CN111257817A - Method for testing excitation characteristic of voltage transformer - Google Patents
Method for testing excitation characteristic of voltage transformer Download PDFInfo
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- CN111257817A CN111257817A CN202010056726.2A CN202010056726A CN111257817A CN 111257817 A CN111257817 A CN 111257817A CN 202010056726 A CN202010056726 A CN 202010056726A CN 111257817 A CN111257817 A CN 111257817A
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- voltage transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a method for testing the excitation characteristic of a voltage transformer, which is based on a portable voltage transformer excitation characteristic tester for testing, and comprises the following steps: connecting a voltage transformer to be tested with the portable voltage transformer excitation characteristic tester by using a connecting wire; opening a power switch of the portable voltage transformer excitation characteristic tester, and entering a test interface of the portable voltage transformer excitation characteristic tester; setting the maximum output voltage and the maximum output current to be tested, and starting a test; when the excitation characteristic tester of the portable voltage transformer rises to the maximum output voltage or the maximum output current, the voltage is automatically reduced, and an excitation characteristic curve and inflection point voltage are output; and reading the required measuring point voltage and exciting current, and storing the test result. In the implementation of the invention, the method can quickly test the excitation characteristic of the voltage transformer.
Description
Technical Field
The invention relates to the technical field of excitation characteristic testing, in particular to a method for testing the excitation characteristic of a voltage transformer.
Background
The excitation characteristic of the voltage transformer is an important factor for determining the performance of the transformer, the measurement of the excitation characteristic of the voltage transformer is particularly important in the test, whether turn-to-turn open circuit exists in the voltage transformer can be checked through the longitudinal comparison of the excitation characteristic curve and historical data, and the excitation characteristic curve is obtained firstly when ferromagnetic resonance analysis and inrush current calculation analysis are carried out.
The traditional method for testing the excitation characteristic of the voltage transformer is mainly characterized in that the measurement is carried out by manually regulating voltage, the manually regulated output voltage of the voltage booster is added to the secondary side of the voltage transformer, a voltmeter and an ammeter are used for reading, and then the excitation characteristic curve is manually returned in seconds; the traditional method has the disadvantages of large volume of used test equipment, heavy weight, complex wiring, poor safety and low test efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for testing the excitation characteristic of a voltage transformer, which can quickly test the excitation characteristic of the voltage transformer, visually display an excitation characteristic curve chart, and read the required measuring point voltage and excitation current through the excitation characteristic curve chart.
In order to solve the above technical problem, an embodiment of the present invention provides a method for testing excitation characteristics of a voltage transformer, where the voltage transformer excitation characteristic test is performed based on a portable voltage transformer excitation characteristic tester, and the method includes:
connecting a voltage transformer to be tested with the portable voltage transformer excitation characteristic tester by using a connecting wire;
after the connection is finished, a power switch of the portable voltage transformer excitation characteristic tester is opened, and a test interface of the portable voltage transformer excitation characteristic tester is accessed;
setting the maximum output voltage and the maximum output current to be tested on a test interface of the portable voltage transformer excitation characteristic tester, and starting a test;
when the excitation characteristic tester of the portable voltage transformer rises to the maximum output voltage or the maximum output current, the voltage is automatically reduced, and an excitation characteristic curve and inflection point voltage are output;
and reading the required measuring point voltage and exciting current based on the exciting characteristic curve and the inflection point voltage, and storing the test result.
In an optional embodiment, the connecting the voltage transformer to be tested with the portable voltage transformer excitation characteristic tester by using a connecting wire includes:
grounding the tail end of a primary winding of the voltage transformer to be tested and the shell by using a connecting wire;
connecting a secondary winding of a voltage transformer to be tested with an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire;
and grounding an ax side grounding terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire.
In an optional embodiment, the connecting the secondary winding of the voltage transformer to be tested with the AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connection line includes:
connecting an a interface in a secondary winding of a voltage transformer to be tested with an A interface in an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire;
and connecting an X interface in a secondary winding of the voltage transformer to be tested with an X interface in an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire.
In an optional embodiment, the setting of the maximum output voltage and the maximum output current to be tested on the test interface of the portable voltage transformer excitation characteristic tester, and starting the start test includes:
displaying the content of a test interface based on a liquid crystal display screen of the portable voltage transformer excitation characteristic tester;
setting the maximum output voltage and the maximum output current to be tested based on the content of the test interface;
after the setup is completed, a start trial in the contents of the test interface is selected, initiating the start of the trial.
