CN113325354B - System and method for testing errors of electronic transformer for distribution network - Google Patents
System and method for testing errors of electronic transformer for distribution network Download PDFInfo
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- CN113325354B CN113325354B CN202110443125.1A CN202110443125A CN113325354B CN 113325354 B CN113325354 B CN 113325354B CN 202110443125 A CN202110443125 A CN 202110443125A CN 113325354 B CN113325354 B CN 113325354B
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- 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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Abstract
The invention provides a system and a method for testing errors of an electronic transformer for a distribution network, which are characterized in that after the electronic transformer for the distribution network to be tested and an electronic transformer calibrator, and a standard transformer corresponding to the electronic transformer for the distribution network to be tested and the electronic transformer calibrator are electrically connected, test contents are set in an error test unit according to a selected test mode, and after parameters such as primary and secondary rated values of the standard transformer and the electronic transformer for the distribution network to be tested, secondary loads of the electronic transformer for the distribution network to be tested and the like, error test is carried out, and output data and test results are displayed on line. The method and the system output the transformer data in a digital mode, are favorable for intelligent development of the transformer substation, have powerful error testing function based on the error testing unit, can intuitively display waveforms and various effective data, have the functions of data storage, off-line analysis, data printing, data query and the like, and are convenient for data processing.
Description
Technical Field
The invention relates to the field of error testing, and in particular relates to a system and a method for testing errors of an electronic transformer for a distribution network.
Background
The distribution network is a core transmission link of the power system, the reliability of distribution equipment is crucial to the operation reliability of the distribution network, and the quality and performance of the distribution network directly influence the operation safety of the distribution network and the power supply reliability of the distribution network. The traditional transformer has the problems of large volume, easy saturation, easy resonance and the like, the low-power transformer has the advantages of small volume, simple insulation structure, wide measurement range, and the like, but the signal processing and interface part of the low-power transformer is different from the traditional transformer, and the stability and reliability of the low-power transformer lack of deep system research. In particular, the checking technical means and specifications related to stability and reliability are imperfect in both the IEC standard and the national standard, thereby severely restricting the improvement and perfection of the performance of the low-power consumption transformer and restricting the application of the low-power consumption transformer in a power system. Therefore, the system in-depth research on the stability and reliability of the low-power consumption transformer is particularly important. The factors influencing the reliability of the transformer in the secondary fusion device include external environment change, installation position, electromagnetic interference, mutual influence of current and voltage and the like, and key influencing factors need to be confirmed and countermeasures need to be provided. Miniaturization of power distribution equipment is a necessary trend of future development, and also promotes the technology of transformers in the power distribution equipment to develop toward miniaturization, and the traditional transformers are difficult to meet miniaturization requirements, and although the low-power-consumption transformers can be miniaturized, problems of low accuracy, weak anti-interference capability and the like caused by miniaturization are required to be solved. Therefore, how to accurately and efficiently test the errors of equipment for distribution network becomes an urgent problem to be solved.
Disclosure of Invention
In order to solve the technical problem of reduced accuracy caused by miniaturization of a transformer in distribution equipment in the prior art, the invention provides a system for testing errors of an electronic transformer for a distribution network, which comprises:
the electronic transformer calibrator is used for setting test parameters, generating test commands, determining the load of the electronic transformer for the distribution network to be tested, collecting first data output by the electronic transformer for the distribution network to be tested and second data output by a standard transformer corresponding to the electronic transformer for the distribution network to be tested, and calculating an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data;
and the controller is used for controlling the output of the variable frequency power supply according to the test command of the error test unit so as to control the opening and closing of the current/voltage contactor, and realizing that the current booster connected with the electronic transformer for the distribution network to be tested performs current boosting/voltage boosting according to the test parameters set by the error test unit.
Further, the electronic type transformer for the distribution network to be tested comprises an electronic type voltage transformer and an electronic type current transformer, and the standard transformer corresponding to the electronic type transformer for the distribution network to be tested comprises a self-boosting standard voltage transformer corresponding to the electronic type voltage transformer and a self-boosting standard current transformer corresponding to the electronic type current transformer.
Further, the system further comprises:
the cabinet is used for accommodating the electronic transformer calibrator, the controller, the test load and the variable-frequency power supply;
the alarm device is positioned at the top of the cabinet and used for alarming when other parts of the system except the alarm device and the cabinet are in fault;
and the printing device is connected with the electronic transformer calibrator and is used for printing the test result output by the electronic transformer calibrator.
