CN221100924U - Automatic test device for power capacitor aging test - Google Patents
Automatic test device for power capacitor aging test Download PDFInfo
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- CN221100924U CN221100924U CN202322859308.9U CN202322859308U CN221100924U CN 221100924 U CN221100924 U CN 221100924U CN 202322859308 U CN202322859308 U CN 202322859308U CN 221100924 U CN221100924 U CN 221100924U
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- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 239000003990 capacitor Substances 0.000 title claims abstract description 54
- 230000032683 aging Effects 0.000 title claims abstract description 19
- 230000005284 excitation Effects 0.000 claims description 7
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model relates to an automatic test device for a power capacitor aging test, which comprises a current transformer for detecting the input current of a power capacitor load loop, a voltage transformer for detecting the input voltage of the power capacitor load loop, a power analyzer for obtaining the load power factor and the phase relation based on the input current and the input voltage of the load loop, a controller for outputting a corresponding compensation control signal according to the advance or the retard of the phase between the input current and the input voltage, and an adjustable compensator for performing reactive compensation on the power capacitor based on the compensation control signal. The adjustable compensator comprises a plurality of constant value compensation branches and at least one adjustable compensation branch, wherein the constant value compensation branches comprise constant value reactors and constant value compensation switches which are connected in series, the adjustable compensation branches comprise adjustable reactors and adjustable compensation switches which are connected in series, and the constant value compensation branches and the adjustable compensation branches are connected in parallel at two ends of the power capacitor. The utility model can improve the test efficiency and the test precision.
Description
Technical Field
The utility model relates to the technical field of power equipment tests, in particular to an automatic test device for an aging test of a power capacitor.
Background
The main factors of capacitor aging are voltage and temperature, and the effect on voltage usually needs to be detected by a boost test (aging test). The general device for capacitor boosting test mainly comprises a transformer, a capacitor to be tested and a reactor. The reactor with switch is connected with the capacitor to construct a reactive compensation device, and when the reactive compensation device works, the capacitor and the inductive limit value exist to maintain a certain stable state. The reactive compensation device is a parallel structure device consisting of a high-voltage contact and a low-voltage contact, so that the switching of which magnitude reactors need to be switched is calculated and analyzed according to the actual input voltage value and capacitance value. For the structure that a plurality of reactors are connected in parallel, the value of the parallel reactor is certain, so that the equivalent inductance value after the parallel reactor has certain limitation, and when the input voltage slightly fluctuates, the reactor cannot accurately feed back the variation of the voltage in real time. In conclusion, the mode mainly depends on a test scheme of manual supervision and analysis, and the method has the advantages of long feedback period, low control precision, high monitoring cost, low efficiency and no contribution to popularization to large-area capacitor tests.
Disclosure of Invention
The utility model aims to provide an automatic test device for an aging test of a power capacitor, which has the advantages of good reactive compensation, high control precision and high efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
An automatic test device for a power capacitor aging test is used for performing the aging test on a power capacitor and comprises a current transformer for detecting the input current of a load loop of the power capacitor, a voltage transformer for detecting the input voltage of the load loop of the power capacitor, a power analyzer for obtaining the phase relation between a load power factor and the input current and the input voltage based on the input current and the input voltage of the load loop, a controller for outputting a corresponding compensation control signal according to the lead or lag of the phase between the input current and the input voltage obtained by the power analyzer, and an adjustable compensator for performing reactive compensation on the power capacitor based on the compensation control signal, wherein the current transformer, the voltage transformer and the controller are respectively connected with the power analyzer, and the adjustable compensator is connected with the controller.
The adjustable compensator comprises a plurality of constant value compensation branches and at least one adjustable compensation branch, wherein the constant value compensation branches comprise constant value reactors and constant value compensation switches which are connected in series, the adjustable compensation branches comprise adjustable reactors and adjustable compensation switches which are connected in series, the constant value compensation branches and the adjustable compensation branches are connected in parallel to two ends of the power capacitor, and the constant value compensation switches, the adjustable compensation switches and the adjustable reactors are all connected with the controller.
