CN1808161A - Method and apparatus for asynchronous motor fault diagnosis for beam-pumping unit - Google Patents
Method and apparatus for asynchronous motor fault diagnosis for beam-pumping unit Download PDFInfo
- Publication number
- CN1808161A CN1808161A CN 200610008309 CN200610008309A CN1808161A CN 1808161 A CN1808161 A CN 1808161A CN 200610008309 CN200610008309 CN 200610008309 CN 200610008309 A CN200610008309 A CN 200610008309A CN 1808161 A CN1808161 A CN 1808161A
- Authority
- CN
- China
- Prior art keywords
- asynchronous machine
- voltage
- driver element
- switch
- asynchronous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to a method and a device for diagnosing accidents of an asynchronous motor in walking beam pumping unit. The diagnosing method comprises steps of: 1. controlling the asynchronous motor enter pre-defined accident diagnosing mode when the asynchronous motor in generating status, and cutting off the asynchronous motor from the electricity network; 2. implementing accident synthesis diagnosing according to the collected voltage and current data of the asynchronous motor by the data collection unit with computer controller; 3. connecting the asynchronous motor with the electricity when entering active status. The diagnosing device comprises: a diagnosing switch connected in the circuit of the asynchronous motor and the alternative current power, and a driving unit, computer controller and a data collection unit which are connected in sequence.
Description
Technical field
The present invention relates to the oil exploitation mechanical field, relate in particular to a kind of asynchronous motor of walking-beam pumping unit method for diagnosing faults and diagnostic device based on the isolated island generation technology.
Background technology
Squirrel cage asynchronous motor is widely used at industrial circle especially petroleum industry, understands its duty at any time, avoids hindering for some reason and cause accident to have crucial meaning.Repair based on condition of component must be based upon on the reliable fault diagnosis basis, and scholars have proposed many fault diagnosis means for this reason, and wherein current monitoring method is comparatively general.Faults such as disconnected bar of asynchronous machine rotor and end ring cracking can produce frequency in stator current be fundamental frequency (1-2s) extra current component (s is a revolutional slip) doubly, people have carried out a large amount of fruitful researchs to this, existent method comprises frequency spectrum analysis methods such as wavelet analysis, Fourier conversion, Park vector, expansion Park vector, d-q coordinate system, M-T coordinate system, Hilbert conversion at present, but said method all makes diagnostic result be difficult to meet the demands because of the signal that obtains is undesirable.
Prior art has proposed to utilize the electric motor starting electric current to carry out the technical scheme of fault diagnosis, obtain problem though can separate the sleeve signal, but signal still is subjected to the interference of power supply and load, and work as the electric motor starting time more in short-term, analyze quite difficulty, can not satisfy online requirement, can not satisfy the real-time fault diagnosis requirement of motor.
Prior art has also proposed to utilize the technical scheme that the residual voltage of stator winding is analyzed after the motor dead electricity, and uses it for the diagnosing motor rotor bar breaking fault.Before and after the asynchronous machine dead electricity, the frequency of set end voltage will take place to change suddenly, and along with the decay of rotor winding current and the decline of motor speed, the dead electricity voltage attenuation is faster, too narrow this method that makes of useful signal window has increased the difficulty that is difficult for overcoming, and can not satisfy online requirement and to the real-time fault diagnosis requirement of motor.
Therefore, the outstanding problem of carrying out electrical fault diagnosis at present shows:
(1) fluctuation of load influence: the load that asynchronous machine dragged is jiggly sometimes, and the swing of load distorts stator current;
(2) power supply influence: motor is carried out fault diagnosis be subjected to that power supply is incomplete to be influenced,, voltage fluctuation asymmetric etc. as the supply voltage three-phase;
(3) the useful signal window is little: the decline of the decay of rotor winding current and motor speed after the motor dead electricity;
(4) characteristic signal is faint: when rotor had minor failure, the size of failure-frequency component was very little with respect to the ratio of fundamental frequency component in the stator current, if motor when running on underloading its ratio littler, and because motor slip ratio s is very little, so (1-2s) f
1With fundamental frequency f
1More approaching, this brings difficulty to signal Processing, makes diagnostic sensitivity descend, and therefore present extensive work based on the research of stator current fault diagnosis is how to extract faint characteristic signal.
How to get rid of undesired signal from the electric system and the fluctuation of load, do not influencing under the operate as normal prerequisite of oil pumper, obtain the window adjustable signal under the various operating modes, online, correctly diagnose the fault such as stator winding, rotor winding of oil pumper asynchronous machine in real time, be a great problem on the current techniques.
Summary of the invention
First purpose of the present invention is to be subjected to load, power-supply fluctuation to influence, can't obtain technical matterss such as window adjustable signal under the various operating modes at prior art electrical fault diagnosis, a kind of asynchronous motor of walking-beam pumping unit method for diagnosing faults based on the isolated island generation technology is provided, be in the parameter of asynchronous machine under the isolated island generator operation state by detection, make fault diagnosis of the present invention not influenced by load, power-supply fluctuation, the while can obtain the window adjustable signal under the various operating modes and satisfy the inline diagnosis requirement.
Second purpose of the present invention is on asynchronous motor of walking-beam pumping unit method for diagnosing faults of the present invention basis, and a kind of asynchronous motor of walking-beam pumping unit trouble-shooter based on the isolated island generation technology is provided.
For realizing first purpose of the present invention, the invention provides a kind of asynchronous motor of walking-beam pumping unit method for diagnosing faults, comprise step:
When step 20, computer control judged that according to described voltage and current data asynchronous machine enters generating state, the output control signal was given driver element;
Described step 30 can be an asynchronous machine dead electricity diagnostic mode workflow, it also can be asynchronous machine self-excitation diagnostic mode workflow, can also be that asynchronous machine is often encouraged the diagnostic mode workflow, can also further be that the diagnostic mode workflow is encouraged in the asynchronous machine mistake.
For realizing second purpose of the present invention, the present invention also provides a kind of asynchronous motor of walking-beam pumping unit trouble-shooter, comprise the diagnosis switch that is connected on asynchronous machine and the ac power supply circuit, described diagnosis switch is connected with its driver element that is switched on or switched off of control, described driver element and one sends the computer control that is switched on or switched off control signal and is connected, and the data acquisition unit that described computer control and is gathered asynchronous machine voltage and current data is connected; Described computer control comprises soft instrument unit and the failure diagnosis unit that is connected with control module respectively, described soft instrument unit is connected with described data acquisition unit, be used for active power value and/or rotating speed according to the voltage and current data computation asynchronous machine that receives, described failure diagnosis unit is connected with described data acquisition unit, be used for carrying out fault diagnosis according to the frequency spectrum of the voltage and current data that receive, described control module is connected with described driver element, and the control asynchronous machine enters predefined fault diagnosis model and enters generating, motoring condition.Further, a described AC power generating effect capacitors also in parallel, described asynchronous machine also connects the pseudo-load and the frequency-and voltage-stabilizing circuit of a serial connection.
In technique scheme, described asynchronous machine can connect the self-excitation switch and the open-circuit excitation capacitor of a serial connection, can also connect often encouraging switch and often encouraging load of a serial connection, can also connect further that switch is encouraged in a mistake that is connected in series and load is encouraged in mistake, or the combination in any of such scheme.Described self-excitation switch, lose and to encourage switch and often to encourage switch and is connected with described driver element respectively, described often encourage load also parallel connection one often encourage electric capacity.
