CN114035124A - Handheld instrument for quality test of power transformer and method thereof - Google Patents
Handheld instrument for quality test of power transformer and method thereof Download PDFInfo
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- CN114035124A CN114035124A CN202111349313.4A CN202111349313A CN114035124A CN 114035124 A CN114035124 A CN 114035124A CN 202111349313 A CN202111349313 A CN 202111349313A CN 114035124 A CN114035124 A CN 114035124A
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- 238000012360 testing method Methods 0.000 title claims abstract description 525
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 230000003993 interaction Effects 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 39
- 238000013101 initial test Methods 0.000 claims description 24
- 238000009413 insulation Methods 0.000 claims description 23
- 238000003745 diagnosis Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000009191 jumping Effects 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 6
- 238000009666 routine test Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000006870 function Effects 0.000 abstract description 2
- 230000009897 systematic effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
A handheld instrument for the quality test of a power transformer and a method thereof are provided, a CPU controller is adopted to process and analyze field test data in real time, a display screen is controlled to carry out man-machine interaction, a camera is controlled to carry out the name plate information acquisition of the power transformer, and the method for the quality test of the power transformer is realized through the software programming of the CPU controller, so that the handheld instrument for the quality test of the power transformer and the method thereof are obtained, thereby replacing the manual handwriting mode of recording the test data on the field, reducing the calculation time and the error rate of manual conversion, realizing the electronic office and systematic management, leading the field to look up historical test data to be more convenient, having the functions of quality test judgment, alarm prompt and image acquisition, being more convenient for the test and detection of the state of the power transformer, being small and exquisite as a whole, being convenient to carry and being simple in operation, the test data is more clearly and completely stored, the transmission is convenient and fast, and the confidentiality is higher.
Description
Technical Field
The invention relates to the technical field of power transformer detection, in particular to a handheld instrument for a power transformer quality test and a method thereof.
Background
Along with the continuous progress of economic development, the power consumption demand is continuously increased, the requirement on power equipment is higher and higher, wherein a power transformer is an important part of the power equipment, an electrical test is an important means for detecting the state of the power transformer, the traditional electrical test is that a tester adopts a handwritten paper recording mode, the mode is in the current production operation field, the practicability is worse and worse, the recording time is longer and longer along with the increasing recorded test data quantity, the historical test data is more and more, the reliability of the handwritten paper recording mode is lower and more, the test data is more and more difficult to store, meanwhile, the test data recording is not standard enough, the time for manually processing and analyzing the test data is overlong, and the error rate is higher.
Disclosure of Invention
Aiming at the problems and technical requirements in the prior art, the invention provides a handheld instrument for the quality test of a power transformer and a method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power transformer quality test hand-held instrument and a method thereof are characterized in that the method of the power transformer quality test hand-held instrument comprises the following steps:
(S1) a tester inputs an account and a password on a display screen of the power transformer quality test handheld instrument for logging in;
(S2) after logging in, a tester inputs the serial number of the power transformer to be tested on a display screen of the power transformer quality test handheld instrument;
(S3) searching a history library in the power transformer quality test handheld instrument, checking whether the serial number of the power transformer to be tested exists, if so, jumping to the step (S4), and if not, jumping to the step (S5);
(S4) the tester checks whether the nameplate information of the power transformer to be tested is consistent with the nameplate information of the power transformer in the history library in the power transformer quality test handheld instrument, if so, the step is skipped to (S7), and if not, the step is skipped to (S6);
(S5) the tester creates the nameplate information of the power transformer to be tested through a power transformer nameplate information template in a history library in the power transformer quality test handheld instrument, photographs the nameplate of the power transformer to be tested, stores the nameplate of the power transformer to be tested into the history library in the power transformer quality test handheld instrument together, and jumps to the step (S4);
(S6) the tester calls out the power transformer nameplate information in the history library in the power transformer quality test handheld instrument, modifies the power transformer nameplate information in the history library in the power transformer quality test handheld instrument according to the power transformer nameplate information to be tested, takes a picture of the power transformer nameplate to be tested again, stores the pictures in the history library in the power transformer quality test handheld instrument together, and jumps to the step (S7);
(S7) the tester clicks and confirms on the display screen of the power transformer quality test hand-held instrument;
(S8) the power transformer quality test hand-held instrument records the testers and the time of clicking confirmation of the testers, and stores the time in the power transformer test report library management system.
The power transformer test report library management system in the step (S8) includes: the method comprises the steps of test report entering, inquiry statistics and test initial value management, wherein the test report entering comprises newly building a test report, modifying the test report and deleting the test report, the inquiry statistics comprises checking and exporting the test report, inquiring the historical trend of the test report and carrying out difference analysis on the test report, and the test initial value management comprises checking and modifying the routine initial value of the power transformer, handing-over the initial value and diagnosing the initial value.
