Operating method capable of remotely and wirelessly measuring capacitive current of wire

Abstract

The invention relates to the technical field of load monitoring, and discloses a load monitoring method of a low-voltage transformer area and a line electric leakage detection method, which are based on a measuring device capable of remotely and wirelessly telemetering lead capacitance current, and the measuring device capable of remotely and wirelessly telemetering the lead capacitance current comprises a measuring terminal and an equipment main body in wireless communication with the measuring terminal; comprising the following steps of: acquiring a current signal of a cable in real time by adopting an open current transformer; converting the current signal into a voltage signal by adopting an operational amplifier circuit; forming a time sequence of the signal through analog-to-digital conversion; obtaining a frequency component of the signal through spectral analysis; according to the method, real-time online monitoring is carried out on the cable through the measurement terminal, collected current data are transmitted to the equipment body or the mobile phone terminal, and a user remotely obtains measurement data.

Description

Technical Field

[0001] The invention relates to the technical field of conductor capacitance current measurement, and in particular to an operation method capable of remotely and wirelessly measuring conductor capacitance current. Background Art

[0002] With the rapid development of modern power systems, especially the large-scale application of new energy sources (such as wind and solar energy), the construction and application of high-voltage lines of 35kV and above have become increasingly common. These high-voltage lines play a key role in power transmission, especially in the case of long-distance power transmission and large-scale power transmission. As the number of high-voltage lines increases, the demand for current monitoring and detection is becoming increasingly urgent to ensure the safe, stable and efficient operation of the power system.

[0003] Current detection is an important task in the operation and maintenance of high-voltage lines. By real-time monitoring of current, problems such as line faults, overloads, and short circuits can be discovered in a timely manner, thereby ensuring the normal operation of the power system. However, traditional handheld ammeters have significant safety hazards when operating on high-voltage lines. Due to the high voltage level of high-voltage lines, operators must be close to live objects during measurement, increasing the risk of electric shock. Therefore, special caution must be taken when conducting high-voltage current detection to ensure the safety of operators.

[0004] Although the use of an insulated operating rod in conjunction with an ammeter can improve safety to a certain extent and reduce direct contact between personnel and high-voltage live parts, this method still has its shortcomings. Due to the length and flexibility of the operating rod, it is often difficult for operators to obtain accurate current values ​​at a sufficiently safe distance. In addition, the traditional operation method cannot achieve real-time observation of current data, which may cause inconvenience and delays during operation.

[0005] In some cases, due to the inconvenience of data acquisition, operators may need to adjust the position of the operating lever or change the measurement point multiple times, which prolongs the operation time and increases potential risks. The limitations of this traditional measurement method are particularly obvious in complex climatic conditions or highly polluted environments, so it is urgent to develop safer and more efficient high-voltage current detection technology. Summary of the invention

[0006] To solve the above problems, a method for remote wireless telemetry of conductor capacitance current is proposed, which is particularly suitable for live operations on 35kV and above high-voltage lines. It can realize real-time online monitoring of the current of the operating line or bypass cable, and transmit the measured data to the receiving end, reducing the risk of electric shock accidents.

[0007] The technical solution adopted by the present invention is:

[0008] A method for remotely and wirelessly measuring the capacitance current of a conductor. The method is based on a measuring device for remotely and wirelessly measuring the capacitance current of a conductor. The measuring device for remotely and wirelessly measuring the capacitance current of a conductor comprises a measuring terminal and a device body for wirelessly communicating with the measuring terminal.

[0009] The operation method capable of remotely and wirelessly measuring the capacitance current of a conductor comprises the following steps:

[0010] Step 1, current collection:

[0011] An open current transformer is used to collect the current signal of the cable in real time, and the collected current signal is transmitted to the measurement terminal;

[0012] Step 2, current signal conversion:

[0013] An operational amplifier circuit is used in the measurement terminal to convert the current signal into a voltage signal;

[0014] Step 3, analog-to-digital conversion:

[0015] The adjusted voltage signal is transmitted to the analog-to-digital converter in the measurement terminal. The analog-to-digital converter ADC converts the analog voltage signal into a digital signal and records it together with the acquisition time to form a time series of the signal.

