CN108649535A - motor protection method and system - Google Patents
motor protection method and system Download PDFInfo
- Publication number
- CN108649535A CN108649535A CN201810558369.2A CN201810558369A CN108649535A CN 108649535 A CN108649535 A CN 108649535A CN 201810558369 A CN201810558369 A CN 201810558369A CN 108649535 A CN108649535 A CN 108649535A
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- Prior art keywords
- motor
- electric current
- load motor
- load
- current
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a kind of motor protection method and systems.Wherein, which includes：At least one load motor；Current transformer is connect with each load motor, for detecting the electric current on each load motor；Motor protecter is connect with current transformer, in the case of meeting preset failure protective condition for the electric current on load motor, disconnects the electric current on load motor；Wherein, actuation time of the actuation time of the execution protection act of motor protecter less than the service entrance switch between at least one load motor and power supply.The present invention solves the prior art and is merely able to play overload protection and the technical issues of can not protect short trouble to carry out circuit protection to motor device using electrothermal relay.
Description
Technical field
The present invention relates to industrial equipment control fields, in particular to a kind of motor protection method and system.
Background technology
In this field, motor is very important an equipment, for converting electrical energy into mechanical energy, as various electricity consumptions
The power source of device or various machineries.For example, in desulphurization system, desulfurization Special disc is used to provide weight for the administrative electrical equipment of desulfurization
It includes 2 oil pump electricity in 4 booster fan cooling fan motors, booster fan wind turbine oil system to want electrical source of power, load
6 agitator motors in 2 Oil pump electrical machineries, absorption towers, 3 slurry circulating pump deceleration lubricating oil pump in mechanical, electrical lubricating oil system
Motor, limestone slurry liquid pump motor, 2 frequency conversion batchers, belt motor, gypsum discharge pump motor, filtrate pump motor etc., these
The power of desulphurization plant is differed from 1.1KW to 55KW.Once these desulphurization plant dead electricity, it is possible to cause entire desulphurization system
It stops transport, and then forces unit outage.Therefore the safe and stable operation of desulfurization Special disc, it is most important to the operation of desulphurization system.
Currently, in existing desulphurization system, motor load circuit is all made of electrothermal relay to carry out overload protection.Heat after
Electric appliance is the fuel factor principle using electric current, cuts off motor circuit when there is overload that motor cannot be born, is electronic
Machine provides the protection electric appliance of overload protection.Fig. 1 is a kind of optional electrothermal relay principle schematic according to prior art, is such as schemed
Shown in 1, when carrying out overload protection to motor using electrothermal relay, thermal element is connected with the stator winding of motor, it will be hot
The normally closed interlock of relay is connected in the control circuit of the electromagnetic coil of A.C. contactor, and is adjusted setting current and adjusted rotation
Button makes herringbone driving lever with push rod at a distance of a suitable distance.When electric motor normal working, the electric current by thermal element is electricity
The rated current of motivation, thermal element fever are bent after bimetal leaf is heated, push rod are made just to be contacted with herringbone driving lever, and
Herringbone driving lever cannot be pushed.Normally closed interlock is in closed state, and A.C. contactor keeps being attracted, motor normal operation.If
There are overload situations in motor, and electric current increases in winding, makes bimetallic temperature by the electric current increase in electrothermal relay element
Higher is risen to obtain, bending degree increases, and pushes herringbone driving lever, herringbone driving lever to push normally closed interlock, contact is made to disconnect and disconnect
Ac contactor coil circuit, the power supply for making contactor release, cutting off motor, motor stop and are protected.Hot relay
The effect of device other parts is as follows：The left arm of herringbone driving lever is also made of bimetal leaf, main when environment temperature changes
Bimetal leaf in circuit will produce certain bending, and at this moment equidirectional deformation can also occur for the left arm of herringbone driving lever
Bending ensures electrothermal relay accuracy of action to make the distance between herringbone driving lever and push rod be held essentially constant.This
Kind effect claims temperature compensation function.The setting valve of electrothermal relay can be equal to the rated current of 0.95~1.05 times of motor, or
Person takes the intermediate value of electrothermal relay setting current to be equal to the rated current of motor, is then adjusted.The heat of electrothermal relay
Transmission needs longer time, and therefore, electrothermal relay cannot act as the short-circuit protection of motor device, and can only be used as overload and protect
Shield.
It is merely able to play overload guarantor to carry out circuit protection to motor device using electrothermal relay for the above-mentioned prior art
The problem of protecting and can not being protected to short trouble, currently no effective solution has been proposed.
