CN113466775A - Comprehensive test device and method for metering power transformer - Google Patents
Comprehensive test device and method for metering power transformer Download PDFInfo
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- CN113466775A CN113466775A CN202110668312.XA CN202110668312A CN113466775A CN 113466775 A CN113466775 A CN 113466775A CN 202110668312 A CN202110668312 A CN 202110668312A CN 113466775 A CN113466775 A CN 113466775A
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- 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
Abstract
The invention provides a comprehensive test device and a comprehensive test method for a power transformer for metering, which belong to the technical field of electric energy metering, and comprise a first station, a second station and a third station, wherein the first station, the second station and the third station are respectively integrated with a plurality of test devices; the first testing unit is used for controlling the voltage transformer for metering to test at a first station; the second testing unit is used for controlling the current transformer for metering to test at the first station and the second station; the third testing unit is used for controlling the combined mutual inductor for metering to test at the first station, the second station and the third station; and the centralized control management platform is used for controlling the test flow and processing the test report to obtain the test report. According to the invention, through intelligent and automatic design, scientific, efficient and accurate full-performance detection of the metering power transformer is realized, and the product quality of the metering power transformer in the aspects of operation reliability, metering accuracy and the like is controlled, so that the safe, reliable and accurate operation of a power distribution network is ensured.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to a comprehensive test device and method for a metering power transformer.
Background
The transformer is used for transmitting voltage and current signals to a measuring instrument and a control protection device, can change high voltage into low voltage and change large current into small current, is used for a secondary measurement and protection system, and has the functions of isolating high voltage and ensuring personal and equipment safety.
The electric energy metering device comprises an electric energy metering device, a power transformer and an electric energy meter, wherein the electric energy metering device comprises the main equipment, the transformer is used as a signal source of secondary measuring equipment such as the electric energy meter, the accuracy of the transformer is related to the fairness and justice of trade settlement in each link such as transmission, transformation, transmission, distribution and use, and the reliability of the transformer is related to the safe operation of a power grid. Mutual inductors with the voltage class of 35kV or below are widely used in a power distribution network of a power system, the demand is large, and the operation stability and the metering accuracy of the mutual inductors play a vital role in the safety operation of a power grid and the fairness of electric power trade settlement.
Because the technical and capital thresholds of the current 35kV and below metering power transformer production enterprises are not high, and the product demand is large and wide, the problem that the product quality is not uniform due to low industrial concentration, numerous manufacturers and the like is caused in the current industry, so that the control difficulty of the power grid enterprises on the product quality in the links of equipment type selection, purchasing, monitoring, operation and the like is high. In addition, the quality of the transformer in operation has more problems. The above problems often cause trade settlement disputes and influence on the stable operation of the system.
The full-performance detection of the mutual inductor for enhancing the distribution network metering is an effective means for improving the product quality, but the detection carried out at present mainly comprises items such as errors, transformation ratio, excitation characteristics and the like of the first detection, and the detection equipment and the detection technology cannot completely meet the requirement for ensuring the accurate and reliable operation of the mutual inductor. In addition, detection is carried out according to the current universal verification regulations and national standards, the defects of various detection equipment, discrete equipment, complex flow, multiple manual operation links, low detection efficiency and the like exist, and the existing test conditions cannot meet the requirements of carrying out multi-item, high-frequency and high-time detection on the mutual inductor for metering of 35kV or below and cannot carry out comprehensive performance research test and evaluation on the mutual inductor for metering.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a comprehensive test device and a comprehensive test method for a metering power transformer, which are particularly suitable for metering power transformers of 35kV and below, scientific, efficient and accurate full-performance detection of the metering power transformer is realized through intelligent and automatic design, the operation reliability and the metering accuracy of the metering transformer are improved, and the safe, reliable and accurate operation of a power distribution network is guaranteed.
In order to achieve the above purposes, the technical scheme is as follows:
the utility model provides a power transformer combined test device for measurement which characterized in that includes:
a first station, a second station and a third station which are respectively integrated with a plurality of testing devices;
the first station comprises a first testing unit and a first interaction unit, wherein the first testing unit controls the metering voltage transformer to test at the first station and outputs a first testing result;
the second station comprises a second testing unit and a second interaction unit, wherein the second testing unit controls the current transformer for metering to test at the first station and the second station and outputs a second testing result;
the third station comprises a third testing unit and a third interaction unit, wherein the third testing unit controls the combined mutual inductor for metering to test at the first station, the second station and the third station and outputs a third testing result;
and the centralized control management platform is used for processing the three test results to obtain a test report.
