CN102842887B - 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, particularly relate to a kind of electrical network and to shake under electricity condition the anti-shake electric protection method of power consumption equipment and the anti-shake electrical protective devices thereof such as motor.
Background technology
The electricity that shakes refers to the electric fault phenomenon of line voltage because of thunderbolt, the reason such as a certain circuit electrical short circuit accident or electric operation causes in electrical network electrical network momentary fluctuation and even instantaneous loss of pressure.
Because rolling electric process is moment, and by the just voltage that it affects, therefore most electric equipment can not cause because shaking electric fault itself damaging, but the instantaneous reduction of ac contactor coil supply voltage that the moment reduction of line voltage can cause dependence line voltage to be powered.Generally, shake the electric fault time be only greater than 60 milliseconds, magnitude of voltage lower than 70% load voltage value, AC contactor iron core can because of the reduction of ac contactor coil voltage action tripping operation, the main contacts separating brake immediately of A.C. contactor.A.C. contactor is the critical electrical element of far distance controlled, interlocked control, and its main contacts controls the power supply of the power consumption equipments such as motor, the separating brake of A.C. contactor main contacts, and the power consumption equipments such as motor can be made out of service because losing power supply.It is worth mentioning that, can not automatic closing after the common A.C. contactor main contacts separating brake of power supply out of hand, manual reversion need be relied on and close a floodgate.Therefore, shake after electricity terminates, the power consumption equipments such as motor are in state out of service by long period section, require the aspect such as safety in production, product quality of higher enterprises and institutions to bring directly and indirectly economic loss to power supply reliability.
For the economic loss avoiding rolling electric fault to bring to enterprises and institutions, each electrical control research institution, electric controling element manufacturer have made large quantifier elimination to rolling electric fault physical characteristic, control element characteristic.Anti-shake power technology representative at present has two kinds of methods: one, development have the A.C. contactor of anti-shake 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) disclose a kind of survival network, comprise power rectifier circuit, sample circuit, testing circuit, high-power switch tube, optical coupling isolator, accumulator, reverse exciting topological circuit, high frequency transformer, Single Chip Microcomputer (SCM) system, communication module, the power supply of Light Coupled Device and contactor body, high pressure start loop is utilized to complete startup, utilize the decompression being connected to accumulator to keep loop to complete contactor coil and maintain adhesive at rolling electricity condition.Although the survival network of this invention have shake electrification occur time self-sustaining, do not occur shake electrification time normal disjunction function, but, because accumulator can extend the trip operation time, when the power consumption equipments such as motor self are short-circuited accident, when needing A.C. contactor fast trip, often because accumulator and decompression keep the existence in loop and cannot action in time.There is provided the method for UPS uninterrupted power supply to also contains accumulator equally to ac contactor coil, also can increase the reaction time of control system.The power consumption equipment quantity such as the motor of the 110KV level Grid 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 itself can cause fatal infringement to power consumption equipments such as motors, produces also can to electrical network and power supply unit and have a strong impact on.When certain primary Ioops in electrical network is short-circuited accident, if with accumulator survival network can not fast trip, the whole line voltage caused reduces instantaneously, short trouble expands as electrical network rolling electric fault further, cause the power consumption equipments such as motors numerous in same electrical network collective's " strike " simultaneously, produce to enterprise and bring serious impact.
In addition, survival network circuit structure is complicated, and Reliability of Microprocessor is relatively low, maintenance difficult; UPS uninterrupted power supply is concentrated and is provided, and motor even load is dispersed in everywhere, need to increase the circuit be connected between a large amount of UPS uninterrupted power supplys and numerous A.C. contactors, the UPS uninterrupted power supply newly established and connection line not only increase project investment cost, and the probability of malfunction of control circuit is relatively large.
Summary of the invention
The object of the invention is to provide a kind of power consumption equipment anti-shake electric protection method; solve prior art to adopt anti-shake electric contactor and provide the current interference prevention method of UPS uninterrupted power supply can not correctly identify low-voltage reason to ac contactor coil, the technical problem of failure propagation can not be caused by fast trip.
