CN117686832A - Cable detection system, control method and control device for cable detection system - Google Patents
Cable detection system, control method and control device for cable detection system Download PDFInfo
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Abstract
The application provides a cable detection system, a control method and a control device of the cable detection system. The method comprises the following steps: the cable comprises an air taking interface; the air pump is communicated with the air taking interface of the cable through an air pipe and is used for extracting air; the hydrogen sensor is communicated with the air pump through the air pipe and is used for detecting the concentration of hydrogen in the gas; and the processing equipment is electrically connected with the hydrogen sensor and is used for determining the ablation degree of the cable at least according to the concentration of the hydrogen, wherein the concentration and the ablation degree are in positive correlation. The high-voltage cable water-blocking buffer layer generates hydrogen when ablated, and the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be collected, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect detection efficiency of the high-voltage cable water-blocking buffer layer is low in the prior art is solved.
Description
Technical Field
The application relates to the technical field of cable detection, in particular to a cable detection system, a control method and a control device of the cable detection system.
Background
The high-voltage cable is core power transmission equipment in the power system, and the operation reliability of the high-voltage cable is important for maintaining the safety and stability of the urban power grid and guaranteeing the normal operation of urban functions. The buffer layer ablation defect in the 110kV and above voltage class high-voltage XLPE insulated cable is specifically expressed as follows: the buffer layer and the inner wall of the aluminum sheath have burn phenomena, the buffer layer and the insulating shielding layer have white spots and discharge marks, when the defects are serious, the buffer layer has obvious ablation holes, the buffer water blocking and uniform electric field effects of the buffer layer are destroyed, the ablation defects of the buffer layer seriously damage the safe and stable operation of the cable, the reliability of electric energy transmission is reduced, and the service life of the cable is greatly shortened. The state of the water-blocking buffer layer of the high-voltage cable is monitored, the ablation defect is diagnosed, the cable defect can be found in advance, effective measures can be taken timely, the defect hazard is reduced, and the safe operation of the power cable is ensured.
The existing method for detecting the ablation defect of the water-blocking buffer layer of the high-voltage cable mainly comprises partial discharge and X-ray detection. However, the detection of partial discharge is easily affected by ambient noise, and the partial discharge of the buffer layer is intermittent discharge, the discharge period is not fixed, and it is difficult to form a partial discharge signal conforming to the characteristics of the map. The X-ray mainly detects the white spot of the buffer layer, the ablation condition can not be detected, the detection sensitivity is low, and the practical application is influenced by the cable operation environment. Therefore, the ablation defect detection efficiency of the water-blocking buffer layer of the current high-voltage cable is lower.
Disclosure of Invention
The main object of the present application is to provide a cable detection system, a control method and a control device for the cable detection system, so as to at least solve the problem in the prior art that the efficiency of ablation defect detection of a water-blocking buffer layer of a high-voltage cable is low.
To achieve the above object, according to one aspect of the present application, there is provided a cable detection system including: the cable comprises an air taking interface; the air pump is communicated with the air taking interface of the cable through an air pipe and is used for extracting air; the hydrogen sensor is communicated with the air pump through an air pipe and is used for detecting the concentration of hydrogen in the gas; and the processing equipment is electrically connected with the hydrogen sensor and is used for determining the ablation degree of the cable at least according to the concentration of the hydrogen, wherein the concentration and the ablation degree are in positive correlation.
Optionally, the cable detection system further comprises: the temperature and humidity sensor is used for detecting the gas temperature and the gas humidity of the gas; and the air pressure sensor is used for detecting the air pressure of the air.
Optionally, the cable detection system further comprises: the infrared thermometer is used for detecting the cable temperature of the cable; and the current sensor is used for detecting the current of the cable.
Optionally, the cable detection system further comprises: the pretreatment device is communicated with the air pump through an air pipe and is used for drying the air; an infrared spectrometer for determining the composition of the gas.
Optionally, the cable detection system further comprises: the gas tank comprises a gas inlet and a gas outlet, the gas inlet is communicated with the gas pump through a gas pipe, the gas outlet outputs gas to an external space through the gas pipe, and the gas tank is used for storing the gas.
According to another aspect of the present application, there is provided a control method of the cable detection system of any one of the above, the method including: acquiring spectrum data, wherein the spectrum data is the absorption intensity of the gas to light; determining the concentration of the hydrogen gas from the spectral data; the extent of ablation of the cable is determined based at least on the concentration of the hydrogen gas.
Optionally, determining the concentration of the hydrogen gas from the spectral data comprises: determining the concentration according to a target formula, wherein the target formula is:
wherein A represents absorbance, I 0 Representing the intensity of incident monochromatic light, I t The projected light intensity, T, transmittance, K, molar absorption coefficient, l, medium thickness, and c represent the concentration.