The new test report comprises the following steps:
(S801) filling basic information of a test report by a tester, wherein the basic information comprises a transformer substation name, a test unit, a test team, a power transformer operation number, test properties, a test date, a tester, a test site, a report date, a compiling person, a reviewer, an approver, test weather, environment temperature, environment relative humidity and winding temperature, and the test properties comprise routine, handover and diagnosis;
(S802) the power transformer quality test handheld instrument generates a test report name according to the content in the step (S801);
(S803) selecting a test report template by a tester according to the nameplate information and the test properties of the power transformer to be tested, wherein the test report template comprises a double-winding transformer electrical routine test report template, a double-winding transformer electrical handover test report template, a double-winding transformer electrical diagnosis test report template, a three-winding transformer electrical routine test report template, a three-winding transformer electrical handover test report template and a three-winding transformer electrical diagnosis test report template;
(S804) selecting a test item in the test report by a tester, wherein the test item comprises a direct current resistance test item, a voltage ratio test item, an insulation resistance test item, a capacitance and dielectric loss test item and a short-circuit impedance test item;
(S805) the tester enters the test data, the current oil temperature and the name and the number of the current test instrument of the test item selected in the step (S804);
(S806) the power transformer quality test handheld instrument calls the test initial values of the test data recorded in the step (S805), wherein the test initial values comprise power transformer routine initial values, handover initial values and diagnosis initial values, the routine initial values are factory test data values, the handover initial values are factory test data values, and the diagnosis initial values are latest test data values;
(S807) converting the test initial value of the retrieved test data into a data conversion value of the test initial value of the test data under the current oil temperature according to a conversion formula by the power transformer quality test handheld instrument;
(S808) the power transformer quality test handheld instrument calculates a deviation value between a data conversion value of a test initial value of the test data at the current oil temperature in the step (S807) and the test data recorded in the step (S805);
(S809) the power transformer quality test hand-held instrument judges whether the deviation value in the step (S808) exceeds a test standard range, if so, the step (S812) is skipped, otherwise, the step (S810) is skipped;
(S810) the power transformer quality test handheld instrument obtains a qualified test data conclusion, and the step (S811) is skipped;
(S811) the handheld instrument for the quality test of the power transformer stores test data, and the step (S814) is skipped;
(S812) marking the test data recorded in the step (S805) corresponding to the deviation value exceeding the test standard range with red by the power transformer quality test handheld instrument to obtain a test data unqualified conclusion, and displaying the corresponding test initial value in the step (S806), the data conversion value of the test initial value at the current oil temperature in the step (S807), the deviation value in the step (S808) and the test standard range;
(S813) the tester confirms whether the test data of the input test item is wrong, if so, the test data of the test item is input again, and the step (S805) is skipped, otherwise, the step (S811) is skipped;
(S814) the tester confirms whether the test data of all test items are recorded completely, if so, the step is skipped (S815), and if not, the step is skipped (S804);
(S815) the power transformer quality test handheld instrument checks whether red marking test data exist, if yes, the step (S817) is skipped, and if not, the step (S816) is skipped;
(S816) the power transformer quality test handheld instrument obtains a qualified test report, and the step (S818) is skipped;
(S817) the power transformer quality test handheld instrument displays the position of the red marked test data to obtain a test report unqualified conclusion, and the step (S818) is skipped;
and (S818) the power transformer quality test handheld instrument generates a test report and stores the test report in the power transformer quality test handheld instrument and a power transformer test report management system.
