CN107632182B - AC generator stator bar strand current testing system and method for measuring strand current - Google Patents
AC generator stator bar strand current testing system and method for measuring strand current Download PDFInfo
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- CN107632182B CN107632182B CN201710886612.9A CN201710886612A CN107632182B CN 107632182 B CN107632182 B CN 107632182B CN 201710886612 A CN201710886612 A CN 201710886612A CN 107632182 B CN107632182 B CN 107632182B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses a system and a method for testing strand current of a stator bar of an alternating-current generator, wherein the system comprises a power supply platform, a stator bar testing platform and a stator bar strand current testing platform, the power supply platform comprises two power supply devices, each power supply device comprises an alternating-current adjustable power supply and a single-phase step-down transformer, the stator bar testing platform comprises an iron core with a groove and two stator bars, the iron core consists of a plurality of iron core sections which are distributed at equal intervals, two stator bars which are distributed up and down are placed in the groove, the stator bar strand current testing platform comprises a magnetic field collector and a signal conversion module, the magnetic field collector is communicated with an upper computer through the signal conversion module, the magnetic field collector comprises a plurality of PCB (printed Circuit Board) for measurement, and all the PCB (printed Circuit Board) for measurement are fixed into a whole at equal intervals through connecting pieces and are arranged on two sides of the end parts of each stator bar. The scheme realizes the current measurement of the stator bar strand on the basis of not damaging the end structure of the stator bar.
Description
Technical Field
The invention relates to the field of detection of generator stator bars, in particular to a strand current testing system of an alternating-current generator stator bar and a strand current measuring method.
Background
The stator bar of the large-sized alternating current generator is connected by a butt joint sleeve at the nose after being wound by a plurality of flat copper strands, and in addition, in order to increase the firmness of the stator bar of the large-sized alternating current generator, the strands of the stator bar are tightly connected together in a squeezing and gelling mode, so that no gaps exist between the strands.
Because the positions of each flat copper strand wire of the stator bar are different at the end part and the groove part, the interlinked leakage magnetic fluxes are different, so that the leakage magnetic induction electromotive forces generated by each flat copper strand wire are different, and further, circulating current and circulating current loss are generated among the strand wires, and finally, uneven temperature distribution of each strand wire is caused, and the safe operation of a large-sized alternating current generator is seriously influenced. In order to reduce the circulation loss of the stator winding and improve the temperature distribution of the strands, the strands of the stator bar of the alternating-current generator are woven and transposed in a transposition mode, and the positions of the strands of the stator bar at the end parts or the groove parts are changed.
In order to measure the inhibiting effect of the transposition mode on the circulating current, the method has important significance in measuring the transposition strand current of the stator winding of the alternating current generator, and the existing electromagnetic current transformer, the Hall current transformer, the Rogowski coil current transformer and other sensors cannot be buried among the strands of the stator bar.
At present, in order to facilitate the measurement of the strand current of a stator bar, strands at the end of the stator bar are opened so as to form a certain gap between each strand, and then a current transformer is embedded to measure the strand current of each stator bar.
Disclosure of Invention
In order to overcome the defects in the prior art, the system for testing the strand current of the stator bar of the alternating-current generator and the method for measuring the strand current can realize the measurement of the strand current without damaging the end structure of a stator line segment.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, a system for testing strand current of a stator bar of an alternator is provided, including a power supply platform, a stator bar testing platform and a stator bar strand current testing platform, wherein the power supply platform includes two power supply devices, the stator bar testing platform includes an iron core with a groove and two stator bars, the two stator bars are arranged in the groove of the iron core in a manner of being arranged up and down, and two ends of each stator bar are connected with one power supply device;
the stator bar strand current testing platform comprises magnetic field collectors and signal conversion modules, wherein two sides of the same position of any end part of each stator bar are provided with one magnetic field collector, the two magnetic field collectors are communicated with an upper computer through the signal conversion modules, each magnetic field collector comprises a plurality of PCB (printed Circuit Board) boards for measurement, all the PCB boards for measurement are fixed into a whole at equal intervals through connecting pieces, and a Hall element is arranged at the edge of the board surface of each PCB board for measurement.