The present invention solves the problems of the technologies described above adopted technical scheme:
The anti-shake electric protection method of a kind of use computer program control realization power consumption equipment, comprises following steps:
A) for inputting setup parameter and setup parameter being stored into the step of storage device, described setup parameter at least comprises overcurrent set point and shakes electric permission time set point;
B) for the step of input of sampling, sampled value to line voltage and the input of load current real-time sampling, and is stored into storage device by this step;
C) for comparing sampled value and setup parameter, the step identifying electrical network rolling electric fault is judged;
D) restart the step of output for anti-shake electricity, this step sends rolling electricity by output port and recovers to restart signal, controls power consumption equipment and resumes operation;
E) for exiting the step of anti-shake electric protection state;
It is characterized in that:
Also comprise after described sampling input step b:
B1: for the protection of the step of device charging, this step comprises following action:
Comparative voltage sampled value and recovery voltage set point, judge there is press strip part;
Compare current sampling data and have stream set point, judging there is stream condition;
There is press strip part if meet simultaneously and have stream condition, starting charge timer, performing charging interval timing;
Relatively the charging interval and stabilization time set point, if the charging interval reaches set point stabilization time, then enter protective device charging complete state, forward to and judge to identify that electrical network shakes the step c of electric fault, otherwise, return sampling input step b;
The step c of described judgement identification electrical network rolling electric fault is that overcurrent locking decompression time-out judges flow process, and this flow process comprises the steps:
C1) for judging the step of decompression state, this step comparative voltage sampled value and low voltage set value, if voltage sample value is less than low voltage set value, then be judged to be decompression state, forward overcurrent locking comparison step c2 to, otherwise, forward the step c4 judging voltage resume to;
C2) for judging the step of overcurrent locking, this step compares current sampling data and overcurrent set point, if current sampling data is greater than overcurrent set point, is then judged to be overcurrent blocking, forwards step e to and exits anti-shake electric protection state, otherwise, enter step c3;
C3) for starting the step of decompression timer;
C4) for judging the step of voltage resume, this step comparative voltage sampled value and recovery voltage set point, if voltage sample value is greater than recovery voltage set point, is then judged to be voltage resume state, enters step c5, otherwise, return sampling input step b;
C5) for judging the step of decompression time-out, this step compares the decompression time and shakes electric permission time set point, if the decompression time is greater than the electric permission time set point of rolling, then be judged to be decompression timeout mode, forward step e to and exit anti-shake electric protection state, otherwise, be judged to shake electric fault, forward steps d to, perform anti-shake electric restart operation;
The described step e exiting anti-shake electric protection state is protective device discharge step, and this step comprises following action:
Stop and removing charge timer;
Exit protective device charging complete state.
The better technical scheme of the anti-shake electric protection method of use computer program control realization power consumption equipment of the present invention is:
The sampled value of described sampling input step b at least comprises three-phase voltage sampled value and three-phase current sampled value;
The step c1 of described judgement decompression state comprises the action comparative result of three-phase voltage sampled value and low voltage set value being carried out to AND operation;
The step c2 of described judgement overcurrent locking comprises the action comparative result of three-phase current sampled value and overcurrent set point being carried out to negative OR operation;
The step c4 of described judgement voltage resume comprises the action comparative result of three-phase voltage sampled value and recovery voltage set point being carried out to inclusive-OR operation.
The technical scheme of the further improvement of the anti-shake electric protection method of use computer program control realization power consumption equipment of the present invention is: the setup parameter described in step a also comprises start-up time delay set point, and described steps d of restarting output for anti-shake electricity also comprises start-up study device and sends according to the time delay of start-up time delay set point shakes electricity and recover to restart the action of signal.
Another object of the present invention to provide a kind of anti-shake electrical protective device implementing said method, solves the circuit structure complexity of the survival network of prior art, cost is high, reliability is lower, the technical problem of maintenance difficult.
The present invention solves the problems of the technologies described above adopted technical scheme:
A kind of anti-shake electrical protective device implementing above-mentioned anti-shake electric protection method, by Microcomputer Protection device, voltage transmitter, current transformer, A.C. contactor, start button, stop button, control switch forms, 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 line voltage input, the main contacts of current transformer and A.C. contactor is connected in series in load current loop, the output of voltage transmitter connects CPU by voltage signal processing module, the output of current transformer is connected to CPU by current signal processing module, control module is connected to control switch, start button, stop button, the control loop that the auxiliary contact of A.C. contactor are connected with coil, it is characterized in that described CPU at least comprises following functional module:
For performing the microprocessor of the control program of anti-shake electric protection method;
For storing the program storage device of the control program of described anti-shake electric protection method;
For the analog-to-digital conversion module of voltage and current sample input;
For register or the data storage device of storage voltage and current sampling data;
For storing the data storage device of the setup parameter inputted by human-machine interface unit;
For comparing the comparator software function module of sampled value and setup parameter;
For identifying the rolling electricity condition decision logic functional module of electrical network rolling electric fault.
Be applicable to an anti-shake electrical protective device for the above-mentioned anti-shake electric protection method of enforcement of three phase network, described comparator software function module comprises:
Three for comparing three-phase voltage sampled value and low voltage set value, judging the comparator of decompression state;
Three for comparing three-phase current sampled value and overcurrent set point, judging the comparator of over-current state;
Three for comparing three-phase voltage sampled value and recovery voltage set point, judging the comparator of voltage resume.
The one of the anti-shake electrical protective device of the above-mentioned anti-shake electric protection method of enforcement of the present invention preferably technical scheme is:
Described rolling electricity condition decision logic functional module comprises overcurrent locking decompression judge module, decompression time-out judge module and overtime blocking voltage and recovers judge module;
Described overcurrent locking decompression judge module is judged to judge that NOR gate and overcurrent locking and door form with door, overcurrent by decompression, three judge that the output of the comparator of decompression state is connected to decompression and judges the input with door, three judge that the output of the comparator of over-current state is connected to the input that overcurrent judges NOR gate, and decompression judges to judge that the output of NOR gate is connected to the input of overcurrent locking and door with door and overcurrent;
Described decompression time-out judge module is a logic judgment module comprising decompression timer, the output of overcurrent locking and door is connected to decompression timer, start decompression timer and carry out decompression timing, if the clocking value of decompression timer is less than the electric permission time set point of rolling, decompression time-out judge module exports high level, otherwise, output low level;
Described overtime blocking voltage is recovered judge module and to be judged by voltage resume or door and overtime locking and door form, three judge that the output of the comparator of voltage resume is connected to the input of voltage resume judgement or door, and the output of voltage resume judgement or door and the output of decompression time-out judge module are connected to the input of overtime locking and door;
Described rolling electricity condition decision logic functional module is connected to described control module by the output of overtime locking and door, sends rolling electricity recover to restart signal by control module.