In an optional implementation manner, the maximum output voltage cannot exceed a maximum voltage value that can be borne by the secondary side of the voltage transformer to be tested.
In an optional implementation manner, the maximum output current cannot exceed a maximum current value that can be borne by the secondary side of the voltage transformer to be tested.
In an optional embodiment, the automatically reducing the voltage and outputting an excitation characteristic curve and a knee point voltage when the excitation characteristic tester of the portable voltage transformer rises to the maximum output voltage or the maximum output current comprises:
based on a transformer in the portable voltage transformer excitation characteristic tester, raising to the maximum output voltage or the maximum output current;
automatically dropping voltage when the maximum output voltage or the maximum output current is reached;
and after the automatic voltage reduction is finished, displaying and outputting an excitation characteristic curve and inflection point voltage based on a liquid crystal display screen of the portable voltage transformer excitation characteristic tester.
In an optional embodiment, the method further comprises:
and based on the test result, printing a report of the test result by using a printer of the portable voltage transformer excitation characteristic tester.
In the implementation of the invention, the method for testing the excitation characteristic of the voltage transformer is based on a portable voltage transformer excitation characteristic tester for testing, the voltage transformer to be tested is connected with the portable voltage excitation characteristic tester, the tested maximum output voltage and maximum output current are set on the portable voltage transformer excitation characteristic tester, the tester can automatically boost the voltage and automatically draw an excitation characteristic curve chart, and the inflection point is automatically calculated, so that the aim of quick test can be fulfilled, the operation is convenient, and the test efficiency is effectively improved; and the excitation characteristic curve chart can be visually displayed through a screen of the portable voltage excitation characteristic tester, and a report of a test result can be printed through a printer of the portable voltage excitation characteristic tester.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for testing excitation characteristics of a voltage transformer in the practice of the present invention;
fig. 2 is a schematic diagram of the excitation characteristic tester of the portable voltage transformer in the embodiment of the invention;
FIG. 3 is a wiring diagram of the voltage transformer to be tested and the portable voltage transformer excitation characteristic tester in the embodiment of the invention;
fig. 4 is a content of a test interface displayed on a liquid crystal screen of the portable voltage transformer excitation characteristic tester in the embodiment of the present invention;
fig. 5 is an excitation characteristic curve and a knee voltage diagram in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for testing excitation characteristics of a voltage transformer in the implementation of the present invention.
As shown in fig. 1, a method for testing excitation characteristics of a voltage transformer, where the excitation characteristics of the voltage transformer are tested based on a portable excitation characteristics tester of the voltage transformer, includes:
s11: connecting a voltage transformer to be tested with the portable voltage transformer excitation characteristic tester by using a connecting wire;
in the specific implementation process of the invention, the connecting the voltage transformer to be tested with the portable voltage transformer excitation characteristic tester by using the connecting wire comprises the following steps: grounding the tail end of a primary winding of the voltage transformer to be tested and the shell by using a connecting wire; connecting a secondary winding of a voltage transformer to be tested with an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire; and grounding an ax side grounding terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire.
Specifically, with reference to fig. 3, fig. 3 is a diagram illustrating a connection diagram of a voltage transformer to be tested and a portable voltage transformer excitation characteristic tester according to an embodiment of the present invention, where the connecting a secondary winding of the voltage transformer to be tested with an AX-side output terminal in the portable voltage transformer excitation characteristic tester by using a connection line includes: connecting an a interface in a secondary winding of a voltage transformer to be tested with an A interface in an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire; connecting an X interface in a secondary winding of a voltage transformer to be tested with an X interface in an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire; in addition, an X interface in a primary winding of the voltage transformer to be tested is grounded by using a connecting wire; the ax side of the excitation characteristic of the portable voltage transformer is grounded by a connecting wire.
S12: after the connection is finished, a power switch of the portable voltage transformer excitation characteristic tester is opened, and a test interface of the portable voltage transformer excitation characteristic tester is accessed;
in a specific implementation, an alternating current 220V power supply is used for supplying the portable voltage transformer excitation characteristic tester.
