Methods, systems and devices for detecting electrical signals and time synchronization of traveling wave ranging equipment

Abstract

This invention discloses a method, system, and apparatus for detecting the electrical signals and time synchronization of a traveling wave ranging device. The method involves establishing a detection system for the electrical signals and time synchronization of the traveling wave ranging device, performing device self-testing, and selecting the detection method and test items through a controllable module upon completion of the self-test. Further signal acquisition is performed to obtain the data signal curves of the test items. The system then determines whether the test items meet the standards based on the data signal curves. If the test items meet the standards, it determines whether further testing is needed. If no further testing is needed, the detection data, results, and alarm information are encoded and uploaded to a remote backend server via wired or wireless means for data decoding, processing, analysis, current data waveform plotting, and database entry. When the test data accumulates to a certain level, it is used to detect the performance status of the tested traveling wave ranging device and determine its lifespan.

Description

Technical Field

[0001] This invention relates to the field of power equipment testing technology, specifically to a method, system, and device for detecting the electrical signal and time synchronization of a traveling wave ranging device. Background Technology

[0002] In the field of power system fault monitoring, it is necessary to collect and detect data on power equipment or lines in the power system. Among them, the collection of current data is a commonly used detection method. Many devices are therefore designed to detect the current in the circuit, so as to evaluate the current operating status of the system and facilitate timely remedial measures when data is abnormal.

[0003] With technological advancements, technologies utilizing current transmission for information and distance measurement have gradually emerged, such as traveling wave ranging devices. These devices can calculate the location of power faults by measuring the time difference in the transmission of current at a certain frequency through power cables, facilitating safe and efficient fault location and timely notification of maintenance personnel. These types of devices have high requirements for current detection, especially high-frequency and pulsed currents. This necessitates that manufacturers possess efficient, safe, and reliable detection methods during the research, development, testing, and after-sales stages.

[0004] For this type of equipment, as the complexity of product development and design increases, the accuracy of current detection in the conventional sense is no longer fully met market demands. The time characteristics of current waveforms and the time synchronization of detection signals between different devices have also been proposed.

[0005] Currently, the most common testing method involves manually capturing and comparing current waveforms using equipment such as oscilloscopes to calculate error data. While this method successfully obtains data, it is inefficient, time-consuming to manually adjust the equipment and conduct the testing process, and has high labor costs for batch testing. Secondly, there are some semi-automated testing methods, such as writing and developing a host computer program to automatically adjust the operation of the testing equipment and acquire data. However, this still cannot completely eliminate manual operation, and the consistency of results obtained by different operators varies greatly. In addition, if the testing equipment malfunctions and causes inaccurate results, it cannot be identified.

[0006] Therefore, this patented solution was proposed to better and more efficiently detect the performance of current signals and time synchronization detection functions of such devices in the production, R&D, and maintenance stages. Summary of the Invention

[0007] The present invention provides a method, apparatus and system for detecting the electrical signal and time synchronization of a traveling wave ranging device, which can at least solve one of the technical problems in the background art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for detecting the electrical signal and time synchronization of a traveling wave ranging device, the method comprising:

[0010] The current signal of the traveling wave ranging device under test is read by the detection system. The current signal is judged to be evenly distributed based on whether the current accuracy is qualified. If the current signal is evenly distributed, a single channel is selected to detect the time synchronization of the signal.

[0011] If the current signal is uneven, select multiple channels to adjust the signal. After the adjustment meets the standard, the time synchronization of the signal is detected.

[0012] Furthermore, the method for determining whether the current accuracy of the present invention is qualified includes,

[0013] Current accuracy = ((current value acquired by the device I1 - current value acquired by the AD acquisition module I2) / current value acquired by the AD acquisition module I2)) * 100%;

[0014] If the current accuracy is ≤0.5%, the electrical signal is qualified.

[0015] Furthermore, the multi-channel signal adjustment method of the present invention is as follows:

[0016] The detection system sets the adjustable loads LR1, LR2...LRn to 0 ohms and observes the changes in the electrical signal current value. By fine-tuning the adjustable loads LR1, LR2...LRn, the electrical signals between channels are made to achieve current sharing.

[0017] Furthermore, in this invention, if the current signal is unevenly distributed, the method for selecting multiple channels for signal time walking test is as follows:

[0018] S411, The control module closes KC1, KC2, K1...Kn to read the electrical signal of the traveling wave ranging device under test;

[0019] S412. Determine whether the current of the electrical signal of the traveling wave ranging device under test is equalized based on the current accuracy of the electrical signal of the traveling wave ranging device under test.

[0020] S413. If the electrical signal is uneven, keep the controllable switching devices KC1, KC2, K1...Kn closed; set the corresponding adjustable load LRn to 0 ohms; input voltage and resistance to the control signal input source and the adjustable load R1 respectively to output the required detection current signal.

[0021] S414. The control unit sets the clock synchronization between the device under test and the AD acquisition module to be consistent with GPS or BeiDou.

[0022] S415. Enter signal acquisition trigger mode: After setting the same trigger conditions for the device under test and the AD acquisition module, the control signal input source starts to output, and the device under test and the AD acquisition module synchronously trigger the acquisition signal and upload it to the control unit.