Optionally, the cable detection system further includes a temperature and humidity sensor, a gas pressure sensor and an infrared spectrometer, the temperature and humidity sensor is used for detecting a gas temperature and a gas humidity of the gas, the gas pressure sensor is used for detecting a gas pressure of the gas, the infrared spectrometer is used for determining a component of the gas, and before acquiring the spectrum data, the method further includes: acquiring the gas temperature, the gas humidity and the gas pressure; and calibrating the infrared spectrometer according to the gas temperature, the gas humidity and the gas pressure.
Optionally, the cable detection system further includes an infrared thermometer for detecting a cable temperature of the cable and a current sensor for detecting a current of the cable, and before acquiring the spectral data, the method further includes: acquiring the temperature of the cable; determining the position of the maximum value of the cable temperature as the position of the air taking interface; acquiring the concentration of the hydrogen at the gas extraction interface and the current at the gas extraction interface; in the event that the concentration is greater than a concentration threshold and/or the current is greater than a current threshold, it is determined that the cable has ablated.
According to still another aspect of the present application, there is provided a control device of the cable detection system of any one of the above, the device comprising: a first acquisition unit configured to acquire spectral data, where the spectral data is an absorption intensity of the gas for light; a first determining unit configured to determine the concentration of the hydrogen gas from the spectral data; a second determining unit for determining said degree of ablation of said cable based at least on said concentration of said hydrogen gas.
By applying the technical scheme, hydrogen is generated when the high-voltage cable water-blocking buffer layer is ablated, and the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be acquired, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect detection efficiency of the high-voltage cable water-blocking buffer layer in the prior art is low is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 shows a schematic diagram of the cable detection system of the present application;
FIG. 2 shows a schematic diagram of the detection principle of the cable detection system of the present application;
fig. 3 is a block diagram showing a hardware configuration of a mobile terminal performing a control method of a cable detection system according to an embodiment of the present application;
FIG. 4 is a flow chart of a control method of a cable detection system according to an embodiment of the present application;
FIG. 5 is a flow chart of another method of controlling a cable detection system;
fig. 6 shows a block diagram of a control device of a cable detection system according to an embodiment of the present application.
Wherein the above figures include the following reference numerals:
102. a processor; 104. a memory; 106. a transmission device; 108. an input-output device; 10. a cable; 11. an air taking interface; 12. an air pump; 13. a processing device; 14. a pretreatment device; 15. an infrared spectrometer; 16. and a gas pool.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, the efficiency of ablation defect detection of the water-blocking buffer layer of the high-voltage cable in the prior art is low, and in order to solve the problems, the embodiment of the application provides a cable detection system, a control method of the cable detection system and a control device of the cable detection system.
The present application also provides a cable detection system, as shown in fig. 1 and 2, including:
a cable 10 comprising an air intake interface 11;
An air pump 12 which is communicated with the air taking interface of the cable through an air pipe and is used for extracting air;
a hydrogen sensor which is communicated with the air pump through an air pipe and is used for detecting the concentration of hydrogen in the air;
and a processing device 13 electrically connected to the hydrogen sensor, wherein the processing device is configured to determine an ablation level of the cable based at least on the concentration of the hydrogen, and wherein the concentration and the ablation level are in a positive correlation.
In the system, hydrogen is generated when the high-voltage cable water-blocking buffer layer is ablated, and the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be acquired, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect detection efficiency of the high-voltage cable water-blocking buffer layer in the prior art is low is solved.
According to the scheme, rapid on-line monitoring of multi-component gas can be realized, the anti-interference capability is strong, and the field practicability is good.
In addition, as shown in fig. 2, the system further includes a power source, which can supply power to each device. The outdoor 220V mobile power supply with the peak power of 1000W and the capacity of 2kWh can be powered by a storage battery, the size is 190 x 260 x 190mm, and the net weight is 5kg. The entire system may be powered for about 4 hours. The system provides power for the whole system and can be applied to power supply of cable well sites.
The system also comprises an air taking valve, wherein the air taking valve has a switching function, and the installation does not influence the normal operation and use of the cable. And (3) punching and installing an air taking valve at the crest of the cable corrugated aluminum sheath, and taking air by using an air pump.
The sealing treatment is carried out at the joints of all the equipment. The cable of the application is a high voltage 110kV crosslinked polyethylene cable.
Specifically, after the system power supply and the data line are connected, the power supply of the equipment can be turned on. And sending the gas ablated by the cable buffer layer into a system for analysis through the gas transmission pipe to obtain the infrared absorption spectrum of the mixed gas to be tested. The spectrum data is transmitted to a computer/industrial personal computer (namely processing equipment) for processing through a serial port, and the developed gas analysis software is used for preprocessing and analyzing the spectrum to obtain the concentration of each component gas, and displaying and storing the concentration and the data.
The processing device processes the spectrum data of the Fourier infrared spectrometer, displays the infrared absorption spectrum and the real-time concentration of each gas, and specifically, the device can realize the following functions:
(1) Realizing the functions of gas component concentration display, infrared absorption spectrum display, detection state display and data storage;
(2) Parameter configuration, serial port scheduling, equipment state query and spectrometer control are realized based on hardware equipment such as a spectrometer and the like;
(3) Automatically storing the spectrum data and the concentration data into a D \test folder; dpt and.sp files are spectral data and txt files are concentration numbers.