Invention content
An embodiment of the present invention provides a kind of motor protection method and systems, and hot relay is used at least to solve the prior art
Device is asked to carry out the technology that circuit protection is merely able to play overload protection and can not protect short trouble to motor device
Topic.
One side according to the ... of the embodiment of the present invention provides a kind of protection system for motor, including：At least one load electricity
Machine；Current transformer is connect with each load motor, for detecting the electric current on each load motor；Motor protecter, with electricity
Current transformer connects, and in the case of meeting preset failure protective condition for the electric current on load motor, disconnects load motor
On electric current；Wherein, the actuation time of the execution protection act of motor protecter is less than at least one load motor and power supply electricity
The actuation time of service entrance switch between source.
Another aspect according to the ... of the embodiment of the present invention additionally provides a kind of motor protection method, including：Detection is at least one
Electric current on load motor；Judge whether the electric current of load motor meets preset failure protective condition；In the electric current of load motor
In the case of meeting preset failure protective condition, the electric current on load motor is disconnected in preset time；Wherein, preset time is low
The actuation time of service entrance switch between at least one load motor and power supply.
Another aspect according to the ... of the embodiment of the present invention additionally provides a kind of electric motor protective device, including：Detection unit is used
Electric current on at least one load motor of detection；Judging unit, for judging whether the electric current of load motor meets default event
Hinder protective condition；Execution unit, in the case where the electric current of load motor meets preset failure protective condition, when default
The interior electric current disconnected on load motor；Wherein, preset time less than between at least one load motor and power supply into
The actuation time of wiretap.
In embodiments of the present invention, using actuation time less than the actuation time of service entrance switch motor protecter come to extremely
A kind of few motor of load is protected, and is detected on each load motor by the current transformer being connect with each load motor
Electric current, and in the case where the electric current on load motor meets preset failure protective condition, disconnected by motor protecter
Electric current on load motor has achieved the purpose that carry out short trouble protection to the motor of load, has ensured big work(to realize
The technique effect of tripping of will not bypassing the immediate leadership when short trouble occurs for rate motor load, and then solves the prior art and use electrothermal relay
It is merely able to play overload protection and the technical issues of short trouble can not be protected to carry out circuit protection to motor device.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is a kind of optional electrothermal relay principle schematic according to prior art；
Fig. 2 is a kind of protection system for motor schematic diagram according to the ... of the embodiment of the present invention；
Fig. 3 is a kind of optional protection system for motor schematic diagram according to the ... of the embodiment of the present invention；
Fig. 4 is a kind of motor protection method flow chart according to the ... of the embodiment of the present invention；And
Fig. 5 is a kind of electric motor protective device schematic diagram according to the ... of the embodiment of the present invention.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
It includes to be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment to cover non-exclusive
Those of clearly list step or unit, but may include not listing clearly or for these processes, method, product
Or the other steps or unit that equipment is intrinsic.
Embodiment 1
According to embodiments of the present invention, a kind of protection system for motor embodiment is provided, Fig. 2 is according to the ... of the embodiment of the present invention
A kind of protection system for motor schematic diagram, as shown in Fig. 2, the system includes：At least one load motor 201, current transformer 203
With motor protecter 205.
Wherein, at least one load motor 201；
Current transformer 203 is connect with each load motor, for detecting the electric current on each load motor；
Motor protecter 205, connect with current transformer, meets preset failure protection for the electric current on load motor
In the case of condition, the electric current on load motor is disconnected；
Wherein, the actuation time of the execution protection act of motor protecter is less than at least one load motor and power supply
Between service entrance switch actuation time.
As a kind of optional embodiment, above-mentioned load motor can be monophase machine, can also be three phase electric machine, example
Such as, the motor of any one following load can be but not limited to：Electric fan, refrigerator, washing machine, air-conditioning, hair dryer, dust suction
Device, kitchen ventilator, dish-washing machine, electric sewer and it is various industry manufacture, process equipment motor, a kind of optional embodiment
In, can be the motor of each desulphurization plant in desulphurization system.Above-mentioned current sensor is according to electromagnetic induction principle by primary side
High current is converted into secondary side low current to measure, and can be examined to the electric current on some powerful load motors
It surveys, to make up the smaller problem of motor protecter detection current range.
