine regulation switch, wherein the coarse regulation winding and the fine regulation winding are wound on two columns of the transformer iron core, different coarse regulation windings are connected in parallel, the head end of each coarse regulation winding is led out to be used as a primary voltage input end, the tail end of each primary voltage and the tail end of each secondary voltage are the same, an output point a on the fine and fine regulation switch is led out to be used as the head end of each secondary voltage, the fine and fine regulation switch is provided with a plurality of contacts, the coarse adjustment winding is connected with a coarse adjustment winding contact through a coarse adjustment lead, the fine adjustment winding is connected with a fine adjustment winding contact through a fine adjustment lead, the switch coarse adjustment contact moves to be in contact with any coarse adjustment winding contact during voltage adjustment, and the switch fine adjustment contact moves to be in contact with any fine adjustment winding contact. The invention has the advantages of multiple voltage-regulating stages, large voltage-regulating range and small rated tapping impedance.
Description
Technical Field
The invention relates to the field of transformers, in particular to a test transformer combining a self-coupling mode and a coarse and fine voltage regulation mode.
Background
A high-current test transformer is used for supplying power in power supply equipment for a dynamic thermal stability test of a high-voltage electrical appliance, the high-current test transformer needs to meet the output of multiple stages (48 stages) of different voltages, the voltage regulating depth is more than 0-100% so as to meet the test requirements of different electrical equipment, and in addition, the requirement of minimum (close to zero) rated tapping impedance is also met. The prior art transformer device is difficult to meet the above requirements.
Disclosure of Invention
The invention aims to provide a test transformer combining a self-coupling connection mode and a coarse and fine voltage regulation mode, which has the advantages of multiple voltage regulation stages, large voltage regulation range and small rated tapping impedance.
The purpose of the invention is realized by the following technical scheme:
a test transformer combining self-coupling and coarse and fine voltage regulation modes comprises a coarse regulation winding, a fine regulation winding, a transformer iron core and a fine and fine regulation switch, wherein the transformer iron core comprises a column I and a column II, the column I and the column II are wound with the coarse regulation winding and the fine regulation winding, the coarse regulation winding on the column I and the coarse regulation winding on the column II are connected in parallel, the head end of the coarse regulation winding on the column I and the tail end of the coarse regulation winding on the column II are respectively led out to be used as an input end A of a primary voltage, the tail end of the input end A is led out to be used as an output end X of the primary voltage, the output end of the secondary voltage is the same as the output end of the primary voltage, an output point a on the coarse and fine regulation switch is led out to be used as an input end of a secondary voltage, the fine regulation switch is provided with a coarse regulation winding contact, a fine regulation winding contact, a coarse regulation winding contact, a fine regulation winding is respectively connected with each level regulation winding contact through a coarse regulation lead, and a fine regulation winding are respectively connected with each level regulation winding contact through a fine regulation lead, during voltage regulation, the switch coarse regulation contact moves and is in contact with any coarse regulation winding contact, and the switch fine regulation contact moves and is in contact with any fine regulation winding contact.
The coarse tuning winding comprises four stages of windings, 5 coarse tuning winding contacts are correspondingly arranged on the coarse and fine tuning switch, 9 tapping connections are arranged on the fine tuning winding, and 10 fine tuning winding contacts are correspondingly arranged on the coarse and fine tuning switch.
The first stage of the coarse and fine adjustment switch is locked.
The coarse adjusting winding is arranged on the inner side of the corresponding fine adjusting winding, the windings on the first column are wound on the left side, and the windings on the second column are wound on the right side.
The coarse tuning winding, the fine tuning winding, the transformer iron core and the coarse and fine tuning switches are all arranged in a transformer shell, and a primary side sleeve and a secondary side sleeve are arranged on the upper side of the transformer shell.
The invention has the advantages and positive effects that:
1. when the invention is used, the primary voltage U1 is the voltage of the coarse regulating winding and is constant, the secondary voltage U2 is the voltage of the coarse regulating winding and the voltage of the fine regulating winding, the adjustment can be realized by the movement of the switch coarse regulating contact and the switch fine regulating contact, the voltage regulating stages are multiple (48 stages) and the voltage regulating range is large (more than 0-100%).