[0023] Control unit calculation data:

[0024] 1) Current accuracy = ((current acquired by the device under test I3 - current acquired by the AD module I2) / current acquired by the AD module I2)) * 100%

[0025] 2) Waveform time characteristic = ((Time characteristic of the device under test Tr3 - Time characteristic of the AD acquisition module Tr2) / Time characteristic of the AD acquisition module Tr2)) * 100%

[0026] S416 The control unit will set the judgment criteria for current accuracy and waveform time characteristics, and the time synchronization of each channel will be judged together to determine whether the requirements are met.

[0027] Furthermore, in this invention, if the current signal current sharing method selects a single channel for signal time walking test, the method is as follows:

[0028] S401, the control module closes KC1, KC2, K1…Kn to read the electrical signal of the traveling wave ranging device under test;

[0029] S402. Determine whether the electrical signal of the traveling wave ranging device under test is current-equalized based on the current accuracy of the electrical signal of the device under test.

[0030] S402. If the electrical signal is shared, select to keep only one channel n closed; set the corresponding adjustable load LRn to 0 ohms; input voltage and resistance to the control signal input source and the adjustable load R1 respectively, and output the required detection current signal in the loop.

[0031] S404. The control unit is used to set the clock synchronization between the device under test and the standard device to keep in line with GPS or Beidou.

[0032] S405. Enter signal acquisition trigger mode: Set the same trigger conditions for the device under test and the standard device, start the output of the control signal input source, and trigger the acquisition synchronously for the device under test and the standard device. They will report remote signals with time stamps to the control unit, and the control unit will start to calculate the time difference between the remote signal time stamps of the two devices.

[0033] S406, The control unit will have a time synchronization judgment standard set.

[0034] The standard is: the time synchronization is less than 100 ns. According to the calculation formula of time synchronization = (the time scale T1 of the standard device - the time scale T3 of the device under test), calculate the time difference and determine whether the time synchronization meets the requirements.

[0035] Further, the method of the present invention further includes judging the re-inspection of the traveling wave distance measuring device under test after the time synchronization detection is completed. The method is as follows:

[0036] Judge whether the device under test is qualified and whether the device under test needs to be replaced according to the time synchronization detection result of the device under test; if the device under test is qualified, encode the detection data, results and alarm information and upload them to the remote background server;

[0037] Among them, the background server collects test data, draws current waveforms and enters them into the database; when the test data accumulates to a certain extent, it is used to detect the performance status of the traveling wave distance measuring device under test, judge the life cycle of the traveling wave distance measuring device under test, and the output data is used for evaluation and analysis;

[0038] The method for judging the performance status of the traveling wave distance measuring device is as follows:

[0039] Adopt the current amplitude accuracy of the current waveform: X ≤ 0.5%

[0040] Rise time: T1 ≤ 5%

[0041] Fall time: T2 ≤ 5%

[0042] The specific method for judging the performance status of the sample is as follows:

[0043] When X ≤ 0.5%, T1 ≤ 5%, T2 ≤ 5%, it is the growth period; the performance has not decayed, meets the factory parameters, and can be continuously used for 5 years;

[0044] When 0.5% < X ≤ 5%, 5% < T1 ≤ 10%, 5% < T2 ≤ 10%, it is the mature period; the performance has a certain degree of decay and can be continuously used for 1 - 2 years;

[0045] When 5% < X ≤ 10%, 10% < T1 ≤ 20%, 10% < T2 ≤ 20%, it is the decay period; the performance decays severely and cannot be continuously used. The traveling wave distance measuring device under test is a defective product and should be immediately eliminated;

[0046] If the test device is replaced, the detection system will collect the electrical signals of the device under test and the standard device after replacement.

[0047] Further, the method of the present invention further includes the self - inspection method of the standard traveling wave distance measuring device before reading the electrical signal of the traveling wave distance measuring device under test. The method is as follows: [[ID=!]]

[0048] S201. Power on the device, enter the power - on self - inspection program, and click to enter the "self - inspection" mode;

[0049] S202. The system performs a program reset and checks whether all switches in device A are in the off state and whether all internal adjustable loads are in the open circuit state.

[0050] S203, The control module controls the closure of controllable switches KC1 and KC2, and sets the adjustable load R1 to a fixed resistance state;

[0051] S204. Set the acceptable range for self-inspection indicators;

[0052] S205, the control module controls the individual closure of K1, the adjustable load LR1 is set to 0Ω, the control signal input source outputs a self-test voltage, and a self-test current is generated in the main circuit, which flows through the acquisition CTT1 and CTT2;

[0053] At this point, the standard equipment and the AD acquisition module are triggered to synchronously acquire this current signal;

[0054] S206, standard equipment, and AD acquisition module upload the acquired data to the control unit for data calculation:

[0055] The specific calculation method is as follows:

[0056] Current accuracy = ((Standard equipment current value I1 - AD acquisition module current value I2) / AD acquisition module current value I2)) * 100%

[0057] Time characteristic = ((Standard equipment time characteristic Tr1 - AD acquisition module time characteristic Tr2) / AD acquisition module time characteristic Tr2)) * 100%

[0058] Time synchronization = (Standard equipment time stamp T1 - AD acquisition module time stamp T2)

[0059] S207. Disconnect K1, close K2, and set the adjustable load LR2 to 0Ω; perform self-test according to S204 and S205; repeat this step until Kn is closed, and complete the self-test for each channel.