The better technical scheme of the anti-shake electrical protective device of the above-mentioned anti-shake electric protection method of enforcement of the present invention is: described anti-shake electrical protective device also comprises delayer functional module; the output of described rolling electricity condition decision logic functional module is connected to delayer functional module; start-up study device, according to the time delay of start-up time delay set point, sends rolling electricity by described control module time delay and recovers to restart signal.
The better technical scheme of one of the anti-shake electrical protective device of the above-mentioned anti-shake electric protection method of enforcement of the present invention is: described anti-shake electrical protective device also comprises protective device charging/discharging function module, described protective device charging/discharging function module judges and door by there being pressure, stream is had to judge and door, charge initiation forms with door and charge timer, pressure is had to judge to flow with having the input that the output judged with door is connected to charge initiation and door with door, the output of charging time delay and door is connected to startup charge timer, there is press strip part if meet simultaneously and have stream condition, charge timer starts timing, set point when if the clocking value of charge timer exceedes chargometer, charge timer exports high level, enter protective device charging complete state.
The charge timer of above-mentioned protective device charging/discharging function module is provided with discharge reduction input; this discharge reduction input by or door be connected to and shake electricity condition decision logic functional module; if described rolling electricity condition decision logic functional module detects overcurrent blocking or decompression timeout mode; or send shake electricity recover restart signal after; discharge reduction input is set to high level, and protective device discharges and exits protective device charging complete state.
The invention has the beneficial effects as follows:
The overcurrent locking decompression judgement that the present invention adopts in electrical network shakes electric recognition technology scheme, decompression time-out locking judgement and voltage resume judge, effectively can distinguish electric network fault and electric motor short circuit accident, electrical network and shake heterogeneity, dissimilar fault or the accident event such as electric fault and electrical breakdown accident, avoid protective device to occur in electric motor short circuit accident and electrical breakdown accident misoperation event, ensure equipment and personal safety;
The present invention is adopted in control software design structural design and to be inputted by man-machine interface and to store setup parameter, can realize neatly, by part throttle characteristics, network characteristic setting overcurrent set point, the basic detection and control parameter such as electric permission time set point and start-up time delay set point of shaking, improve reliability and the control precision of anti-shake electric protection;
Protective device discharge and recharge scheme of the present invention, not only effectively can avoid causing motor to start suddenly because of protective device misoperation or the long-term dead electricity of electrical network, ensure equipment and personal safety; But also ensured that the action under electrical network shakes electricity condition of rolling electric installation once, avoids short time internal cause system repeatedly rolling conductance machine of sending a telegraph repeatedly start and stop.
Adopted rolling electricity of the present invention recovers delayed startup scheme, can configure different start-up time delay set points according to power consumption equipment character, and when realizing electrical network rolling electricity, point batch initiation of motor and power consumption equipment, makes electrical network from heavy current impact;
The present invention's employing and door and or gate logic arbitration functions module complete and shake electricity condition decision logic, can avoid malfunction or the tripping of protective device, ensured the reliability of protective device action;
The inventive method adopts computer program control realization rolling electricity to identify and defencive function; the circuit structure not only solving existing survival network is complicated, cost is high, reliability is lower, the problem of maintenance difficult, and possesses that defencive function is powerful flexibly, management is arranged conveniently, sample rate is fast, sampling good stability, control precision are high and the anti-interference feature such as by force.
Accompanying drawing explanation
Fig. 1 uses the software flow pattern of the anti-shake electric protection method of computer program control realization power consumption equipment;
The Microcomputer Protection device hardware block diagram of the anti-shake electrical protective device of Fig. 2;
Fig. 3 shakes the logic diagram of electricity condition decision logic functional module;
The hardware configuration of the anti-shake electrical protective device of Fig. 4 and winding diagram;
The logic diagram of Fig. 5 protective device charging/discharging function module.
Embodiment
In order to technique scheme of the present invention can be understood better, describe in detail further below in conjunction with drawings and Examples.