The high-voltage cable is core power transmission equipment in the power system, and the operation reliability of the high-voltage cable is important for maintaining the safety and stability of the urban power grid and guaranteeing the normal operation of urban functions. In recent years, breakdown accidents of a high-voltage cable body caused by ablation of a water-blocking buffer layer frequently occur in large cities, the high-voltage cable body belongs to structural defects of cables, a large number of latent ablation defects are not exposed at present, a large number of economic losses are caused, and the high-voltage cable body tends to increase year by year. The state of the water-blocking buffer layer of the high-voltage cable is monitored, the ablation defect is diagnosed, the cable defect can be found in advance, effective measures can be taken timely, the defect hazard is reduced, and the safe operation of the power cable is ensured. The monitoring method and the diagnosis technology for researching the ablation defect of the water-blocking buffer layer of the high-voltage cable have great theoretical significance and application value.
When the high-voltage cable water-blocking buffer layer is ablated, gas is generated, and the gas is closely related to the degradation degree of the ablation defect of the buffer layer. The gaseous products of ablation and decomposition of the buffer layer accumulate over time, so that the method does not require partial discharge of the buffer layer during detection, and is more suitable for the long-term intermittent low-energy partial discharge generated by ablation of the buffer layer of a high-voltage cable.
In a specific implementation process, as shown in fig. 2, the cable detection system further includes a temperature and humidity sensor and a gas pressure sensor, where the temperature and humidity sensor is used to detect a gas temperature and a gas humidity of the gas; the air pressure sensor is used for detecting the air pressure of the air.
In this scheme, can adopt temperature and humidity sensor to detect the condition of the humiture of the buffer layer of cable, can adopt pressure sensor to detect the condition of the atmospheric pressure of the buffer layer of cable, and then can follow-up through the condition of the ablation of temperature and humidity and atmospheric pressure together come through many parameters analysis cable.
In a specific implementation process, as shown in fig. 2, the cable detection system further includes an infrared thermometer and a current sensor, where the infrared thermometer is used to detect a cable temperature of the cable; the current sensor is used for detecting the current of the cable.
In the scheme, the cable problem of the cable can be detected through the infrared thermometer, so that the temperature change and distribution condition caused by the ablation of the cable buffer layer can be measured, and the current of the cable can be detected through the current sensor, so that the current change condition caused by the ablation of the cable buffer layer can be measured.
Aiming at the defects of the existing high-voltage cable buffer layer ablation fault detection method and system, the scheme aims at providing a multi-parameter detection scheme for high-voltage cable buffer layer ablation fault diagnosis, can realize rapid on-line monitoring of multi-component gas, and provides a complete flow based on gas detection.
In addition, the temperature measurement resolution is less than 1 ℃, and the angle of view is not less than 90; the transmission impedance of the current detection sensor is more than 4mV/mA, the detection frequency is 1 kHz-50 MHz, and the sensitivity is not less than 20pC.
In order to ensure the accuracy of gas component detection, as shown in fig. 1 and 2, the cable detection system of the present application further includes a pretreatment device 14 and an infrared spectrometer 15, where the pretreatment device is communicated with the air pump through an air pipe, and the pretreatment device is used for drying the gas; infrared spectrometers are used to determine the composition of the above gases.
In the scheme, the water vapor in the gas inside the cable can be dried through the pretreatment device, the influence of water vapor absorption on the infrared spectrum measurement of the subsequent gas is avoided, the output end of the pretreatment device can be communicated with the infrared spectrometer, the infrared spectrometer can use the FTIR spectrometer, the infrared spectrum scanning can be carried out on the multicomponent gas after pretreatment, infrared absorption spectrum data are obtained, and then the components of the gas are detected.
In particular, the pretreatment device may be a filter, a water purifier or a distiller.
Specifically, the Fourier infrared spectrometer is Spectrum Two of PE company, the scanning range is 8300-350 cm < -1 >, the spectral resolution is better than 0.5cm < -1 >, the wavelength accuracy is 0.01cm < -1 >, the wavelength accuracy is.1 cm < -1 >, and the signal to noise ratio is 14500:1. the wave number detected by the spectrometer is 400-4000 cm < -1 >, and the wave number range can meet the detection requirement of the cable ablation characteristic gas. The collected gas can be analyzed, and according to the molecular infrared spectrum theory, different gas molecules can absorb light with specific energy (frequency) to generate transition.
Specifically, as shown in fig. 2, for gas detection, an infrared spectrometer, a hydrogen sensor, a temperature and humidity sensor and a gas pressure sensor are mainly adopted for detection, and the pretreatment device can be communicated with the infrared spectrometer through a gas pipe and also can be communicated with the hydrogen sensor through the gas pipe. The gas tank can be communicated with the infrared spectrometer and the hydrogen sensor through a gas pipe.