[0060] S208. Disconnect all switches and set all adjustable loads LR1 to open circuit; the control unit performs a self-test to determine whether the indicators are met.

[0061] S209. Determine the self-test results.

[0062] On another aspect, the present invention proposes a traveling wave ranging device electrical signal and time synchronization detection system to implement the above-mentioned traveling wave ranging device electrical signal and time synchronization detection method. The traveling wave ranging device electrical signal and time synchronization detection system includes: a remote back-end server, a cloud platform, a mobile interactive terminal, a control unit, a detection device, a signal input source, and the device under test.

[0063] The signal input source is connected to the detection device, the detection device is connected to the control unit, the control unit is connected to the device under test via a communication bus, the mobile interactive terminal is connected to the cloud platform via a wired / wireless communication bus to the remote back-end server, the device under test is connected to the detection device, and the remote back-end server is connected to the control unit.

[0064] Furthermore, the detection device of the present invention includes multiple adjustable loads, multiple controllable switching devices, multiple current sensors, standard equipment, AD acquisition module, and control module;

[0065] Among them, one end of the controllable switching devices K1, K2, K3...Kn is connected to the corresponding current sensors CT1, CT2, CT3...CTn, and the other end is connected to the controllable switching device KC1, which is used as a switch and controlled by the control module.

[0066] Current sensors CT1, CT2, CT3...CTn are connected to corresponding adjustable loads LR1, LR2, LR3...LRn to detect the current in each branch circuit and transmit the acquired signal to the outside of the device; current sensor CTT1 is connected to the standard equipment and current sensor CTT2 is connected to the AD acquisition module to detect the current in the main circuit and transmit the acquired signal to the standard equipment and AD acquisition module.

[0067] The other end of the adjustable loads LR1, LR2, LR3...LRn is connected to the current sensor CTT1, which is used to regulate the current in each branch.

[0068] One end of the adjustable load R1 is connected to the current sensor CTT2, and the other end is connected to the controllable switching device KC2, which is used to regulate the current in the main circuit;

[0069] The control module is connected to controllable switching devices KC1, KC2, K1, K2, K3…Kn via control lines for controlling the controllable switching devices;

[0070] The AD acquisition module converts analog signals into digital signals and transmits the output in real time via a bus.

[0071] In another aspect, the present invention also discloses a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the method described above.

[0072] As can be seen from the above technical solution, the present invention, through the design of a method and system for detecting the electrical signal and time synchronization of a traveling wave ranging device, can detect current accuracy and time synchronization separately or simultaneously according to requirements; it meets the requirements of automated detection and reduces labor costs during batch detection; it can support single-channel and multi-channel signal access detection, thus having better adaptability; the device has a self-testing function, which can promptly push alarm information to relevant personnel for timely repair in case of failure; it has good human-machine interaction functions, allowing remote viewing, operation, and analysis of data. Attached Figure Description

[0073] Figure 1 A standard current waveform characteristic curve;

[0074] Figure 2 This is a schematic diagram of the waveform for time synchronization detection.

[0075] Figure 3 This is a schematic diagram of the signal detection system structure of the present invention;

[0076] Figure 4 This is a schematic diagram of the control unit structure of the present invention;

[0077] Figure 5 This is a schematic diagram of the detection device A of the present invention;

[0078] Figure 6 This is a schematic diagram of the current flow direction during the self-test of the device of the present invention;

[0079] Figure 7 This is a schematic diagram of the current flow direction during single-channel time synchronization detection in this invention;

[0080] Figure 8 This is a schematic diagram of the current flow direction during multi-channel time synchronization detection in this invention;

[0081] Figure 9 This is a schematic diagram of the current flow direction during single-channel current accuracy + time synchronization detection according to the present invention;

[0082] Figure 10 This is a schematic diagram of the current flow direction during multi-channel current accuracy + time synchronization detection according to the present invention;

[0083] Figure 11 This is a schematic diagram of the process for detecting the electrical signal and time synchronization of the traveling wave ranging device according to the present invention. Detailed Implementation

[0084] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0085] This solution can automatically test three aspects of the device under test: current accuracy, waveform time characteristics, and time synchronization between different devices. These three aspects will be introduced one by one below:

[0086] Using a standard signal source as the current input, both this solution and the device under test acquire this signal X and compare them.

[0087] 1) Current accuracy: The current value collected by the device under test is the sampled value A, and the current value collected by this scheme is the true value B. Then the relative error between A and B is calculated as |((AB) / B)*100%|.

[0088] 2), such as Figure 1 As shown, the time characteristics of the waveform are set. The trigger condition is set (I≧5A). When the current amplitude of signal X reaches the condition, the current waveforms of the device under test and the current waveforms acquired by this scheme are captured simultaneously. The time characteristic parameters (rise time, half-wave time, etc.) of the waveforms are calculated respectively. The time characteristic parameters calculated by this scheme are taken as the true value C, and the time characteristic parameters of the device under test are taken as the sampled value D. The relative error is calculated as |((DC) / C)*100%|.

[0089] 3) Time Synchronization: Set a trigger condition (e.g., I ≥ 5A). When the current amplitude of signal X reaches the condition, simultaneously capture the current waveforms acquired by the device under test (DUT) and this solution. After successful capture, both the DUT and this solution will upload a time stamp. Comparing the time difference between these two time stamps determines the time synchronization between different devices. Using the time stamp uploaded by this solution as the true value E and the DUT time stamp as the sampled value F, the time synchronization between different devices is calculated as |FE|. The synchronization waveform is shown below. Figure 2 As shown.