Furthermore, the first station integrated test device comprises devices for appearance and nameplate sign inspection, insulation resistance test, power frequency voltage withstand test of secondary winding to the ground, magnetic saturation margin test, winding polarity test, error repeatability test, power frequency voltage withstand test between primary winding and secondary winding and ground, and partial discharge test;
the second station integrated testing device comprises devices for secondary winding turn-to-turn insulation testing, winding polarity testing, error repeatability testing, variation testing, residual magnetism influence testing and overload capacity testing;
the third station integrated testing device is provided with a device for testing mutual influence of the voltage and the current of the combined mutual inductor.
Furthermore, the method is characterized in that a testing device and a testing wiring which are adopted by the winding polarity test, the error repeatability test and the variation test are the same;
and sequentially carrying out winding polarity test, error repeatability test and variation test, wherein if any one test result is wrong, the other three test results are wrong.
Further, when the voltage transformer for metering is detected, the first testing unit controls the voltage transformer for metering to perform appearance and nameplate mark inspection, insulation resistance testing, power frequency voltage withstand testing of secondary winding to the ground, magnetic saturation margin testing, winding polarity testing, error repeatability testing, power frequency voltage withstand testing between primary winding and the ground and partial discharge testing at a first station, and outputs a first testing result.
Further, when the current transformer for metering is detected, the second testing unit controls the current transformer for metering to perform appearance and nameplate mark inspection, insulation resistance testing, primary-to-secondary and ground power frequency withstand voltage testing and partial discharge testing at the first station, controls the current transformer for metering to perform secondary winding to ground power frequency withstand voltage testing, secondary winding inter-turn insulation testing, error repeatability testing, variation testing, residual magnetism influence testing and overload capability testing at the second station, and outputs a second testing result.
Further, the combined transformer for metering includes a voltage transformer portion and a current transformer portion;
when the combined transformer for metering is detected, the third testing unit controls the voltage transformer part to perform appearance and nameplate mark inspection, insulation resistance testing, power frequency voltage withstand testing of secondary winding to the ground, magnetic saturation margin testing, winding polarity testing, error repeatability testing, power frequency voltage withstand testing of primary winding to the secondary winding and the ground and partial discharge testing at the first station; and
the third testing unit controls the current transformer part to perform appearance and nameplate sign inspection, insulation resistance testing, primary power frequency withstand voltage testing between secondary and ground and partial discharge testing at the first station, and controls the current transformer part to perform secondary winding inter-turn insulation testing, winding polarity testing, error repeatability testing, variation testing, residual magnetism influence testing and overload capability testing at the second station;
and the third testing unit controls the combined mutual inductor for metering to carry out mutual influence testing of voltage and current at a third station and outputs a third testing result.
Further, the comprehensive test device of the metering power transformer further comprises:
the identification positioning unit is connected with the three test units and the centralized control management platform and is used for setting identification codes for the metering power transformers, identifying the identification codes on the metering power transformers which are transferred to the three stations to obtain the circulation path information of the metering power transformers, and sending the circulation path information of each metering power transformer to the centralized control management platform;
the centralized control management platform processes the three test results and the circulation path information to obtain the test report;
the identification code comprises related information of design, production, purchase, network access and operation management of the metering power transformer.
Further, the comprehensive test device of the metering power transformer further comprises:
the personnel management unit is connected with the three test units and the centralized control management platform and is used for sending the distribution information input by the management personnel to the centralized control management platform, and the centralized control management platform sends corresponding personnel distribution information and project distribution information to each station according to the distribution information;
the personnel allocation information comprises relevant information of the testers required by each station;
the item allocation information includes the type and number of test items that each tester needs to perform.
Further, the comprehensive test device of the metering power transformer further comprises:
the first interaction unit is connected with the first test unit and the centralized control management platform, and is used for providing a tester with a first test result of the first test unit for checking, and obtaining and displaying a test report from the centralized control management platform;
the second interaction unit is connected with the second test unit and the centralized control management platform, and is used for providing a tester with a second test result of the second test unit for checking, and obtaining and displaying a test report from the centralized control management platform;
the third interaction unit is connected with the third testing unit and the centralized control management platform, and is used for providing a third testing result for a tester to check the third testing unit, and obtaining and displaying a testing report from the centralized control management platform.
