CN114583660B - Motor relay protection device and method for belt conveyor scratch fault protection - Google Patents
Motor relay protection device and method for belt conveyor scratch fault protection Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0854—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0856—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention discloses a motor relay protection device and a motor relay protection method for scratch fault protection of a belt conveyor, wherein the motor relay protection device comprises an alternating current collecting unit, a switching value input unit, a switching value output unit, a processing unit and a current transformer, wherein the current transformer is used for being arranged on a connecting lead between a power bus and a motor; the alternating current quantity acquisition unit, the switching value input unit and the switching value output unit are connected with the processing unit, the alternating current quantity acquisition unit is connected with the current transformer, the receiving end of the switching value input unit is connected with the circuit breaker, and the transmitting end of the switching value output unit is connected with the circuit breaker. The belt scratch fault detection device can detect the belt scratch fault in real time, give an alarm or automatically trip in time to prevent serious accidents, effectively reduce the scratch fault rate of the belt conveyor and improve the economic benefit of a power plant.
Description
Technical Field
The invention belongs to the technical field of power system relay protection, and can realize the early warning and tripping protection functions of scratch faults of a power plant belt conveyor in a motor relay protection device.
Background
The belt conveyer is commonly called as a belt conveyer, is an important transportation device of a coal conveying system of a thermal power plant, and is driven by a motor, and a closed-loop belt rotating at a constant speed is formed by tensioning, redirecting and other components, so that objects on the belt are driven to move at a constant speed by static friction force, and the aim of conveying materials is fulfilled. The belt accounts for more than 40% of the total conveyor cost, and is a weak link which is easy to damage, so that the protection of the monitoring belt from the minimum damage is of great importance for maintaining the safe operation of the power plant. The belt is scratched or even torn when sharp iron sundries or sharp large rock blocks in the conveyed materials fall, and the belt is the most common damage fault type. The scratch of the belt is light, so that the normal supply of the boiler fuel amount is influenced, and the unit is forced to drop the load or limit electricity to the outside, so that huge economic loss is caused. In recent years, various belt fault diagnosis devices are designed for domestic and foreign research, and embedded detection devices, ultrasonic flaw detection and other modes are adopted, but the problems of insufficient maturity, complex operation and maintenance, investment increase and the like exist. At present, many power plants in China are not provided with an effective belt scratch detection device, so that hidden danger is brought to safe operation of the power plants.
The motor in the belt conveyor is used as an important load of an electric system of a power plant, a motor relay protection device is configured, and the device is used for collecting electric quantities such as current and voltage and protecting logic such as overcurrent, overload, locked-rotor, open-phase, overheat, overlong starting time and the like, monitoring the motor at various common fault angles and timely giving early warning or cutting off faults. The belt is a specific load of the motor, and when a foreign matter scratch problem occurs, the electric quantity at the stator side of the motor may have some fluctuation, but these change characteristics may not necessarily meet the logic conditions of the conventional motor protection. For example, when the belt is scratched by an instantaneous sharp object, the current is suddenly increased in a short time, but the current amplitude and the duration do not necessarily reach the threshold of the overcurrent and overload protection fixed value, so that the protection cannot act; or foreign matters on the belt block the belt to run, and the motor still rotates without blocking rotation, so that the blocking rotation is protected from action; or the current is increased when the belt is scratched, but the materials on the belt are less, the current is close to or lower than the rated current of the motor, at the moment, the conventional protection logic is not started, and the belt is extremely damaged when the belt is continuously operated for a long time. The identification and monitoring of belt scratch faults is a significant problem in conventional protection devices.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides a motor relay protection device and a motor relay protection method for belt conveyor scratch fault protection.
The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the following technical scheme:
a motor overload protection device for belt feeder fish tail fault protection, includes traffic collection unit, switching value input unit, switching value output unit, processing unit and current transformer, wherein:
the current transformer is used for being installed on a connecting wire between a breaker and a power bus of the motor.
The receiving end of the alternating current quantity acquisition unit is used for being connected with the current transformer, and the transmitting end of the alternating current quantity acquisition unit is connected with the processing unit.
The receiving end of the switching value input unit is connected with the circuit breaker, and the transmitting end of the switching value input unit is connected with the processing unit.
The receiving end of the switching value output unit is connected with the processing unit, and the transmitting end of the switching value output unit is connected with the circuit breaker.
Preferably: the device comprises a voltage transformer, wherein the voltage transformer is arranged on a connecting lead between a circuit breaker and a power bus, and a receiving end of an alternating current quantity acquisition unit is used for being connected with the voltage transformer.
Preferably: the display communication unit is connected with the processing unit.
Preferably: the alarm prompting device comprises an alarm prompting unit, wherein the alarm prompting unit is connected with a switching value output unit.
Preferably: the processing unit is a singlechip.
Preferably: the processing unit comprises a current extraction module, a first three cycle phase current average amplitude extraction module, a motor running state discrimination module, a current sudden increase discrimination module, an overcurrent discrimination module and a first or circuit, wherein: the current extraction module is respectively connected with the first three cycle phase current average amplitude extraction modules, the current running state discrimination modules, the current sudden increase discrimination modules and the over-current discrimination modules, the current running state discrimination modules are respectively connected with the first three cycle phase current average amplitude extraction modules, the current sudden increase discrimination modules and the over-current discrimination modules, and the current sudden increase discrimination modules and the over-current discrimination modules are connected with the first or circuit.
Preferably: the current extraction module is used for extracting three-phase current according to the collected current. Calculating the current amplitude I of each phase in real time according to the extracted three-phase current ph And a three-phase maximum current value I max 。
The first three cycle phase current average amplitude extraction modules are used for memorizing six current amplitudes at intervals of half cycle, and obtaining current real-time first three cycle phase current average amplitudes at each sampling moment
The motor running state judging module comprises a first position combining judging circuit, a first motor running state comparing circuit, a first motor running state and circuit and a second motor running state and circuit, wherein the first position combining judging circuit is used for judging whether the position of a circuit breaker of the motor is in a position combining state or not and sending the information that the circuit breaker is in the position combining state to the first motor running state and circuit. The first motor operation state comparison circuit is used for comparing the three-phase maximum current value I max Comparing with the high limit value and the low limit value of the light load current, if the three-phase maximum current value I max And when the current is between the light load current high limit value and the light load current low limit value, outputting a first comparison signal to the first motor running state and circuit. If the three-phase maximum current value I max Is larger than the light load current high limit valueAnd outputting a second comparison signal to a second motor running state and circuit. And the first motor running state and circuit obtains a signal of the motor in a light load running interval according to the combination information and the first comparison signal, and sends the signal of the motor in the light load running interval to the current sudden increase judging module. And the second motor running state and circuit performs AND operation according to the combination information and the second comparison signal to obtain a signal that the motor is in a normal running interval, and sends the signal that the motor is in the normal running interval to the overcurrent judging module.