It should be noted that by taking desulphurization system as an example, the prior art uses click of the electrothermal relay to various desulphurization plants
(i.e. load motor) carries out overload protection, since electrothermal relay action has delay, for short trouble, and the electric current on load motor
It is very big, the service entrance switch of primary side can be made to be preferable over electrothermal relay disconnection, and then entire desulphurization system is caused to power off.And this Shen
Please above-described embodiment, load motor is protected less than the motor protecter of the actuation time of service entrance switch using actuation time
Shield, is quick on the draw, and for short trouble, the electric current on the motor that short trouble occurs can be disconnected prior to service entrance switch, into
And it avoids heavy-duty motor load there is a phenomenon where trippings of bypassing the immediate leadership when short trouble.
From the foregoing, it will be observed that in the above embodiments of the present application, using actuation time less than the electricity of the actuation time of service entrance switch
Machine protector protects the motor of at least one load, passes through the current transformer connecting with each load motor and detects
Electric current on each load motor, and in the case where the electric current on load motor meets preset failure protective condition, pass through
Motor protecter disconnects the electric current on load motor, has achieved the purpose that carry out short trouble protection to the motor of load, to
The technique effect for the tripping that ensures to bypass the immediate leadership when short trouble occurs for heavy-duty motor load is realized, and then solves existing skill
Art is merely able to play overload protection and can not be carried out to short trouble using electrothermal relay to carry out circuit protection to motor device
The technical issues of protection.
By taking desulphurization system as an example, in a kind of optional embodiment, above-mentioned load motor can be it is following any one or
The motor of a variety of desulphurization plants：The cooling fan motor of booster fan, Oil pump electrical machinery, the dynamo oil of booster fan wind turbine oil system
The Oil pump electrical machinery of system, the agitator motor on absorption tower, slurry circulating pump speed reducer Oil pump electrical machinery, limestone slurry liquid pump motor,
Motor, belt motor, gypsum discharge pump motor, the filtrate pump motor of frequency conversion batcher.
It should be noted that by 3BJK sections of #3 machines desulfurization Special disc for for #3 units, desulfurization absorption tower stirrer electricity
Electric cable impedance is 0.2 ohm, and when short trouble occurs, fault current is about in 2000A or so, and service entrance switch is ABB
SACE s7, protection are set as 2500A, 2s action.Thus, when desulfurization absorption tower stirrer motor due into slurry or cable
When short trouble, if the protection in motor load circuit is electrothermal relay, action is sluggish, and service entrance switch can be dynamic prior to electrothermal relay
Make, to cause entire desulphurization system breaking dead electricity.
In order to solve the scheme for using electrothermal relay to carry out overload protection to motor in the prior art, set in high power load
Preparation is susceptible to the problem of bypassing the immediate leadership tripping when giving birth to short trouble, the motor protecter of selection should meet following condition：
(1) motor protecter should have sensitive inverse time-lag protection, and actuation time is much smaller than higher level's switch motion value, makes
When it protects load that the transient high-currents failures such as short circuit, stall occur, it can switch and disconnect prior to higher level；
(2) power supply drawer space is narrow, and protector answers small volume, is not take up a large amount of spacial influence heat dissipations；
(3) information such as motor running condition such as electric current, voltage, frequency can directly display, convenient for monitoring in real time on the spot；
(4) motor is because that should be able to automatically record fault message after failure break, and intuitive and easy to understand, easy-to-look-up maintenance.
In a kind of optional embodiment, Schneider iFMS-WRDUWQ motor protecters may be used, parameter is as follows：
(1) using seperated window type.
(2) defencive function：Overcurrent, undercurrent, phase shortage, anti-phase, stall, stall, current imbalance, short circuit.
Multi-functional electric motor protecting current range is up to 80A (time delay over-current value).
Overheat inverse time current-time response protection (within 32A).
Additional function：Power down protection, Cumulative Elapsed Time, the last record of failure cause three times and limitation are restarted.
Communication modes：Modbus/RS-485.
Strengthen function for monitoring：Monitoring distance is up to 400 meters, the cycle display of three-phase electricity flow valuve.
Current amplitude display bar and trip reason are shown.
It is applicable to the protection of single-phase and three phase electric machine.
Even if stiling provide normal defencive function for the split type display panel that is not connected to.
(3) technical indicator
The technical parameter of 1 i3MS/iFMS circuit brakes of table
As a kind of optional embodiment, by taking iFMS-WRDUWQ motor protecters as an example, 47-48 terminals are breaking coil
Terminal can be serially connected by 220V power supplys and motor three-phase breaker breaking coil, ensure drawer switch energy when failure
Action in time, while preventing the excessive generation of electric current from drastically generating heat and burning out contacts of contactor.