The invention also relates to a comprehensive test method of the power transformer for metering, which comprises the following steps:
when the voltage transformer for metering is detected, the voltage transformer for metering is controlled to perform appearance and nameplate mark inspection, insulation resistance test, power frequency voltage withstand test of secondary winding to the ground, magnetic saturation margin test, winding polarity test, error repeatability test, power frequency voltage withstand test of primary winding to secondary winding and ground and partial discharge test at a first station, and a first test result is output;
when the current transformer for metering is detected, the current transformer for metering is controlled to perform appearance and nameplate mark inspection, insulation resistance test, primary-to-secondary and ground power frequency voltage withstand test and partial discharge test at a first station, and the current transformer for metering is controlled to perform secondary winding to ground power frequency voltage withstand test, secondary winding inter-turn insulation test, error repeatability test, variation test, residual magnetism influence test and overload capability test at a second station, and a second test result is output;
when the combined transformer for metering is detected, the voltage transformer part is controlled to perform appearance and nameplate mark inspection, insulation resistance test, power frequency voltage withstand test of secondary windings to the ground, magnetic saturation margin test, winding polarity test, error repeatability test, power frequency voltage withstand test of primary windings to secondary windings and ground and partial discharge test at a first station; controlling the current transformer part to perform appearance and nameplate mark inspection, insulation resistance test, primary-to-secondary and ground power frequency withstand voltage test and partial discharge test at a first station, and controlling the current transformer part to perform secondary winding inter-turn insulation test, winding polarity test, error repeatability test, variation test, residual magnetism influence test and overload capability test at a second station;
controlling the combined mutual inductor for metering to perform mutual influence test of voltage and current at a third station, and outputting a third test result;
and processing according to the three test results to obtain a test report.
Compared with the prior art, the invention has the beneficial effects that:
the invention sets the first station, the second station and the third station by respectively intelligently designing and integrating a plurality of testing devices, controls the voltage transformer for metering to complete related tests at the first station through the first testing unit, controls the current transformer for metering to complete related tests at the first station and the second station through the second testing unit, controls the combined transformer for metering to complete related tests at the first station, the second station and the third station with the third testing unit, and processes the test results obtained by the testing units through the centralized control management platform to obtain the test report.
The method has the advantages that the test flow tracking is carried out on each metering power transformer based on the identification codes, the management of production monitoring, network access, acceptance and operation of the metering power transformers is enhanced, the operation reliability and the metering accuracy of the metering power transformers are improved, and the safe, reliable and accurate operation of the power distribution network is guaranteed.
Drawings
Fig. 1 is a block diagram of a comprehensive test device for a metering power transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific examples described herein are intended to be illustrative only and are not intended to be limiting. Moreover, all other embodiments that can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort belong to the protection scope of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the integrated test apparatus for a metering power transformer according to the present embodiment includes a metering voltage transformer, a metering current transformer, and a metering combination transformer.
The comprehensive test device of the metering power transformer comprises a first station A, a second station B and a third station C, wherein a plurality of testing devices are integrated with the first station A, the second station B and the third station C respectively. The three stations including the first station a, the second station B, and the third station C may perform different types of test items. In practical application, specific test equipment integrated on three stations is selected for the purposes of improving the equipment integration level on each station to the maximum extent, improving the utilization rate of each test equipment, improving the test efficiency of each station, avoiding testing the same metering power transformer on different stations, simplifying the test flow and reducing test wiring.
The first testing unit 2 is used for controlling the voltage transformer for metering to test at a first station A and outputting a first testing result. The second testing unit 4 is used for controlling the metering current transformer to test at the first station a and the second station B, and outputting a second testing result. The third testing unit 6 is used for controlling the combined mutual inductor for metering to test at the first station a, the second station B and the third station C and outputting a third testing result.
And the centralized control management platform 7 is connected with the three stations and the three test units, and is used for managing the test equipment arranged on the three stations and sending control instructions to the three test units including the first test unit 2, the second test unit 4 and the third test unit 6, the three test units complete respective work flows according to the control instructions, and after the control instructions are completed, the three test results including the first test result, the second test result and the third test result are sent to the centralized control management platform 7, and the centralized control management platform 7 processes the three test results to obtain a test report.
When the comprehensive test device for the metering power transformer is used for detecting the full performance of the metering power transformer, the performance of the metering voltage transformer, the metering current transformer and the metering combined transformer need to be detected respectively.
