CN113687116A - Arc discharge fault detection device, system and method - Google Patents
Arc discharge fault detection device, system and method Download PDFInfo
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Abstract
本发明公开了一种拉弧故障检测装置、系统及方法，其中，拉弧故障检测装置包括：光强检测模块，用于检测指定区域内的环境光强，并将检测到的光强信号转换为电信号；比较模块，用于将电信号的信号强度值与预设的信号强度阈值进行比较，且当电信号的信号强度值大于预设的信号强度阈值时，输出故障信号。本发明公开的拉弧故障检测装置能够实时监测变频器是否发生拉弧故障。
The invention discloses an arcing fault detection device, system and method, wherein the arcing fault detection device comprises: a light intensity detection module, which is used to detect the ambient light intensity in a designated area and convert the detected light intensity signal is an electrical signal; the comparison module is used to compare the signal strength value of the electrical signal with a preset signal strength threshold, and output a fault signal when the signal strength value of the electrical signal is greater than the preset signal strength threshold. The arc fault detection device disclosed by the invention can monitor in real time whether an arc fault occurs in the frequency converter.
Description
Technical Field
The invention belongs to the technical field of fault detection, and particularly relates to an arc discharge fault detection device, system and method.
Background
In a frequency converter, a bus bar connects together the various current-carrying branch circuits in a power distribution device and functions to collect, distribute and transfer electrical energy. The bus usually adopts copper bars or aluminum bars, and has the characteristics of compact structure, large current density, small resistance, small skin effect and the like.
Due to the fact that the distance between the buses of the frequency converter is small, metallic dust or invasion of small animals and the like exist in the working environment, and short circuit arc discharge of the buses of the frequency converter is easily caused. When the arc discharge fault occurs to the bus of the frequency converter, the bus of the frequency converter is easy to cause combustion and explosion, and if the arc discharge fault is not found and eliminated in time, serious safety accidents can be caused.
Therefore, when an arc discharge fault occurs to a bus of the frequency converter, how to timely find the arc discharge fault so as to timely take corresponding measures to avoid the occurrence of safety accidents is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In order to overcome the above disadvantages of the prior art, an object of the present invention is to provide an arc discharge fault detection apparatus, system and method, which aim to monitor whether an arc discharge fault occurs in a frequency converter in real time, so that corresponding measures can be taken in time to avoid a safety accident when the arc discharge fault occurs in the frequency converter.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an arcing fault detection apparatus, comprising:
the light intensity detection module is used for detecting the ambient light intensity in the designated area and converting the detected light intensity signal into an electric signal;
and the comparison module is used for comparing the signal intensity value of the electric signal with a preset signal intensity threshold value, and outputting a fault signal when the signal intensity value of the electric signal is greater than the preset signal intensity threshold value.
Further, the light intensity detection module includes:
the light intensity detection unit is used for detecting the ambient light intensity in the designated area and converting the detected light intensity signal into a current signal;
the signal conversion unit is used for converting the current signal into a voltage signal;
and the signal amplifying unit is used for amplifying the voltage signal and outputting the amplified voltage signal to the comparison module.
Further, the comparison module includes:
the comparison unit is used for comparing the voltage value of the voltage signal with a preset voltage threshold value and outputting the fault signal when the voltage value is larger than the preset voltage threshold value; wherein the fault signal is a high level signal or a low level signal.
Further, the comparing module further includes:
and the signal conditioning unit is used for converting the fault signal into a corresponding digital signal and outputting the digital signal.
Furthermore, the arc discharge fault detection device further comprises a printed circuit board, the light intensity detection module and the comparison module are both fixed on the printed circuit board, and the light intensity detection module is electrically connected with the comparison module through the printed circuit board.
Furthermore, a plurality of welding pads and/or a plurality of screw mounting holes are arranged on the printed circuit board.
Furthermore, the arc discharge fault detection device further comprises a signal wire, and one end of the signal wire is fixed on the bonding pad and electrically connected with the bonding pad.
Correspondingly, the invention also provides an arc fault detection system, which comprises a main control module, a power supply module at least used for supplying power to the frequency converter and the arc fault detection device, wherein the main control module is respectively and electrically connected with the power supply module and the comparison module; when the master control module receives the fault signal output by the comparison module, the master control module controls the power supply module to stop supplying power to the frequency converter.
Further, the main control module is an upper computer or a control circuit board of the frequency converter.
Correspondingly, the invention also provides an arc fault detection method, which comprises the following steps:
detecting the ambient light intensity in the designated area, and converting the detected light intensity signal into a current signal;
converting the current signal into a voltage signal, and amplifying the voltage signal;
comparing the voltage value of the amplified voltage signal with a preset voltage threshold value, and judging whether the voltage value is greater than the preset voltage threshold value;
and if the voltage value is larger than the preset voltage threshold value, outputting a fault signal.
