CN107290399B - Transformer water content measuring device based on PDC/FDS medium response method - Google Patents
Transformer water content measuring device based on PDC/FDS medium response method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
Abstract
The invention belongs to the technical field of transformer junction edge aging, and particularly relates to a transformer water content measuring device based on a PDC/FDS medium response method. Two oil sample cups with equal volume are arranged in the iron box body and are used for containing the oil samples to be tested in the same batch, and a test electrode in each oil sample cup is directly connected with the conducting rod; the upper end cover and the lower end cover of the oil sample cup are respectively provided with an oil sample cup cover; an oil sample cup groove is formed below the oil sample cup, and the lower end of the oil sample cup groove is connected with a device box body; the bottom of the groove of the oil sample cup is provided with a through hole for connecting the lower end of the conducting rod with the pressurizing conducting wire through the hole; the measuring terminal is clamped on the conducting rod, the tail end of the measuring terminal is connected with the input end of a PDC/FDS measuring system control circuit in the testing circuit through a measuring wire, and the output end of the PDC/FDS measuring system control circuit is connected with the input end of the input/output client through a COM interface data wire. The invention can greatly reduce the test time and ensure the comprehensive frequency domain.
Description
Technical Field
The invention belongs to the technical field of transformer junction edge aging, and particularly relates to a transformer water content measuring device based on a PDC/FDS medium response method.
Background
The moisture in the oil immersed power transformer has serious influence on the electrical life and mechanical life of the transformer insulation system, accelerates the aging of the oil paper insulation material, jeopardizes the safe operation of the transformer, and the dielectric measurement method is a main application method aiming at the oil paper insulation diagnosis of the transformer at present, but has the defect of long time consumption or insufficient wide frequency domain, and lacks a simple and efficient water content measurement device in the transformer at present.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a transformer water content measuring device based on a PDC/FDS medium response method, and aims to build a device capable of rapidly measuring the dielectric response of a transformer oil paper insulation system and rapidly determining the aging insulation degree of a transformer with any voltage level according to water content data in the insulation system.
In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme:
the transformer water content measuring device based on the PDC/FDS medium response method is characterized in that two equal-volume oil sample cups are arranged in an iron box body, the two equal-volume oil sample cups are used for containing the transformer oil samples to be measured in the same batch, each oil sample cup is internally provided with a test electrode and a conductive rod, the test electrode is directly connected with the conductive rod, the conductive rod fixes the position of the test electrode in the oil sample cup, and the conductive rod is communicated with the test electrode and a power supply lead; the upper end cover and the lower end cover of the oil sample cup are respectively provided with an oil sample cup cover; an oil sample cup groove is formed below the oil sample cup, and the lower end of the oil sample cup groove is connected with a device box body; the upper end of the oil sample cup groove is opened for placing an oil sample cup, and the bottom of the oil sample cup groove is provided with a through hole for connecting the lower end of the conducting rod with the pressurizing conducting wire through the hole; the measuring terminal is clamped on the conducting rod, the tail end of the measuring terminal is connected to the input end of a PDC/FDS measuring system control circuit in a testing circuit arranged on one side of the iron box body through a measuring wire, and the output end of the PDC/FDS measuring system control circuit is connected with the input end of the input/output client through a COM interface data wire.
The oil sample cup covers at the upper end and the lower end are all fixed by fastening clips, and the measuring terminal is a movable butterfly clip.
The PDC/FDS measurement system control circuit comprises a frequency response data acquisition module, a frequency response measurement and control module, a PDC/FDS data conversion integration module, a data analysis processing module and an input/output system which are sequentially connected.
The frequency response data acquisition module is a field detection unit, the module sampling data comprise frequency response voltage data and pressurization voltage data, the frequency response voltage data are connected to the frequency response measurement and control module in series through a flat cable, the frequency response voltage data are sampled and obtained through a measurement terminal, the pressurization voltage data are provided for a test electrode through a test circuit, and the pressurization voltage data are simultaneously sent to the data conversion integration module.
The frequency response measurement and control module comprises a PDC test circuit and an FDS test circuit which are connected in parallel, and the PDC test circuit and the FDS test circuit are respectively controlled to be pressurized by two measurement modes of PDC and FDS of the measurement terminal and the test electrode; the frequency response measurement and control module realizes measurement control of the measurement terminal and the test electrode, and the PDC test circuit is used for providing a voltage regulator circuit (10) -6 The voltage value corresponding to the required frequency in the range of Hz-1Hz and respondingMeasuring data; the FDS test circuit provides the test electrode with a voltage corresponding to the required frequency in the range of more than 1Hz, and performs response data measurement.
