CN219320410U - Transformer test system of variable frequency power supply - Google Patents
Transformer test system of variable frequency power supply Download PDFInfo
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- CN219320410U CN219320410U CN202320076602.XU CN202320076602U CN219320410U CN 219320410 U CN219320410 U CN 219320410U CN 202320076602 U CN202320076602 U CN 202320076602U CN 219320410 U CN219320410 U CN 219320410U
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Abstract
The utility model provides a transformer test system of a variable frequency power supply, which is characterized in that the voltage output by a power supply module is boosted or reduced by an output transformer so as to achieve the current required by the input transformer; and the secondary side of the output transformer is connected with the primary side of the input transformer, so that the input transformer and the output transformer can be tested at the same time, and the efficiency of testing the transformers is improved.
Description
Technical Field
The utility model relates to the field of transformers, in particular to a transformer test system of a variable frequency power supply.
Background
With the development and progress of industry and technology, the capacity of the variable frequency power supply based on the power electronic technology is larger and larger, and the requirements on the stability test of internal devices of the variable frequency power supply are higher and higher. At present, the input end and the output end of the existing high-capacity power supply are respectively provided with a transformer so as to realize the mode of changing the voltage from high voltage to low voltage to high voltage or the mode of changing the voltage from low voltage to high voltage to low voltage; however, with the increase of the power supply capacity, the importance of the internal transformer for current temperature rise test is increasingly remarkable, but the requirement on the capacity of a required matched test system is increasingly greater, and the realization difficulty is also increased.
When the temperature rise test of the transformer is carried out, the prior structure of the large-capacity power supply needs to separately test the input end transformer and the output end transformer, thereby causing low test efficiency.
Disclosure of Invention
In view of the above, the present utility model provides a transformer testing system for a variable frequency power supply, so that when a transformer is tested, two transformers can be tested at the same time, and the testing efficiency is improved.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the first aspect of the present utility model provides a transformer test system for a variable frequency power supply, the variable frequency power supply comprising: an input transformer, a power conversion module, and an output transformer; the transformer test system includes: a power module; wherein,,
the output end of the power supply module is connected with the primary side of the output transformer;
the secondary side of the output transformer is connected with the primary side of the input transformer;
and each secondary winding of the input transformer is in a short circuit state.
Optionally, the output voltage value of the power module is adjustable.
Optionally, the output voltage value of the power supply module includes a voltage value that makes the secondary side voltage of the output transformer be any one of the following voltages:
the voltage command value under the normal occurrence simulation working condition, the voltage command value under the harmonic occurrence simulation working condition, the voltage command value under the flicker occurrence simulation working condition, the voltage command value under the voltage abrupt change simulation working condition and the voltage command value under the voltage unbalance simulation working condition.
Optionally, the output current value of the power module is adjustable.
Optionally, the output current value of the power module includes a rated current of a primary side of the output transformer.
Optionally, the output current value of the power supply module includes a current value that makes the secondary side current of the output transformer be any one of the following currents:
the current command value under the normal occurrence simulation working condition, the current command value under the harmonic occurrence simulation working condition, the current command value under the flicker occurrence simulation working condition, the current command value under the current mutation simulation working condition and the current command value under the current unbalance simulation working condition.
Optionally, the output frequency value of the power module is adjustable.
Optionally, the output of the power module is three-phase alternating current.
Optionally, the method further comprises: a first temperature sensor and a second temperature sensor;
the first temperature sensor is arranged in a preset range of the input transformer;
the second temperature sensor is arranged in a preset range of the output transformer.
Optionally, the method further comprises: a first resistance measurement device and a second resistance measurement device;
the first resistance measuring device is used for measuring the winding resistance value of the input transformer;
the second resistance measuring device is used for measuring the winding resistance value of the output transformer.
According to the transformer test system of the variable frequency power supply, the output transformer is used for boosting or reducing the voltage output by the power supply module so as to achieve the current required by the input transformer; and the secondary side of the output transformer is connected with the primary side of the input transformer, so that the input transformer and the output transformer can be tested at the same time, and the efficiency of testing the transformers is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will briefly explain the embodiments or the drawings to be used in the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a variable frequency power supply according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a transformer testing system according to an embodiment of the present utility model;
fig. 3 and fig. 4 are schematic diagrams of two other structures of a transformer testing system according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The utility model provides a transformer test system of a variable frequency power supply, which can test two transformers simultaneously when the transformers are tested, and improves the test efficiency.