The invention provides a kind of asynchronous motor of walking-beam pumping unit method for diagnosing faults and diagnostic device of novel concept based on the isolated island generation technology, fault diagnosis is arranged on the generating state stage of asynchronous machine and electrical network disengagement, both utilized the asynchronous machine of normal operation to have the induction voltage and current to produce the energy that generates electricity when making full use of asynchronous machine isolated island generating state again at generating state stage stator winding.Normal asynchronous machine in service has induced voltage to produce and the electric current generation at the stator winding of generating state, when rotating speed surpasses critical rotary speed, asynchronous machine is become by unloaded isolated island generator operation the isolated island generator operation of carrying, and pseudo-load and frequency-and voltage-stabilizing circuit release energy and rotating speed is adjusted to safe range.When the asynchronous machine rotor winding failure, the various frequency spectrums that utilize the voltage and current signal under the various operating conditions of isolated island generating to obtain through wavelet analysis method can the diagnosing motor fault.The fault signature harmonic components can carry out Theoretical Calculation in advance, thus in the practical application for diagnosing more accurately, the frequency spectrum and the historical spectrum data of the voltage and current of isolated island generating can be compared, thereby make correct diagnosis.
Since the present invention when carrying out fault diagnosis asynchronous machine disconnect from electrical network, so the voltage and current data of asynchronous machine can not be subjected to the incomplete influence of power supply under this state, asymmetric as the supply voltage three-phase, contain various harmonic waves, voltage fluctuation etc.; Voltage and current owing to asynchronous machine under this state is to measure from itself simultaneously, so data can not be subjected to the influence of load, as load size, load characteristic, fluctuation situation etc.Compared with prior art, the present invention has eliminated the various unfavorable interference in the fault diagnosis basically, and fault diagnosis result has higher confidence level, satisfies online requirement simultaneously, can carry out fault diagnosis at any time and does not influence the operate as normal of asynchronous machine.
The present invention also artificially adjusts the time that asynchronous machine is in generating state by adjusting generating effect capacitors capacity, make the present invention have adjustable data window, can obtain the adjustable window signal under the various possibility operating modes, efficiently solve the young technical matters of prior art data acquisition window.
The present invention is provided with the fault diagnosis model of four kinds of asynchronous machines according to the possible various operating conditions of asynchronous machine, is respectively asynchronous machine dead electricity, self-excitation, often encourages and diagnostic mode is encouraged in mistake.Consider that the real system generating state time is not long, therefore the generating state in a working cycle of asynchronous machine can only carry out the diagnosis of a pattern in the time.Therefore the invention allows for the diagnosis loop concept, 4 working cycle with asynchronous machine are a diagnosis circulation of the present invention, carry out the diagnosis of above-mentioned four kinds of fault diagnosis models in time successively at each diagnosis round-robin generating state, and gather the diagnostic result of various fault diagnosis models, the frequency spectrum of asynchronous machine terminal voltage and stator winding electric current (line current) in each process of the various operating modes of synthetic study, obtain the diagnostic result that confidence level is higher, accuracy is higher, thereby make the present invention have extensive applicability and application prospect.The present invention also is applicable to other field the asynchronous machine of any power driven system with potential energy load or the fault diagnosis of other type motor.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the process flow diagram of asynchronous motor of walking-beam pumping unit method for diagnosing faults of the present invention;
Fig. 2 is the workflow diagram of asynchronous machine dead electricity diagnostic mode of the present invention;
Fig. 3 is the workflow diagram of asynchronous machine self-excitation diagnostic mode of the present invention;
Fig. 4 often encourages the workflow diagram of diagnostic mode for asynchronous machine of the present invention;
Fig. 5 loses the workflow diagram of encouraging diagnostic mode for asynchronous machine of the present invention;
Fig. 6 enters the process flow diagram of generating state for the present invention judges asynchronous machine;
Fig. 7 enters the process flow diagram of motoring condition for the present invention judges asynchronous machine;
Fig. 8 realizes the process flow diagram of asynchronous machine safe speed of rotation control for the present invention;
The process flow diagram that Fig. 9 sets for parameter value of the present invention;
Figure 10 is an asynchronous machine dead electricity diagnostic mode preferred version process flow diagram of the present invention;
Figure 11 is asynchronous machine self-excitation diagnostic mode preferred version process flow diagram of the present invention;
Figure 12 often encourages diagnostic mode preferred version process flow diagram for asynchronous machine of the present invention;
Figure 13 encourages diagnostic mode preferred version process flow diagram for asynchronous machine of the present invention loses;
Figure 14 diagnoses the round-robin process flow diagram for the present invention;
Figure 15 is an asynchronous motor of walking-beam pumping unit trouble-shooter structural representation of the present invention;
Figure 16 is the structural representation of asynchronous machine dead electricity diagnostic mode of the present invention;
Figure 17 is a frequency-and voltage-stabilizing circuit diagram of the present invention;
Figure 18～Figure 19 is a frequency-and voltage-stabilizing circuit working synoptic diagram of the present invention;
Figure 20 is the structural representation of asynchronous machine self-excitation diagnostic mode of the present invention;
Figure 21 often encourages the structural representation of diagnostic mode for asynchronous machine of the present invention;
Figure 22 loses the structural representation of encouraging diagnostic mode for asynchronous machine of the present invention;
Figure 23 is an asynchronous motor of walking-beam pumping unit trouble-shooter fundamental diagram of the present invention;
Figure 24 is an asynchronous motor of walking-beam pumping unit trouble-shooter circuit diagram of the present invention.
Description of reference numerals:
The 1-ac power switch; The 2-AC power; The 3-switch;
The former control system switch of 4-; The 5-asynchronous machine; The 6-switch;
The 7-switch; The 8-current transformer; 9-oil pumper mechanical system;
10-diagnoses switch; The 11-current transformer; The 12-switch of encouraging oneself;
13-open-circuit excitation capacitor; The 14-voltage transformer (VT); 15-loses and encourages switch;
16-loses and encourages load; The 17-data acquisition unit; The pseudo-load switch of 18-;
19-often encourages electric capacity; The 20-driver element; The 21-computer control;
22-often encourages switch; 23-often encourages load; The 24-DC power supply switch;
25-direct supply and holding circuit; The 26-effect switch that generates electricity; The 27-current transformer;
The 28-effect capacitors that generates electricity; The pseudo-load of 29-; 30-frequency-and voltage-stabilizing circuit;
The 211-control module; 212-soft instrument unit; The 213-failure diagnosis unit.
Embodiment
Fig. 1 is the process flow diagram of asynchronous motor of walking-beam pumping unit method for diagnosing faults of the present invention, comprises step:
When step 20, computer control judged that according to described voltage and current data asynchronous machine enters generating state, the output control signal was given driver element;
The present invention is directed to the generator operation characteristic of the oil pumper asynchronous machine that uses in the oil field, proposed a kind of method for diagnosing faults of novel concept, fault diagnosis is arranged on the generating state stage of asynchronous machine and electrical network disengagement.The present invention is divided into two stages with the operation in dust cycle of asynchronous machine: motoring condition stage and generating state stage.In the asynchronous machine motoring condition stage, judge the zero hour of asynchronous machine generating state by the voltage and current instantaneous value of gathering the asynchronous machine operation, the control asynchronous machine enters predefined fault diagnosis model when asynchronous machine enters generating state, and asynchronous machine disconnected from electrical network, the frequency spectrum of the voltage and current data by gathering asynchronous machine under this fault diagnosis model carries out fault diagnosis; The control asynchronous machine withdraws from fault diagnosis model when asynchronous machine enters motoring condition, and asynchronous machine dropped into electrical network, asynchronous machine is got back to the motoring condition stage, so goes round and begins again, and promptly forms the asynchronous motor of walking-beam pumping unit method for diagnosing faults that the present invention is based on the isolated island generation technology.The core body of technique scheme of the present invention is arranged on fault diagnosis the generating state stage of asynchronous machine now, because this moment, asynchronous machine disconnected from electrical network, so it is the voltage and current data of asynchronous machine can not be subjected to the incomplete influence of power supply under this state, asymmetric as the supply voltage three-phase, contain various harmonic waves, voltage fluctuation etc.; Voltage and current owing to asynchronous machine under this state is to measure from itself simultaneously, so data can not be subjected to the influence of load, as load size, load characteristic, fluctuation situation etc.Compared with prior art, the present invention has eliminated the various unfavorable interference in the fault diagnosis, and diagnostic result has higher confidence level, satisfies online requirement simultaneously, can carry out fault diagnosis at any time and does not influence the operate as normal of asynchronous machine.The present invention simultaneously has that fault diagnosis is accurate, dynamic response is fast, simple in structure, characteristics such as system is reliable.The present invention also artificially adjusts the time that asynchronous machine is in generating state by adjusting generating effect capacitors capacity, make the present invention have adjustable data window, can obtain the adjustable window signal under the various possibility operating modes, efficiently solve the young technical matters of prior art data acquisition window.
