CN106253232A - Open phases of three-phase power source detection method and motor phase failure protection system in a kind of motor operation - Google Patents
Open phases of three-phase power source detection method and motor phase failure protection system in a kind of motor operation Download PDFInfo
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- CN106253232A CN106253232A CN201610748515.9A CN201610748515A CN106253232A CN 106253232 A CN106253232 A CN 106253232A CN 201610748515 A CN201610748515 A CN 201610748515A CN 106253232 A CN106253232 A CN 106253232A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
Abstract
Open phases of three-phase power source detection method and motor phase failure protection system in a kind of motor operation.Provide and a kind of can detect the phase shortage under motor dynamics and static state and phase sequence quickly, reliably；Meanwhile, the pile defection protection that in electric device, motor is dynamic and static is met, it is to avoid motor is in open phases of three-phase power source detection method and motor phase failure protection system in the motor operation of improper operating condition for a long time.Comprise the following steps: N101, start, motor rotation；N102, samples to three-phase voltage, detects, it may be judged whether be 0；N103, if arbitrary phase voltage is 0 in three-phase sampled voltage, then it is assumed that phase shortage powers on；N104, if three-phase sampled voltage is not the most 0, then continues to judge that three-phase sampled voltage difference two-by-two is the most excessive；N105, if it is not, then carry out Phase sequence detection；N106, if difference is excessive, then it is assumed that be a powering up phase shortage.The present invention can detect that motor phase failure runs in real time, provides effective guarantee for reducing motor phase failure operation.
Description
Technical field
The present invention relates to ac three-phase asynchronous motor technical field, open phases of three-phase power source in running particularly to a kind of motor
Detection method and protection system.
Background technology
Often there is phase shortage phenomenon in the power supply of ac three-phase asynchronous motor, and this type of fault is difficult to be found, and causes motor long
Time is in open-phase running status and causes danger, the most both at home and abroad open phase protective device of three-phase in electric device
Pile defection can be carried out in the case of motor off-duty (static), although this device work protected to motor to a certain extent
With, but be nowhere near, in practice, the burn-down of electric motor accident of 60%～more than 70% is all caused by phase-deficient operation, and other uses and passes
Sensor such as current sensor measuring three-phase current, the protective relaying device such as air switch, relay and A.C. contactor carries out motor
The occasion of pile defection and protection can not be widely used because of shortcomings such as its environmental requirement height and space hold are big, and this relay
Protection device cost of manufacture and maintenance cost is higher, reliability is low, economic benefit is low, a kind of with low cost, be almost not required to
Want that any sensor, reliability are high, it is little to take up room, can extensively use, in motor runs (dynamically) realize power phase shortage
In real time detection thus protect the system and device of motor to become the key improving motor service life, ensureing safety in production.Phase sequence is certainly
Dynamic detection function is to ensure that another key element that motor is reliable, properly functioning, and otherwise motor operation will be out of control, directly results in equipment
Damaging, serious more can cause personal injury.In electric device, a large amount of use of three phase alternating current motor promotes motor phase failure to run
Detection becomes extremely urgent.
Summary of the invention
The present invention is directed to problem above, provide a kind of can detect quickly, reliably under motor dynamics and static state lack
Phase and phase sequence；Meanwhile, the pile defection protection that in electric device, motor is dynamic and static is met, it is to avoid motor is in anon-normal for a long time
Open phases of three-phase power source detection method and motor phase failure protection system during often the motor of operating condition runs.
The technical scheme is that and comprise the following steps:
N101, starts, motor rotation；
N102, samples to three-phase voltage, detects, it may be judged whether be 0；
N103, if arbitrary phase voltage is 0 in three-phase sampled voltage, then it is assumed that phase shortage powers on；
N104, if three-phase sampled voltage is not the most 0, then continues to judge that three-phase sampled voltage difference two-by-two is the most excessive；
N105, if it is not, then carry out Phase sequence detection；
N106, if difference is excessive, then it is assumed that be a powering up phase shortage.