The variable frequency power supply is shown in fig. 1, and comprises: an input transformer T1, a power conversion module 01 and an output transformer T2; the primary side of the input transformer T1 is used for being connected with an input power supply, the secondary side of the input transformer T1 is connected with the primary side of the output transformer T2 through the power conversion module 01, and the secondary side of the output transformer T2 is used for being connected with a load.
In order to achieve simultaneous testing of the input transformer T1 and the output transformer T2, the transformer testing system provided in this embodiment includes the one shown in fig. 2: a power supply module 02; wherein:
as shown in fig. 2, the output end of the power module 02 is connected with the primary side of the output transformer T2; the secondary side of the output transformer T2 is connected with the primary side of the input transformer T1; each secondary winding of the input transformer T1 is in a shorted state.
In practical application, when the variable-frequency power supply is not connected with an input power supply and a load, the secondary side of the output transformer T2 is connected with the primary side of the input transformer T1, the windings of the secondary sides of the input transformer T1 are short-circuited, and the primary side of the output transformer T2 is connected with the output end of the power module 02; then, the control power module 02 outputs electric energy to the primary side of the output transformer T2, the output transformer T2 performs voltage conversion on the electric energy, and the secondary side of the electric energy is output to the primary side of the input transformer T1, so that the input transformer T1 also receives certain electric energy; and furthermore, the power module 02 can output electric energy, and simultaneously, the service life, temperature rise and other indexes of two transformers in the variable-frequency power supply can be tested.
In the transformer test system of the variable frequency power supply provided by the embodiment, the voltage output by the power supply module 02 is boosted or reduced through the output transformer T2 so as to achieve the current required by the input transformer T1; and the secondary side of the output transformer T2 is connected with the primary side of the input transformer T1, so that the input transformer T1 and the output transformer T2 can be tested at the same time, and the efficiency of transformer testing is improved.
On the basis of the above embodiment, in order to implement temperature rise test for two transformers, preferably, as shown in fig. 3, the transformer test system of the variable frequency power supply further includes: a first temperature sensor 03 and a second temperature sensor 04; the first temperature sensor 03 is disposed within a predetermined range of the input transformer T1, and the second temperature sensor 04 is disposed within a predetermined range of the output transformer T2.
In this case, when the temperature rise test of the transformer of the variable frequency power supply is performed, the current is output through the power module 02 until the current is stabilized at a certain preset current value, for example, after the rated current of the output transformer T2, the temperature of the input transformer T1 is tested through the first temperature sensor 03, and the temperature of the output transformer T2 is tested through the second temperature sensor 04, so that the temperature rise of the input transformer T1 and the temperature rise of the output transformer T2 can be determined.
That is, the temperature increases of the input transformer T1 and the output transformer T2 may be determined by monitoring the temperatures of the input transformer T1 and the output transformer T2 by the first temperature sensor 03 and the second temperature sensor 04, respectively.
Alternatively, in practical application, as shown in fig. 4, the transformer testing system of the variable frequency power supply further includes: a first resistance measuring device 05 and a second resistance measuring device 06; the first resistance measuring means 05 are for measuring the winding temperature of the input transformer T1 and the second resistance measuring means 06 are for measuring the winding temperature of the output transformer T2.
In this case, when the temperature rise test of the transformer of the variable frequency power supply is performed, the current is output through the power module 02 until the current is stabilized at a certain preset current value, for example, the rated current of the transformer T2 is output, and after a certain test period, the power module 02 is controlled to stop supplying power; at this time, the winding resistance of the input transformer T1 may be tested by the first resistance measuring device 05, and the winding resistance of the output transformer T2 may be tested by the second resistance measuring device 06 to determine the temperature rise of the input transformer T1 and the temperature rise of the output transformer T2, respectively.
That is, the resistance of the windings in the input transformer T1 may also be measured by the resistance measuring device 05, and the resistance of the windings in the output transformer T2 may be measured by the resistance measuring device 06, to calculate the temperature rise of the input transformer T1 and the output transformer T2.
The implementation manner of the temperature rise test is not limited herein, and depends on the specific application environment.
