CN109683089A - Motor bus high resistance connecting fault detection device and method based on WSN - Google Patents
Motor bus high resistance connecting fault detection device and method based on WSN Download PDFInfo
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- CN109683089A CN109683089A CN201811451260.5A CN201811451260A CN109683089A CN 109683089 A CN109683089 A CN 109683089A CN 201811451260 A CN201811451260 A CN 201811451260A CN 109683089 A CN109683089 A CN 109683089A
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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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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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
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
- G01R31/69—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
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Abstract
本发明公开电机故障诊断领域中一种基于WSN的电机母线高电阻连接故障检测装置与方法，WSN数据采集装置通过数据传送线与上位机相连接；五相电机的一相母线进出线与1个母线接头测温部件连接，五相接头温度采集装置通过无线收发模块与WSN数据采集装置相互传送数据；实验装置由相互串接的电流源开关、恒流电流源和相互串接的微欧仪开关、微欧仪并联后串接在母线进线和母线出线之间组成；通过对电机母线接头温度和相电流进行监测，对电机母线高电阻连接故障进行诊断，微欧仪确定接头阻抗，接头阻抗检测精度达到了微欧级别，采用红外测温传感器测温，提高母线接头阻抗检测精度，采用WSN信息传输技术使装置与电机之间实现信息无线传输。
The invention discloses a WSN-based motor bus high resistance connection fault detection device and method in the field of motor fault diagnosis. The WSN data acquisition device is connected with a host computer through a data transmission line; The busbar joint temperature measuring components are connected, and the five-phase joint temperature acquisition device transmits data to each other through the wireless transceiver module and the WSN data acquisition device; The micro-ohmmeter is connected in series between the incoming busbar and the outgoing busbar; by monitoring the temperature and phase current of the motor busbar joint, the high resistance connection fault of the motor busbar is diagnosed, and the microohmmeter determines the joint impedance and the joint impedance. The detection accuracy has reached the micro-ohm level. The infrared temperature sensor is used to measure the temperature to improve the detection accuracy of the bus joint impedance. The WSN information transmission technology is used to realize the wireless transmission of information between the device and the motor.
Description
Technical field
The present invention relates to Diagnosing Faults of Electrical technical fields, specifically to the high resistance connecting fault of alternating current generator bus into
Row monitoring, diagnoses motor bus high resistance connecting fault according to monitoring result.
Background technique
The high resistance connection (HRC) of alternating current generator bus is one of most common failure in alternating current generator.Motor bus connects
It is connected by screw bolts at head, is not tightened once there is track bolt, or expand with heat and contract with cold and oxidative phenomena, can all make motor mother
Wire terminal impedance increases.High resistance connection in motor circuit will lead to hot-spot and supply voltage is uneven, to make to match
Electric system and the efficiency of motor reduce, or even also will cause unexpected process and shut down.Therefore, the high resistant connection of motor bus is monitored
Problem is most important for reliable, the efficient and safe operation of industrial equipment.Currently, about motor busbar joint temperature and contact
Research in terms of impedance is more, but the method for on-line checking busbar joint impedance is seldom.Especially for five phase fault-tolerant motors, electricity
The detection of machine busbar joint high resistance connection is critically important, can find failure in time and take corresponding effectively fault-tolerant measure.
Currently, main to the high resistance connectivity problem of motor bus analyzed from current of electric characteristic aspect, one
As there are two types of detection method, a kind of method is that high electricity is detected using the third-harmonic component of stator current based on stator current
Resistance connection (HRC)；Another kind is based on zero sequence voltage component (ZSVC) detection method, is examined by monitoring the fundametal component of ZSVC
Survey high resistance connection.But the detection limit of these detection methods can only achieve ohm level, be not to be able to satisfy actually to answer in many occasions
With needs.Chinese Patent Application No. is 201810335660.3, a kind of entitled " busbar joint micro-ohm grade impedance on-line checking
The detection method mentioned in the document of method and apparatus " is to obtain busbar joint micro-ohm grade using resonance signal method for implanting to hinder
It is anti-, but this is a kind of full contact formula method, and there are forceful electric power and light current isolating problem.
Summary of the invention
Object of the present invention is in view of the deficiencies of the prior art mentioned above, provide a kind of motor bus high resistant based on WSN
Connecting fault detection device and its detection method realize micro-ohm grade to motor busbar joint impedance by Non-contact Infrared Temperature Measurement
On-line Fault Detection.