Described three-phase sampled voltage is the AD value of embedded microprocessor AD conversion module.
Described three-phase sampled voltage is the meansigma methods of some high-values in sampling gained voltage.
In N104, continue to judge that described three-phase sampled voltage difference two-by-two is the most excessive and farther include:
Three-phase sampled voltage subtracts each other two-by-two and obtains three differences；
Three differences are respectively compared with common voltage threshold；
If three differences are both less than common voltage threshold, then it is assumed that be not a powering up phase shortage；
If arbitrarily not less than common voltage threshold in three differences, then it is assumed that be a powering up phase shortage.
Not three-phase sampled voltage difference sum two-by-two under non-full-phase state when common voltage threshold is motor rotation or non-operating
Meansigma methods.
In N105, three-phase power supply phase sequence detection farther includes:
If being currently not non-full-phase state；
On the basis of a wherein phase, take in this phase voltage sampled value rising edge one section；
The most whether observe the most biphase has and only a phase sampler value is 0；
If a phase is 0 to be considered as positive phase sequence in the most biphase, then another phase is 0 to be considered as negative-phase sequence.
Also include: the phase shortage flag bit that set is corresponding；
When power supply one phase phase shortage being detected, start this phase phase shortage count value；When this phase phase shortage count value reaches to count threshold,
Reset corresponding phase shortage flag bit, i.e. thinks current for non-full-phase state.
After the corresponding phase shortage flag bit that resets, also should include:
Detect when three-phase sampled voltage difference two-by-two is respectively less than common voltage threshold, the phase shortage flag bit that set is corresponding, i.e.
Think current for not non-full-phase state.
A kind of motor phase failure protection system, including electric machine controller；
Detect the state of described motor, during if be detected that be currently non-full-phase state, if motor is in operating condition, immediately to
Electric machine controller sends motor to be stopped signal and sends alarm signal；
During if be detected that be currently non-full-phase state, if motor is in non-operating state, send alarm signal the most immediately.
Wherein, detect and currently include for non-full-phase state:
During in using motor to run, described motor is run by open phases of three-phase power source detection method, open phases of three-phase power source detects；
Obtain corresponding phase shortage flag bit.
Open phases of three-phase power source detection method in the motor operation of the present invention, can detect that motor phase failure runs in real time, for
Reduce motor phase failure operation and provide effective guarantee.
Motor phase failure protection system in the present invention, system response is sensitive, is swift in motion, and components and parts used are few, wiring letter
Single, make or acquisition cost is cheap, it is not necessary to be many such as the sensor such as electric current or speed, be not required to maintenance, adapt to more severe ring
Border, to improving production efficiency and economic benefit and ensureing that safety in production is significant.
Accompanying drawing explanation
Fig. 1 is the flow chart of open phases of three-phase power source detection method during motor of the present invention runs；
Fig. 2 is the flow chart of motor phase failure of the present invention protection system；
Fig. 3 is open phases of three-phase power source detection function flow chart during motor of the present invention runs；
Fig. 3-1 is the partial enlarged drawing one of Fig. 3；
Fig. 3-2 is the partial enlarged drawing two of Fig. 3；
Fig. 4 is three-phase sampled voltage oscillogram of the present invention.
Detailed description of the invention
Describe open phases of three-phase power source detection method in the motor operation that the embodiment of the present invention proposes with reference to the accompanying drawings.
As shown in Fig. 1, during described motor runs, open phases of three-phase power source detection method comprises the following steps:
N101, starts, motor rotation；
N102, samples to three-phase voltage, detects, it may be judged whether be 0；
N103, if arbitrary phase voltage is 0 in three-phase sampled voltage, then it is assumed that phase shortage powers on；
N104, if three-phase sampled voltage is not the most 0, then continues to judge that three-phase sampled voltage difference two-by-two is the most excessive；
N105, if it is not, then carry out Phase sequence detection；
N106, if difference is excessive, then it is assumed that be a powering up phase shortage.
