CN102842887A - Anti-interference electricity protection method and anti-interference electricity protection device for electric equipment - Google Patents
Anti-interference electricity protection method and anti-interference electricity protection device for electric equipment Download PDFInfo
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Abstract
The invention relates to an anti-interference protection method for a motor or electric equipment in an interference state of a power grid and an anti-interference protection device thereof. The invention adopts the overcurrent lockout voltage loss judgment, voltage loss overtime lockout judgment and voltage recovery judgment in the technical scheme of power grid voltage interference identification, can effectively distinguish different types of faults or accident events such as power grid faults and motor short-circuit accidents, power grid voltage interference faults and power grid power loss accidents, avoids the occurrence of the fault events of the protection device in the motor short-circuit accidents and the power grid power loss accidents, and ensures the safety of equipment and personnel.
Description
Technical field
The present invention relates to field of power electronics, relate in particular under a kind of electrical network rolling electricity condition power consumption equipment anti-rolling electric protection method and anti-rolling electrical protective devices thereof such as motor.
Background technology
Rolling electricity is meant the electrical network momentary fluctuation that line voltage causes because of reasons such as a certain circuit electric short circuit accident or electric operation in thunderbolt, the electrical network and even the electric fault phenomenon of instantaneous loss of pressure.
Because the rolling electric process is moment; And the just voltage that influenced by it; So most electric equipments can be because of rolling electric fault itself cause damaging, but the moment reduction of line voltage can cause relying on the instantaneous reduction of ac contactor coil supply voltage that line voltage is supplied power.Generally speaking, the rolling electric fault time, the A.C. contactor iron core can be because of the reduction would trip of ac contactor coil voltage as long as be lower than 70% load voltage value greater than 60 milliseconds, magnitude of voltage, and the main contacts of A.C. contactor is separating brake immediately.A.C. contactor is the crucial electric component of far distance controlled, interlocked control, and its main contacts is being controlled the power supply of power consumption equipments such as motor, and the separating brake of A.C. contactor main contacts can make power consumption equipments such as motor out of service because of losing power supply.What deserves to be mentioned is, be can automatic closing behind the common A.C. contactor main contacts separating brake of power supply out of hand, needs to rely on manual reversion and close a floodgate.Therefore, after rolling electricity finishes, power consumption equipments such as motor will be in state out of service in the long period section, require the aspects such as safety in production, product quality than higher enterprises and institutions to bring direct and indirect economic loss to power supply reliability.
For avoiding shaking the economic loss that electric fault brings to enterprises and institutions, each electrical control research institution, electric controling element manufacturer have done a large amount of research to rolling electric fault physical characteristic, control element characteristic.Representative anti-rolling power technology has two kinds of methods at present: one of which, development have the A.C. contactor of anti-rolling electrical characteristics, two, provide UPS uninterruptedly to control power supply to ac contactor coil.
Chinese invention patent application " anti-flashover intelligent AC contactor " (application number CN200810072005, publication number CN101393819) discloses the electric A.C. contactor of a kind of anti-rolling, comprises the power rectifier circuit; Sample circuit, testing circuit, high-power switch tube; Optical coupling isolator, accumulator, reverse exciting topological circuit; High frequency transformer, SCM system, communication module; The power supply of LMDS Light Coupled Device and contactor body utilize the high pressure start loop to accomplish and start, and utilize the decompression that is connected to accumulator to keep the loop to accomplish contactor coil and keep adhesive at the rolling electricity condition.Though the electric A.C. contactor of anti-rolling of this invention has the function of self-sustaining when the rolling electrification takes place, normal disjunction when not shaking electrification; But; Because accumulator can prolong the operate time of tripping; When power consumption equipments such as the motor accident that self is short-circuited, when needing the A.C. contactor fast trip, tend to keep the existence in loop in time to move because of accumulator and decompression.Provide the method for UPS uninterrupted power supply equally also to comprise accumulator to ac contactor coil, also can increase the reaction time of control system.The power consumption equipment quantity such as motor of the 110KV grade electrical network management and control of a large and medium-sized enterprise are up to thousands of and even up to ten thousand; The huge short circuit current that short trouble produces not only can itself cause fatal infringement to power consumption equipments such as motors, also can have a strong impact on to electrical network and power supply unit generation.When a certain loop is short-circuited accident in the electrical network; If have accumulator the electric A.C. contactor of anti-rolling can not fast trip; The whole line voltage moment reduction that causes; Short trouble is further expanded as electrical network rolling electric fault, causes power consumption equipments such as motor numerous in same electrical network collective's " strike " simultaneously, brings to enterprise production to seriously influence.
In addition, the electric A.C. contactor circuit structure of anti-rolling is complicated, and reliable in action property is relatively low, maintenance difficult; The UPS uninterrupted power supply is concentrated and is provided; And the motor even load is dispersed in everywhere; Need to increase the circuit that is connected between a large amount of UPS uninterrupted power supplys and the numerous A.C. contactor; UPS uninterrupted power supply and the connection line newly established have not only improved the project investment cost, and the probability of malfunction of control circuit is relatively large.