Further, the magnetic field collectors are perpendicular to the height direction of the end part of the stator bar where the magnetic field collectors are located, the number of PCB (printed Circuit Board) for measurement of each magnetic field collector is half of the number of strands of the stator bar, and the measurement positions of all Hall elements of each magnetic field collector are close to the stator bar where the magnetic field collectors are located.
Further, a capacitor element connected with the Hall element is arranged at the welding position of the Hall element.
Further, a nylon gasket is arranged between the adjacent measurement PCBs, positioning holes are formed in the measurement PCBs at the positions where the nylon gaskets are located, and all the measurement PCBs are matched and fixed with the connecting piece into a whole through the positioning holes.
Further, the connecting piece comprises a nylon screw and a nylon nut matched with the nylon screw.
Further, each power supply device comprises an alternating current adjustable power supply and single-phase step-down transformers which are connected with each other, each single-phase step-down transformer is connected with two ends of one stator bar, a current transformer is arranged on a line connected with the end parts of the same side of the two single-phase step-down transformers and the two stator bars, and the two current transformers are connected with the same multifunctional instrument.
Further, the iron core is composed of a plurality of iron core sections which are distributed at equal intervals and provided with grooves, and gaps between adjacent iron core sections form ventilation grooves.
Further, the stator bar strand current testing platform also comprises a signal amplifying circuit, and the magnetic field collector is connected with the signal conversion module through the signal amplifying circuit.
In a second aspect, there is provided a method of measuring strand current by an alternator stator bar strand current testing system, comprising:
the magnetic field collectors are arranged on two sides of the end part of each stator bar, and the measuring position of each Hall element at the end part of each stator bar is recorded;
adjusting the voltage amplitude and the voltage phase of the power supply device until the current amplitude and the frequency on the two stator bars are equal;
when the two stator bars are in-phase slots or out-of-phase slots, acquiring the voltage output by each Hall element;
calculating the magnetic field intensity of the Hall element at the measuring position:
wherein B is the magnetic field intensity of the Hall element at the measuring position; u (U) H A voltage output for the hall element; k (k) H Is the sensitivity coefficient of the hall element.
Calculating the strand current of each strand of each stator bar by adopting a correlation equation of the constructed strand current of the stator bar and magnetic fields at different positions of the end part of the stator bar:
wherein I is 1 ～I 2n The current of the 1 st to 2n th strands; b (B) 1 ～B 2n The magnetic field intensity measured by the 1 st to 2n th Hall elements at the end part of the stator bar is respectively; k (k) (1,1) ～k (2n,2n) The magnetic field intensity measured by each Hall element and the current proportionality coefficient of each strand are respectively; 2n is the number of strands of two stator bars.
Further, when the current amplitude and the frequency on the two stator bars are equal and the phase difference of the two stator bars is 0 DEG, the two stator bars are in-phase slots; when the current amplitude and the frequency on the two stator bars are equal and the phase difference of the two stator bars is 30 degrees, the two stator bars are out-of-phase grooves.
Compared with the prior art, the invention has the beneficial effects that:
according to the scheme, the magnetic field collectors are directly arranged on two sides of the end part of the stator bar in the strand current measurement process, the magnetic fields at different positions of the end part of the stator bar can be collected by the Hall elements of the magnetic field collectors under the condition that the end part structure of the stator bar is not damaged, and then each strand current is obtained through the established correlation equation of each strand current of the stator bar and the magnetic fields at different positions of the end part of the stator bar.
The method realizes accurate measurement of the strand current of the same-phase groove and the different-phase groove of the stator bar, is beneficial to the circulation detection of the stator bar of the large-scale alternating current generator, and can evaluate the quality of the stator bar transposition method.