Preferably: the current sudden increase judging module comprises a starting sudden increase submodule, a phase current sudden increase value calculating circuit, a first current sudden increase comparing circuit, a first current sudden increase timer, a second current sudden increase comparing circuit, a first timing comparing circuit and a first current sudden increase and circuit.
The starting sudden increase submodule is used for starting a phase current sudden increase value calculation circuit, a first current sudden increase comparison circuit, a first current sudden increase timer, a second current sudden increase comparison circuit, a first timing comparison circuit and a first current sudden increase and circuit according to the light load operation interval signal sent by the motor operation state judging module.
The first phase current surge value calculation circuit is used for calculating the current amplitude I of each phase ph And the current average amplitude of the current front three cyclic wave phases in real time is subjected to difference and then is subjected to modulus taking to obtain the first phase current surge value,
the first current surge comparison circuit is used for comparing the first phase current surge value with a phase current surge set value, and if the first phase current surge value is larger than the phase current surge set value, the current real-time front three cycle phase current average amplitude values in the initial meeting process are obtainedIs memory value->And simultaneously starting a first current surge timer to count so as to obtain a current surge timer t1.
For the second phase current surge value calculation circuitTo be per-phase current amplitude I ph And a memory valueAnd taking a mode after the difference to obtain the second-phase current surge value.
The second current sudden increase comparison circuit compares the second phase current sudden increase value with a phase current sudden increase set value, and if the second phase current sudden increase value is larger than the phase current sudden increase set value, a current sudden increase comparison signal is obtained and is sent to the first current sudden increase and circuit.
The first timing comparison circuit is used for comparing the current surge time t1 with the phase current surge delay time, and if the current surge time t1 is larger than the phase current surge delay time, a current surge delay signal is sent to the first current surge and circuit.
And the first current sudden increase and circuit is used for performing AND operation according to the current sudden increase comparison signal and the current sudden increase delay signal, and if the current sudden increase comparison signal and the current sudden increase delay signal are true at the same time, the phase current sudden increase criterion is met, and the phase current sudden increase criterion signal meeting the light load operation interval is sent to the first or circuit.
The overcurrent judging module comprises a starting judging sub-module, a current continuous overrun judging sub-module, a current overrun accumulated times overrun judging sub-module and an overcurrent judging or circuit
The starting judging sub-module starts the current continuous overrun judging sub-module, the current overrun accumulated times overrun judging sub-module and the overcurrent judging or circuit according to the normal operation interval signal sent by the motor operation state judging module.
The current duration overrun judging submodule comprises a current duration overrun comparing circuit, a current duration overrun timer and a current duration overrun comparing circuit,
the current continuous overrun comparison circuit is used for comparing three-phase maximum current value I max Comparing with the set value of the continuous out-of-limit current, if the three-phase maximum current value I max When the starting current is larger than the set value of the continuous out-of-limit current, the starting current is continuously out-of-limit The timer counts to obtain the current continuous overrun time t2.
The current duration overrun comparison circuit is used for comparing the current duration overrun time t2 with a current duration overrun time set value, if the current duration overrun time t2 is larger than the current duration overrun time set value, the current duration overrun criterion of the overcurrent in the normal operation interval is met, and a current duration overrun signal of the overcurrent in the normal operation interval is sent to the overcurrent judgment or circuit.
The current out-of-limit accumulated time out-of-limit judging submodule comprises a current out-of-limit accumulated time comparison circuit, a current out-of-limit accumulated time timer, a first current out-of-limit accumulated time comparison circuit, a second current out-of-limit accumulated time comparison circuit and a current out-of-limit accumulated time and circuit.
The current out-of-limit cumulative frequency comparison circuit is used for comparing the three-phase maximum current value I max Comparing with the over-limit current set value of the current over-limit accumulated times, if the three-phase maximum current value I max When the current threshold value is larger than the current threshold value, starting the current threshold value timer to count the current threshold value timer to obtain the current threshold value timer t3, and counting the three-phase maximum current value I max Is greater than the current threshold value n of the current threshold value.
The first current out-of-limit accumulated time comparing circuit is used for comparing the current out-of-limit accumulated time timing t3 with an accumulated time window set value, and if the current out-of-limit accumulated time timing t3 is smaller than the accumulated time window set value, the first current out-of-limit accumulated time comparing circuit sends a current out-of-limit accumulated time timing smaller than a signal to the current out-of-limit accumulated time and circuit.
The second current out-of-limit cumulative frequency comparison circuit is used for three-phase maximum current value I max Comparing the number n of over-limit current set values greater than the accumulated number of over-limit current with the set value of accumulated over-limit current set value, if the three-phase maximum current value I max The number n of the over-limit current set values which is larger than the current over-limit accumulated number is larger than the accumulated time window set value accumulated over-limit number set value, and the over-limit accumulated number of the current is larger than the signal to the over-limit accumulated number and circuit.
And the current out-of-limit accumulated time and circuit performs AND calculation according to the fact that the current out-of-limit accumulated time count is smaller than the signal and the current out-of-limit accumulated time count is larger than the signal, if the current out-of-limit accumulated time count is smaller than the signal and the current out-of-limit accumulated time count is larger than the signal and is true at the same time, the current out-of-limit accumulated time count out-of-limit criterion of the over-current in the normal operation interval is met, and the over-current out-of-limit accumulated time count out-of-limit signal of the over-current in the normal operation interval is sent to the over-current judgment or circuit.
The over-current judgment or circuit performs or calculates according to the current continuous over-limit signal of the over-current in the normal operation region and the current out-of-limit accumulated number of times out-of-limit signal of the over-current in the normal operation region, and if one of the current continuous over-limit signal of the over-current in the normal operation region and the current out-of-limit accumulated number of times out-of-limit signal of the over-current in the normal operation region is true, the over-current judgment or circuit indicates that the over-current criterion of the normal operation region is met, and sends the signal meeting the over-current criterion of the normal operation region to the first or circuit.