2. When the fine-tuning contact of the switch slides to the position shown in figure 2, the fine-tuning winding does not participate in the operation of the transformer, the next voltage and the secondary voltage of rated tapping are equal, the current flowing through the coarse-tuning winding is zero, the electric leakage reactance and the loss of the coarse-tuning winding are both zero, and the requirement that the impedance of the rated tapping is minimum (close to zero) is met.
3. The invention realizes the use requirement and the performance requirement of the equipment and simultaneously realizes the win-win of enterprise benefit and social benefit.
Drawings
Figure 1 is a schematic diagram of the principle of the present invention,
figure 2 is a schematic diagram of the principle of the present invention two,
figure 3 is a schematic diagram of the coarse and fine tuning windings of the present invention wound around a transformer core,
figure 4 is a schematic wiring diagram of the coarse and fine tuning windings and the coarse and fine tuning switches of the present invention,
figure 5 is a schematic diagram of a primary lead of the present invention,
figure 6 is a schematic diagram of a secondary lead of the present invention,
fig. 7 is a schematic view of the bushing arrangement of the present invention.
The transformer comprises a primary coarse adjusting winding 1, a secondary coarse adjusting winding 2, a tertiary coarse adjusting winding 3, a quaternary coarse adjusting winding 4, a fine adjusting winding 5, a fine adjusting contact 6, a fine adjusting contact 7, a coarse adjusting contact 8, a coarse adjusting winding 9, a secondary side sleeve 9, a transformer iron core 10, a fine adjusting switch 11, a primary tail end leading-out cable 12, a primary head end leading-out cable 13, a coarse adjusting lead 14, a fine adjusting lead 15, a secondary head end leading-out cable 16, a secondary tail end leading-out cable 17, a primary side sleeve 18, a coarse adjusting winding contact 19 and a fine adjusting winding contact 20.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 7, the present invention includes a coarse adjustment winding 8, a fine adjustment winding 5, a transformer core 10 and a fine and fine adjustment switch 11, wherein as shown in fig. 3, the transformer core 10 adopts a single-phase two-column (i column and ii column) structure, and each column is wound with the coarse adjustment winding 8 and the fine adjustment winding 5, the two column windings are the same, and the coarse adjustment winding 8 is arranged inside the fine adjustment winding 5, and the two columns are connected in parallel with a wire, wherein the windings on the i column are left-wound, and the windings on the ii column are right-wound.
As shown in fig. 1 to 7, the coarse and fine tuning switch 11 is provided with a coarse tuning winding contact 19, a fine tuning winding contact 20, a coarse tuning switching contact 7 and a fine tuning switching contact 6, each winding of the coarse tuning winding 8 is connected with a corresponding coarse tuning winding contact 19 on the coarse and fine tuning switch 11 through a coarse tuning lead 14, each winding of the fine tuning winding 5 is connected with a corresponding fine tuning winding contact 20 on the coarse and fine tuning switch 11 through a fine tuning lead 15, the coarse tuning switching contact 7 moves and contacts with any coarse tuning winding contact 19 during tuning, the fine tuning switching contact 6 moves and contacts with any fine tuning winding contact 20, wherein a primary voltage U1 is the sum of the voltages of each winding of the coarse tuning winding 8 and is constant, a secondary voltage U2 is the voltage of the coarse tuning winding 8 plus the voltage of the fine tuning winding 5, and moves and is adjustable through the coarse switching contact 7 and the fine tuning switching contact 6, when the fine-tuning contact 6 of the switch slides to the position shown in fig. 2, all the taps of the fine-tuning winding 5 are thrown away and do not participate in the operation of the transformer, at this time, the primary voltage U1 is equal to the secondary voltage U2, the primary current I1 is equal to the secondary current I2, but the direction of the primary current is opposite to that of the secondary current I2, the current flowing through the coarse-tuning winding 8 is zero, the leakage reactance of the coarse-tuning winding 8 is zero, the reactance of the transformer is the leakage reactance of the lead wire reactance and other components, the value is small, in addition, the current of the coarse-tuning winding 8 is zero, the loss of the coarse-tuning winding 8 is also zero, and the loss of the transformer is only the loss of the lead wire connected outside the winding, and the same value is small.
