RU153775U1 - CABLE LINES DIAGNOSTIC DEVICE - Google Patents

Abstract

A cable line diagnostics device including a pulse generator, a measurement unit, a memory unit, a diagnostic results unit, characterized in that the device further includes a data acquisition unit, a communication unit, a common bus, a calibration unit, a digital processing unit, a reporting unit, an automated workstation (AWP), moreover, the data acquisition unit with two-way communications is connected to the communication unit and the pulse generator, the data acquisition unit is connected with one-way communication with a common bus, the communication unit is connected with two-way communication with a calibration unit and with a measurement unit, the one-way communication measurement unit is connected to the workstation, the common bus is connected by two-way communication to the memory unit, digital processing unit, report generation unit, the memory unit is connected by two-way communication to the workstation, the workstation is connected to the diagnostic result unit by one-way communication.

Description

The cable line diagnostic device is designed to determine the residual life of the cable line (CL) by the indicator of the coefficient of reliability, and to take further measures depending on the state of insulation when testing cable lines.

The utility model is a software and hardware complex, including an automated workstation (AWS), designed to diagnose a cable line without destroying the insulation state and refers to expert devices that determine the residual cable life by the reliability factor and taking further measures depending on the insulation state at test of CR.

There are known systems that could be used to solve a similar problem provided that they are substantially modified and adapted to the specifics of cable line diagnostics. As a prototype of the selected "Device diagnostic cables" (RF patent for the invention No. 2418302). A device that is close inherently to the proposed utility model and contains modules and blocks close in their functional purpose is intended for cable diagnostics. However, this device diagnoses the cable by comparing the value of the leakage resistance with the data of the storage device by the magnitude of the reference voltage.

In the proposed utility model, in contrast to the prototype, the defectiveness of the product is investigated on the basis of the analysis of test data by two different methods - the dielectric loss tangent method and the partial discharge method. And if the results of both methods coincide, a decision is made on the suitability of the cable line for further operation.

The technical result consists in the fact that by calculating with a high degree of certainty, the reliability indicator of the cable line is calculated and the time to the next test is determined.

The task is achieved in that the cable line diagnostic device, including a pulse generator, a measurement unit, a memory unit, a diagnostic results unit, according to a utility model, further includes a data acquisition unit, a communication unit, a common bus, a calibration unit, a digital processing unit, a reporting unit an automated workstation (AWP), wherein the data acquisition unit is connected by two-way communications with the communication unit and the pulse generator, the data acquisition unit is connected by one-way communication with a common bus, the communication unit bilaterally connected to the calibration unit and to the measurement unit * the measurement unit is connected one-way to the workstation, the common bus is connected to the memory unit, the digital processing unit, the reporting unit, the memory unit is connected to the workstation, the workstation is connected to the unit diagnostic results.

This problem is solved by automating the analysis and processing of diagnostic data in order to present it in a form convenient for conducting analytical work to determine the residual CL resource.

The structure of the utility model is presented in figure 1 and consists of the following blocks:

1. Data acquisition unit.

2. Communication unit.

3. Calibration unit.

4. The pulse generator.

5. Measurement unit.

6. Common bus.

7. The block of memory.

8. The digital processing unit.

9. Reporting unit.

10. AWP.

11. Block diagnostic results.

The data collection unit (1) is intended for collecting test data and their further transmission to the system for analysis by two different methods.

The communication unit (2) is used to transfer data between the calibration unit (3) and the test object through the data collection unit (1), as well as transmitting the received data to the measurement unit (5). In the Communication Unit (2), the high-frequency signals of partial discharges are converted for further processing by the Measurement Unit (5).

Calibration block (3) - designed to calibrate two parameters:

- charge (in pc) - to obtain the true value of the charge level;

- cable length (or the propagation velocity of partial discharge pulses) - for accurate identification of places with poor insulation.

A pulse generator (4) through a data acquisition unit (1) is supplied to the test cable line a rectangular pulse (meander) with a certain frequency.