[0016] Step 4, spectrum analysis:

[0017] Based on the sampled signal time series, the microcontroller MCU in the measurement terminal performs spectrum analysis of the current signal through fast Fourier transform FFT to obtain the frequency components of the signal and accurately reflect the dynamic characteristics of the current load;

[0018] Step 5, current value calculation and output:

[0019] After the Fourier transform FFT processing is completed, the microcontroller MCU in the measurement terminal extracts the amplitude of the signal from the frequency domain data, obtains the effective value of the current, that is, the RMS value, by detecting the amplitude of the fundamental frequency, and calculates and outputs the current load in real time;

[0020] Step 6, data transmission and remote monitoring:

[0021] The current load data after Fourier transform FFT analysis, including real-time current value and harmonic analysis results, is transmitted to the remote server or terminal device through the WiFi wireless communication module and 433 wireless communication module in the measurement terminal; it is displayed on the display screen of the device body or on the mobile phone, so that the operation and maintenance personnel can view the current load status of the substation in real time, and assist in load adjustment and system optimization.

[0022] Furthermore, the measuring terminal includes an open current transformer and a measuring terminal housing, a circuit board and a lithium iron phosphate battery for powering the circuit board are installed in the measuring terminal housing; the circuit board is provided with an operational amplifier circuit electrically connected to the open current transformer, an MCU peripheral basic circuit, a wifi wireless communication module and a 433 wireless communication module circuit;

[0023] The device body comprises a screen mounted on a housing, a circuit board located in the housing, and a lithium iron phosphate battery for powering the circuit board; the circuit board is electrically connected to the screen via a screen communication circuit, and is provided with an MCU peripheral basic circuit and a 433 wireless communication module;

[0024] The operating method capable of remotely and wirelessly measuring the capacitance current of a conductor performs real-time online monitoring of the cable through a measuring terminal, and transmits the collected current data to a device body or a mobile phone terminal, so that a user can obtain the measurement data remotely.

[0025] Furthermore, the open current transformer is a non-intrusive current detection device, which measures the magnitude of the alternating current by means of the magnetic field generated by the induced current.

[0026] Furthermore, the open current transformer proportionally reduces the size of the alternating current by winding a coil, and transmits the current signal to the measurement terminal through a lead wire.

[0027] Furthermore, the operational amplifier circuit comprises a sampling resistor, an operational amplifier and a bias resistor; if the current output by the open current transformer is I CT , the current passes through the resistor R connected to it, and the voltage signal V can be expressed by the following formula:

[0028] V=I CT ×R

[0029] At this stage, the operational amplifier adjusts the amplitude of the voltage signal Vze to adapt it to the input range of the subsequent analog-to-digital converter ADC.

[0030] Furthermore, the analog-to-digital conversion process of the analog-to-digital converter in the measurement terminal is as follows:

[0031] The analog-to-digital converter ADC inside the microcontroller MCU discretizes the continuous analog voltage signal into discrete digital values;

[0032] If the sampling rate is f S ; then the time interval between each voltage value is Δt,

[0033] Finally, a series of discrete voltage data are obtained to form the time series of the signal.

[0034] Furthermore, in the Fourier transform FFT processing, if a discrete signal x(n) with a length of N is given, the DFT formula is:

[0035]

[0036] In the formula, X(k) is the frequency domain signal; x(n) is the signal sequence in the time domain; N is the number of sampling points of the signal; is the Fourier basis function; k is the frequency component index; j is the imaginary unit;

[0037] FFT is a fast method to calculate the above formula, and the time complexity is from o(N 2 ) is reduced to O(N logN).

