CN111913041A - Alternating current switch cabinet arc light detection system and method thereof - Google Patents
Alternating current switch cabinet arc light detection system and method thereof Download PDFInfo
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- CN111913041A CN111913041A CN202010909808.7A CN202010909808A CN111913041A CN 111913041 A CN111913041 A CN 111913041A CN 202010909808 A CN202010909808 A CN 202010909808A CN 111913041 A CN111913041 A CN 111913041A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
- G01R23/167—Spectrum analysis; Fourier analysis using filters with digital filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- Testing Relating To Insulation (AREA)
Abstract
The invention discloses an alternating current switch cabinet arc light detection system and method, and relates to the field of switch cabinets. In the invention: the arc light probe 1 collects light signals in the switch cabinet and transmits the light signals to an ADC pin of the comparator and the processor through the photoelectric conversion unit; the comparator compares the received voltage signal with a preset reference voltage and transmits a comparison result to the processor; and the processor judges according to the comparison result of the comparator or the information data acquired and processed by the ADC pin. The arc light probe is adopted to detect light signals in the switch and then respectively transmit the light signals to the ADC pins of the comparator and the processor, the arc light signals are compared with the preset reference voltage through the comparator, rapid detection of strong arc light faults is realized, the arc light signals are processed through the processor, signal analysis is carried out on a frequency domain by utilizing the characteristic that the intensity of the arc light is periodically changed, detection of weak arc light is realized, and the anti-interference capability is strong.
Description
Technical Field
The invention belongs to the technical field of switch cabinets, and particularly relates to an alternating current switch cabinet arc light detection system and method.
Background
Middle and low voltage switch cabinets operate in months for a long time, and electrical faults are easily caused by the conditions of environmental pollution, insulation damage, loosening of joints and the like in the cabinets and are often accompanied by arc lights with different intensities. For the reinforcing security performance, dispose arc light protection system in the cubical switchboard of some important occasions, realize quick fault detection and excision through arc light detection, compare in traditional overcurrent protection device and can shorten the protection action time greatly, reduce the loss that equipment damage and power failure brought.
Generally, the arc protection system comprises a plurality of arc probes for collecting light, a visible light arc probe and an ultraviolet light arc probe are mainstream, and light signals collected by the arc probes are transmitted to a photoelectric conversion module through optical fibers and converted into electric signals. The system judges whether the system has fault arc light by judging whether the intensity of the electric signal exceeds a preset threshold value, and then determines whether to cut off the power supply at a corresponding position.
The threshold value of arc detection must be higher than the illumination and lighting intensity of the installation environment, and sufficient margin is needed to avoid false operation. Generally, when a short-circuit fault of the switch cabinet occurs, the arc light is strong and easy to detect. However, the arc light of a part of high-resistance ground fault or non-short circuit type arc fault is weak, and the phenomenon of leakage detection is easy to occur. Moreover, the arc probe 1 has a certain detection angle, and when the angle deviates from a fault point, the detection leakage is easy to occur, so that great potential safety hazard exists. Electrical faults like weak arc, long duration, heat build up, often causing severe faults and causing significant losses. The performance of the arc light detection system is improved, and the detection capability of weak arc light is enhanced, so that the arc light detection system has practical value.
In order to ensure that the arc light detection device has the detection capability of weak arc light on the premise of not causing misoperation under normal illumination, the safety performance of the system is enhanced; an alternating current switch cabinet arc light detection system and a method thereof are designed at present, and the working principle is as follows: in an alternating current switch cabinet, voltage and current run at a specific frequency f, an arc accompanying an electrical fault also has corresponding time characteristics, the light power of an arc pulse changes at the frequency of 2f, the peak value of the intensity of the arc greatly differs with different events, but the frequency characteristic of 2f always exists. The invention utilizes the characteristic of periodic change of the arc intensity to analyze signals from a frequency domain so as to achieve the aim of arc detection.
