Section 2. Sewerage of electricity

Overhead power lines with voltage above 1 kV. Suspension of fiber-optic communication lines on overhead lines

Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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2.5.178. A fiber-optic communication line on overhead power lines (FOCL-VL) is a communication line, for the transmission of information through which an optical cable (OC) is used, placed on the elements of the overhead line.

2.5.179. Requirements 2.5.180 - 2.5.200 apply to the placement of optical cables of the following types on overhead lines:

1) OKGT - an optical cable built into a ground wire;

2) OKFP - optical cable built into the phase wire;

3) OKSN - self-supporting non-metallic optical cable;

4) OKNN - non-metallic optical cable, attached or wound on a lightning protection cable or phase wire.

2.5.180. All elements of the FOCL-VL must comply with the operating conditions of the overhead line.

2.5.181. For the construction of a specific communication line, it is allowed to use several overhead lines of different voltages, coinciding in direction with its route.

2.5.182. During the construction of OK bushings for regeneration points and communication centers of power facilities on separate independent supports, the design and requirements for the parameters and characteristics of the bushings are determined in the project.

2.5.183. Elements of FOCL-VL, including inputs OK to regeneration points, communication centers of power facilities must be designed for the same climatic conditions as the overhead line on which this FOCL is located, and comply with the requirements of 2.5.38 - 2.5.74.

2.5.184. Optical cables placed on the elements of overhead lines must meet the requirements:

1) mechanical strength;

2) thermal stability;

3) resistance to lightning surges;

4) ensuring loads on optical fibers that do not exceed the permissible ones;

5) resistance to electric field.

2.5.185. Mechanical calculation of OKGT, OKFP, OKSN should be carried out for the design loads according to the allowable stress method, taking into account cable stretching and allowable loads on the optical fiber.

2.5.186. The mechanical calculation of the lightning protection cable or phase wire, on which the OKNN is located, must be carried out taking into account additional weight and wind loads from OK in all modes specified in 2.5.71 - 2.5.74.

2.5.187. Mechanical calculation of OK of all types should be performed for the initial conditions according to 2.5.71 - 2.5.74.

The values ​​of the physical and mechanical parameters required for the mechanical calculation of the OK, and the data on the hood should be taken according to the specifications for the OK or according to the cable manufacturers.

2.5.188. Optical cables must be protected from vibration in accordance with the conditions of their suspension and the requirements of the OK manufacturer.

2.5.189. When suspended on OHL OPGW and OKFP, their location must meet the requirements of 2.5.86 - 2.5.96 and 2.5.121.

2.5.190. Regardless of the voltage, the OHL OPGW should, as a rule, be grounded at each tower. The resistance of the grounding devices of the supports on which the OPGW is suspended must comply with Table. 2.5.19. It is allowed to increase these resistances while ensuring the thermal stability of OK.

In the presence of ice melting on lightning protection cables, isolated fastening of OPGW is allowed, provided that the resistance of optical fibers in terms of temperature satisfies the operating conditions in the ice melting mode and the current flow mode in this section (see also 2.5.192, 2.5.193, 2.5.195 ).

2.5.191. The need for grounding (or the possibility of isolated suspension) of the cable, on which the OKN is suspended, is justified in the project.

2.5.192. Optical cables OKGT, OKFP and OKNN must be checked for operability in terms of temperature when the maximum total short-circuit current flows, determined taking into account the response time of backup protections, long-range redundancy, the action of breaker failure and automatic reclosure and the total time of switching off the switches. It is allowed to ignore long-range reservation.

2.5.193. Optical cables OKFP and OKNN (when suspended on a phase wire) should be checked for operability in terms of temperature conditions at wire temperatures that occur when it is heated by the highest operating current of the line.

2.5.194. The electric field strength at the point of suspension of the OSN should be calculated taking into account the actual location of the cable, the transposition of the phases of the overhead line, the probability of disconnecting one circuit in the case of a double-circuit overhead line, and the design of the clamp (protector).

2.5.195. Optical cable type OKNN should be checked:

1) when hanging it on a phase wire - for resistance when exposed to the electric field of the wires;

2) when hanging it on a lightning protection cable - for resistance to the effects of electric voltage induced on the cable and direct lightning strikes into the cable.

2.5.196. The short-circuit currents for which the OK (OCGT OKFP, OKNN) is checked for thermal stability should be determined taking into account the prospects for the development of the power system.

2.5.197. The place of fastening of the OKSN on the support, taking into account its exhaust during operation, is determined based on the conditions:

1) resistance of the shell to the action of an electric field;

2) ensuring the shortest distance to the earth's surface of at least 5 m, regardless of the voltage of the overhead line and the type of terrain;

3) ensuring the distances from the OKSN to the phase wires on the support of at least 0,6 m for overhead lines up to 35 kV; 1 m - 110 kV; 1,5 m - 150 kV; 2 m - 220 kV; 2,5 m - 330 kV; 3,5 m - 500 kV; 5 m - 750 kV in the absence of ice and wind.

Taking into account the specified conditions, OKSN can be placed both above the phase wires, and between the phases or below the phase wires.

2.5.198. When attaching OKNN to a phase wire, the following minimum distances from the wire with attached or wound OK must be ensured:

1) up to the support structure when deviating from the effects of wind in accordance with Table. 2.5.17;

2) to the ground and engineering structures and natural obstacles in accordance with Table. 2.5.20 - 2.5.25, 2.5.30, 2.5.31, 2.5.34 - 2.5.40.

2.5.199. When suspended on an overhead line OK of any type, the supports and their fixings in the ground should be checked, taking into account the additional loads that arise in this case.

2.5.200. The construction lengths of the OK are connected in special couplings, which are recommended to be placed on anchor supports.

The height of the location of the couplings on the VL supports must be at least 5 m from the base of the support.

To the supports of the overhead line, on which the OK couplings are located, the access of vehicles with welding and measuring equipment must be provided at any time of the year.

On the overhead line supports, when OK couplings are placed on them, in addition to 2.5.23, the following permanent signs must be applied:

• FOCL symbol;
• coupler number.

See other articles Section Rules for the installation of electrical installations (PUE).

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