Fig. 1 is the software flow pattern of the anti-shake electric protection method of use computer program control realization power consumption equipment of the present invention first embodiment; the flow chart of the present embodiment only contains the basic step realizing the anti-shake electric protection method of power consumption equipment, do not comprise those skilled in the art the well-known routines step needed for process such as the microsystem computer software and hardware power-up initializing be familiar with.The basic step realizing the anti-shake electric protection method of power consumption equipment provided by the invention comprises:
Step a, for inputting setup parameter and setup parameter being stored into the step of storage device:
The parameter realized involved by the anti-shake electric protection of power consumption equipment comprises the low voltage set value for judging decompression; for judging the overcurrent set point of overcurrent; for judging to power on and the recovery voltage set point of voltage resume; that charges for judgment means has stream set point; set point during for judging to charge stable chargometer, the setup parameters such as the rolling electricity permission time set point judged for decompression time-out, the start-up time delay set point that controls for delayed startup.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, when having stream set point to fix value 1000mA, chargometer, set point fixes value 10S, for convenience of operation, these preset parameters pre-set and store in memory.Overcurrent set point d1, shake electric permission time set point d2 and start-up time delay set point d3 load set as required; input key group 1073 by Microcomputer Protection device inputs; and be stored in the eprom memory 1053 of central signal processing unit 105, see Fig. 2.
Step b, for the step of input of sampling, sampled value to line voltage and the input of load current real-time sampling, and is stored into storage device by this step:
Three-phase voltage U a, Ub, Uc becomes DC simulation signal after voltage transmitter 200 is changed, CPU 105 is sent to by current signal processing module 102, three-phase current Ia, Ib, Ic becomes mA level current signal after current transformer 300 is changed, CPU 105 is sent to by voltage signal processing module 103, voltage sample value and current sampling data is converted to again by the analog to digital converter 1051 of CPU 105, be stored 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, for comparing sampled value and setup parameter, judges the step identifying electrical network rolling electric fault:
In the present embodiment, this step is called that overcurrent locking decompression time-out judges flow process, its basic logic functions as shown in Figure 3, comprise the step f for judging decompression state, for judging the step g of overcurrent locking, for starting the step h of decompression timer, for judging the step I of voltage resume and the step j for judging decompression time-out.
Steps d, restarts the step of output for anti-shake electricity, this step sends rolling electricity by output port and recovers to restart signal, controls power consumption equipment and resumes operation:
In the present embodiment, this step comprises start-up study device and sends according to the time delay of start-up time delay set point the action that rolling electricity recovers to restart signal.If step c judged result is electrical network rolling electric fault, program control start-up study device carries out timing, when timing is to start-up time delay set point d3 value, sends triggering signal to control module 106, is sent by the relay contact 1062 of control module.The object arranging delayed startup is in order to avoid motor and power consumption equipment are occurring to start when shaking electrification simultaneously, forms larger impulse current.By arranging different start-up time delay set point d3 numerical value, realize motor and power consumption equipment divides batch initiation, can slow down and shake after electricity terminates, motor and power consumption equipment start the impact to electrical network.
The technical scheme of the present embodiment also comprises the step of protective device charging, arranges the link of protective device charging, is that its logic function as shown in Figure 5 in order to avoid shaking electrical protective device misoperation.
Step k, comprises following action:
Comparative voltage sampled value and recovery voltage set point, judge there is press strip part, in the present embodiment, have press strip part to be that supply voltage will reach 90% of specified phase voltage 220V, that is, U>198V;
Compare current sampling data and have stream set point, judging there is stream condition, in the present embodiment, have stream condition to be that load current will reach 1000mA, i.e. I>1000mA;
There is press strip part if meet simultaneously and have stream condition, starting charge timer, performing 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, t>10S; then enter protective device charging complete state; forward the step c judging to identify electrical network rolling electric fault to, otherwise, return sampling input step b.
Step e, for exiting the step of anti-shake electric protection state:
The object arranging this step ensures that anti-shake electric protection method of the present invention returns to form after program execution terminates, and in the present embodiment, this step is protective device discharge step, and this step comprises following action:
Stop and removing charge timer;
Exit protective device charging complete state.
Below to the overcurrent locking decompression time-out described in step c, composition graphs 1 and Fig. 3 judge that flow process is illustrated further again, and this flow process comprises the steps:
Step c1, for judging the step of decompression state, this step comparative voltage sampled value and low voltage set value, in the present embodiment, low voltage set value is 154V, namely Rule of judgment is U<154, if voltage sample value is less than low voltage set value, be then judged to be decompression state, forward overcurrent locking comparison step c2 to, otherwise, forward the step c4 that voltage resume judges to;
In the present embodiment, judge that the step c1 of decompression state comprises the action comparative result of three-phase voltage sampled value and low voltage set value being carried out to AND operation, that is, the criterion of this step is that to be all less than 154V be low-voltage for Ua, Ub, Uc;
This step detects low voltage signal; abnormal with regard to illustrative system; this is abnormal is likely that motor or power consumption equipment short circuit accident cause; also be likely electrical network in short-term or long time decompression cause; therefore; need to carry out overcurrent locking judgement further by step c2, avoid the low-voltage caused because of short circuit to cause protective device misoperation.
Step c2, for judging the step of overcurrent locking, this step compares current sampling data and overcurrent set point d1, namely Rule of judgment is I>d1, if current sampling data is greater than overcurrent set point, be then judged to be overcurrent blocking, forward step e to and exit anti-shake electric protection state, otherwise, enter step c3;
In the present embodiment, judge that the step c2 of overcurrent locking comprises the action comparative result of three-phase current sampled value and overcurrent set point being carried out to negative OR operation.