Disclosure of Invention
The invention aims to provide an arc light detection system and method for an alternating current switch cabinet, which are characterized in that light signals in a switch are detected by an arc light probe and then are respectively transmitted to a comparator and an ADC pin of a processor, the arc light signals are compared with a preset reference voltage by the comparator, the rapid detection of strong arc light faults is realized, the arc light signals are processed by the processor, the characteristic of periodic change of the intensity of the arc light is utilized, the signal analysis is carried out from a frequency domain, the detection of weak arc light is realized, and the anti-interference capability is strong.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an arc light detection system and method for an alternating current switch cabinet, wherein the arc light detection system comprises an arc light probe 1 and a detection device, and the arc light probe 1 transmits an induced signal to the detection device for detection; the detection device comprises a low-pass filter, a comparator and a processor; the arc light probe 1 collects light signals in the switch cabinet and transmits the light signals to the photoelectric conversion module; the photoelectric conversion module converts the received optical signal into an electric signal and transmits the electric signal to the low-pass filter;
the low-pass filter filters the received signals and then respectively transmits the signals to the comparator and an ADC pin of the processor;
the comparator compares the received voltage signal with a preset reference voltage and transmits a comparison result to the processor;
the processor acquires data information transmitted by the low-pass filter through an ADC pin; the ADC pin samples a signal at a certain sampling frequency fc and converts the signal into a digital signal; after a certain amount of Nc data are collected, performing fast Fourier transform;
the processor judges according to the comparison result of the comparator or the information data acquired and processed by the ADC pin;
the processor is also connected with the circuit breaker, the LED lamp and the communication module; the processor controls the switch of the circuit breaker, the processor controls the LED lamp to display arc faults, and the processor performs information interaction with the upper computer through the communication module.
Further, the detection device is electrically connected with a power module, and the power module is used for supplying power to the detection device.
An alternating current switch cabinet arc light detection method comprises the following steps:
the method comprises the following steps: presetting a second threshold TH2 in the processor; the second ADC module samples the fc arc light signal at a certain frequency;
step two: the data volume sampled by the ADC reaches a certain value Nc; carrying out fast Fourier transform on the Nc data to obtain the signal amplitudes of a plurality of frequency points near the grid frequency and the frequency doubling; adding the acquired amplitude data of a plurality of frequency points and calculating the average value of the amplitude data, and recording the average value as sigma 1;
step three: comparing the sigma 1 with a preset second threshold value TH2, wherein the characteristic of arc-conforming events is marked when the sigma 1 is larger than TH 2;
step four: if the results of the third step accord with the arc light characteristics, the processor judges that an arc light fault occurs, and the processor controls the circuit breaker to cut off the power supply and gives an alarm;
step five: and if the result of the third step does not accord with the arc light characteristic, returning to the first step.
The invention has the following beneficial effects:
the arc light probe 1 is adopted to detect light signals in the switch and then respectively transmit the light signals to the ADC pins of the comparator and the processor, the arc light signals are compared with the preset reference voltage through the comparator, rapid detection of strong arc light faults is realized, the arc light signals are processed through the processor, signal analysis is carried out on a frequency domain by utilizing the characteristic of periodic change of the intensity of the arc light, detection of weak arc light is realized, and the anti-interference capability is strong.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a system block diagram of an AC switchgear arc light detection system;
FIG. 2 is a flow chart of an AC switchgear arc light detection method;
FIG. 3 is a block diagram of an AC switchgear arc detection system with the addition of a reference probe;
FIG. 4 is a flow chart of an AC switchgear arc detection method with the addition of a reference probe.
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 description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
Referring to fig. 1, the invention is an arc testing system for an ac switchgear, comprising an arc probe 1 and a testing device, wherein the arc probe 1 transmits a sensed signal to the testing device for testing; the detection device comprises a low-pass filter, a comparator and a processor; the arc light probe 1 collects light signals in the switch cabinet and transmits the light signals to the photoelectric conversion module; the photoelectric conversion module converts the received optical signal into an electric signal and transmits the electric signal to the low-pass filter;
the low-pass filter filters the received signals and then respectively transmits the signals to the comparator and an ADC pin of the processor;
the comparator compares the received voltage signal with a preset reference voltage and transmits a comparison result to the processor;
the processor acquires data information transmitted by the low-pass filter through an ADC pin; an ADC pin samples a signal at a certain sampling frequency fc and converts the signal into a digital signal; after a certain amount of Nc data are collected, performing fast Fourier transform;
the processor judges according to the comparison result of the comparator or the information data acquired and processed by the ADC pin;
the detection device is electrically connected with the power supply module, and the power supply module is used for supplying power to the detection device; the processor is also connected with the circuit breaker, the LED lamp and the communication module; the processor controls the switch of the circuit breaker, the processor controls the LED lamp to display arc faults, and the processor performs information interaction with the upper computer through the communication module.