It should be noted that since split type iFMS-WRDUWQ motor protecters itself CT is only able to detect 0.5~32A,
It needs to use external mutual inductor more than 20A or more, so suitable current transformer should separately be matched to increase its detection range.Cause
And as an alternative embodiment, may be usedCurrent transformer expands protection range.
In specific implementation process, first, size is measured, the circular hole in 65 aperture Φ is bored on load drawer door-plate,
Display panel is mounted on door-plate as required, RS-485 cables be used in combination that it is connected with motor protecter；Replace load drawer
The cable of U, V, W 3-phase plug is each passed through three mother rib lateral rotundums of current transformer by an interior outgoing line plug, then from
Mutual inductor secondary side draws three pairs of only strands respectively, and corresponding phase sequence passes through in three holes CT of iFMS-WRDUWQ motor protecters
And it is formed into a loop.Guide rail is installed after connecting other terminal connections, protector and current transformer are secured firmly to drawout cubicle
Side wall prevents from falling in operation.
Based on above-described embodiment, as an alternative embodiment, after the completion of control loop transformation, it should be according to motor
Parameter listed by nameplate is configured motor protecter parameter, optionally, above-mentioned preset failure protective condition include it is following at least
One of：Overcurrent fault protective condition, open-phase fault protective condition, anti-phase failsafe condition, loses undercurrent failsafe condition
Fast failsafe condition, stall failsafe condition, current imbalance failsafe condition, short trouble protective condition；
Wherein, overcurrent fault protective condition is the first current value that the electric current on load motor is more than setting；Undercurrent event
It is second current value of the electric current on load motor less than setting to hinder protective condition, wherein the second current value is less than the first electric current
Value；Open-phase fault protective condition is super for the phase current of any one phase in the three-phase current of load motor and the ratio of maximum phase current
Cross the second predetermined threshold value；Anti-phase failsafe condition is that the phase sequence of the three-phase current of load motor is reciprocal；Stall error protection item
Part is that electric current of the load motor in start-up course is more than third current value；Third current value is preset for the first of the first current value
Multiple；Stall failsafe condition is that the electric current of load motor in the process of running is more than third current value；Third current value is
Second preset multiple of the first current value；Current imbalance failsafe condition is maximum mutually electricity in the three-phase current of load motor
Stream is more than the second predetermined threshold value with the difference of minimum phase current and the ratio rate of maximum phase current；Short trouble protective condition loads
The electric current of motor is more than the 4th current value, wherein the 4th current value is the third preset multiple of the first current value.
In a kind of optional embodiment, table 2 is the arrange parameter of iFMS-WRDUWQ motor protecters.
Table 2
In a kind of optional embodiment, as shown in figure 3, above system further includes：Control device 707, with electric motor protecting
Device 205 connects, for running parameter of the motor protecter under each failsafe condition to be arranged, wherein running parameter includes：
The actuation time of current value, motor protecter execution protection act that electric current on load motor meets.
In a kind of optional embodiment, as shown in figure 3, above system further includes：Timer 709, with motor protecter
205 connections, the fault time of preset failure protective condition is met for recording load motor；Wherein, motor protecter is additionally operable to
In the case where load motor meets preset failure protective condition, and fault time reaches motor protecter and is protected in preset failure
In the case of actuation time under the conditions of shield, the electric current on load motor is disconnected.
In a kind of optional embodiment, as shown in figure 3, above system further includes：Monitoring device 711, at least one
Load motor 201 connects, the motor operation information for monitoring at least one load motor, wherein motor operation information includes
It is at least one following：Current information, information of voltage and frequency information；Wherein, monitoring device is additionally operable to record at least one load
The fault message of motor, wherein above-mentioned monitoring device 711 is also connect with motor protecter 205.
History breaking situation of 3BJK sections of the #3 machines desulfurization Special disc before transformation is as shown in table 3, has occurred 4 altogether since putting into operation
Secondary breaking accident of bypassing the immediate leadership because of single load failure, hidden danger is brought to the safe and stable operation of #3 units.
3 all previous breaking dead electricity situation of table：
Experiment proves that 3BJK sections of #3 machines desulfurization Special disc after transformation is completed to put into operation, occurred successively several 30KW and
The above electric motor short circuit accident, but do not occurred trip phenomenon of bypassing the immediate leadership, in practice it has proved that, improved motor protecter can and
When tripping load primary power source switch, quick disengagement failure electric current avoids bypassing the immediate leadership and tripping and be burnt in circuit because moment overheats
Other electrical equipments achieve good effect.
