RU187083U1 - Delay line for modeling ice deposits on the wires of overhead power lines and communications - Google Patents

Abstract

The utility model relates to the field of electric power and can be used as a verification device for location devices for detecting ice formations on the wires of overhead power transmission lines and wire communication lines.

The technical result of the utility model is the possibility of using a delay line to simulate icy deposits on the wires of overhead power and communication lines, by modeling additional delays and additional attenuation of electromagnetic signals caused by the appearance of icy formations on the wires of the lines, which is necessary for setting up, checking location devices designed for detecting ice formations on the wires of overhead power lines or a wire communication line.

The technical result is achieved by the fact that the delay line for modeling icy deposits on the wires of overhead power lines and communications, consisting of several T-shaped blocks, where each block has two longitudinally connected links responsible for the inductance in the delay line and the frequency response of losses in the delay line , and a transversely connected capacitance C connected between a common point of two longitudinally connected links and a common wire of the delay line, according to the present utility model, the delay line is additionally can be connected to several units controlled by electric switches, capacitances C1 and an electric circuit, while in the simulation mode with a delay line of ice influence, capacitance C1 is connected in parallel to capacitance C, to the gap, between the common point of two longitudinally connected links and two parallel connected capacitances C and C1, an electrical circuit is connected, which is responsible for the linear capacity of the iced clutch on the wires of the simulated line and for the frequency response of linear losses in the iced clutch.

Description

Technical field

The utility model relates to the field of electric power industry and can be applied for use as a verification device for location-based devices for detecting ice formations on the wires of overhead power transmission lines (transmission lines) and wire communication lines.

State of the art

Known delay lines with lumped parameters (L.A. Meerovich, L.G. Zelichenko, Pulse technology, Soviet radio, Moscow, 1953), consisting of several T-shaped blocks (Fig. 1), each block has two longitudinally connected inductances L / 2 1,2 and transversely connected capacitance C 3 connected between the common point of two longitudinally connected inductors L / 2 and the common wire of the delay line. Such delay lines have a characteristic frequency:

ω _c = 2 / √ (L⋅C).

The characteristic resistances of such links, at the operating frequency ω << ω _c , is equal to:

Z = √ (L / C).

Moreover, the delay time for one link is equal to:

τ = √ (L⋅C).

To obtain a signal delay for a time t = n⋅τ, n blocks are connected in series. At signal frequencies ω less than half the characteristic frequency ω <= (ω _c / 2), the characteristic resistances and delay time for one block of such a delay line with lumped parameters remain close to the values indicated above.

These delay lines simulate power lines without losses, to generate losses in the delay line, the longitudinally connected inductances L / 2 are replaced by a link forming the inductance in the delay line and the frequency response of the losses in the delay line. In the simplest case, the link consists of an L / 2 inductance and an active resistance R connected in series or in parallel.

Such delay lines with lumped parameters are used for tuning, checking the operation of location devices, while the delay line acts as an overhead or cable power line, or a wired communication line.

Recently, location-based devices have been used to detect icy formations on the wires of overhead power lines, or long wire lines. At the same time, such delay lines with lumped parameters can be used to model the propagation of electromagnetic signals through the wires of an overhead or cable power line, or a wireline without ice. The disadvantage of such delay lines is that they do not simulate additional delays and additional attenuation of electromagnetic signals caused by the appearance of ice formations on the wires of power lines.

Utility Model Disclosure

The objective of the utility model is to develop a delay line for modeling icy deposits on the wires of overhead power lines and communications, which eliminated the disadvantages of the prototype.

The technical result of the utility model is the possibility of using a delay line to simulate additional delays and additional attenuation of electromagnetic signals caused by the appearance of ice formations on the power transmission line wires, which is necessary for setting up, checking location devices designed to detect ice formations on the wires of overhead power transmission lines or a wire communication line .

The technical result is achieved by the fact that the delay line for modeling icy deposits on the wires of overhead power and communication lines, consisting of several T-shaped blocks, each block has two longitudinally connected links responsible for the inductance in the delay line and the frequency response of losses in the delay line in simulation mode of the line without ice, and a transversely connected capacitance C connected between the common point of two longitudinally connected links and the common wire of the delay line, according to the present of the utility model, the delay line is supplemented by connectable to several units controlled by electric switches, capacitors C1 and an electric circuit, while in the simulation mode by the delay line of the influence of ice, the capacitance C1 is connected in parallel to the capacitance C, in the gap, between the common point of two longitudinally connected links and two parallel connected capacitances C and C1, an electrical circuit is connected, which is responsible for the linear capacity of the ice-clutch on the wires of the simulated line and for the frequency response ku linear losses in an icy clutch.