In technique scheme, the present invention is provided with the fault diagnosis model of four kinds of asynchronous machines according to the possible various operating conditions of asynchronous machine, be respectively: (1) asynchronous machine dead electricity diagnostic mode, (2) asynchronous machine self-excitation diagnostic mode, (3) asynchronous machine are often encouraged diagnostic mode and (4) asynchronous machine and are lost and encourage diagnostic mode, in a generating state interval of asynchronous machine, only carry out the diagnosis of a pattern, utilize wavelet analysis method can realize the fault diagnosis of asynchronous machine, illustrated one by one below.
Fig. 2 is the workflow diagram of asynchronous machine dead electricity diagnostic mode of the present invention.Electric current and voltage data when asynchronous machine dead electricity diagnostic mode can provide normal load to suddenly disappear are specially:
Fig. 3 is the workflow diagram of asynchronous machine self-excitation diagnostic mode of the present invention.Asynchronous machine self-excitation diagnostic mode can provide stable voltage to set up process and stable state high pressure and no-load current data, is specially:
The closed self-excitation of step 322, driver element switch is set up being connected of open-circuit excitation capacitor and asynchronous machine, and what driver element control diagnosis switch disconnected asynchronous machine and AC power is connected asynchronous machine and open-circuit excitation capacitor formation isolated island electricity generation system;
When step 324, computer control judged that according to described voltage and current data asynchronous machine enters motoring condition, the output control signal was given driver element.
Fig. 4 often encourages the workflow diagram of diagnostic mode for asynchronous machine of the present invention.This diagnostic mode can provide by zero load to adding the transient state of often encouraging load electric current and the voltage data to two stages of steady-state process, is specially:
When step 334, computer control judged that according to described voltage and current data asynchronous machine enters motoring condition, the output control signal was given driver element.
Fig. 5 loses the workflow diagram of encouraging diagnostic mode for asynchronous machine of the present invention.Diagnostic mode is encouraged in the asynchronous machine mistake can provide big transient voltage of rate of change and big current vanishes process data, is specially:
(1) asynchronous machine dead electricity diagnostic mode: closed diagnosis switch, the recovery asynchronous machine is connected with AC power;
(2) asynchronous machine self-excitation diagnostic mode: at first disconnect the self-excitation switch, excision open-circuit excitation capacitor, closed then diagnosis switch recovers being connected of asynchronous machine and AC power;
(3) asynchronous machine is often encouraged diagnostic mode: at first disconnect and often encourage switch, load is often encouraged in excision, disconnects the self-excitation switch then, and last closed diagnosis switch recovers being connected of asynchronous machine and AC power;
(4) asynchronous machine loses and to encourage diagnostic mode: at first disconnect losing and encourage switch, excision is lost and is encouraged load, disconnects the self-excitation switch then, and last closed diagnosis switch recovers being connected of asynchronous machine and AC power.
In three kinds of diagnostic modes shown in Fig. 3 of the present invention～5, at first closed self-excitation switch input open-circuit excitation capacitor can be accelerated it and build the pressure process, makes the Diagnostic Time lengthening, helps data acquisition and quality of diagnosis.Certainly, in actual use, technique scheme of the present invention also can be arranged to disconnect the diagnosis switch earlier, and asynchronous machine is thrown off from electrical network, and closed again self-excitation switch drops into the open-circuit excitation capacitor.
Fig. 6 enters the process flow diagram of generating state for the present invention judges asynchronous machine.The present invention judges the starting point moment of generating state by its active power value of voltage and current data computation of asynchronous machine by active power value zero crossing.Therefore the step 20 in the technical scheme shown in Figure 1 is specially:
Fig. 7 enters the process flow diagram of motoring condition for the present invention judges asynchronous machine.In Fig. 3, technical scheme shown in Figure 4, the present invention adopts the soft metering system of the online noncontact of asynchronous machine rotating speed to realize that asynchronous machine enters motoring condition judgement constantly, promptly judges generating state finish time by this rotating speed near the asynchronous machine synchronous rotational speed.Step 324, step 334 in Fig. 3, the technical scheme shown in Figure 4 are specially:
The soft instrument unit of step 3241, computer control is according to the rotating speed of the voltage and current data computation asynchronous machine of asynchronous machine, and calculates the difference of described rotating speed and asynchronous machine synchronous rotational speed;
Step 3242, when described difference during less than preset difference value, computer control judges that asynchronous machine begins to enter motoring condition;
Step 3243, computer control output control signal are given driver element.
Fig. 8 realizes the process flow diagram of asynchronous machine safe speed of rotation control for the present invention.In Fig. 2～technical scheme shown in Figure 5, after carrying out fault diagnosis, described computer control also comprises the step of a pseudo-load that is connected with asynchronous machine and frequency-and voltage-stabilizing circuit control asynchronous machine safe speed of rotation, be specially:
The no-load voltage of step 301, frequency-and voltage-stabilizing circuit monitoring asynchronous machine;
The asynchronous machine no-load voltage is directly proportional with rotating speed, this value is higher than default safety critical voltage and just means that the rotating speed of asynchronous machine is above the safety critical rotating speed, need to discharge the stored energy of asynchronous machine, its rotating speed is reduced in the default safety critical range of speeds by the frequency-and voltage-stabilizing circuit.Technique scheme of the present invention efficiently solves asynchronous machine rotating speed problem out of control, has improved exploitativeness of the present invention and reliability.
Parameters such as the asynchronous machine synchronous rotational speed that relates in the technique scheme of the present invention, safety critical rotating speed, delay time all obtain by the parameter value setting process, and set in advance in computer control.Certainly, also execution parameter initial value setting process repeatedly in the operational process of the present invention to adapt to the fault diagnosis to asynchronous machine under varying environment, the different operating mode, makes the setting of important parameter more accurate.
The process flow diagram that Fig. 9 sets for parameter value of the present invention is specially:
Step 100, data acquisition unit are gathered the transient data of asynchronous machine working voltage and electric current in real time, and give computer control with data delivery;
Step 110, computer control be according to oil pumper dust cycle data, determines the parameter value in dust cycle of asynchronous machine: asynchronous machine is in time and the starting point that time of motoring condition and starting point, asynchronous machine are in generating state;
Step 120, computer control judge whether the asynchronous machine generating state time satisfy the fault diagnosis requirement, are execution in step 140 then, otherwise execution in step 130;
Step 130, the adjustment generating effect capacitors capacity in parallel with AC power, execution in step 100;
Step 140, preservation parameter value, setting finishes.
