CN210200527U - On-load tap changing transformer - Google Patents
On-load tap changing transformer Download PDFInfo
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- CN210200527U CN210200527U CN201921530729.4U CN201921530729U CN210200527U CN 210200527 U CN210200527 U CN 210200527U CN 201921530729 U CN201921530729 U CN 201921530729U CN 210200527 U CN210200527 U CN 210200527U
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Abstract
The utility model discloses an on-load tap changing transformer contains a main transformer and a tap changing transformer, the former limit of main transformer be connected with electric wire netting AX, the vice limit of main transformer with tap changing transformer's vice limit end to end establish ties, tap changing transformer on have a N tap. Because the small-sized regulating transformer is adopted, the required on-load voltage regulation can be realized only by implementing corresponding connection of the primary side of the regulating transformer and the primary side of the main transformer through one selection circuit. For some transformers with smaller capacity, the transformer is simpler, more economical, more reliable and smaller in size.
Description
Technical Field
The utility model relates to a transformer, more precisely, be a transformer on-load voltage regulation method and device.
Background
When the transformer runs under load, on one hand, the impedance of the transformer can generate voltage drop on a transformer body and a line, and on the other hand, the system voltage also fluctuates up and down, so that the secondary side voltage of the secondary side of the transformer cannot reach a required value. In order to regulate the voltage of the load without power interruption and ensure that the output secondary side voltage is in a specified range, a user can select an on-load tap changer to carry out on-load tap regulation on the voltage of the transformer so as to ensure that the output voltage reaches a stable value.
As shown in fig. 1, a conventional on-load tap changing transformer is configured such that a tap changing coil or a tap is disposed on a high-voltage coil side of a transformer 1, that is, corresponding number of turns is set according to a corresponding voltage fluctuation value, and the corresponding number of turns on the high-voltage coil is selected by an on-load tap changing switch 2, so as to change an output voltage and achieve a purpose of stabilizing the output voltage. At present, the on-load tap changer at home and abroad is only used for high voltage (6KV and above) and small current (below 1000A), and for transformers with low voltage (below 1 KV) and large current (above 1000A) on the original secondary side, the on-load tap changer is difficult to manufacture due to large current, and the process is difficult to realize.
In addition, the conventional on-load voltage regulation of the transformer can be realized only by an on-load voltage regulation tap switch, and the on-load voltage regulation tap switch comprises a motor, a driving mechanism, a voltage regulation circuit, a selection circuit, a transition circuit and the like, has a more complex structure, and can generate electric arcs during voltage regulation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses solve the technical problem that prior art exists to a transformer on-load voltage regulation method and device are provided.
The above technical problem of the present invention can be solved by the following technical solutions:
an on-load tap changer comprises a main transformer and a tap changer, wherein the primary side of the main transformer is connected with a power grid AX, the secondary side of the main transformer is connected with the secondary side of the tap changer end to end in series, wherein,
when the homonymous ends of the primary sides of the regulating transformer and the main transformer are connected to the power grid AX in parallel in the same direction, the output voltage U of the on-load regulating transformer is U1+ U2;
when the homonymous ends of the primary sides of the regulating transformer and the main transformer are reversely connected to the power grid AX in parallel, the output voltage U of the on-load regulating transformer is U1-U2;
when the primary side of the voltage regulating transformer is suspended, the output voltage U of the on-load voltage regulating transformer is U1;
wherein, U1 is the secondary side voltage of the main transformer, and U2 is the secondary side voltage of the regulating transformer.
An on-load tap changing transformer comprises a main transformer and a tap changing transformer, wherein the primary side of the main transformer is connected with a power grid AX, the secondary side of the main transformer is connected with the secondary side of the tap changing transformer in series end to end, the tap changing transformer is provided with N taps, wherein,
when the homonymous ends of the primary sides of the regulating transformer and the main transformer are connected to the power grid AX in parallel in the same direction, the output voltage U of the on-load regulating transformer is U1+ U2/K, wherein K is 1,2, … … and N;
when the homonymous ends of the primary sides of the regulating transformer and the main transformer are reversely connected to the power grid AX in parallel, the output voltage U of the on-load regulating transformer is U1-U2/K, wherein K is 1,2, … … and N;
when the primary side of the voltage regulating transformer is suspended, the output voltage U of the on-load voltage regulating transformer is U1;
the U1 is the secondary side voltage of the main transformer, and the U2 is the secondary side voltage corresponding to one tap of the regulating transformer.
A voltage regulation method of an on-load tap-changing transformer comprises a main transformer and a tap-changing transformer, wherein the primary side of the main transformer is connected with a power grid AX, the secondary side of the main transformer is connected with the secondary side of the tap-changing transformer in series end to end, N taps are arranged on the tap-changing transformer, and the voltage regulation method comprises the following steps:
s1, when the homonymous ends of the primary sides of the regulating transformer and the main transformer are connected to a power grid AX in parallel in the same direction, the output voltage U of the on-load tap changing transformer is U1+ U2/K, wherein K is 1,2, … … and N;
s2, when the primary sides of the regulating transformer and the main transformer are connected with the same-name end in parallel in the power grid AX in an opposite mode, the output voltage U of the on-load regulating transformer is U1-U2/K, wherein K is 1,2, … … and N;
s3, hanging the primary side of the regulating transformer in the air, wherein the output voltage U of the on-load regulating transformer is U1;
the U1 is the secondary side voltage of the main transformer, and the U2 is the secondary side voltage corresponding to one tap of the regulating transformer.