[0038] Furthermore, the Fourier transform FFT processing process includes the following steps:

[0039] Step 4.1, reading the discrete current signal x(n);

[0040] Step 4.2, use FFT to convert the signal from the time domain to the frequency domain to obtain the spectrum X(k);

[0041] Step 4.3, by analyzing the amplitude and phase information in X(k), the frequency characteristics of the signal are obtained;

[0042] The spectrum analysis of the current signal is performed through the fast Fourier transform FFT, the current data collected from the analog-to-digital converter ADC is analyzed, and its main frequency components are identified; the possible high-order harmonics or abnormal frequency components are detected through the Fourier transform FFT.

[0043] Further, the RMS value calculation process is:

[0044] If the detection base frequency is 50Hz, the amplitude of the 50Hz frequency component obtained by Fourier transform FFT is A 50 ; The effective current value corresponding to this frequency is I rms Calculated by the following formula:

[0045]

[0046] The current load is determined based on the RMS value of the current, and the data is transmitted to the device or mobile phone for remote monitoring and adjustment.

[0047] The beneficial effects of the present invention are:

[0048] 1. Improved security

[0049] Reduce close contact: By measuring current in a non-contact manner, the risk of workers being close to live objects is reduced, reducing safety hazards such as electric shock.

[0050] Remote monitoring: Operators can monitor current data in real time from a safe distance to ensure safety while improving work efficiency.

[0051] 2. Real-time data monitoring

[0052] Real-time data transmission: Through the wireless communication module, current data and harmonic analysis results can be transmitted to the remote server or terminal device in time to provide dynamic monitoring.

[0053] Real-time load status display: Operation and maintenance personnel can view the current load status in real time on the device body or mobile terminal, and quickly identify and respond to any abnormal situation.

[0054] 3. Accurate data analysis

[0055] Spectrum analysis capability: Fast Fourier transform (FFT) can be used to perform spectrum analysis on current signals, obtain load dynamic characteristics, and improve the depth and accuracy of data analysis.

[0056] Effective value calculation: Able to calculate and output the effective value (RMS) of current in real time, facilitating accurate monitoring and control of power loads.

[0057] 4. Promote load adjustment and system optimization

[0058] Auxiliary decision support: Through real-time current and harmonic analysis data, operation and maintenance personnel can make necessary adjustments based on actual load conditions, optimize the operation of the power system, and reduce energy loss.

[0059] Preventive maintenance: By continuously monitoring the current load, potential system problems can be discovered in a timely manner, which helps to carry out preventive maintenance and improve system reliability.

[0060] 5. Convenient user experience

[0061] Easy to use: The user-friendly operation interface allows users to easily obtain information on mobile devices, greatly facilitating daily monitoring and maintenance work.

[0062] Mobile access: Through mobile terminals, users can check current data anytime and anywhere, improving work efficiency and flexibility.

[0063] 6. Economic Benefits

[0064] Reduce labor costs: Reduce the need for manual on-site monitoring, improve monitoring efficiency, and thus reduce operation and maintenance costs.

[0065] Extend equipment life: Through effective monitoring and preventive maintenance, the service life of power equipment can be effectively extended, and the failure rate and repair costs can be reduced.

[0066] In summary, this technical solution not only improves the safety and reliability of power high-voltage line monitoring through wireless real-time monitoring and data processing, but also provides strong support and convenience for operation and maintenance management. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0068] Figure 1 It is a schematic diagram of the overall structure of the measuring device capable of remote wireless telemetry of the capacitance current of a conductor according to the present invention;

[0069] Figure 2 It is a schematic diagram of the internal structure of the measurement terminal of the present invention;

[0070] Figure 3 A circuit diagram of a sampling operational amplifier circuit of the present invention;

[0071] Figure 4 A circuit diagram of the MCU peripheral basic circuit of the present invention;

[0072] Figure 5 A circuit diagram of a wifi wireless communication module circuit of the present invention;