Such scheme is artificially adjusted asynchronous machine by adjustment generating effect capacitors capacity and is in the generating state time, make the present invention have adjustable diagnostic data window, can obtain the adjustable window signal under the various possibility operating modes, efficiently solve the prior art factor according to the little technical matters of acquisition window.
Figure 10～13 are respectively asynchronous machine dead electricity of the present invention, self-excitation, often encourage and diagnostic mode preferred version process flow diagram is encouraged in mistake, should shown in technical scheme be that technical scheme by Fig. 2～5 is combined to form with technical scheme shown in Fig. 1, Fig. 6～8 respectively, aforementioned its flow process that describes in detail repeats no more here.
On technical scheme basis shown in Figure 10～13, the invention allows for the diagnosis loop concept, 4 working cycle with asynchronous machine are a diagnosis circulation, carry out above-mentioned four kinds of fault diagnosis models in time successively at each diagnosis round-robin generating state, utilize the frequency spectrum of asynchronous machine terminal voltage and stator winding electric current (line current) in each process of each operating mode of wavelet analysis method synthetic study, and gather the diagnostic result of each fault diagnosis model.Figure 14 is specially for the present invention diagnoses the round-robin process flow diagram:
Steps A, dead electricity diagnostic mode workflow: execution in step 10,20,311～314,40;
Step B, self-excitation diagnostic mode workflow: execution in step 10,20,321～324,40;
Step C, often encourage the diagnostic mode workflow: execution in step 10,20,331～334,40;
The diagnostic mode workflow is encouraged in step D, mistake: execution in step 10,20,341～344,40, return execution in step A.
The present invention diagnoses the round-robin technical scheme can obtain the diagnostic result that confidence level is higher, accuracy is higher, thereby makes the present invention have extensive applicability and application prospect.
Figure 15 is an asynchronous motor of walking-beam pumping unit trouble-shooter structural representation of the present invention, and thick line is represented the forceful electric power circuit among the figure, and fine rule is represented the light current circuit.As shown in figure 15, asynchronous motor of walking-beam pumping unit trouble-shooter of the present invention comprises computer control 21, driver element 20, data acquisition unit 17, diagnosis switch 10.Wherein, diagnosis switch 10 is serially connected in the loop of AC power 2 and asynchronous machine 5, is responsible for switching on and off of asynchronous machine 5 and AC power 2; Driver element 20 connects computer control 21 and diagnosis switch 10 respectively, and receiving computer controller 21 sends switches on and off control signal, and control diagnosis switch 10 switches on and off action; 17 voltage and current instantaneous values of being responsible for gathering asynchronous machine 5 of data acquisition unit, and send the data to computer control 21.
In technique scheme of the present invention, computer control 21 is according to the various operating conditions of asynchronous machine, be provided with the fault diagnosis model of four kinds of asynchronous machines, be respectively: (1) asynchronous machine dead electricity diagnostic mode, (2) asynchronous machine self-excitation diagnostic mode, (3) asynchronous machine are often encouraged diagnostic mode and (4) asynchronous machine and are lost and encourage diagnostic mode, utilize wavelet analysis method to study the frequency spectrum of asynchronous machine terminal voltage and stator winding electric current (line current) in each process, can realize the resultant fault diagnosis of asynchronous machine.The present invention provides the corresponding techniques scheme according to above-mentioned four kinds of fault diagnosis models, is illustrated one by one below.
Figure 16 is the structural representation of asynchronous machine dead electricity diagnostic mode of the present invention.In this diagnostic mode technical scheme, computer control 21 comprises control module 211, soft instrument unit 212 and failure diagnosis unit 213.Soft instrument unit 212 is connected with data acquisition unit 17 with control module 211 respectively, is used for receiving the voltage and current data from data acquisition unit 17, calculates the active power value and/or the rotating speed of asynchronous machine, and result of calculation is sent to control module 211; Failure diagnosis unit 213 is connected with data acquisition unit 17 with control module 211 respectively, be used for receiving the voltage and current data from data acquisition unit 17, frequency spectrum according to the voltage and current data carries out fault diagnosis, and fault diagnosis result is sent to control module 211; Control module 211 also is connected with driver element 20, and control asynchronous machine 5 enters the fault diagnosis model of setting and by driver element 20 control diagnosis switches 10 on/off, makes asynchronous machine 5 enter motoring condition/generating state.
As shown in figure 16, in this diagnostic mode technical scheme, AC power 2 a generating effect capacitors 28 also in parallel, be used for when asynchronous machine is in generating state time domain data window and can not fully carries out fault diagnosis, by adjusting the capacity of generating effect capacitors 28, the artificial asynchronous machine of adjusting is in the generating state time, till satisfying the requirement of fault diagnosis data window.Fault diagnosis in service remain unchanged of generating effect capacitors 28 before the present invention carries out learning phase next time.Asynchronous machine 5 also connects the pseudo-load 29 and the frequency-and voltage-stabilizing circuit 30 of a serial connection, be used for when asynchronous machine 5 rotating speeds are higher than critical rotary speed, controllable silicon conducting by frequency-and voltage-stabilizing circuit 30, unloaded isolated island electricity generation system is become have and carries an isolated island electricity generation system, with the rotating speed of asynchronous machine be reduced to satisfy in the safe speed of rotation scope till.
As shown in figure 16, the course of work of this diagnostic mode technical scheme is:
(A-I) asynchronous machine 5 energising operates under the motoring condition, the voltage and current instantaneous value when data acquisition unit 17 is gathered asynchronous machines 5 operations in real time, and send data to soft instrument unit 212; Soft instrument unit 212 calculates the active power value of asynchronous machine 5, and result of calculation is sent to control module 211; Control module 211 is judged time and the starting point that asynchronous machine 5 enters generating state by active power value zero crossing, to driver element 20 output control signals;
(A-II) control module 211 control drive unit 20 disconnect diagnosis switch 10, and cut-out asynchronous machine 5 is connected with AC power 1, makes asynchronous machine 5 be in power failure state;
(A-III) data acquisition unit 17 is gathered the voltage and current instantaneous value in this process of asynchronous machine in real time, and is transferred to failure diagnosis unit 213, and failure diagnosis unit 213 is carried out fault diagnosis according to the frequency spectrum of voltage and current data;
(A-IV) frequency-and voltage-stabilizing circuit 30 is monitored the no-load voltage of asynchronous machine automatically, when no-load voltage during greater than default safety critical voltage, the controllable silicon conducting of frequency-and voltage-stabilizing circuit 30, pseudo-load 29 consumes overcritical energy, in the time of in no-load voltage is reduced to default safety critical voltage range, the controllable silicon of frequency-and voltage-stabilizing circuit 30 turn-offs;
(A-V) control module 211 promptly begins automatic time delay after asynchronous machine 5 enters generating state, time-delay finishes back output control signal to driver element 20, driver element 20 control diagnosis switches 10 closures insert electrical network with asynchronous machine 5, make asynchronous machine 5 be in the motoring condition of energising operation.
(A-VI) repeated execution of steps (A-I), the working cycle of formation asynchronous machine dead electricity diagnostic mode.
The electric current and the voltage data of asynchronous machine when this diagnostic mode can provide normal load to suddenly disappear, through wavelet analysis method can the diagnosing motor rotor winding failure.Step (IV) mainly plays the effect out of control of control asynchronous machine 5 rotating speeds, the too high rotating speed of asynchronous machine 5 that means of the no-load voltage of asynchronous machine surpasses the safety critical rotating speed, controllable silicon conducting by frequency-and voltage-stabilizing circuit 30 discharges the stored energy of asynchronous machine, and its rotating speed is reduced in the default safety critical range of speeds.