Summary of the invention
The objective of the invention is to provide the anti-rolling of a kind of power consumption equipment electric protection method; Solve prior art and adopt anti-rolling electric contactor and provide the anti-rolling method for electrically of UPS uninterrupted power supply can not correctly discern the low-voltage reason, the technical problem that can not fast trip causes fault to enlarge to ac contactor coil.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of program control that uses a computer realizes the anti-rolling of power consumption equipment electric protection method, comprises following steps:
A) be used to import setup parameter and store setup parameter the step of storage device into, described setup parameter comprises that at least overcurrent set point and rolling electricity allow the time set value;
B) be used to the to sample step of input, this step is imported line voltage and load current real-time sampling, and stores sampled value into storage device;
C) be used for comparison sampled value and setup parameter, judge the step of identification electrical network rolling electric fault;
D) be used for the step that anti-rolling electricity is restarted output, this step is sent the rolling electricity through output port and is recovered to restart signal, and the control power consumption equipment resumes operation;
E) be used to withdraw from the step that resists rolling electric protection state,
The step c of described judgement identification electrical network rolling electric fault is the overtime judgement flow process of overcurrent locking decompression, this flow process comprise as
Following step:
C1) be used to judge the step of decompression state, this step comparative voltage sampled value and low voltage set value are if the voltage sample value is less than the low voltage set value; Then be judged to be the decompression state; Forward overcurrent locking comparison step c2 to, otherwise, forward the step c4 that judges that voltage recovers to;
C2) be used to judge the step of overcurrent locking, this step is current sampling data and overcurrent set point relatively, if current sampling data greater than the overcurrent set point, then is judged to be the overcurrent blocking, forwards step e to and withdraw from anti-rolling electric protection state, otherwise, entering step c3;
C3) be used to start the step of decompression timer;
C4) be used to judge the step that voltage recovers, this step comparative voltage sampled value and recovery voltage set point if the voltage sample value greater than the recovery voltage set point, then is judged to be voltage and returns to form, get into step c5, otherwise, return the input step b that samples;
C5) be used to the step of judging that decompression is overtime, this step relatively the decompression time allow the time set value with the rolling electricity, if the decompression time allows the time set value greater than the rolling electricity; Then be judged to be the decompression timeout mode; Forward step e to and withdraw from anti-rolling electric protection state, otherwise, be judged to be the rolling electric fault; Forward steps d to, carry out the electric restart operation of anti-rolling.
The program control that uses a computer of the present invention realizes that the preferable technical scheme of the anti-rolling of power consumption equipment electric protection method is after described sampling input step b, also to comprise the step b1 that is used for the protective device charging, and this step comprises following action:
Comparative voltage sampled value and recovery voltage set point, judging has press strip spare;
Compare current sampling data and the stream set point is arranged, judging has the stream condition;
Press strip spare is arranged and the stream condition is arranged if satisfy simultaneously, start the charging timer, carry out the charging interval timing;
Relatively charging interval and set point stabilization time,, then get into protective device charging completion status, forward the step c that judges identification electrical network rolling electric fault to if the charging interval reaches set point stabilization time, otherwise, return the input step b that samples,
The described step e that withdraws from anti-rolling electric protection state is the protective device discharge step, and this step comprises following action:
Stop and removing the charging timer;
Withdraw from protective device charging completion status.
The program control that uses a computer of the present invention realizes that the better technical scheme of the anti-rolling of power consumption equipment electric protection method is:
The sampled value of described sampling input step b comprises three-phase voltage sampled value and three-phase current sampled value at least;
The step c1 of described judgement decompression state comprises the action of the comparative result of three-phase voltage sampled value and low voltage set value being carried out AND operation;
The comparative result that the step c2 of described judgement overcurrent locking comprises three-phase current sampled value and overcurrent set point carries out the action of negative OR operation;
The step c4 that described judgement voltage recovers comprises the action of the comparative result of three-phase voltage sampled value and recovery voltage set point being carried out inclusive-OR operation.
The program control that uses a computer of the present invention realizes that the further improved technical scheme of the anti-rolling of power consumption equipment electric protection method is: the setup parameter described in the step a also comprises the start-up time delay set point, described be used for steps d that anti-rolling electricity restarts output also comprise start delayer and according to the start-up time delay set point time-delay send the rolling electricity and recover the action of restarting signal.
Another object of the present invention is that a kind of anti-rolling electrical protective device of implementing said method will be provided, and the circuit structure of the electric A.C. contactor of anti-rolling of solution prior art is complicated, cost is high, reliability is lower, the technical problem of maintenance difficult.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of anti-rolling electrical protective device of implementing above-mentioned anti-rolling electric protection method; Form by Microcomputer Protection device, voltage transmitter, current transformer, A.C. contactor, start button, stop button, control switch; Described Microcomputer Protection device comprises current signal processing module, voltage signal processing module, power module, CPU, control module and man-machine interaction unit; Voltage transmitter is connected to the line voltage input; The main contacts of current transformer and A.C. contactor is connected in series in the load current loop; The output of voltage transmitter connects CPU through the voltage signal processing module; The output of current transformer is connected to CPU through current signal processing module, and control module is connected to the control loop that the auxiliary contact of control switch, start button, stop button, A.C. contactor are connected with coil, it is characterized in that described CPU comprises following functional module at least:
Be used to carry out the microprocessor of the control program that resists the rolling electric protection method;
Be used to store the program storage device of the control program of described anti-rolling electric protection method;
The analog-to-digital conversion module that is used for voltage and current sampling input;
The register or the data storage device that are used for storage voltage and current sampling data;
Be used to store data storage device through the setup parameter of man-machine interface unit input;
The comparator software function module that is used for comparison sampled value and setup parameter;
Be used to discern the rolling electricity condition decision logic functional module of electrical network rolling electric fault.
A kind of anti-rolling electrical protective device that is applicable to the above-mentioned anti-rolling electric protection method of enforcement of three phase network, last comparator software function module comprises:
Three comparators that are used for comparison three-phase voltage sampled value and low voltage set value, judge the decompression state;
Three comparators that are used for comparison three-phase current sampled value and overcurrent set point, judge over-current state;
Three are used for comparison three-phase voltage sampled value and recovery voltage set point, judge the comparator that voltage recovers.