The automatic test device for the power capacitor aging test further comprises a voltage regulator and an excitation transformer, wherein the input side of the voltage regulator is connected with a power supply of the incoming line cabinet, the output side of the voltage regulator is connected with the input side of the excitation transformer, and the output side of the excitation transformer is connected with the power capacitor.
The voltage regulator is configured with an interactive interface to regulate its output voltage.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the reactive compensation method can realize better reactive compensation, improves test efficiency and test precision, reduces the power supply capacity required by the test, and is suitable for being popularized to large-area power capacitor tests.
Drawings
Fig. 1 is a schematic circuit diagram of an automatic test apparatus for a power capacitor burn-in test according to the present utility model.
Detailed Description
The utility model will be further described with reference to examples of embodiments shown in the drawings.
Embodiment one: as shown in figure 1, an automatic test device for performing power capacitor aging test on a power capacitor to be tested, namely a test object capacitor, comprises a current transformer TA, a voltage transformer TV, a power analyzer, a controller and an adjustable compensator. The current transformer TA is connected in series with the power capacitor and is used for detecting the input current of the load loop of the power capacitor. The voltage transformer TV is connected in parallel with the power capacitor and is used for detecting the input voltage of a load loop of the power capacitor. The power analyzer is connected with the current transformer TA and the voltage transformer TV respectively, so as to obtain the input current and the input voltage of the load loop of the power capacitor, and obtain the load power factor and the phase relation (lead or lag) between the input current and the input voltage based on the input current and the input voltage of the load loop. A controller (not shown) is connected to the power analyzer for obtaining a load power factor of the load loop and a phase relationship between the input current and the input voltage, and outputting a corresponding compensation control signal according to a lead or a lag of the phase between the input current and the input voltage obtained by the power analyzer. The adjustable compensator is connected with the controller, and performs reactive compensation on the power capacitor based on the compensation control signal.
The adjustable compensator comprises a plurality of constant value compensation branches and at least one adjustable compensation branch. The constant value compensation branch circuit comprises a constant value reactor and a constant value compensation switch which are connected in series. The adjustable compensation branch circuit comprises an adjustable reactor and an adjustable compensation switch which are connected in series. The fixed value compensation branch and the adjustable compensation branch are connected in parallel with two ends of the power capacitor, and the fixed value compensation switch, the adjustable compensation switch and the adjustable reactor are connected with the controller.
In addition, the automatic test device for the power capacitor aging test further comprises a voltage regulator and an excitation transformer. The input side of the voltage regulator is connected with the power supply of the incoming line cabinet, the output side of the voltage regulator is connected with the input side of the exciting transformer, and the output side of the exciting transformer is connected with the power capacitor. The voltage regulator is configured with an interactive interface that regulates its output voltage.
The automatic test device can automatically realize high-precision reactive compensation in the aging test of the power capacitor, so that the capacity of the voltage regulator and the exciting transformer for the test can be reduced. Firstly presetting a compensation inductance value according to parameters of a sample capacitor, controlling the switching state of corresponding switches of each inductor at the back by combining the capacity of the sample capacitor, wherein the sample parameter is a nameplate parameter and has a certain error with the actual capacitance value, so that the compensation inductance set according to the nameplate parameter cannot balance reactive power, judging whether a load is inductive or capacitive according to the lead or lag of the phase between input current and input voltage measured by a power analyzer so as to judge whether the inductance is over-compensated or under-compensated, and adjusting an adjustable reactor to ensure that the load is inductive or capacitiveI.e./>And the reactive power balance is realized, and better compensation is realized.
The compensation principle is as follows: the alternating current 380V voltage is input by utilizing the incoming line cabinet, the voltage is regulated by the voltage regulator, the voltage regulator can realize 0-420V regulation, thus the boosted input voltage value is changed, the voltage transformer and the current transformer monitor the secondary side voltage and current of the transformer respectively, the active, reactive power and power factor of the load are measured by the power analyzer, the following inductance compensation is judged to be over-compensation or under-compensation by the phase relation between the input current and the input voltage measured by the power analyzer, and then the adjustable reactor is controlled, so that the modified compensation is realized. Thus, the front power supply, the voltage regulator and the exciting transformer do not need to give reactive power, and the rear load is all active, so that the supply capacity value needed to be provided by the front stage is reduced.
