RU126473U1 - DEVICE FOR REMOTE CONTROL OF THE STATE OF THE ELECTRIC TRANSMISSION LINE - Google Patents

Abstract

The utility model relates to monitoring and determining the location of damage to power lines and can be used at electrical substations for remote monitoring of the state of overhead or cable power lines.

The technical result of the utility model is to increase the information content, reliability of control and accuracy of determining the location of damage in various operating conditions, including the disconnected line mode.

The device comprises a programmable block (1) for forming and digital processing, equipped with an operator panel (2), analog-to-digital (3) and digital-to-analog (4) converters, and a block (5) for interfacing with a power line. Block (5) is connected by a control channel (6) to block (1) and is connected to the input and output of converters (3) and (4), respectively. Block (1) is made with the possibility of forming broadband signals at the output of the converter (4), receiving reflected radiation, forming its trace, calculating the differential values of wave impedance along the power line from the generated trace, comparing these values with the corresponding values calculated earlier, and determining locations and the nature of changes in the state of the power line based on the results of this comparison.

Block (1) is equipped with a communication port (7) with a digital network and / or interface (8) for communication with relay protection and automation equipment. A unit of signals of a single time from a satellite system for global positioning equipped with an antenna 10 is connected to block (1). Block (5) is made with the possibility of alternating connection of wires and cables of a controlled transmission line. 3 C.p.F., 1 ill.

Description

Technical field

The utility model relates to monitoring and determination of places of damage to power lines and can be applied at electrical substations for remote monitoring of the state of overhead and cable power lines.

State of the art

It is known that a device for remote monitoring the status of a power line, selected as a prototype, contains a computing unit in the form of a microcomputer, to which a probe pulse generator, a reflected signal receiver, and a line wire switch are connected [patent RU 2400765 of December 18, 2008].

The prototype device is made with the possibility of forming reflectograms of reflected signals and determining the location of damage according to the analysis of reflectograms.

At the same time, the prototype device generates frequency-modulated sounding pulses in a line, and the place of damage is determined directly from reflectograms of the reflected signal.

The disadvantage of the prototype is the low information content and reliability of the control, the dependence of the determined location of damage on the operating conditions of the line at the time of its sounding.

Utility Model Essence

The technical result of the utility model is to increase the information content, reliability of control and accuracy of determining the location of damage in various operating conditions, including the disconnected line mode.

The subject of a utility model is a device for remote monitoring of the state of a power line, containing a programmable block for generating and digital signal processing, equipped with an operator panel, analog-to-digital and digital-to-analog converters, and a block for interfacing with a power line, wherein the coupler is connected by a control channel to the programmable block and connected to the input of analog-to-digital and the output of digital-to-analog converters, and the programmable unit is configured to of broadband signals at the output of the digital-to-analog converter, receiving reflected radiation, generating its trace, calculating the differential values of wave impedance along the power line using the generated trace, comparing these values with the corresponding values calculated earlier, and determining the places and nature of changes in the state of the power line according to the results of the indicated comparisons.

Unlike the prototype, the proposed device generates not frequency-modulated, but broadband pulses into the power line, and from the reflectogram of the reflected signal, it first determines the distribution along the line of its differential wave impedance values and compares this distribution with the same distribution for the undamaged line, and then according to the received differential distribution differential wave impedance determines the presence, location and nature of damage on the power line.

The utility model has developments related to particular cases of its implementation and consisting in the fact that:

- the programmable block for generating and digital signal processing is equipped with a port for communication with a digital network and / or interface for communication with relay protection and automation equipment;

- a receiver of signals of uniform time from a satellite system of global positioning is connected to a programmable block for the formation and digital processing of signals;

- the interface unit with the power line is configured to connect wires and cables of at least one monitored power line.

Implementation of a utility model, taking into account its developments

The block diagram of the device is shown in figure 1. The diagram shows:

- a programmable unit 1 for generating and digital signal processing, equipped with a remote control 2 of the operator, analog-to-digital converter 3 and digital-to-analog converter 4;

- block 5 interface with the power line;

- control channel 6;

- port 7 for communication with a digital network;

- interface 8 for communication with the relay protection and automation system (RPA);

- a receiver 9 of signals of a single time from a satellite system of global positioning, equipped with an antenna 10;

Block 5 is connected by channel 6 to block 1 and is connected to the input of the converter 3 and the output of the converter 4. The receiver 9 is connected to block 1. The console 2 may have a display and a keyboard.

Block 5 is configured to alternately connect controlled wires and cables of at least one overhead or cable power line.

The device operates as follows.

Block 1 operates under the influence of control commands that can come from the operator from the console 2, from a digital network through port 7 or from relay protection equipment through interface 8.

Upon receipt of the control command, block 1 through channel 6 acts on block 5, which provides the connection of the corresponding wire or cable of the monitored line and interface with it. In this case, block 5 under the control of block 1 sets the required transmission coefficients of the received signal from the controlled line to the input of the converter 3 and the sent signal from the output of the converter 4 to the controlled line. The pairing carried out by block 5 also includes the separation of these signals, for example, using a directional splitter.

Then block 1 using the Converter 4 generates a modulated broadband signal, which is converted by block 5 into a broadband pulse probing the monitored line.

Broadband high-frequency radiation reflected by the inhomogeneities of the monitored line is received by unit 1 using a converter 3. The moments of receipt of commands from the console 2, from external devices through port 7 and interface 8, the times of sending a probe pulse to the line and the arrival of the corresponding elements of the reflected radiation are recorded on a time scale generated by block 1. Temporary synchronization of processes when working with external devices is provided using signals of a single time received in block 1 from Manika 9.

Block 1, using the information stored in its memory on the propagation speed of broadband pulses along the controlled line, forms a reflectogram of the received reflected radiation, which calculates the distribution of the differential wave impedance values along the controlled line. Comparing this distribution with a similar distribution obtained earlier and stored in memory, block 1 forms a difference distribution characterizing the presence and place of changes in the differential resistance along the line. These changes reflect changes in the state of the power line in the time interval between the control packets of the probe pulses.

A detailed analysis of the nature of the changes in the differential wave resistance, carried out, for example, by the operator of the console 2, allows you to highlight the changes in the differential wave resistance caused by non-hazardous natural processes on the line, changes caused by phenomena that threaten damage to the line, and changes caused by damage to the line.

Claims (4)

1. A device for remote monitoring of the state of the power line, containing a programmable block for generating and digital signal processing, equipped with an operator panel, analog-to-digital and digital-to-analog converters, and an interface unit with a power line, wherein the interface unit is connected by a control channel to said programmable unit and connected to the input of analog-to-digital and the output of digital-to-analog converters, and the programmable unit is configured to generate broadband signals to Exit-analog converter, receiving the reflected radiation, the formation of its waveform, calculating the resistance values of differential wave along the transmission line formed on the trace, a comparison of these values with the corresponding values computed previously and determining the sites and nature of the condition transmission line changes according to the results of said comparison. 2. The device according to claim 1, in which the programmable block for generating and digital signal processing is equipped with a port for communication with a digital network and / or interface for communication with relay protection and automation equipment. 3. The device according to claim 2, in which a receiver of signals of a single time from a global positioning satellite system is connected to a programmable block for generating and digital signal processing. 4. The device according to claim 1, in which the interface unit with the power line is configured to alternately connect wires and cables of at least one monitored power line.

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