The present invention is based on the motor bus high resistance connecting fault detection device of WSN the technical solution adopted is that: five phases electricity
1 current sensor is respectively housed, 5 current sensors pass through data transmission line and 1 five phase in every phase bus outlet of machine
Current collecting device connection, five phase current acquisition devices transmit data by radio receiving transmitting module and WSN data acquisition device,
WSN data acquisition device is connected by data transmission line with host computer；A phase bus inlet-outlet line and 1 bus for five-phase induction motor
The connection of connector temperature-measuring part, 5 busbar joint temperature-measuring parts pass through data transmission line and 1 five phase connector temperature collecting device phase
Even, five phase connector temperature collecting devices mutually transmit data by radio receiving transmitting module and WSN data acquisition device；Five-phase induction motor
A wherein phase bus inlet wire and bus outlet between concatenate experimental provision, experimental provision is opened by the current source mutually concatenated
It closes, be serially connected between bus inlet wire and bus outlet after continuous current source and the microhmmeter switch mutually concatenated, microhmmeter parallel connection
Composition.
The technical solution that the detection method of the motor bus high resistance connecting fault detection device based on WSN uses
It is to include the following steps:
A: the BP neural network between motor busbar joint impedance R and each phase current I, temperature T is obtained using experimental provision
Model R=f (I, T) is simultaneously stored in host computer；
B, motor is acquired corresponding busbar joint temperature T by busbar joint temperature-measuring part and is passed through in actual moving process
Five phase connector temperature collecting devices, WSN data acquisition device are sent to host computer；It is corresponding by the acquisition of five phase current acquisition devices
Phase current I simultaneously gives host computer, host computer temperature T and phase current I through WSN data acquisition device again, by BP neural network model R
=f (I, T) calculates busbar joint impedance R；
C, each phase busbar joint impedance R is compared with preset high resistant threshold value VAL, if R > VAL, busbar joint
For high resistant connecting fault, otherwise fault-free.
Further, in step A, using experimental provision obtain motor busbar joint impedance R and each phase current I, temperature T it
Between BP neural network model R=f (I, T) the step of be:
Step 1: disconnecting inverter switching device and microhmmeter switch, closed path source switch, adjusting continuous current source keeps its defeated
Electric current is I out0, the electric current on bus inlet-outlet line is acquired by five phase current acquisition devices and is sent to host computer；
Step 2: turn-off current source switch, closure microhmmeter switch, adjust the impedance at busbar joint, microhmmeter measures
Busbar joint impedance magnitude R00And input host computer；
Step 3: disconnecting microhmmeter switch, closed path source switch measures busbar joint by busbar joint temperature-measuring part
Impedance R00Under temperature T00, five phase connector temperature collecting devices acquisition, send host computer through WSN data acquisition device；
Step 4: repeating second step to third step n times, host computer 11 obtains machine busbar joint impedance R0iAnd corresponding temperature
T0i, i=0,1 ... ..., n；
Step 5: repeating the first step to the 4th step repeats n times, host computer obtains electric current IiAnd corresponding busbar joint resistance
Anti- RkiWith temperature Tki, i=0,1 ... ..., n, k=0,1 ... ..., n；By electric current IiWith temperature TkiAs BP neural network model
Input variable, impedance RkiBP neural network model R=f (I, T) is constructed as output variable.
The remarkable result that the present invention has afterwards by adopting the above technical scheme is:
1. existing detection system obtains motor bus high resistance with residual voltage phase relation by electric machine phase current and connect
Fault eigenvalue, detection accuracy are an ohm ranks.The present invention is by being monitored motor busbar joint temperature and phase current, root
Motor bus high resistance connecting fault is diagnosed according to monitoring result.It is closed by the temperature change of electric machine phase current and joint
System obtains motor bus high resistance connecting fault characteristic value, due to that can generate I in motor busbar joint impedance2(I is electricity to Rt
Stream, R is impedance, and t is the time) Joule heat, temperature can be generated in motor busbar joint top nut, the present invention uses microhmmeter
Determine impedance, the model established is micro-ohm grade, and the detection accuracy of impedance has reached micro-ohm rank, reduces event
Hinder detection limit.
2. the present invention uses infrared temperature probe thermometric, the sensor for temperature changing sensitivity is high, and is non-contact
Formula temperature-sensitive.When impedance has the variation of micro-ohm grade, infrared temperature probe just has a greater change, therefore it is suitable to respond effect
It is sensitive.High sensitivity improves motor busbar joint impedance detection precision, and contactless temperature-sensitive has not only acted as good isolation
Effect, and improve the stability of thermometric.