S13: setting the maximum output voltage and the maximum output current to be tested on a test interface of the portable voltage transformer excitation characteristic tester, and starting a test;
in a specific implementation process of the present invention, the setting of the maximum output voltage and the maximum output current to be tested on the test interface of the portable voltage transformer excitation characteristic tester, and the starting of the test includes: the content of a test interface is displayed on the basis of the liquid crystal display screen of the portable voltage transformer excitation characteristic tester, and the content of the test interface displayed by the liquid crystal display screen of the portable voltage transformer excitation characteristic tester in the embodiment of the invention is shown in the attached figure 4 in combination with the attached figure 4; setting the maximum output voltage and the maximum output current to be tested based on the content of the test interface; after the setup is completed, a start trial in the contents of the test interface is selected, initiating the start of the trial.
It should be noted that the maximum output voltage cannot exceed the maximum voltage value that the secondary side of the voltage transformer to be tested can bear; the maximum output current cannot exceed the maximum current value borne by the secondary side of the voltage transformer to be tested, and the range is 0-12A; in addition, when the portable voltage transformer excitation characteristic tester rises to the maximum output voltage or the maximum output current in the test, the voltage is automatically reduced; in the test process, once the voltage or the current exceeds the set maximum output voltage or the maximum output current, the portable voltage transformer excitation characteristic tester automatically opens the protection current transformer.
S14: when the excitation characteristic tester of the portable voltage transformer rises to the maximum output voltage or the maximum output current, the voltage is automatically reduced, and an excitation characteristic curve and inflection point voltage are output;
in a specific implementation process of the present invention, when the excitation characteristic tester of the portable voltage transformer rises to the maximum output voltage or the maximum output current, the step of automatically reducing the voltage and outputting an excitation characteristic curve and a knee point voltage includes: based on a transformer in the portable voltage transformer excitation characteristic tester, raising to the maximum output voltage or the maximum output current; automatically dropping voltage when the maximum output voltage or the maximum output current is reached; after the automatic voltage reduction is completed, a liquid crystal display screen based on the portable voltage transformer excitation characteristic tester displays and outputs an excitation characteristic curve and inflection point voltage, and the attached drawing 5 is combined to show the excitation characteristic curve and the inflection point voltage diagram in the embodiment of the invention.
S15: and reading the required measuring point voltage and exciting current based on the exciting characteristic curve and the inflection point voltage, and storing the test result.
In addition, a method for testing the excitation characteristic of the voltage transformer further comprises the following steps: and based on the test result, printing a report of the test result by using a printer of the portable voltage transformer excitation characteristic tester.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating an excitation characteristic tester of a portable voltage transformer according to an embodiment of the present invention.
As shown in fig. 2, a portable voltage transformer excitation characteristic tester includes: the device comprises a liquid crystal display screen, a keyboard, a printer, a communication interface, a transformer, a power socket and a power switch;
the liquid crystal display screen is used for displaying a test interface of the portable voltage transformer excitation characteristic tester and is also used for displaying an output excitation characteristic curve and inflection point voltage;
the keyboard is used for inputting and setting the maximum output voltage and the maximum output current and is also used for the operation of moving a cursor;
the printer is used for printing a report of the test result;
the communication interface comprises a USB interface and an RS232 interface, the USB interface is used for accessing the software of the USB flash disk upgrading tester or exporting data, and the RS232 interface is used for connecting a computer to perform tests and providing a communication protocol;
the transformer is used for being connected with a voltage transformer to be tested and is also used for boosting and reducing voltage;
the power socket is used for connecting an alternating current 220V power supply;
and the power switch is used for controlling the energization or the deenergization of the portable voltage transformer excitation characteristic tester.
In the implementation of the invention, the method for testing the excitation characteristic of the voltage transformer is based on a portable voltage transformer excitation characteristic tester for testing, the voltage transformer to be tested is connected with the portable voltage excitation characteristic tester, the tested maximum output voltage and maximum output current are set on the portable voltage transformer excitation characteristic tester, the tester can automatically boost the voltage and automatically draw an excitation characteristic curve chart, and the inflection point is automatically calculated, so that the aim of quick test can be fulfilled, the operation is convenient, and the test efficiency is effectively improved; and the excitation characteristic curve chart can be visually displayed through a screen of the portable voltage excitation characteristic tester, and a report of a test result can be printed through a printer of the portable voltage excitation characteristic tester.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, or the like.
