CN109799429B - Arcing state determination method and device - Google Patents
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- CN109799429B CN109799429B CN201811535391.1A CN201811535391A CN109799429B CN 109799429 B CN109799429 B CN 109799429B CN 201811535391 A CN201811535391 A CN 201811535391A CN 109799429 B CN109799429 B CN 109799429B
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Abstract
The invention provides an arcing state determination method and device. The arcing state determination method includes: acquiring m groups of measured values on a loop cable in a preset time period beginning at a short-circuit stage; determining a functional relation between interference voltage and current according to the m groups of measured values; determining a real-time interference voltage according to the functional relationship and the real-time current on the loop cable after the preset time period; determining an arc voltage according to a real-time voltage on the loop cable and the real-time interference voltage; and when the arc voltage is greater than a preset value, judging that the system enters an arcing state. The arcing state judgment method provided by the disclosure can accurately judge the arcing state when the cable is placed in a non-linear manner.
Description
Technical Field
The disclosure relates to the technical field of electric welding, in particular to an arcing state determination method and device capable of being applied to a cable nonlinear setting state.
Background
In the welding field, it is default that the cable is fully deployed at the time of welding, since the welding voltage needs to be collected with fine waveform control. However, in some special cases, the user will solder the cable coil, as shown in fig. 1A, where the coiled cable forms a large inductance, forming an equivalent circuit as shown in fig. 1B. As shown in fig. 1B, the loop voltage u detected at this time is i × R + L · di/dt + uaWherein u isaIs the actual voltage. It can be seen that if the inductance is large, even small changes in current will result in sudden changes in the acquired voltage u, in which case accurate arcing decisions are difficult to make.
If the voltage collection point is on the wire feeder side, as shown in FIG. 2AIt is shown that the cable and the voltage feedback line are coiled together (the dotted line is the voltage feedback line), and the equivalent circuit is shown in fig. 2B. In fig. 2B, although there is no influence of inductance generated by the cable coil, the cable and the voltage feedback line form a "transformer", which results in the collected voltage u-u1+uaWherein u is1The secondary voltage of this "transformer" also affects the accuracy of the short circuit arcing determination.
In practical use, the diameter of the cable coil and the number of coils are not fixed, so that it is difficult to estimate the arc voltage by measuring the inductance or the transformation ratio of the transformer in advance. Therefore, an arcing judgment method which can adapt to actual use scenes and overcome errors caused by a cable non-unfolding state is needed.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to an arcing state determination method and an arcing state determination apparatus, which are used to overcome, at least to some extent, the problems of abnormal arcing determination, waveform control disorder, and welding effect influence caused by incomplete cable deployment due to limitations and defects of the related art.
According to a first aspect of the embodiments of the present disclosure, there is provided an arcing state determination method including: acquiring m groups of measured values on a loop cable in a preset time period beginning at a short-circuit stage; determining a functional relation between interference voltage and current according to the m groups of measured values; determining a real-time interference voltage according to the functional relationship and the real-time current on the loop cable after the preset time period; determining an arc voltage according to a real-time voltage on the loop cable and the real-time interference voltage; and when the arc voltage is greater than a preset value, judging that the system enters an arcing state.
In an exemplary embodiment of the present disclosure, the measured values include a voltage value, a current value, and a current change rate.
In an exemplary embodiment of the disclosure, the determining the interference voltage as a function of current from the m sets of measured values comprises:
determining a group of measured values with the current change rate of 0 in the m groups of measured values, and determining a loop resistor r according to the ratio of the voltage value to the current value in the group of measured values;
substituting the m groups of measured values into formula Un＝U1n+Uan＝f(In，dIn)+r·InTo form m formulae, wherein Un、In、dInThe voltage value, current value, and current change rate in the n-th set of measured values, U1nAnd UanRespectively representing the interference voltage and the arc voltage corresponding to the nth group of measured values;
determining U1 according to the m formulasn＝f(In，dIn) Is described in (1).
In an exemplary embodiment of the present disclosure, the determining U1 according to the m formulasn＝f (In，dIn) The expression (c) includes:
calculating the m formulas using pre-set regression analysis software to determine a plurality of expressions;
selecting one expression with the highest matching degree with the m groups of data in the plurality of expressions as U1n＝f(In，dIn) Is described in (1).
