CN207215891U - Alternator frame bar strand current detecting system - Google Patents
Alternator frame bar strand current detecting system Download PDFInfo
- Publication number
- CN207215891U CN207215891U CN201721253377.3U CN201721253377U CN207215891U CN 207215891 U CN207215891 U CN 207215891U CN 201721253377 U CN201721253377 U CN 201721253377U CN 207215891 U CN207215891 U CN 207215891U
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- stator bar
- magnetic field
- stator
- strand
- detecting system
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Abstract
The utility model discloses a kind of alternator frame bar strand current detecting system,The system includes power supply platform,Stator bar test platform and stator bar strand testing current platform,Power supply platform includes two supply units,Each supply unit includes exchange regulated power supply and single phase step-down transformer,Stator bar test platform includes having reeded unshakable in one's determination and two stator bars,Iron core is made up of some stack of laminations equidistantly arranged,Two are placed with groove in the stator bar arranged up and down,Stator bar strand testing current platform includes magnetic field collector and signal conversion module,Magnetic field collector is communicated by signal conversion module with host computer,If magnetic field collector includes dry measure pcb board,All measurements are equidistantly fixed on one with pcb board by connector,And it is installed on every stator bar end both sides.This programme realizes stator bar strand current measurement on the basis of stator bar end construction is not destroyed.
Description
Technical field
It the utility model is related to generator stator bar detection field, and in particular to alternator frame bar strand electricity
Current test system.
Background technology
Large AC generator fixed line rod by many root flat copper strands and around rear, nose by and headgear connect, in addition
In order to increase the fastness of large AC generator fixed line rod, by each strand of stator bar by the way of extruding and gel
It is closely joined together so that have no gap between strand.
Because each flat copper strand of stator bar is in the location of end and groove portion difference, cause interlinked leakage magnetic flux
Difference, make leakage field induced electromotive force caused by each flat copper strand different, and then make to produce circulating current and circulation between strand
Loss, finally causes each strand temperature distributing disproportionation, has a strong impact on the safe operation of large-scale alternating current generator.In order to reduce stator
Winding circulation loss, improves strand Temperature Distribution, alternator frame bar strand is entered strand by the way of transposition
Row braiding transposition, changes each strand of stator bar in the location of end or groove portion.
In order to weigh inhibition of the transposition form to circulating current, measurement alternator frame winding transposition strand electricity
Stream has important meaning, current electromagnetic current transducer, Hall-type current transformer, Rogowski coil formula current transformer etc.
Sensor can not all be buried between stator bar strand.
At present, the measurement to stator bar strand electric current for convenience, the strand of stator bar end is opened, so that often
Certain gap is formed between root strand, current transformer is then buried and then measures each strand electric current of stator bar, this method
Though the measurement of strand electric current can be realized, it destroys large AC generator fixed line rod structure so that each stock of stator bar
The leakage magnetic flux that the leakage magnetic flux that line is interlinked is interlinked with each strand of actual stator bar differs, and causes the stator bar stock of measurement
Line current is not accurate enough, and another aspect this method will cause permanent damage to stator bar structure, is unfavorable for large-scale friendship
Flow generator stator bar strand current detecting.
Utility model content
For above-mentioned deficiency of the prior art, alternator frame bar strand electric current provided by the utility model is surveyed
Test system, it stator line segment end construction need not destroyed can be realized as the measurement of strand electric current.
In order to reach foregoing invention purpose, the technical solution adopted in the utility model is：
A kind of alternator frame bar strand current detecting system is provided, it includes power supply platform, stator bar is surveyed
Examination platform and stator bar strand testing current platform, power supply platform include two supply units, stator bar test platform bag
Reeded unshakable in one's determination and two stator bars of tool are included, two stator bars are positioned over the groove of iron core in a manner of arranging up and down
Interior, every stator bar both ends are connected with a supply unit；
Stator bar strand testing current platform includes magnetic field collector and signal conversion module, times of every stator bar
The both sides of one end same position are provided with a magnetic field collector, two magnetic field collectors by signal conversion module with it is upper
Position machine communication, if magnetic field collector includes dry measure pcb board, all measurements are equidistantly fixed on pcb board by connector
One, each measurement are provided with a Hall element with the plate face edge of pcb board.
