CN107843805A - Brushless exciter rotating diode open fault inline diagnosis method - Google Patents
Brushless exciter rotating diode open fault inline diagnosis method Download PDFInfo
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- CN107843805A CN107843805A CN201711036670.9A CN201711036670A CN107843805A CN 107843805 A CN107843805 A CN 107843805A CN 201711036670 A CN201711036670 A CN 201711036670A CN 107843805 A CN107843805 A CN 107843805A
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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
Abstract
The invention discloses a kind of brushless exciter rotating diode open fault inline diagnosis method, this method makes a call to 2 radial direction through holes vertically in the iron yoke between brushless excitation machine stator adjacent pole, the magnetic-field measurement coil of insulating barrier is installed by the two holes in stator iron yoke, coil output connects data collecting instrument, in brushless exciter running, gather the output voltage of the coil in real time using data collecting instrument, and real-time Fourier transformation is carried out to output voltage, obtain and armature speed identical harmonic voltage amplitude, when the value exceedes fault threshold, judge that open fault occurs in brushless exciter rotating diode.The present invention can improve the deficiencies in the prior art, improve the diagnostic level of brushless exciter rotating diode open fault.
Description
Technical field
The present invention relates to technical field of generators, especially a kind of brushless exciter rotating diode open fault is examined online
Disconnected method.
Background technology
Brushless excitation technology was widely applied in large turbo-type generator group in recent years, the magnetic of brushless exciter
Pole part remains stationary, armature are rotated with generator with synchronous speed, and armature winding cuts static magnetic field and induced electromotive force, will
The Exciting Windings for Transverse Differential Protection that armature winding passes through rotary rectifier bridging sending and receiving motor, you can provide exciting current for generator, regulation is brushless
The exciting current of exciter is that the regulation to the exciting current of generator can be achieved.Compared with static excitation mode, brushless excitation
Mode has the advantages that noise is small, fault rate is relatively low, but the diode on rotary rectifier bridge damages in the case of high speed, high load capacity
It is bad to happen occasionally.May cause when rotating diode damage quantity is more generator can not normal excitation, consequence is extremely serious.
Therefore, the accurate detection of failure progress to rotating rectifier is very necessary.
At present, the rotating diode open fault detection method of brushless excitation unit mainly has DNC methods, harmonic wave induction coil
Method, exciting current Harmonic Method and stroboscope method etc..DNC methods install Hall sensor on exciter stator, and (generally three logical
Road), rotating rectifier rotates with rotor, if the diode of inswept Hall sensor is in the conduction state, will feel in the sensor
Answer voltage pulse signal.In one swing circle of rotor, if the number of voltage pulse signal and diode in rotating rectifier
Mesh is identical, then illustrates that diode operation is normal；If voltage pulse number is less than number of diodes, illustrate diode event occur
Barrier, the induced voltage number of pulses of loss is the quantity of failure diode.The advantages of this method be with fault location function,
Suitable for the rotating rectifier of different rectifier structures, the induced voltage of Hall sensor directly reflects that rotating rectifier is each mutually each point
The on off operating mode of branch.The shortcomings that DNC methods, is also fairly obvious：In actual moving process, Hall sensor less stable, warp
Often there is service behaviour to decline, measurement inaccuracy is caused by collision displacement, caused distorted signals etc. to ask by greasy dirt or dust pollution
Topic, also there is transmission cable, false alarm caused by aviation plug wiring virtual connection, malfunction rate or tripping rate are all higher.Harmonic wave
Induction coil method is in nineteen ninety-five《East motor》" brushless synchronous machine measuring the current in the rotor and the faults in rotating rectifiers inspection delivered
Survey " it is reported, this method proposes that measuring coil is installed in the middle part of the magnetic pole with exciter or between magnetic pole (to be usually chosen between magnetic pole
Measuring coil is installed, measuring coil is enclosed on the small magnetic pole increased newly between magnetic pole), by specific humorous in measuring coil induced voltage
Wave component diagnoses faults in rotating rectifiers.2000《Automation and instrument》" the brushless synchronous machine measuring the current in the rotor delivered
And the research of rotating rectifier faults monitoring device ", 2005《Electrical equipment and electrical technology》" the brushless synchronous based on DSP delivered
Motor energization current measurement and rotating rectifier faults monitoring research " discusses the specific implementation of this method.This method
Weak point is that the space between brushless exciter adjacent pole is limited, installs small magnetic pole and measuring coil or even exciter need to be entered
Row transformation, measuring coil is relatively difficult when installing, and technological requirement is higher, and small magnetic pole and measuring coil dislocation easily occur and loosened
And damage, therefore less use in actual applications.The general principle of exciting current Harmonic Method is：Event occurs for rotary diodes
After barrier, armature of exciter winding can not be turned on by normal rule, cause air-gap field harmonic components and ratio change, excitation around
The harmonic current of specific frequency is induced in group, passes through exciting current harmonic components variation diagnostic rotating diode open fault.