Step c3, for starting the step of decompression timer;
Step c4, for judging the step of voltage resume, this step comparative voltage sampled value and recovery voltage set point, in the present embodiment, recovery voltage set point is 198V, namely Rule of judgment is U>198, if voltage sample value is greater than recovery voltage set point, be then judged to be voltage resume state, enter step c5 and judge decompression time-out, otherwise, return sampling input step b;
In the present embodiment, judge that the step c4 of voltage resume comprises the action comparative result of three-phase voltage sampled value and recovery voltage set point being carried out to inclusive-OR operation.
Step c5; for judging the step of decompression time-out, this step compares the rolling electricity permission time set point d2 stored in decompression time and storage device, if the decompression time is greater than the electric permission time set point of rolling; then be judged to be decompression timeout mode; illustrate that the reason of low-voltage is not that electrical network rolling electricity causes, but the long-term dead electricity of electrical network, program forwards step e to and exits anti-shake electric protection state; otherwise; be judged to shake electric fault, forward steps d to, perform anti-shake electric restart operation.
Fig. 4 is hardware configuration and the winding diagram of an embodiment of the anti-shake electrical protective device of the above-mentioned anti-shake electric protection method of enforcement of the present invention.The anti-shake electrical protective device of the present embodiment adopts integral structure, by Microcomputer Protection device 100, voltage transmitter 200, current transformer 300, A.C. contactor 400, start button 500, stop button 600, control switch 700 forms, and 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 line voltage input, current transformer 300 is connected in series in load current loop with the main contacts of A.C. contactor 400, the output of voltage transmitter 200 connects CPU 105 by voltage signal processing module 103, the output of current transformer 300 is connected to CPU 105 by current signal processing module 103, and control module 106 is connected to control switch 700, start button 500, stop button 600, the control loop that the auxiliary contact 401 of A.C. contactor 400 are connected with coil 402.
In the present embodiment, voltage transmitter 200 is for becoming the DC simulation signal required by voltage signal processing module 103 by the voltage isolation transmit in electrical network.Described current transformer 300 is Three-phase combined-type current transformer, for load current being transformed into the input current scope required by current signal processing module 102.The main contact of A.C. contactor 400 switches on or off for controlling motor primary circuit power supply, its secondary contact 401 is in parallel with start button 500, be energized for retentive control ac contactor coil 402 after electric motor starting, ac contactor coil 402 closes for controlling AC contactor main contact or disconnects.Start button 500, stop button 600, control switch 700 model is used for anti-shake controller for electric consumption control loop and switches on or off.
In the present embodiment, anti-shake electrical protective device is connected to three-phase alternating-current supply by outside circuit breaker DL, and the external loading being connected to anti-shake electrical protective device is motor.The external terminal mode of connection of anti-shake electrical protective device is, lower pile crown L1, L2, L3 of terminals T1, T3, T5 difference connecting breaker DL of protective device; Terminals T2, T4, T6 of protective device connect inlet wire pile crown U, V, W of motor respectively, and terminals N is connected with power supply N line.
The internal main circuit connection method of the anti-shake electrical protective device of the present embodiment is; terminals T1, T3, T5 of three single-core cable difference jockeys; and be connected with A.C. contactor 400 main contact J1, J2, J3 respectively through after current transformer 300 iron core, A.C. contactor 400 main contact J4, J5, J6 are connected with terminals T2, T4, T6 of device respectively.
The inner control loop mode of connection of the anti-shake electrical protective device of the present embodiment is, control line 1 is drawn by the terminals T5 of device, be connected to control switch 700 left side terminals, control switch 700 right side terminals draws control line 3, be connected to stop button 600 left side terminals, stop button 600 right side terminals draws control line 5, be connected to the output common terminal OCOM of Microcomputer Protection device switching value terminals row 108, the terminals O1 of Microcomputer Protection device output switch parameter terminals row 108 draws control line 7, be connected to start button 500 right side terminals, start button 500 left side terminals draws control line 9, be connected to ac contactor coil 402 left side terminals, ac contactor coil 402 right side terminals draws control line 2, be connected to the terminals N of protective device.
The internal measurement circuit connection method of the anti-shake electrical protective device of the present embodiment is; control line 11,12,13 is drawn respectively by terminals T1, T3, T5 of protective device; 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 Microcomputer Protection device detects terminals row 101.Three-phase combined-type current transformer 300 secondary line Ia, Ib, Ic, directly detect Ia, Ib, Ic terminals that terminals arrange 101 and be connected with Microcomputer Protection device.
The control loop of the motor start up operation of the anti-shake electrical protective device of the 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
After the startup of the anti-shake electrical protective device of the present embodiment, the control loop of running status is:
Power line L3-control switch 700-stop button 600-relay normally-closed contact 1061-auxiliary contact 401-coil 402-power line N
During motor shut-down operation, press stop button 600, ac contactor coil 402 dead electricity, its auxiliary contact 401 disconnects, and after stop button 600 is resetted, maintains the open circuit of ac contactor coil 402.