In an exemplary embodiment of the present disclosure, the determining the arc voltage from the real-time voltage on the loop cable and the real-time interference voltage includes:
determining a difference between the real-time voltage and the disturbance voltage as the arc voltage.
In an exemplary embodiment of the disclosure, the starting time point of the preset time period is the starting time point of the short circuit phase, and the length of the preset time period is between 0.5 ms and 1.2 ms.
In one exemplary embodiment of the present disclosure, the preset period includes a first period in which a current change rate is 0 and a second period in which the current change rate is not 0, and the length of the second period is greater than the length of the first period.
According to a second aspect of the embodiments of the present disclosure, there is provided an arcing state determination apparatus including:
the data acquisition module is set to acquire m groups of measured values on the loop cable in a preset time period beginning at a short-circuit stage;
a function fitting module configured to determine a functional relationship between the interference voltage and the current according to the m groups of measured values;
the interference voltage determining module is set to determine real-time interference voltage according to the functional relation and real-time current on the loop cable after the preset time period;
a voltage correction module configured to determine an arc voltage from a real-time voltage on the loop cable and the real-time interference voltage;
and the arcing judgment module is used for judging that the system enters an arcing state when the arc voltage is greater than a preset value.
According to a third aspect of the present disclosure, there is provided an electronic device comprising: a memory; and a processor coupled to the memory, the processor configured to perform the method of any of the above based on instructions stored in the memory.
According to a fourth aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon a program which, when executed by a processor, implements the arcing state determination method as recited in any one of the above.
According to the arcing judgment method provided by the embodiment of the disclosure, the relationship between the interference voltage and the current in the circuit is measured in a period of time from the beginning of the short-circuit stage, the interference voltage is measured in real time in subsequent measurement, and the real-time detection voltage is corrected, so that the placement of a non-complete unfolding mode of a cable by a user in an actual use scene can be overcome, and the accuracy of arcing judgment can be maintained in various scenes.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1A and 1B are schematic diagrams of interference voltages in a usage scenario.
Fig. 2A and 2B are schematic diagrams of interference voltages in another usage scenario.
Fig. 3 is a flowchart of an arcing state determination method in an exemplary embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a preset period in an exemplary embodiment of the present disclosure.
Fig. 5 is a sub-flowchart of an arcing state determination method in an exemplary embodiment of the present disclosure.
Fig. 6 is a block diagram of an arcing state determination apparatus in an exemplary embodiment of the present disclosure.
FIG. 7 is a block diagram of an electronic device in an exemplary embodiment of the disclosure.
FIG. 8 is a schematic diagram of a computer-readable storage medium in an exemplary embodiment of the disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
Further, the drawings are merely schematic illustrations of the present disclosure, in which the same reference numerals denote the same or similar parts, and thus, a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The following detailed description of exemplary embodiments of the disclosure refers to the accompanying drawings.
Fig. 3 schematically shows a flowchart of an arcing state determination method in an exemplary embodiment of the present disclosure. Referring to fig. 3, an arcing state determination method 100 may include:
step S102, collecting m groups of measured values on a loop cable in a preset time period starting from a short-circuit stage;
step S104, determining the functional relation between the interference voltage and the current according to the m groups of measured values;
step S106, determining real-time interference voltage according to the functional relation and the real-time current on the loop cable after the preset time period;
step S108, determining arc voltage according to the real-time voltage on the loop cable and the real-time interference voltage;
and step S110, judging that the system enters an arcing state when the arc voltage is greater than a preset value.
According to the arcing judgment method provided by the embodiment of the disclosure, the relationship between the interference voltage and the current in the circuit is measured in a period of time from the beginning of the short-circuit stage, the interference voltage is measured in real time in subsequent measurement, and the real-time detection voltage is corrected, so that the placement of a non-complete unfolding mode of a cable by a user in an actual use scene can be overcome, and the accuracy of arcing judgment can be maintained in various scenes.
Next, each step of the fuel arc state determination method 100 will be described in detail.
In step S102, m sets of measured values on the loop cable are collected within a preset time period from the start of the short-circuit phase.
Fig. 4 is a schematic diagram of a preset time period in an embodiment of the present disclosure.
Referring to fig. 4, the preset period T may be set to a period in which an arcing state does not occur at a high probability. In some embodiments, the starting time point of the preset period T is the starting time point of the short-circuit period, and the length of the preset period is between 0.5 ms and 1.2 ms. In other embodiments, the starting time point of the preset phase may be at other time points of the short-circuit phase, as long as the arcing state is not entered in the preset phase. The setting of the preset time period can be adjusted by the person skilled in the art.