In this embodiment, 48 levels of voltage regulation can be achieved, wherein as shown in fig. 1 to 2, the coarse regulating winding 8 includes a first-level coarse regulating winding 1, a second-level coarse regulating winding 2, a third-level coarse regulating winding 3 and a fourth-level coarse regulating winding 4, 5 coarse regulating winding contacts 19 are correspondingly arranged on the coarse and fine regulating switch 11, 9 taps are arranged on the fine regulating winding 5, 10 fine regulating winding contacts 20 are correspondingly arranged on the coarse and fine regulating switch 11, 10 levels of voltage regulation can be achieved, 5 (coarse regulating winding contacts) × 10 (fine regulating winding contacts) × 1-49 levels of voltage regulating range can be achieved in total, in order to meet the requirement of 48 levels of voltage regulation required by a user, the first-level lock of the coarse and fine regulating switch 11 is locked, does not participate in voltage regulation, and a primary voltage U1 and a secondary voltage U2 are ensured to be equal when the situation shown in fig. 2, so that the current in the coarse regulating winding 8 is zero, the impedance is minimum, and the loss is minimum.
The thickness adjusting switch 11 is an on-load tap changer, and in this embodiment, the manufacturer of the thickness adjusting switch 11 is a Guizhou long-standing switch with a model number of ZMT I1200-40.5/B-10491G 49.
The connection relationship between the coarse adjusting winding 8 and the fine adjusting winding 5 and the coarse adjusting switch 11 is shown in fig. 4, wherein the coarse adjusting winding 8 on the column I and the coarse adjusting winding 8 on the column II are connected in parallel, the head end of the coarse adjusting winding 8 on the column I and the head end of the coarse adjusting winding 8 on the column II are led out together to be used as an input end A of primary voltage, the tail end of the coarse adjusting winding 8 on the column I and the tail end of the coarse adjusting winding 8 on the column II are led out together to be used as an output end X of the primary voltage, each level of coarse adjusting winding is respectively connected with a corresponding coarse adjusting winding contact 19 on the coarse adjusting switch 11 through a coarse adjusting lead 14, the fine adjusting winding 5 on the column I and the fine adjusting winding 5 on the column II are both provided with 9 fine adjusting taps to realize 10 levels of voltage adjustment, each level of the fine adjusting winding 5 is respectively connected with a corresponding fine adjusting winding contact 20 on the coarse adjusting switch 11 through a fine adjusting lead 15 and is used as an adjustable part of secondary voltage U2 together with the coarse adjusting winding 8, the invention is an autotransformer, the primary voltage output end and the secondary voltage output end are the same point (X and X), and the output point a on the thickness adjusting switch 11 is led out to be used as the secondary voltage input end.
As shown in fig. 5 to 7, the coarse tuning winding 8, the fine tuning winding 5, the transformer core 10 and the fine tuning switch 11 are all disposed in a transformer housing, and a primary side bushing 18 and a secondary side bushing 9 are disposed on the upper side of the transformer housing, wherein as shown in fig. 5, coarse tuning leads 14 led out from each stage of coarse tuning winding on the column i and each stage of coarse tuning winding on the column ii are respectively connected into the fine tuning switch 11 according to the leading labels, a primary leading-out cable 13 and a primary trailing-out cable 12 on each column of coarse tuning winding 8 are led out from the primary side bushing 18, as shown in fig. 6, fine tuning leads 15 led out from each stage of fine tuning winding on the column i and each stage of fine tuning winding on the column ii are respectively connected into the fine tuning switch 11 according to the leading labels, thereby realizing the adjustment of the tapping voltages on the secondary side, a secondary leading-out cable 16 and a secondary trailing-out cable 17 are led out from the secondary side bushing 9, the secondary head end lead-out cable 16 is connected with an output point a on the thickness adjusting switch 11, and a tail end connection point X after the secondary tail end lead-out cable 17 is led out is the same as a tail end connection point X after the primary tail end lead-out cable is led out.