3. the present invention uses the WSN information transmission technology, make to realize information wireless transmission between fault detection means and motor,
Structure is simple, is convenient for practical application.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams of the motor bus high resistance connecting fault detection device of WSN；
Fig. 2 is the schematic enlarged-scale view of motor busbar joint temperature-measuring part 5 in Fig. 1；
Relation model figure of the Fig. 3 between temperature, electric current and impedance three；
The serial number and title of each component in attached drawing: 1. inverters；2. bus inlet wire；3. terminal box；4. five phase connector temperatures
Acquisition device；5. busbar joint temperature-measuring part；6. bus outlet；7. current sensor；8. five phase current acquisition devices；9. five phases
Motor；10.WSN data acquisition device；11. host computer；12. bolt；13. top nut；14. Upper gasket；15. lower gasket；Under 16.
Nut；17. hold-down support；18. terminal box base；19. infrared temperature probe；20. fixed pillar；21. temperature collection circuit
Plate；22. continuous current source；23. current supply switch；24. microhmmeter switchs；25. microhmmeter；26. inverter switching device.
Specific embodiment
Referring to Fig. 1, it is identical with 5 that the present invention is based on the motor bus high resistance connecting fault detection devices of WSN
5,1 busbar joint temperature-measuring part 5 of busbar joint temperature-measuring part connect a phase bus inlet-outlet line of five-phase induction motor 9.5 buses
Connector temperature-measuring part 5 is connected by data transmission line with 1 five phase connector temperature collecting device 4.1 five phase connector temperature acquisition
Device 4 and 5 busbar joint temperature-measuring part 5 is installed in inside terminal box 3.
Five phase connector temperature collecting devices 4 pass through radio receiving transmitting module and the mutually transmission data of WSN data acquisition device 10.
Five phase connector temperature collecting devices 4 and WSN data acquisition device 10 are respectively by the groups such as radio receiving transmitting module and ARM processing module
At.
A current sensor 7 is installed in every phase bus outlet 6 of five-phase induction motor 9, bus outlet 6 is separately connected one
A current sensor 7 is followed by five-phase induction motor 9, is shared 5 current sensors, 7,5 current sensors 7 and is passed by data
Line sending is connect with 1 five phase current acquisition device 8.Five phase current acquisition devices 8 are mounted on outside connection box for motor 3, are by nothing
The composition such as line transceiver module, signal processing circuit, data communication interface circuit, passes through data transmission line and each phase current sensor
7 are connected, and transmit data by radio receiving transmitting module and WSN data acquisition device 10.WSN data acquisition device 10 is passed by data
Line sending is connected with host computer 11.
The bus inlet wire 2 of a wherein phase for five-phase induction motor 9 is connected on inverter 1 by inverter switching device 26, and inverter is opened
26 are closed to be serially connected between bus inlet wire 2 and inverter 1.
Experimental provision is concatenated between the bus inlet wire 2 and bus outlet 6 of a wherein phase for five-phase induction motor 9, effect is
Experimental modeling is carried out to motor busbar joint electric current, temperature and the relational model of impedance.Due to motor busbar joint physical structure
Completely the same, motor busbar joint electric current, temperature and the relational model of impedance are the same, therefore only need to be to one of bus
Connector carries out Experimental modeling, and experimental provision need to only connect a wherein phase bus.The experimental provision is by current supply switch 23, Constant Electric Current
Stream source 22, microhmmeter switch 24, microhmmeter 25 form.Current supply switch 23, continuous current source 22 and the mutual string mutually concatenated
It is serially connected between bus inlet wire 2 and bus outlet 6 after the microhmmeter switch 24 that connects, 25 parallel connection of microhmmeter.23 He of current supply switch
Microhmmeter switch 24 is connected with bus inlet wire 2, and continuous current source 22 and microhmmeter 25 are connected with bus outlet 6.
Referring to fig. 2, busbar joint temperature-measuring part 5 include an infrared temperature probe 19, infrared temperature probe 19 with
Signal processing circuit, data communication interface circuit are installed along on temperature collection circuit plate 21, and temperature collection circuit plate 21 is logical
Fixed pillar 20 is crossed to be fixedly connected on the hold-down support 17 of L-type.Bus inlet-outlet line is wound on bolt 12, bus inlet-outlet line it is upper
Side is matched by Upper gasket 14 and top nut 13 with bolt 12, for tightening and fixing bus inlet-outlet line, bus inlet-outlet line
Lower section is matched by lower gasket 15 and lower nut 16 with bolt 12, for tightening and fixing bus inlet-outlet line.Under bolt 12
It holds while being fixedly connected with hold-down support 17 and terminal box base 18, hold-down support 17 is mounted on terminal box base 18, terminal box
Pedestal 18 is fixed together with terminal box 3.Infrared temperature probe 19 faces the position of top nut 13, does not connect with top nut 13
Touching, distance away, is shown in d millimeters of distance in Fig. 2.