The detected gas types are 5 (methane, ethane, ethylene, acetylene and hydrogen), the detection limit is less than 5ppm, and the detection relative error is less than 20%. The electrochemical hydrogen sensor is adopted, the hydrogen content in the gas can be detected in real time, the resolution of the hydrogen sensor is 1ppm, the detection limit is 20ppm, and the measurement range is 0-2000 ppm.
Specifically, as shown in fig. 2, for the collected gas, the cable is perforated first, then gas is taken out, and then the collected gas is dried by a pretreatment device. The punching operation can be carried out on the cable outer sheath and the aluminum sheath, an 8mm starting hose is adopted to be communicated with the air hole and the pretreatment device, and the pretreatment device can rapidly extract the gas of the buffer layer.
Specifically, as shown in fig. 2, the system further includes a communication device, which can communicate with the infrared spectrometer, and the communication device is configured to upload the spectral data detected by the infrared spectrometer and the hydrogen concentration detected by the hydrogen sensor to the processing device. The processing device may be an upper computer. In addition, the upper computer can also process the spectrum data of the infrared spectrum gas measurement module to display the infrared absorption spectrum and the real-time concentration of each gas.
In a specific implementation process, as shown in fig. 1, the cable detection system further includes a gas tank 16, where the gas tank includes a gas inlet and a gas outlet, the gas inlet is communicated with the gas pump through a gas pipe, the gas outlet outputs the gas to an external space through the gas pipe, and the gas tank is used for storing the gas.
In this scheme, the gas pond side has air inlet, gas outlet, and the air inlet is connected with preprocessing device's output, and the gas pond adopts inside biconical structure, can effectively reduce the volumetric air chamber structure of air chamber, improves the dynamic characteristics of gas spectral analysis, reduces air chamber cleaning time to reduce the missing survey data.
Specifically, as shown in fig. 2, for sample gas collection, sample gas collection is mainly performed by a gas cell. The detected gas can be treated and recovered.
Specifically, the main technical indexes which can be achieved by the scheme of the application are as follows:
(1) Detecting gas types: CH (CH) 4 、C 2 H 6 、C 2 H 4 、C 2 H 2 、CO、CO 2 All buffer layer ablation defect characteristic gases can be detected;
(2) Detection limit: better than 5ppm;
(3) Detecting a relative error <20%;
(4) Detection period: 30s;
(5) Linearity error: 2% f.s.;
(6) Zero drift for 24 hours: 2% f.s.;
Specifically, in the examples of the present application, data measured using a multicomponent ablative gas standard gas are shown in table 1.
TABLE 1
The measured concentration data show that the low concentration measurement error is larger, the carbon dioxide measurement accuracy is relatively lower, and the other measurement accuracy meets the requirements.
According to the multi-parameter detection scheme for the ablation fault diagnosis of the high-voltage cable buffer layer, the gas concentration is analyzed by adopting a Fourier transform infrared spectrometry based on the gas such as methane, ethane, ethylene, acetylene and hydrogen generated when the high-voltage cable water-blocking buffer layer is ablated for the first time, so that the cable ablation degree is judged, and meanwhile, a temperature, humidity, current and other multi-parameter detection method and system are provided, and data visualization is performed. The scheme provides a new path for the diagnosis method based on the cable ablation gas, can realize the rapid on-line detection of the multi-component gas, has high analysis speed and high safety, integrates multi-parameter monitoring of temperature, humidity, current and the like, and can be directly applied to the sites of cable wells and the like. The method provides important reference value for researching the ablation defect degree of the water-blocking buffer layer of the high-voltage cable, and has great theoretical significance and application value.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the mobile terminal as an example, fig. 3 is a block diagram of a hardware structure of the mobile terminal according to a control method of the cable detection system according to an embodiment of the present invention. As shown in fig. 3, the mobile terminal may include one or more (only one is shown in fig. 3) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may further include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 3 is merely illustrative and not limiting on the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 3, or have a different configuration than shown in fig. 3.
The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a display method of device information in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above-described method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.
In the present embodiment, a control method of a cable detection system operating on a mobile terminal, a computer terminal, or a similar computing device is provided, it should be noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different from that herein.
Fig. 4 is a flow chart of a control method of a cable detection system according to an embodiment of the present application. As shown in fig. 4, the method comprises the steps of:
step S201, acquiring spectrum data, wherein the spectrum data is the absorption intensity of the gas to light;
in particular, the absorption intensity data of the gas for light can be obtained, i.e. the extent to which light of different wavelengths is absorbed in the gas is recorded.
Step S202, determining the concentration of the hydrogen according to the spectrum data;
specifically, the concentration of hydrogen is determined by analyzing given spectral data. Spectral data is information obtained by measuring and recording the energy absorbed or emitted by a substance under electromagnetic radiation of different wavelengths or frequencies. By studying the absorption or emission characteristics of hydrogen at a particular wavelength or frequency, the concentration of hydrogen can be inferred.
Step S203, determining the ablation degree of the cable at least according to the concentration of the hydrogen.