The working principle of the invention is as follows:
as shown in fig. 1-2, when the present invention works, the primary voltage U1 is the voltage of the coarse tuning winding 8 and is constant, the secondary voltage U2 is the voltage of the coarse tuning winding 8 plus the voltage of the fine tuning winding 5, which is movable and adjustable through the coarse tuning contact 7 and the fine tuning contact 6, the number of the voltage-adjusting stages is multiple (48 stages) and the voltage-adjusting range is large (0% -100%), in addition, when the fine tuning contact 6 slides to the position of fig. 2, the fine tuning winding 5 does not participate in the transformer operation, at this time, the primary voltage U1 is equal to the secondary voltage U2, the primary current I1 is equal to the secondary current I2, but the directions are opposite, the current flowing through the coarse tuning winding 8 is zero, the leakage reactance of the coarse tuning winding 8 is zero, the value is small, in addition, the current of the coarse tuning winding 8 is zero, the loss of the coarse tuning winding 8 is also zero, the loss of the transformer is the loss of the external connecting lead of the winding, and the same value is very small.
Claims (5)
1. A test transformer combining self coupling connection and coarse and fine voltage regulation modes is characterized in that: the transformer comprises a coarse adjustment winding (8), a fine adjustment winding (5), a transformer iron core (10) and a coarse and fine adjustment switch (11), wherein the transformer iron core (10) comprises a column I and a column II, the coarse adjustment winding (8) and the fine adjustment winding (5) are wound on the column I and the column II, the coarse adjustment winding (8) on the column I and the coarse adjustment winding (8) on the column II are connected in parallel, the head end of the input end A is led out to be used as a primary voltage, the tail end of the input end A is led out to be used as an output end X of the primary voltage, the output end of the secondary voltage is the same as the output end of the primary voltage, an output point a on the coarse and fine adjustment switch (11) is led out to be used as an input end of the secondary voltage, the coarse and fine adjustment switch (11) is provided with a coarse adjustment winding contact (19), a fine adjustment winding contact (20), a switch coarse adjustment contact (7) and a switch fine adjustment contact (6), each level of windings of the coarse adjustment winding (8) are respectively connected with the corresponding coarse adjustment winding (19) through a coarse adjustment lead (14), each level of winding of the fine adjustment winding (5) is connected with a corresponding fine adjustment winding contact (20) through a fine adjustment lead (15), the switch coarse adjustment contact (7) moves and is in contact with any coarse adjustment winding contact (19) during voltage adjustment, and the switch fine adjustment contact (6) moves and is in contact with any fine adjustment winding contact (20).
2. The test transformer combining the self-coupling and the coarse and fine voltage regulation according to claim 1, characterized in that: the coarse adjusting winding (8) comprises four-stage windings, 5 coarse adjusting winding contacts (19) are correspondingly arranged on the coarse and fine adjusting switch (11), 9 tapping connections are arranged on the fine adjusting winding (5), and 10 fine adjusting winding contacts (20) are correspondingly arranged on the coarse and fine adjusting switch (11).
3. The test transformer combining the self-coupling and the coarse and fine voltage regulation according to claim 2, characterized in that: the thickness adjusting switch (11) is locked at the first stage.
4. The test transformer combining the self-coupling and the coarse and fine voltage regulation according to claim 1, characterized in that: the coarse adjusting winding (8) is arranged on the inner side of the corresponding fine adjusting winding (5), the windings on the column I are wound on the left side, and the windings on the column II are wound on the right side.
5. The test transformer combining the self-coupling and the coarse and fine voltage regulation according to claim 1, characterized in that: the coarse adjusting winding (8), the fine adjusting winding (5), the transformer iron core (10) and the coarse and fine adjusting switch (11) are all arranged in a transformer shell, and a primary side sleeve (18) and a secondary side sleeve (9) are arranged on the upper side of the transformer shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011029524.5A CN114284048A (en) | 2020-09-27 | 2020-09-27 | Test transformer combining self-coupling connection and coarse and fine voltage regulation modes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011029524.5A CN114284048A (en) | 2020-09-27 | 2020-09-27 | Test transformer combining self-coupling connection and coarse and fine voltage regulation modes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114284048A true CN114284048A (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011029524.5A Pending CN114284048A (en) | 2020-09-27 | 2020-09-27 | Test transformer combining self-coupling connection and coarse and fine voltage regulation modes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114284048A (en) |
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2020
- 2020-09-27 CN CN202011029524.5A patent/CN114284048A/en active Pending
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