[0090] The method for detecting the electrical signal and time synchronization of the traveling wave ranging device described in this embodiment includes the following steps:

[0091] S100. Build a detection system for the electrical signal and time synchronization of traveling wave ranging equipment, perform self-test of standard traveling wave ranging equipment, and determine whether the self-test of standard traveling wave ranging equipment passes.

[0092] S200. If the equipment completes its self-test, the test method can be selected through the controllable module.

[0093] S300. After determining the testing method, select the item to be tested;

[0094] S400: Perform signal acquisition to obtain the signal curve of the item to be detected;

[0095] S500: Determine whether the item to be tested meets the requirements based on the data signal curve of the item to be tested;

[0096] S600. If the items to be tested meet the requirements, determine whether the equipment needs to continue testing.

[0097] S700. If further detection is required, repeat steps S300-S500. If further detection is not required, encode the detection data, results, alarm information, etc., and upload them to the remote backend server via wired or wireless means.

[0098] The S800 and the backend server then decode, process, and analyze the data before pushing it to the mobile interactive terminal and cloud platform for display and plotting current data waveforms. Simultaneously, if any alarm information is detected, it will notify the mobile interactive terminal and cloud platform in real time to remind maintenance personnel to handle the issue.

[0099] The following is a detailed explanation of the steps:

[0100] Build a detection system for the electrical signal and time synchronization of the traveling wave ranging equipment and perform equipment self-test;

[0101] like Figure 3 As shown, the traveling wave ranging device electrical signal and time synchronization detection system of the present invention includes a remote back-end server, a cloud platform, a mobile interactive terminal, a control unit, a detection device A, a signal input source, and the device under test;

[0102] The signal input source is connected to the detection device, the detection device is connected to the control unit, the control unit is connected to the device under test via a communication bus, the mobile interactive terminal is connected to the cloud platform via a wired / wireless communication bus to the remote back-end server, the device under test is connected to the detection device, and the remote back-end server is connected to the control unit.

[0103] like Figure 4 As shown, the control unit is the core control board that can acquire data sent by other modules, collect and package it for uploading; at the same time, it issues instructions to each module and collects feedback information from the modules, serving as the control center.

[0104] Specifically, it includes: an AD sampling chip, remote signaling circuit and interface, SRAM storage, a 4 / 5G module, a network communication module, a RS-232 interface, a watchdog circuit, a clock circuit, a FLASH chip, and a crystal oscillator circuit. The AD chip module supports voltage and current data input acquisition; the RS-232 interface and network communication are compatible with most instrument and equipment communication interfaces; the remote signaling circuit and interface can be matched with the interfaces of the device under test and standard equipment; it has a storage unit and an MCU for data storage and calculation; it has an antenna and a 4 / 5G module for wireless communication, uploading data to a remote backend server; and it includes conventional circuits such as a watchdog timer, clock circuit, FLASH chip, and crystal oscillator circuit.

[0105] like Figure 5As shown, the detection device A is generally connected in series in the main circuit. The external interface mainly includes a current input channel (input P+ / input P-), one or N current signal acquisition outputs (used for acquisition by the device under test), and one or more communication buses for signal transmission.

[0106] The detection device A includes multiple adjustable loads, multiple controllable switching devices, multiple current sensors, standard equipment, an AD acquisition module, and a control module;

[0107] Among them, controllable switching devices K1, K2, K3…Kn are connected at one end to the corresponding current sensors CT1, CT2, CT3…CTn, and at the other end to controllable switching device KC1 (which can be increased appropriately according to the number of channels), used as switches and controlled by the control module; current sensors CT1, CT2, CT3…CTn are connected to the corresponding adjustable loads LR1, LR2, LR3…LRn, used to detect the current in each branch circuit and transmit the acquired signal to the outside of the device; current sensor CTT1 is connected to the standard equipment, and current sensor CTT2 is connected to the AD acquisition module, used to detect the current in the main circuit and transmit the acquired signal to the standard equipment and the AD acquisition module; adjustable load LR1… LR2, LR3…LRn are connected at one end to current sensor CTT1, used to regulate the current in each branch, and can be controlled by the control module; the adjustable load R1 is connected at one end to current sensor CTT2, and at the other end to controllable switch KC2, used to regulate the current in the main circuit, and can be controlled by the control module; the control module is connected to controllable switch KC1, KC2, K1, K2, K3…Kn via control lines for controlling the controllable switch; a standard device, essentially a qualified test product, is used as a standard component for time synchronization detection in conjunction with the test device; the AD acquisition module can convert analog signals into digital signals and transmit the output in real time via the bus.

[0108] Generally, during normal use, the current signal always starts by entering the detection device A from input P+ / input P-. After the current sensor detects the high-frequency current, it will transmit the sampling signal to the device under test, the labeling device, and the AD acquisition module respectively. At the same time, it will communicate with the outside world through the communication bus signal to transmit the acquired data. After receiving the data, the external device will process and analyze it, and can control the detection device A through the communication bus signal to achieve closed-loop operation.