The measurement unit (5) captures the partial discharge signals received from the Communication unit (2) and evaluates them. Designed to determine the location of the source of partial discharges - a cable section with a defect, a defect in the connection sleeve or in the termination. The defect location is detected by the difference in the arrival time of the reflected pulses, also depending on the charge level. Knowing the length of the cable line, the propagation velocity of the partial discharge pulses, which were obtained by calibration for this particular cable, and the time of arrival of the pulses, the place of its defect is determined.

Data processing module - prepares the necessary information for further analysis in the workstation (10), outputting information to a display or in printed form, as well as the ability to transfer results to a portable storage medium.

Common bus (6) - is a common cable through which the blocks are connected - a memory block (7), a digital processing block (8), a reporting unit (9).

The memory block (7) is intended for storing the results of CL diagnostics, as well as communication with the workstation (10).

Digital processing unit (8) - is intended for processing the results of diagnostics of the dielectric loss tangent in a form convenient for further analysis. The value (by 8 measurements) of the dielectric loss angle is measured. The obtained data on the dielectric loss tangent are transmitted to the workstation for subsequent analysis.

In the reporting unit (9), the diagnostic data is prepared in a graphical and paper form convenient for analysis.

AWP (10) - is designed to control the test setup, enter the parameters of the test cable, perform calculations by the method, with the possibility of determining the remaining life of the cable and the preparation of a technical report. The workstation (10) has software for measuring the loss tangent and partial discharges with determining the location of the source, and analyzing the data obtained.

The block of diagnostic results (11) is a technical report indicating the date of the next diagnosis, a decision on the further operation of the cable, depending on the presence of a defect, a graphic image of the location of the defect and the corresponding level of partial discharges.

The essence of the proposed utility model consists in processing the test data by two different methods - the dielectric loss tangent method and the partial discharge method. CL is disconnected from 2 sides, all phases of the Far side are isolated, two phases of the near end are grounded, and the third phase is connected to the installation of high-voltage tests. From this end of the cable, measurements are taken to determine the insulation resistance of the cable, cable length, dielectric loss tangent, and partial discharge level.

The pulse generator (4) through the data acquisition unit (1) delivers a rectangular pulse (meander) with a certain frequency to the tested CL. This pulse, passing through the test section of the cable, is reflected from the location of the cable sleeves, insulation defects, as well as the opposite end of the cable. In the Data Collection Unit (1), data are generated on the time of arrival of the pulse reflected from these sections of the CR, as well as the level of partial discharges at these points. Pulses are recorded by the measurement unit (5). Then, the data through the data acquisition unit (1) enters the data processing module, where the dielectric loss tangent is determined in the digital processing unit (8) and the failure-free operation coefficient is calculated from the dielectric loss tangent in the workstation (10). At the same time, the test data are sent to the measurement unit (5), where the data on partial discharge measurements in the cable line are calculated, and the failure-free operation coefficient for partial discharges is determined in the AWP (10). Further, these two coefficients are compared. And if they coincide, a conclusion is drawn about the correctness of the diagnosis. In the case of a large difference, when comparing these coefficients, repeated measurements are performed.

Claims (1)

A cable line diagnostics device including a pulse generator, a measurement unit, a memory unit, a diagnostic results unit, characterized in that the device further includes a data acquisition unit, a communication unit, a common bus, a calibration unit, a digital processing unit, a reporting unit, an automated workstation (AWP), moreover, the data acquisition unit with two-way communications is connected to the communication unit and the pulse generator, the data acquisition unit is connected with one-way communication with a common bus, the communication unit is connected with two-way communication with a calibration unit and with a measurement unit, the one-way communication measurement unit is connected to the workstation, the common bus is connected by two-way communication to the memory unit, digital processing unit, report generation unit, the memory unit is connected by two-way communication to the workstation, the workstation is connected to the diagnostic result unit by one-way communication.

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