CN216646657U - No-load and load test system of low-frequency transformer - Google Patents
No-load and load test system of low-frequency transformer Download PDFInfo
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- CN216646657U CN216646657U CN202122323126.0U CN202122323126U CN216646657U CN 216646657 U CN216646657 U CN 216646657U CN 202122323126 U CN202122323126 U CN 202122323126U CN 216646657 U CN216646657 U CN 216646657U
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Abstract
The utility model relates to a no-load and load test system of a low-frequency transformer, wherein the connection structure of the no-load test system is as follows: the inlet side of the variable frequency power supply is connected with a 380V power supply, the outlet side of the variable frequency power supply is connected with the low-voltage side of the intermediate transformer, the high-voltage side of the intermediate transformer provides a no-load test power supply for the corresponding low-frequency transformer to be tested, and the high-voltage side of the intermediate transformer is connected with a power analyzer. The connection structure of the load test system is as follows: the inlet side of the variable frequency power supply is connected with a 380V power supply, the outlet side of the variable frequency power supply is connected with the low-voltage side of the intermediate transformer, the high-voltage side of the intermediate transformer provides a load test power supply for the corresponding low-frequency transformer to be tested, the capacitor bank is connected in parallel with the outlet side of the intermediate transformer, the high-voltage side of the intermediate transformer is connected with the power analyzer, and the power analyzer is integrated with a voltage transformer PT and a current transformer CT. The utility model collects the current and voltage signals of the test system and realizes the no-load and load tests of the low-frequency transformer by matching with the power analyzer.
Description
Technical Field
The utility model belongs to the technical field of transformer tests, and particularly relates to a no-load and load test system suitable for a low-frequency transformer.
Background
With the rapid development of power grid technology and power electronic technology, high-power technology capable of flexibly converting frequency is gradually mature, and frequency division transmission technology is developed. The principle of the method is that the frequency of a power transmission system is reduced, and the impedance of a line is obviously reduced, so that the line static stability limit is improved, and the voltage fluctuation is reduced; the charging reactive power of the cable is reduced, the active transmission capability of the cable is released, and the cable has the characteristic of convenience in networking of an alternating current transmission system. The low-frequency system relates to a main device, namely a low-frequency boosting transformer, a collecting boosting transformer and a fan boosting transformer. The influence of frequency reduction on the transformer design is mainly concentrated on the volume of an iron core, the transformer type test under low frequency is adopted, and the conventional low-voltage test part can adopt the existing equipment for testing; the insulation test part of the lightning impulse test is mainly microsecond insulation examination in a high-frequency state, and the existing equipment, method and standard can be used.
In the no-load test, the loss test of the low-frequency transformer under 20 HZ-50 HZ is realized, no formula for frequency conversion is used for reference, and the existing frequency conversion is only limited to be suitable for the condition that two frequencies are close to each other, so the test result under 20 HZ-50 HZ cannot be compared under the power frequency state; the loss test of the low-frequency transformer in the load test does not have a frequency conversion empirical formula, so that the low-frequency transformer air load test needs to consider the low-frequency test device comprehensively.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a no-load and load test system of a low-frequency transformer. The technical scheme adopted by the utility model is as follows:
an empty-load and load test system of a low frequency transformer, comprising: the device comprises a variable frequency power supply, a power analyzer, an intermediate transformer and a capacitor bank. The connecting structure of the no-load test system of the low-frequency transformer is as follows: the inlet side of the variable frequency power supply is connected with a 380V power supply, the outlet side of the variable frequency power supply is connected with the low-voltage side of the intermediate transformer, the high-voltage side of the intermediate transformer provides a no-load test power supply for the corresponding low-frequency transformer to be tested, the high-voltage side of the intermediate transformer is connected with a power analyzer, and the power analyzer is integrated with a voltage transformer PT and a current transformer CT; the connection structure of the load test system of the low-frequency transformer is as follows: the inlet side of the variable frequency power supply is connected with a 380V power supply, the outlet side of the variable frequency power supply is connected with the low-voltage side of the intermediate transformer, the high-voltage side of the intermediate transformer provides a load test power supply for the corresponding low-frequency transformer to be tested, the capacitor bank is connected in parallel with the outlet side of the intermediate transformer, the high-voltage side of the intermediate transformer is connected with the power analyzer, and the power analyzer is integrated with a voltage transformer PT and a current transformer CT.