The utility model discloses a transformer on-load voltage regulation method and device has following advantage: because the small-sized regulating transformer is adopted, the required on-load voltage regulation can be realized only by implementing corresponding connection of the primary side of the regulating transformer T2 and the primary side of the main transformer T1 through one selection circuit, and compared with the traditional on-load regulating transformer, the on-load voltage regulation transformer is simpler, more economic and more reliable and has smaller volume.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional voltage regulation of a transformer;
fig. 2 is a schematic structural diagram of the transformer of the present invention;
fig. 3 is a schematic diagram of voltage regulation connection of the transformer of the present invention;
fig. 4 is a schematic diagram of voltage regulation of the transformer of the present invention, at this time, the output voltage is the sum of the secondary side voltages of the main transformer and the regulating transformer;
fig. 5 is a schematic diagram of voltage regulation of the transformer of the present invention, at this time, the output voltage is the difference between the secondary side voltages of the main transformer and the regulating transformer;
fig. 6 is a schematic diagram of voltage regulation of the transformer of the present invention, at this time, the output voltage is the secondary side voltage of the main transformer;
fig. 7 is a schematic structural diagram of another embodiment of the transformer of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.
As shown in fig. 2 and 3, the on-load tap changer includes a main transformer T1 and a tap changer T2, the primary side of the main transformer T1 is connected to the grid AX, the secondary side of the main transformer T1 is connected in series end to end with the secondary side of the tap changer T2, wherein,
as shown in fig. 4, when the primary side terminals of the tap changing transformer T2 and the main transformer T1 are connected in parallel to the grid AX in the same direction, the output voltage U of the on-load tap changing transformer is U1+ U2;
as shown in fig. 5, when the dotted terminals of the primary sides of the tap changing transformer T2 and the main transformer T1 are connected in inverse parallel to the grid AX, the output voltage U of the on-load tap changing transformer is U1-U2;
as shown in fig. 6, when the primary side of the tap changing transformer T2 is floating, the output voltage U of the on-load tap changing transformer is U1.
U1 is the secondary side voltage of the main transformer T1, and U2 is the secondary side voltage of the regulating transformer T2.
Since the secondary side of the tap transformer T2 and the primary side of the main transformer T1 are always connected in series and the primary side of the main transformer T1 is also always connected to the grid, the secondary side voltage U1 of the main transformer T1 is always present. When the regulator transformer T2 is connected in different ways, the secondary side voltage U2 of the regulator transformer T2 is changed, and the voltage U changes along with the change of the U2, so that the function of regulating the voltage of the transformer without power interruption is realized, and the purpose of on-load voltage regulation is achieved.
As shown in fig. 7, in contrast to the previous embodiment, there are N taps on the tap transformer T2, wherein,
when the primary sides of the regulating transformer T2 and the main transformer T1 are connected in parallel to the power grid AX in the same direction, the output voltage U of the on-load tap changer is U1+ U2/K, wherein K is 1,2, … …, N;
when the dotted terminals of the primary sides of the tap changing transformer T2 and the main transformer T1 are connected in parallel to the grid AX in the opposite direction, the output voltage U of the on-load tap changing transformer is U1-U2/K, where K is 1,2, … …, N;
when the primary side of the regulating transformer T2 is suspended, the output voltage U of the on-load tap-changing transformer is U1.
U1 is the secondary side voltage of the main transformer, and U2 is the secondary side voltage corresponding to one tap of the regulating transformer.
By connecting different tap positions, a plurality of voltage outputs are provided, and the function of fine voltage regulation can be achieved. The tap changer T2 has N taps, and the transformer voltage output U has 2N +1 voltage values. Where N voltages are greater than U1, N voltages are less than U1, and one voltage is equal to U1.
Since the secondary side of the regulating transformer T2 is connected in series with the secondary side of the main transformer T1, the currents I1 and I2 flowing through the secondary sides of the main transformer T1 and the regulating transformer T2 are the same, and the secondary side voltage value U2 of the regulating transformer T2 is the required maximum tapping voltage of the main transformer.
If the maximum adjustment range required by the main transformer T1 is M%, U2 is U1 × M%, and the tap transformer capacity S2 is U2 × I2, it can be seen that the capacity of the tap transformer is M% of the main transformer capacity. Therefore, the capacity of the regulating transformer is selected according to the maximum voltage-regulating tapping percentage of the main transformer. Normally, the maximum voltage regulation range of the main transformer is +/-10%, the capacity of the voltage regulation transformer is 10% of the capacity of the main transformer, the diameter of an iron core of the voltage regulation transformer T2 is far smaller than that of an iron core of the main transformer (about 50-60% of the iron core of the main transformer), and the traditional voltage regulation tapping coil is moved to the voltage regulation transformer T2 from the main transformer, so that compared with the traditional on-load voltage regulation transformer, the on-load voltage regulation transformer has the advantages of smaller volume, more material saving and more convenience, and the cost of the voltage regulation transformer is about 10-18% of the cost of directly winding the main transformer.