Further, the system further comprises an error testing unit, which is installed in the electronic transformer calibrator, and is used for setting testing parameters, generating testing commands, calculating error testing results of the electronic transformer for the distribution network to be tested according to the first data and the second data transmitted by the electronic transformer calibrator, and displaying and outputting the error testing results, wherein:
a first selecting unit for selecting a first test content and selecting at least one of a second test content, wherein the first test content is an electronic transformer for a distribution network to be tested, the first test content comprises an electronic current transformer for measurement, an electronic current transformer for protection, an electronic voltage transformer for measurement and an electronic voltage transformer for protection, and the second test content comprises an A phase, a B phase and a C phase of the selected first test content;
An automatic test unit for determining that a mode for testing an error of the first test content is an automatic execution mode;
the single test unit is used for triggering a standard transformer corresponding to the first test content when the mode for testing the error of the first test content is a manual execution mode, and a current booster/booster connected with the first test content performs current boosting/voltage boosting according to a set fourth parameter item so as to execute the error test of the first test content selected once;
a first parameter unit for setting a first parameter item, wherein the first parameter item includes first and second rated values of a first test content and first and second rated values of a standard transformer corresponding to the first test content;
the second parameter unit is used for setting a second parameter item when the test mode is an automatic execution mode, wherein the second parameter item is a standard transformer corresponding to the first test content and a current rise/voltage rise amplitude value of a current booster/booster connected with the first test content;
a third parameter unit for setting a third parameter item, wherein the third parameter item is a secondary load value of the first test content;
A fourth parameter unit for setting a fourth parameter item when the test mode is a manual execution mode, wherein the fourth parameter item includes a number of tests and a standard transformer corresponding to the first test content, and a single test percentage setting value of a booster/booster connected to the first test content;
and the initialization unit is used for resetting the variable frequency power supply to zero, and enabling the standard transformer corresponding to the first test content and the current booster/voltage booster connected with the first test content to perform current boosting/voltage boosting according to the set first parameter item, the second parameter item and the third parameter item when the test mode is the automatic execution mode so as to execute error test of the first test content.
Further, the error testing unit further includes;
the data display unit is used for displaying the standard transformer in the test process, a waveform chart of current rise/voltage rise of the current booster connected with the first test content, collected data output by the first test content and error test results, and displaying query content when query operation is carried out;
a storage selection unit for selecting a storage path of the data collected by the error test unit and the output data;
The information input unit is used for triggering a dialog box for inputting the test related information so as to complete information input;
a printing unit configured to trigger a print operation dialog to complete printing of the data stored in the storage path determined by the storage selection unit;
and the query unit is used for triggering a query operation dialog box, selecting the stored data file and displaying the data file on the data display unit.
According to another aspect of the present invention, there is provided a method for testing an error of an electronic transformer for a distribution network, the method comprising:
connecting an electronic transformer for a distribution network to be tested with an electronic transformer calibrator, and connecting a standard transformer corresponding to the electronic transformer for the distribution network to be tested with the electronic transformer calibrator;
the electronic transformer calibrator sets testing parameters, generates testing commands, and transmits the testing commands to the controller and the standard transformer corresponding to the electronic transformer for the distribution network to be tested;
the electronic transformer calibrator determines the load of the electronic transformer for the distribution network to be tested according to the set test parameters;
the controller controls the output of the variable frequency power supply according to the test command of the electronic transformer calibrator so as to control the opening and closing of the current/voltage contactor, and the current booster connected with the electronic transformer for the distribution network to be tested is used for boosting/boosting according to the test parameters set by the error test unit;
The standard transformer performs current rising/voltage rising according to the test parameters set by the electronic transformer calibrator, and outputs second data to the electronic transformer calibrator;
the electronic transformer calibrator collects first data output by an electronic transformer for a distribution network to be tested and second data output by a standard transformer corresponding to the electronic transformer for the distribution network to be tested;
and the electronic transformer calibrator calculates an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data, and displays and outputs the error test result.