The utility model has the beneficial effects that:
according to the no-load and load test system of the low-frequency transformer, the no-load and load test conditions of the low-frequency transformer are realized by the variable frequency power supply through the intermediate transformer, the current transformer part in the power analyzer uses the flux gate current transformer CT and the voltage transformer PT which can normally work in the low-frequency state, current and voltage signals of the test system are collected, and the power analyzer is matched to complete the no-load test of the low-frequency transformer in the low-frequency state. The test system is simple in structure and convenient to connect, the low-frequency test device and the connection thereof are considered comprehensively, and no-load and load tests of the low-frequency transformer are realized.
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 should be apparent that the drawings in the following description are specific embodiments of the utility model, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a no-load test system for a low frequency transformer in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a load testing system for a low frequency transformer in accordance with an embodiment of the present invention;
in the figure, 1-variable frequency power supply, 2-power analyzer, 3-intermediate transformer, 4-low frequency transformer, 5-capacitor bank.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
An empty-load and load test system of a low frequency transformer, comprising: the device comprises a variable frequency power supply 1, a power analyzer 2, an intermediate transformer 3 and a capacitor bank 5.
Fig. 1 is a schematic diagram of a no-load test system of a low-frequency transformer according to an embodiment of the present invention. The connecting structure of the no-load test system of the low-frequency transformer is as follows: the inlet side of a variable frequency power supply 1 is connected with a 380V power supply, the outlet side of the variable frequency power supply 1 is connected with the low-voltage side of an intermediate transformer 3, the high-voltage side of the intermediate transformer 3 provides a no-load test power supply for a corresponding low-frequency transformer 4 to be tested, the high-voltage side of the intermediate transformer 3 is connected with a power analyzer 2, the power analyzer 2 is integrated with a voltage transformer PT and a current transformer CT, the voltage transformer PT is used for measuring low-frequency voltage U, the current transformer CT is used for measuring low-frequency current I, and the power analyzer 2 can measure the measured voltage U, the measured current I and a power factor angle psi through a formula PActive power＝U*I*cosΨ，PReactive powerAnd (7) measuring the no-load loss of the test product finally. Since the iron core of the intermediate transformer 3 is more easily in a saturated state in a low frequency state, the high voltage rated voltage and rated frequency of the intermediate transformer 3 and the low voltage rated voltage and rated frequency of the low frequency transformer 4 to be tested generally need to be satisfied withThe relationship is as follows: ur1/H1>Ur2/H2, where Ur1 is the high voltage rating of the intermediate transformer 3, H1 is the rated frequency of the intermediate transformer 3, Ur2 is the low voltage rating of the low frequency transformer 4 of the test article, and H2 is the rated frequency of the low frequency transformer 4 of the test article. The connecting structure of the no-load test system can be generally suitable for the no-load test of the low-frequency transformer 4 with the rated frequency of 20 HZ-50 HZ by selecting the intermediate transformers 3 with different capacities.
Fig. 2 is a schematic diagram of a load testing system of a low-frequency transformer according to an embodiment of the present invention. The connection structure of the load test system of the low-frequency transformer is as follows: the entrance side of the variable frequency power supply 1 is connected with a 380V power supply, the exit side of the variable frequency power supply 1 is connected with the low-voltage side of the intermediate transformer 3, the high-voltage side of the intermediate transformer 3 provides a load test power supply for the corresponding low-frequency transformer 4 to be tested, the capacitor bank 5 is connected in parallel with the exit side of the intermediate transformer 3, the high-voltage side of the intermediate transformer 3 is connected with the power analyzer 2, the power analyzer 2 is integrated with a voltage transformer PT and a current transformer CT, the voltage transformer PT is used for measuring low-frequency voltage U, and the current transformer CT is used for measuring low-frequency current I. The power analyzer 2 can measure the voltage U, the current I and the power factor angle psi through the formula PActive power＝U*I*cosΨ，PReactive powerAnd (4) measuring the load loss of the test product finally. Considering the limited capacity of the high-power variable frequency power supply, the capacitor bank 5 is connected in parallel to the outlet side (i.e. the sample pressurizing side) of the intermediate transformer 3, and the output current of the load test variable frequency power supply is reduced by compensating the current through the capacitor. The connection structure of the load test system is generally suitable for the load test of a low-frequency transformer 4 with rated frequency of 20 HZ-50 HZ by selecting intermediate transformers 3 with different capacities.