In particular, the extent of ablation of the cable can be determined based on the concentration of hydrogen. By measuring the concentration of hydrogen, it can be determined whether the cable is affected by ablation, and the extent of ablation. In addition, the hydrogen concentration can be singly used for determining the ablation degree of the cable, and the hydrogen concentration can be detected by using a multi-parameter detection mode through other parameters.
Through the embodiment, hydrogen is generated when the high-voltage cable water-blocking buffer layer is ablated, and the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be acquired, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect detection efficiency of the high-voltage cable water-blocking buffer layer is low in the prior art is solved.
Specifically, the scheme of the application innovates and uses the infrared spectroscopy to analyze the gas to judge the cable ablation degree for the first time, provides a new path for the gas detection method of cable ablation, can realize the rapid on-line detection of multi-component gas, can realize the rapid and accurate measurement of the characteristic gas of cable ablation by the infrared spectroscopy, has high analysis speed and high safety, and has stronger usability in field environments such as cable underground. The method provides important reference value for researching the ablation defect degree of the water-blocking buffer layer of the high-voltage cable, and has great theoretical significance and application value.
In a specific implementation process, determining the concentration of the hydrogen according to the spectral data includes: determining the concentration according to a target formula, wherein the target formula is as follows:
wherein A represents absorbance, I 0 Representing the intensity of incident monochromatic light, I t The projected light intensity, T, transmittance, K, molar absorption coefficient, l, medium thickness, and c represent the above concentrations.
In the scheme, the relation between the intensity of absorption of a substance to light with a certain wavelength and the concentration of a light absorbing substance and the thickness of a medium thereof can be described according to the lambert law, when the thickness l of the absorption medium is unchanged, A and c are in a direct proportion relation, according to the basic theory, the concentrations of different gases can be analyzed through the spectrum of transmitted light, the abscissa (wavelength) of a spectrum absorption peak reflects the types of the gases, the ordinate (intensity) of the spectrum absorption peak reflects the concentrations of the gases, and the qualitative and quantitative analysis of the gases can be realized. And comparing the concentration of various gases with a threshold value, and judging the ablation degree of the cable.
In order to ensure the accuracy of the infrared spectrometer measurement, the cable detection system further includes a temperature and humidity sensor for detecting a gas temperature and a gas humidity of the gas, a gas pressure sensor for detecting a gas pressure of the gas, and an infrared spectrometer for determining a composition of the gas, and the method further includes, before acquiring the spectral data: acquiring the gas temperature, the gas humidity and the gas pressure; and calibrating the infrared spectrometer according to the gas temperature, the gas humidity and the gas pressure.
In the scheme, the error of the infrared spectrometer can be corrected through calibration, so that the error of the instrument is eliminated, the measured result is consistent with the true value, the calibrated instrument can stably perform infrared spectrum measurement, the fluctuation of the measured result is reduced, and the comparability of the measured result under different time, different instruments and different experimental conditions can be ensured through calibration.
Specifically, an infrared spectrometer may be placed in an environment of known temperature, the output values of the instrument recorded, and a relationship between temperature and output values established. The temperature measurement may be made using a standard temperature source or thermometer.
Specifically, an infrared spectrometer can be placed in an environment with known humidity, the output value of the instrument is recorded, and a relation curve between the humidity and the output value is established. Humidity measurements may be made using a hygrometer.
Specifically, an infrared spectrometer may be placed in an environment of known air pressure, the output value of the instrument recorded, and a relationship between air pressure and output value established. Barometers may be used for barometric measurements.
Specifically, the output of the infrared spectrometer can be corrected and adjusted according to the calibration curves of temperature, humidity and air pressure, so that the infrared spectrometer can accurately measure the infrared spectrum of the sample.
In some embodiments, the cable detection system further comprises an infrared thermometer for detecting a cable temperature of the cable and a current sensor for detecting a current of the cable, the method further comprising, prior to acquiring the spectral data: acquiring the temperature of the cable; determining the position of the maximum value of the cable temperature as the position of the air taking interface; acquiring the concentration of the hydrogen at the gas extraction interface and the current at the gas extraction interface; in case the concentration is above a concentration threshold and/or the current is above a current threshold, it is determined that the cable has ablated.
In the scheme, the temperature of the cable is firstly obtained, if the temperature is higher, the cable is likely to be ablated or is about to be ablated, so that gas is taken from the position with the highest temperature, the collected gas is the most representative, whether the cable is ablated or not can be comprehensively judged according to the concentration and the current, and whether the cable is ablated or not can be accurately determined by judging whether the concentration and the current exceed a threshold value or not.
For example, hydrogen concentration: 100ppm, cable current: cable ablation degree = 0.1 hydrogen concentration +0.5 current, expected ablation degree: 0.1 x 100+0.5 x 10=5.5, actual degree of ablation: 6.0, the actual ablation degree is higher than the expected ablation degree, and the cable ablation degree is higher.