In desulphurization system operation, when serious short circuit even burning fault has occurred in single load, protector energy
It is enough in time to cut off failure load, the desulfurization disk cabinet dead electricity because of caused by tripping of bypassing the immediate leadership is avoided, while avoiding that unit is caused to stop
Fortune；Each phase operating index of motor can be directly observed by protector panel in the normal start-stop of load, operating, facilitates operation people
Member judges；It is able to record fault message after load failure, maintains easily personnel and understand failure cause, analyze failure classes
Type improves overhaul efficiency.
Embodiment 2
According to embodiments of the present invention, a kind of motor protection method embodiment is provided, it should be noted that in the stream of attached drawing
The step of journey illustrates can execute in the computer system of such as a group of computer-executable instructions, although also, flowing
Logical order is shown in journey figure, but in some cases, it can be with different from shown or described by sequence execution herein
The step of.
Fig. 4 is a kind of motor protection method flow chart according to the ... of the embodiment of the present invention, as shown in figure 4, this method includes such as
Lower step：
Step S802 detects the electric current at least one load motor；
Step S804, judges whether the electric current of load motor meets preset failure protective condition；
Step S806 breaks in the case where the electric current of load motor meets preset failure protective condition in preset time
Open the electric current on load motor；Wherein, preset time is less than the service entrance switch between at least one load motor and power supply
Actuation time.
From the foregoing, it will be observed that in the above embodiments of the present application, by detecting the electric current at least one load motor, and judge
Whether the electric current of load motor meets preset failure protective condition, meets preset failure protective condition in the electric current of load motor
In the case of, before service entrance switch executes protection act, the electric current on the load motor is disconnected, has reached the motor progress to load
The purpose of short trouble protection, the skill for the tripping that will not bypass the immediate leadership when ensureing that short trouble occurs for heavy-duty motor load to realize
Art effect, and then solve the prior art and be merely able to play overload guarantor to carry out circuit protection to motor device using electrothermal relay
The technical issues of protecting and short trouble can not being protected.
In a kind of optional embodiment, in the case where the electric current of load motor meets preset failure protective condition,
The electric current on load motor is disconnected in preset time, may include：Meet preset failure protective condition in the electric current of load motor
In the case of, the electric current on load motor is disconnected in preset time by control circuit protector, which includes：
Step 1 obtains the actuation time of the execution protection act of circuit brake under preset failure protective condition；
Whether step 2, the fault time that detection load motor meets preset failure protective condition reach preset failure protection
Under the conditions of circuit brake execution protection act actuation time；
Step 3, the fault time that preset failure protective condition is met in load motor reach under preset failure protective condition
In the case of the actuation time of the execution protection act of circuit brake, control circuit protector disconnects the electricity on load motor
Stream.
In a kind of optional embodiment, above-mentioned preset failure protective condition includes at least one following：Overcurrent fault
Protective condition, undercurrent failsafe condition, open-phase fault protective condition, anti-phase failsafe condition, stall failsafe condition,
Stall failsafe condition, current imbalance failsafe condition, short trouble protective condition；Wherein, in the electricity of load motor
In the case that stream meets preset failure protective condition, disconnected in preset time the electric current on load motor include it is following arbitrary it
One：
In the case where the electric current of load motor meets overcurrent fault protective condition, disconnected in the first preset time negative
Carry the electric current on motor；
In the case where the electric current of load motor meets undercurrent failsafe condition, load is disconnected in the second preset time
Electric current on motor；
In the case where the electric current of load motor meets anti-phase failsafe condition, load is disconnected in third preset time
Electric current on motor；
In the case where the electric current of load motor meets stall failsafe condition, load is disconnected in the 4th preset time
Electric current on motor；
In the case where the electric current of load motor meets stall failsafe condition, load is disconnected in the 5th preset time
Electric current on motor；
In the case where the electric current of load motor meets current imbalance failsafe condition, break in the 6th preset time
Open the electric current on load motor；
In the case where the electric current of load motor meets short trouble protective condition, load is disconnected in the 7th preset time
Electric current on motor.
In a kind of optional embodiment, the above method can also include the following steps：
Step S808 monitors the motor operation information of at least one load motor, wherein motor operation information includes as follows
At least one：Current information, information of voltage and frequency information；
Step S810 records the fault message of load motor in the case of motor operation Information abnormity.