Figure 17 is a frequency-and voltage-stabilizing circuit diagram of the present invention.The A phase of only drawing among the figure, B is mutually identical with A with C circuit mutually mutually, and branch N keeps off and regulating.As shown in figure 17, T
ABe bidirectional triode thyristor, G
1Be T
AThe control utmost point, C
AAnd R
ABe the electric capacity and the resistance of A phase, D
1D
NBe trigger tube, C
11, C
21C
1N, C
2NBe capacitor, R
1R
NBe resistor, W
1W
NBe potentiometer, N is the neutral line.U
aBe the A phase voltage of asynchronous machine, U
1U
NGrant trigger tube D after being respectively process phase shift of A phase voltage and dividing potential drop
1D
NMagnitude of voltage, U
D1U
DNBe trigger tube D
1D
NBreakdown voltage value, U
M1U
MNBe respectively U
1U
NAmplitude, α
1α
NBe respectively U
1U
NHysteresis U
aVoltage phase angle, circuit design has α
1＜...＜α
NRelation, so U
M1＞...＞U
MNSet up.Pseudo-load 29 in the empty frame corresponding diagram 8 among Fig. 9 is by resistance R
AAnd capacitor C
AForm.
When asynchronous machine 5 rotating speeds raise, voltage U
aIncrease U
M1U
MNAlso increase thereupon.Work as U
M1=U
D1The time, trigger tube D
1At (90-α
1) locate to send pulse, bidirectional triode thyristor T
AAt (90-α
1) conducting that is triggered, the resistance R of A phase
AThe upper reaches excess current consumes overcritical energy, as shown in figure 18.If rotating speed continues to raise voltage U
aFurther raise, thereby can make U
Mi=U
Di, trigger tube D
iAt (90-α
i) locate to send pulse, bidirectional triode thyristor T
AAt (90-α
i) conducting is triggered.If rotating speed continues to raise voltage U
aRaise, make U
MN=U
DN, trigger tube D
NAt (90-α
N) locate to send pulse, bidirectional triode thyristor T
AAt (90-α
N) conducting that is triggered, as shown in figure 19.That is to say, when the asynchronous machine rotating speed when the safety critical rotating speed begins to increase, bidirectional triode thyristor T
AOn trigger pulse can grow out of nothing, from (90-α
1) locate to be advanced to (90-α
N) locate, be subjected to bidirectional triode thyristor T
AThe load of control is grown out of nothing, is changed from small to large, makes above transition energy to be fallen by newly-increased pseudo-load consumption, plays the effect of frequency stabilization.
The outstanding problem that the shunt capacitance self-excitation asynchronous generator exists is that voltage change ratio is too high, and when rotating speed raise, motor terminal voltage increased, and being equivalent to load increases, and remains unchanged for making voltage, adopts the way that strengthens electric capacity very inconvenient.The present invention uses series capacitance C
AAdditional capacitive reactive power is provided, the voltage change ratio of asynchronous machine is improved, as open-circuit excitation capacitor 13 and series capacitance C
ACooperate when suitable, can make output voltage constant substantially, play the effect of voltage stabilizing.
Figure 20 is the structural representation of asynchronous machine self-excitation diagnostic mode of the present invention, as shown in figure 20, on technical scheme shown in Figure 16 basis, asynchronous machine 5 is connected with open-circuit excitation capacitor 13 by self-excitation switch 12, self-excitation switch 12 is subjected to driver element 20 controls, is responsible for open-circuit excitation capacitor 13 and asynchronous machine 5 are switched on or switched off.Open-circuit excitation capacitor 13 is preferably the excitation capacitor of triangle or star connection.The course of work of this diagnostic mode technical scheme is:
(B-I) with (A-I) of Figure 16 technical scheme;
(B-II) control module 211 control drive unit 20 closed self-excitation switches 12 insert open-circuit excitation capacitor 13; Control module 211 control drive unit 20 disconnect diagnosis switch 10, and cut-out asynchronous machine 5 is connected with AC power 1, and asynchronous machine 5 and open-circuit excitation capacitor 13 form the isolated island electricity generation systems;
(B-III) with (A-III) of Figure 16 technical scheme;
(B-IV) with (A-IV) of Figure 16 technical scheme;
(B-V) soft instrument unit 212 calculates the rotating speed of asynchronous machine 5 and the difference of this rotating speed and asynchronous machine synchronous rotational speed according to the voltage and current value, when described difference during less than preset difference value, control module 211 judges that asynchronous machine 5 begins to enter motoring condition, control drive unit 20 disconnects self-excitation switch 12, excision open-circuit excitation capacitor 13, closed diagnosis switch 10 inserts electrical network with asynchronous machine 5.
(B-VI) repeated execution of steps (B-I), the working cycle of formation asynchronous machine self-excitation diagnostic mode.
Figure 21 often encourages the structural representation of diagnostic mode for asynchronous machine of the present invention, on technical scheme shown in Figure 20 basis, asynchronous machine 5 is also by often encouraging switch 22 and often encouraging load 23 and be connected, often encourage load 23 also with one often to encourage electric capacity 19 in parallel, often encourage switch 22 and be subjected to driver element 20 control, responsiblely will often encourage load 23 and often encourage electric capacity 19 access asynchronous machines 5.Often encourage electric capacity 19 and be preferably the excitation capacitor of triangle or star connection.The course of work of this diagnostic mode technical scheme is:
(C-I) with (B-I) of Figure 20 technical scheme;
(C-II) control module 211 control drive unit 20 closed self-excitation switches 12 insert open-circuit excitation capacitor 13; Driver element 20 disconnects diagnosis switch 10, and cut-out asynchronous machine 5 is connected with AC power 1, and asynchronous machine 5 and open-circuit excitation capacitor 13 form the isolated island electricity generation systems; After treating that voltage is set up, driver element 20 closures are often encouraged switch 22, insert and often encourage load 23 and often encourage electric capacity 19;
(C-III) with (B-III) of Figure 20 technical scheme;
(C-IV) with (B-IV) of Figure 20 technical scheme;
(C-V) with (B-V) of Figure 20 technical scheme;
(C-VI) repeated execution of steps (C-I) forms the working cycle that asynchronous machine is often encouraged diagnostic mode.
Figure 22 loses the structural representation of encouraging diagnostic mode for asynchronous machine of the present invention, and on technical scheme shown in Figure 20 basis, asynchronous machine 5 is encouraged switch 15 by mistake and encouraged load 16 with mistake and is connected, loses to encourage switch 15 and be subjected to driver element 20 controls, responsible load 16 accesses is encouraged in mistake.Mistake is encouraged load 16 and is actually a heavy load, is connected on whenever to go up mutually, encourages load 16 when inserting when mistake, and asynchronous machine 5 self-excitation conditions are destroyed, and its voltage and current reduces gradually, up to being zero.The course of work of this diagnostic mode technical scheme is:
(D-I) with (B-I) of Figure 20 technical scheme;
(D-II) control module 211 control drive unit 20 closed self-excitation switches 12 insert open-circuit excitation capacitor 13; Control module 211 control drive unit 20 disconnect diagnosis switch 10, and cut-out asynchronous machine 5 is connected with AC power 1, and asynchronous machine 5 and open-circuit excitation capacitor 13 form the isolated island electricity generation systems; After treating that voltage is set up, driver element 20 closed mistakes are encouraged switch 15, load 16 is encouraged in mistake insert;
(D-III) with (B-III) of Figure 20 technical scheme;
(D-IV) with (B-IV) of Figure 20 technical scheme;
(D-V) with (A-V) of Figure 16 technical scheme;
(D-VI) repeated execution of steps (D-I) forms asynchronous machine and loses the working cycle of encouraging diagnostic mode.