The full-performance test items of the present embodiment for the metering transformers of 35kV and below include 11 test items of the metering current transformer, 9 test items of the metering voltage transformer, and 13 test items of the metering combined transformer.
The current transformer test items for metering comprise: appearance and nameplate mark inspection, insulation resistance test, secondary winding turn-to-turn insulation test, winding polarity inspection, error test, error repeatability test, variation test, residual magnetism influence test, overload capacity test, primary-to-secondary and ground power frequency withstand voltage test, partial discharge test and the like.
The voltage transformer test items for metering comprise: appearance and nameplate mark inspection, insulation resistance test, power frequency voltage withstand test of secondary winding to the ground, iron core magnetic saturation margin test, winding polarity inspection, error test, error repeatability test, power frequency voltage withstand test of primary winding to secondary winding and ground, partial discharge test and the like.
The combined transformer test items for metering comprise: the method comprises the following steps of appearance and nameplate mark inspection, insulation resistance test, iron core magnetic saturation margin test of a voltage transformer, secondary winding inter-turn insulation test of a current transformer, winding polarity inspection, error test, error repeatability test of the current transformer, variation test of the current transformer, residual magnetism influence test of the current transformer, overload capacity test of the current transformer, power frequency voltage withstand test between primary and secondary and ground, partial discharge test, mutual influence test of voltage and current and the like.
In this embodiment, a first station a, a second station B, and a third station C are set by integrating a plurality of test devices, a measurement voltage transformer is controlled by a first test unit 2 to complete a related test at the first station a, a measurement current transformer is controlled by a second test unit 4 to complete a related test at the first station a and the second station B, a measurement combined transformer is controlled by a third test unit 6 to complete a related test at the first station a, the second station B, and the third station C, and a test result obtained by the test units is processed by a centralized control management platform 7 to obtain a test report.
In a preferred embodiment, the first station A is integrated with a plurality of testing devices for appearance and nameplate sign inspection, insulation resistance testing, power frequency voltage withstand testing of secondary windings to the ground, magnetic saturation margin testing, winding polarity testing, error repeatability testing, power frequency voltage withstand testing between primary windings and secondary windings and ground, and partial discharge testing. All tests are combined in the first station A according to related test principles and test wiring, various tests of the voltage transformer for metering are completed by simply connecting and changing wires (each station can automatically or semi-automatically complete the tests only through once wiring), and the test process is controlled through software of the centralized control management platform 7. The testing equipment on the first station A can be adjusted in type and quantity according to actual needs.
The second station B is integrated with a plurality of detection devices for performing secondary winding turn-to-turn insulation test, winding polarity test, error repeatability test, variation test, residual magnetism influence test and overload capacity test. All tests are combined in a first station A and a second station B according to related test principles and test wiring, appearance and nameplate mark inspection, insulation resistance test, primary-to-secondary and ground power frequency withstand voltage test and partial discharge test are carried out on the current transformer for metering at the first station A, secondary winding interturn insulation test, winding polarity test, error repeatability test, variation test, residual magnetism influence test and overload capacity test are carried out on the current transformer for metering at the second station B, all tests of the voltage transformer for metering are finished by simply connecting and changing wires (each station can automatically or semi-automatically finish the test by only once wiring), and the test process is controlled by software of a centralized control management platform 7. Various tests of the voltage transformer for metering are completed by simply connecting and changing wires (each station can automatically or semi-automatically complete the test by only once wiring), and the test process is controlled by software of the centralized control management platform 7. The test equipment on the first manual position can be adjusted in type and quantity according to actual needs.
The third station C is integrated with a test device for performing a test of the mutual influence of voltage and current. All tests are combined in a first station A, a second station B and a third station C according to a relevant test principle and test wiring, under the control of a centralized control management platform 7, a voltage part in the combined inductor for metering is tested in the first station A, then a current part in the combined transformer for metering is tested in the first station A and the second station B in sequence, and finally the third station C carries out test items which cannot be completed in the first station A and the second station B in the combined transformer for metering. The third testing unit 6 special for the combined mutual inductor for metering at the third station C has three phases, the three phases can be adjusted simultaneously and independently, and the testing of errors and mutual influence quantity of the combined mutual inductor for metering in a distribution network under various working conditions can be realized. Various tests of the voltage transformer for metering are completed by simply connecting and changing wires (each station can automatically or semi-automatically complete the test by only once wiring), and the test process is controlled by software of the centralized control management platform 7. The testing equipment on the third station C can be adjusted in type and quantity according to actual needs.