[0109] The detection system also includes one or more of the detection devices A described above, a signal input source, and one or more devices under test;

[0110] Among them, the current signal input device can be controlled by the control module through the communication bus; one or more devices under test (e.g., traveling wave ranging devices) are the objects of our detection, and the number depends on the number of sampling channels in the detection device A, which can be appropriately increased; a control unit, as the control center, can control the online devices through the communication bus, and can also calculate, process and analyze the data transmitted by the online devices, and receive remote signaling information (such as alarm information) uploaded by the online devices and transmit it to the remote back-end server through wired / wireless means; a remote back-end server is used to classify and organize the signals uploaded by the control unit, display waveforms, etc., and can push the information to the human-machine interface, such as mobile interactive terminals, cloud platforms, etc., and can receive instructions to the control unit, and perform some controlled operations after some authorized judgments.

[0111] The remote backend server, cloud platform, and mobile interactive terminal can perform three functions:

[0112] 1) The detection data uploaded by the coupled control unit is output as a detection data report and stored in the database for retrieval and data backtracking, which facilitates the location of problems in production or detection.

[0113] 2) Monitor the operating status of the entire system in real time, report any abnormalities to maintenance personnel for handling, support remote operation, and handle production problems in a timely manner;

[0114] 3) The testing equipment can perform self-tests. When the equipment or system malfunctions, it can upload fault information to the remote backend server, notify maintenance personnel to carry out timely repairs, avoid production stoppages, and reduce production costs.

[0115] like Figure 6 The diagram shows the current flow direction during self-testing of the traveling wave ranging equipment's electrical signal and time synchronization detection system. The specific self-testing method is as follows:

[0116] S201. Power on the device and enter the power-on self-test program. Click to enter the "self-test" mode.

[0117] S202. The system performs a program reset and checks whether all switches in device A are in the off state and whether all internal adjustable loads are in the open circuit state.

[0118] S203, The control module controls the closure of controllable switches KC1 and KC2, and sets the adjustable load R1 to a fixed resistance state;

[0119] S204. Set the acceptable range for self-inspection indicators and make it adjustable;

[0120] For example: 1. Current accuracy is 5%.

[0121] 2. Time characteristic deviation = 10%

[0122] 3. Time synchronization ≤ 100ns.

[0123] The maximum accuracy range is:

[0124] 1. Current accuracy is 0.5%.

[0125] 2. Time characteristic deviation = 5%

[0126] 3. Time synchronization ≤ 100ns.

[0127] S205, the control module controls the individual closure of K1 (or Kn), the adjustable load LR1 (or LRn) is set to 0Ω, the control signal input source outputs a self-test voltage, and a current for self-test is generated in the main circuit, which flows through the acquisition CTT1 and CTT2;

[0128] At this point, the standard equipment and the AD acquisition module are triggered to synchronously acquire this current signal;

[0129] S206, standard equipment, and AD acquisition module upload the acquired data to the control unit for data calculation:

[0130] Current accuracy = ((Standard equipment current value I1 - AD acquisition module current value I2) / AD acquisition module current value I2)) * 100%

[0131] Time characteristic = ((Standard equipment time characteristic Tr1 - AD acquisition module time characteristic Tr2) / AD acquisition module time characteristic Tr2)) * 100%

[0132] Time synchronization = (Standard equipment time stamp T1 - AD acquisition module time stamp T2)

[0133] S207. Disconnect K1, close K2, and set the adjustable load LR2 to 0Ω; perform self-test according to S204 and S205; repeat this step until Kn is closed, and complete the self-test for each channel.

[0134] S208. Disconnect all switches and set all adjustable loads LR1 (or LRn) to open circuit; the control unit performs a self-test to determine whether the specifications are met.

[0135] S209. Determine the self-test results;

[0136] If the self-test passes, the testing method will be selected; if the self-test fails, the testing will stop, the equipment will be in standby mode, and a device fault alarm will be reported. A timer will be set and the equipment will wait for processing. After the timer expires, the fault and data will be uploaded to the remote backend server, which will then send them to the cloud platform and human-machine interface terminal to promptly remind maintenance personnel to check and repair.

[0137] S300. After determining the testing method, select the item to be tested and determine the working mode;

[0138] The detection methods are divided into single-channel detection and multi-channel detection;

[0139] The specific items to be tested include: time synchronization and time characteristics;

[0140] The operating modes include: single-channel time synchronization detection, multi-channel time synchronization detection, single-channel current accuracy + time synchronization detection, and multi-channel current accuracy + time synchronization detection.

[0141] The electrical signals of the tested equipment and the standard equipment are read by the electrical signal and time synchronization detection system of the traveling wave ranging equipment. The current accuracy of the electrical signal of the tested equipment is used to determine whether the current signal is evenly distributed.

[0142] S400: Perform signal acquisition to obtain the signal curve of the item to be detected;

[0143] S500: Determine whether the item to be tested meets the requirements based on the data signal curve of the item to be tested;

[0144] The following describes steps S400 and S500 using two different operating modes;

[0145] like Figure 7 Figure 9 The diagram shown illustrates the current flow in single-channel operating mode. The single-channel time synchronization detection method is as follows:

[0146] S401, the control module closes KC1, KC2, K1…Kn to read the electrical signal of the traveling wave ranging device under test;

[0147] S402. Determine whether the electrical signal of the traveling wave ranging device under test is current-equalized based on the current accuracy of the electrical signal of the device under test.