Feature when electrical network shakes electric is the first decompression of power supply, and voltage instantaneous recovers normal thereafter.When line voltage is with no pressure; ac contactor coil 402 is because of the power-off of electrical network decompression; after in device, Microcomputer Protection device 100 detects electrical network rolling electricity; its output relay action; then the contact 1061 of output relay by closed changing disconnection into, contact 1062 is changed into closed by disconnection; when electrical network occurs to shake electric fault, the control loop of the anti-shake electrical protective device of the present embodiment is:
Power line L3-control switch 700-stop button 600-relay normally open contact 1062-coil 402-power line N
Ac contactor coil 402 will recover at line voltage and recover powered under effect that Microcomputer Protection device output relay contact 1062 is closed.
In the present embodiment, current signal processing module 102 is rectification filtering and amplifying circuit, and its effect is that the digital to analog converter 1051 being become by the current-mode analog quantity signal rectification collected by current transformer 300 direct current signal to send in central signal processing unit 105 carries out AD conversion.AD conversion adopts synchronized sampling pattern, namely gathers the voltage and current value of same passage simultaneously; , in sampling channel configuration register, three electric current and voltage passages are arranged in order meanwhile, make under a timer triggers, the disposable conversion completing all passages.Voltage signal processing module 103 is pressure filter circuit, its effect is the voltage analog signal will collected by voltage transmitter 200, the digital to analog converter 1051 sent into after converting direct current signal in central signal processing unit 105 carries out AD conversion calculating, and all analog-to-digital conversion all adopt timer internal down trigger.Power module 104 is ac-dc converter circuit, and its effect is stable 5V DC power supply by the 220V Power convert of input, as central signal processing unit 105 DC power supply.Described central signal processing unit 105 is Microcomputer Protection device 100 core module, is made up of 12 high precision digital-to-analog converters 1051, high-performance microprocessor 1052, mass storage 1053.Control module 106 is output relay, and output relay has 2 auxiliary contacts, and wherein a secondary normally opened contact 1062 is for connecting A.C. contactor 400 control loop when electrical network shakes electric.The major function of man-machine interaction unit 107 realizes transmitter to the various information in the order of device and display unit; be equivalent to the combination of computor-keyboard and display; pass through man-machine interaction unit; can easily according to different object of protections and requirement; input or revision overcurrent set point d1, the set points such as electric permission time set point d2 and start-up time delay set point d3 of shaking, 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 group 1073.Light-emitting diode display 1071 is made up of 4 charactrons, for showing 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 time normal, indicator light flicker during fault.Button group 1073 is made up of 5 touch-keys, is respectively used to, involution after device action, menu display, setting parameter increases progressively, setting parameter successively decreases, setting parameter confirms.
In the present embodiment, CPU 105 also comprises following functional module:
For performing the microprocessor 1052 of the control program of anti-shake electric protection method;
For storing the program storage device 1053 of the control program of described anti-shake electric protection method;
For the analog-to-digital conversion module 1051 of voltage and current sample input;
For register or the data storage device of 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;
For storing the data storage device 1053 of the setup parameter inputted by human-machine interface unit;
For comparing the comparator software function module of sampled value and setup parameter;
For identifying the rolling electricity condition decision logic functional module of electrical network rolling electric fault.
Above-mentioned comparator software function module comprises: three for comparing three-phase voltage sampled value and low voltage set value, judging the comparator of decompression state; Three for comparing three-phase current sampled value and overcurrent set point, judging the comparator of over-current state; Three for comparing three-phase voltage sampled value and recovery voltage set point, judging the comparator of voltage resume.
Above-mentioned rolling electricity condition decision logic functional module comprises overcurrent locking decompression judge module L01, decompression time-out judge module L01 and overtime blocking voltage and recovers judge module L03, see Fig. 3.Arrange shake the object of electricity condition decision logic functional module be used to identify low-voltage be line voltage rock cause or cause because of over current of motor; rock cause if low-voltage is electrical network, start anti-shake electric protection function; otherwise, then the anti-shake electric protection function of locking.
Overcurrent locking decompression judge module L01 is judged to judge that NOR gate L012 and overcurrent locking and door L013 form with door L011, overcurrent by decompression, three judge that the output of the comparator of decompression state is connected to decompression and judges the input with door L011, three judge that the output of the comparator of over-current state is connected to the input that overcurrent judges NOR gate L012, and decompression judges to judge that the output of NOR gate L012 is connected to the input of overcurrent locking and door L013 with door L011 and overcurrent.
Decompression time-out judge module L02 is a logic judgment module comprising timer Lbd, the output of overcurrent locking and door L013 is connected to timer Lbd, start timer Lbd and carry out decompression timing, if the clocking value of timer Lbd is less than the electric permission time set point d2 of rolling, decompression time-out judge module L02 exports high level, otherwise, output low level.
Described overtime blocking voltage is recovered judge module L03 and to be judged by voltage resume or door L031 and overtime locking and door L032 form, three judge that the output of the comparator of voltage resume is connected to the input of voltage resume judgement or door L031, and the output of voltage resume judgement or door L031 and the output of decompression time-out judge module L02 are connected to the input of overtime locking and door L032; Voltage resume judge module L03 adopts or the object of door is that device tripping, improves the reliability of anti-shake electric installation in order to avoid breaking because of certain phase secondary line.