In a preset time period T, measured values corresponding to the time points can be collected at the m time points, and in order to ensure the reliability of subsequent fitting results, the optimal fitting result in the current environment can be obtained by adjusting the numerical value of m. In addition, the intervals of the m time points may be set by themselves, and in some embodiments, the intervals of the m time points may all be the same.
In summary, in the embodiment of the present disclosure, it is assumed that the interference voltage is related to the current magnitude, the current change rate, and the measured voltage, and therefore, the measured value is set as the current value, the current change rate, and the voltage value. In other embodiments, other measured values may be added by those skilled in the art to correct the calculation result.
In step S104, a functional relationship between the interference voltage and the current is determined according to the m sets of measured values.
Fig. 5 is a sub-flowchart of step S104.
Referring to fig. 5, in one embodiment, step S104 may include:
step S1041, determining a group of measured values with a current change rate of 0 among the m groups of measured values, and determining a loop resistance r according to a ratio of a voltage value to a current value in the group of measured values;
step S1042, substituting m groups of measured values into formula Un＝U1n+Uan＝f(In，dIn)+r·InTo form m formulae, wherein Un、In、dInThe voltage value, current value, and current change rate in the n-th set of measured values, U1nAnd UanThe interference voltage and the arc voltage corresponding to the nth group of measured values respectively;
step S1043, determining U1 according to m formulasn＝f(In，dIn) Is described in (1).
Referring to fig. 4, in one embodiment of the present disclosure, the preset period includes a first period T1 in which the current change rate is 0 and a second period T2 in which the current change rate is not 0, the length of the second period being greater than the length of the first period.
First, the loop resistance (the loop resistance r changes in the later stage of the short circuit) can be determined by the ratio of the voltage value to the current value in the set of measured values with the measured value current change rate of 0 in the period T1 (about 0.05-0.1ms), and the current in the period T1 is constant and short in time.
In the disclosed embodiment, the expression for setting the disturb voltage U1 is U1 ═ f (I)n，dIn) I.e. assume that the disturbance voltage U1 is related to the current value and the rate of change of the current. Since the form in which the user places the cable cannot be determined, the present disclosure does not limit f (I)n，dIn) But is determined by the fitting results.
The m sets of measured values can be substituted into the above formula to form input data for the regression analysis software, allowing the regression analysis software to fit the m formulas by a common fitting method to determine f (I)n，dIn) A plurality of expressions of (2). Finally, the expression with the highest coincidence degree with the m groups of measured values can be selected from the multiple expressions as f (I)n，dIn) I.e., the expression for the disturbance voltage U1.
It should be noted that, because fitting the data may generate a plurality of fitting results, and the fitting results are different for different input data, the fitting process is required before the arcing state is determined each time, so as to determine the relationship between the interference voltage, the current and the current change rate in the current environment and the cable state.
In step S106, a real-time interference voltage is determined according to the functional relationship and the real-time current on the loop cable after the preset time period.
After the preset period, the real-time interference voltage U1 may be calculated by measuring the real-time current I, the real-time current rate of change dI, and substituting it into an expression where U1 ═ f (I, dI).
In step S108, the arc voltage is determined according to the real-time voltage on the loop cable and the real-time interference voltage.
In the latter stage of the short circuit, the loop resistance r changes greatly, so that the arc voltage Ua cannot be obtained from Ua ═ r · I. In the embodiment of the present disclosure, the arc voltage Ua is set as the difference between the real-time voltage U and the interference voltage U1, and the current arc voltage value is measured by the formula Ua-U1-U-f (I, dI).
Because the measuring result removes the influence of interference voltage, the measuring result can accurately express the real arc voltage under various cable forms, and the measuring accuracy of the arc voltage is improved.
In other embodiments, the relationship between the arc voltage and the interference voltage can be set in other forms according to the cable placement state.
In step S110, when the arc voltage is greater than a preset value, it is determined that the system enters an arcing state.
After the actual arc voltage is obtained, whether the system enters an arcing state or not can be judged according to the arc voltage. Wherein the preset value for determining that the system is in an arcing state can be set by a person skilled in the art.
Corresponding to the method embodiment, the present disclosure also provides an arcing state determination apparatus, which may be used to execute the method embodiment.