The step (S807) of converting the formula and the step (S809) of testing the standard range:
the test data of the DC resistance test project comprises the current oil temperature T of the power transformer to be tested and the test data value R of each phase DC resistance of the power transformer to be tested under the current oil temperature TtR in initial test value management in called test report library management systemtCorresponding initial value R of testchu，RchuConverting to data conversion value R under current oil temperature Tz，
TchuIs RchuCorresponding to the test oil temperature, k is constant, the copper winding k is 235, the aluminum winding k is 225, RtMaximum value of Rmax，RtMinimum value of Rmin；
Test standard of test data of direct current resistance test projectThe quasi range is: 1.6MVA or less transformer, phase difference (R)max-Rmin)/RminLess than or equal to 0.04; transformer with less than 1.6MVA and no neutral point led out winding and line to line difference (R)max-Rmin)/RminLess than or equal to 0.02; 1.6MVA or above, phase difference (R)max-Rmin)/RminLess than or equal to 0.02; 1.6MVA transformer without neutral point led-out winding and line-to-line difference (R)max-Rmin)/RminLess than or equal to 0.01; r at the same temperaturetAnd RzDeviation value of (2): (R)z-Rt)/Rz≤0.02；
The test data of the voltage ratio test items comprise test data values k of the voltage ratios of all phases of the power transformer to be testedbAnd kbTest data value w of the error rate compared to the information of the nameplate of the power transformer to be testedb；
The test standard range of the test data of the voltage ratio test item is as follows: rated tap wbLess than or equal to plus or minus 0.5 percent; other tap wb≤±1％；
The test data of the insulation resistance test items comprise insulation resistance test data values, absorption ratio test data values and polarization index test data values with the test time of 15s, 60s and 600s under the current oil temperature T; insulation resistance test data value Rt·TThe conversion formula of (c) is: rt·20＝RtT×1.5(T-20)/10Wherein R ist·20At a standard oil temperature R of 20 DEG Ct·TIs converted into a data value of Rt·TThe insulation resistance test data value is T s (T is 15, 60 or 600s) at the test time of the current oil temperature T; absorption ratio test data value kmThe calculation formula of (2) is as follows:
the calculation formula of the polarization index test data value PI is as follows:
the test standard range of the test data of the insulation resistance test item is as follows: insulation resistance test data value R of winding60·20Not less than 10000M omega or kmNot less than 1.3 or PI not less than 1.5; insulation resistance test data value R of iron core60·T≥100MΩ；
The test data of the capacitance and dielectric loss test items comprise a test data value tan delta of the winding dielectric loss factor, a test data value C of the capacitance of the power transformer to be tested, and a test data value tan delta of the dielectric loss factor of each phase of bushingtTest data value C of the bushing capacitance of each phasetAnd the initial test value tan delta corresponding to tan delta in initial test value management in the called test report library management systemchuTan delta in initial value management of test in called test report library management systemtCorresponding initial value of the test tan deltachuThe initial test value C corresponding to the initial test value C in the initial test value management in the called test report library management systemchu(ii) a C in initial test value management in called test report library management systemtCorresponding initial test value Ctchu；
The test standard range of the test data of the capacitance and dielectric loss test items is as follows: tan delta is less than or equal to 1.3tan deltachu，C≤(1±0.03)Cchu；66kV：tanδt≤0.01，220kV：tanδt≤0.008，Ct≤(1±0.05)Ctchu；
The test data of the short-circuit impedance test project comprises short-circuit impedance test data values U of each phase of the power transformer to be testedkCalculating three phases UkAverage value of UaveI.e. by
Wherein U iskAIs a short-circuit impedance test data value, U, of the A phase of the power transformer to be testedkBIs a short-circuit impedance test data value, U, of the B phase of the power transformer to be testedkCCalculating three-phase U for short-circuit impedance test data value of C phase of power transformer to be testedkMutual difference value U ofzI.e. Uz＝Umax-UminWherein U ismaxIs UkMaximum value of (1), UminIs UkMinimum value of (1); rated short circuit impedance value U in called out power transformer nameplate information to be testedmp；
The test standard range of the test data of the short circuit impedance test item is as follows: a transformer with a capacity of 100MVA or less and a voltage level of 220kV or less, Uave≤(1±2％)Ump(ii) a Transformer with capacity over 100MVA or voltage over 220kV, Uave≤(1±1.6％)Ump(ii) a Transformer U with capacity of 100MVA or less and voltage class of 220kV or lessz≤(1±2.5％)Umin(ii) a The maximum relative difference between three phases of the transformer with the capacity of more than 100MVA or the voltage level of more than 220kV should not be more than Uz≤(1±2％)Umin。
The power transformer quality test handheld instrument comprises a CPU controller, a display screen, a memory, a USB interface, a camera and a battery; the CPU controller is connected with the display screen, the memory, the USB interface and the camera, analyzes and processes test data of the power transformer to be tested, generates a test report of the power transformer, and simultaneously transmits all the data to the memory for storage; the display screen is used for man-machine interaction and transmitting test data of the power transformer to be tested, which is input by a tester, to the CPU controller; the USB interface is connected with the battery and is used for charging the battery of the power transformer quality test handheld instrument and transmitting an external power transformer test report; the battery provides power for the power transformer quality test handheld instrument; the camera is used for treating the collection of examination power transformer data plate information.