Electricity condition decision logic functional module of shaking exports electrical network by overtime locking and the output of door L032 and shakes the signal of telecommunication, and rolling electricity condition decision logic functional module can be directly connected to control module 106, sends the electric recovery of rolling restart signal by control module 106.
The anti-shake electrical protective device of the present embodiment also comprises software function module delayer; in the present embodiment; the output of rolling electricity condition decision logic functional module is connected to delayer functional module; by program control start-up study device according to start-up time delay set point d3 time delay, send rolling electricity by described control module 106 time delay and recover to restart signal.
The anti-shake electrical protective device of the present embodiment also comprises protective device charging/discharging function module, described protective device charging/discharging function module judges and door L11 by there being pressure, stream is had to judge and door L12, charge initiation and door L13 and charge timer Lcd form, see Fig. 5, pressure is had to judge to flow with having the input that the output judged with door L12 is connected to charge initiation and door L13 with door L11, the output of charging time delay and door L13 is connected to and starts charge timer Lcd, there is press strip part if meet simultaneously and have stream condition, i.e. U>198V, I>1000mA, charge timer Lcd starts timing, set point 10S when if the clocking value of charge timer Lcd exceedes chargometer, charge timer Lcd exports high level, enter protective device charging complete state.
The charge timer Lcd of above-mentioned protective device charging/discharging function module is provided with discharge reduction input; this discharge reduction input by or door be connected to and shake electricity condition decision logic functional module; if described rolling electricity condition decision logic functional module detects overcurrent blocking or decompression timeout mode; or send shake electricity recover restart signal after; discharge reduction input is set to high level, and protective device discharges and exits protective device charging complete state.
Microcomputer Protection device charging link is set; in order to avoid shaking electric installation misoperation, this is because, before the circuit breaker DL that closes; device meet with no pressure, without stream condition; it is 1 that L013 and door export, and close after circuit breaker DL, device is sent a telegram here suddenly; the output of L031 or door is 1; shaking electric installation will action, thus can cause motor unplanned startup after delayer time delay, jeopardizes personal security.After being provided with charging link, before the circuit breaker DL that closes, device is without stream, i.e. I<1000mA, device can not charge, even if so now device meet with no pressure, without stream condition, device also can not action, and only after the circuit breaker DL that closes, what meet charging has press strip part, then close after electric motor starting button 500, what meet charging has stream condition, then after time delay in 10 seconds, meets the stable operation condition of charging, device just can complete charging, thus prepares for shaking the operation of electric installation.
Those of ordinary skill in the art will be appreciated that; above embodiment is only used to technical scheme of the present invention is described; and be not used as limitation of the invention; any the above embodiment is done based on connotation of the present invention change, modification, all will drop in the protection range of claim of the present invention.
Claims (9)
1. use the anti-shake electric protection method of computer program control realization power consumption equipment, comprise following steps:
A) for inputting setup parameter and setup parameter being stored into the step of storage device, described setup parameter at least comprises overcurrent set point and shakes electric permission time set point;
B) for the step of input of sampling, sampled value to line voltage and the input of load current real-time sampling, and is stored into storage device by this step;
C) for comparing sampled value and setup parameter, the step identifying electrical network rolling electric fault is judged;
D) restart the step of output for anti-shake electricity, this step sends rolling electricity by output port and recovers to restart signal, controls power consumption equipment and resumes operation;
E) for exiting the step of anti-shake electric protection state;
It is characterized in that:
Also comprise after described sampling input step b:
B1: for the protection of the step of device charging, this step comprises following action:
Comparative voltage sampled value and recovery voltage set point, judge there is press strip part;
Compare current sampling data and have stream set point, judging there is stream condition;
There is press strip part if meet simultaneously and have stream condition, starting charge timer, performing charging interval timing;
Relatively the charging interval and stabilization time set point, if the charging interval reaches set point stabilization time, then enter protective device charging complete state, forward to and judge to identify that electrical network shakes the step c of electric fault, otherwise, return sampling input step b;
The step c of described judgement identification electrical network rolling electric fault is that overcurrent locking decompression time-out judges flow process, and this flow process comprises the steps:
C1) for judging the step of decompression state, this step comparative voltage sampled value and low voltage set value, if voltage sample value is less than low voltage set value, then be judged to be decompression state, forward overcurrent locking comparison step c2 to, otherwise, forward the step c4 judging voltage resume to;
C2) for judging the step of overcurrent locking, this step compares current sampling data and overcurrent set point, if current sampling data is greater than overcurrent set point, is then judged to be overcurrent blocking, forwards step e to and exits anti-shake electric protection state, otherwise, enter step c3;
C3) for starting the step of decompression timer;
C4) for judging the step of voltage resume, this step comparative voltage sampled value and recovery voltage set point, if voltage sample value is greater than recovery voltage set point, is then judged to be voltage resume state, enters step c5, otherwise, return sampling input step b;
C5) for judging the step of decompression time-out, this step compares the decompression time and shakes electric permission time set point, if the decompression time is greater than the electric permission time set point of rolling, then be judged to be decompression timeout mode, forward step e to and exit anti-shake electric protection state, otherwise, be judged to shake electric fault, forward steps d to, perform anti-shake electric restart operation;
The described step e exiting anti-shake electric protection state is protective device discharge step, and this step comprises following action:
Stop and removing charge timer;
Exit protective device charging complete state.