Further, the electronic transformer calibrator sets test parameters, generates a test command, calculates an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data transmitted by the electronic transformer calibrator, and displays and outputs the test result, including:
selecting a first test content and selecting at least one of a second test content, wherein the first test content comprises an electronic current transformer for measurement, an electronic current transformer for protection, an electronic voltage transformer for measurement and an electronic voltage transformer for protection, and the second test content comprises an A phase, a B phase and a C phase of the selected first test content;
Selecting a test mode, wherein the test mode comprises an automatic execution mode and a manual execution mode;
setting a first parameter item, wherein the first parameter item comprises a first rated value and a second rated value of a first test content and a first rated value and a second rated value of a standard transformer corresponding to the first test content;
when the selected test mode is an automatic execution mode, setting a second parameter item, wherein the second parameter item is a standard transformer corresponding to the first test content and a boosting/current-lifting amplitude value of a current booster/booster connected with the first test content;
setting a third parameter item, wherein the third parameter item is a secondary load value of the first test content;
when the test mode is a manual execution mode, setting a fourth parameter item, wherein the fourth parameter item comprises the test times, a standard transformer corresponding to the first test content and a single test percentage set value of a booster/booster connected with the first test content;
initializing a test, resetting the variable frequency power supply to zero, and when the test mode is an automatic execution mode, enabling a standard transformer corresponding to the first test content and a current booster/booster connected with the first test content to perform current boosting/boosting according to the set first parameter item, second parameter item and third parameter item so as to execute error test of the first test content; when the test mode is a manual execution mode, triggering a standard transformer corresponding to the first test content, and performing current up/voltage up by a current up/voltage up device connected with the first test content according to a set fourth parameter item so as to execute error test of the first test content selected once;
And generating and displaying the first data and the second data transmitted by the electronic transformer calibrator, and outputting a test result.
Further, when the selected test mode is the automatic execution mode, setting the second parameter item includes:
when the first test content is the electronic current transformer for measurement, the second parameter items are 1%, 5%, 20%, 100%, 120% and 200%;
when the first test content is the electronic current transformer for protection, setting the second parameter item to be 100%;
when the first test content is the electronic voltage transformer for measurement, the second parameter items are 80%, 100% and 120%;
when the first test content is the electronic voltage transformer for protection, the second parameter items are set to be 2%, 5%, 100%, 150% and 190%.
Further, setting the third parameter item includes;
when the first test content is the electronic current transformer for measurement and the electronic current transformer for protection, the set third parameter items are 2k omega, 20k omega and 2M omega;
when the first test contents are the electronic voltage transformer for measurement and the electronic voltage transformer for protection, the third parameter items are set to be 5mΩ and 10mΩ.
Further, the method further comprises:
displaying a standard transformer current-rising/voltage-rising waveform diagram in the test process, acquiring data and error test results output by the first test content, and displaying query content when query operation is performed; and/or
Inputting and storing test related information; and/or
Selecting data acquired by the error testing unit and a storage path of the output data to store the data; and/or
Printing the stored data; and/or
And querying the stored data file for display.
According to the system and the method for testing the errors of the electronic transformer for the distribution network, after the electronic transformer for the distribution network to be tested and the electronic transformer calibrator, and the standard transformer corresponding to the electronic transformer for the distribution network to be tested and the electronic transformer calibrator are electrically connected, test contents are set in an error test unit according to a selected test mode, and after parameters such as primary and secondary rated values of the standard transformer and the electronic transformer for the distribution network to be tested, secondary loads of the electronic transformer for the distribution network to be tested are measured, error test is carried out, and output data and test results are displayed on line. The method and the system output transformer data in a digital mode, are favorable for intelligent development of the transformer substation, are suitable for analog output error test of the electronic transformer, can be used for basic accuracy test, compound error test and harmonic error measurement of the electronic transformer, can also be used for comparison test of the electronic transformer and the traditional transformer, are flexible in use mode, have powerful error test function based on an error test unit, can intuitively display waveforms and various effective data, have the functions of data storage, off-line analysis, data printing, data query and the like, and are convenient for data processing.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
fig. 1 is a schematic diagram of a system for testing errors of an electronic transformer for a distribution network according to a preferred embodiment of the present invention;
FIG. 2 is an interface schematic of an error testing unit according to a preferred embodiment of the present invention;
fig. 3 is a flowchart of a method of testing errors of an electronic transformer for a distribution network according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic diagram of a system for testing errors of an electronic transformer for a distribution network according to a preferred embodiment of the present invention. As shown in fig. 1, a system 100 for testing an electronic transformer error for a network according to the preferred embodiment includes:
the electronic transformer calibrator 101 is configured to set test parameters, generate a test command, determine a load 104 of an electronic transformer for a distribution network to be tested, collect first data output by the electronic transformer for the distribution network to be tested and second data output by a standard transformer 102 corresponding to the electronic transformer for the distribution network to be tested, and calculate an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data; the electronic type transformer for the distribution network to be tested comprises an electronic type voltage transformer and an electronic type current transformer, the standard transformer corresponding to the electronic type transformer for the distribution network to be tested comprises a self-boosting standard voltage transformer corresponding to the electronic type voltage transformer and a self-boosting standard current transformer corresponding to the electronic type current transformer, and the load 104 is arranged on a panel of the electronic type transformer calibrator and is used for providing load for the electronic type transformer for the distribution network to be tested when the electronic type transformer error for the distribution network to be tested is tested.