Compared with the prior art, the invention has the beneficial effects that:
the arc discharge fault detection device provided by the invention utilizes the characteristic that a frequency converter can emit strong light when an arc discharge fault occurs, the light intensity detection module is arranged to detect the ambient light intensity in an arc discharge fault easily-occurring area, the light intensity detection module converts a detected light intensity signal into a corresponding electric signal and outputs the electric signal to the comparison module, the comparison module receives the electric signal output by the light intensity detection module and judges whether the signal intensity value of the electric signal is greater than a preset signal intensity threshold value, if so, a fault signal for indicating that the current frequency converter has the arc discharge fault is output, and therefore, the real-time monitoring of the arc discharge fault problem is realized, and corresponding measures can be timely adopted to avoid safety accidents when the frequency converter has the arc discharge fault.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an arc fault detection apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an arcing fault detection apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic view of an installation of the arcing fault detection apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic view of the installation of the arcing fault detection apparatus according to another embodiment of the present invention;
fig. 5 is a schematic flow chart of an arc discharge fault detection method according to an embodiment of the present invention.
Description of reference numerals:
1-a light intensity detection module, 11-a light intensity detection unit, 12-a signal conversion unit and 13-a signal amplification unit;
2-a comparison module, 21-a comparison unit, 22-a signal conditioning unit;
3-printed circuit board, 31-bonding pad, 32-screw mounting hole;
4-signal line, 5-main control module, 51-control circuit board, 6-frequency converter casing, 7-fixing screw.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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 the field of frequency converters, a bus bar of the frequency converter connects together various current-carrying branch circuits in a distribution device, and plays a role in collecting, distributing and transmitting electric energy. The bus usually adopts copper bars or aluminum bars, and has the characteristics of compact structure, large current density, small resistance, small skin effect and the like.
Due to the fact that the distance between the buses of the frequency converter is small, metallic dust or invasion of small animals and the like exist in the working environment, and short circuit arc discharge of the buses of the frequency converter is easily caused. When an arc discharge fault occurs to a bus of the frequency converter, strong light and heat can be emitted, and combustion and explosion are easily caused, so that if the arc discharge fault is not found and eliminated in time, a serious safety accident can be caused.
To the design of preventing drawing an arc of converter, generally adopt increase bus-bar interval, strengthen cabinet body structure (including adopting the explosion-proof cabinet body) and adopt modes such as simple short-circuit protection at present, however the defect that the design of preventing drawing an arc of these forms exists is:
(1) increase generating line interval and strengthen cabinet body structure and all can increase the overall dimension of converter very obviously, so not only can increase the material cost, be unfavorable for the installation and the transportation of converter moreover.
(2) When arc discharge occurs at some fault points of the frequency converter, short-circuit protection cannot be triggered in a short time due to the loop inductance, the filter reactor and the like, so that safety accidents such as fire, explosion and the like cannot be effectively avoided.
Aiming at the defects of the existing arc-pulling-prevention design, the embodiment of the invention provides the arc-pulling fault detection device which not only can monitor whether the arc-pulling fault occurs to the related line in real time under the premise of not influencing the function of the original frequency converter, but also has the advantages of simple structure and low cost. Specifically, referring to fig. 1, the arcing fault detection apparatus includes:
the light intensity detection module 1 is used for detecting the ambient light intensity in the designated area and converting the detected light intensity signal into an electric signal;
the comparison module 2 is used for comparing the signal intensity value of the electric signal with a preset signal intensity threshold value so as to judge whether the signal intensity value of the electric signal is greater than the preset signal intensity threshold value; when the signal intensity value of the electric signal is greater than a preset signal intensity threshold value, the comparison module 2 outputs a fault signal for indicating that the arc discharge fault occurs in the current frequency converter; and when the signal intensity value of the electric signal is smaller than the preset signal intensity threshold value, the comparison module 2 does not output any signal or outputs a normal signal for indicating that the current frequency converter works normally.