The first or circuit is used for carrying out or calculating according to the phase current sudden increase criterion signal meeting the normal operation interval and the overcurrent criterion signal meeting the normal operation interval, if one of the phase current sudden increase criterion signal meeting the normal operation interval and the overcurrent criterion signal meeting the normal operation interval is true, the first or circuit judges that the belt conveyor is scratched to be faulty, and then the first or circuit sends a fault signal to the switching value output unit. The switching value output unit transmits a fault signal to the circuit breaker, and the circuit breaker performs a trip operation.
A motor relay protection method for protecting a belt conveyor from scratch faults comprises the following steps:
and S1, collecting three-phase current values and breaker positions when the motor is in operation. Calculating the current amplitude I of each phase in real time ph And a three-phase maximum current value I max Wherein I ph For the current real-time phase current amplitude, ph= A, B, C is the same, I max Is the maximum value of three-phase current.
Step S2, memorizing six current amplitudes at intervals of half cycle, and calculating current three cycle phase currents in front of real time at each sampling timeAverage amplitudeph= A, B, C is the same, and T represents a period.
Step S3, passing through three-phase maximum current value I max And judging whether the motor is in a light-load operation interval or a normal operation interval according to the position of the circuit breaker. If the motor is in the light load operation section, the process goes to step S4. If the motor is in the normal operation range, the process goes to step S6.
Step S4, judging whether the method meets the requirement in real timeRecording the current average amplitude ++of the current of the current three cycle phases in real time when the current is satisfied for the first time>Is memory value->Starting a timer to obtain a current surge time t1, wherein I set3 Is a phase current surge set point.
Step S5, judging whether the method meets the requirement in real timeAnd T1 > T set1 If yes, indicating that the phase current sudden increase criterion is met, jumping to step S8, wherein T set1 The phase current is increased by a delay time.
And S6, executing the normal operation interval overcurrent criterion, wherein the normal operation interval overcurrent criterion comprises a normal operation interval overcurrent current continuous overrun criterion and a normal operation interval overcurrent current overrun accumulated number of times overrun criterion.
Step S61, a current duration overrun criterion of overcurrent in a normal operation interval: judging whether the I is satisfied in real time max ＞I set4 And T2 > T set2 . If yes, meeting the current continuous overrun criterion of the overcurrent in the normal operation interval, and jumping to the step S7, wherein I set4 For setting value T of continuous out-of-limit current set2 For the set value of the current duration overrun time, t2 is the current duration overrun time, and t2 is the primary I max ＞I set4 When satisfied, starts the timing of the started timer.
Step S62, current out-of-limit accumulated number out-of-limit criterion of over-current in normal operation interval: judging whether the I is satisfied in real time max ＞I set5 ，t3<T set3 And N > N set . If yes, meeting the current out-of-limit accumulated number out-of-limit criterion of the over-current in the normal operation interval, and jumping to the step S7, wherein I set5 The current is set as the over-limit current of the accumulated number of the over-limit current, T set3 To accumulate the time window setting value, N set Set value for accumulated out-of-limit times. t3 is I max ＞I set5 A timer started after the first time is satisfied, n is I in t3 time max ＞I set5 Number of times satisfied. When N > N set Or T3 > T set3 After that, n and t3 are cleared to avoid continuous accumulation.
Step S7, a normal operation interval overcurrent criterion: if the current continuous overrun criterion of the overcurrent in the normal operation interval is met or the current overrun accumulated number overrun criterion of the overcurrent in the normal operation interval is met, the overcurrent criterion in the normal operation interval is met, and the step S8 is skipped.
And S8, meeting a light load operation interval phase current sudden increase criterion or a normal operation interval overcurrent criterion, judging that the belt conveyor is scratched and faulty, outputting the fault to a switching value output unit, and sending out automatic tripping.
Preferably: in step S3, the three-phase maximum current value I is passed max And the method for judging whether the motor is in a light load operation interval or a normal operation interval at present by the position of the circuit breaker:
if the circuit breaker of the motor is in the closed position and I set2 ＞I max ＞I set The motor is in a light load operation interval, wherein I set Is a light load current high limit value, I set The low limit value of the light load current.
If the circuit breaker of the motor is in the closed position and I max ＞I set2 The motor is in the normal operating interval.
Compared with the prior art, the invention has the following beneficial effects:
the device adopts the belt conveyor scratch protection additionally arranged on the basis of the relay protection device of the existing belt conveyor motor, detects the belt scratch fault in real time, and timely sends out an alarm or automatically trips to stop operation to prevent serious accidents. The investment is not increased, the belt is not damaged, the operation and maintenance complexity is not increased, the scratch fault rate of the belt conveyor is effectively reduced, the economic benefit of a power plant is improved, and the method has high engineering practical value.
Drawings
FIG. 1 is a block diagram of an embodiment
The device comprises a 1-alternating current quantity acquisition unit, a 2-switching value input unit, a 3-switching value output unit, a 4-processing unit, a 5-display communication unit, a 6-voltage transformer, a 7-current transformer, an 8-circuit breaker, a 9-alarm indication unit, a 10-motor and an 11-belt.
Detailed Description
The present invention is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the invention and not limiting of its scope, and various equivalent modifications to the invention will fall within the scope of the appended claims to the skilled person after reading the invention.
A motor relay protection method for protecting a belt conveyor from scratch faults is shown in figure 1, and the motor running current analysis shows that when the belt conveyor is in scratch faults, the motor running current analysis shows that the belt is characterized in that current increment mutation, recovery after current is repeatedly and instantaneously increased, and continuous current increase can occur when the belt is scratched. The motor running current is smaller in light load, the device cannot directly judge scratch faults through the current, and the judgment is carried out by adopting a current increment mutation method; the belt scratch fault during normal load can be identified through the current amplitude, and the method specifically comprises the following steps:
Step S1, three-phase current values and the position of the circuit breaker 8 when the motor 10 is operated are acquired. Calculating current amplitude per phase in real timeI ph And a three-phase maximum current value I max Wherein I ph For the current real-time phase current amplitude, ph= A, B, C is the same, I max Is the maximum value of three-phase current.
Step S2, memorizing six current amplitudes at intervals of half cycle, and calculating current average amplitudes of the current three cycle phases at each sampling timeph= A, B, C is the same, and T represents a period.