2. the anti-shake electric protection method of use computer program control realization power consumption equipment according to claim 1, is characterized in that:
The sampled value of described sampling input step b at least comprises three-phase voltage sampled value and three-phase current sampled value;
The step c1 of described judgement decompression state comprises the action comparative result of three-phase voltage sampled value and low voltage set value being carried out to AND operation;
The step c2 of described judgement overcurrent locking comprises the action comparative result of three-phase current sampled value and overcurrent set point being carried out to negative OR operation;
The step c4 of described judgement voltage resume comprises the action comparative result of three-phase voltage sampled value and recovery voltage set point being carried out to inclusive-OR operation.
3. the anti-shake electric protection method of use computer program control realization power consumption equipment according to claim 1 and 2; it is characterized in that the setup parameter described in step a also comprises start-up time delay set point, described steps d of restarting output for anti-shake electricity also comprises start-up study device and sends according to the time delay of start-up time delay set point shakes electricity and recovers to restart the action of signal.
4. one kind implements the claims the anti-shake electrical protective device of the anti-shake electric protection method described in 1, by Microcomputer Protection device, voltage transmitter, current transformer, A.C. contactor, start button, stop button, control switch forms, 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 line voltage input, the main contacts of current transformer and A.C. contactor is connected in series in load current loop, the output of voltage transmitter connects CPU by voltage signal processing module, the output of current transformer is connected to CPU by current signal processing module, control module is connected to control switch, start button, stop button, the control loop that the auxiliary contact of A.C. contactor are connected with coil, it is characterized in that, described CPU at least comprises following functional module:
For performing the microprocessor of the control program of anti-shake electric protection method;
For storing the program storage device of the control program of described anti-shake electric protection method;
For the analog-to-digital conversion module of voltage and current sample input;
For register or the data storage device of storage voltage and current sampling data;
For storing the data storage device of the setup parameter inputted by human-machine interface unit;
For comparing the comparator software function module of sampled value and setup parameter;
For identifying the rolling electricity condition decision logic functional module of electrical network rolling electric fault.
5. anti-shake electrical protective device according to claim 4, is characterized in that described comparator software function module comprises:
Three for comparing three-phase voltage sampled value and low voltage set value, judging the comparator of decompression state;
Three for comparing three-phase current sampled value and overcurrent set point, judging the comparator of over-current state;
Three for comparing three-phase voltage sampled value and recovery voltage set point, judging the comparator of voltage resume.
6. anti-shake 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, decompression time-out judge module and overtime blocking voltage and recovers judge module;
Described overcurrent locking decompression judge module is judged to judge that NOR gate and overcurrent locking and door form with door, overcurrent by decompression, three judge that the output of the comparator of decompression state is connected to decompression and judges the input with door, three judge that the output of the comparator of over-current state is connected to the input that overcurrent judges NOR gate, and decompression judges to judge that the output of NOR gate is connected to the input of overcurrent locking and door with door and overcurrent;
Described decompression time-out judge module is a logic judgment module comprising decompression timer, the output of overcurrent locking and door is connected to decompression timer, start decompression timer and carry out decompression timing, if the clocking value of decompression timer is less than the electric permission time set point of rolling, decompression time-out judge module exports high level, otherwise, output low level;
Described overtime blocking voltage is recovered judge module and to be judged by voltage resume or door and overtime locking and door form, three judge that the output of the comparator of voltage resume is connected to the input of voltage resume judgement or door, and the output of voltage resume judgement or door and the output of decompression time-out judge module are connected to the input of overtime locking and door;
Described rolling electricity condition decision logic functional module is connected to described control module by the output of overtime locking and door, sends rolling electricity recover to restart signal by control module.
7. anti-shake electrical protective device according to claim 4; it is characterized in that described anti-shake electrical protective device also comprises delayer functional module; the output of described rolling electricity condition decision logic functional module is connected to delayer functional module; start-up study device, according to the time delay of start-up time delay set point, sends rolling electricity by described control module time delay and recovers to restart signal.
8. the anti-shake electrical protective device according to claim arbitrary in claim 4 to 7, it is characterized in that described anti-shake electrical protective device also comprises protective device charging/discharging function module, described protective device charging/discharging function module judges and door by there being pressure, stream is had to judge and door, charge initiation forms with door and charge timer, pressure is had to judge to flow with having the input that the output judged with door is connected to charge initiation and door with door, the output of charging time delay and door is connected to startup charge timer, there is press strip part if meet simultaneously and have stream condition, charge timer starts timing, set point when if the clocking value of charge timer exceedes chargometer, charge timer exports high level, enter protective device charging complete state.
9. anti-shake electrical protective device according to claim 8; it is characterized in that the charge timer of described protective device charging/discharging function module is provided with discharge reduction input; described discharge reduction input by or door be connected to and shake electricity condition decision logic functional module; if described rolling electricity condition decision logic functional module detects overcurrent blocking or decompression timeout mode; or send shake electricity recover restart signal after; discharge reduction input is set to high level, and protective device discharges and exits protective device charging complete state.
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