Because the magnetic field collector of this scheme is by equidistant equipment of a plurality of measurement with PCB board, convenient equipment and dismantlement, conveniently measure the magnetic field of stator bar tip different positions, be favorable to constructing the correlation equation of each strand electric current of stator bar and the magnetic field of stator bar tip different positions, finally be convenient for the calculation in stator bar homophase groove and outphasing groove strand electric current.
Drawings
Fig. 1 is a simplified schematic block diagram of an alternator stator bar strand current testing system.
Fig. 2 is a detailed schematic block diagram of an alternator stator bar strand current testing system.
Fig. 3 and 4 are schematic views of the structure and installation position of the magnetic field collector, respectively.
Fig. 5 is a schematic structural view of a PCB board for measurement after soldering a hall element and a capacitor element.
Fig. 6 is a flow chart of a method of measuring strand current by an alternator stator bar strand current testing system.
1, a power supply platform; 11. an ac adjustable power supply; 12. a single-phase step-down transformer; 13. a current transformer; 14. a multifunctional instrument; 2. a stator bar test platform; 21. a stator bar; 211. a single strand section; 22. a core; 221. a core segment; 222. a ventilation trench; 3. a stator bar strand current testing platform; 31. a magnetic field collector; 311. a PCB board for measurement; 3111. a Hall element; 3112. a capacitive element; 3113. positioning holes; 312. nylon screws; 313. a nylon gasket; 314. a nylon nut; 32. a signal amplifying circuit; 33. a signal conversion circuit; 34. and an upper computer.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, the alternator stator bar strand current testing system includes a power supply platform 1, a stator bar testing platform 2, and a stator bar strand current testing platform 3.
As shown in fig. 2, the power supply platform 1 includes two power supply devices, each of which includes an ac adjustable power supply 11 and a single-phase step-down transformer 12, and the two power supply devices can supply currents with the same amplitude and frequency but different phases to the two stator bars 21 independently, respectively, the stator bar test platform 2 includes an iron core 22 with a groove and two stator bars 21, two stator bars 21 arranged up and down are placed in the groove of the iron core 22, and two ends of each stator bar 21 are connected with the single-phase step-down transformer 12 in one power supply device.
When the method is implemented, the two stator bars preferably adopted in the scheme are twisted and transposed by the groove part strands, the end strands are not twisted and transposed, and after the method is adopted, the construction difficulty of correlation equations of the currents of the strands of the stator bars and magnetic fields at different positions of the ends of the stator bars can be reduced, and the quick calculation of the currents of the strands is facilitated.
In implementation, the two ac adjustable power supplies 11 of the scheme are all high-performance programmable ac/dc power supplies of CSW series of california instruments, the two single-phase step-down transformers 12 are all BK-7000VA, the two single-phase step-down transformers 12 are respectively connected with two ends of the two stator bars 21, a current transformer 13 is arranged on a line connecting the two single-phase step-down transformers 12 with the same side end parts of the two stator bars 21, the two current transformers 13 are all connected with the same multifunctional instrument 14, and the current transformer 13 and the multifunctional instrument 14 adopt an integrated ETCR4700 three-phase volt-ampere meter.
The two current transformers 13 are respectively used for measuring the current amplitude, the frequency and the phase of the two stator bars 21, the multifunctional instrument 14 is used for displaying and monitoring the current amplitude, the frequency and the phase of the two stator bars 21 respectively measured by the two current transformers 13, and the two current transformers 13 are combined with the two power supply devices to realize strand current measurement of the same-phase slots and the different-phase slots of the two stator bars 21.
As shown in fig. 2, the stator bar strand current testing platform 3 includes a magnetic field collector 31 and a signal conversion module 33, the magnetic field collector 31 communicates with an external host computer 34 through the signal conversion module 33, the magnetic field collector 31 is used for measuring magnetic fields at different positions at the end of the stator bar 21, and the signal conversion module adopts a PCI1255 data acquisition card in implementation.