2008《Sichuan Electric Power technology》" the no-brush synchronous generator Fault Diagnosis of Rotating Rectifier based on wavelet neural network delivered
Research ", 2003《Relay》Deliver " fuzzy neural network of brushless excitation synchronous generator faults in rotating rectifiers is examined
It is disconnected ", 2003《Chinese e measurement technology》" the real-time monitoring of no-brush synchronous generator faults in rotating rectifiers " delivered is to excitation
Current method has carried out further development and application.Exciting current method only needs to gather the exciting current of brushless exciter, implements
Come relatively simple, shortcoming is that signal transacting is complex, and DC component is big in exciting current, harmonic content is relatively small, it is necessary to
By signal transactings such as blocking, amplifications.In addition, this method is required for calculating its fault signature for every specific brushless exciter
Harmonic wave, therefore this method lacks universal adaptability.The general principle of stroboscope method is：Each the two of brushless exciter rotating rectifier
Pole pipe is provided with the fuse and luminous tube of series connection, and luminous tube can light during diode normally, can not then be lighted after failure,
The break-make of diode can be determined by the luminous situation of personal monitoring's luminous tube.Brushless excitation machine rotor rotates at a high speed, can not
Observe directly luminous tube and light situation, it is necessary to be realized by stroboscope.Stroboscope can send of short duration and frequent flash of light, when
When flash frequency and the close or synchronous velocity of rotation of testee, the hair of luminous tube can be observed using the persistence of vision of eyes
Light situation.This method has use in various types of brushless exciters, and its shortcoming is to belong to off-line checking method, Zhi Nengjin
Row is inspected periodically, it is impossible to as real-time monitoring means.1996《Electrotechnics journal》" the rotating rectifier faults monitoring delivered
A kind of method " propose the voltage of each characteristic point of rotating rectifier is examined using the SCM system being installed on rotor
Survey and judge, pipe is arranged by the infrared light pulse of specific coding by a pair of infrared emission/receptions the information on rotor is passed
Stationary side is sent to, realizes the real-time monitoring to rotating diode failure.Brushless exciter is usually that steam turbine generator offer is encouraged
Magnetic, the rotating speed of steam turbine generator is high, and the space of shafting is limited, the installing of the SCM system, the power supply under high rotating speed, turns
Sub- dynamic balancing, operational reliability, multi channel signals transmission etc. are problematic in that, therefore this method is at present only in the water wheels of the slow-speed of revolution
Applied on generating set, have no and applied in Turbo-generator Set.Text " M.Salah, K.Bacha,
A.Chaari.Brushless three-phase synchronous generator under rotating diode
failure conditions.IEEE Transactions on Energy Conversion,Vol.29,No.3,pp.594-
601,2014 " analyze the output voltage of three-phase brushless commutation system and diode breakdown under synchronous generator Light Condition
Contact, proposes to install search coil outside the casing of exciter, utilizes 6 subharmonic variation diagnostic diodes in stray flux
Failure.Text " Batzel T D, Swanson D C, Defenbaugh J F.Predictive Diagnostics for the
Main Field Winding and Rotating Rectifier Assembly in the Brushless
Synchronous Generator.4th IEEE International Symposium on Diagnostics for
Electric Machines, Power Electronics and Drives.Atlanta, 2003 ", which analyze three phase rectifier, encourages
The excitation demand of influence and generator of the magnetomechanical diode open-circuit failure to generator field, it is believed that diode open-circuit failure will be led
Cause the exciting current increase of brushless exciter.The number of poles and the number of phases of brushless exciter are more, and the single diode of a bridge wall is opened
Influence of the road failure to exciting current of exciter is very little.Further, it is contemplated that the influence of the factor such as magnetic hysteresis, saturation, excitation
Machine exciting current and the non-one-to-one relationship of generator operating mode, therefore, it is difficult to which it is normal to distinguish exciting current of exciter increase
Caused by adjustment of field excitation or diode open-circuit failure, the practicality of this method is not high.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of brushless exciter rotating diode open fault inline diagnosis
Method, the deficiencies in the prior art are can solve the problem that, improve the diagnostic level of brushless exciter rotating diode open fault.