Preferably, the electronic transformer for the distribution network to be tested comprises an electronic voltage transformer and an electronic current transformer, and the standard transformer corresponding to the electronic transformer for the distribution network to be tested comprises a self-boosting standard voltage transformer corresponding to the electronic voltage transformer and a self-boosting standard current transformer corresponding to the electronic current transformer.
And the controller 103 is used for controlling the output of the variable frequency power supply according to the test command so as to control the opening and closing of the current/voltage contactor, and realizing the current rising/rising of the current/rising of the voltage of the current/voltage booster connected with the electronic transformer 106 for the distribution network to be tested according to the set test parameters.
Preferably, the system further comprises:
the cabinet is used for accommodating the electronic transformer calibrator, the controller, the test load and the variable-frequency power supply;
the alarm device is positioned at the top of the cabinet and used for alarming when other parts of the system except the alarm device and the cabinet are in fault;
and the printing device is connected with the electronic transformer calibrator and is used for printing the test result output by the electronic transformer calibrator.
In the preferred embodiment, the electronic transformer calibrator compares the analog output signal of the electronic transformer with the signal converted after the output of the standard transformer, and measures the comparison difference and the angular difference. The electronic transformer calibrator is a standard 2U industrial personal computer, and is pulled out from the cabinet and opened to turn up the screen cover when in use. And after the power is on, the calibrator is automatically started. The self-current-rising standard current transformer is connected to a current-rising terminal of the self-current-rising standard current transformer from a back surface of the cabinet through a current-rising connecting terminal. The secondary output terminal of the self-current-rising standard current transformer is connected to the four-core aerial plug on the back of the cabinet through a four-core cable. The primary loop is connected according to the standard current transformer nameplate. The self-boosting standard voltage transformer is connected to a boosting terminal of the self-boosting standard voltage transformer from a back side 'boosting' wiring terminal of the cabinet. The secondary output terminal of the self-boosting standard voltage transformer is connected to the four-core aerial socket on the back of the cabinet through the standard voltage high end and the standard voltage low end of the four-core cable, and the primary low end is reliably grounded. The test load is provided on the rear panel of the calibrator. The load state is changed by a dial switch during manual test. The dial switch is idle in the "OFF" state. The electronic voltage transformer has 5mΩ and 10mΩ options, and the electronic current transformer has 2kΩ, 20kΩ and 2mΩ options. If the load of the measured transformer is other values, corresponding load resistors can be prepared automatically and connected in parallel with the secondary output end of the measured transformer.
Preferably, the system further includes an error testing unit 105, which is installed in the electronic transformer calibrator 101, and is configured to set a test parameter, generate a test command, calculate an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data transmitted by the electronic transformer calibrator, and display and output the error test result, where:
a first selecting unit for selecting a first test content and selecting at least one of a second test content, wherein the first test content is an electronic transformer for a distribution network to be tested, the first test content comprises an electronic current transformer for measurement, an electronic current transformer for protection, an electronic voltage transformer for measurement and an electronic voltage transformer for protection, and the second test content comprises an A phase, a B phase and a C phase of the selected first test content;
an automatic test unit for determining that a mode for testing an error of the first test content is an automatic execution mode;
the single test unit is used for triggering a standard transformer corresponding to the first test content when the mode for testing the error of the first test content is a manual execution mode, and a current booster/booster connected with the first test content performs current boosting/voltage boosting according to a set fourth parameter item so as to execute the error test of the first test content selected once;
A first parameter unit for setting a first parameter item, wherein the first parameter item includes first and second rated values of a first test content and first and second rated values of a standard transformer corresponding to the first test content;
the second parameter unit is used for setting a second parameter item when the test mode is an automatic execution mode, wherein the second parameter item is a standard transformer corresponding to the first test content and a current rise/voltage rise amplitude value of a current booster/booster connected with the first test content;
a third parameter unit for setting a third parameter item, wherein the third parameter item is a secondary load value of the first test content;
a fourth parameter unit for setting a fourth parameter item when the test mode is a manual execution mode, wherein the fourth parameter item includes a number of tests and a standard transformer corresponding to the first test content, and a single test percentage setting value of a booster/booster connected to the first test content;
and the initialization unit is used for resetting the variable frequency power supply to zero, and enabling the standard transformer corresponding to the first test content and the current booster/voltage booster connected with the first test content to perform current boosting/voltage boosting according to the set first parameter item, the second parameter item and the third parameter item when the test mode is the automatic execution mode so as to execute error test of the first test content.
