CN112731084A - Transformer testing device and testing method - Google Patents
Transformer testing device and testing method Download PDFInfo
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- CN112731084A CN112731084A CN202011578625.8A CN202011578625A CN112731084A CN 112731084 A CN112731084 A CN 112731084A CN 202011578625 A CN202011578625 A CN 202011578625A CN 112731084 A CN112731084 A CN 112731084A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The embodiment of the application provides a transformer testing device and a testing method, wherein the testing device comprises: the high voltage generating unit is connected with the input end of the transformer, so that the transformer can generate the required high voltage; the high-voltage testing unit is connected with the output end of the transformer and is used for measuring a high-voltage signal actually generated by the transformer; and the processing module is connected with the high-voltage testing unit, receives the high-voltage signal transmitted by the high-voltage testing unit and performs data processing to judge whether the transformer is qualified. The transformer testing device provided by the embodiment of the application enables the transformer to work to generate high voltage by exciting the transformer, tests the high voltage generated during the actual working of the transformer, and judges whether the transformer is qualified according to the measured high voltage value, so that the accuracy of a detection result is improved.
Description
Technical Field
The application relates to the technical field of transformer detection, in particular to a transformer testing device and a testing method.
Background
In practical use, the transformer needs to withstand extremely high voltage. The existing transformer withstand voltage tester outputs high voltage through the tester, and adds alternating current high voltage or direct current high voltage between primary pins, between secondary pins and between the primary pin and the secondary pin of the transformer so as to carry out withstand voltage test on the transformer.
Disclosure of Invention
In view of this, the embodiment of the present application provides a transformer testing apparatus and a testing method, so as to solve the following problems in the prior art: in the transformer test, the transformer does not work, so that the high voltage generated when the transformer works in an actual use scene cannot be simulated and detected.
On the one hand, this application embodiment provides a transformer testing arrangement, includes:
the high voltage generating unit is connected with the input end of the transformer, so that the transformer can generate the required high voltage;
the high-voltage testing unit is connected with the output end of the transformer and is used for measuring a high-voltage signal actually generated by the transformer;
and the processing module is connected with the high-voltage testing unit, receives the high-voltage signal transmitted by the high-voltage testing unit and performs data processing to judge whether the transformer is qualified.
In some embodiments, the high voltage generation unit includes a dc power supply unit and a switching tube control circuit, an input end of the switching tube control circuit is connected to an output end of the dc power supply unit;
and the output end of the switching tube control circuit is connected with the input end of the transformer.
In some embodiments, the transformer testing apparatus further comprises a sound capturing unit for collecting a sound signal emitted when the transformer generates a high voltage;
and the processing module receives the sound signal and processes the sound signal so as to judge whether the transformer is qualified.
In some embodiments, the processing module includes a data analysis unit, configured to process the sound signal to perform frequency domain conversion, perform analysis based on a spectral characteristic of howling, and determine whether the sound signal is a howling signal.
In some embodiments, the processing module further includes a result determination unit, and the result determination unit determines the high-voltage signal or the howling signal based on a preset standard value of a qualified product to determine whether the transformer is qualified.
On the other hand, the embodiment of the present application further provides a transformer testing method, including:
acquiring a high-voltage signal, wherein the high-voltage signal is a high-voltage signal which is actually generated by the transformer and is acquired by a high-voltage testing unit, and the high voltage of the transformer is generated by exciting the transformer by a high-voltage generating unit;
and processing the high-voltage signal to judge whether the transformer is qualified.
In some embodiments, the exciting the transformer by the high voltage generating unit to generate the high voltage includes:
the direct current power supply unit is controlled by the switching tube control circuit to generate a high pulse electric signal, and the high pulse electric signal is connected into the transformer and then excites the transformer to generate high voltage.
In some embodiments, the transformer testing method further comprises:
acquiring a sound signal, wherein the sound signal is a signal of sound emitted when the transformer generates high voltage and is acquired by a sound capturing unit;
and processing the sound signal to judge whether the transformer is qualified.
