CN105676112A - Universal fault detection method and apparatus for twelve-phase rectifier bridge - Google Patents
Universal fault detection method and apparatus for twelve-phase rectifier bridge Download PDFInfo
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- CN105676112A CN105676112A CN201610119404.1A CN201610119404A CN105676112A CN 105676112 A CN105676112 A CN 105676112A CN 201610119404 A CN201610119404 A CN 201610119404A CN 105676112 A CN105676112 A CN 105676112A
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- 238000001514 detection method Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 claims description 20
- 238000012935 Averaging Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 abstract description 6
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
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- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a universal fault detection method and apparatus for a twelve-phase rectifier bridge. The universal fault detection apparatus is composed of an AD sampling circuit, a digital signal processor, a display screen, a first analog multiplexer and a second analog multiplexer. Input terminals of the first analog multiplexer and the second analog multiplexer are connected with a twelve-phase rectifier bridge by voltage-dividing resistors; control terminals of the first analog multiplexer and the second analog multiplexer are connected with a control terminal of the digital signal processor; output terminals of the first analog multiplexer and the second analog multiplexer are connected with an input terminal of the AD sampling circuit by an isolated amplifier and a coupler; an output terminal of the AD sampling circuit is connected with an input terminal of the digital signal processor; and an output terminal of the digital signal processor is connected with the display screen. According to the invention, the AD sampling circuit collects voltages of a diode and the state of the corresponding diode is determined based on the digital signal processing and analysis on data; and various fault states are displayed on the display screen. Moreover, the apparatus has advantages of simple structure, convenient operation, and high universality.
Description
Technical field
The invention belongs to rectifier bridge device fault detection technique field, be specifically related to a kind of universal 12-phase rectification bridge fault detection method and device.
Background technology
Existing 12-phase rectification failure detector is to be completed by voltage comparable chip through 51 single-chip microcomputers, it it is a kind of digital therefore checking device, the size that this digital event checking device passes through mated electric moter voltage designs its hardware circuit, the detection of major part motor on the market cannot be completed, do not possess versatility. And digital event checking device judges the state of corresponding diode by the color that LED is glimmered, it is impossible to the voltage of display electromotor and Generator Status, waveform and viewing historical failure more cannot be gathered.
Summary of the invention
The purpose of the present invention is contemplated to solve the deficiency that above-mentioned background technology exists, it is provided that a kind of universal 12-phase rectification bridge fault detection method and device.
The technical solution used in the present invention is: a kind of universal 12-phase rectification bridge fault detection method, detect including diode open circuit fault, detection process is: arrange the upper pipe fault detect value of diode, every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, upper pipe fault-signal value is obtained according to voltage magnitude, upper pipe fault-signal value and upper pipe fault detect value are compared, when upper pipe fault-signal value is more than upper pipe fault detect value, it is judged that on the diode of this phase, open circuit fault occurs in pipe; The lower pipe fault detect value of diode is set, every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, remove tube fault-signal value is obtained according to voltage magnitude, lower pipe fault-signal value and lower pipe fault detect value are compared, when fault-signal value is less than lower pipe fault detect value, it is judged that under the diode of this phase, open circuit fault occurs in pipe.
Further, the method obtaining upper pipe fault-signal value according to voltage magnitude is: arrange the positive zero of pipe on diode inclined, gather all magnitudes of voltage counted in voltage waveform one or more cycle, be upper pipe fault-signal value by averaging again after all inclined more than the positive zero magnitude of voltage summation collected.
Further, the method obtaining remove tube fault-signal value according to voltage magnitude is: arrange the negative zero of pipe under diode inclined, gather all magnitudes of voltage counted in voltage waveform one or more cycle, be lower pipe fault-signal value by averaging again after all inclined less than the negative zero magnitude of voltage summation collected.
Further, also include electrical fault detection, detection process is: detection 12-phase rectification bridge rectification after PN terminal voltage, if detection PN terminal voltage less than rated voltage 80% or more than rated voltage 20%, then be judged as electrical fault.
Further, also including the detection of motor correspondence phase disconnection fault, detection process is: every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is the 1/2 of normal value of detection, it is judged that disconnection fault occurs in this phase; Every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is the 1/2 of normal value of detection, it is judged that disconnection fault occurs in this phase.
Further, also including shorted diode fault detection, detection process is: every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is zero of detection, it is judged that on the diode of this phase, short trouble occurs in pipe; Every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is zero of detection, it is judged that under the diode of this phase, short trouble occurs in pipe.