A kind of preferable technical scheme of the anti-rolling electrical protective device of the above-mentioned anti-rolling electric protection method of enforcement of the present invention is:
Described rolling electricity condition decision logic functional module comprises overcurrent locking decompression judge module, the overtime judge module of decompression and overtime blocking voltage and recovers judge module;
Described overcurrent locking decompression judge module is judged by decompression and door, overcurrent judgement NOR gate and overcurrent locking are formed with door; Judge that the output of the comparator of decompression state is connected to the input of decompression judgement and door for three; The outputs of the comparator of three judgement over-current states are connected to the input of overcurrent judgement NOR gate, and decompression judges that the output with door and overcurrent judgement NOR gate is connected to the input of overcurrent locking and door;
The overtime judge module of described decompression is a logic judgment module that comprises timer; The overcurrent locking is connected to timer with the output of door; Start timer and carry out the decompression timing, if the clocking value of timer allows the time set value less than the rolling electricity, the overtime judge module output of decompression high level; Otherwise, output low level;
Described overtime blocking voltage recover that judge module is recovered to judge by voltage or door and overtime locking with form; The outputs of the comparator of three judgement voltage recovery are connected to the input that voltage recovers judgement or door, and the output of voltage recovery judgement or door and the output of the overtime judge module of decompression are connected to the input of overtime locking and door;
Described rolling electricity condition decision logic functional module is connected to described control module through the output of overtime locking and door, sends the rolling electricity through control module and recovers to restart signal.
The better technical scheme of the anti-rolling electrical protective device of the above-mentioned anti-rolling electric protection method of enforcement of the present invention is: described anti-rolling electrical protective device also comprises the delayer functional module; The output of described rolling electricity condition decision logic functional module is connected to the delayer functional module; Start delayer according to the time-delay of start-up time delay set point, send the rolling electricity through described control module time-delay and recover to restart signal.
A kind of better technical scheme of the anti-rolling electrical protective device of the above-mentioned anti-rolling electric protection method of enforcement of the present invention is: described anti-rolling electrical protective device also comprises protective device and discharges and recharges functional module; Described protective device discharges and recharges functional module by being judged with door by pressure, being made up of with door and charging timer stream judgement and door, charge initiation; Have press to judge with door with have stream to judge that output with door is connected to the input of charge initiation and door; The charging time-delay is connected to startup charging timer with the output of door; Press strip spare is arranged and the stream condition is arranged if satisfy simultaneously, the timing of charging timer initiation is set point when if the clocking value of charging timer surpasses chargometer; Charging timer output high level gets into protective device charging completion status.
The charging timer that above-mentioned protective device discharges and recharges functional module is provided with the discharge reduction input; This discharge reduction input through or door be connected to rolling electricity condition decision logic functional module; If described rolling electricity condition decision logic functional module detects overcurrent blocking or decompression timeout mode; Perhaps send the rolling electricity and recover to restart after the signal, the discharge reduction input is changed to high level, and the protective device discharge is also withdrawed from protective device charging completion status.
The invention has the beneficial effects as follows:
The judgement of overcurrent locking decompression, the overtime locking judgement of decompression and voltage that the present invention adopts in electrical network shakes electric recognition technology scheme recover to judge; Can distinguish heterogeneitys such as electric network fault and motor short circuit accident, electrical network rolling electric fault and electrical breakdown accident, dissimilar fault or accident event effectively; Avoided protective device to take place, ensured equipment and personal safety at motor short circuit accident and electrical breakdown accident misoperation incident;
The present invention adopts through man-machine interface input and storage setup parameter in the Control Software structural design; Can realize neatly setting basic detections and Control Parameter such as overcurrent set point, rolling electricity permission time set value and start-up time delay set point, improve the reliability and the control precision of anti-rolling electric protection by part throttle characteristics, network characteristic;
The protective device that the present invention adopted discharges and recharges scheme, not only can avoid effectively causing motor to start suddenly because of protective device misoperation or the long-term dead electricity of electrical network, has ensured equipment and personal safety; But also ensured that the rolling electric installation moves once following of electrical network rolling electricity condition, avoid short time internal cause system repeatedly to shake electricity and cause motor to start repeatedly and stop.
The rolling of the being adopted electricity that the present invention adopted recovers the delayed startup scheme, can be according to power consumption equipment character configuration different time delay set point start-up time, and when realizing electrical network rolling electricity, the branch batch initiation of motor and power consumption equipment makes electrical network avoid heavy current impact;
The present invention adopt with door with or gate logic arbitration functions module accomplish rolling electricity condition decision logic, can ground avoid the malfunction or the tripping of protective device, ensured the reliability that protective device moves;
The inventive method adopts computer program control to realize identification of rolling electricity and defencive function; The circuit structure that has not only solved the electric A.C. contactor of existing anti-rolling is complicated, cost is high, reliability is lower, the problem of maintenance difficult, and possess that defencive function is powerful flexibly, management is provided with conveniently, sample rate is fast, the sampling good stability, control precision is high and anti-interference characteristics such as strong.
Description of drawings
Fig. 1 program control that uses a computer realizes the software flow pattern of the anti-rolling of power consumption equipment electric protection method;
The Microcomputer Protection device hardware block diagram of the anti-rolling of Fig. 2 electrical protective device;
Fig. 3 shakes the logic diagram of electricity condition decision logic functional module;
The hardware configuration and the winding diagram of the anti-rolling of Fig. 4 electrical protective device;
Fig. 5 protective device discharges and recharges the logic diagram of functional module.