[0073] Figure 6 A circuit diagram of the 433 wireless communication module circuit of the present invention;

[0074] Markings in the figure: 1. Measuring terminal; 2. Equipment body; 3. Insulated operating rod; 4. Rotary joint; 5. Circuit board; 6. Open current transformer. DETAILED DESCRIPTION

[0075] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0076] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features and technical solutions in the embodiments can be combined with each other without conflict. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0077] This embodiment provides a method for remotely and wirelessly measuring the capacitance and current of a conductor. Figure 1 As shown, the operating method for remote wireless telemetry of conductor capacitance current is based on a measuring device for remote wireless telemetry of conductor capacitance current. The measuring device for remote wireless telemetry of conductor capacitance current includes a measuring terminal 1 and a device body 2 for wireless communication with the measuring terminal 1.

[0078] like Figure 1 and Figure 2 As shown, the measuring terminal 1 includes an open current transformer 6 and a measuring terminal 1 shell, and the measuring terminal 1 shell can be installed on the insulating operating rod 3 through a rotating joint 4; a circuit board 5 and a lithium iron phosphate battery for powering the circuit board 5 are installed in the measuring terminal 1 shell. The circuit board 5 is provided with an operational amplifier circuit electrically connected to the open current transformer 6, an MCU peripheral basic circuit, a wifi wireless communication module and a 433 wireless communication module circuit; wherein the operational amplifier circuit is as follows Figure 3 As shown, the MCU peripheral basic circuit is as follows Figure 4 As shown, the wifi wireless communication module circuit is as follows Figure 5 As shown, the 433 wireless communication module circuit is as follows Figure 6 shown.

[0079] like Figure 1 As shown, the device body 2 includes a screen mounted on a shell, a circuit board located inside the shell, and a lithium iron phosphate battery for powering the circuit board; the circuit board is electrically connected to the screen through a screen communication circuit, and is provided with an MCU peripheral basic circuit and a 433 wireless communication module.

[0080] When in use, the measuring terminal 1 can be installed on the wire through the insulating operating rod 3, and the cable can be monitored online in real time through the measuring terminal 1, and the collected current data can be transmitted to the device body 2 or the mobile phone terminal, so that the user can obtain the measurement data remotely. Through the remote measurement method, the operator does not need to approach the live high-voltage line, which significantly reduces the risk of electric shock caused by contact with the live body and improves the safety of the operation. The measuring terminal 1 can monitor the current situation online in real time to ensure the stable operation of the power system. Real-time data acquisition can detect abnormalities in time and improve the response speed of the system. Through wifi and 433 wireless communication modules, the wireless transmission method makes data acquisition more convenient. Users can receive current data in real time through mobile terminals or other devices, which improves the efficiency of information acquisition. The current transformer, operational amplifier circuit, MCU and communication module are integrated into the measuring terminal 1, which simplifies the operation process, reduces the complexity of the equipment, and improves the convenience of on-site operations. It is powered by lithium iron phosphate batteries, has a long service life and good safety, and ensures the stability and reliability of the equipment in long-term use. The measuring terminal 1 can be flexibly installed on the insulating operating rod 3 through the rotating joint 4, adapting to different working environments and enhancing the applicability of the equipment. The use of advanced op amp circuits and MCU-based circuits can provide high-precision current measurement and achieve accurate monitoring of current changes. Through remote monitoring and data reading, the frequency of manual operations is reduced, thereby reducing the possibility of human errors and improving work efficiency.

[0081] The operation method of remotely wirelessly measuring the capacitance current of a conductor is as follows:

[0082] Step 1, current collection:

[0083] An open current transformer 6 is used to collect the current signal of the cable in real time, and the collected current signal is transmitted to the measurement terminal 1.

[0084] The open current transformer 6 is a non-invasive current detection device, which measures the magnitude of the AC current by inducing the magnetic field generated by the current. The open current transformer 6 proportionally reduces the magnitude of the AC current by winding a coil, and transmits the current signal to the measurement terminal 1 through a lead wire.