The load loss of the transformer is considered to be composed of two major parts, one is the direct current resistance loss P of the coilDirect resistanceThe value of which is related to the current I and the resistance R by PDirect resistance＝I2R, the loss of this part is independent of the frequency of the power supply, the other part can be called additional loss, when the ratio of the additional loss of the transformer to the total loss is not very large, by comparing the loss data of different frequencies, the following empirical formula is provided, P1/Pn (f1/fn)2In the formula, P1 represents an additional loss at the power supply frequency f1, and Pn represents an additional loss at the power supply frequency fn.
In the embodiment of the utility model, the variable frequency power supply 1 is formed by connecting two 450kW variable frequency power supply products in parallel, and provides power supply support for system tests.
In the embodiment of the present invention, the transformer part in the power analyzer 2 uses a fluxgate current transformer CT and a fluxgate voltage transformer PT that can normally operate in a low frequency state.
Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are used to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (4)
1. A no-load and load test system of a low-frequency transformer is characterized by comprising: the device comprises a variable frequency power supply (1), a power analyzer (2), an intermediate transformer (3) and a capacitor bank (5);
the connecting structure of the no-load test system is as follows: the inlet side of the variable frequency power supply (1) is connected with a 380V power supply, the outlet side of the variable frequency power supply (1) is connected with the low-voltage side of the intermediate transformer (3), the high-voltage side of the intermediate transformer (3) provides a no-load test power supply for the corresponding low-frequency transformer (4) to be tested, and the high-voltage side of the intermediate transformer (3) is connected with the power analyzer (2);
the connection structure of the load test system is as follows: the inlet side of a variable frequency power supply (1) is connected with a 380V power supply, the outlet side of the variable frequency power supply (1) is connected with the low-voltage side of an intermediate transformer (3), the high-voltage side of the intermediate transformer (3) provides a load test power supply for a corresponding low-frequency transformer (4) to be tested, a capacitor bank (5) is connected in parallel with the outlet side of the intermediate transformer (3), and the high-voltage side of the intermediate transformer (3) is connected with a power analyzer (2);
the power analyzer (2) is integrated with a voltage transformer PT and a current transformer CT.
2. The no-load and load test system of the low-frequency transformer as claimed in claim 1, characterized in that said variable frequency power supply (1) is composed of two 450kW variable frequency power supply products connected in parallel.
3. The no-load and load test system of the low frequency transformer according to claim 1, characterized in that the transformer part of the power analyzer (2) uses fluxgate current transformer CT and fluxgate voltage transformer PT.
4. The no-load and load test system of the low-frequency transformer as claimed in claim 1, wherein the high-voltage rated voltage and rated frequency of the intermediate transformer (3) and the low-voltage rated voltage and rated frequency of the low-frequency transformer (4) to be tested satisfy the following relations: ur1/H1> Ur2/H2, wherein Ur1 is the high-voltage rated voltage of the intermediate transformer (3), H1 is the rated frequency of the intermediate transformer (3), Ur2 is the low-voltage rated voltage of the low-frequency transformer (4) of the tested product, and H2 is the rated frequency of the low-frequency transformer (4) of the tested product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122323126.0U CN216646657U (en) | 2021-09-24 | 2021-09-24 | No-load and load test system of low-frequency transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122323126.0U CN216646657U (en) | 2021-09-24 | 2021-09-24 | No-load and load test system of low-frequency transformer |
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| CN216646657U true CN216646657U (en) | 2022-05-31 |
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| CN202122323126.0U Active CN216646657U (en) | 2021-09-24 | 2021-09-24 | No-load and load test system of low-frequency transformer |
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