As shown in fig. 2, an arc light detection method for an ac switchgear includes the following steps:
the method comprises the following steps: presetting a second threshold TH2 in the processor; the second ADC module samples the fc arc light signal at a certain frequency; where fc is set to 4kHz
Step two: the data amount sampled by the ADC reaches a certain value Nc, where Nc is set to 1024; carrying out fast Fourier transform on the Nc data to obtain the signal amplitudes of a plurality of frequency points near the grid frequency and the frequency doubling; here, the amplitude data of the 14 th, 15 th, 16 th, 26 th, 27 th and 28 th frequency points (representing 46.9Hz, 50.8Hz, 54.7Hz, 97.7Hz, 101.6Hz and 105.5Hz) are selected, added and averaged, and is recorded as Σ 1;
step three: comparing the sigma 1 with a preset second threshold value TH2, and recording the characteristic of conforming to the arc event when the sigma 1 is larger than TH 2;
step four: if the results of the third step accord with the arc light characteristics, the processor judges that an arc light fault occurs, and the processor controls the circuit breaker to disconnect the power supply and give an alarm;
step five: and if the result of the third step does not accord with the arc light characteristic, returning to the first step.
The first embodiment is as follows:
as shown in fig. 3-4, the arc detection system for the ac switch cabinet in the embodiment includes an arc probe 1, an arc probe 2 and a detection device, wherein the arc probe 1 collects light signals in the switch cabinet and transmits the light signals to the photoelectric conversion module; the photoelectric conversion module converts the received optical signal into an electric signal and transmits the electric signal to the low-pass filter;
the arc light probe 2 is arranged outside the switch cabinet, and external light is collected by the arc light probe 2 and is transmitted to the detection device as a reference signal; the low-pass filter filters the received signals and then respectively transmits the signals to the comparator and an ADC pin of the processor; the comparator compares the received voltage signal with a preset reference voltage and transmits a comparison result to the processor;
the processor acquires data information transmitted by the low-pass filter through an ADC pin; an ADC pin samples a signal at a certain sampling frequency fc and converts the signal into a digital signal; after a certain amount of Nc data are collected, performing fast Fourier transform;
the processor judges according to the comparison result of the comparator or the information data acquired and processed by the ADC pin;
the detection device is electrically connected with the power supply module, and the power supply module is used for supplying power to the detection device; the processor is also connected with the circuit breaker, the LED lamp and the communication module; the processor controls the switch of the circuit breaker, the processor controls the LED lamp to display arc light detection data, and the processor performs information interaction with the upper computer through the communication module.
As shown in fig. 4, the present embodiment is an arc testing method for an ac switchgear, including the following steps:
step 1: the ADC module samples the fc arc light signal at a certain frequency, and the reference channel and the normal detection channel synchronously sample;
step 2: sampling data of each channel reach a set value Nc at the same time, performing fast Fourier transform on the data of the reference arc channel, acquiring signal amplitudes of a plurality of frequency points near the frequency and the frequency doubling of the power grid, and calculating the average value of the data, and recording the average value as sigma 2;
and step 3: adjusting a second threshold value TH2 according to the value of Sigma 2, wherein TH2 is used for judging whether the arc signal has arc characteristics;
and 4, step 4: carrying out fast Fourier transform on the sampling data of the normal arc detection channel, and calculating an average value by referring to the operation in the step 2, and recording the average value as sigma 1;
and 5: comparing with a sigma 1 threshold TH2, and recording the characteristic of conforming to the arc event when the second sigma 1 is larger than TH 2;
step 6: if the result in the step 5 accords with the arc light characteristics, the system judges that the arc light fault occurs, gives an alarm and executes corresponding protective measures;
and 7: and if the result of the step 6 does not accord with the arc characteristic, returning to the step 1.