In order to solve the above technical problems, the technical solution used in the present invention is as follows.
A kind of brushless exciter rotating diode open fault inline diagnosis method, in brushless excitation machine stator adjacent pole
Between iron yoke on make a call to 2 radial direction through holes vertically, magnetic-field measurement coil is installed in stator iron yoke by the two holes, in nothing
In brush exciter running, the induced voltage of the coil is gathered using data collecting instrument, and real-time Fu is carried out to the voltage
In leaf transformation, obtain with armature speed identical harmonic voltage amplitude, by the value compared with fault threshold, when the value exceedes
During fault threshold, judge that open fault occurs in brushless exciter rotating diode.
Preferably, when brushless exciter rated speed be 1500 revs/min, fault characteristic frequency 25Hz；When brushless
The rated speed of exciter is 3000 revs/min, fault characteristic frequency 50Hz.
Preferably, fault threshold is set as 0.02V.
It is using beneficial effect caused by above-mentioned technical proposal：The present invention carries diagnostic method and is capable of detecting when difference
The rotating diode open fault of the brushless exciter of the number of phases and number of pole-pairs, there is good applicability, magnetic-field measurement coil
Simply, conveniently, safe for operation, reliable, fault rate is low, and does not disturb the normal operation of brushless exciter for installation, to rotation two
The open fault of pole pipe has sensitive reflection, can be widely applied to the online prison of brushless exciter rotating diode open fault
Survey.The diagnostic method of the present invention does not need complicated signal transacting link, special for the failure of the brushless exciter of different model
It is known to levy frequency, therefore its versatility is more preferable.
Promethean propose of the present invention makes a call to 2 radial direction through hole installation magnetic field detections in brushless excitation machine stator iron yoke
Coil, the method that the alternating magnetic field of stator iron yoke is flowed through in measurement, can more effectively detect the local alternation magnetic for flowing through stator iron yoke
It is logical, further obtain fault signature.2 radial direction through holes are made a call in stator iron yoke easily to realize, have no substantial effect on brushless encourage
The main magnetic field distribution of magnetomechanical.