In this embodiment, specifically, in an application scenario applied to the frequency converter, when the light intensity detection module 1 is installed and used, the light intensity detection module 1 is placed in a designated area of the frequency converter that needs to be monitored, for example, the light intensity detection module 1 is directly opposite to a bus area of the frequency converter, which is prone to arc discharge failure. In the monitoring process, the light intensity detection module 1 can output an electric signal which is in direct proportion to the detected ambient light intensity, wherein when the frequency converter is in a normal state, the ambient light intensity of the environment where the light intensity detection module 1 is located is weaker, and the electric signal output by the light intensity detection module 1 is weaker at the moment; when the frequency converter has an arc discharge fault, the environment of the light intensity detection module 1 can generate strong arc light, and the arc light with strong light intensity irradiates the light intensity detection module 1, so that the output electric signal of the light intensity detection module is obviously increased. Therefore, a certain signal intensity threshold value can be set in the comparison module 2 in advance, so that only when an arc discharge fault occurs, the strong arc light can trigger the arc discharge fault detection device to output a fault signal, and common ambient light cannot trigger the arc discharge fault detection device to output the fault signal, so that the arc discharge fault detection device of the embodiment has good reliability and anti-interference performance.
The arc discharge fault detection device provided by the embodiment utilizes the characteristic that a frequency converter can emit strong light when an arc discharge fault occurs, the light intensity detection module 1 is arranged to detect the ambient light intensity in an area where the arc discharge fault easily occurs, the light intensity detection module 1 converts a detected light intensity signal into a corresponding electric signal and outputs the electric signal to the comparison module 2, the comparison module 2 receives the electric signal output by the light intensity detection module 1 and judges whether the signal intensity value of the electric signal is greater than a preset signal intensity threshold value, if so, a fault signal for indicating that the arc discharge fault occurs in the current frequency converter is output, thereby realizing the real-time monitoring of the arc discharge fault problem, being convenient for timely adopting corresponding measures to avoid the occurrence of safety accidents when the arc discharge fault occurs in the frequency converter, for example, the fault signal can be output to a master control unit of an upper computer or the frequency converter, therefore, the main control unit of the upper computer or the frequency converter can adopt protection strategies such as automatic alarming, automatic power supply cutting and the like in time, and safety accidents can be effectively avoided when arc discharge faults occur.
Further, referring to fig. 1 and fig. 2, in an exemplary embodiment, the light intensity detecting module 1 specifically includes:
a light intensity detection unit 11 for detecting the ambient light intensity in the designated area and converting the detected light intensity signal into a current signal;
a signal conversion unit 12 for converting the current signal into a voltage signal;
the signal amplifying unit 13 is configured to amplify the voltage signal and output the amplified voltage signal to the comparing module 2.
In this embodiment, in practical implementation, the light intensity detecting unit 11 may be a photodiode, a phototransistor, or another photoelectric conversion element capable of detecting light intensity, the signal converting unit 12 may be a series resistor, and the signal amplifying unit 13 may be a general amplifying circuit. Specifically, the light intensity detection unit 11 may output a current signal proportional to the detected light intensity according to the light intensity of the environment where the light intensity detection unit 11 is located, when the frequency converter is in a normal state, the light intensity of the environment where the light intensity detection unit 11 is located is weak, and at this time, the current signal output by the light intensity detection unit 11 is small; when the frequency converter has an arc discharge fault, the environment of the light intensity detection unit 11 generates strong arc light, and the arc light with strong light intensity irradiates the light intensity detection unit 11, so that the current signal output by the light intensity detection unit is obviously increased. Since the signal output by the light intensity detecting unit 11 is a weak current signal and is difficult to be directly used, the current signal needs to be converted, specifically, the current signal is converted into a voltage signal by the signal converting unit 12, and the voltage signal is amplified by the signal amplifying unit 13 in a certain proportion, so that the subsequent comparing module 2 can conveniently identify the current signal.
Further, referring to fig. 1 and 2, in an exemplary embodiment, the comparing module 2 includes:
a comparing unit 21 for comparing a voltage value of the voltage signal with a preset voltage threshold, and outputting a fault signal when the voltage value is greater than the preset voltage threshold; the fault signal is a high level signal or a low level signal.
In the present embodiment, since the voltage signal output by the signal conversion unit 12 is positively correlated with the light intensity detected by the light intensity detection unit 11, a voltage threshold may be set in advance for the comparison unit 21, so that, in the monitoring process, when the comparison unit 21 receives the voltage signal output by the signal amplification unit 13, the comparison unit 21 compares the voltage value of the voltage signal with the voltage threshold, and when the voltage value is smaller than the voltage threshold, the comparison unit 21 does not act or outputs a low level signal (assuming that the fault signal is at a high level) indicating that the current inverter is working normally; when the voltage value is greater than the voltage threshold, the comparison unit 21 outputs a fault signal in the form of a high level to prompt that the current frequency converter of the main control unit of the upper computer or the frequency converter has an arc discharge fault, so that the main control unit of the upper computer or the frequency converter can adopt a corresponding protection strategy in time.