A kind of universal 12-phase rectification bridge failure detector, including AD sample circuit, digital signal processor, display screen, it is respectively used to gather the first analog multiplexer and second analog multiplexer of tube voltage and lower tube voltage on 12-phase rectification bridge, the input of described first analog multiplexer and the second analog multiplexer connects 12-phase rectification bridge respectively through divider resistance, the end that controls of the first analog multiplexer and the second analog multiplexer is all connected with the control end of digital signal processor, the outfan of the first analog multiplexer and the second analog multiplexer connects the input of AD sample circuit respectively through isolation amplifier and optocoupler, the outfan of AD sample circuit connects the input of digital signal processor, the outfan of digital signal processor connects display screen.
The present invention gathers diode voltage by AD sample circuit and analog multiplexer, the state of corresponding diode is judged through Digital Signal Processing DSP analytical data, and communicated by MODBUS agreement and display screen, detected by display screen and show various malfunctions and the parameter of mated motor is set, simple in construction, easy to operate, and can mate with any below 4000V motor, highly versatile. Meanwhile, when detection by detect every voltage characteristic value mutually and between P point judge on the fault of pipe, judge the fault of lower pipe by detecting the voltage characteristic value between every phase and N point, testing result is more accurate.
Accompanying drawing explanation
Fig. 1 is the elementary diagram of universal 12-phase rectification electromotor.
Fig. 2 is the flow chart that fault detect of the present invention gathers data.
Fig. 3 is the theory diagram of the universal 12-phase rectification bridge failure detector of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, it is simple to be well understood to the present invention, but the present invention is not constituted restriction by them.
It is illustrated in figure 1 the schematic diagram of 12-phase rectification electromotor, 12-phase rectification is formed by four groups of uncontrollable rectifier bridge parallel connections of three-phase, wherein U1, V1, W1, U2, V2, W2, U3, V3, W3, U4, V4, W4 are four groups of three-phase voltages, totally ten two-phase voltage, P, N are the DC voltage after rectification.
In order to more accurately, comprehensively judge commutation diode fault, after all possible fault assembled state has been carried out emulation, according to analysis of simulation result, as long as asynchronously occurring all diodes manage whole open circuit fault under pipe or all diodes, then can accurately judge diode breakdown state by the voltage waveform at detection diode two ends. Actually, when the whole upper pipe of commutation diode or lower pipe break down simultaneously, rectification circuit cannot form loop, also rectification function is just lost, therefore the basic ideas that the present invention realizes 12-phase rectification bridge fault detect are: judge the fault of upper pipe by detecting every voltage characteristic value mutually and between P point, in like manner, the fault of lower pipe is judged by detecting every voltage characteristic value mutually and between N point. Concrete fault detect includes the detection of diode open circuit fault, shorted diode fault detection, electrical fault detection phase disconnection fault corresponding to motor detection, and concrete detection process is as follows:
Diode open circuit fault detects, detection process is: according to analysis of simulation result, the fault detect value of upper pipe is greater than the inclined 2V of positive zero, the fault detect value of lower pipe is less than negative zero-2V partially, respectively to managing in fault and the upper pipe fault detect value G1 and lower pipe fault detect value G2 of pipe setting one under fault.
Every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, gather all magnitudes of voltage counted in voltage waveform one or more cycle, upper pipe fault-signal value is obtained by averaging again after all inclined more than the positive zero magnitude of voltage summation collected, upper pipe fault-signal value is compared with upper pipe fault detect value G1, when upper pipe fault-signal value is more than upper pipe fault detect value, it is judged that on the diode of this phase, open circuit fault occurs in pipe;
Every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, gather all magnitudes of voltage counted in voltage waveform one or more cycle, lower pipe fault-signal value is obtained by averaging again after all inclined less than the negative zero magnitude of voltage summation collected, lower pipe fault-signal value and lower pipe fault detect value are compared, instantly when pipe fault-signal value is less than lower pipe fault detect value G2, it is judged that under the diode of this phase, open circuit fault occurs in pipe.