Brief description of the drawings
Fig. 1 is the circuit diagram that armature of exciter winding and generator excitation winding are formed；
Fig. 2 is the 1st phase armature supply waveform when diode is normal；
Fig. 3 is the 2nd phase armature supply waveform when diode is normal；
1st phase armature supply waveform when Fig. 4 is Bridge 1 upper half bridge arm diode open-circuit；
2nd phase armature supply waveform when Fig. 5 is Bridge 1 upper half bridge arm diode open-circuit；
Difference waveform of the 1st phase armature supply with respect to normal value when Fig. 6 is Bridge 1 upper half bridge arm diode open-circuit；
Difference waveform of the 2nd phase armature supply with respect to normal value when Fig. 7 is Bridge 1 upper half bridge arm diode open-circuit；
Fig. 8 is diode each cell current distribution map of A period rotors under normal circumstances；
Fig. 9 is diode each cell current distribution map of B period rotors under normal circumstances；
Figure 10 is each cell current distribution map of A period rotors after Bridge 1 upper half bridge arm diode open-circuit；
Figure 11 is each cell current distribution map of B period rotors after Bridge 1 upper half bridge arm diode open-circuit；
Figure 12 is the whole A period armature mmfs distribution maps under normal circumstances of diode；
A period armature mmf distribution maps when Figure 13 is Bridge 1 upper half bridge arm diode open-circuit；
Figure 14 is A period armature mmf increments；
Figure 15 is the whole B period armature mmfs distribution maps under normal circumstances of diode；
B period armature mmf distribution maps when Figure 16 is Bridge 1 upper half bridge arm diode open-circuit；
Figure 17 is B period armature mmf increments；
Figure 18 is brushless exciter rotating diode open fault detection principle diagram；
Figure 19 is the 1st, 2 phase armature supply waveform when rotating diode is normal；
1st, 2 phase armature supply waveforms when Figure 20 is Bridge 1 upper half bridge arm diode open-circuit；
Figure 21 is magnetic-field measurement coil-induced voltage waveform when rotating diode is normal；
Magnetic-field measurement coil-induced voltage waveform when Figure 22 is Bridge 1 upper half bridge arm diode open-circuit；
Figure 23 is the coil-induced voltage spectrum of magnetic-field measurement global figure when rotating diode is all normal；
Figure 24 is magnetic-field measurement coil-induced voltage spectrum Local map when rotating diode is all normal；
The coil-induced voltage spectrum of magnetic-field measurement global figure when Figure 25 is Bridge 1 upper half bridge arm diode open-circuit；
Magnetic-field measurement coil-induced voltage spectrum Local map when Figure 26 is Bridge 1 upper half bridge arm diode open-circuit.
In figure：1st, magnetic-field measurement coil, 2, armature winding, 3, armature core, 4, stator iron yoke, 5, stator winding, 6, number
According to Acquisition Instrument
Embodiment
Each symbol inventory is in text：
v1, v2…v39Respectively the 1st phase, the 2nd phase ..., the fundamental voltage of the 39th phase armature winding sensing；V be armature around
The fundamental voltage virtual value of group sensing；ω=2 π f, f are electric voltage frequency；E1, E2For the sensing fundamental wave electricity of each bar branch road of armature winding
Press sum；P=d/dt；i1And i2Respectively the 1st phase and the 2nd phase armature supply；ifFor exciter current of generator；RrFor every phase electricity
Pivot winding resistance；RfFor generator excitation winding resistance；LfFor generator excitation winding inductance；iFFor exciting current of exciter；
Lf,1For exciter excitation loop and the 1st phase armature winding mutual inductance；Lf,2For energized circuit and the 2nd phase armature winding mutual inductance；L1,1For
1st phase armature winding self-induction；L2,2For the 2nd phase armature winding self-induction；L2,1, L3,1…L39,1Respectively the 2nd phase, the 3rd phase ... the 39th
Phase armature winding and the 1st phase armature winding mutual inductance；L1,2, L3,2…L39,2Respectively the 1st phase, the 3rd phase ..., the 39th phase armature around
Group and the 2nd phase armature winding mutual inductance；LE1, LE2For inductance matrix；Δi1, Δ i2Respectively in the case of failure the 1st, 2 phase armatures around
Group electric current is relative to difference under normal circumstances；Diode k is integer.
Brushless exciter is generally revolving-armature type, i.e. main pole magnetic field is static, and armature is rotated with synchronous speed.Brushless exciter
Number of pole-pairs it is more, the number of phases has point of three-phase and multiphase, with the Alstom 11 of the red nuclear power station along the river of LiaoNing, China to the phase of pole 39 without
Exemplified by brush exciter, parameter is shown in Table 1.