Concrete, pile defection algorithm comprise phase shortage power on (phase shortage power on in three-phase the most biphase have electricity time energising) and
The phase shortage that powers on two parts, when phase shortage powers on by detection Umax, Vmax, Wmax(as code name) initial value discriminate whether be 0 with
Define whether phase shortage；The phase shortage that powers on by by difference U_V two-by-two of Umax, Vmax, Wmax, V_W, W_U(as code name) with
Threshold voltage compares, it determines whether phase shortage occurs, and choosing of threshold voltage meets motor stopping and dynamic phase shortage (motor fortune simultaneously
Turn) criterion.The phase shortage phase shortage that powers on and power on all comprises motor rotation or non-operating state.
Described three-phase sampled voltage is the AD value of embedded microprocessor AD conversion module.AD sampling module precision is high, complete
Full up sufficient sampling request, sampling the data obtained judges, for phase shortage, the foundation that offer is important.
Described three-phase sampled voltage is the meansigma methods of some high-values in sampling gained voltage.When there is no phase shortage, three-phase
Maximum about the same, when there is phase shortage, three-phase imbalance, be embodied in the maximum of every phase sampler voltage occur relatively big partially
Difference, therefore takes maximum and compares；The meansigma methods taking multiple maximum is because preventing a certain item unexpected spike of appearance from causing
Erroneous judgement.
Method for detecting open phase sample magnitude is about the positive half cycle sine wave of 3V, phase 120 °, as shown in Fig. 4.Sampling
The data only intercepted near crest voltage in interval during Wave data, to reduce data processing time, increase the standard of peak value value
Really property.
Also include: the phase shortage flag bit that set is corresponding；
When power supply one phase phase shortage being detected, start this phase phase shortage count value；When this phase phase shortage count value reaches to count threshold,
Reset corresponding phase shortage flag bit, i.e. thinks current for non-full-phase state.Repeatedly count, it is achieved can be accurate during real generation phase shortage
Really catch, phase shortage information is provided in time.
After the corresponding phase shortage flag bit that resets, also should include:
Detect when three-phase sampled voltage difference two-by-two is respectively less than common voltage threshold, the phase shortage flag bit that set is corresponding, i.e.
Think current for not non-full-phase state.When not phase shortage, be converted to not non-full-phase state from non-full-phase state, it is ensured that system is properly functioning.
As shown in Fig. 3, during motor runs, open phases of three-phase power source detection function flow process is as follows:
N301, initializes, and set phase shortage flag bit is 1, and reset Phase sequence detection flag bit is 0；
N302, whether detection A phase, B phase, meansigma methods Umax of each 8 the sampled voltage maximums of C phase, Vmax, Wmax are 0 respectively
；
If the arbitrary phase of A, B, C is 0, then enter N303；
If A, B, C three-phase is not the most 0, then enter N304；
N303, that phase phase shortage count value of phase shortage adds up, and number of times is not above 20, then enter N302, and number of times is if it exceeds 20, then
Enter N306,
Meansigma methods Umax of N304, A, B, C three-phase sampled voltage, difference U_V of Vmax, Wmax, V_W, W_U are the most altogether
Same threshold, wherein:
U_V=|Umax-Vmax|；
V_W=|Vmax-Wmax|；
W_U=|Wmax-Umax|；
Not three-phase sampled voltage difference sum two-by-two flat under non-full-phase state when common voltage threshold is motor rotation or non-operating
Average；Prevent because occurring that spike in short-term causes phase shortage to be judged by accident.
If the most common threshold, then enter in N305,；
As long as if there being one then to enter in N305 not less than common threshold,；
N305, if, middle phase shortage number of times exceedes counting threshold 20, then enter N306；
If, in not phase shortage time, set phase shortage flag bit is 1, enter N307；
N306, when three-phase be all phase shortage power on or power on phase shortage time reset phase shortage be masked as 0, reset count value is 0；
N307, detects non-phase shortage, then carries out Phase sequence detection, and concrete is as follows:
With a wherein phase, on the basis of A phase, take in this phase voltage sampled value rising edge one section,
The most whether observe the most biphase has and only a phase sampler value is 0, if in the most biphase,
B phase is 0 to be considered as positive phase sequence；
C phase is 0 to be considered as negative-phase sequence；
Having detected phase sequence, set phase sequence flag bit is 1, enters N304；
The N307 part of Fig. 3 is Phase sequence detection；The advantage of Phase sequence detection is to form dividing potential drop chopper circuit by resistance and diode,
Circuit is simple, it is not necessary to excess sensor device and relay, coordinates the software program of microprocessor to judge, it is achieved Phase sequence detection,
Software is simple, the highest to the performance requirement of microprocessor.