Step S3, passing through three-phase maximum current value I max And the position of the circuit breaker 8 determines whether the motor 10 is currently in a light load operation interval or a normal operation interval. If the motor 10 is in the light load operation section, the process goes to step S4. If the motor 10 is in the normal operation range, the routine proceeds to step S6.
In step S3, the three-phase maximum current value I is passed max And the breaker 8 position, is currently the motor 10 is in the light load operation interval or the normal operation interval:
if the circuit breaker 8 of the motor 10 is in the closed position and I set2 ＞I max ＞I set1 The motor 10 is in a light load operation interval, wherein I set2 Is a light load current high limit value, I set1 The low limit value of the light load current.
If the circuit breaker 8 of the motor 10 is in the closed position and I max ＞I set2 The motor 10 is in the normal operation interval.
Step S4, executing a light load operation interval phase current sudden increase criterion: judging whether or not to meet Recording the current average amplitude of the current front three cyclic wave phases in real time when the current is satisfied for the first timeIs memory value->Starting a timer to obtain a current surge time t1, wherein I set3 Is a phase current surge set point.
Step S5, executing a light load operation interval phase current sudden increase criterion: judging whether or not to meet And T1 > T set1 If yes, indicating that the phase current sudden increase criterion is met, jumping to step S8, wherein T set1 The phase current is increased by a delay time.
Step S6, executing the normal operation interval overcurrent criterion: the method comprises a current continuous overrun criterion of the overcurrent in the normal operation interval and a current overrun accumulated number overrun criterion of the overcurrent in the normal operation interval.
Step S61, a current duration overrun criterion of overcurrent in a normal operation interval: judging whether the I is satisfied in real time max ＞I set4 And T2 > T set2 . If yes, meeting the current continuous overrun criterion of the overcurrent in the normal operation interval, and jumping to the step S7, wherein I set4 For setting value T of continuous out-of-limit current set2 For the set value of the current duration overrun time, t2 is the current duration overrun time, and t2 is the primary I max ＞I set4 When satisfied, starts the timing of the started timer.
Step S62, current out-of-limit accumulated number out-of-limit criterion of over-current in normal operation interval: judging whether the I is satisfied in real time max ＞I set5 ，t3＜T set3 And N > N set . If yes, meeting the current out-of-limit accumulated number out-of-limit criterion of the over-current in the normal operation interval, and jumping to the step S7, wherein I set5 The current is set as the over-limit current of the accumulated number of the over-limit current, T set3 To accumulate the time window setting value, N set To accumulate out of limitThe number of times set value. t3 is I max ＞I set5 A timer started after the first time is satisfied, n is I in t3 time max ＞I set5 Number of times satisfied. When N > N set Or T3 > T set3 After that, n and t3 are cleared to avoid continuous accumulation.
Step S7, a normal operation interval overcurrent criterion: if the current continuous overrun criterion of the overcurrent in the normal operation interval is met or the current overrun accumulated number overrun criterion of the overcurrent in the normal operation interval is met, the overcurrent criterion in the normal operation interval is met, and the step S8 is skipped.
And S8, meeting a light load operation interval phase current sudden increase criterion or a normal operation interval overcurrent criterion, judging that the belt conveyor is scratched and faulty, outputting the fault to the switching value output unit 3, and sending out automatic tripping.
A motor overload protection device for belt feeder fish tail fault protection, as shown in fig. 1, including traffic collection unit 1, switching value input unit 2, switching value output unit 3, processing unit 4, display communication unit 5, voltage transformer 6, current transformer 7, warning suggestion unit 9, wherein:
The circuit breaker 8 is mounted on a connection wire between the power bus and the motor 10.
The voltage transformer 6 and the current transformer 7 are arranged on a connecting lead between the circuit breaker 8 and the power bus.
The receiving end of the alternating current quantity acquisition unit 1 is used for being connected with the voltage transformer 6 and the current transformer 7, and the transmitting end of the alternating current quantity acquisition unit 1 is connected with the processing unit 4. The alternating current quantity acquisition unit 1 is used for acquiring current voltage electric quantity signals output by the current transformer 7 and the voltage transformer 6 when the motor 10 in the belt conveyor runs, conditioning and converting the current voltage electric quantity signals into digital analog quantity signals, and inputting the current voltage electric quantity signals converted into the digital analog quantity signals into the processing unit 4 through an internal data bus.
The receiving end of the switching value input unit 2 is connected with the circuit breaker 8, and the transmitting end of the switching value input unit 2 is connected with the processing unit 4. The switching value input unit 2 is used for collecting a strong-current hard-wired signal of the position of the circuit breaker 8, converting the strong-current hard-wired signal into a digital state value signal through photoelectric isolation, and inputting the strong-current hard-wired signal converted into the digital state value signal into the processing unit 4 through an internal I0 bus.
The receiving end of the switching value output unit 3 is connected with the processing unit 4, and the transmitting end of the switching value output unit 3 is connected with the circuit breaker 8.
The display communication unit 5 is connected to the processing unit 4. The display communication unit 5 realizes information interaction between the device and the local user and uploading and downloading of the information. The switching value output unit 3 is used for receiving the fault digital control signal sent by the processing unit 4, so as to drive the relay in the switching value output unit 3 to be switched on or switched off, and send the switching value to the operation loop of the circuit breaker 8, thereby realizing the tripping control of the circuit breaker 8 of the motor 10. The switching value output unit 3 converts the fault digital control signal into a switching signal of the relay and sends the switching signal to the alarm prompting unit 9, so that the control of equipment such as an indicator lamp, a buzzer and the like in the on-site alarm prompting unit 9 is realized. The alarm prompting unit 9 performs alarm prompting according to the fault relay control signal.
The processing unit 4 is the core of the whole device, extracts characteristics from the alternating current electric quantity of the motor 10 collected by the alternating current quantity collection unit 1, combines the position signal of the breaker 8 input by the switching value input unit 2 to carry out auxiliary judgment, and when the belt 11 driven by the current motor 10 is distinguished to have scratch faults, acts on an external alarm 9 and a tripping circuit of the breaker 8 through the switching value output unit 3, reminds an operator to check through the alarm indication unit 9, or automatically jumps and stops the driving motor 10 of the belt conveyor through the breaker 8, thereby shortening the damage time of the belt 11 and reducing the severity of damage.
