CN113765062A - Motor fault diagnosis and protection control system - Google Patents
Motor fault diagnosis and protection control system Download PDFInfo
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- CN113765062A CN113765062A CN202010488538.7A CN202010488538A CN113765062A CN 113765062 A CN113765062 A CN 113765062A CN 202010488538 A CN202010488538 A CN 202010488538A CN 113765062 A CN113765062 A CN 113765062A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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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
- H02H7/0822—Integrated protection, motor control centres
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- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a motor fault diagnosis and protection control system, which comprises a remote terminal in communication connection with near field equipment; the near field equipment comprises a data acquisition unit, an A/D sampling unit and an execution circuit breaker; the remote terminal comprises an analysis unit; the data acquisition unit is used for acquiring working condition signals of the motor; the A/D sampling unit is used for converting each working condition signal into a corresponding digital working condition signal; the analysis unit is used for generating alarm information and/or control instructions according to preset rules by taking the digital working condition signals as parameters, and generating corresponding fault reports according to the digital working condition signals when the alarm information and/or the control instructions are generated; and the execution circuit breaker is used for controlling the on-off of the power supply of the motor according to the control instruction. The invention realizes the integrated design of state monitoring, fault diagnosis and protection control of the motor, can effectively improve the precision of fault diagnosis and protection control of the motor, and reduces the comprehensive cost of fault diagnosis and protection control.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a motor fault diagnosis and protection control system.
Background
The motors in the manufacturing enterprises can comprise large motors with the capacity of 2MW and above and 6kV, and the motors usually bear important process production flows, so that the safety and the reliability of the motors are very important. Because such motors are often in harsh environments such as high temperature, high pressure, strong corrosion and the like for a long time, not only an accurate state monitoring and fault diagnosis device is needed, but also an accurate protection control device is needed to meet the requirements of safe production.
In the prior art, two sets of devices for fault detection and protection control of a large motor are independent of each other, that is, a fault diagnosis device and a protection control device need to be installed respectively to realize fault detection and protection control of the large motor.
The inventor finds that the technical scheme in the prior art not only has higher comprehensive cost, but also has unsatisfactory fault detection and protection control effects through research.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to reduce the comprehensive cost of fault detection and protection control of a motor.
The invention provides a motor fault diagnosis and protection control system, which comprises a remote terminal in communication connection with near field equipment; the near field equipment comprises a data acquisition unit, an A/D sampling unit and an execution circuit breaker; the remote terminal comprises an analysis unit;
the data acquisition unit is used for acquiring working condition signals including high-frequency partial discharge signals, current signals, voltage signals, temperature signals and vibration signals of the motor;
the A/D sampling unit is used for converting each working condition signal into a corresponding digital working condition signal;
the analysis unit is used for generating alarm information and/or control instructions according to preset rules by taking the digital working condition signals as parameters, and generating corresponding fault reports according to the digital working condition signals when the alarm information and/or the control instructions are generated;
and the execution circuit breaker is used for controlling the on-off of the power supply of the motor according to the control instruction.
In the present invention, the data acquisition unit includes:
a high frequency current sensor for gathering high frequency partial discharge signal is in the three-phase inlet wire of motor.
In the present invention, the data acquisition unit includes:
and the current sensor and the voltage sensor for acquiring the current signal and the voltage signal are buckled on the three-phase inlet wire of the motor.
In the present invention, the data acquisition unit includes:
the built-in temperature sensor for collecting temperature signals is embedded in a three-phase winding of the motor and is tightly attached to the three-phase winding.
In the present invention, the data acquisition unit includes:
the vibration sensor for collecting vibration signals comprises one of an eddy current sensor, a speed sensor, an acceleration sensor or a composite sensor and any combination thereof.
In the present invention, the preset rule includes:
respectively presetting a numerical range and/or a threshold value corresponding to each digital working condition signal; the numerical range is the numerical range of each digital working condition signal when the motor is in a normal running state.
In the present invention, the determination process set in the preset rule includes:
judging whether the current exceeds a quick-break fixed value, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the current exceeds the overload duration fixed value for a long time, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether a single-phase earth fault occurs, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the three-phase voltage is lower than the undervoltage fixed value, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the temperature exceeds a temperature tripping fixed value, if so, generating a control instruction for executing tripping of the circuit breaker, otherwise,
judging whether the temperature exceeds a temperature alarm fixed value, if so, sending out alarm information, otherwise,
judging whether the vibration exceeds a vibration trip fixed value, if so, generating a control instruction for executing the trip of the circuit breaker, otherwise,
judging whether the vibration exceeds a vibration alarm fixed value, if so, sending out alarm information, otherwise,
performing fast Fourier transform on the three-phase voltage and current signals, judging whether the harmonic voltage and current exceed a voltage and current trip fixed value, if so, generating a control instruction for executing the trip of the circuit breaker, otherwise,
judging whether the harmonic voltage and current exceed the voltage and current alarm constant value, if yes, sending out alarm information, otherwise,
judging whether the partial discharge signal exceeds the tripping fixed value of the electric signal, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
and judging whether the partial discharge signal exceeds a partial discharge alarm fixed value, and if so, sending alarm information.
