Traveling wave distance measurement equipment electric signal and time synchronization detection method, system and device

Abstract

The invention discloses a traveling wave distance measurement equipment electric signal and time synchronization detection method, system and device, and the method comprises the steps: building a traveling wave distance measurement equipment electric signal and time synchronization detection system, carrying out the equipment self-inspection, and carrying out the selection of a detection mode and a to-be-detected item through a controllable module when the equipment self-inspection is completed; further performing signal acquisition to obtain a to-be-detected item data signal curve graph; judging whether the to-be-detected item reaches the standard according to the to-be-detected item data signal curve graph; when the detection item reaches the standard, judging whether the equipment needs to be continuously detected or not; if detection does not need to be continued, detection data, results, alarm information and the like are coded and uploaded to a remote background server in a wired or wireless mode for data decoding, then sorting and analysis are conducted, current data waveforms are drawn and input into a database, and when the test data are accumulated to a certain degree, the test data are used for detecting the performance state of the detected traveling wave distance measurement equipment. And the life cycle of the detected traveling wave distance measurement equipment is judged.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment detection, and in particular to a method, system and device for detecting electrical signals and time synchronization of traveling wave ranging equipment. Background Art

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

[0003] With the advancement of technology, technologies that use current transmission for information and distance measurement have gradually emerged, such as traveling wave ranging equipment, which can use the time difference of a certain frequency of current in the power cable to calculate the location of the power fault, which is convenient for safely and efficiently locating the fault point and notifying maintenance personnel in time to handle it. This type of equipment has high requirements for current detection, especially high-frequency current and pulse current, which requires manufacturers to have efficient, safe and reliable detection methods in the research and development, testing and after-sales stages.

[0004] For this type of equipment, as the complexity of product development and design increases, the current accuracy of detection in the conventional sense can no longer fully meet market demand. The time characteristics of the current waveform and the time synchronization of detection signals between different devices have also been raised.

[0005] Currently, the most commonly used detection method is to manually operate an oscilloscope and other equipment to manually capture the current waveform for comparison and calculate the error data. Although this method successfully obtains data, it is inefficient, and the manual adjustment of equipment and the detection process are time-consuming. In batch detection, the labor cost is high; secondly, there are also some semi-automatic detection methods, such as writing a host computer program for secondary development, automatically adjusting the detection equipment to run and obtain data, but this method cannot be completely separated from manual operation. The consistency of the results obtained by different personnel is also quite different; at the same time, if there is a problem with the detection equipment that causes inaccurate results, it cannot be identified.

[0006] Therefore, in order to better efficiently and automatically detect the performance of the current signal and time synchronization detection function of such equipment in the production, R&D and maintenance stages, this patent solution is proposed. Summary of the invention

[0007] The present invention provides a method, device 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 technology.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

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

[0010] The current signal of the traveling wave ranging device to be tested is read through the detection system, and whether the current signal is current-balanced is determined based on whether the current accuracy is qualified. If the current signal is current-balanced, a single channel is selected to perform time synchronization detection of the signal;

[0011] If the current signal is not evenly distributed, select multiple channels to adjust the signal. After the adjustment meets the standard, perform time synchronization detection on the signal.

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

[0013] Current accuracy = ((current value collected by the device I1-current value collected by the AD acquisition module I2) / current value collected 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:

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

[0017] Furthermore, in the present invention, if the current signal is not evenly distributed, the method for selecting multiple channels to perform a signal time walking test is:

[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, judging whether the electric signal of the traveling wave ranging device under test has a current balance according to the current accuracy of the electric signal of the traveling wave ranging device under test;

[0020] S413, if the electrical signal is not current-balanced, keep the controllable switch devices KC1, KC2, K1...Kn closed; set the corresponding adjustable load LRn to 0 ohm; control the signal input source and the adjustable load R1 to input voltage and resistance respectively to output the required detection current signal.