Embodiment 3
According to embodiments of the present invention, a kind of device embodiment for realizing above-mentioned motor protection method, Fig. 5 are additionally provided
It is a kind of electric motor protective device schematic diagram according to the ... of the embodiment of the present invention, as shown in figure 5, the device includes：Detection unit 901,
Judging unit 903 and execution unit 905.
Wherein, detection unit 901, for detecting the electric current at least one load motor；
Judging unit 903, for judging whether the electric current of load motor meets preset failure protective condition；
Execution unit 905, in the case where the electric current of load motor meets preset failure protective condition, when default
The interior electric current disconnected on load motor；
Wherein, actuation time of the preset time less than the service entrance switch between at least one load motor and power supply.
Herein it should be noted that above-mentioned detection unit 901, judging unit 903 and execution unit 905 correspond to embodiment
Step S202 to S206 in 1, above-mentioned module is identical as example and application scenarios that corresponding step is realized, but is not limited to
State 1 disclosure of that of embodiment.It should be noted that above-mentioned module can be in such as one group of calculating as a part of of device
It is executed in the computer system of machine executable instruction.
From the foregoing, it will be observed that in the above embodiments of the present application, detected at least one load motor by detection unit 901
Electric current, and judge whether the electric current of load motor meets preset failure protective condition by judging unit 903, pass through execution unit
905 in the case where the electric current of load motor meets preset failure protective condition, before service entrance switch executes protection act, disconnects
Electric current on the load motor has achieved the purpose that carry out short trouble protection to the motor of load, ensure greatly to realize
The technique effect of tripping of will not bypassing the immediate leadership when short trouble occurs for power motor load, and then solves the prior art and use hot relay
Device is asked to carry out the technology that circuit protection is merely able to play overload protection and can not protect short trouble to motor device
Topic.
In a kind of optional embodiment, above-mentioned execution unit is additionally operable to meet preset failure guarantor in the electric current of load motor
In the case of guard strip part, the electric current on load motor, the execution unit are disconnected in preset time by control circuit protector
Including：Acquisition module, the actuation time of the execution protection act for obtaining circuit brake under preset failure protective condition；Inspection
Module is surveyed, whether the fault time for meeting preset failure protective condition for detecting load motor reaches preset failure protective condition
The actuation time of the execution protection act of lower circuit brake；Control module, for meeting preset failure protection in load motor
The fault time of condition reaches the case where actuation time of execution protection act of circuit brake under preset failure protective condition
Under, control circuit protector disconnects the electric current on load motor.
In a kind of optional embodiment, above-mentioned preset failure protective condition includes at least one following：Overcurrent fault
Protective condition, undercurrent failsafe condition, open-phase fault protective condition, anti-phase failsafe condition, stall failsafe condition,
Stall failsafe condition, current imbalance failsafe condition, short trouble protective condition；Wherein, above-mentioned execution unit packet
It includes one of arbitrary as follows：First execution module, for the case where the electric current of load motor meets overcurrent fault protective condition
Under, the electric current on load motor is disconnected in the first preset time；Second execution module meets for the electric current in load motor
In the case of undercurrent failsafe condition, the electric current on load motor is disconnected in the second preset time；Third execution module is used
In in the case where the electric current of load motor meets anti-phase failsafe condition, disconnected on load motor in third preset time
Electric current；4th execution module, it is pre- the 4th in the case where the electric current of load motor meets stall failsafe condition
If disconnecting the electric current on load motor in the time；5th execution module is protected for meeting stall failure in the electric current of load motor
In the case of guard strip part, the electric current on load motor is disconnected in the 5th preset time；6th execution module, in load electricity
In the case that the electric current of machine meets current imbalance failsafe condition, the electricity on load motor is disconnected in the 6th preset time
Stream；7th execution module, in the case where the electric current of load motor meets short trouble protective condition, when the 7th is default
The interior electric current disconnected on load motor.
In a kind of optional embodiment, above-mentioned apparatus further includes：Monitoring unit, for monitoring at least one load motor
Motor operation information, wherein motor operation information includes at least one following：Current information, information of voltage and frequency information；
Recording unit, in the case of motor operation Information abnormity, recording the fault message of load motor.
The prior art carries out the overload protection of load motor using electrothermal relay, since electrothermal relay has delay, for short
Road failure, the electric current on load motor is excessive, and service entrance switch can be made to be preferable over electrothermal relay disconnection, and then causes equipment disconnected
Electricity.