When the present invention gathers voltage waveform, as shown in Figure 2, the every 20us of interrupt function gathers a point, counting of one periodic waveform to determine count=" 10 " ^6/20f according to waveform frequency, when a-c cycle is set to 217Hz, then counting of a periodic waveform is 213 points, in order to eliminate the shake caused because of channel change, remove the data that first three cycle collects, start to gather data from the 4th cycle, by collect more than (Shangguan) and less than (lower pipe) just, the point of the inclined fault eigenvalue of negative zero sues for peace (upper pipe) respectively, by various and ask for sampling number averaged, if meansigma methods compares with short circuit and open circuit fault eigenvalue, whether judgement manages normal up and down, and each pipe status word is stored in an array, wait that display screen request data sends. if display screen does not send data transfer command, status word next time will cover this group data automatically. if program is in operation, display screen request gathers waveform, then program will gather waveform mark position 1, time interrupt function is being in waveform acquisition pattern, the waveform of collection is stored in external RAM, if waveform acquisition completes, DSP can send order and display screen, informs that Wave data has reached required counting, request is uploaded, and such data send with regard to one 16 words one group.If master control borad receives the display screen amendment parameter of electric machine order, by terminal all operations, waiting the data that need to revise to be received, data modification completes, and Automatic Program resets, and it is successfully modified to send commands to notice screen data. The process that the detection of following shorted diode fault, electrical fault detection and the detection of motor correspondence phase disconnection fault gather data is identical with diode open circuit fault detection process.
The detection process of shorted diode fault detection is: every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is zero of detection, it is judged that on the diode of this phase, short trouble occurs in pipe; Every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is zero of detection, it is judged that under the diode of this phase, short trouble occurs in pipe.
Electrical fault detection detection process be: detection 12-phase rectification bridge rectification after PN terminal voltage, if detection PN terminal voltage less than rated voltage 80% or more than rated voltage 20%, then be judged as electrical fault.
The detection process of motor correspondence phase disconnection fault detection is: every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is the 1/2 of normal value of detection, it is judged that disconnection fault occurs in this phase; Every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is the 1/2 of normal value of detection, it is judged that disconnection fault occurs in this phase.
As shown in Figure 3, realize the principle of device block diagram of above-mentioned universal 12-phase rectification bridge fault detect for the present invention, including analog interface plate, master control borad and display screen, the safe voltage of analog interface plate ranges for 0～4000VAC, can mate with any below 4000V motor, highly versatile; One piece of master control borad can connect two blocks of analog boards, namely can gather the rectifier bridge data of two commutating machines simultaneously. The various states of display screen homepage display 12-phase rectification bridge, corresponding break mutually including shorted diode and open circuit, motor, Generator Status, DC voltage and self-check of device situation. Master control borad passes through 232 mouthfuls with MODBUS agreement and display screen communication, phase interchangeable data, user only needs to input the rated direct voltage of motor, a-c cycle, open circuit fault eigenvalue, short trouble eigenvalue, positive negative zero partially by display screen, and the fault detect that just can realize motor 12-phase rectification bridge of counting of required collection.
Concrete analog interface plate includes divider resistance, first analog multiplexer, second analog multiplexer and isolation amplifier and optocoupler, master control borad includes AD sample circuit, digital signal processor, wherein the input of the first analog multiplexer and the second analog multiplexer connects 12-phase rectification bridge respectively through divider resistance, the end that controls of the first analog multiplexer and the second analog multiplexer is all connected with the control end of digital signal processor, the outfan of the first analog multiplexer and the second analog multiplexer connects the input of AD sample circuit respectively through isolation amplifier and optocoupler, the outfan of AD sample circuit connects the input of digital signal processor, the outfan of digital signal processor connects display screen.
Analog interface plate primary responsibility gathers U1, V1, W1, U2, V2, W2, U3, V3, W3, U4, V4, W4, P, N voltage signal, first analog multiplexer and the second analog multiplexer are subject to the signal of digital signal processor DSP to control by tube voltage, lower tube voltage on divider resistance respectively piecewise acquisition, wherein the voltage difference of DC side positive pole and ten two-phases is upper tube voltage, the pressure reduction of negative pole and ten two-phases is lower tube voltage, the voltage between PN be motor rectified after rated direct voltage.The two-way voltage signal collected is transferred in the AD sample circuit of master control borad through high_voltage isolation amplifier and optocoupler, and the voltage signal after sampling relatively judges the situation of gathered waveform correspondence diode through digital signal processor DSP computing. Digital signal processor DSP will be temporarily stored in its ROM after data analysis, waits display screen request data, and the every 50ms of display screen asks digital signal processor DSP to send and patrols and examines data. Wherein AD sample circuit adopts conventional AD7606 chip, and digital signal processor is DSP28335.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (7)
1. a universal 12-phase rectification bridge fault detection method, it is characterized in that: include the detection of diode open circuit fault, detection process is: arrange the upper pipe fault detect value of diode, every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, upper pipe fault-signal value is obtained according to voltage magnitude, upper pipe fault-signal value and upper pipe fault detect value are compared, when upper pipe fault-signal value is more than upper pipe fault detect value, it is judged that on the diode of this phase, open circuit fault occurs in pipe; The lower pipe fault detect value of diode is set, every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, remove tube fault-signal value is obtained according to voltage magnitude, lower pipe fault-signal value and lower pipe fault detect value are compared, when fault-signal value is less than lower pipe fault detect value, it is judged that under the diode of this phase, open circuit fault occurs in pipe.