[0021] S414, the control unit sets the clock synchronization of the device under test and the AD acquisition module to be consistent with GPS or Beidou;

[0022] S415, entering the signal acquisition trigger mode: after setting the same trigger conditions for the device under test and the AD acquisition module, the signal input source is controlled to start output, and the device under test and the AD acquisition module synchronously trigger the acquisition signal and upload it to the control unit;

[0023] The control unit calculates data:

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

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

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

[0027] Furthermore, in the present invention, if the current signal is current-balanced and a single channel is selected to perform a signal time walking test method, the method is:

[0028] S401, the control module closes KC1, KC2, K1...Kn, and reads the electrical signal of the traveling wave ranging device under test;

[0029] S402, judging whether the electric signal of the traveling wave ranging device under test has a current balance according to the current accuracy of the electric signal of the traveling wave ranging device under test;

[0030] S402, if the electrical signal is current-balanced, select and keep a single channel n closed; set the corresponding adjustable load LRn to 0 ohm; control the signal input source and the adjustable load R1 to input voltage and resistance respectively, and output the required detection current signal in the loop;

[0031] S404, setting the clock of the device under test and the standard device to be synchronized with GPS or Beidou through the control unit;

[0032] S405, enter the signal acquisition trigger mode: set the same trigger conditions for the device under test and the standard device, control the signal input source to start output, the device under test and the standard device trigger acquisition synchronously, and report the telesignal with time stamp to the control unit respectively, and the control unit starts to calculate the time difference between the telesignal time stamps of the two;

[0033] S406, the control unit will set the time synchronization judgment standard

[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 also 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 output data 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%, 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;

[0044] 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;

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

[0046] If the test equipment 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 also 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:

[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 to detect whether all switches in device A are in a disconnected state and all internal adjustable loads are in an open circuit state;

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

[0051] S204, setting the qualified range of self-inspection indicators;

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

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

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

[0055] The specific calculation method is:

[0056] Current accuracy = ((current value collected by standard equipment I1-current value collected by AD acquisition module I2) / current value collected by AD acquisition module 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 T1-AD acquisition module time 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 each channel is self-tested;

[0060] S208, disconnect all switches, and set the adjustable load LR1 to an open circuit state; the control unit determines whether the self-test meets the indicators;

[0061] S209: Determine the self-test result.

[0062] On the other hand, the present invention proposes a traveling wave ranging device electrical signal and time synchronization detection system, which is used to implement the above-mentioned traveling wave ranging device electrical signal and time synchronization detection method, and the traveling wave ranging device electrical signal and time synchronization detection system includes: a remote background server, a cloud platform, a mobile interactive terminal, a control unit, a detection device, a signal input source, and a 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 through a communication bus, the mobile interactive terminal and the cloud platform are connected to the remote background server through a wired / wireless communication bus, the device under test is connected to the detection device, and the remote background server is connected to the control unit.

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

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

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

[0067] The other end of the adjustable loads LR1, LR2, LR3…LRn is connected to the current sensor CTT1, which is used to control 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 switch device KC2, which is used to adjust the current in the main circuit;

[0069] The control module is connected to the controllable switch devices KC1, KC2, K1, K2, K3...Kn through control lines, and is used to control the controllable switch devices;

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

[0071] On the other hand, the present invention further 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 executes the steps of the above method.

[0072] It can be seen from the above technical scheme that the present invention, by designing a method and system for detecting the electrical signal and time synchronization of traveling wave ranging equipment, can detect the current accuracy and time synchronization separately or simultaneously according to needs; meet the needs of automated detection and reduce labor costs during batch detection; can support single-channel and multi-channel signal access detection with better adaptability; the equipment has a self-checking function, which can promptly push alarm information to relevant personnel for timely maintenance in case of failure; has good human-computer interaction function, and can remotely view, operate and analyze data. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 It is a standard current waveform characteristic curve diagram;

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

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

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

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

[0078] Figure 6 A schematic diagram of the current flow during the self-test of the device of the present invention;

[0079] Figure 7 A schematic diagram of current flow during single-channel-time synchronization detection of the present invention;

[0080] Figure 8 A schematic diagram of current flow during multi-channel-time synchronization detection of the present invention;

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

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

[0083] Fig.11 The figure is a flow chart of the method for detecting the electrical signal and time synchronization of the traveling wave ranging equipment of the present invention. DETAILED DESCRIPTION

[0084] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0085] This solution can automatically detect three items of the device under test, namely current accuracy, time characteristics of the waveform, and time synchronization between different devices. The following will introduce these three items one by one:

[0086] Using a standard signal source as the current input, this solution and the device under test both collect this signal X for comparison.

