SU60059A1 - High Voltage Three Phase Power Line - Google Patents

Description

Modern high voltage three-phase transmission lines are electrically symmetrical. All three wires are isolated equally from the ground.

The cost of building high-voltage electricity is tens and even millions of rubles. Consumption of acutely deficient non-ferrous metals and quality steel exported in thousands of tons.

Protection against lightning surges increases the cost of building lines even more. Thus, lines equipped with a protective steel cable, cost more than 55-75% more expensive lines without a cable. The use of land as a third wire to reduce the cost of building lines, i.e., a two wire transfer system - ground, has not yet found application on non-passable lines with a nominal voltage of 110 kv and more. EicTb 01СНО; vani to assume that because of the very strong electromagnetic effect, the system "two wires - the earth will not receive any distribution at all; specified nominal voltages x.

According to the present invention, as a security cable in

High-voltage three-phase transmission lines propose to use one of the transmission line wires, for which this wire is grounded either on one support (in this case it is equipped with spark gaps on the other supports) or on all supports. In connection with this, the equipment and the isolation of this phase can be simplified to the maximum, because its switching switching is limited.

In the first of these cases, the possibility of unimpeded stepping into the earth of charges of thunderstorm inductive influences and direct impacts is achieved by the presence of spark gaps on each support. The discharge voltage of these spark gaps is chosen to be commensurate with the voltage drop of the grounded phase during normal operation.

In the second of these cases, i.e., when grounding the wire tightly On all supports, the transmission line will be more light-proof, and the electromagnetic effect (due to a current branch to the ground) is insignificant, since the diverted current, as established by the author, is not large.

FIG. 1 is a schematic diagram of the proposed transmission line; “And FIG. 2 - the usual method of power supply and conduits; FIG. 3 - method of suspension wires in the proposed transmission line.

For power lines made by the software of the proposed system, i.e., with a grounded phase, there is no need for special safety cables, and, therefore, there is a saving: on cables. Since the wire of one phase is grounded, it is suspended almost without insulation from the earth, therefore, there is a saving on insulation | ph | Further, the design of the line supports is simplified. In particular, when using wooden n1N1X supports, it is POSSIBLE for mpocTiO to place two chains on one support.

In this way, savings are obtained on cables, on supports, on insulation and installation.

The subject matter of the invention.

High-Voltage Three-Phase Power Line, which is used as a cable stitch cable, grounded at one of its points and fitted with spark gaps on all supports, or grounded tightly at all. supports.

fig 2

fig 1

-TJ G °

R

H, 7, 1

/ V / / / ///////

FIG 3