The present invention uses the motor protecter of Schneider, is quick on the draw, can be for short trouble, can be prior to inlet wire
Switch disconnects the electric current on the motor that short trouble occurs, and principle is the actuation time of the motor protecter of Schneider, to be less than
The actuation time of service entrance switch.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
In the above embodiment of the present invention, all emphasizes particularly on different fields to the description of each embodiment, do not have in some embodiment
The part of detailed description may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, for example, the unit division, Ke Yiwei
A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
On unit.Some or all of unit therein can be selected according to the actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes：USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can to store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of protection system for motor, which is characterized in that including：
At least one load motor；
Current transformer is connect with each load motor, for detecting the electric current on each described load motor；
Motor protecter is connect with the current transformer, and meeting preset failure for the electric current on the load motor protects
In the case of guard strip part, the electric current on the load motor is disconnected；
Wherein, the actuation time of the execution protection act of the motor protecter is less than at least one load motor and power supply
The actuation time of service entrance switch between power supply.
2. system according to claim 1, which is characterized in that the load motor is any one or more following desulfurization
The motor of equipment：The oil of the cooling fan motor of booster fan, the Oil pump electrical machinery of booster fan wind turbine oil system, motor oil system
Pump motor, the agitator motor on absorption tower, slurry circulating pump speed reducer Oil pump electrical machinery, limestone slurry liquid pump motor, frequency conversion feed
Motor, belt motor, gypsum discharge pump motor, the filtrate pump motor of machine.
3. system according to claim 1, which is characterized in that the preset failure protective condition include it is following at least it
One：Overcurrent fault protective condition, undercurrent failsafe condition, open-phase fault protective condition, anti-phase failsafe condition, stall
Failsafe condition, stall failsafe condition, current imbalance failsafe condition, short trouble protective condition；
Wherein, the overcurrent fault protective condition is the first current value that the electric current on the load motor is more than setting；
The undercurrent failsafe condition is second current value of the electric current on the load motor less than setting, wherein described
Second current value is less than first current value；
Phase current and maximum mutually electricity of the open-phase fault protective condition for any one phase in the three-phase current of the load motor
The ratio of stream is more than the second predetermined threshold value；
The anti-phase failsafe condition is that the phase sequence of the three-phase current of the load motor is reciprocal；
The stall failsafe condition is that electric current of the load motor in start-up course is more than third current value；Described
Three current values are the first preset multiple of first current value；
The stall failsafe condition is that the electric current of the load motor in the process of running is more than third current value；Described
Three current values are the second preset multiple of first current value；
The current imbalance failsafe condition is maximum phase current in the three-phase current of the load motor and minimum mutually electricity
The difference of stream and the ratio rate of the maximum phase current are more than the second predetermined threshold value；
The electric current of load motor described in the short trouble protective condition is more than the 4th current value, wherein the 4th current value
For the third preset multiple of first current value.
4. system according to claim 3, which is characterized in that the system also includes：
Control device, for running parameter of the motor protecter under each failsafe condition to be arranged, wherein the work
Include as parameter：The action of current value, motor protecter execution protection act that electric current on the load motor meets
Time.
5. system according to claim 4, which is characterized in that the system also includes：
Timer is connect with the motor protecter, meets the preset failure protective condition for recording the load motor
Fault time；
Wherein, the motor protecter is additionally operable in the case where the load motor meets the preset failure protective condition,
And in the case that the fault time reaches actuation time of the motor protecter under the preset failure protective condition,
Disconnect the electric current on the load motor.
6. system according to claim 1, which is characterized in that the system also includes：
Monitoring device is connect at least one load motor, and the motor for monitoring at least one load motor is transported
Row information, wherein the motor operation information includes at least one following：Current information, information of voltage and frequency information；
Wherein, the monitoring device is additionally operable to record the fault message of at least one load motor.
7. a kind of motor protection method, which is characterized in that including：
Detect the electric current at least one load motor；
Judge whether the electric current of the load motor meets preset failure protective condition；
In the case where the electric current of the load motor meets the preset failure protective condition, in preset time described in disconnection
Electric current on load motor；
Wherein, when the preset time is less than the action of the service entrance switch between at least one load motor and power supply
Between.