The motor running current analysis when the belt conveyor is scratched and failed finds that current increment mutation occurs when the belt is scratched, the current is recovered after repeated instant increase, the current is continuously increased and other characteristics. The motor running current is smaller in light load, the device cannot directly judge scratch faults through the current, and the judgment is carried out by adopting a current increment mutation method; the belt scratch fault under normal load can be identified through the change of the current amplitude.
Collecting three-phase current values when the motor 11 operates; calculating the current amplitude of each phase and the three-phase maximum current value in real time; judging whether the motor is in a light load operation region or a normal operation region currently through the combination of maximum current and a motor starting button; if the belt conveyor is in the light-load operation interval, identifying that the belt conveyor is in a scratch state through a phase current sudden increase criterion; if the operation is in the normal operation interval, the scratch state is identified through an overcurrent criterion. And after the judgment is finished, an alarm is sent to prompt an operator to process, or tripping is sent to shorten the damage time of the belt and reduce the severity of damage.
When the singlechip is realized, the method is loaded in the singlechip through programming to form the processing unit 4.
When the circuit is implemented, the processing unit 4 includes a current extraction module, a first three cycle phase current average amplitude extraction module, a motor running state discrimination module, a current surge discrimination module, an overcurrent discrimination module, a first or circuit, wherein: the current extraction module is respectively connected with the first three cycle phase current average amplitude extraction modules, the current running state discrimination modules, the current sudden increase discrimination modules and the over-current discrimination modules, the current running state discrimination modules are respectively connected with the first three cycle phase current average amplitude extraction modules, the current sudden increase discrimination modules and the over-current discrimination modules, and the current sudden increase discrimination modules and the over-current discrimination modules are connected with the first or circuit.
The current extraction module is used for extracting three-phase current according to the collected current. Calculating the current amplitude I of each phase in real time according to the extracted three-phase current ph And a three-phase maximum current value I max 。
The first three cycle phase current average amplitude extraction modules are used for memorizing six current amplitudes at intervals of half cycle, and obtaining current real-time first three cycle phase current average amplitudes at each sampling moment
The motor is operated The state judging module comprises a first position combining judging circuit, a first motor running state comparing circuit, a first motor running state and circuit and a second motor running state and circuit, wherein the first position combining judging circuit is used for judging whether the position of the circuit breaker 8 of the motor 10 is in a position combining state or not and sending the information that the circuit breaker 8 is in the position combining state to the first motor running state and circuit. The first motor operation state comparison circuit is used for comparing the three-phase maximum current value I max Comparing with the high limit value and the low limit value of the light load current, if the three-phase maximum current value I max And when the current is between the light load current high limit value and the light load current low limit value, outputting a first comparison signal to the first motor running state and circuit. If the three-phase maximum current value I max And if the current is larger than the light load current high limit value, outputting a second comparison signal to the second motor running state and circuit. And the first motor running state and circuit obtains a signal of the motor in a light load running interval according to the combination information and the first comparison signal, and sends the signal of the motor in the light load running interval to the current sudden increase judging module. And the second motor running state and circuit performs AND operation according to the combination information and the second comparison signal to obtain a signal that the motor is in a normal running interval, and sends the signal that the motor is in the normal running interval to the overcurrent judging module.
The current surge distinguishing module comprises a phase current surge value calculating circuit, a first current surge comparing circuit, a first current surge timer, a second current surge comparing circuit, a first timing comparing circuit and a first current surge and circuit.
The first phase current surge value calculation circuit is used for calculating the current amplitude I of each phase ph And the current average amplitude of the current phase of the current three cyclic waves in real time is subjected to difference and then is subjected to modulo obtaining a first phase current sudden increase value, the computing circuit comprises an adder and a modulo device, and each phase current amplitude I is subjected to the adder ph And the current average amplitude values of the current phases of the three waves in real time are inverted and added to realize calculation, and the calculated numerical values are subjected to modulo by a modulo sampler, so that the output is ensured to be a positive value.
The first current step-up comparator circuit is used for setting a first phase current step-up value and a phase current step-up valueComparing the constant values, if the first phase current sudden increase value is larger than the phase current sudden increase set value, averaging the current average amplitude values of the current three cycle phases in real time when the current is initially satisfiedIs memory value->And simultaneously starting a first current surge timer to count so as to obtain a current surge timer t1.
The second phase current surge value calculation circuit is used for calculating the current amplitude I of each phase ph And a memory valueAnd taking a mode after the difference to obtain the second-phase current surge value.
The second current sudden increase comparison circuit compares the second phase current sudden increase value with a phase current sudden increase set value, and if the second phase current sudden increase value is larger than the phase current sudden increase set value, a current sudden increase comparison signal is obtained and is sent to the first current sudden increase and circuit.
The first timing comparison circuit is used for comparing the current surge time t1 with the phase current surge delay time, and if the current surge time t1 is larger than the phase current surge delay time, a current surge delay signal is sent to the first current surge and circuit.
And the first current sudden increase and circuit is used for performing AND operation according to the current sudden increase comparison signal and the current sudden increase delay signal, and if the current sudden increase comparison signal and the current sudden increase delay signal are true at the same time, the phase current sudden increase criterion is met, and the phase current sudden increase criterion signal meeting the light load operation interval is sent to the first or circuit.
The overcurrent judging module comprises a starting judging sub-module, a current continuous overrun judging sub-module, a current overrun accumulated times overrun judging sub-module and an overcurrent judging or circuit
The starting judging sub-module starts the current continuous overrun judging sub-module, the current overrun accumulated times overrun judging sub-module and the overcurrent judging or circuit according to the normal operation interval signal sent by the motor operation state judging module.
The current duration overrun judging submodule comprises a current duration overrun comparing circuit, a current duration overrun timer and a current duration overrun comparing circuit,
the current continuous overrun comparison circuit is used for comparing three-phase maximum current value I max Comparing with the set value of the continuous out-of-limit current, if the three-phase maximum current value I max When the current is larger than the current continuous overrun current set value, starting the current continuous overrun timer to count so as to obtain the current continuous overrun timer t2.
The current duration overrun comparison circuit is used for comparing the current duration overrun time t2 with a current duration overrun time set value, if the current duration overrun time t2 is larger than the current duration overrun time set value, the current duration overrun criterion of the overcurrent in the normal operation interval is met, and a current duration overrun signal of the overcurrent in the normal operation interval is sent to the overcurrent judgment or circuit.