The process for carrying out the aging test on the power capacitor by using the automatic test device comprises the following steps:
The first step: the system input and output power supply is correctly connected; the system ground wire is correctly connected, so that the reliability of the ground wire is ensured; the control lines and the measuring lines of the system are correctly connected; checking the connection conditions among sites, equipment and systems, and eliminating potential safety hazards possibly existing;
And a second step of: checking and correctly connecting a power line and a serial port communication line of a man-machine interaction interface;
And a third step of: opening a total air switch below the rear side of the control cabinet to enable the control cabinet to be electrified; then turning a power switch on a control panel of the control cabinet;
Fourth step: if the system directly enters the test interface, no communication error prompt exists, and the whole system is normal; if the communication error is indicated, indicating that the system software control system is connected in error, checking wiring after the power supply is turned off, and restarting the power-on;
Fifth step: and inputting rated voltage of a sample capacitor used for the test, setting test voltage required by the test, and performing the test after the set time. If the test high-voltage measurement voltage divider is changed, setting parameters are required to be selected at a parameter setting interface;
Sixth step: clicking a closing button of a control console, clicking an automatic withstand voltage button, starting automatic boosting by a system, stopping boosting after the high voltage of the system reaches a test voltage, starting withstand voltage timing, prompting "withstand voltage in progress", starting automatic depressurization after five seconds when prompting "withstand voltage time arrives", stopping depressurization after five seconds, and finishing the withstand voltage test;
Seventh step: and after the test is finished, clicking a brake separating button. The power supply of the control desk is turned off by rotating the power switch key. A multimeter is used to ensure that the removed components are not powered when the input and output power cords are removed.
The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.
Claims (4)
1. An automatic test device for power capacitor ageing tests for carry out ageing tests to power capacitor, its characterized in that: the automatic test device for the power capacitor aging test comprises a current transformer for detecting the input current of a power capacitor load loop, a voltage transformer for detecting the input voltage of the power capacitor load loop, a power analyzer for obtaining the phase relation between a load power factor and the input current and the input voltage based on the input current and the input voltage of the load loop, a controller for outputting a corresponding compensation control signal according to the lead or the lag of the phase between the input current and the input voltage obtained by the power analyzer, and an adjustable compensator for performing reactive compensation on the power capacitor based on the compensation control signal, wherein the current transformer, the voltage transformer and the controller are respectively connected with the power analyzer, and the adjustable compensator is connected with the controller.
2. The automated test equipment for power capacitor burn-in of claim 1, wherein: the adjustable compensator comprises a plurality of constant value compensation branches and at least one adjustable compensation branch, wherein the constant value compensation branches comprise constant value reactors and constant value compensation switches which are connected in series, the adjustable compensation branches comprise adjustable reactors and adjustable compensation switches which are connected in series, the constant value compensation branches and the adjustable compensation branches are connected in parallel to two ends of the power capacitor, and the constant value compensation switches, the adjustable compensation switches and the adjustable reactors are all connected with the controller.
3. The automated test equipment for the aging test of a power capacitor according to claim 1 or 2, wherein: the automatic test device for the power capacitor aging test further comprises a voltage regulator and an excitation transformer, wherein the input side of the voltage regulator is connected with a power supply of the incoming line cabinet, the output side of the voltage regulator is connected with the input side of the excitation transformer, and the output side of the excitation transformer is connected with the power capacitor.
4. An automated test apparatus for power capacitor burn-in according to claim 3, wherein: the voltage regulator is configured with an interactive interface to regulate its output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322859308.9U CN221100924U (en) | 2023-10-25 | 2023-10-25 | Automatic test device for power capacitor aging test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322859308.9U CN221100924U (en) | 2023-10-25 | 2023-10-25 | Automatic test device for power capacitor aging test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221100924U true CN221100924U (en) | 2024-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322859308.9U Active CN221100924U (en) | 2023-10-25 | 2023-10-25 | Automatic test device for power capacitor aging test |
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| Country | Link |
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| CN (1) | CN221100924U (en) |
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2023
- 2023-10-25 CN CN202322859308.9U patent/CN221100924U/en active Active
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