[0148] S402. If the electrical signal is to be shared, select to keep only one channel n closed (e.g., n=1); set the corresponding adjustable load LRn to 0 ohms; input voltage and resistance to the control signal input source and the adjustable load R1 respectively, and output the required detection current signal in the loop.

[0149] S404. The control unit is used to set the clock synchronization between the device under test and the standard device to keep in line with GPS or Beidou.

[0150] S405. Enter signal acquisition trigger mode: Set the same trigger conditions (e.g., current ≥ 5A) for the device under test and the standard device. The control signal input source starts to output, and the device under test and the standard device trigger acquisition synchronously. They will report remote signals with time stamps to the control unit, and the control unit will start to calculate the time difference between the remote signal time stamps of the two devices.

[0151] S406. The control unit will set a time synchronization judgment standard (e.g., the standard is: time synchronization is less than 100ns). According to the calculation formula of time synchronization = (standard equipment time scale T1 - tested equipment time scale T3), the time difference is calculated and it is judged whether the time synchronization meets the requirements.

[0152] S407. If the requirements are not met, report the test failure mark, wait for processing within the set time, upload the data after the timeout, and proceed to the next step; if the requirements are met, this test is completed and you can proceed directly to the next step.

[0153] like Figure 8 Figure 10 The diagram shown is a schematic of the current flow in operating mode 2. Operating mode 3, multi-channel current accuracy + time synchronization detection method:

[0154] S411, The control module closes KC1, KC2, K1...Kn to read the electrical signal of the traveling wave ranging device under test;

[0155] S412. Determine whether the current of the electrical signal of the traveling wave ranging device under test is equalized based on the current accuracy of the electrical signal of the traveling wave ranging device under test.

[0156] S413. If the electrical signal is uneven, keep the controllable switching devices KC1, KC2, K1...Kn closed; set the corresponding adjustable load LRn to 0 ohms; input voltage and resistance to the control signal input source and the adjustable load R1 respectively to output the required detection current signal.

[0157] S414 The control unit sets the clock synchronization between the device under test and the AD acquisition module to be consistent with GPS or Beidou.

[0158] S415. Enter signal acquisition trigger mode: After setting the same trigger conditions for the device under test and the AD acquisition module, the control signal input source starts to output, and the device under test and the AD acquisition module synchronously trigger the acquisition signal and upload it to the control unit.

[0159] Control unit calculation data:

[0160] 1) Current accuracy = ((current acquired by the device under test I3 - current acquired by the AD module I2) / current acquired by the AD module I2)) * 100%

[0161] 2) Waveform time characteristic = ((Time characteristic of the device under test Tr3 - Time characteristic of the AD acquisition module Tr2) / Time characteristic of the AD acquisition module Tr2)) * 100%

[0162] S416 The control unit will set judgment criteria for current accuracy and waveform time characteristics (such as 10%), and the time synchronization of each channel will be judged together to determine whether the requirements are met.

[0163] If the requirements are not met, report the test failure, wait for processing within the set time, upload the fault and data after the timeout, and proceed to the next step; if the requirements are met, this test is completed and you can proceed to the next step.

[0164] S600. If the items to be tested meet the requirements, determine whether the equipment needs to continue testing.

[0165] The system determines whether the device needs to continue testing. This occurs when retesting the same sample or testing other items. If the system chooses to continue testing, it will redirect the user from the test item selection point and continue testing. If the system does not choose to continue testing, it will proceed to the next step.

[0166] Determining whether to change the test sample usually occurs when testing multiple samples in batches. If the option to change the test sample is selected, the system will re-enter the test from the test method selection point and perform the test again; if the test is not continued, it will proceed to the next step.

[0167] S700. If further detection is required, repeat steps S300-S500. If further detection is not required, encode the detection data, results, alarm information, etc., and upload them to the remote backend server via wired or wireless means.

[0168] The control unit encodes the detection data, results, and alarm information, and uploads them to the remote backend server via wired or wireless means. The backend server then decodes, processes, and analyzes the data, and pushes it to the mobile interactive terminal and cloud platform for display, plotting the current data waveform. At the same time, if any alarm information is detected, it notifies the mobile interactive terminal and cloud platform in real time, reminding maintenance personnel to handle the situation.

[0169] The S800 and the backend server then decode, process, and analyze the data before pushing it to the mobile interactive terminal and cloud platform for display and plotting current data waveforms. Simultaneously, if any alarm information is detected, it will notify the mobile interactive terminal and cloud platform in real time to remind maintenance personnel to handle the issue.

[0170] The backend server collects test data, plots current waveforms, and enters them into the database. When the test data accumulates to a certain level, it is used to detect the performance status of the tested traveling wave ranging device, determine the life cycle of the tested traveling wave ranging device, and output data for evaluation and analysis.

[0171] Among them, the method for judging the performance state of the traveling wave ranging device is as follows:

[0172] Adopt the current amplitude accuracy of the current waveform: X ≤ 0.5%

[0173] Rise time: T1 ≤ 5%

[0174] Fall time: T2 ≤ 5%

[0175] Specifically, the method for judging the performance state of the sample is as follows:

[0176] When X ≤ 0.5%, T1 ≤ 5%, and T2 ≤ 5%, it is the growth period; the performance has not decayed, meets the factory parameters, and can be continuously used for 5 years;

[0177] When 0.5% < X ≤ 5%, 5% < T1 ≤ 10%, and 5% < T2 ≤ 10%, it is the mature period; the performance has a certain degree of decay and can be continuously used for 1 - 2 years;

[0178] When 5% < X ≤ 10%, 10% < T1 ≤ 20%, and 10% < T2 ≤ 20%, it is the decay period; the performance decay is serious, it cannot be continuously used, it is considered a defective product, and it needs to be immediately eliminated.