The table 1Alstom phase brushless exciter parameter of 11 pairs of poles 39
Alstom 11 connects a rectifier bridge wall to every phase armature winding in the phase brushless exciter of pole 39, totally 39 bridge arms.
Armature winding uses the form of wave winding, and the connection of each phase winding is as follows：
1st phase：1-6'-12-17'-23-28'
2nd phase：34-39'-45-50'-56-61'
3rd phase：67-72'-78-83'-89-94'
………………
39th phase：85-90'-96-101'-107-112'
Position of the 39 phase armature winding in main field is different, therefore the induced electromotive force phase of each phase winding is not yet
It is identical, the electrical angle of 8 π of adjacent two alternate difference/39.
According to the spatial relation of armature winding, ignore harmonic field, the fundamental wave electricity of 1-39 phases armature winding sensing
Pressure can be represented with following formula：
The armature winding of brushless exciter is similar with the armature winding of direct current generator, for the loop configuration of closure.With it is brushless
The conducting rule of the connected diode of armature of exciter winding is：Any instant, when the induced electricity of a few phase armature winding series connection
When kinetic potential vector sum is maximum in whole armature closeding circuit, 2 diodes being connected with these armature winding both ends are in
Conducting state, whole armature loop are changed into two armature branch circuit parallel connection structures.For example, a certain moment, 2-3-4-5-6 phases armature around
Group series connection electromotive force reaches maximum, and the circuit that the armature winding and generator excitation winding of exciter are formed is shown in Fig. 1.
Ignore the internal resistance of diode, the voltage equation of 2 armature circuits in parallel can be expressed as in Fig. 1：
Wherein：LE1=(Lf,1,L1,1,L2,1,L3,1…L39,1)；LE2=(Lf,2,L1,2,L2,2,L3,2…L39,2)；iE=(iF,
i1,i2…i39)；
39 phase armature winding of brushless exciter are spatially symmetrical, the conducting feelings of other moment armature winding
Condition is similar.
For simplifying the analysis and it is easy to compare, it is assumed that each phase armature supply is close to square wave, the armature electricity only in commutation
Stream has slight fluctuation, and under normal circumstances, the 1st phase and the 2nd phase armature supply are shown in Fig. 2 and Fig. 3 to diode.
1st phase and the 2nd phase armature supply can be using approximate representations as (other each 8 π that mutually stagger successively/39 electrical angle)：
It is assumed that open fault occurs for the rotating diode of Bridge 1 upper half bridge arm, failure diode only influences what is be attached thereto
The electric current of 1st phase and the 2nd phase armature winding, the waveform of this biphase current are shown in Fig. 4 and Fig. 5.
Compared with the armature supply waveform under diode normal condition：The ON time of 1st phase armature supply positive half period
Reduce the electrical angle of 4 π/39, the ON time of negative half-cycle increases the electrical angle of 4 π/39；The conducting of 2nd phase armature supply positive half period
Time increases the electrical angle of 4 π/39, and the ON time of negative half-cycle reduces the electrical angle of 4 π/39.1st phase and the 2nd phase armature winding
Electric current can be expressed as：
Remaining 37 phase armature supply does not have significant difference in normal and malfunction.
1st, 2 phase armature winding electric currents are shown in Fig. 6 and Fig. 7 relative to difference waveform under normal circumstances.
The difference waveform can using approximate representation as：
Δi1The π (7) of=- 2I 2k π≤ω t ＜ 2k π+4/39
Δi2+ 4/39 π of=2I 2k π≤π (8) of ω t ＜ 2k π+8/39
The exception of armature supply would further cause the change of armature mmf.In (0+k π, 4 π/39+k π) the failure period, electricity
The change of pivot winding magnetic potential is mainly as caused by the change of the 1st phase armature supply；In (4 π/39+k π, 8 π/39+k π) the failure period,
The change of armature winding magnetic potential is mainly as caused by the change of the 2nd phase armature supply.