Further, magnetic field collector is vertical with the short transverse of stator bar end where it, each magnetic field collector
Measurement with pcb board number be stator bar strand quantity half, the measurement position of all Hall elements of each magnetic field collector
Put stator bar where being close to.
Further, a connected capacity cell is additionally provided with the welding position of Hall element.
Further, adjacent measurement is with being provided with nylon spacer between pcb board, the measurement at nylon spacer position
With positioning hole is offered on pcb board, all measurements are engaged with pcb board by positioning hole with connector to be fixed as one.
Further, connector includes nylon screw and the nylon nut coordinated with nylon screw.
Further, each supply unit include be connected with each other exchange regulated power supply and single phase step-down transformer, every
Single phase step-down transformer is connected with a stator bar both ends, two single phase step-down transformers and two same sides of stator bar
A current transformer is provided with the circuit of portion's connection, two current transformers are connected with same multifunction instrument.
Further, it is unshakable in one's determination to be made up of some equidistantly arrangements and the reeded stack of lamination of tool, between adjacent stack of lamination
Gap form air duct.
Further, stator bar strand testing current platform also includes signal amplification circuit, and magnetic field collector passes through letter
Number amplifying circuit is connected with signal conversion module.
Compared with prior art, the beneficial effects of the utility model are：
This programme is carrying out strand current measurement process, and magnetic field collector directly is installed on into the two of stator bar end
Side, can be in the case where not destroying stator bar end construction, using multiple Hall elements of magnetic field collector to stator line
The magnetic field of stick end diverse location is acquired, afterwards by each strand electric current of stator bar of structure and stator bar end not
Tie-in equation with position magnetic field obtains every strand electric current.
Accurate measurement of the stator bar with phase groove and out-phase groove strand electric current is realized in this way, is advantageous to large-scale
Alternator frame bar circulation detects, and can make superior and inferior evaluating to positioning line rod transposition method.
Because if the magnetic field collector of this programme is equidistantly assembled with pcb board by dry measure, easy assembly and disassembly, side
Just stator bar end diverse location magnetic field is measured, is advantageous to build each strand electric current of stator bar and stator bar end difference
The tie-in equation in position magnetic field, finally it is convenient to calculating of the stator bar with phase groove and out-phase groove strand electric current.
Brief description of the drawings
Fig. 1 is the simplified pinciple block diagram of alternator frame bar strand current detecting system.
Fig. 2 is the refinement theory diagram of alternator frame bar strand current detecting system.
Fig. 3 and Fig. 4 is respectively the structure and schematic view of the mounting position of magnetic field collector.
Fig. 5 is the structural representation for being welded with measurement pcb board after Hall element and capacity cell.
Wherein, 1, power supply platform；11st, regulated power supply is exchanged；12nd, single phase step-down transformer；13rd, current transformer；14th, it is more
Function instrument；2nd, stator bar test platform；21st, stator bar；211st, single strand section；22nd, it is unshakable in one's determination；221st, stack of lamination；
222nd, air duct；3rd, stator bar strand testing current platform；31st, magnetic field collector；311st, measurement pcb board；3111st, Hall
Element；3112nd, capacity cell；3113rd, positioning hole；312nd, nylon screw；313rd, nylon spacer；314th, nylon nut；32nd, signal
Amplifying circuit；33rd, signaling conversion circuit；34th, host computer.
Embodiment
Specific embodiment of the present utility model is described below, in order to which those skilled in the art understand
The utility model, it should be apparent that the utility model is not limited to the scope of embodiment, to the common skill of the art
For art personnel, if various change in the spirit and scope of the present utility model that appended claim limits and determines,
These changes are it will be apparent that all are created in the row of protection using the utility model of the utility model design.
As shown in figure 1, the alternator frame bar strand current detecting system includes power supply platform 1, stator bar
Test platform 2 and stator bar strand testing current platform 3.