[0179] In summary, the present invention designs a method and system for detecting the electrical signal and time synchronization of a traveling wave ranging device, which can separately or simultaneously detect the current accuracy and time synchronization according to requirements; meet automated detection and reduce labor costs during batch detection; support single-channel and multi-channel signal access detection, with better adaptability; the device has a self-check function and can promptly push alarm information to relevant personnel for timely maintenance when a fault occurs; it has a good human-computer interaction function and can view, operate, and analyze data remotely.

[0180] On the other hand, the present invention also discloses a computer device, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of the above method. <00​​​​​​In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk (SSD)).

[0184] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0185] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0186] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting the electrical signal and time synchronization of a traveling wave ranging device, characterized in that, The methods include: The current signal of the traveling wave ranging device under test is read by the detection system. The current signal is judged to be evenly distributed based on whether the current accuracy is qualified. If the current signal is evenly distributed, a single channel is selected to detect the time synchronization of the signal. If the current signal is uneven, select multiple channels to adjust the signal. After the adjustment meets the standard, then perform signal time synchronization detection. The method for signal adjustment across multiple channels is as follows: The detection system sets the adjustable loads LR1, LR2...LRn to 0 ohms and observes the changes in the electrical signal current value. By fine-tuning the adjustable loads LR1, LR2...LRn, the electrical signals between channels are made to achieve current sharing. The detection system includes a detection device, the device under test is connected to the detection device, and the detection device includes multiple adjustable loads, multiple controllable switching devices, multiple current sensors, standard equipment, AD acquisition module, and control module. Among them, one end of the controllable switching devices K1, K2, K3...Kn is connected to the corresponding current sensors CT1, CT2, CT3...CTn, and the other end is connected to the controllable switching device KC1, which is used as a switch and controlled by the control module. Current sensors CT1, CT2, CT3…CTn are connected to corresponding adjustable loads LR1, LR2, LR3…LRn to detect the current signal of the traveling wave ranging device in each channel and transmit the acquired signal to the outside of the device; current sensor CTT1 is connected to the standard device and current sensor CTT2 is connected to the AD acquisition module to detect the current in the main circuit and transmit the acquired signal to the standard device and AD acquisition module. The other end of the adjustable loads LR1, LR2, LR3...LRn is connected to the current sensor CTT1, which is used to regulate the current in each branch. One end of the adjustable load R1 is connected to the current sensor CTT2, and the other end is connected to the controllable switching device KC2, which is used to regulate the current in the main circuit; The control module is connected to the controllable switching devices KC1, KC2, K1, K2, K3…Kn via control lines for controlling the controllable switching devices; The AD acquisition module converts analog signals into digital signals and transmits the output in real time via a bus.

2. The method for detecting the electrical signal and time synchronization of a traveling wave ranging device according to claim 1, characterized in that, Methods for judging whether the current accuracy is qualified include: Current accuracy = ((current value I1 acquired by the device under test - current value I2 acquired by the AD acquisition module) / current value I2 acquired by the AD acquisition module)) * 100%; If the current accuracy is ≤0.5%, the electrical signal is qualified.

3. The method for detecting the electrical signal and time synchronization of a traveling wave ranging device according to claim 1, characterized in that, If the current signal is unevenly distributed, the method for selecting multiple channels for signal time walking test is as follows: S411, The control module closes KC1, KC2, K1...Kn to read the electrical signal of the traveling wave ranging device under test; S412. Determine whether the current of the electrical signal of the traveling wave ranging device under test is equalized based on the current accuracy of the electrical signal of the traveling wave ranging device under test. S413. If the electrical signal is uneven, keep the controllable switching devices KC1, KC2, K1...Kn closed; set the corresponding adjustable load LRn to 0 ohms; input voltage and resistance to the control signal input source and the adjustable load R1 respectively to output the required detection current signal. S414. The control unit sets the clock synchronization between the device under test and the AD acquisition module to be consistent with GPS or BeiDou. S415. Enter signal acquisition trigger mode: After setting the same trigger conditions for the device under test and the AD acquisition module, the control signal input source starts to output, and the device under test and the AD acquisition module synchronously trigger the acquisition signal and upload it to the control unit. Control unit calculation data: 1) Current accuracy = ((current acquired by the device under test I3 - current acquired by the AD module I2) / current acquired by the AD module I2)) * 100% 2) Waveform time characteristic = ((Time characteristic Tr3 of the device under test - Time characteristic Tr2 of the AD acquisition module) / Time characteristic Tr2 of the AD acquisition module)) * 100% S416 The control unit will set the judgment criteria for current accuracy and waveform time characteristics, and the time synchronization of each channel will be judged together to determine whether the requirements are met.