[0085] The use of the open current transformer 6 can monitor the current signal of the cable in real time and efficiently, ensure the accuracy and real-time nature of the monitoring data, and provide reliable original data for subsequent analysis.

[0086] Step 2, current signal conversion:

[0087] The operational amplifier circuit in the measurement terminal 1 converts the current signal into a voltage signal.

[0088] Since the signal output by the open current transformer 6 is a current type, in order to facilitate subsequent processing, the current signal must be converted into a voltage signal. Figure 3 As shown, in this embodiment, an operational amplifier circuit is provided on the circuit board 5 in the measuring terminal 1, and the current signal is converted into a voltage signal by using the operational amplifier circuit.

[0089] Specifically, the current collected by the current transformer is connected to the operational amplifier circuit from the CN2 interface, the voltage is collected through the R117 resistor, and then the low-voltage signal is amplified ten times through the OPA333 operational amplifier, thereby converting it into a voltage signal that can be easily identified. The operational amplifier circuit is used to convert the current signal into a voltage signal, so that the signal can be further processed in the measurement terminal 1. This process ensures the compatibility of the signal and the stability of the transmission.

[0090] Further, such as Figure 3 As shown, the operational amplifier circuit includes a sampling resistor, an operational amplifier and a bias resistor; if the current output by the open current transformer 6 is I CT , the current passes through the resistor R connected to it, and the voltage signal V can be expressed by the following formula:

[0091] V=I CT ×R

[0092] At this stage, the operational amplifier adjusts the amplitude of the voltage signal Vze to adapt it to the input range of the subsequent analog-to-digital converter ADC.

[0093] The current output by the open current transformer 6 is converted into a voltage signal V by a sampling resistor R, forming an intuitive voltage representation, so that the current signal is more suitable for subsequent processing and analysis. The operational amplifier can adjust the amplitude of the voltage signal V to make it conform to the input range of the analog-to-digital converter ADC, which avoids data loss or distortion caused by too small or too large signal amplitude, and ensures the accuracy of data acquisition. The operational amplifier can gain the signal and effectively improve the signal strength. This is especially important in long-distance transmission or high-noise environments, and can enhance the anti-interference ability of the signal and ensure the reliability of the data. The use of bias resistors can provide appropriate bias for the current signal to achieve signal regulation. This adjustment can keep the signal stable in different working environments and increase the adaptability and versatility of the system.

[0094] The voltage signal V adjusted by the above circuit will greatly simplify the input requirements of the analog-to-digital converter, making the subsequent analog-to-digital conversion and data processing more efficient and reducing the complexity of subsequent circuit design. By using the operational amplifier circuit, the performance of the entire monitoring system is improved, ensuring that the final output data is accurate and stable.

[0095] Step 3, analog-to-digital conversion:

[0096] The adjusted voltage signal is transmitted to the analog-to-digital converter in the measurement terminal 1 . The analog-to-digital converter ADC converts the analog voltage signal into a digital signal and records it together with the acquisition time to form a time series of the signal.

[0097] The analog-to-digital converter (ADC) converts analog signals into digital signals, making them available for processing by the microcontroller. This process improves the accuracy of the data while supporting subsequent data analysis and storage.

[0098] Further, the analog-to-digital conversion process of the analog-to-digital converter in the measurement terminal 1 is as follows:

[0099] The analog-to-digital converter ADC inside the microcontroller MCU discretizes the continuous analog voltage signal into discrete digital values;

[0100] If the sampling rate is f S ; For example, 8kHz; then the time interval between each voltage value is Δt,

[0101] Finally, a series of discrete voltage data are obtained to form the time series of the signal.

[0102] By converting continuous analog voltage signals into discrete digital values, signal digitization is achieved, facilitating subsequent data processing and analysis.