Because of the adoption of the small-sized regulating transformer, the required on-load voltage regulation can be realized only by implementing corresponding connection of the primary side of the regulating transformer T2 and the primary side of the main transformer T1 through a selection circuit. For some transformers with smaller capacity, the transformer is simpler, more economical, more reliable and smaller in size. Compared with the traditional on-load voltage regulation method, the price of the on-load voltage regulation tap switch is far higher than that of a main transformer, and the volume of the on-load voltage regulation tap switch is also larger than that of the main transformer, particularly a dry type transformer.
The utility model discloses an on-load tap changing transformer has following advantage:
1. the function that the low-voltage and high-current transformers cannot be subjected to on-load voltage regulation at home and abroad at present is realized;
2. the main transformer does not need to be added with a tap for leading out, and is realized by a small-sized regulating transformer, so that the overall manufacturing cost is lower, the structure is simpler and the size is small;
3. because the head and the tail of the voltage regulating transformer can be positively and negatively connected, a fractional tap can realize positive and negative voltage output, and compared with the tapping series of the traditional on-load voltage regulation, the tapping of nearly 50 percent of taps is reduced;
4. the special on-load tap changer is not needed, and the method has the advantages of simplicity, economy, reliability, small volume, small occupied area and the like.
5. The voltage regulating function is realized by the small-sized regulating transformer, so the voltage regulating transformer has wider application range, can be used for not only newly manufactured transformers, but also transformers in operation and the upgrading and reconstruction of old transformers, and the original transformers do not need any internal modification.
6. The transformer is suitable for oil immersed transformers, dry transformers and other special transformers.
Without being limited thereto, any changes or substitutions which are not thought of through creative efforts should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (2)
1. An on-load tap changer comprising a main transformer (T1) and a tap changer (T2), the primary side of said main transformer (T1) being connected to the grid AX, the secondary side of said main transformer (T1) being connected in series end to end with the secondary side of said tap changer (T2), wherein,
when the primary ends of the regulating transformer (T2) and the main transformer (T1) are connected in parallel to the power grid AX in the same direction, the output voltage U of the on-load tap changing transformer is U1+ U2;
when the primary side homonymous ends of the regulating transformer (T2) and the main transformer (T1) are connected to the power grid AX in an inverse parallel mode, the output voltage U of the on-load tap changing transformer is U1-U2;
when the primary side of the voltage regulating transformer (T2) is suspended, the output voltage U of the on-load voltage regulating transformer is U1;
wherein, U1 is the secondary side voltage of the main transformer (T1), and U2 is the secondary side voltage of the regulating transformer (T2).
2. An on-load tap changer comprising a main transformer (T1) and a tap changer (T2), the primary side of said main transformer (T1) being connected to the grid AX, the secondary side of said main transformer (T1) being connected in series end to end with the secondary side of said tap changer (T2), said tap changer (T2) having N taps, wherein,
when the primary ends of the regulating transformer (T2) and the main transformer (T1) are connected in parallel to the power grid AX in the same direction, the output voltage U of the on-load tap changing transformer is U1+ U2/K, wherein K is 1,2, … …, N;
when the primary side homonymous ends of the regulating transformer (T2) and the main transformer (T1) are connected to the power grid AX in an inverse parallel mode, the output voltage U of the on-load tap changing transformer is U1-U2/K, wherein K is 1,2, … …, N;
when the primary side of the voltage regulating transformer (T2) is suspended, the output voltage U of the on-load voltage regulating transformer is U1;
u1 is the secondary side voltage of the main transformer (T1), and U2 is the secondary side voltage corresponding to one tap of the regulating transformer (T2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921530729.4U CN210200527U (en) | 2019-09-16 | 2019-09-16 | On-load tap changing transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921530729.4U CN210200527U (en) | 2019-09-16 | 2019-09-16 | On-load tap changing transformer |
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| CN210200527U true CN210200527U (en) | 2020-03-27 |
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| CN201921530729.4U Expired - Fee Related CN210200527U (en) | 2019-09-16 | 2019-09-16 | On-load tap changing transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556242A (en) * | 2019-09-16 | 2019-12-10 | 泰州海田电气制造有限公司 | On-load tap changer and voltage regulation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556242A (en) * | 2019-09-16 | 2019-12-10 | 泰州海田电气制造有限公司 | On-load tap changer and voltage regulation method |
| CN110556242B (en) * | 2019-09-16 | 2024-04-12 | 泰州海田电气制造有限公司 | On-load voltage regulating transformer and voltage regulating method |
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Granted publication date: 20200327 Termination date: 20210916 |