The PDC/FDS data conversion integration module consists of an AD data converter, a time domain/frequency domain data conversion circuit and a data integration circuit, wherein the AD data converter is connected with the time domain/frequency domain data conversion circuit in series, the time domain/frequency domain data conversion circuit is connected with the data integration circuit in series, and data are sequentially transmitted; after the electronic signal obtained by the frequency response measurement and control module is converted into a digital signal through an AD data converter, the time domain data is converted into the same frequency domain data through a time domain/frequency domain data conversion circuit, and finally the data integration circuit realizes the combination of the two sections of frequency domain data to form a complete frequency response map.
The data analysis processing module comprises a database and a data comparison module; the database is connected in series with a data reading/writing module and is used for storing the paper insulation thickness x and y of the transformer oil paper insulation system, the standard value frequency spectrum response data of the moisture content in oil, the ambient temperature and the moisture content data in oil; the data comparison module collects all data in the database through reading operation, completes modeling under corresponding environment temperature and transformer insulation geometric parameters, performs comparison analysis of modeling data and measurement data, and finally sends an analysis result of water content in oil to the input/output client; X-Y model calculation algorithm in the data comparison module: and (3) taking the integrated data result as a target group, calculating a water content standard value in the oil by using a particle swarm algorithm through database data, and comparing and analyzing the water content standard value with the integrated data result to obtain the water content value in the oil and the ageing degree of the transformer insulation system.
The input/output system comprises a data read/write module, a display, a printer, a keyboard and other devices, wherein the data read/write module is respectively connected with the display, the printer and the keyboard device through USB connecting wires, so that the functions of displaying test results, printing and inputting condition data are realized.
The X value in the X-Y data in the X-Y model calculation algorithm is radial thickness data of a supporting insulating plate in the transformer insulation geometry, and the value Y is radial length data of a baffle in the transformer insulation geometry.
The method for testing the transformer water content measuring device based on the PDC/FDS medium response method comprises the following specific implementation steps:
(1) The transformer insulating oil to be detected is equally placed in the two oil sample cups, so that after the test electrode is completely immersed in the oil sample cups, the oil sample cup covers are covered, and the fastening clamp is screwed down, so that the oil sample cups are firmly contacted with the oil sample cup covers and are prevented from leaking;
(2) The measuring terminal is clamped on the conducting rod at the upper part of the oil sample cup cover, so that good contact between the measuring terminal and the conducting rod is ensured, and leakage current can be effectively tested;
(3) The power supply is turned on to supply power to the measurement system, whether the display screen displays or not is checked, and the normal operation of the power supply state of the system is ensured;
(4) Checking system display interface data to ensure the normal working state of the system;
(5) Sequentially inputting the insulation geometric data X-Y of the transformer and the environmental temperature data, and ensuring that the system can complete X-Y data modeling;
(6) Clicking a start test button to perform frequency response test, and recording a test result through a display screen and a printer after the test is finished.
The invention has the advantages and effects that:
according to the invention, the influence factors of the environmental temperature and the insulation geometric dimension, namely the ratio of the oil to the paperboard, on the calculation result are fully considered, the dielectric loss curve test of the time domain PDC is limited to be carried out at low frequency, the maximum is 0.1Hz, and the dielectric loss curve of the part higher than 0.1Hz is tested in a frequency domain FDS mode, so that the low frequency test of <0.1Hz is avoided, the test time is greatly shortened, and the comprehensive of the frequency domain is ensured. The method aims at establishing a full-band dielectric loss curve test meeting 1000kHz to 0.001MHz, the test time is reduced to 2 hours, the measurement requirement of the water content in the transformer oil is rapidly measured in full-band high-precision, and the device has the characteristics of high efficiency, accuracy and wide application range, and is suitable for popularization and application in the power industry.
The present invention will be described in further detail with reference to the drawings and the specific examples, but is not limited to the examples.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the operation of the present invention;
FIG. 3 is an explanatory diagram of X-Y data in the X-Y model calculation module.
In the figure: the device comprises an iron box body 1, a conducting rod 2, a fastening clamp 3, an oil sample cup cover 4, an oil sample cup 5, a measuring terminal 6, a testing electrode 7, an oil sample cup groove 8, a pressurizing conducting wire 9, a measuring conducting wire 10, a testing circuit 11, a PDC/FDS measuring system control circuit 12 and an input-output client 13.