The testing device and the testing wiring adopted by the winding polarity test, the error repeatability test and the variation test are the same. And during testing, sequentially carrying out winding polarity test, error repeatability test and variation test, wherein if any one of the four tests has a wrong test result, the other three tests have wrong test results.
In a preferred embodiment, when the voltage transformer for metering is detected, the first testing unit 2 controls the voltage transformer for metering to perform appearance and nameplate mark inspection, insulation resistance testing, power frequency voltage withstand testing of secondary winding to the ground, magnetic saturation margin testing, winding polarity testing, error repeatability testing, power frequency voltage withstand testing of primary winding to the ground and partial discharge testing at the first station a, and outputs a first testing result. The test items of the voltage transformer for metering are adjustable.
In a specific embodiment, the test sequence can be appearance and nameplate sign inspection, insulation resistance test, power frequency voltage withstand test of secondary winding to the ground, magnetic saturation margin test, power frequency voltage withstand test between primary winding and secondary winding and ground, partial discharge test, winding polarity test, error repeatability test, error test and variation test. The winding polarity inspection, the variation test, the error repeatability test and the error test are carried out based on an error test circuit, wiring does not need to be changed in the test process, and the test can be completed integrally.
In a preferred embodiment, when the current transformer for metering is detected, the second testing unit 4 controls the current transformer for metering to perform appearance and nameplate mark inspection, insulation resistance testing, primary-to-secondary and ground power frequency withstand voltage testing and partial discharge testing at the first station a, and controls the current transformer for metering to perform secondary winding to ground power frequency withstand voltage testing, secondary winding inter-turn insulation testing, error repeatability testing, variation testing, residual magnetism influence testing and overload capability testing at the second station B. The test items of the current transformer for metering can be adjusted.
In an embodiment, the test sequence can be appearance and nameplate sign inspection, insulation resistance test, secondary winding turn-to-turn insulation test, primary-to-secondary and ground power frequency withstand voltage test, partial discharge test, winding polarity test, variation test, error repeatability test, error test, overload capability test and residual magnetism influence test.
In a preferred embodiment, the combined instrument transformer for metering comprises a voltage transformer part and a current transformer part.
When the combined transformer for metering is detected, the third testing unit 6 controls the voltage transformer part to perform appearance and nameplate mark inspection, insulation resistance testing, power frequency voltage withstand testing of secondary winding to the ground, magnetic saturation margin testing, winding polarity testing, error repeatability testing, power frequency voltage withstand testing of primary winding to the secondary winding and the ground, and partial discharge testing at the first station A. And the third testing unit 6 controls the current transformer part to perform appearance and nameplate sign inspection, insulation resistance testing, primary-to-secondary and ground power frequency withstand voltage testing and partial discharge testing at the first station A, and controls the current transformer part to perform secondary winding inter-turn insulation testing, winding polarity testing, error repeatability testing, variation testing, residual magnetism influence testing and overload capability testing at the second station B. And the third testing unit 6 controls the combined transformer for metering to carry out mutual influence testing of voltage and current at the third station C. The test items of the combined transformer for metering are adjustable.
In a specific embodiment, the test sequence can be appearance and nameplate sign inspection, insulation resistance test, magnetic saturation margin test, power frequency voltage withstand test between primary and secondary and ground, partial discharge test, winding polarity test, error repeatability test, error test, variation test, secondary winding inter-turn insulation test, power frequency voltage withstand test between primary and secondary and ground, partial discharge test winding polarity test, variation test, error repeatability test, overload capability test, residual magnetism influence test, and mutual influence test of voltage and current.
In the preferred embodiment, the first test unit 2, the second test unit 4, and the third test unit 6 are also used to provide the capability to select the type and number of test items to be performed for the tester. The testers on the relevant stations can manually input or select the test items to be performed, and the corresponding test units can upload the selection information of the testers to the centralized control management platform 7.
In a preferred embodiment, the comprehensive test device for the metering power transformer further includes:
and the identification positioning unit 8 is connected with the three stations, the three test units and the centralized control management platform 7, and is used for setting identification codes for the metering power transformers, identifying the identification codes on the metering power transformers which are transferred to the three stations through convection to obtain circulation path information of the metering power transformers, and sending the circulation path information of each metering power transformer to the centralized control management platform 7. And the centralized control management platform 7 processes the three test results and the circulation path information to obtain the test report.