In technique scheme of the present invention, diagnosis switch 10 adopts the electronic pressure regulating switch, preferred version adopts controllable silicon, the excision when being responsible for current over-zero and the non-transient input of quick voltage zero passage and progressively boost to the overload rush of current of ratings when preventing to drop into.
Figure 23 is an asynchronous motor of walking-beam pumping unit trouble-shooter fundamental diagram of the present invention, and thick line is represented the forceful electric power circuit among the figure, and fine rule is represented the light current circuit.Figure 24 is an asynchronous motor of walking-beam pumping unit trouble-shooter circuit diagram of the present invention, and wherein an emphasis has been illustrated strong power part among Figure 24.Further describe technical scheme of the present invention below by installation of the present invention, debugging and operational process.
A, system install:
B, put into operation:
1, state before the energising: switch 6 disconnects, and switch 7 disconnects, switch 3, ac power switch 1 and former control system switch 4 closures, and the former control system of oil pumper is work as usual, and the present invention prepares to put into operation.
2, the present invention's energising: manual closing switch 6, the closed DC power supply switch 24 in the normal back of power-supply system, direct supply and holding circuit 25 put into operation, and computer control 21 is started working, and enters the self check state.
3, the present invention has the test of carrying: after computer control 21 self checks are errorless, be set at the test run mode of carrying.Computer control 21 carries out following operation automatically: auto-closing is often encouraged switch 22, often encourage load 23 and often encourage electric capacity 19 and put into operation, the present invention enters the load testing state, content measurement mainly comprises diagnosis switch 10, generating effect switch 26, self-excitation switch 12, loses the correctness of encouraging switch 15, pseudo-load switch 18 and often encouraging switch 22 controls, the correctness that current transformer 11, voltage transformer (VT) 14 are measured.After testing successfully, make diagnosis switch 10 be in open position, change next step over to.There is fault then out of service.4, the present invention puts into operation: computer control 21 disconnects self-excitation switches 12, loses and encourage switch 15 and often encourage switch 22, open-circuit excitation capacitor 13, loses and encourages load 16, often encourages electric capacity 19 and often to encourage load 23 out of service; Computer control 21 closed pseudo-load switches 18 put pseudo-load 29 and frequency-and voltage-stabilizing circuit 30 into operation, and the controllable silicon of frequency-and voltage-stabilizing circuit 30 is an off state at this moment; Computer control 21 is Closing Switch 7 at first, and closed then diagnosis switch 10 disconnects switch 3, and current transformer 8 has current flowing, the present invention put into operation and with the former control system co-ordination of oil pumper; Put into operation the failure after, cut-off switch 6 and switch 7, Closing Switch 3, the present invention is out of service.
C, learning phase:
After the present invention put into operation, data acquisition unit 17 was gathered the transient data of asynchronous machine 5 working voltages and electric current in real time; Computer control 21 according to the dust cycle data of institute's collection asynchronous machine after automatically study of beginning, step is as follows:
1, determine key parameter value in dust cycle of asynchronous machine: asynchronous machine is in time and the starting point that time of motoring condition and starting point, asynchronous machine are in generating state;
2, judge that can time that asynchronous machine is in generating state satisfy the requirement of fault diagnosis, when asynchronous machine is in generating state time domain data window and can not fully carries out fault diagnosis, computer control 21 drops into suitable generating effect capacitors 28 by generating effect switch 26 summation current transformers 27, artificial adjustment asynchronous machine is in the time of generating state, until satisfy till the requirement of fault diagnosis data window; Closed generating effect switch 26, generating effect capacitors 28 incoming transport power supplys in parallel 2 loops that debugging is good; Remain unchanged during the fault diagnosis of capability value before carrying out learning phase next time of generating effect capacitors 28; Detect the asynchronous machine situation in real time, prepare to enter the asynchronous machine generating state stage.
D, asynchronous machine generating state stage:
When asynchronous machine 5 entered generating state, job step of the present invention was:
1, excision asynchronous machine 5: computer control 21 disconnects diagnosis switch 10 by driver element 20, and computer control 21 detects current transformer 11 no currents by data acquisition unit 17 and exists, illustrate to disconnect successfully, otherwise explanation diagnosis switch 10 faults;
2, data acquisition and fault diagnosis: in the time of excision asynchronous machine 5, by self-excitation switch 12, lose the operative combination encourage switch 15 and often to encourage switch 22, realize the diagnosis circulation of four kinds of fault diagnosis models, study the frequency spectrum of asynchronous machine terminal voltage and stator winding electric current (line current) in each process, be respectively:
(1) asynchronous machine dead electricity diagnostic mode
Do not carry out any switching manipulation, directly image data is diagnosed;
(2) asynchronous machine self-excitation diagnostic mode
Closed self-excitation switch 12 drops into open-circuit excitation capacitor 13, and image data is diagnosed;
(3) asynchronous machine is often encouraged diagnostic mode
Closed self-excitation switch 12 drops into open-circuit excitation capacitor 13, and after setting up voltage, closure is often encouraged switch 22, drops in parallel often encouraging load 23 and often encourage electric capacity 19, and image data is diagnosed;
(4) asynchronous machine loses and encourages diagnostic mode
Closure self-excitation switch 12 drops into open-circuit excitation capacitor 13, and after setting up voltage, the closed mistake encouraged switch 15, loses in every access mutually and encourages load 16, and image data is diagnosed; This moment, the self-excitation condition was destroyed, and the asynchronous machine voltage and current reduces gradually, up to being zero.
In the working cycle of above-mentioned four kinds of fault diagnosis models, frequency-and voltage-stabilizing circuit 30 is the no-load voltage of monitoring asynchronous machine automatically, no-load voltage as asynchronous machine is too high, the controllable silicon conducting of frequency-and voltage-stabilizing circuit 30, pseudo-load 29 consumes overcritical energy, when the no-load voltage of asynchronous machine was reduced in the default safety critical voltage range, the controllable silicon of frequency-and voltage-stabilizing circuit 30 turn-offed;
3, judge that asynchronous machine enters motoring condition: asynchronous machine is in the time of generating state, and the present invention has adopted two kinds of judgment modes respectively: rotating speed judgment mode and automatic time delay mode.Be specially:
(1) asynchronous machine self-excitation diagnostic mode and often encourage diagnostic mode
After asynchronous machine 5 withdraws from from electrical network, asynchronous machine 5 enters unloaded generating state, and its part potential energy is become the kinetic energy of rotation, open-circuit excitation capacitor 13 provides open-circuit excitation, by oil pumper mechanical system 9, asynchronous machine 5, system switching 4, switch 7 and open-circuit excitation capacitor 13 form the isolated island electricity generation system, simultaneously by current transformer 8, voltage transformer (VT) 14, data acquisition unit 17 and computer control 21 composition data acquisition systems, gather the voltage and current instantaneous value of asynchronous machine 5, the parameter that satisfies power on condition at line computation asynchronous machine 5 according to the cycle or the frequency of voltage and current: asynchronous machine 5 rotating speeds near synchronous rotational speed constantly, that is: asynchronous machine 5 is in the time and the starting point of motoring condition;
(2) diagnostic mode is encouraged in asynchronous machine dead electricity diagnostic mode and mistake
When asynchronous machine 5 enters motoring condition, the present invention will change the operation of asynchronous machine motoring condition stage over to, and the present invention was out of service when fault was arranged.