Compared with the prior art, the invention has the beneficial effects that:
according to the handheld instrument and the method for the power transformer test, the CPU controller is used for processing and analyzing the field test data in real time, a manual handwriting mode of recording the test data on the field is replaced, the calculation time is shortened, the error rate of manual conversion is reduced, electronic office work and systematic management are realized, the field reference of historical test data is more convenient, meanwhile, the handheld instrument has the functions of quality test judgment, alarm prompt and image acquisition, the test and detection of the state of the power transformer are more convenient, the handheld instrument for the power transformer quality test is small and exquisite in whole, convenient to carry and simple to operate, the test data are more clearly and completely stored, the transmission is convenient, and the confidentiality is higher.
The above description is only an overview of the technical solutions of the present invention, and the specific implementation methods of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, features and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings, without limiting the invention thereto.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow chart of a new experimental report according to the present invention.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, a flow chart of a power transformer quality test handset and a method thereof, the method of the power transformer quality test handset includes the following steps:
(S1) a tester inputs an account and a password on a display screen of the power transformer quality test handheld instrument for logging in;
(S2) after logging in, a tester inputs the serial number of the power transformer to be tested on a display screen of the power transformer quality test handheld instrument;
(S3) searching a history library in the power transformer quality test handheld instrument, checking whether the serial number of the power transformer to be tested exists, if so, jumping to the step (S4), and if not, jumping to the step (S5);
(S4) the tester checks whether the nameplate information of the power transformer to be tested is consistent with the nameplate information of the power transformer in the history library in the power transformer quality test handheld instrument, if so, the step is skipped to (S7), and if not, the step is skipped to (S6);
(S5) the tester creates the nameplate information of the power transformer to be tested through a power transformer nameplate information template in a history library in the power transformer quality test handheld instrument, photographs the nameplate of the power transformer to be tested, stores the nameplate of the power transformer to be tested into the history library in the power transformer quality test handheld instrument together, and jumps to the step (S4);
(S6) the tester calls out the power transformer nameplate information in the history library in the power transformer quality test handheld instrument, modifies the power transformer nameplate information in the history library in the power transformer quality test handheld instrument according to the power transformer nameplate information to be tested, takes a picture of the power transformer nameplate to be tested again, stores the pictures in the history library in the power transformer quality test handheld instrument together, and jumps to the step (S7);
(S7) the tester clicks and confirms on the display screen of the power transformer quality test hand-held instrument;
(S8) the power transformer quality test hand-held instrument records the testers and the time of clicking confirmation of the testers, and stores the time in the power transformer test report library management system.
Wherein the power transformer test report library management system in the step (S8) includes: the method comprises the steps of test report entering, inquiry statistics and test initial value management, wherein the test report entering comprises newly building a test report, modifying the test report and deleting the test report, the inquiry statistics comprises checking and exporting the test report, inquiring the historical trend of the test report and carrying out difference analysis on the test report, and the test initial value management comprises checking and modifying the routine initial value of the power transformer, handing-over the initial value and diagnosing the initial value.
As shown in fig. 2, a flow chart of a new test report of a power transformer quality test hand-held instrument and a method thereof includes the following steps:
(S801) filling basic information of a test report by a tester, wherein the basic information comprises a transformer substation name, a test unit, a test team, a power transformer operation number, test properties, a test date, a tester, a test site, a report date, a compiling person, a reviewer, an approver, test weather, environment temperature, environment relative humidity and winding temperature, and the test properties comprise routine, handover and diagnosis;
(S802) the power transformer quality test handheld instrument generates a test report name according to the content in the step (S801);
(S803) selecting a test report template by a tester according to the nameplate information and the test properties of the power transformer to be tested, wherein the test report template comprises a double-winding transformer electrical routine test report template, a double-winding transformer electrical handover test report template, a double-winding transformer electrical diagnosis test report template, a three-winding transformer electrical routine test report template, a three-winding transformer electrical handover test report template and a three-winding transformer electrical diagnosis test report template;
(S804) selecting a test item in the test report by a tester, wherein the test item comprises a direct current resistance test item, a voltage ratio test item, an insulation resistance test item, a capacitance and dielectric loss test item and a short-circuit impedance test item;