Preferably, the error testing unit 105 further comprises;
the data display unit is used for displaying a standard transformer current rise/voltage rise waveform diagram in the test process, acquiring data output by the first test content and error test results, and displaying query content when query operation is performed;
a storage selection unit for selecting a storage path of the data collected by the error test unit and the output data;
the information input unit is used for triggering a dialog box for inputting the test related information so as to complete information input;
a printing unit configured to trigger a print operation dialog to complete printing of the data stored in the storage path determined by the storage selection unit;
and the query unit is used for triggering a query operation dialog box, selecting the stored data file and displaying the data file on the data display unit.
FIG. 2 is an interface schematic of an error testing unit according to a preferred embodiment of the present invention. In the preferred embodiment, the error testing unit is designed using the virtual instrument interface design software LabView.
As shown in fig. 2, the interface of the error testing unit includes:
the first selection unit, namely a test content composite box, wherein the selected first test content comprises an ECT for measurement, an ECT for protection, an EVT for measurement and an EVT for protection, the setting is carried out by double clicking a square radio button on the left side of each test content, and the double clicking of the button can be canceled again. Further, at least one of the a phase, the B phase, and the C phase of the first test content that has been already determined may be set, and in fig. 2, the a phase, the B phase, and the C phase are set, so that the set secondary output connection of the ECT for measurement is identical to the setting of the a phase, the B phase, and the C phase. The test content composite box selects content that is valid for both the automatic execution mode and the manual execution mode.
An automatic test unit, an automatic test button, which determines that a mode for testing an error of the first test content is an automatic execution mode when the button is clicked;
the single test unit, the single test button, confirms a manual execution mode when the automatic test button is not selected, and at the moment, the single test button is clicked after the first test content is determined, the primary voltage, the secondary voltage, the primary current and the secondary current of the standard transformer corresponding to the first test content, the primary voltage, the secondary voltage, the primary current and the secondary current of the first test content, the load of the first test content, the test times and the single test percentage, so that the error test of the first test content can be completed once;
the first parameter unit, in fig. 2, includes a standard primary voltage, a standard secondary voltage, a measured primary voltage, a measured secondary voltage, a standard primary current, a standard secondary current, a measured primary current, and a measured secondary current, and selects a corresponding standard primary voltage, standard secondary voltage, or standard primary current, and standard secondary current according to a standard transformer corresponding to the determined first test content; the rating is selected in the drop-down box, or the rating may be entered in the text box. The nominal values of the standard transformer and the first test content are allowed to be different. The rating setting is valid for both the automatic execution mode and the manual execution mode.
The second parameter unit, in fig. 2, corresponds to a test point check box, which is valid only for the automatic execution mode in which the test system sequentially boosts/flows up to the measurement point and tests errors according to the setting of the test point. The test points are associated with test contents, and after the test contents are set to be in a test category, the corresponding test points are lightened by gray. Double clicking the square radio button on the left side of the test point makes the setting, and double clicking the button again cancels the setting. 1%, 5%, 20%, 100%, 120% and 200% of the ECT test points for measurement; 100% of ECT test points for protection are provided; the EVT test points for measurement have 80%, 100% and 120%; the protection EVT test points are 2%, 5%, 100%, 150% and 190%.
The third parameter unit, corresponding to the load composite box in fig. 2, is empty at default. The electronic voltage transformer has 5mΩ and 10mΩ options, and the electronic current transformer has 2kΩ, 20kΩ and 2mΩ options. The "load" only tests for idle errors if set to idle, and tests for idle errors and load errors if set not to idle. The load setting mode can also be that a load is set on a dial switch on a back plate of the calibrator.
And a fourth parameter unit, corresponding to the test times in fig. 2, wherein the single test percentage setting value is provided with two check boxes, and the check boxes are used for setting the test times when the error test is manually executed and the single test percentage setting value of the current rise/voltage rise of the standard transformer.
The initialization unit, corresponding to the initialization button in fig. 2, automatically returns the variable frequency power supply to zero if the variable frequency power supply is not in the zero position when the initialization button is clicked. When the test mode is the automatic execution mode, the system closes the up-flow loop contactor if the ECT for measurement or the ECT for protection is selected, and closes the up-flow loop contactor if the EVT for measurement or the EVT for protection is selected, according to the selected test content.
The data display unit corresponds to the waveform diagram and the data table on the right side in fig. 2 and is used for displaying the current rise/voltage rise waveform diagram of the standard transformer in the test process, the collected data output by the first test content and the error test result, and the query content is displayed when the query operation is performed;
a storage selection unit, corresponding to the data storage path check box in fig. 2, for selecting the storage path of the data collected by the error test unit and the output data;
The information input unit corresponds to the information input button in fig. 2 and is used for triggering a dialog box for inputting the test related information to complete information input.