On the basis of the above embodiment, depending on the primary side of the output transformer T2, the output of the power module 02 may be three-phase ac; further, it is preferable that at least one of the output voltage value, the output current value, and the output frequency value of the power supply module 02 is adjustable.
In practical application, as the windings on the secondary sides of the input transformer T1 are short-circuited, the voltage applied by the power module 02 is not large, and the output voltage value is far smaller than the rated voltage on the primary side of the output transformer T2, but the value is not specifically limited and depends on the application environment; the output current value of the power module 02 includes the rated current of the primary side of the output transformer T2, for example, the output current value may be a value interval including the rated current; the output frequency value of the power module 02 may also be determined according to the specific application environment, and is not specifically limited herein. Two specific examples are provided below:
(1) Assuming that the rated capacity of the input transformer T1 is 10MVA, the rated voltage of the primary side is 35kV, the rated current of the primary side is 165A, and the secondary side is provided with 30 independent windings; the rated capacity of the output transformer T2 is 10MVA, the rated voltage of the primary side is 10kV, the rated current of the primary side is 577A, the rated voltage of the secondary side is 35kV, and the rated current of the secondary side is 165A; then:
according to the embodiment, the primary side of the input transformer T1 is connected with the secondary side of the output transformer T2, namely the 35kV sides of the input transformer T1 and the output transformer T2 are connected together, the secondary side of the input transformer T1 is short-circuited, meanwhile, the primary side of the output transformer T2 is connected with the power supply module 02, then the current value output by the power supply module 02 is controlled to be the rated current 577A of the output transformer T2, and then the temperature change of the input transformer T1 and the output transformer T2 is directly or indirectly measured, so that the temperature rise test of the input transformer T1 and the output transformer T2 can be simultaneously realized through one-time power supply output, and the test work efficiency is improved.
(2) Assuming that the rated capacity of the input transformer T1 is 10MVA, the rated voltage of the primary side is 690V, the rated current of the primary side is 8367A, and the secondary side is provided with 30 independent windings; the rated capacity of the output transformer T2 is 10MVA, the rated voltage of the primary side is 10kV, the rated current of the primary side is 577A, the rated voltage of the secondary side is 690V, and the rated current of the secondary side is 8367A; then:
according to the embodiment, the primary side of the input transformer T1 is connected with the secondary side of the output transformer T2, namely the primary side of the input transformer T1 is connected with the secondary side of the output transformer T2, the secondary side of the input transformer T1 is short-circuited, meanwhile, the primary side of the output transformer T2 is connected with the power supply module 02, then the current value output by the power supply module 02 is controlled to be the rated current 577A of the output transformer T2, and then the temperature change of the input transformer T1 and the output transformer T2 is directly or indirectly measured, so that the temperature rise test of the input transformer T1 and the output transformer T2 can be simultaneously realized through one-time power supply output, and the test work efficiency is improved.
Moreover, in the prior art, when the temperature rise test is performed on the input transformer T1 and the output transformer T2 separately, the rated current of 8367A needs to be supplied to the experimental equipment, which is difficult. In this embodiment, the secondary side of the output transformer T2 is connected with the primary side of the input transformer T1, and the primary side of the output transformer T2 is connected with the output end of the power module 02, so that the power module 02 can realize temperature rise test of the two transformers only by providing 577A rated current for the output transformer T2, thereby improving the test working efficiency, and the rated current 577A input at the 10kV side is far smaller than 8367A in the prior art, thereby greatly reducing the requirements on test facilities.
That is, the transformer test system provided by the embodiment not only can perform temperature rise tests of the input transformer and the output transformer at the same time, but also improves the efficiency of test work; moreover, when the rated voltage of the primary side of the input transformer T1 is lower, the purpose of testing can be achieved by using smaller current, and the requirement on testing facilities is reduced.
It should be noted that, by controlling the converters (A1 to An, B1 to Bn, and C1 to Cn) in the power conversion module 01 shown in fig. 1, the voltage and current output from the variable frequency power supply to the load can be adjusted, and the working conditions of normal occurrence, harmonic occurrence, voltage sudden rise and fall, three-phase imbalance, flicker and the like can be generally simulated. Therefore, in order to more truly embody the temperature rise, service life and other index changes of the two transformers under various working conditions, the embodiment provides different setting modes of the output electric parameters of the power module 02 based on the above embodiments, for example:
(1) The output voltage value of the power module 02 can be set, so that the secondary side voltage of the output transformer T2, that is, the voltage output to the load by the variable frequency power supply, is any one of the following:
the voltage command value under the normal occurrence simulation working condition, the voltage command value under the harmonic occurrence simulation working condition, the voltage command value under the flicker occurrence simulation working condition, the voltage command value under the voltage abrupt change simulation working condition and the voltage command value under the voltage unbalance simulation working condition.