(S805) the tester enters the test data, the current oil temperature and the name and the number of the current test instrument of the test item selected in the step (S804);
(S806) the power transformer quality test handheld instrument calls the test initial values of the test data recorded in the step (S805), wherein the test initial values comprise power transformer routine initial values, handover initial values and diagnosis initial values, the routine initial values are factory test data values, the handover initial values are factory test data values, and the diagnosis initial values are latest test data values;
(S807) converting the test initial value of the retrieved test data into a data conversion value of the test initial value of the test data under the current oil temperature according to a conversion formula by the power transformer quality test handheld instrument;
(S808) the power transformer quality test handheld instrument calculates a deviation value between a data conversion value of a test initial value of the test data at the current oil temperature in the step (S807) and the test data recorded in the step (S805);
(S809) the power transformer quality test hand-held instrument judges whether the deviation value in the step (S808) exceeds a test standard range, if so, the step (S812) is skipped, otherwise, the step (S810) is skipped;
(S810) the power transformer quality test handheld instrument obtains a qualified test data conclusion, and the step (S811) is skipped;
(S811) the handheld instrument for the quality test of the power transformer stores test data, and the step (S814) is skipped;
(S812) marking the test data recorded in the step (S805) corresponding to the deviation value exceeding the test standard range with red by the power transformer quality test handheld instrument to obtain a test data unqualified conclusion, and displaying the corresponding test initial value in the step (S806), the data conversion value of the test initial value at the current oil temperature in the step (S807), the deviation value in the step (S808) and the test standard range;
(S813) the tester confirms whether the test data of the input test item is wrong, if so, the test data of the test item is input again, and the step (S805) is skipped, otherwise, the step (S811) is skipped;
(S814) the tester confirms whether the test data of all test items are recorded completely, if so, the step is skipped (S815), and if not, the step is skipped (S804);
(S815) the power transformer quality test handheld instrument checks whether red marking test data exist, if yes, the step (S817) is skipped, and if not, the step (S816) is skipped;
(S816) the power transformer quality test handheld instrument obtains a qualified test report, and the step (S818) is skipped;
(S817) the power transformer quality test handheld instrument displays the position of the red marked test data to obtain a test report unqualified conclusion, and the step (S818) is skipped;
and (S818) the power transformer quality test handheld instrument generates a test report and stores the test report in the power transformer quality test handheld instrument and a power transformer test report management system.
Wherein, the step (S807) converts the formula and the step (S809) tests the standard range:
the test data of the DC resistance test project comprises the current oil temperature T of the power transformer to be tested and the test data value R of each phase DC resistance of the power transformer to be tested under the current oil temperature TtR in initial test value management in called test report library management systemtCorresponding initial value R of testchu，RchuConverting to data conversion value R under current oil temperature Tz，
TchuIs RchuCorresponding to the test oil temperature, k is constant, the copper winding k is 235, the aluminum winding k is 225, RtMaximum value of Rmax，RtMinimum value of Rmin；
The test standard range of the test data of the direct current resistance test item is as follows: 1.6MVA or less transformer, phase difference (R)max-Rmin)/RminLess than or equal to 0.04; transformer with less than 1.6MVA and no neutral point led out winding and line to line difference (R)max-Rmin)/RminLess than or equal to 0.02; 1.6MVA or above, phase difference (R)max-Rmin)/RminLess than or equal to 0.02; 1.6MVA transformer without neutral point led-out winding and line-to-line difference (R)max-Rmin)/RminLess than or equal to 0.01; r at the same temperaturetAnd RzDeviation value of (2): (R)z-Rt)/Rz≤0.02；
The test data of the voltage ratio test items comprise test data values k of the voltage ratios of all phases of the power transformer to be testedbAnd kbTest data value w of the error rate compared to the information of the nameplate of the power transformer to be testedb；
The test standard range of the test data of the voltage ratio test item is as follows: rated tap wbLess than or equal to plus or minus 0.5 percent; other tap wb≤±1％；
InsulationThe test data of the resistance test item comprise insulation resistance test data values, absorption ratio test data values and polarization index test data values with the test time of 15s, 60s and 600s under the current oil temperature T; insulation resistance test data value Rt·TThe conversion formula of (c) is: rt·20＝RtT×1.5(T-20)/10Wherein R ist·20At a standard oil temperature R of 20 DEG Ct·TIs converted into a data value of Rt·TThe insulation resistance test data value is T s (T is 15, 60 or 600s) at the test time of the current oil temperature T; absorption ratio test data value kmThe calculation formula of (2) is as follows:
the calculation formula of the polarization index test data value PI is as follows:
the test standard range of the test data of the insulation resistance test item is as follows: insulation resistance test data value R of winding60·20Not less than 10000M omega or kmNot less than 1.3 or PI not less than 1.5; insulation resistance test data value R of iron core60·T≥100MΩ；