Open phases of three-phase power source detection method in motor operation according to embodiments of the present invention, three-phase input power (380V) electricity
Pressure detection range can be from-20%～+10%, and detection accuracy is high, reliable, stable.
A kind of motor phase failure protection system, including electric machine controller；
Detect the state of described motor, during if be detected that be currently non-full-phase state, if motor is in operating condition, immediately to
Electric machine controller sends motor to be stopped signal and sends alarm signal；
During if be detected that be currently non-full-phase state, if motor is in non-operating state, send alarm signal the most immediately.Even if
Motor does not runs, and when there is phase shortage, stops motor again to run, until open-phase fault is got rid of.
Wherein, detect and currently include for non-full-phase state:
During in using motor to run, described motor is run by open phases of three-phase power source detection method, open phases of three-phase power source detects；
Obtain corresponding phase shortage flag bit.Send phase shortage according to phase shortage flag bit to report to the police, it is to avoid system is work under non-full-phase state
Make, cause damage.
As in figure 2 it is shown, motor phase failure protection system in the present invention, comprise the following steps:
N201, corresponding phase shortage flag bit described in set is 1, i.e. thinks current for not non-full-phase state；
N202, uses said method to detect when described power supply electrifying phase shortage or phase shortage power on；
N203, starts this phase phase shortage count value and adds 1；
N204, when this phase phase shortage count value reaches to count threshold 20, the described corresponding phase shortage flag bit that resets is 0, resets
This phase phase shortage count value is 0 i.e. thinks to be currently non-full-phase state；
N205, detects the state of described motor, during if be detected that be currently non-full-phase state；
N206, if motor is in operating condition, sends motor to electric machine controller immediately and stops signal；
N207, during if be detected that be currently non-full-phase state, if motor is in non-operating state, sends alarm signal the most immediately
Number.
Motor phase failure protection system according to embodiments of the present invention, system response is sensitive, is swift in motion, components and parts used
Few, wiring is simple, makes or acquisition cost is cheap, it is not necessary to many such as the sensor such as electric current or speed, is substantially not required to maintenance, can fit
Answer relatively rugged environment, to improving production efficiency and economic benefit and ensureing that safety in production is significant.
Compared to relay protection dresses such as existing pile defection technology many employings current sensor, relay and A.C. contactors
Putting with the use of carrying out pile defection in motor operation, the program is big due to space hold volume, and inconvenience is applied to equipment body
Long-pending and sealing has the occasion of strict demand, the circuit board small volume of main part of the present invention, it is simple to sealing, input is three
Three-phase power line, is output as phase shortage and judging phase order totally two holding wires, and use process is without complicated wiring and can reliably transport
OK.
Claims (10)
1. open phases of three-phase power source detection method during a motor runs, it is characterised in that comprise the following steps:
N101, starts, motor rotation；
N102, samples to three-phase voltage, detects, it may be judged whether be 0；
N103, if arbitrary phase voltage is 0 in three-phase sampled voltage, then it is assumed that phase shortage powers on；
N104, if three-phase sampled voltage is not the most 0, then continues to judge that three-phase sampled voltage difference two-by-two is the most excessive；
N105, if it is not, then carry out Phase sequence detection；
N106, if difference is excessive, then it is assumed that be a powering up phase shortage.
2. open phases of three-phase power source detection method in running according to a kind of motor described in claim 1, it is characterised in that
Described three-phase sampled voltage is the AD value of embedded microprocessor AD conversion module.