In the present invention, the generating of the corresponding fault report according to the digital working condition signal when the alarm information and/or the control instruction are generated includes:
and constructing a fault type judgment model by taking the historical data of the digital working condition signal when the alarm information and/or the control instruction are generated as independent variables and the historical data of the actual fault type as dependent variables.
In the present invention, the method further comprises:
the temperature pre-judging unit is used for pre-judging a temperature predicted value of a preset time point according to a temperature change trend in a past preset time period by taking a current time point as a reference; the preset time point is a time point after a preset time after the current time point;
and generating the fault risk of the preset time point according to the fault type judgment model by taking the temperature predicted value as input.
In the present invention, the method further comprises:
the vibration pre-judging unit is used for pre-judging a vibration predicted value of a preset time point according to a vibration change trend in a past preset time period by taking the current time point as a reference;
the input of the fault type judgment model for generating the fault risk at the preset time point further comprises the vibration prediction value.
Compared with the prior art, the invention has the following beneficial effects:
in the prior art, the fault diagnosis device and the protection control device which are respectively and independently arranged need to be respectively provided with respective signal data acquisition devices, and the types of the parameters according to which the judgment results are determined are often single; therefore, not only is the comprehensive cost higher, but also good fault diagnosis and protection control effects cannot be obtained; for example, protection control in the prior art often only collects voltage and current signals as a judgment basis, which easily causes malfunction and operation rejection.
The inventor finds that for the motor, working condition signals such as temperature, vibration, voltage, current, high-frequency partial discharge signals and the like monitored in real time during state monitoring and fault diagnosis can also provide auxiliary reference for protection control so as to improve the effect of the protection control; therefore, only one set of data acquisition unit consisting of a high-frequency current sensor, a voltage sensor, a temperature sensor and a vibration sensor is arranged in the invention; each sensor in the data acquisition unit can acquire working condition signals such as current signals, voltage signals, temperature signals, vibration signals and the like of the motor in real time; the working condition signals collected by the data collecting unit are sent to a remote terminal through communication means such as a network; the analysis unit of the remote terminal generates alarm information and a control instruction to realize system protection, and then the remote terminal can feed the control instruction back to the execution circuit breaker and display alarm information through a human-computer interaction interface.
In addition, the analysis unit in the invention can further generate a corresponding fault report according to the digital working condition signal when the alarm information and/or the control instruction are generated, thereby judging the fault type of the motor.
The invention realizes the integrated design of state monitoring, fault diagnosis and protection control of the motor, can effectively improve the precision of fault diagnosis and protection control of the motor, and reduces the comprehensive cost of fault diagnosis and protection control.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means implementable in accordance with the contents of the description, and to make the above and other objects, technical features, and advantages of the present invention more comprehensible, one or more preferred embodiments are described below in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a motor fault diagnosis and protection control system according to the present invention;
fig. 2 is a schematic flow chart of the determination process in the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
Example one
In order to improve the accuracy of motor fault diagnosis and protection control and reduce the comprehensive cost of fault diagnosis and protection control, as shown in fig. 1, in the embodiment of the present invention, a motor fault diagnosis and protection control system is provided, which includes a remote terminal 02 communicatively connected to a near field device 01; the near field equipment comprises a data acquisition unit 11, an A/D sampling unit 12 and an execution circuit breaker 13; the remote terminal 02 includes an analysis unit 21;
the data acquisition unit 11 is used for acquiring working condition signals including a high-frequency partial discharge signal, a current signal, a voltage signal, a temperature signal and a vibration signal of the motor 03;
the A/D sampling unit 12 is used for converting each working condition signal into a corresponding digital working condition signal;
the analysis unit 21 is configured to generate an alarm message and/or a control instruction according to a preset rule by using the digital working condition signal as a parameter, and generate a corresponding fault report according to the digital working condition signal when the alarm message and/or the control instruction is generated;
the execution breaker 13 is used for controlling the on/off of the power source 04 of the motor 03 according to a control command.