Fig. 6 schematically shows a block diagram of an arcing state determination apparatus in an exemplary embodiment of the present disclosure.
Referring to fig. 6, the arcing state determination apparatus 600 may include:
a data acquisition module 602 configured to acquire m sets of measured values on the loop cable within a preset time period from the start of the short-circuit phase;
a function fitting module 604 configured to determine a functional relationship between the interference voltage and the current according to the m sets of measured values;
an interference voltage determination module 606 configured to determine a real-time interference voltage according to the functional relationship and the real-time current on the loop cable after the preset time period;
a voltage correction module 608 configured to determine an arc voltage from the real-time voltage on the loop cable and the real-time interference voltage;
and the arcing judgment module 610 is configured to judge that the system enters an arcing state when the arc voltage is greater than a preset value.
In an exemplary embodiment of the present disclosure, the measured values include a voltage value, a current value, and a current change rate.
In an exemplary embodiment of the disclosure, the function fitting module 604 is arranged to:
determining a group of measured values with the current change rate of 0 in the m groups of measured values, and determining a loop resistor r according to the ratio of the voltage value to the current value in the group of measured values;
substituting the m groups of measured values into formula Un＝U1n+Uan＝f(In，dIn)+r·InTo form m formulae, wherein Un、In、dInThe voltage value, current value, and current change rate in the n-th set of measured values, U1nAnd UanRespectively representing the interference voltage and the arc voltage corresponding to the nth group of measured values;
determining U1 according to the m formulasn＝f(In，dIn) Is described in (1).
In an exemplary embodiment of the present disclosure, the determining U1 according to the m formulasn＝f (In，dIn) Expression ofThe formula comprises:
calculating the m formulas using pre-set regression analysis software to determine a plurality of expressions;
selecting one expression with the highest matching degree with the m groups of data in the plurality of expressions as U1n＝f(In，dIn) Is described in (1).
In an exemplary embodiment of the present disclosure, the voltage correction module 608 is configured to:
determining a difference between the real-time voltage and the disturbance voltage as the arc voltage.
In an exemplary embodiment of the disclosure, the starting time point of the preset time period is the starting time point of the short circuit phase, and the length of the preset time period is between 0.5 ms and 1.2 ms.
In an exemplary embodiment of the present disclosure, a length of the preset period is proportional to a length of the short circuit period.
Since the functions of the apparatus 600 have been described in detail in the corresponding method embodiments, the disclosure is not repeated herein.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
In an exemplary embodiment of the present disclosure, an electronic device capable of implementing the above method is also provided.
As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or program product. Thus, various aspects of the invention may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
An electronic device 700 according to this embodiment of the invention is described below with reference to fig. 7. The electronic device 700 shown in fig. 7 is only an example and should not bring any limitation to the functions and the scope of use of the embodiments of the present invention.
As shown in fig. 7, electronic device 700 is embodied in the form of a general purpose computing device. The components of the electronic device 700 may include, but are not limited to: the at least one processing unit 710, the at least one memory unit 720, and a bus 730 that couples various system components including the memory unit 720 and the processing unit 710.
Wherein the storage unit stores program code that is executable by the processing unit 710 such that the processing unit 710 performs the steps according to various exemplary embodiments of the present invention as described in the above section "exemplary method" of the present specification. For example, the processing unit 710 may execute step S102 as shown in fig. 3: acquiring m groups of measured values on a loop cable in a preset time period beginning at a short-circuit stage; step S104: determining a functional relation between interference voltage and current according to the m groups of measured values; step S106: determining a real-time interference voltage according to the functional relationship and the real-time current on the loop cable after the preset time period; step S108: and determining the arc voltage according to the real-time voltage on the loop cable and the real-time interference voltage.
The storage unit 720 may include readable media in the form of volatile memory units, such as a random access memory unit (RAM)7201 and/or a cache memory unit 7202, and may further include a read only memory unit (ROM) 7203.
The storage unit 720 may also include a program/utility 7204 having a set (at least one) of program modules 7205, such program modules 7205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The electronic device 700 may also communicate with one or more external devices 800 (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 700, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 700 to communicate with one or more other computing devices. Such communication may occur via an input/output (I/O) interface 750. Also, the electronic device 700 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the internet) via the network adapter 760. As shown, the network adapter 760 communicates with the other modules of the electronic device 700 via the bus 730. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 700, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.