The test data of the capacitance and dielectric loss test items comprise a test data value tan delta of the winding dielectric loss factor, a test data value C of the capacitance of the power transformer to be tested, and a test data value tan delta of the dielectric loss factor of each phase of bushingtTest data value C of the bushing capacitance of each phasetAnd the initial test value tan delta corresponding to tan delta in initial test value management in the called test report library management systemchuTan delta in initial value management of test in called test report library management systemtCorresponding initial value of the test tan deltachuThe initial test value C corresponding to the initial test value C in the initial test value management in the called test report library management systemchu(ii) a C in initial test value management in called test report library management systemtCorresponding initial test value Ctchu；
The test standard range of the test data of the capacitance and dielectric loss test items is as follows: tan delta is less than or equal to 1.3tan deltachu，C≤(1±0.03)Cchu；66kV：tanδt≤0.01，220kV：tanδt≤0.008，Ct≤(1±0.05)Ctchu；
The test data of the short-circuit impedance test project comprises short-circuit impedance test data values U of each phase of the power transformer to be testedkCalculating three phases UkAverage value of UaveI.e. by
Wherein U iskAIs a short-circuit impedance test data value, U, of the A phase of the power transformer to be testedkBIs a short-circuit impedance test data value, U, of the B phase of the power transformer to be testedkCCalculating three-phase U for short-circuit impedance test data value of C phase of power transformer to be testedkMutual difference value U ofzI.e. Uz＝Umax-UminWherein U ismaxIs UkMaximum value of (1), UminIs UkMinimum value of (1); rated short circuit impedance value U in called out power transformer nameplate information to be testedmp；
The test standard range of the test data of the short circuit impedance test item is as follows: a transformer with a capacity of 100MVA or less and a voltage level of 220kV or less, Uave≤(1±2％)Ump(ii) a Transformer with capacity over 100MVA or voltage over 220kV, Uave≤(1±1.6％)Ump(ii) a Transformer U with capacity of 100MVA or less and voltage class of 220kV or lessz≤(1±2.5％)Umin(ii) a The maximum relative difference between three phases of the transformer with the capacity of more than 100MVA or the voltage level of more than 220kV should not be more than Uz≤(1±2％)Umin。
The power transformer quality test hand-held instrument comprises a CPU controller, a display screen, a memory, a USB interface, a camera and a battery; the CPU controller is connected with the display screen, the memory, the USB interface and the camera, analyzes and processes test data of the power transformer to be tested, generates a test report of the power transformer, and simultaneously transmits all the data to the memory for storage; the display screen is used for man-machine interaction and transmitting test data of the power transformer to be tested, which is input by a tester, to the CPU controller; the USB interface is connected with the battery and is used for charging the battery of the power transformer quality test handheld instrument and transmitting an external power transformer test report; the battery provides power for the power transformer quality test handheld instrument; the camera is used for treating the collection of examination power transformer data plate information.
The technical features of the above examples can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above examples are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered as being described in the present specification.
The above examples merely represent embodiments of the invention, which are described in more detail and in greater detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and insubstantial modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (5)
1. A power transformer quality test hand-held instrument and a method thereof are characterized in that the method of the power transformer quality test hand-held instrument comprises the following steps:
(S1) a tester inputs an account and a password on a display screen of the power transformer quality test handheld instrument for logging in;
(S2) after logging in, a tester inputs the serial number of the power transformer to be tested on a display screen of the power transformer quality test handheld instrument;
(S3) searching a history library in the power transformer quality test handheld instrument, checking whether the serial number of the power transformer to be tested exists, if so, jumping to the step (S4), and if not, jumping to the step (S5);
(S4) the tester checks whether the nameplate information of the power transformer to be tested is consistent with the nameplate information of the power transformer in the history library in the power transformer quality test handheld instrument, if so, the step is skipped to (S7), and if not, the step is skipped to (S6);
(S5) the tester creates the nameplate information of the power transformer to be tested through a power transformer nameplate information template in a history library in the power transformer quality test handheld instrument, photographs the nameplate of the power transformer to be tested, stores the nameplate of the power transformer to be tested into the history library in the power transformer quality test handheld instrument together, and jumps to the step (S4);
(S6) the tester calls out the power transformer nameplate information in the history library in the power transformer quality test handheld instrument, modifies the power transformer nameplate information in the history library in the power transformer quality test handheld instrument according to the power transformer nameplate information to be tested, takes a picture of the power transformer nameplate to be tested again, stores the pictures in the history library in the power transformer quality test handheld instrument together, and jumps to the step (S7);
(S7) the tester clicks and confirms on the display screen of the power transformer quality test hand-held instrument;
(S8) the power transformer quality test hand-held instrument records the testers and the time of clicking confirmation of the testers, and stores the time in the power transformer test report library management system.