E, asynchronous machine motoring condition stage:
When asynchronous machine 5 entered motoring condition, job step of the present invention was:
1, drop into asynchronous machine: computer control 21 is by driver element 20 closed diagnosis switches 10, diagnosis switch 10 progressively increases voltage up to ratings by changing trigger angle, the current signal of current transformer 11 feeds back to computer control 21 through data acquisition unit 17, explanation is closed a floodgate successfully when having detected electric current and existing, otherwise illustrates and diagnose switch 10 faults;
2, asynchronous machine 5 enters the electric operation stage, data acquisition unit 17 is gathered the voltage and current instantaneous value of asynchronous machine 5 in real time, computer control 21 is sought its zero crossing as the asynchronous machine outage condition in the active power value of line computation, and promptly asynchronous machine 5 is in the time and the starting point of generating state.When computer control 21 judges that asynchronous machine 5 enters generating state, the present invention will change the operation of asynchronous machine generating state stage over to, and the present invention was out of service when fault was arranged.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1. asynchronous motor of walking-beam pumping unit method for diagnosing faults wherein, comprises step:
Step 10, under asynchronous machine energising running status, the voltage and current instantaneous value when data acquisition unit is gathered the asynchronous machine operation in real time, and give computer control with the voltage and current data transmission;
When step 20, computer control judged that according to described voltage and current data asynchronous machine enters generating state, the output control signal was given driver element;
Step 30, computer control enter predefined fault diagnosis model by driver element control asynchronous machine, driver element control diagnosis switch disconnection asynchronous machine is connected with AC power, computer control carries out synthetic fault diagnosis according to the asynchronous machine voltage and current data that data acquisition unit is gathered in real time, and the output control signal is given driver element when asynchronous machine enters motoring condition;
Step 40, computer control withdraw from fault diagnosis model by driver element control asynchronous machine, and driver element control diagnosis switch recovery asynchronous machine is connected with AC power.
2. asynchronous motor of walking-beam pumping unit method for diagnosing faults as claimed in claim 1, wherein, described step 30 is specially:
Step 311, asynchronous machine enter asynchronous machine dead electricity diagnostic mode;
Step 312, driver element control diagnosis switch disconnection asynchronous machine are connected with AC power;
Step 313, data acquisition unit are gathered the voltage and current instantaneous value of asynchronous machine in this dead electricity process in real time and are transferred to computer control, and computer control carries out fault diagnosis according to the frequency spectrum of described voltage and current data;
Step 314, computer control automatic time delay, time-delay finish back output control signal to driver element.
3. asynchronous motor of walking-beam pumping unit method for diagnosing faults as claimed in claim 1, wherein, described step 30 is specially:
Step 321, asynchronous machine enter asynchronous machine self-excitation diagnostic mode;
The closed self-excitation of step 322, driver element switch is set up being connected of open-circuit excitation capacitor and asynchronous machine, and what driver element control diagnosis switch disconnected asynchronous machine and AC power is connected asynchronous machine and open-circuit excitation capacitor formation isolated island electricity generation system;
Step 323, data acquisition unit are gathered the voltage and current instantaneous value of asynchronous machine in this self in real time and are transferred to computer control, and computer control carries out fault diagnosis according to the frequency spectrum of described voltage and current data;
When step 324, computer control judged that according to described voltage and current data asynchronous machine enters motoring condition, the output control signal was given driver element.
4. asynchronous motor of walking-beam pumping unit method for diagnosing faults as claimed in claim 1, wherein, described step 30 is specially:
Step 331, asynchronous machine enter asynchronous machine and often encourage diagnostic mode;
Step 332, the closed self-excitation of driver element switch, set up being connected of open-circuit excitation capacitor and asynchronous machine, driver element control diagnosis switch disconnection asynchronous machine is connected with AC power, asynchronous machine and open-circuit excitation capacitor form the isolated island electricity generation system, the driver element closure is often encouraged switch, sets up and often to encourage being connected of load and asynchronous machine;
Step 333, data acquisition unit are gathered this in real time and are often encouraged the voltage and current instantaneous value of asynchronous machine in the process and be transferred to computer control, and computer control carries out fault diagnosis according to the frequency spectrum of described voltage and current data;
When step 334, computer control judged that according to described voltage and current data asynchronous machine enters motoring condition, the output control signal was given driver element.
5. asynchronous motor of walking-beam pumping unit method for diagnosing faults as claimed in claim 1, wherein, described step 30 is specially:
Step 341, asynchronous machine enter the asynchronous machine mistake and encourage diagnostic mode;
Step 342, the closed self-excitation of driver element switch, set up being connected of open-circuit excitation capacitor and asynchronous machine, driver element control diagnosis switch disconnection asynchronous machine is connected with AC power, asynchronous machine and open-circuit excitation capacitor form the isolated island electricity generation system, the closed mistake of driver element encouraged switch, sets up to lose and encourages being connected of load and asynchronous machine;
Step 343, data acquisition unit are gathered this mistake in real time and are encouraged the voltage and current instantaneous value of asynchronous machine in the process and be transferred to computer control, and computer control carries out fault diagnosis according to the frequency spectrum of described voltage and current data;
Step 344, computer control automatic time delay, time-delay finish back output control signal to driver element.
6. as the arbitrary described asynchronous motor of walking-beam pumping unit method for diagnosing faults of claim 1～5, wherein, also comprise parameter value setting step, be specially:
Step 100, data acquisition unit are gathered the transient data of asynchronous machine working voltage and electric current in real time, and give computer control with data delivery;
Step 110, computer control be according to the dust cycle data, determines the parameter value in dust cycle of asynchronous machine: asynchronous machine is in time and the starting point that time of motoring condition and starting point, asynchronous machine are in generating state;
Step 120, computer control judge whether the time of asynchronous machine generating state satisfy the fault diagnosis requirement, are execution in step 140 then, otherwise execution in step 130;
The capacity of the generating effect capacitors that step 130, adjustment are in parallel with AC power, execution in step 100;
Step 140, preservation parameter value, setting finishes.
7. asynchronous motor of walking-beam pumping unit trouble-shooter, it is characterized in that, comprise the diagnosis switch that is connected on asynchronous machine and the ac power supply circuit, described diagnosis switch is connected with its driver element that is switched on or switched off of control, described driver element and one sends the computer control that is switched on or switched off control signal and is connected, and the data acquisition unit that described computer control and is gathered asynchronous machine voltage and current data is connected; Described computer control comprises soft instrument unit and the failure diagnosis unit that is connected with control module respectively, described soft instrument unit is connected with described data acquisition unit, be used for active power value and/or rotating speed according to the voltage and current data computation asynchronous machine that receives, described failure diagnosis unit is connected with described data acquisition unit, be used for carrying out fault diagnosis according to the frequency spectrum of the voltage and current data that receive, described control module is connected with described driver element, and the control asynchronous machine enters predefined fault diagnosis model and enters generating, motoring condition.
8. asynchronous motor of walking-beam pumping unit trouble-shooter as claimed in claim 7, it is characterized in that, a described AC power generating effect capacitors also in parallel, described asynchronous machine also connects the pseudo-load and the frequency-and voltage-stabilizing circuit of a serial connection, described asynchronous machine also connects the self-excitation switch and the open-circuit excitation capacitor of a serial connection, and described self-excitation switch is connected with described driver element.
9. asynchronous motor of walking-beam pumping unit trouble-shooter as claimed in claim 8, it is characterized in that, described asynchronous machine also connects often encouraging switch and often encouraging load of a serial connection, and the described switch of often encouraging is connected with described driver element, described often encourage load also parallel connection one often encourage electric capacity.