As shown in Fig. 2 power supply platform 1 includes two supply units, each supply unit includes the exchange He of regulated power supply 11
Single phase step-down transformer 12, two supply units can be each independently two stator bars 21 and provide that amplitudes are identical with frequency but phase
The different electric current in position, stator bar test platform 2 include tool reeded unshakable in one's determination 22 and two stator bars 21, iron core 22 it is recessed
Two are placed with groove in the stator bar 21 arranged up and down, the every both ends of stator bar 21 with it is single-phase in a supply unit
Step-down transformer 12 connects.
During implementation, two stator bars that this programme preferably uses are groove portion strand transposition by twisting, and end strand is not turned round
Translation bit, in this way after, each strand electric current of stator bar and stator bar end diverse location magnetic field can be reduced
The structure difficulty of tie-in equation, facilitate the quick calculating of strand electric current.
When implementing, two exchange regulated power supplies 11 of this programme are using the high performance programmable of California instrument CSW series
Power of alterating and direct current, two single phase step-down transformers 12 use BK-7000VA, two single-phase transformers 12 respectively with two stators
The both ends of bar 21 connect, and are all provided with the circuit that two single phase step-down transformers 12 are connected with two 21 same side ends of stator bar
A current transformer 13 is equipped with, two current transformers 13 are connected with same multifunction instrument 14, the He of current transformer 13
Multifunction instrument 14 is using integral ETCR4700 three-phase phase volt ampere meters.
Two current transformers 13 are respectively used to measure current amplitude, frequency and the phase of two stator bars 21, more work(
Can current amplitude, frequency of the instrument 14 for showing and monitoring two stator bars 21 that two current transformers 13 measure respectively
And phase, two current transformers 13 are combined with two supply units can realize two stator bars 21 with phase groove and out-phase
The strand current measurement of groove.
As shown in Fig. 2 stator bar strand testing current platform 3 includes magnetic field collector 31 and signal conversion module 33,
Magnetic field collector 31 is communicated by signal conversion module 33 with the host computer 34 of outside, and magnetic field collector 31, which is used to measure, to be determined
The end diverse location magnetic field of sub-line rod 21, when implementing, signal conversion module uses PCI1255 data collecting cards.
As shown in figure 3, if magnetic field collector 31 includes dry measure pcb board 311, all measurement pcb boards 311 pass through company
Fitting is equidistantly fixed on one, and the measurement of each magnetic field collector 31 is the strand quantity of stator bar 21 with the number of pcb board 311
Half, measurement are provided with a Hall element 3111 with the plate face edge of pcb board 311.
As shown in figure 4, the both sides of the every either end same position of stator bar 21 are respectively and fixedly provided with a magnetic field collector
31, the measurement position of all Hall elements 3111 of each magnetic field collector 31 is close to place stator bar 21, single strand
Section 211 is the end strand section of stator bar 21, and during implementation, preferably two stator bars 21 are installed in same side end
Magnetic field collector 31.
Magnetic field collector 31 is using after this structure, and it can not destroy the ply yarn structure of the end of stator bar 21, just
The collection in magnetic field at its position can be realized, the setting of the position of Hall element 3111 can make Hall element 3111 more neighbouring
The strand of stator bar 21, ensure that the magnetic field signal that Hall element 3111 gathers is stronger.
In one embodiment of the present utility model, adjacent measurement with being provided with nylon spacer 313 between pcb board 311,
Measurement at the position of nylon spacer 313 is with offering positioning hole 3113, all measurements pcb board 311 on pcb board 311
It is fixed as one by being engaged in positioning hole 3113 with connector.Connector include nylon screw 312 and with nylon screw 312
The nylon nut 314 of cooperation.
As shown in Fig. 2 magnetic field collector 31 is fixed on the end of stator bar 21, and with the height side of the end of stator bar 21
To vertical, on the one hand the welding position of all Hall elements 3111 is convenient to measure stator line adjacent to place stator bar 21
Stick end diverse location magnetic field, on the other hand it is convenient to each strand electric current of stator bar and stator bar end diverse location magnetic field
Tie-in equation foundation.
As shown in figure 5, a connected capacity cell 3112 is additionally provided with the welding position of Hall element 3111,
Capacity cell 3112 can ensure that the supply voltage of Hall element 3111 is stable.During implementation, the Hall element 3111 of this programme selection
Using SMD A1324, supply voltage 5V, capacity cell 3112 is using 0604 patch capacitor encapsulated.