Embodiment
In order to understand technique scheme of the present invention better, describe in detail further below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the software flow pattern that the program control that uses a computer of the present invention realizes first embodiment of the anti-rolling of power consumption equipment electric protection method; The flow chart of present embodiment has only comprised the basic step that realizes the anti-rolling of power consumption equipment electric protection method, does not comprise the required well-known routines steps of process such as microsystem computer software and hardware power-up initializing that those skilled in the art are familiar with.The basic step of the anti-rolling of realization power consumption equipment provided by the invention electric protection method comprises:
Step a is used to import setup parameter and setup parameter is stored into the step of storage device:
Realize that the related parameter of power consumption equipment anti-rolling electric protection comprises the low voltage set value that is used to judge decompression; Be used to judge the overcurrent set point of overcurrent; Be used to judge the recovery voltage set point that powers on the voltage recovery; What be used for judgment means charging has a stream set point, set point when being used to judge the stable chargometer of charging, and the rolling electricity that is used for the overtime judgement of decompression allows the time set value, is used for the setup parameters such as start-up time delay set point of delayed startup control.In the present embodiment; The 70%=154V of low voltage set value power taking source phase voltage; The 90%=198V of recovery voltage set point power taking source phase voltage; The fixedly fixing value 10S of set point when value 1000mA, chargometer of stream set point is arranged, be handled easily, these preset parameters are provided with in advance and are stored in the memory.Overcurrent set point d1, rolling electricity allow time set value d2 and start-up time delay set point d3 load set as required; Can be through input key groups 1073 inputs of Microcomputer Protection device; And be stored in the eprom memory 1053 of central signal processing unit 105, referring to Fig. 2.
Step b, the step of the input that is used to sample, this step is imported line voltage and load current real-time sampling, and stores sampled value into storage device:
Three-phase voltage U a, Ub, Uc become the DC simulation signal after voltage transmitter 200 conversions; Send CPU 105 to through current signal processing module 102; Three-phase current Ia, Ib, Ic become mA level current signal after current transformer 300 conversions; Send CPU 105 to through voltage signal processing module 103, the analog to digital converter 1051 by CPU 105 converts voltage sample value and current sampling data into again, stores in the register of sampling channel; In the present embodiment, voltage sample value and current sampling data comprise three-phase voltage sampled value and three-phase current sampled value.
Step c is used for comparison sampled value and setup parameter, judges the step of identification electrical network rolling electric fault:
In the present embodiment; This step is called the overtime judgement flow process of overcurrent locking decompression; Its basic logic functions is as shown in Figure 3, comprises the step f that is used to judge the decompression state, is used to judge the step g of overcurrent locking; Be used to start the step h of decompression timer, be used to judge voltage step I of recovering and the step j that is used to judge that decompression is overtime.
Steps d is used for the step that anti-rolling electricity is restarted output, and this step is sent the rolling electricity through output port and recovered to restart signal, and the control power consumption equipment resumes operation:
In the present embodiment, this step comprise start delayer and according to the start-up time delay set point time-delay send the rolling electricity and recover the action of restarting signal.If step c judged result is an electrical network rolling electric fault, program control starts delayer and carries out timing, during timing to start-up time delay set point d3 value, sends triggering signal to control module 106, and the relay contact 1062 through control module sends.The purpose that delayed startup is set is to start simultaneously when the rolling electrification takes place for fear of motor and power consumption equipment, forms bigger impulse current.Through different time delay set point start-up time d3 numerical value is set, realize that motor and power consumption equipment divide batch initiation, after can slowing down the rolling electricity and finishing, motor and power consumption equipment startup are to the impact of electrical network.
The technical scheme of present embodiment also comprises the step of protective device charging, and the link of protective device charging is set, and is that its logic function is as shown in Figure 5 for fear of the misoperation of rolling electrical protective device.
Step k comprises following action:
Comparative voltage sampled value and recovery voltage set point, judging has press strip spare, in the present embodiment, have press strip spare be supply voltage to reach specified phase voltage 220V 90%, that is, and U＞198V;
Compare current sampling data and the stream set point is arranged, judging has the stream condition, and in the present embodiment, it is that load current will reach 1000mA, i.e. I＞1000mA that the stream condition is arranged;
Press strip spare is arranged and the stream condition is arranged if satisfy simultaneously, start the charging timer, carry out the charging interval timing;
Relatively the charging interval and stabilization time set point, in the present embodiment, stabilization time, set point was 10S; If the charging interval reaches set point stabilization time, that is, and t＞10S; Then get into protective device charging completion status; Forward the step c that judges identification electrical network rolling electric fault to, otherwise, sampling input step b returned.
Step e is used to withdraw from the step that resists rolling electric protection state:
The purpose that this step is set is to guarantee that anti-rolling electric protection method of the present invention returns to form after program is carried out end, and in the present embodiment, this step is the protective device discharge step, and this step comprises following action:
Stop and removing the charging timer;
Withdraw from protective device charging completion status.
Below combine Fig. 1 and Fig. 3 that the overtime judgement flow process of the described overcurrent locking of step c decompression is explained that further this flow process comprises the steps: again
Step c1 is used to judge the step of decompression state, this step comparative voltage sampled value and low voltage set value; In the present embodiment, the low voltage set value is 154V, and promptly Rule of judgment is U＜154; If the voltage sample value less than the low voltage set value, then is judged to be the decompression state, forward overcurrent locking comparison step c2 to; Otherwise, forward the step c4 that voltage recovers judgement to;
In the present embodiment, judge that the step c1 of decompression state comprises the action of the comparative result of three-phase voltage sampled value and low voltage set value being carried out AND operation, that is, the criterion of this step is that Ua, Ub, Uc are low-voltage less than 154V all;
This step detects low voltage signal; Unusual with regard to illustrative system; This might be that motor or power consumption equipment short circuit accident cause unusually, also might be electrical network in short-term or when long decompression cause, therefore; Need further to carry out the overcurrent locking and judge, avoid causing the protective device misoperation because of the low-voltage that short circuit causes through step c2.
Step c2 is used to judge the step of overcurrent locking, and this step is current sampling data and overcurrent set point d1 relatively; Be that Rule of judgment is I＞d1, if current sampling data greater than the overcurrent set point, then is judged to be the overcurrent blocking; Forward step e to and withdraw from anti-rolling electric protection state, otherwise, step c3 got into;
In the present embodiment, judge that the comparative result that the step c2 of overcurrent locking comprises three-phase current sampled value and overcurrent set point carries out the action of negative OR operation.