Detailed Description
The invention relates to a transformer water content measuring device based on a PDC/FDS medium response method, which is shown in fig. 1, and fig. 1 is a schematic structural diagram of the device. Two isovolumetric oil sample cups 5 are arranged in the iron box body 1, the two isovolumetric oil sample cups 5 are used for containing the oil samples to be tested in the same batch, each oil sample cup 5 is internally provided with a test electrode 7 and a conductive rod 2, the test electrode 7 is directly connected with the conductive rod 2, the test electrode 7 is used for applying required voltage to the oil samples, the conductive rod 2 is used for fixing the position of the test electrode 7 in the oil sample cup 5, and the conductive rod 2 is communicated with the test electrode 7 and a power supply lead 9.
The upper end and the lower end of the oil sample cup 5 are provided with oil sample cup covers 4, and the oil sample cup covers 4 at the upper end and the lower end are fixed by fastening clips 3; an oil sample cup groove 8 is arranged below the oil sample cup 5, the lower end of the oil sample cup groove 8 is connected with the device box body 1 to play a role in fixing, the upper end of the oil sample cup groove 8 is opened for placing the oil sample cup 5, a through hole is arranged at the bottom of the oil sample cup groove 8 and used for connecting the lower end of the conducting rod 2 with a pressurizing lead 9 through the hole; the measuring terminal 6 is a movable butterfly clamp, and the measuring terminal 6 is clamped at the upper end part of the conducting rod 2 and is used for measuring response data of an oil sample and can be conveniently taken down after measurement; the tail end of the measurement terminal 6 is connected by a measurement wire 10 to the input of a PDC/FDS measurement system control circuit 12 in a test circuit 11.
The PDC is a polarized depolarization current method, the FDS is a dielectric spectrum measuring method, and the method is two methods for measuring the insulation state of the transformer which are the mainstream at present.
As shown in fig. 2, fig. 2 is a schematic diagram of the operation of the present invention. The right side of the iron box body 1 is provided with a testing circuit 11, the testing circuit 11 comprises a PDC/FDS measuring system control circuit 12 and an input and output client 13, the output end of the PDC/FDS measuring system control circuit 12 is connected with the input end of the input and output client 13 through a COM interface data line, and the input and output client 13 is used for inputting required parameters and displaying a testing result.
The PDC/FDS measurement system control circuit 12 includes a frequency response data acquisition module, a frequency response measurement and control module, a PDC/FDS data conversion integration module, a data analysis processing module, and an input/output system, which are sequentially connected.
The frequency response data acquisition module is a field detection unit, and the module sampling data comprises frequency response voltage data and pressurizing voltage data, and is connected to the frequency response measurement and control module in series through a flat cable. The frequency response voltage data is sampled and obtained through the measuring terminal, the pressurizing voltage data is provided for the testing electrode through the testing circuit, and meanwhile, the pressurizing voltage data is sent to the data conversion integration module. The frequency response measurement and control module comprises a PDC test circuit and an FDS test circuit which are connected in parallel, and the PDC test circuit and the FDS test circuit are respectively controlled to be pressurized by using two measurement modes of PDC and FDS of the measurement terminal and the test electrode. Frequency response measurement and control module for realizing measurement terminal and test electricity
Measurement control of the poles, the test electrodes were provided with a voltage measuring circuit consisting of 10 -6 The frequency required in the range of Hz-1Hz corresponds to the voltage value and the response data is measured. The FDS test circuit provides the test electrode with a voltage corresponding to the required frequency in the range of more than 1Hz, and performs response data measurement. The PDC/FDS data conversion integration module consists of an AD data converter, a time domain/frequency domain data conversion circuit and a data integration circuit, wherein the AD data converter is connected with the time domain/frequency domain data conversion circuit in series, the time domain/frequency domain data conversion circuit is connected with the data integration circuit in series, and data are sequentially transmitted. After the electronic signal obtained by the frequency response measurement and control module is converted into a digital signal through an AD data converter, the time domain data is converted into the same frequency domain data through a time domain/frequency domain data conversion circuit, and finally the data integration circuit realizes the combination of the two sections of frequency domain data to form a complete frequency response map.