Ginseng as shown in FIGS. 1 and 2, the present invention is based on the motor bus high resistance connecting fault detection device of WSN work when, first
The relational model R between the temperature T and each phase current I at the impedance of motor busbar joint and top nut 13 is obtained using experimental provision
=f (I, T), and be stored in host computer 11.Specific method is:
Step 1: disconnecting inverter switching device 26 and microhmmeter switch 24, closed path source switch 23 adjusts continuous current source
22 make it export electric current I0, the electric current on bus inlet-outlet line is acquired by five phase current acquisition devices 8 and is sent to host computer
11, it is saved by host computer 11.
Step 2: turn-off current source switch 23, is closed microhmmeter switch 24, adjusting nut is to change at motor busbar joint
Impedance, motor busbar joint impedance magnitude R is measured by microhmmeter 2500, and input the preservation of host computer 1.
Step 3: disconnecting microhmmeter switch 24, closed path source switch 23 measures this by busbar joint temperature-measuring part 5
Motor busbar joint impedance R00Under temperature T00, You Wuxiang connector temperature collecting device 4 acquires, through WSN data acquisition device 10
It send host computer 11 and saves.
Step 4: repeating second step to third step n times, host computer 11 can respectively obtain motor busbar joint impedance R0iAnd
Corresponding temperature T0i, i=0,1 ... ..., n.
Step 5: repeating the first step to the 4th step repeats n times, electric current I can be obtained respectively on host computer 11iAnd it is corresponding
Busbar joint impedance RkiWith temperature Tki, i=0,1 ... ..., n, k=0,1 ... ..., n.By Ii、Rki、TkiAs modeling data, i.e.,
The graph of relation of motor busbar joint electric current as shown in Figure 3, temperature and impedance can be obtained.
Then, in host computer 1, by electric current IiWith temperature TkiInput variable, impedance R as BP neural network modelki
As the output variable of BP neural network model, construct BP neural network model R=f (I, T).
Turn-off current source switch 23 and microhmmeter switch 24 again are closed inverter switching device 26.Motor is set to be in actual motion
In the process, a motor busbar joint address is sent by WSN data acquisition device 10 by host computer 11 at this time to connect to being mounted on
Busbar joint temperature-measuring part 5 in wire box 3, busbar joint temperature-measuring part 5 acquire the temperature of corresponding busbar joint top nut, then
Host computer 11 is sent to through five phase connector temperature collecting devices 4, WSN data acquisition device 10.Host computer 11 is adopted by WSN data
Acquisition means 10 send a motor busbar joint address to five phase current acquisition devices 8 being mounted on outside terminal box 3, five phase currents
Acquisition device 8 acquires corresponding phase current, gives host computer 11 again by WSN data acquisition device 10.Host computer 11 is according to this
Temperature T and each phase current I value on busbar joint calculate motor busbar joint impedance R by relational model R=f (I, T),
Judge whether each busbar joint impedance R detects to finish, be continued to test if not detecting and finishing.Finally, respectively to each bus
Impedance R is compared with the preset high resistant threshold value VAL of host computer 11, if R > VAL, which is high resistant
Connecting fault, otherwise, the motor busbar joint are fault-free, realize the diagnosis of motor busbar joint high resistant connecting fault.
Claims (6)
- It is each in every phase bus outlet of five-phase induction motor 1. a kind of motor bus high resistance connecting fault detection device based on WSN Equipped with 1 current sensor (7), 5 current sensors (7) pass through data transmission line and 1 five phase current acquisition device (8) Connection, it is characterized in that: five phase current acquisition devices (8) transmit number by radio receiving transmitting module and WSN data acquisition device (10) According to WSN data acquisition device (10) is connected by data transmission line with host computer (11)；Each phase bus of five-phase induction motor into Outlet is connect with 1 busbar joint temperature-measuring part (5), and 5 busbar joint temperature-measuring parts (5) pass through data transmission line and 1 five Phase connector temperature collecting device (4) is connected, and five phase connector temperature collecting devices (4) are adopted by radio receiving transmitting module and WSN data Acquisition means (10) mutually transmit data；It is concatenated between the bus inlet wire (2) and bus outlet (6) of a wherein phase for five-phase induction motor real Experiment device, experimental provision are opened by current supply switch (23), continuous current source (22) and the mutually microhmmeter that concatenates mutually concatenated It is serially connected between bus inlet wire (2) and bus outlet (6) and forms after pass (24), microhmmeter (25) are in parallel.