In an exemplary embodiment of the present disclosure, there is also provided a computer-readable storage medium having stored thereon a program product capable of implementing the above-described method of the present specification. In some possible embodiments, aspects of the invention may also be implemented in the form of a program product comprising program code means for causing a terminal device to carry out the steps according to various exemplary embodiments of the invention described in the above section "exemplary methods" of the present description, when said program product is run on the terminal device.
Referring to fig. 8, a program product 900 for implementing the above method according to an embodiment of the present invention is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited in this regard and, in the present document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A computer readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
Furthermore, the above-described figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (8)
1. An arcing state determination method, characterized by comprising:
acquiring m groups of measured values on a loop cable in a preset time period beginning at a short-circuit stage, wherein the measured values comprise a voltage value, a current value and a current change rate;
determining a functional relation between interference voltage and current according to the m groups of measured values;
determining a real-time interference voltage according to the functional relationship and the real-time current on the loop cable after the preset time period;
determining an arc voltage according to a real-time voltage on the loop cable and the real-time interference voltage;
when the arc voltage is larger than a preset value, judging that the system enters an arcing state;
wherein determining the functional relationship between the interference voltage and the current according to the m sets of measured values comprises:
determining a group of measured values with the current change rate of 0 in the m groups of measured values, and determining a loop resistor r according to the ratio of the voltage value to the current value in the group of measured values;
substituting the m groups of measured values into formula Un＝U1n+Uan＝f(In,dIn)+r·InTo form m formulae, wherein Un、In、dInThe voltage value, current value, and current change rate in the n-th set of measured values, U1nAnd UanRespectively representing the interference voltage and the arc voltage corresponding to the nth group of measured values;
determining U1 according to the m formulasn＝f(In，dIn) Is described in (1).
2. The arcing state determination method according to claim 1, wherein said determining U1 from said m formulasn＝f(In，dIn) The expression (c) includes:
calculating the m formulas using pre-set regression analysis software to determine a plurality of expressions;
one expression having the highest degree of matching with the m sets of actual measurement values is selected among the plurality of expressions as an expression of U1n ═ f (In, dIn).
3. The arcing state determination method according to any one of claims 1 or 2, wherein the determining the arc voltage from the real-time voltage on the loop cable and the real-time interference voltage comprises:
determining a difference between the real-time voltage and the disturbance voltage as the arc voltage.
4. The arcing state determination method according to claim 1, wherein a starting time point of the predetermined period is a starting time point of the short circuit stage, and a length of the predetermined period is between 0.5 ms and 1.2 ms.
5. The arcing state determination method according to claim 4, wherein the preset period includes a first period in which a current change rate is 0 and a second period in which a current change rate is not 0, a length of the second period being greater than a length of the first period.
6. An arcing state determination device, comprising:
the data acquisition module is arranged for acquiring m groups of measured values on the loop cable in a preset time period beginning at a short-circuit stage, wherein the measured values comprise voltage values, current values and current change rates;
a function fitting module configured to determine a functional relationship between the interference voltage and the current according to the m groups of measured values;
the interference voltage determining module is set to determine real-time interference voltage according to the functional relation and real-time current on the loop cable after the preset time period;
a voltage correction module configured to determine an arc voltage from a real-time voltage on the loop cable and the real-time interference voltage;
the arcing judgment module is used for judging that the system enters an arcing state when the arc voltage is greater than a preset value;
wherein the function fitting module is arranged to:
determining a group of measured values with the current change rate of 0 in the m groups of measured values, and determining a loop resistor r according to the ratio of the voltage value to the current value in the group of measured values;
substituting the m groups of measured values into formula Un＝U1n+Uan＝f(In,dIn)+r·InTo form m formulae, wherein Un、In、dInThe voltage value, current value, and current change rate in the n-th set of measured values, U1nAnd UanRespectively representing the interference voltage and the arc voltage corresponding to the nth group of measured values;
determining U1 according to the m formulasn＝f(In，dIn) Is described in (1).
7. An electronic device, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the arc on status determination method of any of claims 1-5 based on instructions stored in the memory.
8. A computer-readable storage medium on which a program is stored, which program, when executed by a processor, implements the arcing state determination method according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811535391.1A CN109799429B (en) | 2018-12-14 | 2018-12-14 | Arcing state determination method and device |
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