Step c3 is used to start the step of decompression timer;
Step c4 is used to judge the step that voltage recovers, this step comparative voltage sampled value and recovery voltage set point; In the present embodiment, the recovery voltage set point is 198V, and promptly Rule of judgment is U＞198; If the voltage sample value greater than the recovery voltage set point, then is judged to be voltage and returns to form, get into step c5 and judge that decompression is overtime; Otherwise, return sampling input step b;
In the present embodiment, judge that the step c4 that voltage recovers comprises the action of the comparative result of three-phase voltage sampled value and recovery voltage set point being carried out inclusive-OR operation.
Step c5 is used to the step of judging that decompression is overtime, and the rolling that stores in this step comparison decompression time and storage device electricity allows time set value d2; If the decompression time allows the time set value greater than the rolling electricity, then be judged to be the decompression timeout mode, the reason that low-voltage is described is not that electrical network rolling electricity causes; But the long-term dead electricity of electrical network, program forwards step e to and withdraws from anti-rolling electric protection state, otherwise; Be judged to be the rolling electric fault, forward steps d to, carry out the electric restart operation of anti-rolling.
Fig. 4 is the hardware configuration and the winding diagram of an embodiment of the anti-rolling electrical protective device of the above-mentioned anti-rolling electric protection method of enforcement of the present invention.The anti-rolling electrical protective device of present embodiment adopts integral structure; Form by Microcomputer Protection device 100, voltage transmitter 200, current transformer 300, A.C. contactor 400, start button 500, stop button 600, control switch 700; Described Microcomputer Protection device 100 comprises current signal processing module 102, voltage signal processing module 103, power module 104, CPU 105, control module 106 and man-machine interaction unit 107; Voltage transmitter 200 is connected to the line voltage input; Current transformer 300 is connected in series in the load current loop with the main contacts of A.C. contactor 400; The output of voltage transmitter 200 connects CPU 105 through voltage signal processing module 103; The output of current transformer 300 is connected to CPU 105 through current signal processing module 103, and control module 106 is connected to the control loop that the auxiliary contact 401 of control switch 700, start button 500, stop button 600, A.C. contactor 400 are connected with coil 402.
In the present embodiment, voltage transmitter 200 is used for voltage signal processing module 103 desired DC simulation signals are sent in the voltage isolation change of electrical network.Said current transformer 300 is three phase combined current transformer, is used for load current is transformed into current signal processing module 102 desired input current scopes.The main contact of A.C. contactor 400 is used to control motor primary circuit power connection or cut-out; Its secondary contact 401 is parallelly connected with start button 500; Retentive control ac contactor coil 402 is switched on after being used for electric motor starting, and ac contactor coil 402 is used to control the closed or disconnection of A.C. contactor main contact.Start button 500, stop button 600, control switch 700 models are used for anti-rolling controller for electric consumption control loop and switch on or off.
In the present embodiment, anti-rolling electrical protective device is connected to three-phase alternating-current supply through outside circuit breaker DL, and the external loading that is connected to anti-rolling electrical protective device is a motor.The external terminal mode of connection of anti-rolling electrical protective device is that the terminals T1 of protective device, T3, T5 connect following pile crown L1, L2, the L3 of circuit breaker DL respectively; The terminals T2 of protective device, T4, T6 connect inlet wire pile crown U, V, the W of motor respectively, and terminals N is connected with power supply N line.
The inside major loop mode of connection of the anti-rolling electrical protective device of present embodiment does; Terminals T1, T3, the T5 of three single-core cable difference jockeys; And be connected with A.C. contactor 400 main contact J1, J2, J3 respectively after passing current transformer 300 iron cores, A.C. contactor 400 main contact J4, J5, J6 are connected with terminals T2, T4, the T6 of device respectively.
The inner control loop mode of connection of the anti-rolling electrical protective device of present embodiment does, draws control line 1 by the terminals T5 of device, is connected to control switch 700 left side terminals; Control switch 700 right side terminals are drawn control line 3; Be connected to stop button 600 left side terminals, stop button 600 right side terminals are drawn control line 5, are connected to Microcomputer Protection device switching value terminals row 108 output common terminal OCOM; Microcomputer Protection device switching value outlet terminal row 108 terminals O1 draws control line 7; Be connected to start button 500 right side terminals, start button 500 left side terminals are drawn control line 9, are connected to ac contactor coil 402 left side terminals; Ac contactor coil 402 right side terminals are drawn control line 2, are connected to the terminals N of protective device.
The internal measurement circuit connection method of the anti-rolling electrical protective device of present embodiment does; Terminals T1, T3, T5 by protective device draw control line 11,12,13 respectively; Be connected to voltage transmitter 200 input terminal Ua, Ub, Uc; Draw control line 21,22,23 respectively by voltage transmitter 200 outlet terminal A, B, C, be connected to terminals Ua, Ub, Uc that the Microcomputer Protection device detects terminals row 101.Three phase combined current transformer 300 secondary line Ia, Ib, Ic, directly Ia, Ib, the Ic terminals with Microcomputer Protection device detection terminals row 101 are connected.
The control loop of the electric motor starting operation of the anti-rolling electrical protective device of present embodiment is:
Power line L3-control switch 700-stop button 600-electrical equipment normally-closed contact 1061-start button 500-ac contactor coil 402-power line N
The control loop of running status is after the startup of the anti-rolling electrical protective device of present embodiment:
Power line L3-control switch 700-stop button 600-relay normally-closed contact 1061-auxiliary contact 401-coil 402-power line N
During the motor shut-down operation, press stop button 600, ac contactor coil 402 dead electricity, its auxiliary contact 401 breaks off, stop button 600 is resetted after, kept the open circuit of ac contactor coil 402.