In some embodiments, the processing the sound signal to determine whether the transformer is qualified includes:
and carrying out spectrum analysis on the sound signal, and determining whether the sound signal is a howling signal or not based on the spectral characteristics of the howling.
In some embodiments, determining whether the transformer is qualified comprises:
and judging the high-voltage signal or the squeal signal based on a preset standard value of a qualified product, so as to judge whether the transformer is qualified.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the transformer testing device of the embodiment of the application is simple in structure and convenient to use, and can be used for exciting the transformer to enable the transformer to work to generate high voltage so as to test the high voltage generated during the actual working of the transformer, and judging whether the transformer is qualified according to the measured high voltage value, so that the accuracy of a detection result is improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a transformer testing apparatus according to a first embodiment of the present application;
fig. 2 is a flowchart of a transformer testing method according to a second embodiment of the present application.
Description of reference numerals:
100-a high voltage generating unit; 200-a high voltage test unit; 300-a processing module; 310-a data analysis unit; 320-a result determination unit; 400-a sound capture unit; 410-microphone.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Detailed descriptions of known functions and known components are omitted in the present application in order to keep the following description of the embodiments of the present application clear and concise.
In the prior art, a voltage withstanding tester is generally used to perform a voltage withstanding test on a transformer, for example, the voltage withstanding tester outputs a high voltage to perform the voltage withstanding test on the transformer in a manner of adding an ac high voltage or a dc high voltage between primary pins, between secondary pins, and between the primary pin and the secondary pin of the transformer, so as to detect whether the transformer is qualified. The inventor finds that during the process of testing the transformer by the withstand voltage tester, the transformer does not form specific current, so that the working condition of the transformer in actual use cannot be simulated, and whether the transformer can output required high voltage in actual operation cannot be detected.
The embodiment of the application provides a transformer testing arrangement, as shown in fig. 1, transformer testing arrangement includes: the high voltage generating unit 100 is connected with an input end of the transformer, and based on the high voltage required to be generated by the preset transformer, the high voltage generating unit 100 generates a primary excitation to the transformer by generating a high voltage pulse signal with a corresponding frequency, so that a secondary output end of the transformer outputs a corresponding high voltage according to the coil turn ratio of the transformer; the high-voltage testing unit 200 is connected with the output end of the transformer, and measures a high-voltage signal generated by the transformer in actual work when the transformer is excited to generate high voltage, in specific implementation, a resistor with a larger resistance value is firstly adopted at the output end of the transformer to divide voltage, differential amplification is carried out on the divided tiny voltage according to needs, the amplified voltage is filtered and then output, ADC (analog to digital converter) acquisition is carried out to obtain a voltage signal, and the high-voltage signal generated by the transformer in actual work can be obtained through calculation according to the voltage signal; the processing module 300 is connected with the high-voltage testing unit 200, receives the high-voltage signal transmitted by the high-voltage testing unit 200 after the high-voltage testing unit 200 measures the high-voltage signal generated in the actual operation of the transformer, performs data processing, calculates a voltage value represented by the high-voltage signal, compares the voltage value based on the preset high-voltage value required to be generated, and judges whether the transformer is qualified or not according to the difference between the two voltage values; of course, the high voltage value output by the qualified transformer under the high voltage pulse signal with the corresponding frequency may be compared, and whether the transformer is qualified or not may be determined according to the difference between the two values.
The transformer testing device of the embodiment of the application is simple in structure and convenient to use, and can be used for exciting the transformer to enable the transformer to work to generate high voltage so as to test the high voltage generated during the actual working of the transformer, and judging whether the transformer is qualified according to the measured high voltage value, so that the accuracy of a detection result is improved.
In specific implementation, for exemplary illustration, it can be understood that the transformer testing device of the present application includes a transformer testing seat for placing a transformer, and the transformer testing device is connected to a pin of the transformer on the transformer testing seat, so as to communicate with the transformer. Specifically, the high voltage generating unit 100 may include a power supply unit to provide a required current or voltage, and a switching tube control circuit communicated with the power supply unit, wherein after the high voltage generating unit 100 is connected to the input end of the transformer through the transformer test socket, the switching tube control circuit controls the high voltage generating unit to provide a high voltage pulse signal with a frequency corresponding to the required voltage at the input end of the transformer, so as to generate a primary excitation to the transformer.