8. the method according to the description of claim 7 is characterized in that the electric current in the load motor meets the preset failure
In the case of protective condition, the electric current on the load motor is disconnected in preset time, including：
In the case where the electric current of the load motor meets the preset failure protective condition, existed by control circuit protector
The electric current on the load motor is disconnected in preset time, including：
Obtain the actuation time of the execution protection act of the circuit brake under the preset failure protective condition；
It detects the load motor and meets whether fault time of the preset failure protective condition reaches the preset failure and protect
The actuation time of the execution protection act of the circuit brake under the conditions of shield；
The fault time for meeting the preset failure protective condition in the load motor reaches the preset failure protective condition
Under the circuit brake execution protection act actuation time in the case of, control the circuit brake disconnect it is described negative
Carry the electric current on motor.
9. the method according to the description of claim 7 is characterized in that the preset failure protective condition include it is following at least it
One：Overcurrent fault protective condition, undercurrent failsafe condition, open-phase fault protective condition, anti-phase failsafe condition, stall
Failsafe condition, stall failsafe condition, current imbalance failsafe condition, short trouble protective condition；Wherein, exist
In the case that the electric current of the load motor meets the preset failure protective condition, the load electricity is disconnected in preset time
Electric current on machine includes one of arbitrary as follows：
In the case where the electric current of the load motor meets the overcurrent fault protective condition, break in the first preset time
Open the electric current on the load motor；
In the case where the electric current of the load motor meets the undercurrent failsafe condition, disconnected in the second preset time
Electric current on the load motor；
In the case where the electric current of the load motor meets the anti-phase failsafe condition, disconnected in third preset time
Electric current on the load motor；
In the case where the electric current of the load motor meets the stall failsafe condition, disconnected in the 4th preset time
Electric current on the load motor；
In the case where the electric current of the load motor meets the stall failsafe condition, disconnected in the 5th preset time
Electric current on the load motor；
In the case where the electric current of the load motor meets the current imbalance failsafe condition, in the 6th preset time
The interior electric current disconnected on the load motor；
In the case where the electric current of the load motor meets the short trouble protective condition, disconnected in the 7th preset time
Electric current on the load motor.
10. the method according to the description of claim 7 is characterized in that the method further includes：
Monitor the motor operation information of at least one load motor, wherein the motor operation information include it is following at least
One of：Current information, information of voltage and frequency information；
In the case of the motor operation Information abnormity, the fault message of the load motor is recorded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810558369.2A CN108649535A (en) | 2018-06-01 | 2018-06-01 | motor protection method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810558369.2A CN108649535A (en) | 2018-06-01 | 2018-06-01 | motor protection method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108649535A true CN108649535A (en) | 2018-10-12 |
Family
ID=63759312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810558369.2A Pending CN108649535A (en) | 2018-06-01 | 2018-06-01 | motor protection method and system |
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| Country | Link |
|---|---|
| CN (1) | CN108649535A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109733368A (en) * | 2019-01-18 | 2019-05-10 | 江苏大学 | A kind of line control brake system and its control method of anti-failure |
| CN116914895A (en) * | 2023-09-12 | 2023-10-20 | 浙江格瑶科技股份有限公司 | Power supply device of motor protector and power supply method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103532098A (en) * | 2013-10-12 | 2014-01-22 | 南京欧格节能科技有限公司 | Electromotor integrative protector |
| CN205544217U (en) * | 2016-01-14 | 2016-08-31 | 山东科技大学 | Intelligence motor protection |
| CN106571618A (en) * | 2016-08-31 | 2017-04-19 | 鲁西工业装备有限公司 | High-sensitivity low-voltage motor automatic protection device and method |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532098A (en) * | 2013-10-12 | 2014-01-22 | 南京欧格节能科技有限公司 | Electromotor integrative protector |
| CN205544217U (en) * | 2016-01-14 | 2016-08-31 | 山东科技大学 | Intelligence motor protection |
| CN106571618A (en) * | 2016-08-31 | 2017-04-19 | 鲁西工业装备有限公司 | High-sensitivity low-voltage motor automatic protection device and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109733368A (en) * | 2019-01-18 | 2019-05-10 | 江苏大学 | A kind of line control brake system and its control method of anti-failure |
| CN109733368B (en) * | 2019-01-18 | 2021-05-25 | 江苏大学 | Failure-preventing brake-by-wire system and control method thereof |
| CN116914895A (en) * | 2023-09-12 | 2023-10-20 | 浙江格瑶科技股份有限公司 | Power supply device of motor protector and power supply method thereof |
| CN116914895B (en) * | 2023-09-12 | 2023-12-15 | 浙江格瑶科技股份有限公司 | Power supply device of motor protector and power supply method thereof |
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Application publication date: 20181012 |