As shown in fig. 3, the magnetic field collectors 31 include a plurality of measurement PCBs 311, all measurement PCBs 311 are fixed in a whole at equal intervals by connecting pieces, the number of measurement PCBs 311 of each magnetic field collector 31 is half of the number of strands of the stator bar 21, and a hall element 3111 is provided at the edge of the board surface of the measurement PCBs 311.
As shown in fig. 4, two sides of the same position at any end of each stator bar 21 are fixed with one magnetic field collector 31, the measurement positions of all hall elements 3111 of each magnetic field collector 31 are close to the stator bar 21 where they are located, and the single strand section 211 is the end strand section of the stator bar 21.
After the magnetic field collector 31 adopts the structure, the collection of the magnetic field at the position where the magnetic field collector is positioned can be realized without damaging the strand structure at the end part of the stator bar 21, and the arrangement of the position of the Hall element 3111 can lead the Hall element 3111 to be more adjacent to the strands of the stator bar 21, so that the magnetic field signal collected by the Hall element 3111 is ensured to be stronger.
In one embodiment of the present invention, a nylon spacer 313 is disposed between adjacent measurement PCBs 311, positioning holes 3113 are formed on the measurement PCBs 311 at the positions where the nylon spacers 313 are located, and all measurement PCBs 311 are integrally fixed by being matched with the connectors at the positioning holes 3113. The connector includes a nylon screw 312 and a nylon nut 314 mated with the nylon screw 312.
As shown in fig. 2, the magnetic field collector 31 is fixed at the end of the stator bar 21 and is perpendicular to the height direction of the end of the stator bar 21, and the welding positions of all the hall elements 3111 are adjacent to the stator bar 21, so that on one hand, the magnetic fields at different positions of the end of the stator bar can be conveniently measured, and on the other hand, the correlation equation between the currents of each strand of the stator bar and the magnetic fields at different positions of the end of the stator bar can be conveniently established.
As shown in fig. 5, a capacitor 3112 is further provided at the soldering position of the hall element 3111, and the capacitor 3112 can ensure stable supply voltage of the hall element 3111. In implementation, the hall element 3111 selected in this embodiment adopts a patch type a1324, the power supply voltage is 5V, and the capacitor element 3112 adopts a 0604 packaged patch capacitor.
As shown in fig. 2, when the method is implemented, the core 22 with grooves selected in the method is composed of a plurality of core segments 221 which are arranged at equal intervals and are provided with grooves, gaps between adjacent core segments 221 form ventilation grooves 222, and the width of the ventilation grooves 222 is 6mm.
By adopting the structure, the iron core 22 can simulate the ventilation ditch in the large-sized alternating current generator well, so that the error in strand current measurement can be reduced as much as possible, and the infinite approach to simulate the stator iron core structure of the large-sized alternating current generator can be achieved. In addition, the ventilation grooves 222 can also facilitate the rapid dissipation of heat in the stator bar, so as to avoid the influence of the increase of the resistance of the stator bar on the accuracy of final strand current measurement.
As shown in fig. 2, the stator bar strand current testing platform 3 further includes a signal amplifying circuit 32, the magnetic field collector 31 is connected to the signal conversion module 33 through the signal amplifying circuit 32, the signal amplifying circuit 32 is configured to amplify the voltage collected by the hall element 3111 and eliminate the static output voltage, and then the signal conversion module 33 is configured to convert the amplified multiple voltage signals (the voltage signals collected by the hall elements 3111) into digital signals, and store the digital signals in the upper computer 34.
The upper computer 34 obtains the magnetic field intensity of the position of the Hall element 3111 through the output voltage of the Hall element 3111 and the sensitivity coefficient thereof, and then obtains the current of each strand by adopting the obtained magnetic field intensity and the correlation equation of the current of each strand of the constructed stator bar 21 and the magnetic field of the different positions of the end part of the stator bar 21.