Further, referring to fig. 1 and 2, in an exemplary embodiment, the comparing module 2 further includes:
and the signal conditioning unit 22 is used for converting the fault signal into a corresponding digital signal and outputting the digital signal.
In this embodiment, considering that the electromagnetic environment in the frequency converter is relatively complex, in some application scenarios requiring long-distance signal transmission, if the signal is a fault signal in the form of an electrical signal, the fault signal will be greatly interfered in the output process to affect subsequent identification, so that the fault signal is conditioned by the signal conditioning unit 22 before being output, and is converted into a digital signal with strong anti-interference capability and easy transmission and identification, for example, a universal 4-20mA current transmission mode in the field of sensors can be adopted for conditioning, or a universal 24V level digital quantity output mode can be adopted for conditioning, so that the arc discharge fault detection apparatus of this embodiment can be more conveniently applied to existing frequency converter products. In a specific implementation, the signal conditioning unit 22 may be a dedicated integrated chip, or may be a signal conversion circuit composed of discrete electronic devices, as long as the signal conversion circuit can convert a fault signal in the form of an electrical signal into a corresponding digital signal, which is not limited in this embodiment.
Further, referring to fig. 1 and 2, in an exemplary embodiment, the arc fault detection apparatus further includes a printed circuit board 3, the light intensity detection module 1 and the comparison module 2 are both fixed on the printed circuit board 3, and the light intensity detection module 1 is electrically connected to the comparison module 2 through the printed circuit board 3.
In this embodiment, by arranging the printed circuit board 3 and integrating the light intensity detection module 1 and the comparison module 2 on the printed circuit board 3, not only can the fixation of each functional element be facilitated, but also the improvement of the integration level of the arc discharge fault detection device is facilitated, and the installation and the use are convenient. In specific implementation, the light intensity detection unit 11 can be fixed on the printed circuit board 3 by soldering, and the signal conversion unit 12, the signal amplification unit 13, the comparison unit 21 and the signal conditioning unit 22 can be integrated into a whole by packaging and fixed on the printed circuit board 3 by soldering, wherein the packaging form can be various, and can be a packaging form of two pins or three or more pins; the light intensity detecting unit 11 can be electrically connected to the packaged signal converting unit 12 through a lead on the printed circuit board 3.
Further, the arc fault detection device may need to be installed at different positions of the frequency converter according to different detection performance requirements, for example, when the arc fault detection device is close to the control circuit board 51 of the frequency converter (i.e. the main control unit of the frequency converter), the arc fault detection device is preferably fixed on the control circuit board 51 of the frequency converter by means of welding, and based on this, referring to fig. 4, in an exemplary embodiment, the printed circuit board 3 is provided with a plurality of pads 31. So, through set up pad 31 on printed circuit board 3 for whole arc fault detection device accessible welded mode is connected with the control circuit board 51 of converter (being the main control unit of converter), thereby, not only make things convenient for whole arc fault detection device's installation, realize fault signal's short distance transmission through the welded mode moreover, when having saved the use of cable, also simplified the regulation to fault signal (can save the setting of signal conditioning unit 22 this moment promptly), thereby be favorable to reducing arc fault detection device's use cost.
Further, the arc fault detection device may need to be installed at different positions of the frequency converter according to different detection performance requirements, for example, when the arc fault detection device is far away from the control circuit board 51 of the frequency converter, the arc fault detection device is preferably installed on the housing of the frequency converter in an adjustable fixing manner, based on this, referring to fig. 3, in another exemplary embodiment, the arc fault detection device further includes a signal line 4, and the printed circuit board 3 is further provided with a plurality of screw installation holes 32, wherein one end of the signal line 4 is fixed on the pad 31 and electrically connected with the pad 31 (specifically, one end of the signal line 4 is welded with the pad 31). So, through set up screw mounting hole 32 on printed circuit board 3 for whole arc fault detection device mounted position on converter casing 6 can be adjusted according to actual need is nimble (when specifically installing and using, the accessible is fixed whole arc fault detection device on converter casing 6 towards the mode of screw mounting hole 32 screwing up set screw 7), and accessible signal line 4 supplies power and carries out fault signal's long distance transmission this moment to arc fault detection device. During specific implementation, the signal line 4 and the high-voltage side of the frequency converter need to meet the requirement of corresponding safety distance, and the other end of the signal line 4 can be connected to an external input/output terminal universal for the frequency converter or an upper computer, so that the arc discharge fault detection device of the embodiment can have good compatibility.