The current out-of-limit accumulated time out-of-limit judging submodule comprises a current out-of-limit accumulated time comparison circuit, a current out-of-limit accumulated time timer, a first current out-of-limit accumulated time comparison circuit, a second current out-of-limit accumulated time comparison circuit and a current out-of-limit accumulated time and circuit.
The current out-of-limit cumulative frequency comparison circuit is used for comparing the three-phase maximum current value I max Comparing with the over-limit current set value of the current over-limit accumulated times, if the three-phase maximum current value I max When the current threshold value is larger than the current threshold value, starting the current threshold value timer to count the current threshold value timer to obtain the current threshold value timer t3, and counting the three-phase maximum current value I max Is greater than the current threshold value n of the current threshold value.
The first current out-of-limit accumulated time comparing circuit is used for comparing the current out-of-limit accumulated time timing t3 with an accumulated time window set value, and if the current out-of-limit accumulated time timing t3 is smaller than the accumulated time window set value, the first current out-of-limit accumulated time comparing circuit sends a current out-of-limit accumulated time timing smaller than a signal to the current out-of-limit accumulated time and circuit.
The second current out-of-limit cumulative frequency comparison circuit is used for three-phase maximum current value I max Comparing the number n of over-limit current set values greater than the accumulated number of over-limit current with the set value of accumulated over-limit current set value, if the three-phase maximum current value I max The number n of the over-limit current set values which is larger than the current over-limit accumulated number is larger than the accumulated time window set value accumulated over-limit number set value, and the over-limit accumulated number of the current is larger than the signal to the over-limit accumulated number and circuit.
And the current out-of-limit accumulated time and circuit performs AND calculation according to the fact that the current out-of-limit accumulated time count is smaller than the signal and the current out-of-limit accumulated time count is larger than the signal, if the current out-of-limit accumulated time count is smaller than the signal and the current out-of-limit accumulated time count is larger than the signal and is true at the same time, the current out-of-limit accumulated time count out-of-limit criterion of the over-current in the normal operation interval is met, and the over-current out-of-limit accumulated time count out-of-limit signal of the over-current in the normal operation interval is sent to the over-current judgment or circuit.
The over-current judgment or circuit performs or calculates according to the current continuous over-limit signal of the over-current in the normal operation region and the current out-of-limit accumulated number of times out-of-limit signal of the over-current in the normal operation region, and if one of the current continuous over-limit signal of the over-current in the normal operation region and the current out-of-limit accumulated number of times out-of-limit signal of the over-current in the normal operation region is true, the over-current judgment or circuit indicates that the over-current criterion of the normal operation region is met, and sends the signal meeting the over-current criterion of the normal operation region to the first or circuit.
The first or circuit is used for carrying out or calculating according to the phase current sudden increase criterion signal meeting the light load operation interval and the overcurrent criterion signal meeting the normal operation interval, if one of the phase current sudden increase criterion signal meeting the light load operation interval and the overcurrent criterion signal meeting the normal operation interval is true, the first or circuit judges that the belt conveyor is scratched to be faulty, and the first or circuit sends a fault signal to the switching value output unit 3. The switching value output unit 3 transmits a fault signal to the circuit breaker 8, and the circuit breaker 8 performs a trip operation.
The device detects the belt scratch fault in real time, and gives an alarm or automatically trips in time to prevent the accident from being serious. The investment is not increased, the belt is not damaged, the operation and maintenance complexity is not increased, the scratch fault rate of the belt conveyor is effectively reduced, the economic benefit of a power plant is improved, and the method has high engineering practical value.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (8)
1. The utility model provides a motor overload protection device for belt feeder fish tail fault protection, its characterized in that includes traffic collection unit (1), switching value input unit (2), switching value output unit (3), processing unit (4) and current transformer (7), wherein:
the current transformer (7) is used for being arranged on a connecting wire between a breaker (8) of the motor (10) and the power bus;
the receiving end of the alternating current quantity acquisition unit (1) is used for being connected with the current transformer (7), and the transmitting end of the alternating current quantity acquisition unit (1) is connected with the processing unit (4);
The receiving end of the switching value input unit (2) is connected with the circuit breaker (8), and the transmitting end of the switching value input unit (2) is connected with the processing unit (4);
the receiving end of the switching value output unit (3) is connected with the processing unit (4), and the transmitting end of the switching value output unit (3) is connected with the circuit breaker (8);
the processing unit (4) comprises a current extraction module, a first three cycle phase current average amplitude extraction module, a motor running state discrimination module, a current surge discrimination module, an overcurrent discrimination module and a first or circuit, wherein: the current extraction module is respectively connected with the first three cycle phase current average amplitude extraction modules, the current operation state discrimination modules, the current sudden increase discrimination modules and the overcurrent discrimination modules, the current operation state discrimination modules are respectively connected with the first three cycle phase current average amplitude extraction modules, the current sudden increase discrimination modules and the overcurrent discrimination modules, and the current sudden increase discrimination modules and the overcurrent discrimination modules are connected with the first or circuit;
the current sudden increase judging module comprises a starting sudden increase submodule, a phase current sudden increase value calculating circuit, a first current sudden increase comparing circuit, a first current sudden increase timer, a second current sudden increase comparing circuit, a first timing comparing circuit and a first current sudden increase and circuit;
The starting sudden increase sub-module starts a phase current sudden increase value calculation circuit, a first current sudden increase comparison circuit, a first current sudden increase timer, a second current sudden increase comparison circuit, a first timing comparison circuit and a first current sudden increase and circuit according to the light load operation interval signal sent by the motor operation state judging module;
the first phase current surge value calculation circuit is used for calculating the current amplitude I of each phase ph And the current average amplitude of the current front three cyclic wave phases in real time is subjected to difference and then is subjected to modulus taking to obtain the first phase current surge value,
the first current surge comparison circuit is used for comparing the first phase current surge value with a phase current surge set value, and if the first phase current surge value is larger than the phase current surge set value, the current real-time front three cycle phase current average amplitude values in the initial meeting process are obtainedIs memory value->Simultaneously starting a first current surge timer to count so as to obtain a current surge timer t1;