A print unit, corresponding to the print button in fig. 2, for triggering a print operation dialog box to complete printing of the data stored in the storage path determined by the storage selection unit;
the query unit corresponds to the query button in fig. 2, and is used for triggering a query operation dialog box, selecting the stored data file and displaying the data file on the data display unit.
Fig. 3 is a flowchart of a method of testing errors of an electronic transformer for a distribution network according to a preferred embodiment of the present invention. As shown in fig. 3, a method 300 for testing errors of an electronic transformer for a distribution network according to the preferred embodiment starts in step 301.
In step 301, connecting an electronic transformer for a distribution network to be tested with an electronic transformer calibrator, and connecting a standard transformer corresponding to the electronic transformer for the distribution network to be tested with the electronic transformer calibrator;
in step 302, the electronic transformer calibrator sets test parameters, generates test commands, and transmits the test commands to the controller and the standard transformers corresponding to the electronic transformers for the distribution network to be tested;
In step 303, the electronic transformer calibrator determines the load of the electronic transformer for the distribution network to be tested according to the set test parameters;
in step 304, the controller controls the output of the variable frequency power supply according to the test command of the electronic transformer calibrator so as to control the opening and closing of the current/voltage contactor, and the current booster connected with the electronic transformer for the distribution network to be tested is realized to perform current boosting/voltage boosting according to the test parameters set by the error test unit;
in step 305, the standard transformer performs current up/voltage up according to the test parameters set by the electronic transformer calibrator, and outputs second data to the electronic transformer calibrator;
in step 306, the electronic transformer calibrator collects first data output by the electronic transformer for the distribution network to be tested and second data output by the standard transformer corresponding to the electronic transformer for the distribution network to be tested;
in step 307, the electronic transformer calibrator calculates an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data, and displays and outputs the error test result.
Preferably, the electronic transformer calibrator sets test parameters, generates a test command, calculates an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data transmitted by the electronic transformer calibrator, and displays and outputs the error test result including:
Selecting a first test content and selecting at least one of a second test content, wherein the first test content comprises an electronic current transformer for measurement, an electronic current transformer for protection, an electronic voltage transformer for measurement and an electronic voltage transformer for protection, and the second test content comprises an A phase, a B phase and a C phase of the selected first test content;
selecting a test mode, wherein the test mode comprises an automatic execution mode and a manual execution mode;
setting a first parameter item, wherein the first parameter item comprises a first rated value and a second rated value of a first test content and a first rated value and a second rated value of a standard transformer corresponding to the first test content;
when the selected test mode is an automatic execution mode, setting a second parameter item, wherein the second parameter item is a standard transformer corresponding to the first test content and a boosting/current-lifting amplitude value of a current booster/booster connected with the first test content;
setting a third parameter item, wherein the third parameter item is a secondary load value of the first test content;
when the test mode is a manual execution mode, setting a fourth parameter item, wherein the fourth parameter item comprises the test times, a standard transformer corresponding to the first test content and a single test percentage set value of a booster/booster connected with the first test content;
Initializing a test, resetting the variable frequency power supply to zero, and when the test mode is an automatic execution mode, enabling a standard transformer corresponding to the first test content and a current booster/booster connected with the first test content to perform current boosting/boosting according to the set first parameter item, second parameter item and third parameter item so as to execute error test of the first test content; when the test mode is a manual execution mode, triggering a standard transformer corresponding to the first test content, and performing current up/voltage up by a current up/voltage up device connected with the first test content according to a set fourth parameter item so as to execute error test of the first test content selected once;
and calculating an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data transmitted by the electronic transformer calibrator, and displaying and outputting the error test result.
Preferably, when the selected test mode is the automatic execution mode, setting the second parameter item includes:
when the first test content is the electronic current transformer for measurement, the second parameter items are 1%, 5%, 20%, 100%, 120% and 200%;
when the first test content is the electronic current transformer for protection, setting the second parameter item to be 100%;
When the first test content is the electronic voltage transformer for measurement, the second parameter items are 80%, 100% and 120%;
when the first test content is the electronic voltage transformer for protection, the second parameter items are set to be 2%, 5%, 100%, 150% and 190%.
Preferably, setting the third parameter item includes;
when the first test content is the electronic current transformer for measurement and the electronic current transformer for protection, the set third parameter items are 2k omega, 20k omega and 2M omega;
when the first test content is the electronic voltage transformer for measurement and the electronic voltage transformer for protection, the third parameter items are set to be 5MΩ and 10MΩ.