Referring to fig. 6, fig. 6 shows a flow chart of a method of measuring strand current by an alternator stator bar strand current testing system; as shown in fig. 6, the method 600 includes steps 601 to 605.
In step 601, the magnetic field collectors 31 are mounted on both sides of the end of each stator bar 21, and the measurement positions of the hall elements 3111 at the ends of the stator bars 21 are recorded, and when the magnetic field collectors 31 are mounted, the magnetic field collectors 31 are required to be fixed vertically along the height direction of the ends of the stator bars 21, and the positions of all the hall elements 3111 are close to the measured stator bars 21, so as to measure a large magnetic field.
In step 602, the voltage amplitude and the voltage phase of the power supply device are adjusted until the current amplitude and the frequency on the two stator bars 21 are equal, and the output voltage amplitude and the voltage phase of the ac adjustable power supply 11 in the two sets of power supply devices are recorded.
In step 603, when the two stator bars 21 are in-phase slots or out-of-phase slots, the voltage output from each hall element 3111 is acquired; when the current amplitude and the frequency on the two stator bars 21 are equal and the phase difference of the two stator bars 21 is 0 DEG, the two stator bars are in-phase slots; the phase difference between the two stator bars 21 is 30 ° when the current amplitude and frequency on the two stator bars 21 are equal.
In step 604, the magnetic field strength at the measurement position where the hall element 3111 is located is calculated:
wherein B is the magnetic field intensity of the Hall element at the measuring position; u (U) H Outputting a voltage for the hall element; k (k) H Is the sensitivity coefficient of the hall element.
In step 605, the strand currents of each strand of the two stator bars 21 are calculated using the correlation equation of the constructed strand currents of the stator bars 21 and the magnetic fields at different positions at the ends of the stator bars 21:
wherein I is 1 ～I 2n The current of the 1 st to 2n th strands; b (B) 1 ～B 2n The magnetic field strengths measured at the end portions of the stator bars 21 by the 1 st to 2 n-th hall elements 3111, respectively; k (k) (1,1) ～k (2n,2n) The magnetic field of the measurement position of the Hall element 3111 and the proportional coefficient of the current of each strand; k (k) (1,1) ～k (1,2n) A ratio of the magnetic field at the measurement position of the first hall element 3111 to the 1 st to 2n nd strand currents; k (k) (1,1) ～k (2n,1) Is the ratio of the magnetic field of the measurement position where the 1 st to 2 n-th hall element 3111 is located to the first strand current; n is the number of strands of the two stator bars 21.
The magnetic field obtained through the measurement of the Hall element 3111 is combined with the correlation equation of the built magnetic fields at different positions of the current of each strand of the stator bar 21 and the end part of the stator bar 21, and the strand current of each strand of the two stator bars 21 can be accurately measured under the condition that the end part structure of the stator bar 21 is not damaged.
Claims (9)
1. The alternating-current generator stator bar strand current testing system comprises a power supply platform, a stator bar testing platform and a stator bar strand current testing platform, and is characterized in that the power supply platform comprises two power supply devices, the stator bar testing platform comprises an iron core with a groove and two stator bars, the two stator bars are arranged in the groove of the iron core in an up-down arrangement mode, and two ends of each stator bar are connected with one power supply device;
the stator bar strand current testing platform comprises magnetic field collectors and signal conversion modules, wherein one magnetic field collector is arranged on two sides of the same position of any end part of each stator bar, the two magnetic field collectors are communicated with an upper computer through the signal conversion modules, each magnetic field collector comprises a plurality of identical PCB boards for measurement, all the PCB boards for measurement are fixed into a whole at equal intervals through connecting pieces, and a Hall element is arranged at the edge of the board surface of each PCB board for measurement;
the magnetic field collectors are perpendicular to the height direction of the end part of the stator bar where the magnetic field collectors are located, the number of PCB (printed Circuit Board) for measurement of each magnetic field collector is half of the number of strands of the stator bar, and the measurement positions of all Hall elements of each magnetic field collector are close to the stator bar where the magnetic field collectors are located.
