RU238930U1 - RECEIVING DEVICE FOR CONTACTLESS LOCATION OF DAMAGE TO OVERHEAD POWER LINES - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to the electric power industry, and can be used for contactless remote fault location in branched overhead power lines. The receiving device comprises two orthogonally directional loop antennas 1, a preliminary filtering and amplification means 2, an analog-to-digital converter 3, a computing terminal 4, a power source 5, a signal processing means 6, a synchronization means 7, a data transmission means 8, a power line support 9, a phase conductor 10, and a fault location of the power line 11. The receiving device operates as follows. When power transmission line 12 is operational, the electromagnetic background in the monitored area is stable and monitored by the software of computing terminal 4. After an accident, an elevated and short-term emergency electromagnetic spectrum is emitted at fault location 11, which hits directional loop antennas 1. The analog electrical signal is then fed to a two-channel pre-filtering and amplification unit 2. The processed fault signal, along with the synchronization signal from the universal time system, is fed to the inputs of analog-to-digital converter 3. Two channels of the processed signal from the antenna, and the third channel, the synchronization signal, are then converted to digital form. Software algorithms in computing terminal 4 analyze the frequency range of 1-25 kHz and identify the fault. Determining the direction of the fault signal source is based on the Fourier transform method, which includes representing the incoming signal in the frequency domain and calculating the phase shifts between the signals received by each antenna. The resulting information from computing terminal 4 is transmitted to the data transmission facility and then relayed via a communication channel to visualize the fault location on the electrical network diagram. Signal 7 of the synchronization facility, received from the universal time system, is connected to the third channel of analog-to-digital converter 3 and is necessary for synchronizing the electromagnetic spectrum of the fault received by the antennas with other receiving devices during their combined operation. This enables fault location determination using synchronous multi-point radio direction finding. The technical result of the receiving device is the ability to simultaneously monitor a large number of complex overhead power lines in a given area, accurately identifying the location of line faults, and enabling the development of a scalable overhead power line fault monitoring system based on this signal. Fig. 1.

Description

The utility model relates to electrical engineering, in particular to the electric power industry, and can be used for contactless remote detection of fault locations in branched overhead power lines.

The closest to the claimed technical solution, adopted as a prototype, is a device for diagnosing single-phase ground faults (RU Patent No. 160906, "Device for diagnosing single-phase ground faults on overhead lines in distribution electric networks with an isolated neutral operating mode with a voltage of 6-10-35 kV", class G01R 31/08 (2006.01), published on 10.04.2016), containing a series-connected means for removing primary information (antenna), a signal processing means consisting of an analog-to-digital converter (ADC), a fast Fourier transform converter and an identifier of higher harmonic components, an information processing means and an information transmission means, contains an interface connected to a modem for transmitting data for remotely sending the collected information to the operator of the power supply system.

A disadvantage of this technical solution is its limited functionality, which is reflected in the inability to simultaneously monitor multiple overhead power lines. This is due to the use of a capacitive antenna, which requires proximity to the monitored conductor and requires the installation of prototype devices on each line, reducing monitoring efficiency. This increases the economic and labor costs of equipping highly branched networks and complicates the maintenance and operation of the prototype device. Another drawback of the known prototype device is the inability to accurately locate faults in overhead power lines, which complicates timely fault detection and repairs, reducing the reliability and safety of the electrical network.

The objective of the claimed utility model is to expand the functionality of the prototype to ensure effective monitoring of overhead power lines with the ability to accurately determine fault locations, while reducing capital investment and labor costs for installation and equipment maintenance.

The technical result of the proposed receiving device is to enable the simultaneous monitoring of a large number of overhead power lines of complex structure in a given area with precise detection of the location of line faults, with the possibility of constructing a scalable overhead power line fault monitoring system based on it.

The stated task is achieved in that the receiving device for contactless determination of the location of damage to overhead power lines contains a series-connected receiving antenna, a signal processing means and an information transmission means, characterized in that the receiving antenna is made in the form of two identical orthogonally directional broadband loop antennas, the signals from which are fed to a two-channel preliminary filtering and amplification means, the signal processing means contains a series-connected three-channel analog-to-digital converter and a signal processing computing terminal, the information from which is fed to the information transmission means, wherein the third channel of the analog-to-digital converter is used to convert the signal from the synchronization means, coming from the unified time provision system, in turn, the ADC is connected to the computing terminal.

The essence of the utility model is explained by the drawing, where

Fig. 1 shows a general view of a receiving device for contactless detection of damage locations on overhead power lines.

The receiving device contains

1 - two orthogonally directional loop antennas;

2 - preliminary filtration and amplification means;

3 - analog-to-digital converter;

4 - computing terminal;

5 - power source;

6 - signal processing means;

7 - synchronization tool;

8 - means of transmitting information;

9 - power transmission line support;

10 - phase conductor;

11 - location of damage to the power line.

The receiving device operates as follows. When power transmission line 12 is operational, the electromagnetic background in the monitored area is stable and monitored by the software of computing terminal 4. After an accident, an elevated and short-term emergency electromagnetic spectrum is emitted at fault location 11. This is received by directional loop antennas 1. The analog electrical signal is then fed to a two-channel pre-filtering and amplification unit 2. The processed fault signal, along with the synchronization signal from the universal time system, is fed to the inputs of analog-to-digital converter 3. Two channels of this converter receive the processed signal from the antenna, and the third channel receives the synchronization signal. These channels are then converted to digital form. In computing terminal 4, software algorithms analyze the frequency range of 1-25 kHz and identify the fault.

Determining the direction of the source of a fault signal is based on the Fourier transform method, which involves representing the incoming signal in the frequency domain and calculating the phase shifts between the signals received by each antenna.

The resulting information from the computing terminal 4 is transmitted to the information transmission facility and then transmitted via a communication channel to visualize the location of the fault on the electrical network diagram.

Signal 7 of the synchronization device, received from the universal time system, is connected to the third channel of the analog-to-digital converter 3 and is necessary for synchronizing the electromagnetic spectrum of the fault, received by the antennas, with other receiving devices during their combined operation. This enables fault location determination using synchronous multi-point radio direction finding.

Claims (1)

A receiving device for contactless detection of the location of damage to overhead power lines, comprising a series-connected receiving antenna, a signal processing means and an information transmission means, characterized in that the receiving antenna is made in the form of two identical orthogonally directional broadband loop antennas, the signals from which are fed to a two-channel preliminary filtering and amplification means, the signal processing means contains a series-connected three-channel analog-to-digital converter and a signal processing computing terminal, the information from which is fed to the information transmission means, wherein one of the channels of the analog-to-digital converter is used to convert the signal from the synchronization means, coming from the unified time provision system, in turn, the ADC is connected to the computing terminal.