And in the step of sample submission, the samples are bound by the unique two-dimensional code identifiers, so that the full-flow management of the samples is realized. The identification code comprises related information of design, production, purchase, network access and operation management of the metering power transformer. If the sample is a voltage transformer for metering of 35kV or below, the full performance test of the transformer can be completed by the process from the voltage transformer to a voltage station. The full performance test can be completed by transferring the measured current transformer to a current station if the test article is 35kV or below, and the full performance test can be completed by transferring the measured current transformer to a voltage station to complete partial discharge and voltage withstand tests and then transferring the measured current transformer to a current station to complete overload capacity test if the test article is a combined transformer. After the full-performance test of each transformer is completed, test data can be remotely transmitted and stored in a management evaluation system, and original records and reports are automatically generated in the system.
In a preferred embodiment, the comprehensive test device for the metering power transformer further includes:
and the personnel management unit 9 is connected with the three stations, the three test units and the centralized control management platform 7 and is used for sending the distribution information input by the management personnel to the centralized control management platform 7, and the centralized control management platform 7 sends corresponding personnel distribution information and project distribution information to each station according to the distribution information.
The staff allocation information includes information about the testers required for each workstation.
The item allocation information includes the type and number of test items that each tester needs to perform.
In a preferred embodiment, the comprehensive test device for the metering power transformer further includes:
the first interaction unit 1 is arranged at a first station, is connected with the first test unit 2 and the centralized control management platform 7, and is used for providing a tester with a first test result of the first test unit 2 and obtaining and displaying a test report from the centralized control management platform 7.
And the second interaction unit 3 is arranged at a second station, is connected with the second testing unit 4 and the centralized control management platform 7, and is used for providing a second testing result of the second testing unit 4 for a tester to check, and is used for acquiring and displaying a testing report from the centralized control management platform 7.
And the third interaction unit 5 is arranged at a third station, is connected with the third testing unit 6 and the centralized control management platform 7, and is used for providing a third testing result of the third testing unit 6 for testers to check, and is used for acquiring and displaying a testing report from the centralized control management platform 7.
Taking the integrated test flow of the full-performance test of the current transformer for metering of 35kV and below as an example, the method comprises the steps of inputting test article information into a two-dimensional code generating device to form a two-dimensional code by the aid of equipment delivery inspection, and classifying and marking the test articles. The method comprises the steps of transferring a test article to a current test station, inputting information of the test article into a current station test management system through code scanning of a code scanning gun, completing test wiring of the test article, then selecting test items, finally selecting a starting test, wherein the current station automatically or semi-automatically completes each selected test, the general flow is appearance test, insulation resistance test, secondary winding turn-to-turn insulation, power frequency voltage resistance, partial discharge, winding polarity, error repeatability, variation and remanence characteristic test, the test items can be selected or the test sequence can be changed according to individual requirements, and the current station can transmit test data to a full-performance information management evaluation system after the test is finished. And thirdly, generating original records and reports of the test at a full-performance information management and evaluation system end. The formulation principle of the process comprises the steps of testing equipment as few as possible, wire changing as few as possible, relay switching as few as possible and short testing time as possible. The determination reasons of the test sequence such as winding polarity, error, repeatability, variation and remanence influence are as follows: the test equipment and test wiring required by the first four tests are completely the same, and the four tests are continuously completed without changing or switching relays. If the polarity test is unqualified, the error test of the mutual inductor is wrong, so the polarity test is preferentially carried out, and the error test is carried out after the polarity test is passed; and because the repeatability test is the standard deviation of error results which are tested repeatedly for more than 6 times at rated current, the repeatability test is carried out after the error test is finished, and the error test results are taken as a first group of repeatability test data; the variation test is to record the error when the current rises and falls, and the difference between the errors of the two at the same test point is in accordance with the corresponding requirement. When the last repetitive test is carried out, complete (1%) test data of rising and falling of 5% -120% rated current can be recorded and used as variation calculation data, and a current rising and falling test flow of a system is omitted. The method for testing the influence of the remanence is that the difference of errors before and after the magnetizing treatment of the current transformer does not exceed 1/3 of the allowable error limit of a tested product, and the errors before and after the magnetizing treatment all meet the requirement of the error limit value. And taking the last repeated test data as error data before magnetization, measuring the error of the tested object again after magnetization, and comparing the error data before and after magnetization and the difference value according to requirements to finish the residual magnetism influence test.