2. The alternator stator bar strand current testing system of claim 1, wherein said hall element is further provided with a capacitive element connected thereto at a weld location.
3. The alternating-current generator stator bar strand current testing system according to claim 1, wherein nylon gaskets are arranged between adjacent measuring PCB boards, positioning holes are formed in the measuring PCB boards at the positions where the nylon gaskets are located, and all the measuring PCB boards are matched and fixed with the connecting piece into a whole through the positioning holes.
4. The alternator stator bar strand current testing system of claim 2 or 3, wherein said connector comprises a nylon screw and a nylon nut mated with the nylon screw.
5. The system of claim 1, wherein each power supply device comprises an ac adjustable power supply and single-phase step-down transformers which are connected with each other, each single-phase step-down transformer is connected with two ends of one stator bar, one current transformer is arranged on a line connected with the same side end of the two single-phase step-down transformers and the two stator bars, and the two current transformers are connected with the same multifunctional instrument.
6. The alternator stator bar strand current testing system of claim 1, wherein the core is comprised of a plurality of equally spaced core segments having grooves, the gaps between adjacent core segments forming ventilation channels.
7. The alternator stator bar strand current testing system of claim 1, wherein the stator bar strand current testing platform further comprises a signal amplification circuit, the magnetic field collector being coupled to the signal conversion module through the signal amplification circuit.
8. A method of measuring strand current using the alternator stator bar strand current testing system of any of claims 1-7, comprising:
the magnetic field collectors are arranged on two sides of the end part of each stator bar, and the measuring position of each Hall element at the end part of each stator bar is recorded;
adjusting the voltage amplitude and the voltage phase of the power supply device until the current amplitude and the frequency on the two stator bars are equal;
when the two stator bars are in-phase slots or out-of-phase slots, acquiring the voltage output by each Hall element;
calculating the magnetic field intensity of the Hall element at the measuring position:
wherein B is the magnetic field intensity of the Hall element at the measuring position; u (U) H A voltage output for the hall element; k (k) H The sensitivity coefficient of the Hall element;
calculating the strand current of each strand of each stator bar by adopting a correlation equation of the constructed strand currents of the stator bar and magnetic fields at different positions of the end parts of the stator bar:
wherein I is 1 ～I 2n The current of the 1 st to 2n th strands; b (B) 1 ～B 2n Magnetic field intensity k measured at end of stator bar for 1 st to 2n th Hall element (1,1) ～k (2n,2n) The magnetic field intensity measured by each Hall element and the current proportionality coefficient of each strand are respectively; 2n is the number of strands of two stator bars.
9. The method of measuring strand current of claim 8, wherein the two stator bars are in-phase slots when the current amplitudes and frequencies on the two stator bars are equal and the phase difference of the two stator bars is 0 °; when the current amplitude and the frequency on the two stator bars are equal and the phase difference of the two stator bars is 30 degrees, the two stator bars are out-of-phase grooves.
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| CN103267948A (en) * | 2013-05-02 | 2013-08-28 | 哈尔滨电机厂有限责任公司 | Method for testing alternating-current impedance of stator coil bar |
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| DE102007028965A1 (en) * | 2007-06-23 | 2008-12-24 | Leoni Bordnetz-Systeme Gmbh | Method for checking the current flow through individual wires of a stranded wire and apparatus for carrying out the method |
| CN204129137U (en) * | 2014-09-25 | 2015-01-28 | 云南电网公司电力科学研究院 | A kind of electric power dry reactor strand distribution of current analog testing platform |
| CN105021989B (en) * | 2015-07-20 | 2018-01-09 | 哈尔滨理工大学 | Circulation loss test system and the measuring method realized using the system between generator stator bar strand |
| CN207215891U (en) * | 2017-09-27 | 2018-04-10 | 哈尔滨理工大学 | Alternator frame bar strand current detecting system |
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