In addition, the method for testing the excitation characteristic of the voltage transformer provided by the embodiment of the invention is described in detail, a specific example is adopted herein to explain the principle and the implementation of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A method for testing the excitation characteristic of a voltage transformer is characterized in that the excitation characteristic test of the voltage transformer is performed based on a portable voltage transformer excitation characteristic tester, and the method comprises the following steps:
connecting a voltage transformer to be tested with the portable voltage transformer excitation characteristic tester by using a connecting wire;
after the connection is finished, a power switch of the portable voltage transformer excitation characteristic tester is opened, and a test interface of the portable voltage transformer excitation characteristic tester is accessed;
setting the maximum output voltage and the maximum output current to be tested on a test interface of the portable voltage transformer excitation characteristic tester, and starting a test;
when the excitation characteristic tester of the portable voltage transformer rises to the maximum output voltage or the maximum output current, the voltage is automatically reduced, and an excitation characteristic curve and inflection point voltage are output;
and reading the required measuring point voltage and exciting current based on the exciting characteristic curve and the inflection point voltage, and storing the test result.
2. The method for testing the excitation characteristic of the voltage transformer according to claim 1, wherein the step of connecting the voltage transformer to be tested with the portable voltage transformer excitation characteristic tester by using a connecting wire comprises the following steps:
grounding the tail end of a primary winding of the voltage transformer to be tested and the shell by using a connecting wire;
connecting a secondary winding of a voltage transformer to be tested with an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire;
and grounding an ax side grounding terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire.
3. The method for testing the excitation characteristic of the voltage transformer according to claim 2, wherein the connecting the secondary winding of the voltage transformer to be tested with the AX-side output terminal in the portable voltage transformer excitation characteristic tester by using the connecting wire comprises:
connecting an a interface in a secondary winding of a voltage transformer to be tested with an A interface in an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire;
and connecting an X interface in a secondary winding of the voltage transformer to be tested with an X interface in an AX side output terminal in the portable voltage transformer excitation characteristic tester by using a connecting wire.
4. The method for testing the excitation characteristic of the voltage transformer according to claim 1, wherein the setting of the maximum output voltage and the maximum output current to be tested on the test interface of the portable excitation characteristic tester of the voltage transformer comprises:
displaying the content of a test interface based on a liquid crystal display screen of the portable voltage transformer excitation characteristic tester;
setting the maximum output voltage and the maximum output current to be tested based on the content of the test interface;
after the setup is completed, a start trial in the contents of the test interface is selected, initiating the start of the trial.
5. The method as claimed in claim 4, wherein the maximum output voltage cannot exceed the maximum voltage value that the secondary side of the voltage transformer under test can bear.
6. The method as claimed in claim 4, wherein the maximum output current cannot exceed the maximum current value that the secondary side of the voltage transformer to be tested can bear.
7. The method of claim 1, wherein the step of automatically reducing the voltage and outputting the excitation characteristic curve and the knee point voltage when the portable voltage transformer excitation characteristic tester rises to the maximum output voltage or the maximum output current comprises:
based on a transformer in the portable voltage transformer excitation characteristic tester, raising to the maximum output voltage or the maximum output current;
automatically dropping voltage when the maximum output voltage or the maximum output current is reached;
and after the automatic voltage reduction is finished, displaying and outputting an excitation characteristic curve and inflection point voltage based on a liquid crystal display screen of the portable voltage transformer excitation characteristic tester.
8. The method for testing the excitation characteristic of the voltage transformer according to claim 1, wherein the method further comprises the following steps:
and based on the test result, printing a report of the test result by using a printer of the portable voltage transformer excitation characteristic tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010056726.2A CN111257817A (en) | 2020-01-17 | 2020-01-17 | Method for testing excitation characteristic of voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010056726.2A CN111257817A (en) | 2020-01-17 | 2020-01-17 | Method for testing excitation characteristic of voltage transformer |
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| CN111257817A true CN111257817A (en) | 2020-06-09 |
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| CN202010056726.2A Pending CN111257817A (en) | 2020-01-17 | 2020-01-17 | Method for testing excitation characteristic of voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112924920A (en) * | 2021-02-02 | 2021-06-08 | 中国南方电网有限责任公司超高压输电公司柳州局 | Portable measuring device and parameter measuring method for high-voltage electromagnetic voltage transformer |
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Application publication date: 20200609 |