The related work stations of the comprehensive test of the current transformer for metering of 35kV and below are designed into an integral cabinet, and the integral cabinet comprises a power frequency power supply unit, a partial discharge-free test boosting unit, a current boosting unit, an error test unit, a partial discharge test unit, a control host, a control panel, an insulation resistance test unit, a power frequency voltage withstand test unit and a residual magnetism influence test unit. The cabinet is matched with a touch liquid crystal screen, can be controlled on site, is provided with a network interface, and can transmit local data to a centralized control center. The scanner is used for scanning the detected equipment to confirm the information. The working indicator lamp is arranged on the top of the machine cabinet, and the station state can be displayed.
The related stations of the comprehensive test of the current transformer for metering of 35kV and below comprise a power frequency power supply unit, a non-partial discharge test boosting unit, a current boosting unit, an error test unit, a partial discharge test unit, a control host, a control panel, an insulation resistance test unit, a power frequency voltage withstand test unit, a residual magnetism influence test unit and other test equipment, 11 test items can be realized, intelligent tests for intensively controlling 11 items are realized, and most of the test equipment are electrically connected.
In summary, the comprehensive test device for the metering power transformer integrates and optimizes the test items according to the test principle and the wiring mode based on the standardization, unification and simplification of the test system, and defines the test sequence. The comprehensive and accurate completion of various tests is guaranteed, and the purposes of reducing the test wiring times and improving the test efficiency are achieved.
In this embodiment, the testing devices integrated at each station are all existing devices, and the testing method is based on the technical specifications of a current transformer for metering (Q/CSG1209011), a voltage transformer for metering (Q/CSG1209012) and a combined transformer for metering (Q/CSG1209009) of 10kV/20 kV.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. The utility model provides a power transformer combined test device for measurement which characterized in that includes:
a first station, a second station and a third station which are respectively integrated with a plurality of testing devices;
the first station comprises a first testing unit and a first interaction unit, wherein the first testing unit controls the metering voltage transformer to test at the first station and outputs a first testing result;
the second station comprises a second testing unit and a second interaction unit, wherein the second testing unit controls the current transformer for metering to test at the first station and the second station and outputs a second testing result;
the third station comprises a third testing unit and a third interaction unit, wherein the third testing unit controls the combined mutual inductor for metering to test at the first station, the second station and the third station and outputs a third testing result;
and the centralized control management platform is used for processing the three test results to obtain a test report.
2. The integrated test device for the metering power transformer according to claim 1, wherein the test device integrated at the first station comprises devices for appearance and nameplate sign inspection, insulation resistance test, power frequency voltage withstand test of secondary winding to the ground, magnetic saturation margin test, winding polarity test, error repeatability test, power frequency voltage withstand test between primary winding and secondary winding and the ground, and partial discharge test;
the second station integrated testing device comprises devices for secondary winding turn-to-turn insulation testing, winding polarity testing, error repeatability testing, variation testing, residual magnetism influence testing and overload capacity testing;
the third station integrated testing device is provided with a device for testing mutual influence of the voltage and the current of the combined mutual inductor.
3. The integrated test device for the metering power transformer according to claim 2, wherein the test devices and the test wiring for the winding polarity test, the error repeatability test and the variation test are the same;
and sequentially carrying out winding polarity test, error repeatability test and variation test, wherein if any one test result is wrong, the other three test results are wrong.
4. The integrated test apparatus for a metering power transformer according to claim 2, wherein the first test unit controls the metering voltage transformer to perform appearance and nameplate mark inspection, insulation resistance test, power frequency withstand voltage test of the secondary winding to the ground, magnetic saturation margin test, winding polarity test, error repeatability test, power frequency withstand voltage test of the primary winding to the secondary winding to the ground, and partial discharge test at the first station when the metering voltage transformer is tested, and outputs the first test result.
5. The integrated test apparatus for a metering current transformer according to claim 2, wherein when the metering current transformer is tested, the second test unit controls the metering current transformer to perform appearance and nameplate mark inspection, insulation resistance test, primary-to-secondary and ground power frequency withstand voltage test, and partial discharge test at the first station, and controls the metering current transformer to perform secondary winding to ground power frequency withstand voltage test, secondary winding inter-turn insulation test, error repeatability test, variation test, residual magnetism influence test, and overload capability test at the second station, and outputs the second test result.