As shown in Fig. 2 when implementing, the tool reeded unshakable in one's determination 22 that this programme is selected by some equidistantly arrangements and has
The stack of lamination 221 of groove forms, and the gap between adjacent stack of lamination 221 forms air duct 222, and the width of air duct 222 is
6mm。
Iron core 22 can be very good to simulate the air duct inside large-scale alternating current generator, so using after this structure
Error during strand current measurement can be reduced as far as possible, and large-scale alternator frame knot unshakable in one's determination is simulated to reach infinite approach
Structure.In addition, air duct 222 can also facilitate the heat in stator bar quickly to shed, the resistance of stator bar is avoided to increase shadow
Ring the accuracy of final strand current measurement.
As shown in Fig. 2 stator bar strand testing current platform 3 also includes signal amplification circuit 32, magnetic field collector 31
It is connected by signal amplification circuit 32 with signal conversion module 33, signal amplification circuit 32 is used for gather Hall element 3111
Voltage is amplified and eliminated quiescent output voltage, afterwards again by signal conversion module 33 by the plurality of voltages signal after amplification
(voltage signal that multiple Hall elements 3111 gather) changes into data signal and is stored in host computer 34.
Host computer 34 obtains the position of Hall element 3111 by the output voltage of Hall element 3111 and its sensitivity coefficient
Magnetic field intensity, afterwards again using each strand electric current of stator bar 21 and the end of stator bar 21 of obtained magnetic field intensity and structure
The tie-in equation in portion diverse location magnetic field obtains the electric current of every strand.
The alternator frame bar strand current detecting system measurement strand electric current method be：
Magnetic field collector 31 is installed on the every end both sides of stator bar 21, and records each Hall element 3111 and is located at
Measurement position residing for the end of stator bar 21, need to be by magnetic field collector 31 along stator bar when installing magnetic field collector 31
Vertically fixed in the short transverse of 21 ends, and all Hall elements 3111 are located proximate to surveyed stator bar 21, to survey
Measure larger magnetic field.
Regulation power supply device voltage magnitude and voltage-phase, until current amplitude and frequency phase on two stator bars 21
Deng, while record the output voltage amplitude and voltage-phase of the exchange regulated power supply 11 in two sets of supply units.
When two stator bars 21 are with phase groove or out-phase groove, the voltage that each Hall element 3111 exports is obtained；When
Current amplitude and frequency on two stator bars 21 is equal, and is same phase groove when the phase difference of two stator bars 21 is 0 °；
It is out-phase when the current amplitude on two stator bars 21 and frequency are equal, and the phase difference of two stator bars 21 is 30 °
Groove.
Calculate the magnetic field intensity of the place measurement position of Hall element 3111：
Wherein, B is the magnetic field intensity of measurement position where Hall element；UHFor hall element output voltage；kHFor Hall
The sensitivity coefficient of element.
Using the tie-in equation in each strand electric current of the stator bar 21 of structure and the end diverse location magnetic field of stator bar 21,
Calculate the strand electric current of every strand of two stator bars 21：
Wherein, I1~I2nRespectively 1~2n roots strand electric current；B1~B2nRespectively the 1~2n Hall element 3111
In the magnetic field intensity of the end of stator bar 21 measurement；k(1,1)~k(2n,2n)The respectively magnetic of the place measurement position of Hall element 3111
Field and the proportionality coefficient of each strand electric current；k(1,1)~k(1,2n)For first place measurement position of Hall element 3111 magnetic field with
The proportionality coefficient of 1~2n strand electric currents；k(1,1)~k(2n,1)For the magnetic of the 1~2n place measurement position of Hall element 3111
Field and the proportionality coefficient of the first personal share line current；N is the strand number of two stator bars 21.
This programme measures obtained magnetic field by Hall element 3111, with reference to the constructed each strand electric current of stator bar 21
With the tie-in equation in the end diverse location magnetic field of stator bar 21, the situation of the end construction of stator bar 21 can be not being destroyed,
Accurately measure the strand electric current of every strand of two stator bars 21.