For example, hydrogen concentration: 50ppm, cable current: 5A, cable ablation degree = 0.1 hydrogen concentration +0.5 current, expected ablation degree: 0.1×50+0.5×5=2.75, actual ablation degree: 2.5, the actual ablation level is lower than the expected ablation level, and the cable ablation level is lower.
For example, hydrogen concentration: 200ppm, cable current: 15A, cable ablation degree = 0.1 hydrogen concentration +0.5 current, expected ablation degree: 0.1×200+0.5×15=12.5, actual ablation degree: 12.5, the actual ablation level is equal to the expected ablation level, and the cable ablation level is normal.
Specifically, as shown in fig. 5, the steps mainly included in the present solution are a gas collection step, a gas detection step, a system detection step, and a gas analysis step. And a gas collection step: punching the outer sheath and the aluminum sheath of the high-voltage cable to be detected, extracting gas in the cable at the punching position, and drying and preprocessing the gas; and a gas detection step: analyzing the collected gas by using an infrared spectrometer and a hydrogen sensor to obtain gas components and concentration; the system detection step: the temperature and humidity sensor and the air pressure sensor are utilized to monitor the temperature and humidity and air pressure change in the cable in real time; and a gas analysis step: the multi-parameter data detected by the system is displayed and analyzed by the upper computer and is used for judging the ablation fault condition of the cable.
The embodiment of the application also provides a control device of the cable detection system, and it is to be noted that the control device of the cable detection system of the embodiment of the application can be used for executing the control method for the cable detection system provided by the embodiment of the application. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
The following describes a control device of the cable detection system provided in the embodiment of the present application.
Fig. 6 is a block diagram of a control device of a cable detection system according to an embodiment of the present application. As shown in fig. 6, the apparatus includes:
a first acquisition unit 100 configured to acquire spectral data, where the spectral data is an absorption intensity of the gas with respect to light;
in particular, the absorption intensity data of the gas for light can be obtained, i.e. the extent to which light of different wavelengths is absorbed in the gas is recorded.
A first determining unit 200 for determining the concentration of the hydrogen gas based on the spectral data;
specifically, the concentration of hydrogen is determined by analyzing given spectral data. Spectral data is information obtained by measuring and recording the energy absorbed or emitted by a substance under electromagnetic radiation of different wavelengths or frequencies. By studying the absorption or emission characteristics of hydrogen at a particular wavelength or frequency, the concentration of hydrogen can be inferred.
A second determining unit 300 for determining the degree of ablation of the cable based at least on the concentration of the hydrogen gas.
In particular, the extent of ablation of the cable can be determined based on the concentration of hydrogen. By measuring the concentration of hydrogen, it can be determined whether the cable is affected by ablation, and the extent of ablation. In addition, the hydrogen concentration can be singly used for determining the ablation degree of the cable, and the hydrogen concentration can be detected by using a multi-parameter detection mode through other parameters.
Through the embodiment, hydrogen is generated when the high-voltage cable water-blocking buffer layer is ablated, and the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be acquired, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect detection efficiency of the high-voltage cable water-blocking buffer layer is low in the prior art is solved.
Specifically, the scheme of the application innovates and uses the infrared spectroscopy to analyze the gas to judge the cable ablation degree for the first time, provides a new path for the gas detection method of cable ablation, can realize the rapid on-line detection of multi-component gas, can realize the rapid and accurate measurement of the characteristic gas of cable ablation by the infrared spectroscopy, has high analysis speed and high safety, and has stronger usability in field environments such as cable underground. The method provides important reference value for researching the ablation defect degree of the water-blocking buffer layer of the high-voltage cable, and has great theoretical significance and application value.
In a specific implementation process, the first determining unit includes a determining module, where the determining module is configured to determine the concentration according to a target formula, and the target formula is:
wherein A represents absorbance, I 0 Representing the intensity of incident monochromatic light, I t The projected light intensity, T, transmittance, K, molar absorption coefficient, l, medium thickness, and c represent the above concentrations.
In the scheme, the relation between the intensity of absorption of a substance to light with a certain wavelength and the concentration of a light absorbing substance and the thickness of a medium thereof can be described according to the lambert law, when the thickness l of the absorption medium is unchanged, A and c are in a direct proportion relation, according to the basic theory, the concentrations of different gases can be analyzed through the spectrum of transmitted light, the abscissa (wavelength) of a spectrum absorption peak reflects the types of the gases, the ordinate (intensity) of the spectrum absorption peak reflects the concentrations of the gases, and the qualitative and quantitative analysis of the gases can be realized. And comparing the concentration of various gases with a threshold value, and judging the ablation degree of the cable.
In order to ensure the accuracy of the infrared spectrometer measurement, the cable detection system further comprises a temperature and humidity sensor for detecting the gas temperature and the gas humidity of the gas, a gas pressure sensor for detecting the gas pressure of the gas, and a infrared spectrometer for determining the composition of the gas, and a second acquisition unit for acquiring the gas temperature, the gas humidity, and the gas pressure before acquiring the spectral data; the processing unit is used for calibrating the infrared spectrometer according to the gas temperature, the gas humidity and the gas pressure.