The "adjusting the second threshold TH2 according to the value of Σ 2" mentioned in step 3 is further explained. By the occasional light source outside the cabinet entering the cabinet through the gap, we can characterize the "noise floor" it forms on the in-cabinet detection probe by a certain attenuation scaling factor k, where TH2 ═ C + k ∑ 2 is used to correct TH 2. Where C is a fixed constant, and C and k are obtained experimentally in advance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (3)
1. An arc light detection system of an alternating current switch cabinet comprises an arc light probe 1 and a detection device, wherein the arc light probe 1 transmits a sensed signal to the detection device for detection; the detection device comprises a low-pass filter, a comparator and a processor; the method is characterized in that: the arc light probe 1 collects light signals in the switch cabinet and transmits the light signals to the photoelectric conversion module; the photoelectric conversion module converts the received optical signal into an electric signal and transmits the electric signal to the low-pass filter;
the low-pass filter filters the received signals and then respectively transmits the signals to the comparator and an ADC pin of the processor;
the comparator compares the received voltage signal with a preset reference voltage and transmits a comparison result to the processor; when the voltage signal received by the comparator exceeds the reference voltage, the level signal transmitted to the processor by the comparator is inverted, and the processor judges that an arc event occurs;
the processor acquires data information transmitted by the low-pass filter through an ADC pin; the ADC pin samples a signal at a certain sampling frequency fc and converts the signal into a digital signal; after a certain amount of Nc data are collected, performing fast Fourier transform;
the processor judges according to the comparison result of the comparator or the information data acquired and processed by the ADC pin;
the processor is also connected with the circuit breaker, the LED lamp and the communication module; the processor controls the switch of the circuit breaker, the processor controls the LED lamp to display arc faults, and the processor performs information interaction with the upper computer through the communication module.
2. The alternating current switchgear arc detection system of claim 1, wherein the detection device is electrically connected to a power module, and the power module is used for supplying power to the detection device.
3. The arc light detection method for the alternating current switch cabinet is characterized by comprising the following steps of:
the method comprises the following steps: presetting a second threshold TH2 in the processor; the second ADC module samples the fc arc light signal at a certain frequency;
step two: the data volume sampled by the ADC reaches a certain value Nc; carrying out fast Fourier transform on the Nc data to obtain the signal amplitudes of a plurality of frequency points near the grid frequency and the frequency doubling; adding the acquired amplitude data of a plurality of frequency points and calculating the average value of the amplitude data, and recording the average value as sigma 1;
step three: comparing the sigma 1 with a preset second threshold value TH2, wherein the characteristic of arc-conforming events is marked when the sigma 1 is larger than TH 2;
step four: if the results of the third step accord with the arc light characteristics, the processor judges that an arc light fault occurs, and the processor controls the circuit breaker to cut off the power supply and gives an alarm;
step five: and if the result of the third step does not accord with the arc light characteristic, returning to the first step.
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| CN202010909808.7A CN111913041A (en) | 2020-09-02 | 2020-09-02 | Alternating current switch cabinet arc light detection system and method thereof |
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| CN113687116A (en) * | 2021-08-11 | 2021-11-23 | 苏州汇川控制技术有限公司 | Arc discharge fault detection device, system and method |
| CN113991615A (en) * | 2021-10-19 | 2022-01-28 | 国网江苏省电力有限公司无锡供电分公司 | Critical arc light phase-locking judgment method and device |
| CN114156830A (en) * | 2021-11-22 | 2022-03-08 | 昆明理工大学 | Arc light protection method and device for photo-electromagnetic synchronous fusion detection |
| EP4137827A1 (en) * | 2021-08-17 | 2023-02-22 | QIT Co., Ltd | Self-checking method and apparatus of arc detection device in power system |
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| EP4137827A1 (en) * | 2021-08-17 | 2023-02-22 | QIT Co., Ltd | Self-checking method and apparatus of arc detection device in power system |
| CN113991615A (en) * | 2021-10-19 | 2022-01-28 | 国网江苏省电力有限公司无锡供电分公司 | Critical arc light phase-locking judgment method and device |
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Application publication date: 20201110 |