Armature winding is circumferentially deployed, in diode under normal circumstances, each cell current distribution such as Fig. 8, figure in A, B period
Shown in 9.In the case of Bridge 1 upper half bridge arm diode open-circuit, each cell current is distributed as shown in Figure 10, Figure 11 in A, B period.
In the A periods：
Armature mmf is obtained according to each cell current of Fig. 8 diodes under normal circumstances, as shown in figure 12；According to Figure 10 the 1st
Each cell current in the case of bridge upper half bridge arm diode open-circuit failure obtains armature mmf, as shown in figure 13.Failure armature mmf
See Figure 14 relative to the increment of normal armature mmf, as seen from Figure 14, influenceed by Bridge 1 upper half bridge arm diode open-circuit,
Local relatively low area in armature mmf increment waveform be present.
In the B periods：
Armature mmf is obtained according to each cell current of Fig. 9 diodes when normal, as shown in figure 15；According on Figure 11 Bridge 1s
Each cell current during half bridge arm diode open-circuit failure obtains armature mmf, as shown in figure 16.Failure armature mmf is relative to just
The increment of normal armature mmf is shown in Figure 17, it can be seen that is influenceed by Bridge 1 upper half bridge arm diode open-circuit, armature mmf increment ripple
Local higher area in shape be present.
Armature often turns over a pair of magnetic poles, and the abnormal conditions that 1 part is relatively low, 1 part is higher occurs in armature mmf increment.
Armature rotates a circle, and armature mmf will appear from the abnormal conditions that 11 parts are relatively low and 11 parts are higher.
To detect the rotating diode open fault of brushless exciter, the iron yoke between brushless excitation machine stator adjacent pole
On make a call to 2 radial direction through holes vertically, magnetic-field measurement coil is installed in stator iron yoke through the two holes, sees Figure 18.
Influenceed by armature field, through magnetic-field measurement coil magnetic flux also by periodically-varied, in magnetic-field measurement coil
Upper induced voltage, the voltage reflect the magnetic flux change through magnetic-field measurement coil.
On Bridge 1 under half-bridge wall rotating diode open circuit situation, armature rotates a circle, and armature mmf will appear from 11 offices
Portion is recessed and the abnormal conditions of 11 local crownings.The local dent of magnetic potential and convex area are moved with the rotation of armature winding
Dynamic, only when its is inswept is fixed on the magnetic-field measurement coil in stator iron yoke, the induced voltage of magnetic-field measurement coil just occurs one
Secondary part is less than normal and once local phenomenon bigger than normal, i.e., occur in induced voltage with speed (25Hz) identical harmonic wave into
Point, the voltage of this frequency is that diode is unexistent when normal, and therefore, the coil-induced 25Hz voltages of magnetic-field measurement can be made
For the criterion of brushless exciter rotating diode open fault.
For the validity of verification method, brushless exciter in table 1 is established using electromagnetic field numerical simulation software Maxwell
Two dimensional model, model is imported into Simplorer softwares, rotating rectifier model is built in Simplorer, must be shown up
Road couple electromagnetic simulation model, magnetic-field measurement coil are set as 9.6cm, wide 5cm along brushless exciter axial length.
Set rotating diode normally respectively and the rotating diode of Bridge 1 upper half bridge arm is opened a way, obtain the 1st, 2 phase armatures
Winding current, as illustrated in figures 19 and 20.
It can see from Figure 19 and Figure 20, armature supply is more smooth, and this is derived from the smoothing effect of armature winding inductance.
Under the rotating diode open-circuit condition of Bridge 1 upper half bridge arm, the positive half period of the 1st phase armature supply has when normal compared with diode
Obvious missing, and substantially broaden when the negative half-cycle of the 1st phase armature supply is normal compared with diode；2nd phase armature supply is just
Half period has when normal compared with diode significantly to broaden, and obvious when the negative half-cycle of the 2nd phase armature supply is normal compared with diode
Missing, these features and theory analysis are identical.
Magnetic flux through magnetic-field measurement coil is obtained according to exciter main field, magnetic-field measurement coil is obtained by differential
Induced voltage, as shown in figure 21 and figure.