(2) The output current value of the power supply module 02 may be set, so that the secondary side current of the output transformer T2, that is, the current output to the load by the variable frequency power supply, may be any one of the following:
the current command value under the normal occurrence simulation working condition, the current command value under the harmonic occurrence simulation working condition, the current command value under the flicker occurrence simulation working condition, the current command value under the current mutation simulation working condition and the current command value under the current unbalance simulation working condition.
When the output electrical parameters of the power module 02 are different, the temperature rise of the two transformers can be determined by the direct or indirect measurement method provided by the above embodiment, so that corresponding temperature rise tests are realized, and the description is omitted here.
The transformer test system of the variable frequency power supply can simulate various real working environments such as instantaneous voltage drop, unbalance, flickering and the like, and further can accurately obtain indexes such as temperature rise, service life and the like of two transformers.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present utility model.
The features described in the various embodiments of the present disclosure may be interchanged or combined with one another in the description of the disclosed embodiments to enable those skilled in the art to make or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A transformer test system for a variable frequency power supply, the variable frequency power supply comprising: an input transformer, a power conversion module, and an output transformer; the transformer test system includes: a power module; wherein,,
the output end of the power supply module is connected with the primary side of the output transformer;
the secondary side of the output transformer is connected with the primary side of the input transformer;
and each secondary winding of the input transformer is in a short circuit state.
2. The transformer testing system of a variable frequency power supply according to claim 1, wherein the output voltage value of the power supply module is adjustable.
3. The transformer test system of variable frequency power supply according to claim 2, wherein the output voltage value of the power supply module includes a voltage value that makes the secondary side voltage of the output transformer be any one of the following voltages:
the voltage command value under the normal occurrence simulation working condition, the voltage command value under the harmonic occurrence simulation working condition, the voltage command value under the flicker occurrence simulation working condition, the voltage command value under the voltage abrupt change simulation working condition and the voltage command value under the voltage unbalance simulation working condition.
4. The transformer testing system of a variable frequency power supply according to claim 1, wherein an output current value of the power supply module is adjustable.
5. The variable frequency power supply transformer test system of claim 4, wherein the output current value of the power supply module comprises a rated current of a primary side of the output transformer.
6. The transformer test system of variable frequency power supply according to claim 4, wherein the output current value of the power supply module includes a current value that makes the secondary side current of the output transformer be any one of the following currents:
the current command value under the normal occurrence simulation working condition, the current command value under the harmonic occurrence simulation working condition, the current command value under the flicker occurrence simulation working condition, the current command value under the current mutation simulation working condition and the current command value under the current unbalance simulation working condition.
7. The variable frequency power supply transformer test system of claim 1, wherein the output frequency value of the power supply module is adjustable.
8. The variable frequency power supply transformer test system of claim 1, wherein the output of the power supply module is three-phase alternating current.
9. The transformer testing system of a variable frequency power supply according to any one of claims 1 to 8, further comprising: a first temperature sensor and a second temperature sensor;
the first temperature sensor is arranged in a preset range of the input transformer;
the second temperature sensor is arranged in a preset range of the output transformer.
10. The transformer testing system of a variable frequency power supply according to any one of claims 1 to 8, further comprising: a first resistance measurement device and a second resistance measurement device;
the first resistance measuring device is used for measuring winding resistance of the input transformer;
the second resistance measuring device is used for measuring the winding resistance value of the output transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320076602.XU CN219320410U (en) | 2023-01-10 | 2023-01-10 | Transformer test system of variable frequency power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320076602.XU CN219320410U (en) | 2023-01-10 | 2023-01-10 | Transformer test system of variable frequency power supply |
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| CN219320410U true CN219320410U (en) | 2023-07-07 |
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| CN202320076602.XU Active CN219320410U (en) | 2023-01-10 | 2023-01-10 | Transformer test system of variable frequency power supply |
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