[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 solution is the true value B. The relative error between A and B is calculated as |((AB) / B)*100%|.

[0088] 2) If Figure 1 As shown, the time characteristic of the waveform, set the trigger condition (I≧5A), when the current amplitude of the signal X reaches the condition, capture the current waveform collected by the device under test and this solution at the same time, calculate the time characteristic parameters of the waveform (rise time, half-wave time, etc.), take the calculated time characteristic parameters of this solution as the true value C, the time characteristic parameters of the device under test as the sampling value D, and calculate the relative error = |((DC) / C)*100%|.

[0089] 3) Time synchronization. Set the trigger condition (such as I≧5A). When the current amplitude of signal X reaches the condition, capture the current waveform collected by the device under test and this solution at the same time. After the capture is successful, the device under test and this solution will upload a time stamp respectively. The time difference between the two time stamps is the time synchronization between different devices. The time stamp uploaded by this solution is taken as the true value E, and the time stamp of the device under test is taken as the sampling value F. Then, the time synchronization between different devices = |FE|. The synchronization waveform is as follows: Figure 2 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, constructing a traveling wave ranging equipment electrical signal and time synchronization detection system, performing a standard traveling wave ranging equipment self-test, and determining whether the standard traveling wave ranging equipment self-test has passed;

[0092] S200, if the device self-test is completed, the detection method is selected through the controllable module;

[0093] S300, after determining the detection method, select the items to be detected;

[0094] S400, performing signal acquisition to obtain a data signal curve graph of the item to be detected;

[0095] S500, judging whether the item to be tested meets the requirements according to the data signal curve of the item to be tested;

[0096] S600: If the item to be tested meets the requirements, determine whether the device needs to continue testing;

[0097] S700, if it is necessary to continue the detection, repeat steps S300-S500, if it is not necessary to continue the detection, encode the detection data and results, alarm information, etc., and upload them to the remote background server via wired or wireless means;

[0098] S800 and the backend server decode and analyze the data, push it to the mobile interactive terminal and cloud platform for display, and draw the current data waveform; at the same time, if an alarm message appears during the detection, it will be notified to the mobile interactive terminal and cloud platform in real time to remind maintenance personnel to handle it.

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

[0100] Build the electrical signal and time synchronization detection system 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 background server, a cloud platform, a mobile interactive terminal, a control unit, a detection device A, a signal input source, and a 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 through a communication bus, the mobile interactive terminal and the cloud platform are connected to the remote background server through a wired / wireless communication bus, the device under test is connected to the detection device, and the remote background server is connected to the control unit.

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

[0104] Specifically including: AD sampling chip, remote signaling circuit and interface, SRAM storage, 4 / 5G module, network port communication module, 232 interface, watchdog circuit, clock circuit, FLASH chip and crystal oscillator circuit; among them, the AD chip module can support voltage and current data input acquisition; 232 interface and network port communication are compatible with most instrument and equipment communication interface methods; the remote signaling circuit and interface can match the interface of the device under test and the standard equipment; there are storage units and MCU for data storage and calculation; with antennas and 4 / 5G modules, wireless communication can be carried out to upload data to the remote background server; with conventional circuits such as watchdog, 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, and the external interface mainly includes a current input channel (input P+ / input P-), one or N current signal acquisition outputs (for collecting data for the device under test), and one or more communication buses for signal transmission;

[0106] The detection device A includes multiple adjustable loads, multiple controllable switch devices, multiple current sensors, standard equipment, AD acquisition module, control module, etc.;

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

[0108] Generally speaking, during normal use, the current signal always starts to enter the detection device A from the 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 marking device, and the AD acquisition module respectively, and communicate with the outside through the communication bus signal to transmit the collected data; after the external device receives the data, it will process and analyze it, and can control the detection device A through the communication bus signal to realize a closed loop.