The data analysis processing module comprises a database and a data comparison module. The database is connected in series with a data reading/writing module and is used for storing the paper insulation thickness x and y of the transformer oil paper insulation system, the standard value frequency spectrum response data of the moisture content in oil, the ambient temperature and the moisture content data in oil. The data comparison module collects all data in the database through reading operation, completes modeling under corresponding environment temperature and transformer insulation geometric parameters, performs comparison analysis of modeling data and measurement data, and finally sends an analysis result of water content in oil to the input/output client; X-Y model calculation algorithm in the data comparison module: and (3) taking the integrated data result as a target group, calculating a water content standard value in the oil by using a particle swarm algorithm through database data, and comparing and analyzing the water content standard value with the integrated data result to obtain the water content value in the oil and the ageing degree of the transformer insulation system.
The input/output system comprises a data read/write module, a display, a printer, a keyboard and other devices, wherein the data read/write module is respectively connected with the display, the printer and the keyboard device through USB connecting wires, so that the functions of displaying test results, printing and inputting condition data are realized.
As shown in FIG. 3, FIG. 3 is a diagram illustrating the X-Y data in the X-Y model calculation algorithm in the data comparison module. The X value in the X-Y data is the radial thickness data of the supporting insulating plate in the transformer insulation geometry, and the value Y is the radial length data of the baffle in the transformer insulation geometry.
The method for testing by using the transformer water content measuring device based on the PDC/FDS medium response method comprises the following specific implementation steps:
(1) The transformer insulating oil to be detected is equally placed in the two oil sample cups, so that after the test electrode is completely immersed in the oil sample cups, the oil sample cup covers are covered, and the fastening clamp is screwed down, so that the oil sample cups are firmly contacted with the oil sample cup covers and are prevented from leaking;
(2) The measuring terminal is clamped on the conducting rod at the upper part of the oil sample cup cover, so that good contact between the measuring terminal and the conducting rod is ensured, and leakage current can be effectively tested;
(3) The power supply is turned on to supply power to the measurement system, whether the display screen displays or not is checked, and the normal operation of the power supply state of the system is ensured;
(4) Checking system display interface data to ensure the normal working state of the system;
(5) Sequentially inputting the insulation geometric data X-Y of the transformer and the environmental temperature data, and ensuring that the system can complete X-Y data modeling;
(6) Clicking a start test button to perform frequency response test, and recording a test result through a display screen and a printer after the test is finished.
The foregoing detailed description of the invention is illustrative of the invention and is not to be construed as limiting the invention, and the specific embodiment can be determined according to the technical scheme and practical situation of the invention, and any other modification or equivalent substitution which is made for the technical scheme of the invention is included in the scope of the invention.
Claims (3)
1. A transformer water content measuring device based on PDC/FDS medium response method is characterized in that: two constant-volume oil sample cups (5) are arranged in the iron box body (1), a test electrode (7) and a conductive rod (2) are directly connected in each oil sample cup (5), the conductive rod (2) fixes the position of the test electrode (7) in the oil sample cup (5), and the conductive rod (2) is communicated with the test electrode (7) and a pressurizing conductive wire (9); the upper end cover and the lower end cover of the oil sample cup (5) are respectively provided with an oil sample cup cover (4); an oil sample cup groove (8) is arranged below the oil sample cup (5), and the lower end of the oil sample cup groove (8) is connected with an iron box body (1); the upper end of the oil sample cup groove (8) is opened for placing the oil sample cup (5), and a through hole is arranged at the bottom of the oil sample cup groove (8) for connecting the lower end of the conducting rod (2) with the pressurizing conducting wire (9) through the hole; the measuring terminal (6) is clamped on the conducting rod (2), the tail end of the measuring terminal (6) is connected to the input end of a PDC/FDS measuring system control circuit (12) in a testing circuit (11) arranged on one side of the iron box body (1) through a measuring wire (10), and the output end of the PDC/FDS measuring system control circuit (12) is connected with the input end of an input/output client (13) through a COM interface data wire; control circuit of the PDC/FDS measurement system (12)The device comprises a frequency response data acquisition module, a frequency response measurement and control module, a PDC/FDS data conversion integration module, a data analysis processing module and an input and output system which are sequentially connected; the frequency response data acquisition module is a field detection unit, sampling data of the module comprise frequency response voltage data and pressurization voltage data, the frequency response voltage data are connected to the frequency response measurement and control module in series through a flat cable, the frequency response voltage data are obtained through sampling of