In the scheme, the error of the infrared spectrometer can be corrected through calibration, so that the error of the instrument is eliminated, the measured result is consistent with the true value, the calibrated instrument can stably perform infrared spectrum measurement, the fluctuation of the measured result is reduced, and the comparability of the measured result under different time, different instruments and different experimental conditions can be ensured through calibration.
Specifically, an infrared spectrometer may be placed in an environment of known temperature, the output values of the instrument recorded, and a relationship between temperature and output values established. The temperature measurement may be made using a standard temperature source or thermometer.
Specifically, an infrared spectrometer can be placed in an environment with known humidity, the output value of the instrument is recorded, and a relation curve between the humidity and the output value is established. Humidity measurements may be made using a hygrometer.
Specifically, an infrared spectrometer may be placed in an environment of known air pressure, the output value of the instrument recorded, and a relationship between air pressure and output value established. Barometers may be used for barometric measurements.
Specifically, the output of the infrared spectrometer can be corrected and adjusted according to the calibration curves of temperature, humidity and air pressure, so that the infrared spectrometer can accurately measure the infrared spectrum of the sample.
In some embodiments, the cable detection system further includes an infrared thermometer for detecting a cable temperature of the cable and a current sensor for detecting a current of the cable, the apparatus further includes a third acquisition unit for acquiring the cable temperature before acquiring the spectral data, a third determination unit, a fourth acquisition unit, and a fourth determination unit; the third determining unit is used for determining the position of the maximum value of the cable temperature as the position of the air taking interface; the fourth acquisition unit is used for acquiring the concentration of the hydrogen at the gas extraction interface and the current at the gas extraction interface; the fourth determination unit is configured to determine that the cable has been ablated in case the concentration is greater than a concentration threshold and/or the current is greater than a current threshold.
In the scheme, the temperature of the cable is firstly obtained, if the temperature is higher, the cable is likely to be ablated or is about to be ablated, so that gas is taken from the position with the highest temperature, the collected gas is the most representative, whether the cable is ablated or not can be comprehensively judged according to the concentration and the current, and whether the cable is ablated or not can be accurately determined by judging whether the concentration and the current exceed a threshold value or not.
For example, hydrogen concentration: 100ppm, cable current: cable ablation degree = 0.1 hydrogen concentration +0.5 current, expected ablation degree: 0.1 x 100+0.5 x 10=5.5, actual degree of ablation: 6.0, the actual ablation degree is higher than the expected ablation degree, and the cable ablation degree is higher.
For example, hydrogen concentration: 50ppm, cable current: 5A, cable ablation degree = 0.1 hydrogen concentration +0.5 current, expected ablation degree: 0.1×50+0.5×5=2.75, actual ablation degree: 2.5, the actual ablation level is lower than the expected ablation level, and the cable ablation level is lower.
For example, hydrogen concentration: 200ppm, cable current: 15A, cable ablation degree = 0.1 hydrogen concentration +0.5 current, expected ablation degree: 0.1×200+0.5×15=12.5, actual ablation degree: 12.5, the actual ablation level is equal to the expected ablation level, and the cable ablation level is normal.
Specifically, as shown in fig. 5, the steps mainly included in the present solution are a gas collection step, a gas detection step, a system detection step, and a gas analysis step. And a gas collection step: punching the outer sheath and the aluminum sheath of the high-voltage cable to be detected, extracting gas in the cable at the punching position, and drying and preprocessing the gas; and a gas detection step: analyzing the collected gas by using an infrared spectrometer and a hydrogen sensor to obtain gas components and concentration; the system detection step: the temperature and humidity sensor and the air pressure sensor are utilized to monitor the temperature and humidity and air pressure change in the cable in real time; and a gas analysis step: the multi-parameter data detected by the system is displayed and analyzed by the upper computer and is used for judging the ablation fault condition of the cable.
The control device of the cable detection system comprises a processor and a memory, wherein the first acquisition unit, the first determination unit, the second determination unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The core can be provided with one or more cores, and the problem of low ablation defect detection efficiency of the high-voltage cable water-blocking buffer layer in the prior art is solved by adjusting core parameters.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is located to execute a control method of the cable detection system.
Specifically, the control method of the cable detection system includes:
step S201, acquiring spectrum data, wherein the spectrum data is the absorption intensity of the gas to light;
step S202, determining the concentration of the hydrogen according to the spectrum data;
step S203, determining the ablation degree of the cable at least according to the concentration of the hydrogen.
The embodiment of the invention provides a processor, which is used for running a program, wherein the control method of the cable detection system is executed when the program runs.
Specifically, the control method of the cable detection system includes:
step S201, acquiring spectrum data, wherein the spectrum data is the absorption intensity of the gas to light;
step S202, determining the concentration of the hydrogen according to the spectrum data;
step S203, determining the ablation degree of the cable at least according to the concentration of the hydrogen.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:
step S201, acquiring spectrum data, wherein the spectrum data is the absorption intensity of the gas to light;
step S202, determining the concentration of the hydrogen according to the spectrum data;
step S203, determining the ablation degree of the cable at least according to the concentration of the hydrogen.