the second phase current surge value calculating circuit is used for calculating the current amplitude I of each phase ph And a memory valueTaking a mode after difference to obtain a second phase current surge value;
the second current sudden increase comparison circuit compares the second phase current sudden increase value with a phase current sudden increase set value, and if the second phase current sudden increase value is larger than the phase current sudden increase set value, a current sudden increase comparison signal is obtained and is sent to the first current sudden increase and circuit;
The first timing comparison circuit is used for comparing the current surge time t1 with the phase current surge delay time, and if the current surge time t1 is greater than the phase current surge delay time, a current surge delay signal is sent to the first current surge and circuit;
the first current sudden increase and circuit is used for performing AND operation according to the current sudden increase comparison signal and the current sudden increase delay signal, if the current sudden increase comparison signal and the current sudden increase delay signal are true at the same time, the phase current sudden increase criterion is met, and the phase current sudden increase criterion signal meeting the light load operation interval is sent to the first or circuit;
the overcurrent judging module comprises a starting judging sub-module, a current continuous overrun judging sub-module, a current overrun accumulated times overrun judging sub-module and an overcurrent judging or circuit
The starting judging sub-module starts the current continuous overrun judging sub-module, the current overrun accumulated times overrun judging sub-module and the overcurrent judging or circuit according to the normal operation interval signal sent by the motor operation state judging module;
the current duration overrun judging submodule comprises a current duration overrun comparing circuit, a current duration overrun timer and a current duration overrun comparing circuit,
The current continuous overrun comparison circuit is used for comparing three-phase maximum current value I max Comparing with the set value of the continuous out-of-limit current, if the three-phase maximum current value I max When the current is larger than the current continuous overrun current set value, starting the current continuous overrun timer to count so as to obtain a current continuous overrun timer t2;
the current duration overrun comparison circuit is used for comparing the current duration overrun time t2 with a current duration overrun time set value, if the current duration overrun time t2 is larger than the current duration overrun time set value, the current duration overrun criterion of the overcurrent in the normal operation interval is met, and a current duration overrun signal of the overcurrent in the normal operation interval is sent to the overcurrent judgment or circuit;
the current out-of-limit accumulated time out-of-limit judging submodule comprises a current out-of-limit accumulated time comparison circuit, a current out-of-limit accumulated time timer, a first current out-of-limit accumulated time comparison circuit, a second current out-of-limit accumulated time comparison circuit and a current out-of-limit accumulated time and circuit;
the current out-of-limit cumulative frequency comparison circuit is used for comparing the three-phase maximum current value I max Comparing with the over-limit current set value of the current over-limit accumulated times, if the three-phase maximum current value I max When the current threshold value is larger than the current threshold value, starting the current threshold value timer to count the current threshold value timer to obtain the current threshold value timer t3, and counting the three-phase maximum current value I max The current set value times n is larger than the current overrun accumulated times;
the first current out-of-limit accumulated time comparing circuit is used for comparing the current out-of-limit accumulated time timing t3 with an accumulated time window set value, and if the current out-of-limit accumulated time timing t3 is smaller than the accumulated time window set value, the first current out-of-limit accumulated time comparing circuit sends a signal to the current out-of-limit accumulated time and the circuit;
the second current out-of-limit cumulative frequency comparison circuit is used for three-phase maximum current value I max Comparing the number n of over-limit current set values greater than the accumulated number of over-limit current with the set value of accumulated over-limit current set value, if the three-phase maximum current value I max The current set value frequency n which is larger than the current out-of-limit accumulated frequency is larger than the accumulated time window set value accumulated out-of-limit frequency set value, and the current out-of-limit accumulated frequency is larger than the signal to the current out-of-limit accumulated frequency and circuit;
the current out-of-limit accumulated time and circuit counts and calculates according to the fact that the current out-of-limit accumulated time is smaller than the signal and the current out-of-limit accumulated time is larger than the signal, if the current out-of-limit accumulated time is smaller than the signal and the current out-of-limit accumulated time is larger than the signal and is true at the same time, the current out-of-limit accumulated time out-of-limit criterion of the over-current in the normal operation interval is met, and the over-current out-of-limit accumulated time out-of-limit signal of the over-current in the normal operation interval is sent to the over-current judgment or circuit;
The over-current judgment or circuit performs or calculates according to the current continuous over-limit signal of the over-current in the normal operation region and the current out-of-limit accumulated number of times out-of-limit signal of the over-current in the normal operation region, and if one of the current continuous over-limit signal of the over-current in the normal operation region and the current out-of-limit accumulated number of times out-of-limit signal of the over-current in the normal operation region is true, the over-current judgment or circuit indicates that the over-current criterion of the normal operation region is met, and sends the signal meeting the over-current criterion of the normal operation region to the first or circuit;
the first or circuit is used for carrying out or calculating according to the phase current sudden increase criterion signal meeting the light load operation interval and the overcurrent criterion signal meeting the normal operation interval, if one of the phase current sudden increase criterion signal meeting the phase current sudden increase criterion signal and the overcurrent criterion signal meeting the normal operation interval is true, the first or circuit judges that the belt conveyor is scratched to be faulty, and the first or circuit sends a fault signal to the switching value output unit (3); the switching value output unit (3) transmits a fault signal to the circuit breaker (8), and the circuit breaker (8) performs a trip operation.
2. The motor relay protection device for belt conveyor scratch fault protection of claim 1, wherein: the intelligent power supply device comprises a voltage transformer (6), wherein the voltage transformer (6) is arranged on a connecting wire between a circuit breaker (8) and a power bus, and a receiving end of an alternating current quantity acquisition unit (1) is used for being connected with the voltage transformer (6).
3. The motor relay protection device for belt conveyor scratch fault protection of claim 2, wherein: comprises a display communication unit (5), wherein the display communication unit (5) is connected with a processing unit (4).
4. The motor relay protection device for belt conveyor scratch fault protection of claim 3, wherein: the intelligent alarm device comprises an alarm prompting unit (9), wherein the alarm prompting unit (9) is connected with a switching value output unit (3).
5. The motor relay protection device for belt conveyor scratch fault protection of claim 4, wherein: the processing unit (4) is a singlechip.