2. the universal 12-phase rectification bridge fault detection method of one according to claim 1, it is characterized in that: the method obtaining upper pipe fault-signal value according to voltage magnitude is: arrange the positive zero of pipe on diode inclined, gather all magnitudes of voltage counted in voltage waveform one or more cycle, be upper pipe fault-signal value by averaging again after all inclined more than the positive zero magnitude of voltage summation collected.
3. the universal 12-phase rectification bridge fault detection method of one according to claim 1, it is characterized in that: the method obtaining remove tube fault-signal value according to voltage magnitude is: arrange the negative zero of pipe under diode inclined, gather all magnitudes of voltage counted in voltage waveform one or more cycle, be lower pipe fault-signal value by averaging again after all inclined less than the negative zero magnitude of voltage summation collected.
4. the universal 12-phase rectification bridge fault detection method of one according to claim 1, it is characterized in that, also include electrical fault detection, detection process is: the PN terminal voltage after detection 12-phase rectification bridge rectification, if detection PN terminal voltage less than rated voltage 80% or more than rated voltage 20%, then be judged as electrical fault.
5. the universal 12-phase rectification bridge fault detection method of one according to claim 1, it is characterized in that, also include the detection of motor correspondence phase disconnection fault, detection process is: every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is the 1/2 of normal value of detection, it is judged that disconnection fault occurs in this phase; Every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is the 1/2 of normal value of detection, it is judged that disconnection fault occurs in this phase.
6. the universal 12-phase rectification bridge fault detection method of one according to claim 1, it is characterized in that, also include shorted diode fault detection, detection process is: every voltage waveform mutually and between P point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is zero of detection, it is judged that on the diode of this phase, short trouble occurs in pipe;Every voltage waveform mutually and between N point of detection 12-phase rectification bridge respectively, when when wherein a phase voltage amplitude is zero of detection, it is judged that under the diode of this phase, short trouble occurs in pipe.
7. a universal 12-phase rectification bridge failure detector, it is characterized in that: include AD sample circuit, digital signal processor, display screen, it is respectively used to gather the first analog multiplexer and second analog multiplexer of tube voltage and lower tube voltage on 12-phase rectification bridge, the input of described first analog multiplexer and the second analog multiplexer connects 12-phase rectification bridge respectively through divider resistance, the end that controls of the first analog multiplexer and the second analog multiplexer is all connected with the control end of digital signal processor, the outfan of the first analog multiplexer and the second analog multiplexer connects the input of AD sample circuit respectively through isolation amplifier and optocoupler, the outfan of AD sample circuit connects the input of digital signal processor, the outfan of digital signal processor connects display screen.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627729A (en) * | 2017-03-21 | 2018-10-09 | 聚积科技股份有限公司 | Failure detection system and method thereof |
| CN113092119A (en) * | 2021-03-16 | 2021-07-09 | 中国人民解放军海军工程大学 | Fault simulation device for rectifier generator set |
| CN113522788A (en) * | 2021-08-16 | 2021-10-22 | 如皋市大昌电子有限公司 | Testing and sorting method for rectifier bridge stack |
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| CN113522788A (en) * | 2021-08-16 | 2021-10-22 | 如皋市大昌电子有限公司 | Testing and sorting method for rectifier bridge stack |
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| CN105676112B (en) | 2019-04-23 |
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Application publication date: 20160615 Assignee: Jiangsu Daqo Kaifan Electrical Appliance Co.,Ltd. Assignor: Wuhan New Energy Institute of Access Equipment & Technology Co.,Ltd. Contract record no.: X2020980000426 Denomination of invention: Universal fault detection method and apparatus for twelve-phase rectifier bridge Granted publication date: 20190423 License type: Exclusive License Record date: 20200303 |
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