[0103] By converting continuous analog voltage signals into discrete digital values, the signal is digitized, which facilitates subsequent data processing and analysis. Digital signals are easier to process than analog signals. Using the algorithms in the microcontroller MCU, data operations such as calculation, filtering, and analysis can be performed quickly, thereby improving the overall processing efficiency of the system. Digital signals are easy to store in various storage devices and can be efficiently transmitted through digital communication channels. Compared with analog signals, digital signals are less susceptible to noise interference during transmission, which effectively ensures the integrity of the data.

[0104] By selecting the sampling rate f S , can accurately capture and reproduce the characteristics of the original signal, ensure the accuracy and effectiveness of the data, and enable subsequent processing to restore a close-to-real analog signal. By setting a suitable sampling frequency f S , can be flexibly adjusted to meet different application requirements to optimize system performance and response speed. For example, for fast-changing signals, a higher sampling rate can be selected to capture more details.

[0105] Analog-to-digital converters can provide high-precision voltage data. Unlike the drift or noise that may occur in analog signals, digital processing can greatly improve the accuracy and reliability of measurements. The generated discrete time series data can be used for real-time monitoring and analysis, supporting the implementation of automatic control strategies, fault detection and diagnosis, and helping to improve the intelligence level of the system.

[0106] Through the rapid analog-to-digital conversion process, real-time data monitoring and feedback are supported, enabling the system to quickly adapt to changes in a dynamic environment and improving the system's responsiveness and flexibility.

[0107] Step 4, spectrum analysis:

[0108] Based on the signal time series obtained by sampling, the microcontroller MCU in the measurement terminal 1 performs spectrum analysis of the current signal through fast Fourier transform FFT to obtain the frequency components of the signal and accurately reflect the dynamic characteristics of the current load.

[0109] Through the fast Fourier transform FFT, the measurement terminal 1 can analyze the spectrum of the current signal and identify the frequency components of the signal. This provides a basis for understanding the dynamic characteristics of the current load and helps identify possible load changes and abnormal conditions.

[0110] Furthermore, in the Fourier transform FFT processing, if a discrete signal x(n) with a length of N is given, the DFT formula is:

[0111]

[0112] In the formula, X(k) is the frequency domain signal; x(n) is the signal sequence in the time domain; N is the number of sampling points of the signal; is the Fourier basis function; k is the frequency component index; j is the imaginary unit;

[0113] FFT is a fast method to calculate the above formula, and the time complexity is from o(N 2 ) is reduced to O(N logN).

[0114] The Fourier transform FFT processing includes the following steps:

[0115] Step 4.1, reading the discrete current signal x(n);

[0116] Step 4.2, use FFT to convert the signal from the time domain to the frequency domain to obtain the spectrum X(k);

[0117] Step 4.3, by analyzing the amplitude and phase information in X(k), the frequency characteristics of the signal are obtained;

[0118] The spectrum analysis of the current signal is performed through the fast Fourier transform FFT, which analyzes the current data collected from the analog-to-digital converter ADC and identifies its main frequency components. The AC current signal usually operates at a basic frequency of 50Hz or 60Hz, and the possible high-order harmonics or abnormal frequency components are detected through the Fourier transform FFT.

[0119] The Fourier transform FFT process can identify the main frequency components in the signal, which is convenient for analyzing and optimizing the behavior of the system; the Fourier transform FFT process reduces the computational complexity from o(N 2 ) is reduced to O(N logN), making it more efficient to process large-scale data and saving computing time and resources. Harmonic analysis can effectively detect high-order harmonics in the system and help identify potential power quality issues such as nonlinear loads and harmonic distortion. By analyzing abnormal frequency components in the frequency domain, electrical faults or equipment failures can be detected early to ensure the safe operation of equipment. Real-time Fourier transform FFT processing can be used to monitor current signals online, provide timely system status feedback, and facilitate dynamic control and management.