In practical applications, the data acquisition unit 11 may include a high-frequency current sensor 111, a current sensor 112, a voltage sensor, a 113 temperature sensor 114, a vibration sensor 115, and the like, and may perform omnibearing state evaluation on the motor 03 by monitoring various working condition signals of the motor 03 in real time, specifically, the data acquisition unit 11 includes:
a high-frequency current sensor 111 for collecting high-frequency partial discharge signals is fastened on a three-phase incoming line of the motor 03; thus, the partial discharge signal of the motor 03 can be accurately acquired.
A current sensor 112 and a voltage sensor 113 for acquiring current signals and voltage signals are fastened on a three-phase incoming line of the motor 03; therefore, current signals and voltage signals with the bandwidth of 50 Hz-1 kHz (20 times of power frequency) can be accurately acquired.
The built-in temperature sensor 114 for acquiring temperature signals is embedded in the three-phase winding of the motor 03 and is closely attached to the three-phase winding, and preferably, the type of the temperature sensor 114 can be a Pt100 platinum thermistor.
The vibration sensor 115 for collecting the vibration signal may be an eddy current sensor, a speed sensor, an acceleration sensor or a composite sensor, and in practical applications, may be adaptively selected according to the field installation condition of the detected motor 03.
Then, the a/D sampling unit 12 can convert the operating condition signals collected by the sensors in the data collecting unit 11 into corresponding digital operating condition signals, so as to facilitate data communication and subsequent data analysis.
In the embodiment of the invention, the remote terminal 02 can acquire the digital working condition signal of the motor 03 in real time; the analysis unit in the remote terminal can be a software program to generate alarm information and/or a control instruction through the digital working condition signal, and generate a corresponding fault report according to the digital working condition signal when the alarm information and/or the control instruction are generated.
In the analyzing unit 21, a preset rule is included to determine whether the running state of the motor 03 is normal, wherein the preset rule includes respectively presetting a numerical range and/or a threshold corresponding to each digital working condition signal; the range of values is the range of values of various digital working condition signals when the motor 03 is in a normal operation state, and in practical application, the range of values may include:
the quick-break constant value is used for judging whether the current exceeds the quick-break constant value;
the overload duration fixed value is used for judging whether the time that the current exceeds the overload fixed value is overlong;
the undervoltage definite value is used for judging whether the three-phase voltage of the power failure is lower than the undervoltage definite value;
the temperature trip fixed value is used for judging whether the temperature exceeds the temperature trip fixed value;
the temperature alarm constant value is used for judging whether the temperature exceeds the temperature alarm constant value or not;
the vibration trip fixed value is used for judging whether the vibration exceeds the vibration trip fixed value;
the vibration alarm fixed value is used for judging whether the vibration exceeds the vibration alarm fixed value;
the voltage current tripping fixed value is used for judging whether the harmonic voltage current exceeds the voltage current tripping fixed value;
the voltage and current alarm constant value is used for judging whether the harmonic voltage and current exceed the voltage and current alarm constant value;
the electric signal tripping fixed value is used for judging whether the partial discharge signal exceeds the electric signal tripping fixed value or not;
and the partial discharge alarm fixed value is used for judging whether the partial discharge signal exceeds the partial discharge alarm fixed value.
After the value range and/or the threshold corresponding to each digital operating condition signal is preset, corresponding alarm information and a control instruction may be generated according to various real-time digital operating condition signals through a specific determination process, as shown in fig. 2, the determination process in the embodiment of the present invention may specifically include:
judging whether the current exceeds a quick-break fixed value, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the current exceeds the overload duration fixed value for a long time, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether a single-phase earth fault occurs, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the three-phase voltage is lower than the undervoltage fixed value, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the temperature exceeds a temperature tripping fixed value, if so, generating a control instruction for executing tripping of the circuit breaker, otherwise,
judging whether the temperature exceeds a temperature alarm fixed value, if so, sending out alarm information, otherwise,
judging whether the vibration exceeds a vibration trip fixed value, if so, generating a control instruction for executing the trip of the circuit breaker, otherwise,
judging whether the vibration exceeds a vibration alarm fixed value, if so, sending out alarm information, otherwise,
performing fast Fourier transform on the three-phase voltage and current signals, judging whether the harmonic voltage and current exceed a voltage and current trip fixed value, if so, generating a control instruction for executing the trip of the circuit breaker, otherwise,
judging whether the harmonic voltage and current exceed the voltage and current alarm constant value, if yes, sending out alarm information, otherwise,
judging whether the partial discharge signal exceeds the tripping fixed value of the electric signal, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
and judging whether the partial discharge signal exceeds a partial discharge alarm fixed value, and if so, sending alarm information.