Characteristic during electrical network rolling electricity is a power supply elder generation decompression, and voltage instantaneous recovers normal thereafter.When line voltage does not have pressure; Ac contactor coil 402 is because of the outage of electrical network decompression; After Microcomputer Protection device 100 detects electrical network rolling electricity in the device, its output relay action, then the contact 1061 of output relay changes disconnection, contact 1062 into by closure and changes closure into by disconnection; When the rolling electric fault took place electrical network, the control loop of the anti-rolling electrical protective device of present embodiment was:
Power line L3-control switch 700-stop button 600-relay normally open contact 1062-coil 402-power line N
In the present embodiment; Current signal processing module 102 is rectification amplification filtering circuit, and its effect is that the digital to analog converter 1051 that the current analog amount signal rectification that is collected by current transformer 300 becomes direct current signal to send in the central signal processing unit 105 is carried out the AD conversion.Synchronized sampling pattern, the voltage and current value of promptly gathering same passage are simultaneously adopted in the AD conversion; Simultaneously, in the sampling channel configuration register, three electric current and voltage passages are arranged in order, make under a timer triggers the conversion of disposable all passages of completion.Voltage signal processing module 103 is a pressure filter circuit; Its effect is with the voltage analog signal that is collected by voltage transmitter 200; Convert the digital to analog converter of sending in the central signal processing unit 105 behind the direct current signal 1051 to and carry out the AD conversion Calculation, all analog-to-digital conversion all adopt the timer internal down trigger.Power module 104 is an ac-dc converter circuit, its effect be with the input the 220V power source conversion be stable 5V DC power supply, as central signal processing unit 105 DC power supplys.Said central signal processing unit 105 is Microcomputer Protection device 100 core modules, is made up of 12 high precision digital-to-analog converters 1051, high-performance microprocessor 1052, mass storage 1053.Control module 106 is an output relay, and output relay has 2 auxiliary contacts, A.C. contactor 400 control loops when wherein a secondary normally opened contact 1062 is used to connect electrical network rolling electricity.The major function of man-machine interaction unit 107 is to realize that the transmitter is to the order of device and the various information in the display unit; The combination that is equivalent to computor-keyboard and display; Pass through man-machine interaction unit; Can be easily according to different protection object and requirement, input or revision overcurrent set point d1, rolling electricity allow set points such as time set value d2 and start-up time delay set point d3, check various protection information and device maintenance information.Man-machine interaction unit 107 is made up of light-emitting diode display 1071, status indicator lamp group 1072, input key groups 1073.Light-emitting diode display 1071 is made up of 4 charactrons, is used to show setting value, quantity of state and measured value.Status indicator lamp group 1072 is made up of 2 indicator lights, provides power alarm and plant failure alarm signal respectively, indicator light constant just often, indicator light flicker during fault.Key groups 1073 is made up of 5 touch-keys, is respectively applied for, and involution behind the device action, menu show, parameter setting increases progressively, parameter setting successively decreases, parameter setting is confirmed.
In the present embodiment, CPU 105 also comprises following functional module:
Be used to carry out the microprocessor 1052 of the control program that resists the rolling electric protection method;
Be used to store the program storage device 1053 of the control program of described anti-rolling electric protection method;
The analog-to-digital conversion module 1051 that is used for voltage and current sampling input;
The register or the data storage device that are used for storage voltage and current sampling data, this register or data storage device can be the integrated memory function unit of microprocessor internal, also can be EPROM memory cell 1053;
Be used to store data storage device 1053 through the setup parameter of man-machine interface unit input;
The comparator software function module that is used for comparison sampled value and setup parameter;
Be used to discern the rolling electricity condition decision logic functional module of electrical network rolling electric fault.
Above-mentioned comparator software function module comprises: three comparators that are used for comparison three-phase voltage sampled value and low voltage set value, judge the decompression state; Three comparators that are used for comparison three-phase current sampled value and overcurrent set point, judge over-current state; Three are used for comparison three-phase voltage sampled value and recovery voltage set point, judge the comparator that voltage recovers.
Above-mentioned rolling electricity condition decision logic functional module comprises overcurrent locking decompression judge module L01, the overtime judge module L01 of decompression and overtime blocking voltage and recovers judge module L03, referring to Fig. 3.The purpose that rolling electricity condition decision logic functional module is set be used for discerning low-voltage be line voltage rock cause or cause because of over current of motor; Rock and cause then start anti-rolling electric protection function if low-voltage is an electrical network; Otherwise then locking resists rolling electric protection function.
Overcurrent locking decompression judge module L01 is judged by decompression and a door L011, overcurrent judge that NOR gate L012 and overcurrent locking and door L013 form; Judge that the output of the comparator of decompression state is connected to the input of decompression judgement and door L011 for three; Judge that the outputs of the comparator of over-current state are connected to the input of overcurrent judgement NOR gate L012 for three, the decompression judgement judges that with door L011 and overcurrent the output of NOR gate L012 is connected to the input of an overcurrent locking and a L013.
The overtime judge module L02 of decompression is a logic judgment module that comprises timer Lbd; The overcurrent locking is connected to timer Lbd with the output of door L013; Start timer Lbd and carry out the decompression timing, if the clocking value of timer Lbd allows time set value d2 less than the rolling electricity, the overtime judge module L02 output of decompression high level; Otherwise, output low level.
Described overtime blocking voltage recovery judge module L03 recovers judgement or door L031 and overtime locking by voltage and forms with a L032; The outputs of the comparator of three judgement voltage recovery are connected to the input that voltage recovers judgement or door L031, and the output of voltage recovery judgement or door L031 and the output of the overtime judge module L02 of decompression are connected to the input of overtime locking and door L032; The purpose that voltage recovers judge module L03 employing or door is for fear of because of certain phase secondary line broken string, installs tripping, improves the reliability that resists the rolling electric installation.