In some embodiments, the high voltage generating unit 100 includes a dc power supply unit (not shown) for providing a dc voltage or a dc current, and a switching tube control circuit (not shown) connected to the dc power supply unit, wherein an input terminal of the switching tube control circuit is connected to an output terminal of the dc power supply unit; and the output end of the switching tube control circuit is connected with the input end of the transformer. Therefore, the direct current power supply unit is controlled by the switching tube control circuit to provide voltage or current which changes according to corresponding frequency for the input end of the transformer, and therefore the secondary output end of the transformer is excited to output corresponding high voltage.
The inventor of the application finds that in actual work of the transformer, for example, when the transformer is applied to an anion generator, under the condition that a high voltage of-9 KV needs to be output, the transformer generates howling during work, and therefore whether the transformer is qualified or not can be represented by the howling amount generated when the transformer outputs the high voltage. In order to measure the data representing the amount of howling generated by the transformer, in some embodiments of the present application, the transformer testing apparatus further includes a sound capturing unit 400 for collecting a sound signal emitted when the transformer generates a high voltage in actual operation; in specific implementation, the transformer testing apparatus may be provided with a microphone 410, the microphone 410 is connected to the processing module 300 through a sound collecting circuit, and the microphone 410 is configured to collect sound emitted when the transformer generates high voltage in actual operation in real time, amplify and collect a current signal corresponding to the collected sound through the sound collecting circuit, obtain the sound signal, and transmit the sound signal to the processing module 300; the processing module 300 receives the sound signal for processing, for example, the sound signal may be compared with a sound signal of a qualified transformer in actual operation, so as to determine whether the transformer is qualified.
Specifically, howling signals sent out by the qualified transformer under the corresponding high voltage generated in the actual work can be obtained in advance, frequency domain conversion is carried out, and the frequency spectrum of the howling sent out by the qualified transformer under the high voltage generated is obtained and stored. The processing module 300 includes a data analysis unit 310, and when the processing module 300 acquires the sound signal of the tested transformer, the data analysis unit 310 processes the sound signal to perform frequency domain conversion, acquire a frequency spectrum of the sound signal of the tested transformer, and perform analysis based on howling spectrum characteristics, such as a magnitude at each frequency and a phase at each frequency, to determine whether the sound signal is a howling signal.
In some embodiments, the processing module 300 further includes a result determining unit 320, and the result determining unit 320 determines the high voltage signal or the howling signal based on a preset standard value of a qualified product to determine whether the transformer is qualified. Specifically, based on the voltage value generated by the preset qualified product under the action of the same high-voltage pulse electrical signal, the result determining unit 320 compares the voltage value with the high-voltage value represented by the high-voltage signal generated by the tested transformer, if the same or different is within an error allowable range, the tested transformer is determined to be a qualified product, and if the difference is too large and not within the error allowable range, the generated transformer is determined to be a non-qualified product. In addition, the result determining unit 320 may compare the frequency spectrum corresponding to the sound signal generated by the tested transformer with a frequency spectrum corresponding to a sound signal generated by the preset qualified product under the action of the same high-voltage pulse electrical signal, and determine that the tested transformer is a qualified product if the magnitudes or phases of the frequencies are the same or different within a range allowed by a spectral feature, or determine that the generated transformer is a failed product if the magnitude or phase difference of the frequencies exceeds the range allowed by the spectral feature.
In the device and the method for carrying out the voltage withstand test of the transformer in the prior art, the transformer is a receiver and does not participate in the work. Although the application also depends on outputting high voltage to carry out testing, the transformer participates in work and belongs to an output party. The device simulates the use condition of the whole working scene by adding the excitation signal to the primary side of the transformer, and judges the squeal condition of the transformer by sound data analysis. As transformer parameter testing arrangement, the device of this application can exist as transformer auxiliary test device, has compensatied transformer comprehensive tester and withstand voltage tester's not enough, also can regard as transformer to screen instrument in batches simultaneously, is a low cost, high efficiency testing arrangement.