[0109] The detection system further comprises one or more detection devices A mentioned above, a signal input source, and one or more devices under test;

[0110] Among them, as a current signal input device, it can be controlled by the control module through the communication bus; one or more devices under test (such as traveling wave ranging equipment), as the object of our detection, the number depends on the number of sampling channels in the detection device A, which can be appropriately increased; a control unit, as a control center, can control the online equipment through the communication bus, and can also calculate, process and analyze the data transmitted by the online equipment, and accept the remote signal (such as alarm information) uploaded by the online equipment and transmit it to the remote background server through wired / wireless methods; a remote background server is used to classify and organize the signals uploaded by the control unit, display the waveform, etc., and can push the information to the human-computer interaction interface, such as a mobile interactive terminal, cloud platform, etc., and can accept 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 test data uploaded by the coupling control unit is output as a test data report and saved in the database for review and data backtracking, which is convenient for production or detection and positioning problems;

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

[0114] 3) Self-inspection of detection equipment. When the equipment and system fail, the fault information can be uploaded to the remote background server to notify maintenance personnel to carry out timely repairs, avoid production stoppages, and reduce production costs.

[0115] like Figure 6 The figure shows the current flow direction when the traveling wave ranging equipment electrical signal and time synchronization detection system performs equipment self-test. The specific equipment self-test method is:

[0116] S201, power on the device, enter the power-on self-test program, and click to enter the "self-test" mode;

[0117] S202, the system performs a program reset to detect whether all switches in device A are in a disconnected state and all internal adjustable loads are in an open circuit state;

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

[0119] S204, setting the qualified range of self-test indicators and making it adjustable;

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

[0121] 2. Time characteristic deviation = 10%

[0122] 3. Time synchronization ≤ 100ns.

[0123] The maximum precision range is:

[0124] 1. Current accuracy = 0.5%

[0125] 2. Time characteristic deviation = 5%

[0126] 3. Time synchronization ≤ 100ns.

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

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

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

[0130] Current accuracy = ((current value collected by standard equipment I1-current value collected by AD acquisition module I2) / current value collected by AD acquisition module 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 T1-AD acquisition module time 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 each channel is self-tested;

[0134] S208, disconnect all switches, and set the adjustable load LR1 (or LRn) to an open circuit state; the control unit determines whether the self-test meets the indicators;

[0135] S209, judging the self-test result;

[0136] If the self-test passes, the test method is selected; if the self-test fails, the test will stop, the equipment will be in standby mode, and the device fault alarm will be reported, the time will be set, and it will wait for processing; after the timeout, the fault and data will be uploaded to the remote background server, and then sent to the cloud platform and human-computer interaction terminal by the background server to promptly remind maintenance personnel to check and repair.

[0137] S300, after determining the detection method, select the item to be detected and determine the working mode;

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

[0139] The items to be tested specifically include: time synchronization, time characteristics;

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

[0141] The electrical signal of the device under test and the standard device is read through the electrical signal of the traveling wave ranging device and the time synchronization detection system. The current accuracy of the electrical signal of the device under test is used to determine whether its current signal is current-balanced.

[0142] S400, performing signal acquisition to obtain a data signal curve graph of the item to be detected;

[0143] S500, judging whether the item to be tested meets the requirements according to the data signal curve of the item to be tested;

[0144] Step S400 and step S500 are described below through two working modes;

[0145] like Figure 7 Fig. 9 As shown, it is a schematic diagram of the current flow in the single-channel working mode. The single-channel-time synchronization detection method is:

[0146] S401, the control module closes KC1, KC2, K1...Kn, and reads the electrical signal of the traveling wave ranging device under test;

[0147] S402, judging whether the electric signal of the traveling wave ranging device under test has a current balance according to the current accuracy of the electric signal of the traveling wave ranging device under test;

[0148] S402, if the electric signal is current-balanced, select to keep a single channel n closed (e.g., n=1); set the corresponding adjustable load LRn to 0 ohm; control the signal input source and the adjustable load R1 to input voltage and resistance respectively, and output the required detection current signal in the loop;

[0149] S404, setting the clock of the device under test and the standard device to be synchronized with GPS or Beidou through the control unit;