Rolling electricity condition decision logic functional module is through the output output electrical network rolling signal of telecommunication of overtime locking with door L032, and rolling electricity condition decision logic functional module can be directly connected to control module 106, sends the rolling electricity through control module 106 and recovers to restart signal.
The anti-rolling electrical protective device of present embodiment also comprises the software function module delayer; In the present embodiment; The output of rolling electricity condition decision logic functional module is connected to the delayer functional module; Start delayer according to start-up time delay set point d3 time-delay by program control, send the rolling electricity through described control module 106 time-delays and recover to restart signal.
The anti-rolling electrical protective device of present embodiment also comprises protective device and discharges and recharges functional module; Described protective device discharges and recharges functional module by being judged with a door L11 by pressure, forming with a door L12, charge initiation and door L13 and the timer Lcd that charges by flowing judgement, referring to Fig. 5, has pressure to judge with door L11 and have and flows the input that the output of judging with door L12 is connected to a charge initiation and a L13; The charging time-delay is connected to startup charging timer Lcd with the output of door L13; Press strip spare is arranged and the stream condition is arranged if satisfy simultaneously, be i.e. U＞198V, I＞1000mA; Charging timer Lcd starts timing; Set point 10S when if the clocking value of charging timer Lcd surpasses chargometer, charging timer Lcd output high level gets into protective device charging completion status.
The charging timer Lcd that above-mentioned protective device discharges and recharges functional module is provided with the discharge reduction input; This discharge reduction input through or door be connected to rolling electricity condition decision logic functional module; If described rolling electricity condition decision logic functional module detects overcurrent blocking or decompression timeout mode; Perhaps send the rolling electricity and recover to restart after the signal, the discharge reduction input is changed to high level, and the protective device discharge is also withdrawed from protective device charging completion status.
Microcomputer Protection device charging link is set, and is for fear of the misoperation of rolling electric installation, this be because; Before the circuit breaker DL that closes, device satisfies does not have pressure, no stream condition, and L013 is output as 1 with door; Close behind the circuit breaker DL, device is incoming call suddenly, and L031 or door are output as 1; The rolling electric installation will move, thereby can cause motor unplanned startup after the delayer time-delay, jeopardizes personal security.After being provided with the charging link, because before the circuit breaker DL that closes, device does not have stream, i.e. I＜1000mA; Device can not charge, even the satisfied nothing of device this moment is pressed so, no stream condition, device can not move yet, only behind the circuit breaker DL that closes; Satisfy the press strip spare that has of charging, behind the electric motor starting button 500 that closes then, that satisfies charging has a stream condition, again after delaying time in 10 seconds; Satisfy the stable operation condition of charging, device just can be accomplished charging, thereby prepares for the operation of rolling electric installation.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining technical scheme of the present invention; And be not to be used as qualification of the present invention; Any based on connotation of the present invention to variation, modification that the above embodiment did, all will drop in the protection range of claim of the present invention.
Claims (10)
1. the program control that uses a computer realizes the anti-rolling of power consumption equipment electric protection method, comprises following steps:
A) be used to import setup parameter and store setup parameter the step of storage device into, described setup parameter comprises that at least overcurrent set point and rolling electricity allow the time set value;
B) be used to the to sample step of input, this step is imported line voltage and load current real-time sampling, and stores sampled value into storage device;
C) be used for comparison sampled value and setup parameter, judge the step of identification electrical network rolling electric fault;
D) be used for the step that anti-rolling electricity is restarted output, this step is sent the rolling electricity through output port and is recovered to restart signal, and the control power consumption equipment resumes operation;
E) be used to withdraw from the step that resists rolling electric protection state,
It is characterized in that:
The step c of described judgement identification electrical network rolling electric fault is the overtime judgement flow process of overcurrent locking decompression, and this flow process comprises the steps:
C1) be used to judge the step of decompression state, this step comparative voltage sampled value and low voltage set value are if the voltage sample value is less than the low voltage set value; Then be judged to be the decompression state; Forward overcurrent locking comparison step c2 to, otherwise, forward the step c4 that judges that voltage recovers to;
C2) be used to judge the step of overcurrent locking, this step is current sampling data and overcurrent set point relatively, if current sampling data greater than the overcurrent set point, then is judged to be the overcurrent blocking, forwards step e to and withdraw from anti-rolling electric protection state, otherwise, entering step c3;
C3) be used to start the step of decompression timer;
C4) be used to judge the step that voltage recovers, this step comparative voltage sampled value and recovery voltage set point if the voltage sample value greater than the recovery voltage set point, then is judged to be voltage and returns to form, get into step c5, otherwise, return the input step b that samples;
C5) be used to the step of judging that decompression is overtime, this step relatively the decompression time allow the time set value with the rolling electricity, if the decompression time allows the time set value greater than the rolling electricity; Then be judged to be the decompression timeout mode; Forward step e to and withdraw from anti-rolling electric protection state, otherwise, be judged to be the rolling electric fault; Forward steps d to, carry out the electric restart operation of anti-rolling.
2. the program control that uses a computer according to claim 1 realizes the anti-rolling of power consumption equipment electric protection method, it is characterized in that:
Also comprise the step b1 that is used for the protective device charging after the described sampling input step b, this step comprises following action:
Comparative voltage sampled value and recovery voltage set point, judging has press strip spare;
Compare current sampling data and the stream set point is arranged, judging has the stream condition;
Press strip spare is arranged and the stream condition is arranged if satisfy simultaneously, start the charging timer, carry out the charging interval timing;
Relatively the charging interval and stabilization time set point; If the charging interval reaches set point stabilization time, then get into protective device charging completion status, forward the step c that judges identification electrical network rolling electric fault to; Otherwise; Return sampling input step b, the described step e that withdraws from anti-rolling electric protection state is the protective device discharge step, and this step comprises following action:
Stop and removing the charging timer;
Withdraw from protective device charging completion status.