4. The method for detecting the electrical signal and time synchronization of a traveling wave ranging device according to claim 1, characterized in that, If current signal current sharing is selected for single-channel signal time walking test, the method is as follows: S401, the control module closes KC1, KC2, K1…Kn to read the electrical signal of the traveling wave ranging device under test; S402. Determine whether the electrical signal of the traveling wave ranging device under test is current-equalized based on the current accuracy of the electrical signal of the device under test. S402. If the electrical signal is shared, select to keep only one channel n closed; set the corresponding adjustable load LRn to 0 ohms; input voltage and resistance to the control signal input source and the adjustable load R1 respectively, and output the required detection current signal in the loop. S404. The control unit is used to set the clock synchronization between the device under test and the standard device to keep in line with GPS or Beidou. S405. Enter signal acquisition trigger mode: Set the same trigger conditions for the device under test and the standard device, start the output of the control signal input source, and trigger the acquisition synchronously for the device under test and the standard device. They will report remote signals with time stamps to the control unit, and the control unit will start to calculate the time difference between the remote signal time stamps of the two devices. S406, The control unit will have a time synchronization judgment standard set. The standard is: time synchronization is less than 100ns. According to the calculation formula of time synchronization = (standard equipment time scale T1 - tested equipment time scale T3), the time difference is calculated and it is determined whether the time synchronization meets the requirements.

5. The method for detecting the electrical signal and time synchronization of a traveling wave ranging device according to claim 1, characterized in that, This also includes determining whether the tested traveling wave ranging device needs to be re-inspected after the time synchronization test is completed. The method is as follows: Based on the time synchronization test results of the tested equipment, determine whether the tested equipment is qualified and whether it needs to be replaced; if the tested equipment is qualified, encode the test data, results, and alarm information and upload them to the remote backend server. The backend server collects test data, plots current waveforms, and enters them into the database. When the test data accumulates to a certain level, it is used to detect the performance status of the tested traveling wave ranging device, determine the life cycle of the tested traveling wave ranging device, and output data for evaluation and analysis. The method for judging the performance status of traveling wave ranging equipment is as follows: The accuracy of the current amplitude in the current waveform is: X≤0.5%. Rise time: T1≤5% Descent time: T2≤5% The specific steps for determining the performance status of a sample are as follows: When X ≤ 0.5%, T1 ≤ 5%, and T2 ≤ 5%, it is the growth period; the performance has not decayed, meets the factory parameters, and can be continuously used for 5 years; When 0.5% < X ≤ 5%, 5% < T1 ≤ 10%, and 5% < T2 ≤ 10%, it is the mature period; the performance has a certain degree of decay and can be continuously used for 1 - 2 years; When 5% < X ≤ 10%, 10% < T1 ≤ 20%, and 10% < T2 ≤ 20%, it is the decay period; the performance decays severely and cannot be continuously used. The measured traveling wave distance measuring device is a defective product and should be immediately eliminated; If the test equipment is replaced, the detection system will collect the electrical signals of the tested device and the standard device after replacement.

6. The method for detecting the electrical signal and time synchronization of a traveling wave ranging device according to claim 1, characterized in that, It also includes a self - checking method for the standard traveling wave distance measuring device before reading the electrical signal of the measured traveling wave distance measuring device, which is as follows: S201. Power on the device, enter the power - on self - checking program, and click to enter the "self - checking" mode; S202. The system resets the program, and checks whether all the switches in detection device A are in the off state and whether all the internal adjustable loads are in the open - circuit state; S203. The control module controls the closing of controllable switches KC1 and KC2, and sets the adjustable load R1 to a fixed - resistance state; S204. Set the qualified range of self - checking indicators; S205. The control module controls the separate closing of K1, sets the adjustable load LR1 to 0Ω, controls the signal input source to output the self - checking voltage, and a current for self - checking will be generated in the main circuit, flowing through the acquisition CTT1 and CTT2; At this time, the standard device and the AD acquisition module are triggered to synchronously collect this current signal; S206. The standard device and the AD acquisition module upload the collected data to the control unit for data calculation: The specific calculation method is as follows: Current accuracy = ((the current value I1 collected by the standard device - the current value I2 collected by the AD acquisition module) / the current value I2 collected by the AD acquisition module)) * 100% Time characteristic = ((the time characteristic Tr1 of the standard device - the time characteristic Tr2 of the AD acquisition module) / the time characteristic Tr2 of the AD acquisition module)) * 100% Time synchronization = (the time scale T1 of the standard device - the time scale T2 of the AD acquisition module) S207. Open K1, close K2, and set the adjustable load LR2 to 0Ω; perform self - checking according to S204 and S205; repeat this step until Kn is closed and each channel is self - checked; S208. Open all the switches, set the adjustable load LR1 to the open - circuit state; the control unit judges whether the self - checking meets the indicators; S209. Judge the self - checking result.

7. A system for detecting the electrical signal and time synchronization of a traveling wave ranging device, used to implement the method for detecting the electrical signal and time synchronization of a traveling wave ranging device as described in any one of claims 1-6, characterized in that, The traveling wave distance measuring device electrical signal and time synchronization detection system further includes: a remote background server, a cloud platform, a mobile interaction terminal, a control unit, a signal input source, and a tested device; The signal input source is connected to the detection device, the detection device is connected to the control unit, the control unit is connected to the tested device through a communication bus, the mobile interaction terminal and the cloud platform are connected to the remote background server through a wired / wireless communication bus, and the remote background server is connected to the control unit.

8. A computer device comprising a memory and a processor, characterized in that, The memory stores a computer program, and when the computer program is executed by the processor, the processor executes the method described in any one of claims 1 - 6.

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