6. The integrated test apparatus for a metering power transformer according to claim 2, wherein the combined metering transformer includes a voltage transformer portion and a current transformer portion;
when the combined transformer for metering is detected, the third testing unit controls the voltage transformer part to perform appearance and nameplate mark inspection, insulation resistance testing, power frequency voltage withstand testing of secondary winding to the ground, magnetic saturation margin testing, winding polarity testing, error repeatability testing, power frequency voltage withstand testing of primary winding to the secondary winding and the ground and partial discharge testing at the first station; the third testing unit controls the current transformer part to perform appearance and nameplate sign inspection, insulation resistance testing, primary power frequency withstand voltage testing between secondary and ground and partial discharge testing at the first station, and controls the current transformer part to perform secondary winding inter-turn insulation testing, winding polarity testing, error repeatability testing, variation testing, residual magnetism influence testing and overload capability testing at the second station;
and the third testing unit controls the combined mutual inductor for metering to carry out mutual influence testing of voltage and current at a third station and outputs a third testing result.
7. The integrated test apparatus for a metering power transformer according to claim 1, further comprising:
the identification positioning unit is connected with the three test units and the centralized control management platform and is used for setting identification codes for the metering power transformers, identifying the identification codes on the metering power transformers which are transferred to the three stations to obtain the circulation path information of the metering power transformers, and sending the circulation path information of each metering power transformer to the centralized control management platform;
the centralized control management platform processes the three test results and the circulation path information to obtain the test report;
the identification code comprises related information of design, production, purchase, network access and operation management of the metering power transformer.
8. The integrated test apparatus for a metering power transformer according to claim 1, further comprising:
the personnel management unit is connected with the three test units and the centralized control management platform and is used for sending the distribution information input by the management personnel to the centralized control management platform, and the centralized control management platform sends corresponding personnel distribution information and project distribution information to each station according to the distribution information;
the personnel allocation information comprises relevant information of the testers required by each station;
the item allocation information includes the type and number of test items that each tester needs to perform.
9. The integrated test apparatus for a metering power transformer according to claim 1, further comprising:
the first interaction unit is connected with the first test unit and the centralized control management platform, and is used for providing a tester with a first test result of the first test unit for checking, and obtaining and displaying a test report from the centralized control management platform;
the second interaction unit is connected with the second test unit and the centralized control management platform, and is used for providing a tester with a second test result of the second test unit for checking, and obtaining and displaying a test report from the centralized control management platform;
the third interaction unit is connected with the third testing unit and the centralized control management platform, and is used for providing a third testing result for a tester to check the third testing unit, and obtaining and displaying a testing report from the centralized control management platform.
10. A comprehensive test method for a metering power transformer is characterized by comprising the following steps:
when the voltage transformer for metering is detected, the voltage transformer for metering is controlled to perform appearance and nameplate mark inspection, insulation resistance test, power frequency voltage withstand test of secondary winding to the ground, magnetic saturation margin test, winding polarity test, error repeatability test, power frequency voltage withstand test of primary winding to secondary winding and ground and partial discharge test at a first station, and a first test result is output;
when the current transformer for metering is detected, the current transformer for metering is controlled to perform appearance and nameplate mark inspection, insulation resistance test, primary-to-secondary and ground power frequency voltage withstand test and partial discharge test at a first station, and the current transformer for metering is controlled to perform secondary winding to ground power frequency voltage withstand test, secondary winding inter-turn insulation test, error repeatability test, variation test, residual magnetism influence test and overload capability test at a second station, and a second test result is output;
when the combined transformer for metering is detected, the voltage transformer part is controlled to perform appearance and nameplate mark inspection, insulation resistance test, power frequency voltage withstand test of secondary windings to the ground, magnetic saturation margin test, winding polarity test, error repeatability test, power frequency voltage withstand test of primary windings to secondary windings and ground and partial discharge test at a first station; and
controlling the current transformer part to perform appearance and nameplate mark inspection, insulation resistance test, primary-to-secondary and ground power frequency withstand voltage test and partial discharge test at a first station, and controlling the current transformer part to perform secondary winding inter-turn insulation test, winding polarity test, error repeatability test, variation test, residual magnetism influence test and overload capability test at a second station;
controlling the combined mutual inductor for metering to perform mutual influence test of voltage and current at a third station, and outputting a third test result;
and processing according to the three test results to obtain a test report.
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