The embodiment of the invention realizes the omnibearing monitoring and protection control on the abnormity of the motor 03 by utilizing various working condition signals and carrying out corresponding priority setting on various factors causing the abnormity of the motor 03, and the generation mechanism for controlling and executing the control instruction of the circuit breaker 13 is more reasonable, thereby effectively reducing the occurrence of misoperation and operation failure.
In the embodiment of the present invention, the analyzing unit 21 of the present invention may further generate a corresponding fault report according to the digital working condition signal when the alarm information and/or the control instruction is generated, so as to determine the fault type of the motor 03, which specifically includes:
and (3) constructing a fault type judgment model by taking historical data of the digital working condition signal when the alarm information and/or the control instruction is generated as an independent variable and actual historical data of the fault type as a dependent variable.
In practical application, a database may be provided at one side of the remote terminal 02 to store digital operating condition signals generated according to the data collected by the data collecting unit 11, and fault information including actual faults of fault types is recorded in the database, so as to obtain a large amount of historical data of the digital operating condition signals and the fault information; then, historical data of the digital working condition signals when the alarm information and/or the control instruction are generated are used as independent variables, and historical data of actual fault types are used as dependent variables, and a fault type judgment model is constructed through model training; therefore, the fault type of the current fault can be analyzed by using the digital working condition signal when the alarm information and/or the control instruction is generated as input through the fault type judgment model.
In summary, the embodiment of the invention is only provided with a set of data acquisition unit consisting of a high-frequency current sensor, a voltage sensor, a temperature sensor and a vibration sensor; each sensor in the data acquisition unit can acquire working condition signals such as current signals, voltage signals, temperature signals, vibration signals and the like of the motor in real time; the working condition signals collected by the data collecting unit are sent to a remote terminal through communication means such as a network; the analysis unit of the remote terminal generates alarm information and a control instruction to realize system protection, and then the remote terminal can feed the control instruction back to the execution circuit breaker and display alarm information through a human-computer interaction interface.
In addition, the analysis unit in the invention can further generate a corresponding fault report according to the digital working condition signal when the alarm information and/or the control instruction are generated, thereby judging the fault type of the motor.
The invention realizes the integrated design of state monitoring, fault diagnosis and protection control of the motor, can effectively improve the precision of fault diagnosis and protection control of the motor, and reduces the comprehensive cost of fault diagnosis and protection control.
Further, in the embodiment of the present invention, the fault type determination module may be further used to pre-determine the fault risk of the motor, and in practical application, a temperature signal and/or a vibration signal having a certain regularity in a development trend in a working condition signal may be used as a pre-determination basis, specifically:
the temperature pre-judging unit is used for pre-judging a temperature predicted value of a preset time point according to a temperature change trend in a past preset time period by taking a current time point as a reference; the preset time point is a time point after a preset time after the current time point;
and generating the fault risk of the preset time point according to the fault type judgment model by taking the temperature predicted value as input.
In addition, the embodiment of the invention may further include a vibration pre-judging unit, configured to pre-judge a vibration prediction value of a preset time point according to a vibration variation trend within a past preset time period with the current time point as a reference;
the input of the fault type judgment model for generating the fault risk at the preset time point further comprises the vibration prediction value.
When the motor is judged to have the risk of temperature exceeding (exceeding a temperature trip fixed value or a temperature alarm fixed value) in a later time period according to a plurality of temperature signals collected by the temperature sensor in a certain past time, a pre-judged temperature predicted value is used as input, and the fault type of a fault which possibly occurs in the future is pre-judged through a fault type judgment model, so that the pre-judgment of the fault is realized;
similarly, the judgment can be carried out according to a plurality of vibration signals collected by the vibration sensor in a certain past time, the motor has the risk of vibration exceeding the vibration tripping threshold or the vibration alarm threshold in a later time period according to the current vibration enhancement trend, and at the moment, the fault type of a fault which possibly occurs in the future is judged in advance through a fault type judgment model by taking a predicted vibration value which is judged in advance as input, so that the fault is judged in advance.
In practical application, the early warning information can be generated according to the pre-judged vibration predicted value and/or the pre-judged temperature predicted value, so that the pre-judgment of the running state of the motor is realized, the advance prevention and control of the motor abnormity or fault are facilitated, the occurrence of fault events is reduced, and the fault loss is reduced.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage device and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage device includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a ReRAM, an MRAM, a PCM, a NAND Flash, a NOR Flash, a Memory, a magnetic disk, an optical disk, or other various media that can store program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A motor fault diagnosis and protection control system comprising a remote terminal communicatively connected to a near field device; the near field equipment comprises a data acquisition unit, an A/D sampling unit and an execution circuit breaker; the remote terminal comprises an analysis unit;
the data acquisition unit is used for acquiring working condition signals including high-frequency partial discharge signals, current signals, voltage signals, temperature signals and vibration signals of the motor;
the A/D sampling unit is used for converting each working condition signal into a corresponding digital working condition signal;
the analysis unit is used for generating alarm information and/or control instructions according to preset rules by taking the digital working condition signals as parameters, and generating corresponding fault reports according to the digital working condition signals when the alarm information and/or the control instructions are generated;
and the execution circuit breaker is used for controlling the on-off of the power supply of the motor according to the control instruction.
2. The motor fault diagnosis and protection control system of claim 1, wherein the data acquisition unit comprises:
a high frequency current sensor for gathering high frequency partial discharge signal is in the three-phase inlet wire of motor.
3. The motor fault diagnosis and protection control system of claim 1, wherein the data acquisition unit comprises:
and the current sensor and the voltage sensor for acquiring the current signal and the voltage signal are buckled on the three-phase inlet wire of the motor.
4. The motor fault diagnosis and protection control system of claim 1, wherein the data acquisition unit comprises:
the built-in temperature sensor for collecting temperature signals is embedded in a three-phase winding of the motor and is tightly attached to the three-phase winding.
5. The motor fault diagnosis and protection control system of claim 1, wherein the data acquisition unit comprises:
the vibration sensor for collecting vibration signals comprises one of an eddy current sensor, a speed sensor, an acceleration sensor or a composite sensor and any combination thereof.
6. The motor fault diagnosis and protection control system according to claim 1, wherein the preset rule includes:
respectively presetting a numerical range and/or a threshold value corresponding to each digital working condition signal; the numerical range is the numerical range of each digital working condition signal when the motor is in a normal running state.
7. The motor fault diagnosis and protection control system according to claim 1, wherein the determination flow set in the preset rule includes:
judging whether the current exceeds a quick-break fixed value, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the current exceeds the overload duration fixed value for a long time, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether a single-phase earth fault occurs, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the three-phase voltage is lower than the undervoltage fixed value, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
judging whether the temperature exceeds a temperature tripping fixed value, if so, generating a control instruction for executing tripping of the circuit breaker, otherwise,
judging whether the temperature exceeds a temperature alarm fixed value, if so, sending out alarm information, otherwise,
judging whether the vibration exceeds a vibration trip fixed value, if so, generating a control instruction for executing the trip of the circuit breaker, otherwise,
judging whether the vibration exceeds a vibration alarm fixed value, if so, sending out alarm information, otherwise,
performing fast Fourier transform on the three-phase voltage and current signals, judging whether the harmonic voltage and current exceed a voltage and current trip fixed value, if so, generating a control instruction for executing the trip of the circuit breaker, otherwise,
judging whether the harmonic voltage and current exceed the voltage and current alarm constant value, if yes, sending out alarm information, otherwise,
judging whether the partial discharge signal exceeds the tripping fixed value of the electric signal, if so, generating a control instruction for executing the tripping of the circuit breaker, otherwise,
and judging whether the partial discharge signal exceeds a partial discharge alarm fixed value, and if so, sending alarm information.
8. The motor fault diagnosis and protection control system according to any one of claims 1 to 7, wherein the generating of the corresponding fault report according to the digital operating condition signal when the alarm information and/or the control instruction is generated comprises:
and constructing a fault type judgment model by taking the historical data of the digital working condition signal when the alarm information and/or the control instruction are generated as independent variables and the historical data of the actual fault type as dependent variables.
9. The motor fault diagnosis and protection control system according to any one of claims 1 to 7, characterized by further comprising:
the temperature pre-judging unit is used for pre-judging a temperature predicted value of a preset time point according to a temperature change trend in a past preset time period by taking a current time point as a reference; the preset time point is a time point after a preset time after the current time point;
and generating the fault risk of the preset time point according to the fault type judgment model by taking the temperature predicted value as input.
10. The motor fault diagnosis and protection control system according to claim 9, further comprising:
the vibration pre-judging unit is used for pre-judging a vibration predicted value of a preset time point according to a vibration change trend in a past preset time period by taking the current time point as a reference;
the input of the fault type judgment model for generating the fault risk at the preset time point further comprises the vibration prediction value.
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| CN115144027A (en) * | 2022-06-29 | 2022-10-04 | 河北建投沙河发电有限责任公司 | A method for remote monitoring of electrical equipment |
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