In Figure 21 and Figure 22, when the rotating diode of Bridge 1 upper half bridge arm is opened a way, the induced voltage phase of magnetic-field measurement coil
It is varied from when all normal to rotating diode, but can not be effectively distinguished from time domain waveform.Sense to magnetic-field measurement coil
Answer voltage to carry out Fourier transformation, obtain each harmonic voltage magnitude, see Figure 23, Figure 24, Figure 25 and Figure 26.
When rotating diode is normal, the amplitude of the coil-induced 25Hz component of voltages of magnetic-field measurement is smaller；When Bridge 1 upper half
During the rotating diode open circuit of bridge arm, the coil-induced 25Hz component of voltage amplitudes of magnetic-field measurement significantly increase, with theory analysis
It coincide.
The rotating diode failure and the rotating diode fault signature of Bridge 1 of remaining 38 bridge wall of brushless exciter be
Exactly the same, and the diode open-circuit failure of upper half bridge arm and the diode open-circuit fault signature of lower half bridge arm are also identical
, therefore, this method is applied to the diagnosis of any one phase, the diode open-circuit failure of any bridge wall.Fault characteristic frequency is with turning
Rotor speed is related, when the rated speed of brushless exciter is 1500 revs/min, fault characteristic frequency 25Hz；Work as brushless excitation
When the rated speed of machine is 3000 revs/min, the frequency of failure criterion is 50Hz.
The present invention proposes the magnetic-field measurement coil of the punching installation appearance insulation in brushless excitation machine stator iron yoke, utilizes magnetic
The open fault of the harmonic amplitude change detection rotating diode of specific frequency in the coil-induced voltage of field measurement, and by limited
First simulating, verifying validity of novel detection method.Magnetic-field measurement coil used in the present invention is installed simply, conveniently, and cost
Low, fixation is reliable, with small vibration in running, and coil does not interfere with to the normal operation of brushless exciter.This method
It can be widely applied to the on-line checking of brushless exciter rotating diode open fault.
In the description of the invention, it is to be understood that term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " is based on accompanying drawing institutes
The orientation or position relationship shown, the description present invention is for only for ease of, rather than the device or element of instruction or hint meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (3)
- A kind of 1. brushless exciter rotating diode open fault inline diagnosis method, it is characterised in that：Determine in brushless exciter 2 radial direction through holes are made a call in iron yoke between sub- adjacent pole vertically, magnetic field survey is installed by the two holes in stator iron yoke Coil is measured, in brushless exciter running, the induced voltage of the coil is gathered using data collecting instrument, and the voltage is entered The real-time Fourier transformation of row, obtain with armature speed identical harmonic voltage amplitude, by the value compared with fault threshold, When the value exceedes fault threshold, judge that open fault occurs in brushless exciter rotating diode.
- 2. brushless exciter rotating diode open fault inline diagnosis method according to claim 1, it is characterised in that： When brushless exciter rated speed be 1500 revs/min, fault characteristic frequency 25Hz；When the rated speed of brushless exciter is 3000 revs/min, fault characteristic frequency 50Hz.
- 3. brushless exciter rotating diode open fault inline diagnosis method according to claim 1, it is characterised in that： Fault threshold is set as 0.02V.
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| CN111983419A (en) * | 2020-08-31 | 2020-11-24 | 清华大学 | Method and system for detecting a multiphase brushless exciter rectifier diode fault |
| CN112034344A (en) * | 2020-09-09 | 2020-12-04 | 北京华科同安监控技术有限公司 | Real-time online diagnosis method for turn-to-turn short circuit fault of rotor winding of hydraulic generator |
| WO2021114507A1 (en) * | 2019-12-12 | 2021-06-17 | 南京南瑞继保电气有限公司 | Online fault detection method and device for armature side of brushless exciter |
| CN113311307A (en) * | 2021-05-28 | 2021-08-27 | 华北电力大学（保定） | Diode open-circuit fault detection method for three-phase brushless exciter rotating rectifier |
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