6. The motor relay protection device for belt conveyor scratch fault protection of claim 4, wherein: the current extraction module is used for extracting three-phase current according to the collected current quantity; calculating the current amplitude I of each phase in real time according to the extracted three-phase current ph And a three-phase maximum current value I max ；
The first three cycle phase current average amplitude extraction modules are used for memorizing six current amplitudes at intervals of half cycle, and obtaining current real-time first three cycle phase current average amplitudes at each sampling moment
The motor running state judging module comprises a first position combining judging circuit, a first motor running state comparing circuit, a first motor running state and circuit and a second motor running state and circuit, wherein the first position combining judging circuit is used for judging whether the position of a circuit breaker (8) of the motor (10) is in a position combining state or not and sending information that the circuit breaker (8) is in the position combining state to the first motor running state and circuit; the first motor operation state comparison circuit is used for comparing the three-phase maximum current value I max Comparing with the high limit value and the low limit value of the light load current, if the three-phase maximum current value I max When the current is between the light load current high limit value and the light load current low limit value, outputting a first comparison signal to a first motor running state and circuit; if the three-phase maximum current value I max If the current is larger than the light load current high limit value, outputting a second comparison signal to a second motor running state and circuit; the first motor running state and circuit obtains a signal of the motor in a light load running interval according to the combination information and the first comparison signal, and sends the signal of the motor in the light load running interval to the current sudden increase judging module; the second motor running state and the circuit are combined according to the combinationAnd performing AND operation on the bit information and the second comparison signal to obtain a signal that the motor is in a normal operation interval, and sending the signal that the motor is in the normal operation interval to the overcurrent judging module.
7. A motor relay protection method for protecting a belt conveyor from scratch fault is characterized by comprising the following steps:
step S1, collecting three-phase current values and the position of a circuit breaker (8) when a motor (10) operates; calculating the current amplitude I of each phase in real time ph And a three-phase maximum current value I max Wherein I ph For the current real-time phase current amplitude, ph= A, B, C is the same, I max Is the maximum value of three-phase current;
step S2, memorizing six current amplitudes at intervals of half cycle, and calculating current average amplitudes of the current three cycle phases at each sampling timeph= A, B, C is the same, T represents a period;
step S3, passing through three-phase maximum current value I max And the position of the breaker (8) judges whether the motor (10) is in a light load operation area or a normal operation area at present; if the motor (10) is in the light load operation interval, jumping to the step S4 for carrying out; if the motor (10) is in the normal operation interval, jumping to the step S6;
step S4, judging whether the method meets the requirement in real timeRecording the current average amplitude ++of the current of the current three cycle phases in real time when the current is satisfied for the first time>Is memory value->Starting a timer to obtain a current surge time t1, wherein I set3 A phase current surge set value;
Step S5, judging whether the method meets the requirement in real timeAnd t1>T set1 If yes, indicating that the phase current sudden increase criterion is met, jumping to step S8, wherein T set1 The phase current is suddenly increased by a delay time;
step S6, executing a normal operation interval overcurrent criterion, wherein the normal operation interval overcurrent criterion comprises a normal operation interval overcurrent current continuous overrun criterion and a normal operation interval overcurrent current overrun accumulated number of times overrun criterion;
step S61, a current duration overrun criterion of overcurrent in a normal operation interval: judging whether the I is satisfied in real time max >I set4 And t2>T set2 The method comprises the steps of carrying out a first treatment on the surface of the If yes, meeting the current continuous overrun criterion of the overcurrent in the normal operation interval, and jumping to the step S7, wherein I set4 For setting value T of continuous out-of-limit current set2 For the set value of the current duration overrun time, t2 is the current duration overrun time, and t2 is the primary I max >I set4 Starting to start the timing of the timer after being satisfied;
step S62, current out-of-limit accumulated number out-of-limit criterion of over-current in normal operation interval: judging whether the I is satisfied in real time max >I set5 ，t3<T set3 And n>N set The method comprises the steps of carrying out a first treatment on the surface of the If yes, meeting the current out-of-limit accumulated number out-of-limit criterion of the over-current in the normal operation interval, and jumping to the step S7, wherein I set5 The current is set as the over-limit current of the accumulated number of the over-limit current, T set3 To accumulate the time window setting value, N set Setting a value for the accumulated out-of-limit times; t3 is I max >I set5 A timer started after the first time is satisfied, n is I in t3 time max >I set5 Number of times satisfied; when n is>N set Or t3>T set3 After that, n and t3 are cleared to avoid continuous accumulation;
step S7, a normal operation interval overcurrent criterion: if the current continuous overrun criterion of the overcurrent in the normal operation interval is met or the current overrun accumulated number overrun criterion of the overcurrent in the normal operation interval is met, the overcurrent criterion in the normal operation interval is met, and the step S8 is skipped;
and S8, meeting a light load operation interval phase current sudden increase criterion or a normal operation interval overcurrent criterion, judging that the belt conveyor is scratched and faulty, outputting the fault to a switching value output unit (3), and sending out automatic tripping.
8. The motor relay protection method for protecting the scratch fault of the belt conveyor according to claim 7, wherein the motor relay protection method is characterized by comprising the following steps of: in step S3, the three-phase maximum current value I is passed max And the method for judging whether the motor (10) is in the light load operation interval or the normal operation interval at present according to the position of the breaker (8):
if the circuit breaker (8) of the motor (10) is in the closed position and I set2 >I max >I set1 The motor (10) is in a light load operation interval, wherein I set2 Is a light load current high limit value, I set1 The low limit value of the light load current is set;
If the circuit breaker (8) of the motor (10) is in the closed position and I max >I set2 The motor (10) is in a normal operating interval.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111484854.8A CN114583660B (en) | 2021-12-07 | 2021-12-07 | Motor relay protection device and method for belt conveyor scratch fault protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111484854.8A CN114583660B (en) | 2021-12-07 | 2021-12-07 | Motor relay protection device and method for belt conveyor scratch fault protection |
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| Publication Number | Publication Date |
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| CN114583660A CN114583660A (en) | 2022-06-03 |
| CN114583660B true CN114583660B (en) | 2023-12-26 |
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| CN202111484854.8A Active CN114583660B (en) | 2021-12-07 | 2021-12-07 | Motor relay protection device and method for belt conveyor scratch fault protection |
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| CN101257268A (en) * | 2007-12-22 | 2008-09-03 | 安徽鑫龙电器股份有限公司 | Electric motor controller and control method |
| CN201270410Y (en) * | 2008-09-12 | 2009-07-08 | 南京因泰莱电器股份有限公司 | Motor protecting controller |
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| CN103941114A (en) * | 2014-01-22 | 2014-07-23 | 上海大郡动力控制技术有限公司 | Self-detection method for power module and current sensors of vehicle-used permanent-magnet synchronous motor system |
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| CN108134374A (en) * | 2017-11-30 | 2018-06-08 | 中国神华能源股份有限公司 | For determination method, medium, the electronic equipment of the belt slippage reason of power shovel |
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| CN114583660A (en) | 2022-06-03 |
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