Preferably, the method further comprises:
displaying a standard transformer current-rising/voltage-rising waveform diagram in the test process, acquiring data and error test results output by the first test content, and displaying query content when query operation is performed; and/or
Inputting and storing test related information; and/or
Selecting data acquired by the error testing unit and a storage path of the output data to store the data; and/or
Printing the stored data; and/or
And querying the stored data file for display.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (9)
1. A system for testing errors in an electronic transformer for a distribution network, the system comprising:
the electronic transformer calibrator is used for setting test parameters, generating test commands, determining the load of the electronic transformer for the distribution network to be tested, collecting first data output by the electronic transformer for the distribution network to be tested and second data output by a standard transformer corresponding to the electronic transformer for the distribution network to be tested, and calculating an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data;
The controller is used for controlling the output of the variable-frequency power supply according to the test command so as to control the opening and closing of the current/voltage contactor, and realizing the current rising/rising of the current/rising of the voltage of the current/voltage contactor connected with the electronic transformer for the distribution network to be tested according to the set test parameters;
the error testing unit is arranged in the electronic transformer calibrator, and is used for setting testing parameters, generating testing commands, calculating error testing results of the electronic transformer for the distribution network to be tested according to first data and second data transmitted by the electronic transformer calibrator, and displaying and outputting the error testing results, wherein the error testing results comprise the following steps:
a first selecting unit for selecting a first test content and selecting at least one of a second test content, wherein the first test content is an electronic transformer for a distribution network to be tested, the first test content comprises an electronic current transformer for measurement, an electronic current transformer for protection, an electronic voltage transformer for measurement and an electronic voltage transformer for protection, and the second test content comprises an A phase, a B phase and a C phase of the selected first test content;
an automatic test unit for determining that a mode for testing an error of the first test content is an automatic execution mode;
The single test unit is used for triggering a standard transformer corresponding to the first test content when the mode for testing the error of the first test content is a manual execution mode, and a current booster/booster connected with the first test content performs current boosting/voltage boosting according to a set fourth parameter item so as to execute the error test of the first test content selected once;
a first parameter unit for setting a first parameter item, wherein the first parameter item includes first and second rated values of a first test content and first and second rated values of a standard transformer corresponding to the first test content;
the second parameter unit is used for setting a second parameter item when the test mode is an automatic execution mode, wherein the second parameter item is a standard transformer corresponding to the first test content and a current rise/voltage rise amplitude value of a current booster/booster connected with the first test content;
a third parameter unit for setting a third parameter item, wherein the third parameter item is a secondary load value of the first test content;
a fourth parameter unit for setting a fourth parameter item when the test mode is a manual execution mode, wherein the fourth parameter item includes a number of tests and a standard transformer corresponding to the first test content, and a single test percentage setting value of a booster/booster connected to the first test content;
And the initialization unit is used for resetting the variable frequency power supply to zero, and enabling the standard transformer corresponding to the first test content and the current booster/voltage booster connected with the first test content to perform current boosting/voltage boosting according to the set first parameter item, the second parameter item and the third parameter item when the test mode is the automatic execution mode so as to execute error test of the first test content.
2. The system of claim 1, wherein the electronic transformer for the distribution network to be tested comprises an electronic voltage transformer and an electronic current transformer, and the standard transformer corresponding to the electronic transformer for the distribution network to be tested comprises a self-boosting standard voltage transformer corresponding to the electronic voltage transformer and a self-boosting standard current transformer corresponding to the electronic current transformer.
3. The system of claim 1, wherein the system further comprises:
the cabinet is used for accommodating the electronic transformer calibrator, the controller, the test load and the variable-frequency power supply;
the alarm device is positioned at the top of the cabinet and used for alarming when other parts of the system except the alarm device and the cabinet are in fault;
and the printing device is connected with the electronic transformer calibrator and is used for printing the test result output by the electronic transformer calibrator.
4. The system of claim 1, wherein the error testing unit further comprises:
the data display unit is used for displaying the standard transformer in the test process, a waveform chart of current rise/voltage rise of the current booster connected with the first test content, collected data output by the first test content and error test results, and displaying query content when query operation is carried out;
a storage selection unit for selecting a storage path of the data collected by the error test unit and the output data;
the information input unit is used for triggering a dialog box for inputting the test related information so as to complete information input;
a printing unit configured to trigger a print operation dialog to complete printing of the data stored in the storage path determined by the storage selection unit;
and the query unit is used for triggering a query operation dialog box, selecting the stored data file and displaying the data file on the data display unit.