a measurement terminal, the pressurization voltage data are provided for a test electrode through a test circuit, and meanwhile the pressurization voltage data are sent to the data conversion integration module; the frequency response measurement and control module comprises a PDC test circuit and an FDS test circuit which are connected in parallel, and the PDC test circuit and the FDS test circuit are respectively controlled to be pressurized by applying PDC and FDS measurement modes of the measurement terminal and the test electrode; the frequency response measurement and control module realizes measurement control of the measurement terminal and the test electrode, and the PDC test circuit is used for providing a voltage regulator circuit (10) -6 The required frequency in the range of Hz-1Hz corresponds to the voltage value, and response data measurement is carried out; the FDS test circuit provides a voltage value corresponding to the required frequency in the range of more than 1Hz for the test electrode, and carries out response data measurement; the PDC/FDS data conversion integration module consists of an AD data converter, a time domain/frequency domain data conversion circuit and a data integration circuit, wherein the AD data converter is connected with the time domain/frequency domain data conversion circuit in series, the time domain/frequency domain data conversion circuit is connected with the data integration circuit in series, and data are sequentially transmitted; after an electronic signal obtained by the frequency response measurement and control module is converted into a digital signal through an AD data converter, time domain data are converted into the same frequency domain data through a time domain/frequency domain data conversion circuit, and finally, the data integration circuit realizes the combination of two sections of frequency domain data to form a complete frequency response map; the data analysis processing module comprises a database and a data comparison module; the database is connected in series with a data reading/writing module and is used for storing the paper insulation thickness x and y of the transformer oil paper insulation system, the standard value frequency spectrum response data of the moisture content in oil, the ambient temperature and the moisture content data in oil; the data comparison module collects all data in the database through reading operation, completes modeling under corresponding environment temperature and transformer insulation geometric parameters, performs comparison analysis of modeling data and measurement data, and sends an analysis result of water content in oil to the input/output client; data contrast mouldX-Y model calculation algorithm in block: using the integrated data result as a target group, calculating a water content standard value in oil by using a particle swarm algorithm through database data, and comparing and analyzing the water content standard value with the integrated data result to obtain a water content value in oil and the ageing degree of a transformer insulation system; the X value in the X-Y data in the X-Y model calculation algorithm is radial thickness data of a supporting insulating plate in the transformer insulation geometry, and the value Y is radial length data of a baffle in the transformer insulation geometry.
2. The transformer water content measuring device based on the PDC/FDS medium response method as set forth in claim 1, wherein: the input/output system comprises a data read/write module, a display, a printer and keyboard equipment, wherein the data read/write module is respectively connected with the display, the printer and the keyboard equipment through USB connecting wires, so that the functions of displaying test results, printing and inputting condition data are realized.
3. The method for testing the transformer water content measuring device based on the PDC/FDS medium response method according to claim 1 comprises the following specific implementation steps:
(1) The transformer insulating oil to be detected is equally placed in the two oil sample cups, so that after the test electrode is completely immersed in the oil sample cups, the oil sample cup covers are covered, and the fastening clamp is screwed down, so that the oil sample cups are firmly contacted with the oil sample cup covers and are prevented from leaking;
(2) The measuring terminal is clamped on the conducting rod at the upper part of the oil sample cup cover, so that good contact between the measuring terminal and the conducting rod is ensured, and leakage current can be effectively tested;
(3) The power supply is turned on to supply power to the measurement system, whether the display screen displays or not is checked, and the normal operation of the power supply state of the system is ensured;
(4) Checking system display interface data to ensure the normal working state of the system;
(5) Sequentially inputting the insulation geometric data X-Y of the transformer and the environmental temperature data, and ensuring that the system can complete X-Y data modeling;
(6) Clicking a start test button to perform frequency response test, and recording a test result through a display screen and a printer after the test is finished.
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| CN108279284A (en) * | 2018-01-04 | 2018-07-13 | 国网辽宁省电力有限公司电力科学研究院 | A kind of transformer moisture tester |
| CN108593714B (en) * | 2018-04-12 | 2020-05-22 | 西安交通大学 | Transformer internal moisture measurement system based on dielectric response characteristics of transformer built-in oiled paper insulation sample |
| CN109188104A (en) * | 2018-10-12 | 2019-01-11 | 国网陕西省电力公司电力科学研究院 | The dielectric response of paper oil insulation casing not blackouts monitoring system and method |
| CN112067900A (en) * | 2020-08-31 | 2020-12-11 | 广东电网有限责任公司广州供电局 | PDC time-frequency domain conversion method and device |
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