SU316392A1 - Dc power transmission line - Google Patents

Description

The invention relates to direct current power transmission lines with overhead, cable or mixed (overhead and cable) long-haul lines, for which it is of great importance to preserve some of the greatest possible throughput during repair work.

DC power lines are known with switching to the same-named polkuah substations, as a result of which, when one pole of a line is brought in for repair, the energy transported earlier along this pole is completely or partially transferred along another pole. Isolat qi

The conductor and insulating dimensions of the line allow repairs at one pole while the other poles are turned on. With this method of reserving a line, a lot of electricity is spent on heating the wires when the pole is in: significant (up to double) overcurrent mode.

The proposed transmission line is characterized in that it is provided with switching points arranged along its length, which allow uninterrupted operation during repair of individual sections.

Each switching point contains switching devices, for example, disconnectors, two of which are connected in series to each of the isolated polks, and a jumper with switching devices is connected between the common points of these devices,

Disconnectors or other switching devices installed at the switching points make it possible to disconnect for repair any part of the pole of the line between the switching points and to continue the transmission of electricity in this area to the other pole (or other poles) of the same polarity and the other parts; on all з line lines of the same gender.

Similarly, the sectioning of the line occurs with the pole divided into groups of wires insulated from each other, while the switching points allow you to disconnect a section of the group of wires half a pole, and with the transfer transported on it

section of electricity in other groups of wires, and on other terminals — on all wires of the pole. Additional losses due to heating of wires when a section of a sectioned line is disconnected are smaller in larger sections of a sectioned line. The number of switching points should be determined on the basis of a technical and economic analysis by comparing the cost of additional electric power losses during the transfer of psl sites to emergency and planned repairs and estimated costs for the construction and operation of switch points. On mixed lines, the construction of advanced points is a B the junction of the air sections to the cable sections of the link ;; The number of paired cables may differ from the number of zeroes of a pinch, the design of this item in this case should preserve the specificity of connecting the cable to the dislocation pole.

One op tel flamma of prepa rations o; vj of cutting the line is the possibility of simultaneously performing repair work with two (or more) poles i; a rastersh; the section of the line, Kpovie, in addition (in case of emergency line switching, sectioning contributes to a clearer position, in the Spreadleigh of the place there is a registrar.

FIG. i shows a sectioned double-knit unipolar face; Fig. / 2 section they are rav an on one n opule to as y n i e lini with the separation of the IlpOBonoE poles into two isolates of each other of the group in fig. 3 - sekine1 bipolar line with section 1P) o.- wires of each pole. Luce into two isolated from each other rpjrnnbj; on oyig. 4 sociocirovirus bi-polar lines with two ions filled from each other in positive-polarity and two isolated by negative steps from each other; J in FIG. 5 is an example of the sectioning of a double-chain bilar line.

The bipolar unipolar line of the current supply (FIG. 1) contains a converter at each substation: 1 and 2; (which are connected by their lanes to the working ground (in the diagram of Fig. 1, ground the poles) and the FV pole of the line, On the line; switching points 3 (the diagram shows three switching points), consisting of six disconnectors,

12-17, the second - 18-23 and the third 24-29.

Normally disconnectors 4,12,13,18,

19,24,25 and SB and the disconnectors 5,6Д4,15,20,21,26,27,10 are open and thus both circuits work separately.

In the event of damage to one of the poles of the line, for example, section 30, when converters 2 are closed, disconnectors 13 and 18 are closed, and dispensers 14, 15, 20 and 21 are closed. In this scheme, after unlocking the transducer navy 2, all transmission power is transported along the pole only 31, and on the remaining sections - on both line zeroes,. If this is allowed by the overcurrent conditions of the pole wires in section 31, the showers can transmit the nominal transmit power. With limited overloading capability, the line capacity is reduced accordingly.

The sectioning of the line allows repairs to be performed simultaneously on different sections of the line, for example, to close repair of sections 30 and 32, open the disconnectors 13 and 24 to closed. - disconnectors 14, 15, 26 and 27, and for output to repair sections simultaneously 30 and 33 - open the disconnectors 13,18s23 and 28 and close the disconnectors 14,15,20,21,26 and 27.

In a sectioned single-pole transmission line (Fig. 2), switching points can be made without cross-connectors in cross-connections (in this case, disconnectors in switch points can be repaired only when the gear is off) or according to the scheme; FIG. 1. Unlike a bipolar transmission line in a unipolar interconnect for switching, it is installed (And at the switching points, it is necessary to disconnect the entire line for a short time. I The bipolar power line can be partitioned depending on the power of the number of converters in substations or by the type of single-circuit unipolar transmissions (Fig. 3.) or by the type of transmission double-circuit (Fig. 4).

For parallel lines of the same voltage class, sectioning is possible by creating switching points that combine the same poles of these lines; in fig. 5 shows an example of such a section. Designed for two bipolar lines.

Each line or its subsequent inclusion (commissioning) is connected with the de-energization of one transmission pole for the time required for the production of switching by disconnectors at switching points. To eliminate this drawback, the proposed line provides for installation at the exit from the substation and at switching points or only at the exit from the substation of high-speed switching devices such as disconnectors and short-circuit connectors with protection and automation devices, which are coordinated with the corresponding substation protection devices such that shutdowns or subsequent switching on of the switching line section are performed by these devices during a pause; or artificially re-enable the line. Installing high-speed switching devices at switching points allows the necessary switching at one (emergency or artificial disconnection of Ls by automatic restarting. When installing the devices at the exit of the substation only at the first (emergency or artificial) disconnection with automatic restarting of the line, high-speed switching devices de-energize the entire pole of the line, and then, after preparing the circuit by means of switching by disconnectors, switch points, an artificial shutdown is performed with an automatic reclosing of the line, during the pause of which the fast switching devices switch on the specified circuit.

Claims (2)

1. Direct-current power transmission lines, containing isolated from each other poles of the same polarity and one voltage class, characterized in that, in order to ensure its uninterrupted work during the repair of individual sections, it is equipped with switching points along its length. 2. Electrical transmission lines according to claim 1, iw specifies that the switching point contains switching devices, such as disconnectors, two of which are connected in series to each of the isolated poles, and the connecting pole of the jumper is connected between the common points of the switching devices containing switching devices. 1 w sh { HL  nr .J