5. A method for testing errors in an electronic transformer for a distribution network using the system of any one of claims 1 to 4, the method comprising:
connecting an electronic transformer for a distribution network to be tested with an electronic transformer calibrator, and connecting a standard transformer corresponding to the electronic transformer for the distribution network to be tested with the electronic transformer calibrator;
The electronic transformer calibrator sets testing parameters, generates testing commands, and transmits the testing commands to the controller and the standard transformer corresponding to the electronic transformer for the distribution network to be tested;
the electronic transformer calibrator determines the load of the electronic transformer for the distribution network to be tested according to the set test parameters;
the controller controls the output of the variable frequency power supply according to the test command of the electronic transformer calibrator so as to control the opening and closing of the current/voltage contactor, and the current booster connected with the electronic transformer for the distribution network to be tested is used for boosting/boosting according to the test parameters set by the error test unit;
the standard transformer performs current rising/voltage rising according to the test parameters set by the electronic transformer calibrator, and outputs second data to the electronic transformer calibrator;
the electronic transformer calibrator collects first data output by an electronic transformer for a distribution network to be tested and second data output by a standard transformer corresponding to the electronic transformer for the distribution network to be tested;
and the electronic transformer calibrator calculates an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data, and displays and outputs the error test result.
6. The method of claim 5, wherein the electronic transformer calibrator sets test parameters, generates test commands, calculates an error test result of the electronic transformer for the distribution network to be tested based on the first data and the second data transmitted by the electronic transformer calibrator, and displaying and outputting the test result comprises:
selecting a first test content and selecting at least one of a second test content, wherein the first test content comprises an electronic current transformer for measurement, an electronic current transformer for protection, an electronic voltage transformer for measurement and an electronic voltage transformer for protection, and the second test content comprises an A phase, a B phase and a C phase of the selected first test content;
selecting a test mode, wherein the test mode comprises an automatic execution mode and a manual execution mode;
setting a first parameter item, wherein the first parameter item comprises a first rated value and a second rated value of a first test content and a first rated value and a second rated value of a standard transformer corresponding to the first test content;
when the selected test mode is an automatic execution mode, setting a second parameter item, wherein the second parameter item is a standard transformer corresponding to the first test content and a boosting/current-lifting amplitude value of a current booster/booster connected with the first test content;
Setting a third parameter item, wherein the third parameter item is a secondary load value of the first test content;
when the test mode is a manual execution mode, setting a fourth parameter item, wherein the fourth parameter item comprises the test times, a standard transformer corresponding to the first test content and a single test percentage set value of a booster/booster connected with the first test content;
initializing a test, resetting the variable frequency power supply to zero, and when the test mode is an automatic execution mode, enabling a standard transformer corresponding to the first test content and a current booster/booster connected with the first test content to perform current boosting/boosting according to the set first parameter item, second parameter item and third parameter item so as to execute error test of the first test content; when the test mode is a manual execution mode, triggering a standard transformer corresponding to the first test content, and performing current up/voltage up by a current up/voltage up device connected with the first test content according to a set fourth parameter item so as to execute error test of the first test content selected once;
and calculating an error test result of the electronic transformer for the distribution network to be tested according to the first data and the second data transmitted by the electronic transformer calibrator, and displaying and outputting the error test result.
7. The method of claim 6, wherein setting the second parameter item when the selected test mode is an automatic execution mode comprises:
when the first test content is the electronic current transformer for measurement, the second parameter items are 1%, 5%, 20%, 100%, 120% and 200%;
when the first test content is the electronic current transformer for protection, setting the second parameter item to be 100%;
when the first test content is the electronic voltage transformer for measurement, the second parameter items are 80%, 100% and 120%;
when the first test content is the electronic voltage transformer for protection, the second parameter items are set to be 2%, 5%, 100%, 150% and 190%.
8. The method of claim 6, wherein setting a third parameter item comprises;
when the first test content is the electronic current transformer for measurement and the electronic current transformer for protection, the set third parameter items are 2k omega, 20k omega and 2M omega;
when the first test content is the electronic voltage transformer for measurement and the electronic voltage transformer for protection, the third parameter items are set to be 5MΩ and 10MΩ.
9. The method of claim 6, wherein the method further comprises:
Displaying a standard transformer current-rising/voltage-rising waveform diagram in the test process, acquiring data and error test results output by the first test content, and displaying query content when query operation is performed; and/or
Inputting and storing test related information; and/or
Selecting data acquired by the error testing unit and a storage path of the output data to store the data; and/or
Printing the stored data; and/or
And querying the stored data file for display.
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