3. the program control that uses a computer according to claim 1 realizes the anti-rolling of power consumption equipment electric protection method, it is characterized in that:
The sampled value of described sampling input step b comprises three-phase voltage sampled value and three-phase current sampled value at least;
The step c1 of described judgement decompression state comprises the action of the comparative result of three-phase voltage sampled value and low voltage set value being carried out AND operation;
The comparative result that the step c2 of described judgement overcurrent locking comprises three-phase current sampled value and overcurrent set point carries out the action of negative OR operation;
The step c4 that described judgement voltage recovers comprises the action of the comparative result of three-phase voltage sampled value and recovery voltage set point being carried out inclusive-OR operation.
4. realize the anti-rolling of power consumption equipment electric protection method according to claim 1, the 2 or 3 described program control that use a computer; It is characterized in that the setup parameter described in the step a also comprises the start-up time delay set point, described be used for steps d that anti-rolling electricity restarts output also comprise start delayer and according to the start-up time delay set point time-delay send the rolling electricity and recover the action of restarting signal.
5. anti-rolling electrical protective device of implementing the described anti-rolling electric protection method of claim 1; Form by Microcomputer Protection device, voltage transmitter, current transformer, A.C. contactor, start button, stop button, control switch; Described Microcomputer Protection device comprises current signal processing module, voltage signal processing module, power module, CPU, control module and man-machine interaction unit; Voltage transmitter is connected to the line voltage input; The main contacts of current transformer and A.C. contactor is connected in series in the load current loop; The output of voltage transmitter connects CPU through the voltage signal processing module; The output of current transformer is connected to CPU through current signal processing module, and control module is connected to the control loop that the auxiliary contact of control switch, start button, stop button, A.C. contactor are connected with coil, it is characterized in that described CPU comprises following functional module at least:
Be used to carry out the microprocessor of the control program that resists the rolling electric protection method;
Be used to store the program storage device of the control program of described anti-rolling electric protection method;
The analog-to-digital conversion module that is used for voltage and current sampling input;
The register or the data storage device that are used for storage voltage and current sampling data;
Be used to store data storage device through the setup parameter of man-machine interface unit input;
The comparator software function module that is used for comparison sampled value and setup parameter;
Be used to discern the rolling electricity condition decision logic functional module of electrical network rolling electric fault.
6. anti-rolling electrical protective device according to claim 5 is characterized in that described comparator software function module comprises:
Three comparators that are used for comparison three-phase voltage sampled value and low voltage set value, judge the decompression state;
Three comparators that are used for comparison three-phase current sampled value and overcurrent set point, judge over-current state;
Three are used for comparison three-phase voltage sampled value and recovery voltage set point, judge the comparator that voltage recovers.
7. anti-rolling electrical protective device according to claim 5 is characterized in that:
Described rolling electricity condition decision logic functional module comprises overcurrent locking decompression judge module, the overtime judge module of decompression and overtime blocking voltage and recovers judge module;
Described overcurrent locking decompression judge module is judged by decompression and door, overcurrent judgement NOR gate and overcurrent locking are formed with door; Judge that the output of the comparator of decompression state is connected to the input of decompression judgement and door for three; The outputs of the comparator of three judgement over-current states are connected to the input of overcurrent judgement NOR gate, and decompression judges that the output with door and overcurrent judgement NOR gate is connected to the input of overcurrent locking and door;
The overtime judge module of described decompression is a logic judgment module that comprises timer; The overcurrent locking is connected to timer with the output of door; Start timer and carry out the decompression timing, if the clocking value of timer allows the time set value less than the rolling electricity, the overtime judge module output of decompression high level; Otherwise, output low level;
Described overtime blocking voltage recover that judge module is recovered to judge by voltage or door and overtime locking with form; The outputs of the comparator of three judgement voltage recovery are connected to the input that voltage recovers judgement or door, and the output of voltage recovery judgement or door and the output of the overtime judge module of decompression are connected to the input of overtime locking and door;
Described rolling electricity condition decision logic functional module is connected to described control module through the output of overtime locking and door, sends the rolling electricity through control module and recovers to restart signal.
8. anti-rolling electrical protective device according to claim 5; It is characterized in that described anti-rolling electrical protective device also comprises the delayer functional module; The output of described rolling electricity condition decision logic functional module is connected to the delayer functional module; Start delayer according to the time-delay of start-up time delay set point, send the rolling electricity through described control module time-delay and recover to restart signal.
9. according to the described anti-rolling electrical protective device of arbitrary claim in the claim 5 to 8; It is characterized in that described anti-rolling electrical protective device also comprises protective device and discharges and recharges functional module; Described protective device discharges and recharges functional module by being judged with door by pressure, being made up of with door and charging timer stream judgement and door, charge initiation; Have press to judge with door with have stream to judge that output with door is connected to the input of charge initiation and door, the output of charging time-delay and door is connected to and starts the charging timer, press strip spare is arranged and the stream condition is arranged if satisfy simultaneously; The timing of charging timer initiation; Set point when if the clocking value of charging timer surpasses chargometer, charging timer output high level gets into protective device charging completion status.
10. anti-rolling electrical protective device according to claim 9; It is characterized in that the charging timer that described protective device discharges and recharges functional module is provided with the discharge reduction input; Described discharge reduction input through or door be connected to rolling electricity condition decision logic functional module; If described rolling electricity condition decision logic functional module detects overcurrent blocking or decompression timeout mode; Perhaps send the rolling electricity and recover to restart after the signal, the discharge reduction input is changed to high level, and the protective device discharge is also withdrawed from protective device charging completion status.
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