[0150] S405, enter the signal acquisition trigger mode: set the same trigger condition (such as current ≥ 5A) for the device under test and the standard device, control the signal input source to start output, the device under test and the standard device trigger acquisition synchronously, and report the telesignal with time stamp to the control unit respectively, and the control unit starts to calculate the time difference of the telesignal time stamps of the two;

[0151] S406. The control unit will set a time synchronization judgment standard (such as the standard is: time synchronization is less than 100ns). According to the calculation formula of time synchronization = (standard device time mark T1-test device time mark 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, then report the unqualified mark, wait for processing within the set time, upload the data after the timeout, and enter the next link; if the requirements are met, this test is completed, then you can directly enter the next link;

[0153] like Figure 8 Fig.10 The figure shows the current flow diagram of working mode 2. The working mode 3, multi-channel-current accuracy + time synchronization detection method is:

[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, judging whether the electric signal of the traveling wave ranging device under test has a current balance according to the current accuracy of the electric signal of the traveling wave ranging device under test;

[0156] S413. If the electrical signal is not current-balanced, keep the controllable switch devices KC1, KC2, K1...Kn closed; set the corresponding adjustable load LRn to 0 ohm; control the signal input source and the adjustable load R1 to input voltage and resistance 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, entering the signal acquisition trigger mode: after setting the same trigger conditions for the device under test and the AD acquisition module, the signal input source is controlled to start output, and the device under test and the AD acquisition module synchronously trigger the acquisition signal and upload it to the control unit;

[0159] The control unit calculates data:

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

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

[0162] S416, the control unit will set the current accuracy and waveform time characteristics (such as 10%) judgment standard, and the time synchronization of each channel will be judged together to determine whether it meets the requirements;

[0163] If the requirements are not met, the unqualified mark will be reported, and the system will wait for processing within the set time. After the timeout, the fault and data will be uploaded and the system will proceed to the next stage. If the requirements are met and the test is completed, the system will proceed to the next stage.

[0164] S600: If the item to be tested meets the requirements, determine whether the device needs to continue testing;

[0165] Determine whether the equipment needs to continue testing. This happens when retesting the same sample or testing other items. If you choose to continue testing, the system will re-flow from the test item selection and continue testing; if you do not continue testing, go to the next step.

[0166] Determine whether the test sample needs to be replaced. This usually occurs when batch testing multiple samples. If you choose to replace the sample for testing, the system will re-circulate from the test method selection point and perform the test; if you do not continue the test, proceed to the next step.

[0167] S700, if it is necessary to continue the detection, repeat steps S300-S500, if it is not necessary to continue the detection, encode the detection data and results, alarm information, etc., and upload them to the remote background server via wired or wireless means;

[0168] The control unit encodes the detection data, results, alarm information, etc., and uploads them to the remote background server via wired or wireless means. The background server then decodes the data, organizes and analyzes it, pushes it to the mobile interactive terminal and cloud platform for display, and draws the current data waveform. At the same time, if an alarm message appears during the detection, it will be notified to the mobile interactive terminal and cloud platform in real time to remind maintenance personnel to handle it.

[0169] S800 and the backend server decode and analyze the data, push it to the mobile interactive terminal and cloud platform for display, and draw the current data waveform; at the same time, if an alarm message appears during the detection, it will be notified to the mobile interactive terminal and cloud platform in real time to remind maintenance personnel to handle it.

[0170] The backend server collects test data, draws 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 equipment and determine the life cycle of the tested traveling wave ranging equipment. The output data is used 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 in 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 in 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 in the decay period; the performance decays severely, cannot be continuously used, is considered a defective product, and 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 - detection function and can promptly push alarm information to relevant personnel for timely maintenance when a fault occurs; it has a good human - machine 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 - mentioned method.

[0181] In another embodiment provided by the present application, there is also provided a computer program product containing instructions. When it runs on a computer, it enables the computer to execute any one of the methods for detecting the electrical signal and time synchronization of a traveling wave ranging device in the above - mentioned embodiments.

[0182] It can be understood that the system, device, and storage medium provided by the embodiments of the present invention correspond to the method provided by the embodiments of the present invention. The explanations, examples, and beneficial effects of related content can refer to the corresponding parts in the above - mentioned method.