2. The method of claim 1, wherein said step (S8) of power transformer test report library management system comprises: the method comprises the steps of test report entering, inquiry statistics and test initial value management, wherein the test report entering comprises newly building a test report, modifying the test report and deleting the test report, the inquiry statistics comprises checking and exporting the test report, inquiring the historical trend of the test report and carrying out difference analysis on the test report, and the test initial value management comprises checking and modifying the routine initial value of the power transformer, handing-over the initial value and diagnosing the initial value.
3. The method of claim 2, wherein the step of creating a test report comprises the steps of:
(S801) filling basic information of a test report by a tester, wherein the basic information comprises a transformer substation name, a test unit, a test team, a power transformer operation number, test properties, a test date, a tester, a test site, a report date, a compiling person, a reviewer, an approver, test weather, environment temperature, environment relative humidity and winding temperature, and the test properties comprise routine, handover and diagnosis;
(S802) the power transformer quality test handheld instrument generates a test report name according to the content in the step (S801);
(S803) selecting a test report template by a tester according to the nameplate information and the test properties of the power transformer to be tested, wherein the test report template comprises a double-winding transformer electrical routine test report template, a double-winding transformer electrical handover test report template, a double-winding transformer electrical diagnosis test report template, a three-winding transformer electrical routine test report template, a three-winding transformer electrical handover test report template and a three-winding transformer electrical diagnosis test report template;
(S804) selecting a test item in the test report by a tester, wherein the test item comprises a direct current resistance test item, a voltage ratio test item, an insulation resistance test item, a capacitance and dielectric loss test item and a short-circuit impedance test item;
(S805) the tester enters the test data, the current oil temperature and the name and the number of the current test instrument of the test item selected in the step (S804);
(S806) the power transformer quality test handheld instrument calls the test initial values of the test data recorded in the step (S805), wherein the test initial values comprise power transformer routine initial values, handover initial values and diagnosis initial values, the routine initial values are factory test data values, the handover initial values are factory test data values, and the diagnosis initial values are latest test data values;
(S807) converting the test initial value of the retrieved test data into a data conversion value of the test initial value of the test data under the current oil temperature according to a conversion formula by the power transformer quality test handheld instrument;
(S808) the power transformer quality test handheld instrument calculates a deviation value between a data conversion value of a test initial value of the test data at the current oil temperature in the step (S807) and the test data recorded in the step (S805);
(S809) the power transformer quality test hand-held instrument judges whether the deviation value in the step (S808) exceeds a test standard range, if so, the step (S812) is skipped, otherwise, the step (S810) is skipped;
(S810) the power transformer quality test handheld instrument obtains a qualified test data conclusion, and the step (S811) is skipped;
(S811) the handheld instrument for the quality test of the power transformer stores test data, and the step (S814) is skipped;
(S812) marking the test data recorded in the step (S805) corresponding to the deviation value exceeding the test standard range with red by the power transformer quality test handheld instrument to obtain a test data unqualified conclusion, and displaying the corresponding test initial value in the step (S806), the data conversion value of the test initial value at the current oil temperature in the step (S807), the deviation value in the step (S808) and the test standard range;
(S813) the tester confirms whether the test data of the input test item is wrong, if so, the test data of the test item is input again, and the step (S805) is skipped, otherwise, the step (S811) is skipped;
(S814) the tester confirms whether the test data of all test items are recorded completely, if so, the step is skipped (S815), and if not, the step is skipped (S804);
(S815) the power transformer quality test handheld instrument checks whether red marking test data exist, if yes, the step (S817) is skipped, and if not, the step (S816) is skipped;
(S816) the power transformer quality test handheld instrument obtains a qualified test report, and the step (S818) is skipped;
(S817) the power transformer quality test handheld instrument displays the position of the red marked test data to obtain a test report unqualified conclusion, and the step (S818) is skipped;
and (S818) the power transformer quality test handheld instrument generates a test report and stores the test report in the power transformer quality test handheld instrument and a power transformer test report management system.