- 2. the motor bus high resistance connecting fault detection device according to claim 1 based on WSN, it is characterized in that: institute The each busbar joint temperature-measuring part (5) stated includes an infrared temperature probe (19), and bus inlet-outlet line is wound on bolt (12) on, the top of bus inlet-outlet line, which is matched by Upper gasket (14) and top nut (13) with bolt (12), tightens bus disengaging Line, the lower section of bus inlet-outlet line matched by lower gasket (15) and lower nut (16) with bolt (12) tighten and fix bus into Outlet.Infrared temperature probe (19) faces the position of top nut (13) and does not contact with top nut (13).
- 3. the motor bus high resistance connecting fault detection device according to claim 1 based on WSN, it is characterized in that: institute The bus inlet wire (2) for the phase inlet-outlet line stated passes through inverter switching device (26) connection inverter (1).
- 4. the motor bus high resistance connecting fault detection device according to claim 1 based on WSN, it is characterized in that: 1 Five phase connector temperature collecting devices (4) and 5 busbar joint temperature-measuring parts (5) are installed in terminal box (3) inside, five phase currents It is external that acquisition device (8) is installed in connection box for motor (3).
- 5. a kind of detection method of the motor bus high resistance connecting fault detection device based on WSN as described in claim 1, It is characterized in that including the following steps:A: the BP neural network model R between motor busbar joint impedance R and each phase current I, temperature T is obtained using experimental provision =f (I, T) is simultaneously stored in host computer (11)；B: motor acquires corresponding busbar joint temperature T in actual moving process, by busbar joint temperature-measuring part (5) and through five Phase connector temperature collecting device (4), WSN data acquisition device (10) are sent to host computer (11)；By five phase current acquisition devices (8) acquire corresponding phase current I and given again host computer (11) through WSN data acquisition device (10), host computer (11) temperature T and Phase current I calculates busbar joint impedance R by BP neural network model R=f (I, T)；C: each phase busbar joint impedance R is compared with preset high resistant threshold value VAL, if R > VAL, busbar joint is height Connecting fault is hindered, otherwise fault-free.
- 6. the detection method of the motor bus high resistance connecting fault detection device according to claim 2 based on WSN, It is characterized in: in step A, the BP nerve between motor busbar joint impedance R and each phase current I, temperature T is obtained using experimental provision The step of network model R=f (I, T), is:Step 1: disconnecting inverter switching device (26) and microhmmeter switch (24), closed path source switch (23) adjusts continuous current Source (22) makes it export electric current I0, the electric current on bus inlet-outlet line is acquired by five phase current acquisition devices (8) and is sent to Host computer (11)；Step 2: turn-off current source switch (23), closure microhmmeter switch (24) adjust the impedance at busbar joint, microhmmeter (25) busbar joint impedance magnitude R is measured00And input host computer (11)；Step 3: disconnecting microhmmeter switch (24), closed path source switch (23) is measured by busbar joint temperature-measuring part (5) Busbar joint impedance R00Under temperature T00, five phase connector temperature collecting devices (4) acquisition, sent through WSN data acquisition device (10) Host computer (11)；Step 4: repeating second step to third step n times, host computer (11) obtains busbar joint impedance R0iAnd corresponding temperature T0i, i=0,1 ... ..., n；Step 5: repeating the first step to the 4th step repeats n times, host computer 11 obtains electric current IiAnd corresponding busbar joint impedance RkiWith temperature Tki, i=0,1 ... ..., n, k=0,1 ... ..., n；By electric current IiWith temperature TkiAs BP neural network model Input variable, impedance RkiBP neural network model R=f (I, T) is constructed as output variable.
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| CN112911625A (en) * | 2021-02-04 | 2021-06-04 | 重庆邮电大学 | Fault diagnosis method for deterministic time slot communication sensing node |
| CN119535206A (en) * | 2024-11-12 | 2025-02-28 | 四川航天烽火伺服控制技术有限公司 | A method and system for identifying high-resistance connection fault of a brushless DC motor |
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