Claims (8)
1. alternator frame bar strand current detecting system, including power supply platform, stator bar test platform and stator
Bar strand testing current platform, it is characterised in that the power supply platform includes two supply units, the stator bar test
Platform includes having reeded unshakable in one's determination and two stator bars, and two stator bars are positioned over iron core in a manner of arranging up and down
In groove, every stator bar both ends are connected with a supply unit；
The stator bar strand testing current platform includes magnetic field collector and signal conversion module, times of every stator bar
The both sides of one end same position are provided with a magnetic field collector, two magnetic field collectors by signal conversion module with it is upper
Position machine communication, the magnetic field collector include some identical measurement pcb boards, and all measurement pcb boards pass through connector etc.
Spacing is fixed on one, and each measurement is provided with a Hall element with the plate face edge of pcb board.
2. alternator frame bar strand current detecting system according to claim 1, it is characterised in that the magnetic
Field collector is vertical with the short transverse of stator bar end where it, and the measurement of each magnetic field collector is with pcb board number
Stator bar strand quantity half, the measurement position of all Hall elements of each magnetic field collector are close to place stator line
Rod.
3. alternator frame bar strand current detecting system according to claim 2, it is characterised in that it is described suddenly
A connected capacity cell is additionally provided with the welding position of your element.
4. alternator frame bar strand current detecting system according to claim 2, it is characterised in that adjacent
Measurement is with being provided with nylon spacer between pcb board, the measurement at the nylon spacer position is with offering positioning on pcb board
Hole, all measurements are engaged with the connector by positioning hole with pcb board and are fixed as one.
5. the alternator frame bar strand current detecting system according to claim 3 or 4, it is characterised in that institute
Stating connector includes nylon screw and the nylon nut coordinated with nylon screw.
6. alternator frame bar strand current detecting system according to claim 1, it is characterised in that Mei Gesuo
State exchange regulated power supply and single phase step-down transformer that supply unit includes being connected with each other, every single phase step-down transformer and one
Stator bar both ends connect, and are respectively provided with the circuit that two single phase step-down transformers are connected with two same side ends of stator bar
There is a current transformer, two current transformers are connected with same multifunction instrument.
7. alternator frame bar strand current detecting system according to claim 1, it is characterised in that the iron
The heart is made up of some equidistantly arrangements and the reeded stack of lamination of tool, and the gap between adjacent stack of lamination forms air duct.
8. alternator frame bar strand current detecting system according to claim 1, it is characterised in that described fixed
Sub-line rod strand testing current platform also includes signal amplification circuit, and the magnetic field collector passes through signal amplification circuit and signal
Modular converter connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721253377.3U CN207215891U (en) | 2017-09-27 | 2017-09-27 | Alternator frame bar strand current detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721253377.3U CN207215891U (en) | 2017-09-27 | 2017-09-27 | Alternator frame bar strand current detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207215891U true CN207215891U (en) | 2018-04-10 |
Family
ID=61819508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721253377.3U Withdrawn - After Issue CN207215891U (en) | 2017-09-27 | 2017-09-27 | Alternator frame bar strand current detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207215891U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632182A (en) * | 2017-09-27 | 2018-01-26 | 哈尔滨理工大学 | Alternator frame bar strand current detecting system and the method for measuring strand electric current |
| CN109374949A (en) * | 2018-10-10 | 2019-02-22 | 哈尔滨理工大学 | Current detecting system |
| CN112630514A (en) * | 2020-09-25 | 2021-04-09 | 中国船舶重工集团公司第七一三研究所 | Current detection device of alternating-current frequency converter |
-
2017
- 2017-09-27 CN CN201721253377.3U patent/CN207215891U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632182A (en) * | 2017-09-27 | 2018-01-26 | 哈尔滨理工大学 | Alternator frame bar strand current detecting system and the method for measuring strand electric current |
| CN109374949A (en) * | 2018-10-10 | 2019-02-22 | 哈尔滨理工大学 | Current detecting system |
| CN112630514A (en) * | 2020-09-25 | 2021-04-09 | 中国船舶重工集团公司第七一三研究所 | Current detection device of alternating-current frequency converter |
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| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180410 Effective date of abandoning: 20230704 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180410 Effective date of abandoning: 20230704 |