4. The method of claim 3, wherein the step (S807) of scaling the formula and the step (S809) of testing the standard range are as follows:
the test data of the DC resistance test project comprises the current oil temperature T of the power transformer to be tested and the test data value R of each phase DC resistance of the power transformer to be tested under the current oil temperature TtR in initial test value management in called test report library management systemtCorresponding initial value R of testchu，RchuConverting to data conversion value R under current oil temperature Tz，
TchuIs RchuCorresponding to the test oil temperature, k is constant, the copper winding k is 235, the aluminum winding k is 225, RtMaximum value of Rmax，RtMinimum value of Rmin；
The test standard range of the test data of the direct current resistance test item is as follows: 1.6MVA or less transformer, phase difference (R)max-Rmin)/RminLess than or equal to 0.04; transformer with less than 1.6MVA and no neutral point led out winding and line to line difference (R)max-Rmin)/RminLess than or equal to 0.02; 1.6MVA or above, phase difference (R)max-Rmin)/RminLess than or equal to 0.02; 1.6MVA transformer without neutral point led-out winding and line-to-line difference (R)max-Rmin)/RminLess than or equal to 0.01; r at the same temperaturetAnd RzDeviation value of (2): (R)z-Rt)/Rz≤0.02；
The test data of the voltage ratio test items comprise test data values k of the voltage ratios of all phases of the power transformer to be testedbAnd kbTest data value w of the error rate compared to the information of the nameplate of the power transformer to be testedb；
The test standard range of the test data of the voltage ratio test item is as follows: rated tap wbLess than or equal to plus or minus 0.5 percent; other tap wb≤±1％；
The test data of the insulation resistance test items comprise insulation resistance test data values and absorption ratio tests with test time of 15s, 60s and 600s under the current oil temperature TData values and polarization index test data values; insulation resistance test data value Rt·TThe conversion formula of (c) is: rt·20＝RtT×1.5(T-20)/10Wherein R ist·20At a standard oil temperature R of 20 DEG Ct·TIs converted into a data value of Rt·TThe insulation resistance test data value with the test time ts (T is 15, 60 or 600s) under the current oil temperature T is obtained; absorption ratio test data value kmThe calculation formula of (2) is as follows:
the calculation formula of the polarization index test data value PI is as follows:
the test standard range of the test data of the insulation resistance test item is as follows: insulation resistance test data value R of winding60·20Not less than 10000M omega or kmNot less than 1.3 or PI not less than 1.5; insulation resistance test data value R of iron core60·T≥100MΩ；
The test data of the capacitance and dielectric loss test items comprise a test data value tan delta of the winding dielectric loss factor, a test data value C of the capacitance of the power transformer to be tested, and a test data value tan delta of the dielectric loss factor of each phase of bushingtTest data value C of the bushing capacitance of each phasetAnd the initial test value tan delta corresponding to tan delta in initial test value management in the called test report library management systemchuTan delta in initial value management of test in called test report library management systemtCorresponding initial value of the test tan deltachuThe initial test value C corresponding to the initial test value C in the initial test value management in the called test report library management systemchu(ii) a C in initial test value management in called test report library management systemtCorresponding initial test value Ctchu；
The test standard range of the test data of the capacitance and dielectric loss test items is as follows: tan delta is less than or equal to 1.3tan deltachu，C≤(1±0.03)Cchu；66kV：tanδt≤0.01，220kV：tanδt≤0.008，Ct≤(1±0.05)Ctchu；
The test data of the short-circuit impedance test project comprises short-circuit impedance test data values U of each phase of the power transformer to be testedkCalculating three phases UkAverage value of UaveI.e. by
Wherein U iskAIs a short-circuit impedance test data value, U, of the A phase of the power transformer to be testedkBIs a short-circuit impedance test data value, U, of the B phase of the power transformer to be testedkCCalculating three-phase U for short-circuit impedance test data value of C phase of power transformer to be testedkMutual difference value U ofzI.e. Uz＝Umax-UminWherein U ismaxIs UkMaximum value of (1), UminIs UkMinimum value of (1); rated short circuit impedance value U in called out power transformer nameplate information to be testedmp；
The test standard range of the test data of the short circuit impedance test item is as follows: a transformer with a capacity of 100MVA or less and a voltage level of 220kV or less, Uave≤(1±2％)Ump(ii) a Transformer with capacity over 100MVA or voltage over 220kV, Uave≤(1±1.6％)Ump(ii) a Transformer U with capacity of 100MVA or less and voltage class of 220kV or lessz≤(1±2.5％)Umin(ii) a The maximum relative difference between three phases of the transformer with the capacity of more than 100MVA or the voltage level of more than 220kV should not be more than Uz≤(1±2％)Umin。
5. The power transformer quality test hand-held instrument and the method thereof according to claim 1 is characterized in that the power transformer quality test hand-held instrument comprises a CPU controller, a display screen, a memory, a USB interface, a camera and a battery; the CPU controller is connected with the display screen, the memory, the USB interface and the camera, analyzes and processes test data of the power transformer to be tested, generates a test report of the power transformer, and simultaneously transmits all the data to the memory for storage; the display screen is used for man-machine interaction and transmitting test data of the power transformer to be tested, which is input by a tester, to the CPU controller; the USB interface is connected with the battery and is used for charging the battery of the power transformer quality test handheld instrument and transmitting an external power transformer test report; the battery provides power for the power transformer quality test handheld instrument; the camera is used for treating the collection of examination power transformer data plate information.
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