The device herein may be a server, PC, PAD, cell phone, etc.
The present application also provides a computer program product adapted to perform a program initialized with at least the following method steps when executed on a data processing device:
Step S201, acquiring spectrum data, wherein the spectrum data is the absorption intensity of the gas to light;
step S202, determining the concentration of the hydrogen according to the spectrum data;
step S203, determining the ablation degree of the cable at least according to the concentration of the hydrogen.
It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
1) According to the cable detection system, hydrogen is generated when the high-voltage cable water-blocking buffer layer is ablated, the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be collected, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect detection efficiency of the high-voltage cable water-blocking buffer layer in the prior art is low is solved.
2) According to the control method of the cable detection system, hydrogen is generated when the high-voltage cable water-blocking buffer layer is ablated, the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be collected, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect of the high-voltage cable water-blocking buffer layer is low in detection efficiency in the prior art is solved.
3) According to the control device of the cable detection system, hydrogen is generated when the high-voltage cable water-blocking buffer layer is ablated, the hydrogen is closely related to the degradation degree of the ablation defect of the buffer layer, so that the concentration of the hydrogen can be collected, the ablation degree of the cable is determined according to the concentration of the hydrogen, and the problem that the ablation defect of the high-voltage cable water-blocking buffer layer is low in detection efficiency in the prior art is solved.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A cable detection system, comprising:
the cable comprises an air taking interface;
the air pump is communicated with the air taking interface of the cable through an air pipe and is used for extracting air;
the hydrogen sensor is communicated with the air pump through an air pipe and is used for detecting the concentration of hydrogen in the gas;
and the processing equipment is electrically connected with the hydrogen sensor and is used for determining the ablation degree of the cable at least according to the concentration of the hydrogen, wherein the concentration and the ablation degree are in positive correlation.
2. The cable detection system of claim 1, wherein the cable detection system further comprises:
the temperature and humidity sensor is used for detecting the gas temperature and the gas humidity of the gas;
and the air pressure sensor is used for detecting the air pressure of the air.
3. The cable detection system of claim 1, wherein the cable detection system further comprises:
the infrared thermometer is used for detecting the cable temperature of the cable;
and the current sensor is used for detecting the current of the cable.
4. The cable detection system of claim 1, wherein the cable detection system further comprises:
the pretreatment device is communicated with the air pump through an air pipe and is used for drying the air;
an infrared spectrometer for determining the composition of the gas.
5. The cable detection system of claim 4, further comprising:
the gas tank comprises a gas inlet and a gas outlet, the gas inlet is communicated with the gas pump through a gas pipe, the gas outlet outputs gas to an external space through the gas pipe, and the gas tank is used for storing the gas.
6. A control method of the cable detection system according to any one of claims 1 to 5, characterized in that the method comprises:
acquiring spectrum data, wherein the spectrum data is the absorption intensity of the gas to light;
determining the concentration of the hydrogen gas from the spectral data;
the extent of ablation of the cable is determined based at least on the concentration of the hydrogen gas.
7. The method of claim 6, wherein determining the concentration of the hydrogen gas from the spectral data comprises:
determining the concentration according to a target formula, wherein the target formula is:
wherein A represents absorbance, I 0 Representing the intensity of incident monochromatic light, I t The projected light intensity, T, transmittance, K, molar absorption coefficient, l, medium thickness, and c represent the concentration.
8. The method of claim 6, wherein the cable detection system further comprises a temperature and humidity sensor for detecting a gas temperature and a gas humidity of the gas, a gas pressure sensor for detecting a gas pressure of the gas, and an infrared spectrometer for determining a composition of the gas, the method further comprising, prior to acquiring the spectral data:
Acquiring the gas temperature, the gas humidity and the gas pressure;
and calibrating the infrared spectrometer according to the gas temperature, the gas humidity and the gas pressure.
9. The method of claim 6, wherein the cable detection system further comprises an infrared thermometer for detecting a cable temperature of the cable and a current sensor for detecting a current of the cable, the method further comprising, prior to acquiring the spectral data:
acquiring the temperature of the cable;
determining the position of the maximum value of the cable temperature as the position of the air taking interface;
acquiring the concentration of the hydrogen at the gas extraction interface and the current at the gas extraction interface;
in the event that the concentration is greater than a concentration threshold and/or the current is greater than a current threshold, it is determined that the cable has ablated.
10. A control device of the cable detection system according to any one of claims 1 to 5, characterized in that the device comprises:
a first acquisition unit configured to acquire spectral data, where the spectral data is an absorption intensity of the gas for light;
A first determining unit configured to determine the concentration of the hydrogen gas from the spectral data;
a second determining unit for determining said degree of ablation of said cable based at least on said concentration of said hydrogen gas.
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