[0183] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part 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, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive Solid State Disk (SSD)), etc.

[0184] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0185] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0186] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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: Methods include: The current signal of the traveling wave ranging device to be tested is read through the detection system, and whether the current signal is current-balanced is determined based on whether the current accuracy is qualified. If the current signal is current-balanced, a single channel is selected to perform time synchronization detection of the signal; If the current signal is not evenly distributed, select multiple channels to adjust the signal. After the adjustment meets the standard, perform time synchronization detection on the signal.

2. The method for detecting the electrical signal and time synchronization of the traveling wave ranging equipment according to claim 1, characterized in that: The method for judging whether the current accuracy is qualified includes: Current accuracy = ((current value collected by the device I1-current value collected by the AD acquisition module I2) / current value collected by the AD acquisition module I2))*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 the traveling wave ranging equipment according to claim 1, characterized in that: The method for multi-channel signal adjustment is: The detection system sets the adjustable loads LR1, LR2...LRn to 0 ohms, observes the change in the current value of the electrical signal, and fine-tunes the adjustable loads LR1, LR2...LRn to achieve current sharing of the electrical signals between channels.

4. The method for detecting the electrical signal and time synchronization of the traveling wave ranging equipment according to claim 1, characterized in that: If the current signal is not evenly distributed, select multiple channels to perform the signal time walking test method: S411, the control module closes KC1, KC2, K1...Kn to read the electrical signal of the traveling wave ranging device under test; S412, judging whether the electric signal of the traveling wave ranging device under test has a current balance according to the current accuracy of the electric signal of the traveling wave ranging device under test; S413. If the electrical signal is not current-balanced, keep the controllable switch devices KC1, KC2, K1...Kn closed; set the corresponding adjustable load LRn to 0 ohm; control the signal input source and the adjustable load R1 to input voltage and resistance respectively to output the required detection current signal. S414, the control unit sets the clock synchronization of the device under test and the AD acquisition module to be consistent with GPS or Beidou; S415, entering the signal acquisition trigger mode: after setting the same trigger conditions for the device under test and the AD acquisition module, the signal input source is controlled to start output, and the device under test and the AD acquisition module synchronously trigger the acquisition signal and upload it to the control unit; The control unit calculates data: 1) Current accuracy = ((current collected by the device under test I3-current collected by the AD module I2) / current collected by the AD module I2))*100% 2) Waveform time characteristics = ((Time characteristics of the device under test Tr3-AD acquisition module time characteristics Tr2) / AD acquisition module time characteristics Tr2))*100% S416. The control unit will set the judgment standards for current accuracy and waveform time characteristics, and the time synchronization of each channel will be judged together to determine whether it meets the requirements.

5. The method for detecting the electrical signal and time synchronization of the traveling wave ranging equipment according to claim 1, characterized in that: If the current signal is current-balanced and a single channel is selected for signal time walking test, the method is: S401, the control module closes KC1, KC2, K1...Kn, and reads the electrical signal of the traveling wave ranging device under test; S402, judging whether the electric signal of the traveling wave ranging device under test has a current balance according to the current accuracy of the electric signal of the traveling wave ranging device under test; S402, if the electrical signals are current-balanced, select and keep a single channel n closed; The corresponding adjustable load LRn is also set to 0 ohms; the control signal input source and the adjustable load R1 input voltage and resistance respectively, and the required detection current signal is output in the loop; S404. Set the clock synchronization of the device under test and the standard device through the control unit to be consistent with GPS or Beidou. S405. Enter the signal acquisition trigger mode: Set the same trigger conditions for the device under test and the standard device, control the signal input source to start outputting, the device under test and the standard device trigger the acquisition synchronously, and report the tele-signals with time stamps to the control unit respectively. The control unit starts to calculate the time difference between the time stamps of the two tele-signals. S406. A judgment criterion for time synchronization will be set in the control unit. The criterion is: The time synchronization is less than 100 ns. According to the calculation formula of time synchronization = (time stamp T1 of the standard device - time stamp T3 of the device under test), calculate the time difference and judge whether the time synchronization meets the requirements.