Based on the same inventive concept of the transformer testing apparatus, the embodiment of the present application further provides a transformer testing method, as shown in fig. 2, including the following steps:
s1, acquiring a high voltage signal, wherein the high voltage signal is a signal of a high voltage actually generated by the transformer collected by the high voltage testing unit 200, and the high voltage of the transformer is generated by the high voltage generating unit 100 exciting the transformer.
In the embodiments of the testing method of the present application, the testing method can be implemented by transformer testing components, devices, and apparatuses available to those skilled in the art, and can also be implemented by combining the testing devices, components, and units mentioned above and below.
In a specific embodiment, in this step, according to a high voltage value expected to be tested, a corresponding excitation signal is generated by the high voltage generation unit 100 and provided to an input terminal of the transformer, so as to excite the transformer, so that a secondary output terminal of the transformer generates a high voltage, and then a signal of the high voltage actually generated at the output terminal of the transformer is acquired by the high voltage test unit 200, so as to obtain a high voltage signal.
And S2, processing the high-voltage signal to judge whether the transformer is qualified.
Processing the obtained high-voltage signal, calculating a high-voltage value represented by the high-voltage signal, comparing the high-voltage value based on the high-voltage value to be tested, and judging whether the transformer is qualified or not according to the difference between the high-voltage value and the high-voltage value; the high voltage value generated by qualified transformer under the excitation signal can be compared, so as to judge whether the transformer is qualified according to the difference between the high voltage value and the high voltage value.
According to the test method, the execution main body can be understood as a processing device, a processing module and a processing unit which are used for receiving the measured high-voltage signal actually generated by the transformer and processing the high-voltage signal to judge whether the transformer is qualified or not, and further preferably processing the high-voltage signal through receiving the sound signal emitted when the transformer generates high voltage to judge whether the transformer is qualified or not.
In some embodiments, the exciting the transformer by the high voltage generating unit 100 to generate the high voltage includes: the direct current power supply unit is controlled by the switching tube control circuit to generate a high pulse electric signal, and the high pulse electric signal is connected into the transformer and then excites the transformer to generate high voltage. In this embodiment, the dc power supply unit is connected to the input terminal of the transformer through the switching tube control circuit, so that the dc power supply unit can be controlled by the switching tube control circuit to provide a voltage or a current varying according to a corresponding frequency to the input terminal of the transformer, thereby exciting the secondary output terminal of the transformer to output a corresponding high voltage.
In some embodiments, the transformer testing method further obtains a sound signal, wherein the sound signal is a signal obtained by collecting a sound emitted when the transformer generates a high voltage by using a sound capture unit 400; and processing the sound signal to judge whether the transformer is qualified. The method for acquiring the sound signal and determining in this embodiment has been described in the above embodiments, and is not described herein again.
In some embodiments, the processing the sound signal to determine whether the transformer is qualified includes:
and carrying out spectrum analysis on the sound signal, and determining whether the sound signal is a howling signal or not based on the spectral characteristics of the howling.
In some embodiments, determining whether the transformer is qualified comprises:
and judging the high-voltage signal or the squeal signal based on a preset standard value of a qualified product, so as to judge whether the transformer is qualified.
The test apparatus and method of the present application are further described below, by way of example.
In a factory detection scene, a transformer with a transformer turn ratio of 5:1400 is tested to work in a working scene of-9 KV, the transformer is placed in a transformer test seat, the elastic sheet is pressed to enable pins of the transformer to be in full contact with the elastic sheet, after the test is started, the high-voltage generator unit enables the switch tube to work at a specified working frequency capable of outputting-9 KV, the high-voltage test unit simultaneously monitors output voltage, the sound capture unit captures and records the sound of howling, and high-voltage and sound data are output to the data analysis and result judgment output unit, so that the monitoring of the transformer can be completed. After the next round of testing, the elastic sheet is loosened, the transformer can be taken out, and the testing of a new transformer is carried out.