3. open phases of three-phase power source detection method in running according to a kind of motor described in claim 1, it is characterised in that described
Three-phase sampled voltage is the meansigma methods of some high-values in sampling gained voltage.
4. open phases of three-phase power source detection method in running according to a kind of motor described in claim 1, it is characterised in that N104
In, continue to judge that described three-phase sampled voltage difference two-by-two is the most excessive and farther include:
Three-phase sampled voltage subtracts each other two-by-two and obtains three differences；
Three differences are respectively compared with common voltage threshold；
If three differences are both less than common voltage threshold, then it is assumed that be not a powering up phase shortage；
If arbitrarily not less than common voltage threshold in three differences, then it is assumed that be a powering up phase shortage.
5. open phases of three-phase power source detection method in running according to a kind of motor described in claim 4, it is characterised in that common
The not meansigma methods of three-phase sampled voltage difference sum two-by-two under non-full-phase state when voltage threshold is motor rotation or non-operating.
6. open phases of three-phase power source detection method in running according to a kind of motor described in claim 1, it is characterised in that N105
In, three-phase power supply phase sequence detection farther includes:
If being currently not non-full-phase state；
On the basis of a wherein phase, take in this phase voltage sampled value rising edge one section；
The most whether observe the most biphase has and only a phase sampler value is 0；
If a phase is 0 to be considered as positive phase sequence in the most biphase, then another phase is 0 to be considered as negative-phase sequence.
7. open phases of three-phase power source detection method in running according to a kind of motor described in claim 1, it is characterised in that
Also include: the phase shortage flag bit that set is corresponding；
When power supply one phase phase shortage being detected, start this phase phase shortage count value；When this phase phase shortage count value reaches to count threshold,
Reset corresponding phase shortage flag bit, i.e. thinks current for non-full-phase state.
8. open phases of three-phase power source detection method in running according to a kind of motor described in claim 7, it is characterised in that multiple
After the phase shortage flag bit that position is corresponding, also should include:
Detect when three-phase sampled voltage difference two-by-two is respectively less than common voltage threshold, the phase shortage flag bit that set is corresponding, i.e.
Think current for not non-full-phase state.
9. a motor phase failure protection system, it is characterised in that include electric machine controller；
Detect the state of described motor, during if be detected that be currently non-full-phase state, if motor is in operating condition, immediately to
Electric machine controller sends motor to be stopped signal and sends alarm signal；
During if be detected that be currently non-full-phase state, if motor is in non-operating state, send alarm signal the most immediately.
A kind of motor phase failure protection system the most according to claim 9, it is characterised in that wherein, detect to be currently scarce
Phase state includes:
Use as described in arbitrary in claim 1-8 motor operation in open phases of three-phase power source detection method to as described in motor run
Middle open phases of three-phase power source detects；
Obtain corresponding phase shortage flag bit.
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| CN201610748515.9A CN106253232B (en) | 2016-08-26 | 2016-08-26 | Open phases of three-phase power source detection method and motor phase failure protect system in a kind of motor operation |
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|---|---|---|---|
| CN201610748515.9A CN106253232B (en) | 2016-08-26 | 2016-08-26 | Open phases of three-phase power source detection method and motor phase failure protect system in a kind of motor operation |
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| CN112072979A (en) * | 2020-09-09 | 2020-12-11 | 扬州电力设备修造厂有限公司 | Electromagnetic type torque testing method and system for electric actuator |
| CN112068024A (en) * | 2020-09-30 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Fault detection method and fault detection circuit for three-phase alternating current source |
| CN113687151A (en) * | 2021-08-24 | 2021-11-23 | 合肥美的暖通设备有限公司 | Phase-loss detection method, device, drive circuit, motor, electrical equipment and medium |
| CN114720785A (en) * | 2022-06-13 | 2022-07-08 | 中山大洋电机股份有限公司 | Motor with three-phase power supply open-phase detection function and power supply open-phase detection method |
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| Publication number | Publication date |
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| CN106253232B (en) | 2018-07-20 |
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