6. The method for detecting the electrical signal and time synchronization of the traveling wave ranging equipment according to claim 1, characterized in that: It also 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: 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. 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 output data for evaluation and analysis. The method for judging the performance status of the traveling wave distance measuring device is as follows: Adopt the current amplitude accuracy of the current waveform: X ≤ 0.5%. Rise time: T1 ≤ 5%. Fall time: T2 ≤ 5%. Specifically, the method for judging the performance status of the sample is as follows: When X ≤ 0.5%, T1 ≤ 5%, and T2 ≤ 5%, it is in 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 in 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 in the decay period; the performance decays severely, cannot be continuously used, and the traveling wave distance measuring device under test is a non-conforming product and should be immediately eliminated. 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.

7. The method for detecting the electrical signal and time synchronization of the traveling wave ranging equipment according to claim 1, characterized in that: It also includes the self-check 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: S201. Power on the device, enter the power-on self-check program, and click to enter the "self-check" mode. S202. The system performs a program reset, and checks whether all the switches in detection device A are in the off state and whether the internal adjustable loads are all in the open state. S203. The control module controls the closing of the controllable switches KC1 and KC2, and sets the adjustable load R1 to the fixed resistance state. S204. Set the qualified range of the self-check index. S205. The control module controls the separate closing of K1, sets the adjustable load LR1 to 0 Ω, controls the signal input source to output the self-check voltage, and a current for self-check will be generated in the main circuit and flow through the acquisition CTT1 and CTT2. At this time, trigger the standard device and the AD acquisition module to synchronously acquire this current signal. S206, the standard equipment and the AD acquisition module upload the collected data to the control unit for data calculation: The specific calculation method is: Current accuracy = ((current value collected by standard equipment I1-current value collected by AD acquisition module I2) / current value collected by AD acquisition module I2))*100% Time characteristic = ((standard equipment time characteristic Tr1-AD acquisition module time characteristic Tr2) / AD acquisition module time characteristic Tr2))*100% Time synchronization = (standard equipment time T1-AD acquisition module time T2) 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 each channel is self-tested; S208, disconnect all switches, and set the adjustable load LR1 to an open circuit state; the control unit determines whether the self-test meets the indicators; S209: Determine the self-test result.

8. A traveling wave ranging device electrical signal and time synchronization detection system, used to implement the traveling wave ranging device electrical signal and time synchronization detection method according to any one of claims 1 to 7, characterized in that: The traveling wave ranging equipment electrical signal and time synchronization detection system comprises: a remote background server, a cloud platform, a mobile interactive terminal, a control unit, a detection device, a signal input source, and a device under test; 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 through a communication bus, the mobile interactive terminal and the cloud platform are connected to the remote background server through a wired / wireless communication bus, the device under test is connected to the detection device, and the remote background server is connected to the control unit.

9. The traveling wave ranging equipment electrical signal and time synchronization detection system according to claim 8, characterized in that: The detection device includes multiple adjustable loads, multiple controllable switch devices, multiple current sensors, standard equipment, AD acquisition module, and control module; Among them, one end of the controllable switch device K1, K2, K3...Kn is connected to the corresponding current sensor CT1, CT2, CT3...CTn, and the other end is connected to the controllable switch device KC1, which is used as a switch and controlled by the control module; The current sensors CT1, CT2, CT3...CTn are connected to the corresponding adjustable loads LR1, LR2, LR3...LRn, and are used to detect the detection current in each branch circuit, and transmit the signal to the outside of the device after acquisition; the current sensor CTT1 is connected to the standard equipment, and the current sensor CTT2 is connected to the AD acquisition module, and are used to detect the current in the main road, and transmit the signal to the standard equipment and the AD acquisition module after acquisition; The other end of the adjustable loads LR1, LR2, LR3…LRn is connected to the current sensor CTT1, which is used to control 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 switch device KC2, which is used to adjust the current in the main circuit; The control module is connected to the controllable switch devices KC1, KC2, K1, K2, K3...Kn through control lines, and is used to control the controllable switch devices; The AD acquisition module converts the analog signal into a digital signal and transmits the output in real time through the bus.

10. 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 according to any one of claims 1 to 7.

Images