10. asynchronous motor of walking-beam pumping unit trouble-shooter as claimed in claim 8 is characterized in that, described asynchronous machine also connects the mistake of a serial connection and encourages switch and load is encouraged in mistake, and described mistake is encouraged switch and is connected with described driver element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100083090A CN100410677C (en) | 2006-02-17 | 2006-02-17 | Method and apparatus for asynchronous motor fault diagnosis for beam-pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100083090A CN100410677C (en) | 2006-02-17 | 2006-02-17 | Method and apparatus for asynchronous motor fault diagnosis for beam-pumping unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1808161A true CN1808161A (en) | 2006-07-26 |
| CN100410677C CN100410677C (en) | 2008-08-13 |
Family
ID=36840165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100083090A Expired - Fee Related CN100410677C (en) | 2006-02-17 | 2006-02-17 | Method and apparatus for asynchronous motor fault diagnosis for beam-pumping unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100410677C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945349B (en) * | 2006-10-30 | 2010-10-06 | 天津理工大学 | Flexible generating device for embedded AC motor complex fault |
| CN102170263A (en) * | 2010-02-26 | 2011-08-31 | 山东成华电子科技有限公司 | Pumping unit motor energy-saving control method and system |
| CN103670373A (en) * | 2012-09-26 | 2014-03-26 | 中国石油天然气股份有限公司 | Method and system for diagnosing faults of pumping unit |
| CN105572503A (en) * | 2015-12-21 | 2016-05-11 | 东营东齐石油科技有限公司 | Oil pumping unit electrical parameter data pre-processing method based on multiple scale sampling |
| CN107842489A (en) * | 2016-09-19 | 2018-03-27 | 中国石油化工股份有限公司 | A kind of motor speed method of adjustment of beam pumping unit |
| CN108798639A (en) * | 2017-05-04 | 2018-11-13 | 中国石油化工股份有限公司 | Pumping unit travelling valve opening point recognition methods and system |
| CN112098836A (en) * | 2020-08-14 | 2020-12-18 | 贵州乌江水电开发有限责任公司东风发电厂 | Motor unstable data elimination method and system based on electrical distortion analysis |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3188806B2 (en) * | 1994-04-04 | 2001-07-16 | 三菱電機株式会社 | DC motor rotation failure detection device and DC motor drive device |
| CN1111285C (en) * | 1997-11-12 | 2003-06-11 | 冶金工业部自动化研究院 | Expert diagnostic method for fault of dc. motor |
| DE10041607B4 (en) * | 2000-08-24 | 2006-04-13 | Berger Lahr Gmbh & Co. Kg | Electric working device and method for its operation |
| US6822839B2 (en) * | 2002-12-05 | 2004-11-23 | Eaton Corporation | Method and apparatus of detecting internal motor faults in an induction machine |
| CN1321328C (en) * | 2003-04-28 | 2007-06-13 | 广东省电力工业局试验研究所 | Wavelet diagnostic system for initial failure of electromotor and method for diagnosing malfunction of electromotor |
| DE10337846A1 (en) * | 2003-08-18 | 2005-03-17 | Robert Bosch Gmbh | Motor vehicle generator testing process in which the current through a stationary generator is measured both with and without an applied excitation current, with the measurements being compared to determine generator efficiency |
-
2006
- 2006-02-17 CN CNB2006100083090A patent/CN100410677C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945349B (en) * | 2006-10-30 | 2010-10-06 | 天津理工大学 | Flexible generating device for embedded AC motor complex fault |
| CN102170263A (en) * | 2010-02-26 | 2011-08-31 | 山东成华电子科技有限公司 | Pumping unit motor energy-saving control method and system |
| CN102170263B (en) * | 2010-02-26 | 2013-03-13 | 山东成华电子科技有限公司 | Pumping unit motor energy-saving control method and system |
| CN103670373A (en) * | 2012-09-26 | 2014-03-26 | 中国石油天然气股份有限公司 | Method and system for diagnosing faults of pumping unit |
| CN103670373B (en) * | 2012-09-26 | 2016-03-09 | 中国石油天然气股份有限公司 | The diagnostic method of oil pumping machine fault and system |
| CN105572503A (en) * | 2015-12-21 | 2016-05-11 | 东营东齐石油科技有限公司 | Oil pumping unit electrical parameter data pre-processing method based on multiple scale sampling |
| CN107842489A (en) * | 2016-09-19 | 2018-03-27 | 中国石油化工股份有限公司 | A kind of motor speed method of adjustment of beam pumping unit |
| CN108798639A (en) * | 2017-05-04 | 2018-11-13 | 中国石油化工股份有限公司 | Pumping unit travelling valve opening point recognition methods and system |
| CN108798639B (en) * | 2017-05-04 | 2022-04-12 | 中国石油化工股份有限公司 | Method and system for identifying moving valve opening point of oil pumping unit |
| CN112098836A (en) * | 2020-08-14 | 2020-12-18 | 贵州乌江水电开发有限责任公司东风发电厂 | Motor unstable data elimination method and system based on electrical distortion analysis |
| CN112098836B (en) * | 2020-08-14 | 2021-05-14 | 贵州乌江水电开发有限责任公司东风发电厂 | Motor unstable data elimination method and system based on electrical distortion analysis |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100410677C (en) | 2008-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1808161A (en) | Method and apparatus for asynchronous motor fault diagnosis for beam-pumping unit | |
| CN1040384C (en) | Controlling device and abnormal detecting method of commutatorless electric motor and air conditioner | |
| CN1293701C (en) | Step failing out detecting apparatus and method for synchronous motor, driving apparatus for motor | |
| CN101061630A (en) | Power supply apparatus with function of detecting abnormality of current sensor | |
| CN1180275C (en) | Method for measuring motor constant of induction motor | |
| CN1278483C (en) | Motor control device | |
| CN1082111C (en) | Washing machine | |
| CN1203608C (en) | Brushless motor protector | |
| CN103166566B (en) | Three-phase motor driving control device | |
| CN1260763C (en) | Semiconductor relay and method for controlling same | |
| CN1419728A (en) | AC power generating system | |
| CN1426510A (en) | Method of operating turbine | |
| CN1719680A (en) | Can detect the unusual supply unit of the electric current that flows through drive circuit | |
| CN1808887A (en) | Energy-saving control method and apparatus for asynchronous motor of walking-beam pumping unit | |
| CN102969970B (en) | Motor efficiency tracking driving system and driving method | |
| CN1866716A (en) | Electrical power source, operational method of the same, inverter and operational method of the same | |
| CN2881664Y (en) | Fault diagnosis device for asynchronous dynamo of beam pump | |
| CN1107758C (en) | Electrical washing machine | |
| CN101734529A (en) | Elevator starting torque compensation method | |
| CN1465984A (en) | Unusual detector for vehicle carried electric loading driving system | |
| CN1696723A (en) | Electric arc fault detector | |
| CN103344915A (en) | Synchronous motor temperature rise test system and method | |
| CN107888063B (en) | A kind of output current peak coefficient method and device improving inverter | |
| CN103441710B (en) | A kind of asphalt blending station vibratory sieve dynamic braking device and braking method | |
| CN1217474C (en) | Washer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TANGSHAN SANJIN MINGSHENG INDUSTRIAL DEVELOPMENT C Free format text: FORMER OWNER: CHINA PETROLEUM COLLEGE Effective date: 20090522 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090522 Address after: No. 26, Kaiping Industrial Park, Hebei, Tangshan City Patentee after: Tangshan Sanjin Mingsheng Industrial Development Co., Ltd. Address before: Beijing city Changping District Road No. 20 Patentee before: China University of Petroleum (Beijing) |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080813 Termination date: 20180217 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |