阅读说明：本技术 接触器故障预警方法及相关装置 (Contactor fault early warning method and related device ) 是由 朱文龙 曾威嶂 戴计生 江平 张中景 杨家伟 徐海龙 詹彦豪 唐黎哲 赵明伟 张 于 2021-01-05 设计创作，主要内容包括：本发明提供一种接触器故障预警方法及相关装置,该方法应用于接触器的PHM装置,该方法首先下发动作指令、控制接触器的开关状态,然后实时监测并记录接触器的运行参数；进而通过对运行参数进行处理,得到接触器的触头动作过程参数实际值；并根据运行参数,采用预设算法模型,计算得到接触器的触头动作过程参数理论值；最后通过对触头动作过程参数实际值和触头动作过程参数理论值进行差异性判断,得到接触器的触头预警结果,相较于现有技术只能在发生故障、影响机车车辆运行后,才能诊断出接触器存在的故障问题,本申请能够提前检测,也即本申请能够实现对接触器的早期故障诊断。(The invention provides a fault early warning method of a contactor and a related device, wherein the method is applied to a PHM device of the contactor, firstly, an action instruction is issued, the on-off state of the contactor is controlled, and then, the operation parameters of the contactor are monitored and recorded in real time; then, the actual value of the contact motion process parameter of the contactor is obtained by processing the operation parameter; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters; and finally, the difference judgment is carried out on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.)

1. The contactor fault early warning method is applied to a fault Prediction and Health Management (PHM) device of a contactor, and comprises the following steps:

issuing an action command and controlling the on-off state of the contactor;

monitoring and recording the operating parameters of the contactor in real time;

processing the operation parameters to obtain actual values of the contact motion process parameters of the contactor; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters;

and performing difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

2. The contactor failure warning method of claim 1, wherein the operating parameters include: the coil current, the coil voltage, the ambient temperature and the intermediate network voltage of the contactor;

the contact early warning result comprises the following steps: whether the main contact is stuck.

3. The contactor failure warning method of claim 2, wherein the operating parameters further comprise: an auxiliary contact voltage of the contactor;

the contact early warning result further comprises: whether the auxiliary contacts are stuck.

4. The contactor fault early warning method according to claim 3, wherein the actual value of the contact action process parameter is the actual time of the switch state action;

and the theoretical value of the contact motion process parameter is the calculation time of the switch state motion.

5. The contactor fault early warning method according to claim 4, wherein the step of processing the operation parameters to obtain actual values of the contact action process parameters of the contactor comprises the steps of:

and analyzing and extracting the characteristics of the current/voltage waveform data in the operating parameters to obtain the actual time of the on-off state action of the contactor.

6. The contactor fault early warning method according to claim 4, wherein the step of calculating a theoretical value of a parameter of a contact action process of the contactor by adopting a preset algorithm model according to the operation parameter comprises the following steps:

and according to the preset algorithm model, calculating to obtain the calculation time of the on-off state action of the contactor according to the environment temperature and the coil voltage.

7. The method for early warning the fault of the contactor according to any one of claims 1 to 6, wherein the step of performing difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain the contact early warning result of the contactor comprises the following steps:

continuously carrying out N times of difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter; n is a positive integer greater than 1;

comparing N times to judge whether the results are consistent;

and if the contact head is consistent with the contact head, generating a corresponding contact head early warning result.

8. The contactor failure early warning method according to any one of claims 1 to 6, wherein the step of processing the operation parameters to obtain actual values of the parameters of the contact action process of the contactor further comprises the steps of:

and extracting the characteristics of the operating parameters to obtain the coil stable current of the contactor.

9. The contactor fault pre-warning method according to claim 8, wherein after obtaining the coil stabilization current of the contactor, the method further comprises:

and judging whether the coil stable current accords with the switching state action characteristics of the contactor or not to obtain the coil fault early warning result of the contactor.

10. The contactor fault early warning method according to claim 9, wherein the step of judging whether the coil stabilization current meets the switch state action characteristics of the contactor to obtain the coil fault early warning result of the contactor comprises the steps of:

and comparing the coil stable current with a preset current threshold value of the contactor in a corresponding switch state, and determining a coil fault early warning result of the contactor according to a comparison result.

11. The contactor fault warning method according to claim 10, wherein the coil fault warning result includes: whether the coil is overheated and whether the coil is burned out.

12. A PHM device of a contactor, comprising: the system comprises a monitoring module, a diagnostic analysis module, a data storage module and a control module; wherein:

the monitoring module is used for monitoring the operating parameters of the contactor in real time;

the control module is used for issuing an action instruction and controlling the on-off state of the contactor;

the data storage module is used for recording the operating parameters of the contactor;

the diagnosis and analysis module is used for processing the operation parameters to obtain actual values of the parameters of the contact motion process of the contactor; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters; and performing difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

13. The contactor PHM device of claim 12, wherein the monitoring module comprises: a sensor module and a communication module;

the communication module is used for receiving the ambient temperature and the intermediate network voltage of the contactor;

the sensor module is used for monitoring other data in the operation parameters in real time.

14. The contactor PHM device of claim 13, wherein the diagnostic analysis module is further configured to:

extracting the characteristics of the operating parameters to obtain the coil stable current of the contactor;

and judging whether the coil stable current accords with the switching state action characteristics of the contactor or not to obtain the coil fault early warning result of the contactor.

15. A contactor PHM device according to any one of claims 12-14, further comprising: and the human-computer interaction module is used for displaying the coil fault early warning result and/or the contact early warning result, and controlling and transmitting the functions of the diagnosis and analysis module and the data storage module.

Technical Field

The invention relates to the technical field of communication, in particular to a fault early warning method for a contactor and a related device.

Background

In a magnetic levitation train, a subway, a locomotive or a high-speed train, the figure of a contactor is ubiquitous. In the main converter of the electric railway locomotive, the contactor is an indispensable device. If the contactor in the main converter breaks down, the main converter can directly fail to work normally, and further the normal operation of the rolling stock can be seriously influenced.

The existing contactor fault diagnosis method generally can diagnose the fault problem of the contactor after the contactor has a fault and influences the normal operation of a locomotive vehicle, and can not diagnose the early fault of the contactor.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and a related apparatus for early warning a contactor fault, so as to implement early fault diagnosis on a contactor.

In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

the first aspect of the present application discloses a contactor fault early warning method, which is applied to a PHM (fault prediction and health management) device, and the contactor fault early warning method includes:

issuing an action command and controlling the on-off state of the contactor;

monitoring and recording the operating parameters of the contactor in real time;

processing the operation parameters to obtain actual values of the contact motion process parameters of the contactor; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters;

and performing difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

Optionally, in the above method for early warning of a contactor fault, the operating parameters include: the coil current, the coil voltage, the ambient temperature and the intermediate network voltage of the contactor;

the contact early warning result comprises the following steps: whether the main contact is stuck.

Optionally, in the above method for early warning of a contactor fault, the operating parameters further include: an auxiliary contact voltage of the contactor;

the contact early warning result further comprises: whether the auxiliary contacts are stuck.

Optionally, in the above method for early warning of a fault of a contactor, the actual value of the parameter of the contact actuation process is the actual time of the switch state actuation;

and the theoretical value of the contact motion process parameter is the calculation time of the switch state motion.

Optionally, in the method for early warning of a fault of a contactor, the processing the operation parameters to obtain actual values of parameters of a contact motion process of the contactor includes:

and analyzing and extracting the characteristics of the current/voltage waveform data in the operating parameters to obtain the actual time of the on-off state action of the contactor.

Optionally, in the method for early warning of a fault of a contactor, a theoretical value of a parameter of a contact motion process of the contactor is obtained by calculation according to the operation parameter by using a preset algorithm model, and the method includes:

and according to the preset algorithm model, calculating to obtain the calculation time of the on-off state action of the contactor according to the environment temperature and the coil voltage.

Optionally, in the method for early warning a fault of a contactor, the difference between the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter is determined to obtain a contact early warning result of the contactor, and the method includes:

continuously carrying out N times of difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter; n is a positive integer greater than 1;

comparing N times to judge whether the results are consistent;

and if the contact head is consistent with the contact head, generating a corresponding contact head early warning result.

Optionally, in the method for early warning of a fault of a contactor, the processing the operation parameters to obtain an actual value of a parameter of a contact motion process of the contactor further includes:

and extracting the characteristics of the operating parameters to obtain the coil stable current of the contactor.

Optionally, in the method for early warning of a fault of a contactor, after obtaining the coil stabilization current of the contactor, the method further includes:

and judging whether the coil stable current accords with the switching state action characteristics of the contactor or not to obtain the coil fault early warning result of the contactor.

Optionally, in the method for early warning a fault of a contactor, determining whether the coil stable current meets the switch state action characteristics of the contactor to obtain a coil fault early warning result of the contactor includes:

and comparing the coil stable current with a preset current threshold value of the contactor in a corresponding switch state, and determining a coil fault early warning result of the contactor according to a comparison result.

Optionally, in the above contactor fault early warning method, the coil fault early warning result includes: whether the coil is overheated and whether the coil is burned out.

The PHM device of the contactor disclosed in the second aspect of the present application includes: the system comprises a monitoring module, a diagnostic analysis module, a data storage module and a control module; wherein:

the monitoring module is used for monitoring the operating parameters of the contactor in real time;

the control module is used for issuing an action instruction and controlling the on-off state of the contactor;

the data storage module is used for recording the operating parameters of the contactor;

the diagnosis and analysis module is used for processing the operation parameters to obtain actual values of the parameters of the contact motion process of the contactor; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters; and performing difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

Optionally, in the PHM apparatus of the contactor, the monitoring module includes: a sensor module and a communication module;

the communication module is used for receiving the ambient temperature and the intermediate network voltage of the contactor;

the sensor module is used for monitoring other data in the operation parameters in real time.

Optionally, in the PHM apparatus of the contactor, the diagnostic analysis module is further configured to:

extracting the characteristics of the operating parameters to obtain the coil stable current of the contactor;

and judging whether the coil stable current accords with the switching state action characteristics of the contactor or not to obtain the coil fault early warning result of the contactor.

Optionally, in the PHM apparatus of the contactor, the apparatus further includes: and the human-computer interaction module is used for displaying the coil fault early warning result and/or the contact early warning result, and controlling and transmitting the functions of the diagnosis and analysis module and the data storage module.

The contactor fault early warning method is applied to a PHM device of a contactor, firstly, an action instruction is issued, the on-off state of the contactor is controlled, and then, the operation parameters of the contactor are monitored and recorded in real time; then, the actual value of the contact motion process parameter of the contactor is obtained by processing the operation parameter; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters; and finally, the difference judgment is carried out on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a flowchart of a method for early warning a fault of a contactor according to an embodiment of the present disclosure;

fig. 2 is a flowchart of another contactor fault early warning method provided in the embodiment of the present application;

fig. 3 is a flowchart of another method for early warning of a contactor fault according to an embodiment of the present disclosure;

fig. 4 is a flowchart of another contactor fault early warning method provided in the embodiment of the present application;

fig. 5 is a schematic structural diagram of a PHM device of a contactor according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of another PHM device of a contactor according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiment of the application provides a contactor fault early warning method, so that early fault diagnosis of a contactor is realized.

The contactor fault early warning method is applied to a PHM device of a contactor. In practical application, the contactor is generally arranged in a magnetic levitation train, a subway, a locomotive, a high-speed train and the like, for convenience of description, the application scene of the contactor is set as the train, and methods in other scenes are applied the same.

After the train realizes the network signal input, the PHM device of the contactor can be started according to the network signal so as to execute the fault early warning method of the contactor.

Specifically, referring to fig. 1, the method for early warning the fault of the contactor mainly includes the following steps:

and S101, issuing an action command and controlling the on-off state of the contactor.

The PHM device can respond to superior instructions, such as control instructions issued by an upper computer, a DCU and the like, so as to realize the operation of issuing action instructions and controlling the on-off state of the contactor; or, based on the input information of the PHM device itself, such as a human-computer interaction module, the operations of issuing an action instruction and controlling the on-off state of the contactor are realized.

Specifically, by controlling the switching state of the contactor, the contactor can be controlled to be in different working states. Through the control process, the control coil in the contactor can be controlled to be electrified or deenergized, so that the contact of the contactor is in an attraction state or a release state.

And S102, monitoring and recording the operation parameters of the contactor in real time.

Wherein, the operating parameters of the contactor include: coil current, coil voltage, ambient temperature, and intermediate grid voltage of the contactor.

Specifically, the PHM device of the contactor can receive the ambient temperature and the intermediate network voltage of the contactor through the communication module provided in the PHM device, and record the received data.

In practical application, corresponding sensors can be independently arranged in the PHM device so as to directly detect and obtain the ambient temperature and the intermediate network voltage of the contactor.

And the sensor module in the PHM device can monitor other operating parameters, such as coil current, voltage, etc. of the contactor, in real time, except for ambient temperature and intermediate grid voltage.

It should be noted that the sensor module and the communication module may be both disposed in a monitoring module in the PHM device; of course, this sensor module and communication module can also set up respectively in the PHM device, and sensor module and communication module in the PHM device of this application do not do specifically and restrict, only need guarantee that the PHM device can realize real-time supervision and record the operating parameter of contactor can.

After the step S102 is executed, the steps S103 and S104 may be executed sequentially, or the steps S103 and S104 may be executed simultaneously. The order of executing S103 and S104 is not limited in this application, and all belong to the scope of protection of this application. Fig. 1 merely exemplifies that step S103 and step S104 are performed simultaneously.

And S103, processing the operation parameters to obtain actual values of the contact motion process parameters of the contactor.

And the actual value of the contact action process parameter is the actual time of the switch state action. Specifically, the actual time of the switch state action includes: the actual values of the parameters of the pull-in process and the actual values of the parameters of the release process.

In practical application, the actual time of the on-off state action of the contactor can be obtained by analyzing and extracting the characteristics of the current/voltage waveform data in the operation parameters.

In other words, the actual values of the parameters of the pick-up process and the release process can be obtained based on the intermediate net pressure and other parameters in the operation parameters by adopting a data analysis and feature extraction mode.

It should be noted that, the specific manner of performing data analysis and feature extraction may be determined according to the application environment and the user requirement, and the present application is not particularly limited, and all of them belong to the protection scope of the present application.

And S104, calculating to obtain a parameter theoretical value of the contact motion process of the contactor by adopting a preset algorithm model according to the operation parameters.

And the contact motion process parameter theoretical value is the calculation time of the switch state motion.

In practical application, the calculation time of the on-off state action of the contactor can be calculated according to the preset algorithm model and the environment temperature and the coil temperature.

Specifically, the environmental temperature and the coil temperature can be used as input parameters and input into a preset algorithm model constructed by adopting a neural network or a model construction technology, and a contact motion process parameter theoretical value of the contactor is obtained through calculation.

It should be noted that the preset algorithm model required for different types of contactors may be different. In practical application, the preset algorithm model can be determined according to the type of the contactor, the specific application environment and the user requirement, and the preset algorithm model is not specifically limited and is within the protection scope of the application.

Certainly, in order to improve the universality of the contactor fault early warning method, the preset algorithm model can be modified according to different types of contactors or the preset algorithm models corresponding to various types of contactors can be increased. Based on the principle provided by the contactor fault early warning method, any setting and modification of the preset algorithm model are within the protection scope of the application.

It should be noted that the theoretical values of the contact motion process parameters of the corresponding contactor at different temperatures and different voltages are not the same.

In practical application, after the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter of the contactor are obtained, the contact early warning result of the contactor can be obtained by executing the step S104.

And S105, performing difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

The early warning result of the contact of the contactor is as follows: whether the main contact is stuck and/or whether the auxiliary contact is stuck; the relevant signals of whether the main contact is clamped or not are coil voltage, intermediate network voltage and ambient temperature, and the relevant signals of whether the auxiliary contact is clamped or not are coil voltage, auxiliary contact voltage and ambient temperature; that is, when the operation parameters include the coil current, the coil voltage, the intermediate network voltage and the environment temperature of the contactor, the contact early warning result of the contactor is whether the main contact is stuck; when the operation parameters comprise coil current, coil voltage, auxiliary contact voltage and environment temperature of the contactor, the contact early warning result of the contactor is whether the auxiliary contact is stuck; when the operation parameters comprise the coil voltage, the intermediate network voltage, the ambient temperature and the auxiliary contact voltage of the contactor, the contact early warning result of the contactor comprises whether the main contact is clamped or not and whether the auxiliary contact is clamped or not.

In practical application, the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter are differentially judged, and the specific process of obtaining the contact early warning result of the contactor can be as follows:

firstly, difference parameters D and D are obtained after difference judgment is carried out on an actual value of a contact motion process parameter and a theoretical value of the contact motion process parameter.

Obtaining a difference judgment result based on the difference parameters D and D comprises:

when D and D are less than or equal to C1, the contact state of the contactor is healthy.

When D is more than C1 and D is less than or equal to C2, the contact state of the contactor is normal.

When the C2 is more than D and the D is less than or equal to C3, the contact state of the contactor is abnormal.

When C3 < D and C3 < D, the contact state of the contactor is warning.

Where C1 is the healthy state threshold, C2 is the normal state threshold, and C3 is the abnormal state threshold.

It should be noted that when the contact state of the contactor is healthy or normal, it indicates that the contact early warning result of the contactor is not stuck; when the contact state of the contactor is abnormal or warning, the early warning result of the contact of the contactor is clamping stagnation.

Based on the principle, the operating parameters of the contactor are monitored and recorded in real time; then, the actual value of the contact motion process parameter of the contactor is obtained by processing the operation parameter; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters; and finally, the difference judgment is carried out on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

Optionally, in practical application, the specific process of performing the step S105 and performing difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain the contact warning result of the contactor may also be as shown in fig. 2, and mainly includes the following steps:

s201, continuously carrying out N times of difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter.

Wherein N is a positive integer greater than 1.

In practical application, in order to ensure the accuracy of the early warning result, N may be 3; of course, the specific value of N may also be determined according to the specific application environment and the user requirement, and the present application does not limit the value, and all belong to the protection scope of the present application.

S202, comparing N times to judge whether the results are consistent.

In practical application, in order to ensure the accuracy of the early warning result, after the difference judgment is performed on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter for multiple times, the generated preset result can be determined by comparing whether the judgment results are consistent for N times.

If yes, go to step S203.

And S203, generating a corresponding contact early warning result.

If N is equal to 3, continuously performing differential judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter for 3 times, and if the obtained judgment results are all the auxiliary contact jamming, the formed contact early warning result is the auxiliary contact jamming; on the contrary, if at least one result in the obtained judgment results is different from other results, for example, the two judgment results are the clamping stagnation of the auxiliary contact, and the one judgment result is that the auxiliary contact is not clamped, the contact early warning result is not generated.

In this embodiment, not only can early fault diagnosis of the contactor be realized, but also accurate early warning of the main contact and the auxiliary contact of the contactor can be realized according to the actual value of the contact action process parameter and the theoretical value of the contact action process parameter, and the economic loss caused by the fault of the contactor is reduced.

On the basis of fig. 1, another embodiment provided by the present application further includes step S301 shown in fig. 3 while performing step S103 and processing the operation parameters to obtain actual values of contact motion process parameters of the contactor, or while performing step S104 and calculating theoretical values of the contact motion process parameters of the contactor by using a preset algorithm model according to the operation parameters.

S301, extracting the characteristics of the operation parameters to obtain the coil stable current of the contactor.

In practical application, the coil stable current of the contactor can be obtained by analyzing waveform data in the coil current of the contactor and extracting characteristics in the waveform data.

And, after the coil stabilization current of the contactor is obtained, step S302 may be performed to obtain a coil fault early warning result of the contactor.

S302, judging whether the coil stable current accords with the switch state action characteristics of the contactor or not, and obtaining a coil fault early warning result of the contactor.

The switching state operation characteristic of the contactor is a characteristic that the coil stabilization current should be expressed when the switching state of the contactor is controlled in step S101. For example, if the switching state of the contactor is controlled to be the attraction state, the corresponding switching state action characteristic is the characteristic that the coil stable current of the contactor should show when the contactor is switched to the attraction state; if the switching state of the control contactor is the release state, the corresponding switching state characteristic is a characteristic that the coil stabilization current should be expressed when the contactor is switched to the release state.

Specifically, if the coil stable current extracted after monitoring does not accord with the corresponding switching state action characteristics, the condition that the coil is overheated or the coil is burnt and damaged in the contactor is judged, and the obtained fault early warning result of the coil of the contactor is that the coil is overheated or the coil is burnt and damaged. And otherwise, if the coil stable current accords with the corresponding switch state action characteristic, the coil fault early warning result of the contactor is regarded as that no coil is overheated or burnt.

In practical application, step S302 is executed to determine whether the coil stable current meets the switch state action characteristics of the contactor, and a coil fault early warning result of the contactor is obtained, and the specific process may also be as shown in fig. 4:

s401, comparing the coil stable current with a preset current threshold value of the contactor in a corresponding switch state to obtain a comparison result.

The preset current thresholds corresponding to the contactors in different switch states are different. The preset current threshold comprises a preset current threshold when the contact is in a pull-in state and a preset current threshold when the contact is in a release state.

It should be noted that, the specific value of the preset current threshold may be determined according to the application environment and the user requirement, and the application does not specifically limit the specific value, and all belong to the protection scope of the application.

S402, determining a coil fault early warning result of the contactor according to the comparison result.

And the coil fault early warning result comprises whether the coil is overheated and whether the coil is burnt.

Specifically, the judgment principle of determining the coil fault early warning result of the contactor according to the comparison result can be set according to the actual condition, and the method is not specifically limited and is within the protection range of the contactor.

Based on the principle, the method can not only realize early fault diagnosis of the contactor, but also obtain the coil stable current of the contactor by extracting the characteristics of the operation parameters; and finally, obtaining a coil fault early warning result of the contactor in real time by judging whether the coil stable current accords with the switching state action characteristics of the contactor, so as to realize early fault diagnosis of the contactor coil.

It is worth explaining that in practical application, after the coil fault early warning result and the contact early warning result of the contactor are obtained, the operation health state of the contactor can be evaluated according to the contact early warning result and the coil fault early warning result. For example, when the early warning result of the contacts of the contactor is that neither of the two contacts is stuck, and the early warning result of the coil fault is that the coil is not overheated and the coil is not burnt, the running health state of the corresponding contactor is evaluated as healthy or normal; when any one of the contact early warning result and the coil fault early warning result of the contactor has a problem, the operation health state of the contactor can be evaluated as abnormal or caution according to the severity of the problem. The specific state evaluation grade is related to the grade division fineness of the contact early warning result and the coil fault early warning result according to the specific application environment, and is within the protection range of the application.

In other words, the resulting operating health assessment of the contactor is normal and healthy only if both the contacts and coils in the contactor are in a reasonable state; if there is an anomaly or an unreasonable condition in any one, the resulting assessment of the operating health of the contactor is problematic and unhealthy.

In practical application, after a coil fault early warning result and a contact early warning result of the contactor are obtained, or after the fault type and the health state of the contactor are evaluated, the maintenance work of the contactor can be guided according to the coil fault early warning result and the contact early warning result.

Optionally, another embodiment of the present application further provides a PHM device of a contactor, please refer to fig. 5, the PHM device of the contactor mainly includes: a monitoring module 101, a diagnostic analysis module 102, a data storage module 103, and a control module 104. Wherein:

the monitoring module 101 is used for monitoring the operating parameters of the contactor in real time.

The operating parameters include, but are not limited to, coil current, coil voltage, auxiliary contact voltage, ambient temperature, and intermediate grid voltage of the contactor.

When the operation parameters include the coil voltage, the intermediate network voltage and the ambient temperature of the contactor, the diagnosis and analysis module 102 can implement fault early warning diagnosis on the main contact of the contactor to obtain a contact early warning result indicating whether the main contact is stuck.

When the operation parameters further include the auxiliary contact voltage of the contactor, the diagnostic analysis module 102 may further implement auxiliary contact diagnosis on the contactor to obtain a contact warning result indicating whether the auxiliary contact is stuck.

When the operating parameters include not only the coil voltage, the intermediate network voltage, and the ambient temperature of the contactor, but also the voltage of the auxiliary contact, the diagnostic analysis module 102 can also diagnose the main contact and the auxiliary contact in the contactor at the same time, and obtain the contact warning result of whether the main contact and the auxiliary contact are stuck or not.

The control module 104 is used for issuing an action command and controlling the on-off state of the contactor.

The data storage module 103 is used for recording the operating parameters of the contactor.

The diagnostic analysis module 102 is used for processing the operation parameters to obtain actual values of the parameters of the contact motion process of the contactor; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters; and (4) carrying out difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain a contact early warning result of the contactor.

In this embodiment, by the mutual cooperation of the monitoring module 101, the diagnostic analysis module 102, the data storage module 103 and the control module 104 in the PHM device, the issuing of an action instruction and the control of the on-off state of the contactor in the contactor fault early warning method can be completed, the operation parameters of the contactor are monitored and recorded in real time, and the operation parameters are processed to obtain the actual values of the contact action process parameters of the contactor; calculating to obtain a contact motion process parameter theoretical value of the contactor by adopting a preset algorithm model according to the operation parameters; and (4) carrying out difference judgment on the actual value of the contact motion process parameter and the theoretical value of the contact motion process parameter to obtain the operation in the contact early warning result of the contactor, thereby realizing early fault diagnosis of the contactor.

Optionally, referring to fig. 6, the monitoring module in the PHM device of the contactor includes: a communication module 105 and a sensor module 106.

The communication module 105 is configured to receive an ambient temperature of the contactor and an intermediate network voltage.

The sensor module 106 is used to monitor other data in the operating parameters in real time. For example, the coil current, the coil voltage, the auxiliary contact voltage, and other data of the contactor required for determining whether the contactor contacts are stuck or for controlling the state of the coil are included.

In practical applications, when the operation parameter further includes a coil current of the contactor, the diagnostic analysis module 102 in the PHM apparatus of the contactor is further configured to:

and (4) performing characteristic extraction on the operation parameters to obtain the coil stable current of the contactor.

And judging whether the coil stable current accords with the switching state action characteristics of the contactor or not to obtain the coil fault early warning result of the contactor.

The PHM device of the contactor can obtain the contact early warning result of the contactor according to the operation parameters so as to realize early fault diagnosis of the contactor, further realize accurate early warning of the contactor contact, reduce economic loss caused by contactor faults, and obtain the fault early warning result of the control coil of the contactor according to the operation parameters.

Optionally, the PHM device of the contactor further comprises: and the human-computer interaction module is used for displaying the coil fault early warning result and/or the contact early warning result, and controlling the diagnosis and analysis module and the data storage module and transmitting data.

It should be noted that, by combining the sensor module 106, the diagnostic analysis module 102, the data storage module 103, the control module 104, the communication module 105, and the human-computer interaction module in the PHM device, the method for early warning of a fault of a contactor provided in the above embodiment can be implemented, and specific principles and processes are not described in detail again, and reference may be made to the above embodiment.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.