Utility Model Implementation

The circuit of the inventive delay line in the simulation mode of the line with icy formations on the line wires is shown in FIG. 2. In FIG. Figure 3 presents a sectional view of a power transmission line with an iced sleeve located above the ground.

The numbers in FIG. 1 and FIG. 2 are indicated:

1,2 - longitudinally connected inductances L / 2;

3 - transversely connected capacity C.

The numbers in FIG. 2 are indicated:

4 - additional capacity C1;

5 - electric circuit, which is responsible for the linear capacity of the iced clutch on the wires of the simulated power lines and for the frequency response of linear losses in the iced clutch.

The numbers in FIG. 3 are indicated:

6 is a cross section of a power line wire;

7 - cylindrical icy clutch on a power line wire;

8 - the surface of the earth.

The delay line for modeling ice deposits on the wires of overhead power lines and communications operates in two modes: 1) modeling power lines without ice (Fig. 1) and 2) modeling power lines with ice formations on the wires of the line (figure 2).

In the first mode of operation, the delay line simulates power lines without ice formations. The operation of the delay line in the first mode is well described in the literature as a delay line with lumped parameters (L.A. Meerovich, L.G. Zelichenko, Pulse technology, Sovetskoe Radio, Moscow, 1953), consisting of n series-connected T-shaped blocks . Each block forms a delay τ, all n blocks form a joint signal delay for a time t = n⋅τ.

Switching between the modes of operation of the delay line with ice modeling is carried out using controlled electrical switches connected to several blocks of the delay line, which, in the simulation mode by the delay line of the influence of ice, parallel to the capacitor C 3, connect an additional capacitor C1 4, and to the gap between the two capacitors C 3 and C1 4 and a common point of two longitudinally connected links, connect an electric circuit 5, which is responsible for the running capacity of the ice-clutch on the wires of the simulated power transmission line and for h frequency characteristic of linear losses in an icy clutch.

In the second mode, the delay line simulates power lines with ice formations on the wires of power lines and works as follows. The ice-clutch 7 on the wires 6 of the power transmission line (Fig. 3) forms a cylindrical dielectric with a dielectric constant of the order of ε ~ 4 and a nonzero dielectric loss tangent tanδ> 0. In this case, the electric capacitance of wire 6 relative to earth 8 increases (due to ε ~ 4), becomes larger than the capacitance C 3 of wire 6 relative to earth in the absence of ice clutch 7, and additional losses appear due to the nonzero dielectric loss tangent tanδ> 0.

The electrical capacitance of the wire 6 relative to the ground 8 in the presence of an ice clutch 7 can be represented in the form of two series-connected capacities: 1) a cylindrical capacity of the ice clutch formed by the surface of the wire 6 and the outer surface of the ice clutch 7, and 2) the capacity of the outer surface of the ice clutch 7 relative to the surface lands 8. Consider both components.

1. The cylindrical capacity of the ice sleeves in the delay line with ice simulation is an electric circuit 5, which is responsible for the linear capacity of the ice sleeves on the wires of the simulated line and for the frequency response of linear losses in the ice sleeves. In the simplest case, the electric circuit 5 consists of an electric capacitance and a series or parallel connected active resistance, responsible for losses in the ice clutch 7, and, consequently, additional losses in the delay line caused by the presence of the ice clutch 7. To form a complex frequency characteristic of the losses in ice clutch 7, the electrical circuit 5 may consist of several passive elements R, C and L.

2. The capacity of the outer surface of the ice clutch 7 relative to the surface of the earth 8 in the delay line with simulation of ice is two parallel connected tanks C 3 and C1 4. These capacities, together with the electric circuit 5, are responsible for additional delays in the delay line caused by the presence of ice couplings 7.

Thus, the delay line for modeling ice deposits on the wires of overhead power and communication lines allows you to simulate additional delays and additional attenuation of electromagnetic signals during transmission through power lines, caused by the appearance of ice formations on the wires, which allows you to use this delay line to configure, verify location devices designed to detect icy formations on the wires of overhead power lines, or a wire line communication.

Claims (1)

The delay line for modeling ice deposits on the wires of overhead power and communication lines, consisting of several T-shaped blocks, each block has two longitudinally connected links responsible for the inductance in the delay line and the frequency response of losses in the delay line in the mode of modeling the line without ice, and a transversely connected capacitance C connected between a common point of two longitudinally connected links and a common wire of the delay line, characterized in that the delay line is supplemented by to several units controlled by electric switches, capacitances C1 and an electric circuit, while in the simulation mode with a line of delay of the influence of ice, the capacitance C1 is parallel connected to the capacitance C, in the gap between the common point of two longitudinally connected links and two parallel connected capacitances C and C1, an electrical circuit is connected, which is responsible for the linear capacity of the iced clutch on the wires of the simulated line and for the frequency response of linear losses in the iced clutch.

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