Correspondingly, referring to fig. 1 to 4, an embodiment of the present invention further provides an arc discharge fault detection system, where the arc discharge fault detection system includes a main control module 5, a power supply module (not shown in the figure) at least used for supplying power to a frequency converter, and an arc discharge fault detection apparatus in any of the above embodiments, where the main control module 5 is electrically connected to the power supply module and the comparison module 2, respectively; when the main control module 5 receives the fault signal output by the comparison module 2, the main control module 5 controls the power supply module to stop supplying power to the frequency converter. The main control module 5 is a control circuit board 51 of an upper computer or a frequency converter.
In this embodiment, thanks to the improvement of the arc discharge fault detection device, the arc discharge fault detection system of this embodiment has the same technical effect as the arc discharge fault detection device, and is not described herein again.
Correspondingly, referring to fig. 5, an embodiment of the present invention further provides an arc discharge fault detection method, where the arc discharge fault detection method includes the following steps:
step S11, detecting the environmental light intensity in the appointed area, and converting the detected light intensity signal into a current signal;
step S12, converting the current signal into a voltage signal, and amplifying the voltage signal;
step S13, comparing the voltage value of the amplified voltage signal with a preset voltage threshold, and determining whether the voltage value is greater than the preset voltage threshold;
if yes, step S14 is executed to output a failure signal.
The arc discharge fault detection method of the embodiment utilizes the characteristic that the frequency converter can emit strong light when the arc discharge fault occurs, and can realize the real-time monitoring of the arc discharge fault problem based on the steps, so that corresponding measures can be taken in time to avoid the occurrence of safety accidents when the frequency converter has the arc discharge fault. It should be noted that, for a specific implementation manner of the arc discharge fault detection method according to this embodiment, reference may be made to the description about the arc discharge fault detection apparatus embodiment, and details are not described here again.
It should be noted that other contents of the arc fault detection device, system and method disclosed in the present invention can be referred to in the prior art, and are not described herein again.
In addition, it should be noted that the technical solutions in the embodiments may be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of the technical solutions should be considered to be absent and not to be within the protection scope of the present invention.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An arcing fault detection apparatus, comprising:
the light intensity detection module is used for detecting the ambient light intensity in the designated area and converting the detected light intensity signal into an electric signal;
and the comparison module is used for comparing the signal intensity value of the electric signal with a preset signal intensity threshold value, and outputting a fault signal when the signal intensity value of the electric signal is greater than the preset signal intensity threshold value.
2. The arcing fault detection device of claim 1, wherein the light intensity detection module comprises:
the light intensity detection unit is used for detecting the ambient light intensity in the designated area and converting the detected light intensity signal into a current signal;
the signal conversion unit is used for converting the current signal into a voltage signal;
and the signal amplifying unit is used for amplifying the voltage signal and outputting the amplified voltage signal to the comparison module.
3. The arcing fault detection apparatus of claim 2, wherein the comparison module comprises:
the comparison unit is used for comparing the voltage value of the voltage signal with a preset voltage threshold value and outputting the fault signal when the voltage value is larger than the preset voltage threshold value; wherein the fault signal is a high level signal or a low level signal.
4. The arcing fault detection apparatus of claim 3, wherein the comparison module further comprises:
and the signal conditioning unit is used for converting the fault signal into a corresponding digital signal and outputting the digital signal.
5. The drawn arc fault detection device according to any one of claims 1 to 4, further comprising a printed circuit board, wherein the light intensity detection module and the comparison module are both fixed on the printed circuit board, and the light intensity detection module is electrically connected with the comparison module through the printed circuit board.
6. The arcing fault detection device of claim 5, wherein a plurality of pads and/or a plurality of screw mounting holes are disposed on the printed circuit board.
7. The drawn arc fault detection device according to claim 6, further comprising a signal line having one end fixed to the pad and electrically connected to the pad.
8. An arc discharge fault detection system, characterized in that, the arc discharge fault detection system comprises a main control module, a power supply module at least used for supplying power for a frequency converter, and the arc discharge fault detection device according to any one of claims 1 to 7, wherein the main control module is respectively electrically connected with the power supply module and the comparison module; when the master control module receives the fault signal output by the comparison module, the master control module controls the power supply module to stop supplying power to the frequency converter.
9. The arc discharge fault detection system of claim 8, wherein the master control module is an upper computer or a control circuit board of the frequency converter.
10. The arc discharge fault detection method is characterized by comprising the following steps:
detecting the ambient light intensity in the designated area, and converting the detected light intensity signal into a current signal;
converting the current signal into a voltage signal, and amplifying the voltage signal;
comparing the voltage value of the amplified voltage signal with a preset voltage threshold value, and judging whether the voltage value is greater than the preset voltage threshold value;
and if the voltage value is larger than the preset voltage threshold value, outputting a fault signal.
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