A single transformer squealing and aging test is carried out, a transformer with the turn ratio of 5:1400 is tested to work at the time of generating squealing sound of-9 KV, the transformer to be tested is placed in a transformer test seat, the elastic sheet is pressed to enable the pin of the transformer to be in full contact with the elastic sheet, after the test is started, the high-voltage generator unit enables the switch tube to work at the specified working frequency capable of outputting-9 KV, the high-voltage test unit simultaneously monitors the output voltage, the sound capture unit captures and records the squealing sound, and the high-voltage and sound data are output to the data analysis and result judgment output unit, so that the monitoring of the transformer can be completed. Can be used for long-time monitoring and recording.
Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the present application with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above detailed description, various features may be grouped together to streamline the application. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, subject matter of the present application can lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the application should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
The embodiments of the present application have been described in detail, but the present application is not limited to these specific embodiments, and those skilled in the art can make various modifications and modified embodiments based on the concept of the present application, and these modifications and modified embodiments should fall within the scope of the present application.
Claims (10)
1. A transformer testing device, comprising:
the high voltage generating unit is connected with the input end of the transformer, so that the transformer can generate the required high voltage;
the high-voltage testing unit is connected with the output end of the transformer and is used for measuring a high-voltage signal actually generated by the transformer;
and the processing module is connected with the high-voltage testing unit, receives the high-voltage signal transmitted by the high-voltage testing unit and performs data processing to judge whether the transformer is qualified.
2. The transformer test device according to claim 1, wherein the high voltage generating unit includes a DC power supply unit and a switching tube control circuit,
the input end of the switching tube control circuit is connected with the output end of the direct current power supply unit;
and the output end of the switching tube control circuit is connected with the input end of the transformer.
3. The transformer testing device of claim 1, further comprising a sound capturing unit for capturing sound signals emitted when the transformer generates high voltage;
and the processing module receives the sound signal and processes the sound signal so as to judge whether the transformer is qualified.
4. The transformer test device according to claim 3, wherein the processing module comprises a data analysis unit configured to process the sound signal for frequency domain conversion, perform analysis based on the spectral characteristics of howling, and determine whether the sound signal is a howling signal.
5. The transformer testing device according to any one of claims 1 to 4, wherein the processing module further comprises a result determination unit, and the result determination unit determines the high-voltage signal or the howling signal based on a preset standard value of a qualified product to determine whether the transformer is qualified.
6. A method of testing a transformer, comprising:
acquiring a high-voltage signal, wherein the high-voltage signal is a high-voltage signal which is actually generated by the transformer and is acquired by a high-voltage testing unit, and the high voltage of the transformer is generated by exciting the transformer by a high-voltage generating unit;
and processing the high-voltage signal to judge whether the transformer is qualified.
7. The method of claim 6, wherein said generating a high voltage by energizing a transformer with a high voltage generating unit comprises:
the direct current power supply unit is controlled by the switching tube control circuit to generate a high pulse electric signal, and the high pulse electric signal is connected into the transformer and then excites the transformer to generate high voltage.
8. The method of claim 6, further comprising:
acquiring a sound signal, wherein the sound signal is a signal of sound emitted when the transformer generates high voltage and is acquired by a sound capturing unit;
and processing the sound signal to judge whether the transformer is qualified.
9. The method of claim 8, wherein processing the sound signal to determine whether the transformer is acceptable comprises:
and carrying out spectrum analysis on the sound signal, and determining whether the sound signal is a howling signal or not based on the spectral characteristics of the howling.
10. The method of any one of claims 6-9, wherein determining whether the transformer is qualified comprises:
and judging the high-voltage signal or the squeal signal based on a preset standard value of a qualified product, so as to judge whether the transformer is qualified.
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| CN114280404A (en) * | 2021-12-24 | 2022-04-05 | 北京七星飞行电子有限公司 | Angle division testing system and testing method of Scott transformer |
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