[0120] Step 5, current value calculation and output:

[0121] After the Fourier transform FFT processing is completed, the microcontroller MCU in the measurement terminal 1 extracts the amplitude of the signal from the frequency domain data, obtains the effective value of the current, that is, the RMS value, by detecting the amplitude of the fundamental frequency, and calculates and outputs the current load in real time.

[0122] The amplitude of the signal is extracted and the effective RMS value is calculated to provide real-time and reliable current load information for operation and maintenance personnel. This helps to adjust the load in time, optimize power use and avoid overload.

[0123] The RMS value calculation process is:

[0124] If the detection base frequency is 50Hz, the amplitude of the 50Hz frequency component obtained by Fourier transform FFT is A 50 ; The effective current value corresponding to this frequency is I rms Calculated by the following formula:

[0125]

[0126] The current load size is determined based on the RMS value of the current, and the data is transmitted to the device body 2 or a mobile phone for remote monitoring and adjustment.

[0127] The RMS value can accurately reflect the effective value of the current signal, thereby helping to determine the current load size and facilitating the effective management of power consumption. The calculated RMS value is transmitted to the device body 2 or a mobile phone to achieve remote monitoring, provide users with instant feedback, and facilitate energy consumption management. When the RMS value is abnormal, an early warning signal can be issued in time to help users locate and resolve potential equipment failures and prevent more serious failures from occurring. The collected RMS values ​​and other related data can be used for later analysis, provide decision support, and help formulate more effective energy management strategies.

[0128] Step 6, data transmission and remote monitoring:

[0129] The current load data after Fourier transform FFT analysis, including the real-time current value and harmonic analysis results, is transmitted to the remote server or terminal device through the WiFi wireless communication module and the 433 wireless communication module in the measurement terminal 1; it is displayed on the display screen of the device body 2 or on the mobile phone, so that the operation and maintenance personnel can view the current load status of the substation in real time, and assist in load adjustment and system optimization.

[0130] The wireless communication module transmits data to the remote server in real time, allowing operation and maintenance personnel to monitor the current load status on different devices in real time. This function enhances the visual management of the system, facilitates quick response even in remote locations, and improves operation and maintenance efficiency.

[0131] In summary, this operating method for remote wireless telemetry of conductor capacitance and current, through the implementation of remote wireless telemetry, effectively improves the safety, convenience and efficiency of high-voltage line monitoring in the power system, and provides a practical solution for power monitoring and maintenance.

[0132] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for remote wireless telemetry of conductor capacitance current, characterized in that: The operation method capable of remote wireless telemetry of conductor capacitance current is based on a measuring device capable of remote wireless telemetry of conductor capacitance current, the measuring device capable of remote wireless telemetry of conductor capacitance current comprising a measuring terminal and a device body capable of wirelessly communicating with the measuring terminal; The operation method capable of remotely and wirelessly measuring the capacitance current of a conductor comprises the following steps: Step 1, current collection: An open current transformer is used to collect the current signal of the cable in real time, and the collected current signal is transmitted to the measurement terminal; Step 2, current signal conversion: An operational amplifier circuit is used in the measurement terminal to convert the current signal into a voltage signal; Step 3, analog-to-digital conversion: The adjusted voltage signal is transmitted to the analog-to-digital converter in the measurement terminal. The analog-to-digital converter ADC converts the analog voltage signal into a digital signal and records it together with the acquisition time to form a time series of the signal. Step 4, spectrum analysis: Based on the sampled signal time series, the microcontroller MCU in the measurement terminal performs spectrum analysis of the current signal through fast Fourier transform FFT to obtain the frequency components of the signal and accurately reflect the dynamic characteristics of the current load; Step 5, current value calculation and output: After the Fourier transform FFT processing is completed, the microcontroller MCU in the measurement terminal extracts the amplitude of the signal from the frequency domain data, obtains the effective value of the current, that is, the RMS value, by detecting the amplitude of the fundamental frequency, and calculates and outputs the current load in real time; Step 6, data transmission and remote monitoring: The current load data after Fourier transform FFT analysis, including real-time current value and harmonic analysis results, is transmitted to the remote server or terminal device through the WiFi wireless communication module and 433 wireless communication module in the measurement terminal; it is displayed on the display screen of the device body or on the mobile phone, so that the operation and maintenance personnel can view the current load status of the substation in real time, and assist in load adjustment and system optimization.

2. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 1, characterized in that: The measuring terminal comprises an open current transformer and a measuring terminal housing, a circuit board and a lithium iron phosphate battery for powering the circuit board are installed in the measuring terminal housing; the circuit board is provided with an operational amplifier circuit electrically connected to the open current transformer, an MCU peripheral basic circuit, a wifi wireless communication module and a 433 wireless communication module circuit; The device body comprises a screen mounted on a housing, a circuit board located in the housing, and a lithium iron phosphate battery for powering the circuit board; the circuit board is electrically connected to the screen via a screen communication circuit, and is provided with an MCU peripheral basic circuit and a 433 wireless communication module; The operating method capable of remotely and wirelessly measuring the capacitance current of a conductor performs real-time online monitoring of the cable through a measuring terminal, and transmits the collected current data to a device body or a mobile phone terminal, so that a user can obtain the measurement data remotely.

3. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 1, characterized in that: The open current transformer is a non-intrusive current detection device, which measures the magnitude of the alternating current by means of the magnetic field generated by the induction current.

4. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 1, characterized in that: The open current transformer proportionally reduces the size of the alternating current by winding a coil, and transmits the current signal to the measurement terminal through a lead wire.

5. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 1, characterized in that: The operational amplifier circuit comprises a sampling resistor, an operational amplifier and a bias resistor; if the current output by the open current transformer is I CT , the current passes through the resistor R connected to it, and the voltage signal V can be expressed by the following formula: V=I CT ×R At this stage, the operational amplifier adjusts the amplitude of the voltage signal Vze to adapt it to the input range of the subsequent analog-to-digital converter ADC.

6. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 1, characterized in that: The analog-to-digital conversion process of the analog-to-digital converter in the measurement terminal is as follows: The analog-to-digital converter ADC inside the microcontroller MCU discretizes the continuous analog voltage signal into discrete digital values; If the sampling rate is f S ; then the time interval between each voltage value is Δt, Finally, a series of discrete voltage data are obtained to form the time series of the signal.

7. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 1, characterized in that: In the Fourier transform FFT processing, if a discrete signal x(n) with a length of N is given, the DFT formula is: In the formula, X(k) is the frequency domain signal; x(n) is the signal sequence in the time domain; N is the number of sampling points of the signal; is the Fourier basis function; k is the frequency component index; j is the imaginary unit; FFT is a fast method to calculate the above formula, and the time complexity is from o(N 2 ) is reduced to O(NlogN).

8. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 7, characterized in that: The Fourier transform FFT processing process includes the following steps: Step 4.1, reading the discrete current signal x(n); Step 4.2, use FFT to convert the signal from the time domain to the frequency domain to obtain the spectrum X(k); Step 4.3, by analyzing the amplitude and phase information in X(k), the frequency characteristics of the signal are obtained; The spectrum analysis of the current signal is performed through the fast Fourier transform FFT, the current data collected from the analog-to-digital converter ADC is analyzed, and its main frequency components are identified; the possible high-order harmonics or abnormal frequency components are detected through the Fourier transform FFT.

9. The method for remotely and wirelessly measuring the capacitance and current of a conductor according to claim 1, characterized in that: The RMS value calculation process is: If the detection base frequency is 50Hz, the amplitude of the 50Hz frequency component obtained by Fourier transform FFT is A 50 ; The effective current value corresponding to this frequency is I rms Calculated by the following formula: The current load is determined based on the RMS value of the current, and the data is transmitted to the device or mobile phone for remote monitoring and adjustment.

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