RU71807U1 - CABLE - Google Patents

Abstract

The utility model relates to the cable industry, namely, to cable designs for transmitting and distributing electric energy in three-phase networks for a rated voltage of 64/110 kV and 127/220 kV with a nominal frequency of 50 Hz. These cables can be used as inserts on impassable sections of the route of overhead power lines, as well as for making cable entries into converting substations. The main factors of economic efficiency are:

- reduction in cases of power outages;

- ensuring continuous supply of electricity;

- activation of hidden reserves of existing funds;

- quick response to overload;

- accurate conduct and forecast of loading in real time when new energy sources are introduced into the energy system.

Description

The utility model relates to the cable industry, namely, to cable designs for transmitting and distributing electric energy in three-phase networks for a rated voltage of 64/110 kV and 127/220 kV with a nominal frequency of 50 Hz. These cables can be used as inserts on impassable sections of the route of overhead power lines, as well as for making cable entries into converting substations.

In conditions of increased load and in extreme circumstances (for example, when an error occurs in the segment of the energy system, in which the electricity should be directed to other areas for compensation), it often becomes necessary to load the cable almost to the limit values allowed by the relevant provisions. In such situations, it is necessary to create conditions so that the maximum temperature limits of the cable are not exceeded. Due to the increasing complexity of thermal relationships along cable routes, the ability to continuously measure temperatures along a cable is of great importance. The temperature control system provides operating data in the event of a malfunction in the power system,

for example, areas of increased heating, which can lead to cable failure if the causes of overheating are not eliminated in time. The main element of the temperature control system are sensors. Fiber optic systems are suitable as distributed measuring sensors, since the temperature acts on the glass fiber and changes the properties of the optical fibers in a certain place.

The placement (integration) of the fiber in the cable design allows, ultimately, to reduce the number of cases of power failure, ensuring its continuity, while activating the hidden reserves of the system. At the same time, the efficiency of decision-making in the event of a system reboot sharply increases, and it also becomes possible to accurately conduct and forecast the load in real time when new energy sources are introduced into the power system.

This technical result is achieved in that in a power cable containing one conductive metal core insulated with at least three layers of extruded cross-linked polyethylene, the first layer is made of an electrically conductive cross-linked composition based on polyethylene, the second layer is made of insulated cross-linked polyethylene, the third layer is made of electrically conductive cross-linked composition based on polyethylene, a layer of electrically conductive is applied to an insulated core

water-blocking tapes, a screen of metal wires is superimposed on a layer of electrically conductive water-blocking tapes, between the metal wires of the screen, on a layer of electrically conductive water-blocking tapes, two optical modules are laid, each of which is an optical fiber in a protective sheath, on a screen of metal wire with a copper tape is placed between them by optical modules, a layer (filling) of hydrophobic synthetic material is applied on top and between the screen wires, and then a separator the first layer of extruded polymer layer of aluminum tape laminated with a polymer and the protective sheath.

Figure 1 shows a section of the claimed cable design (with the designation of structural elements).

INFORMATION CONFIRMING THE POSSIBILITY OF IMPLEMENTING A USEFUL “CABLE” MODEL

The cable contains one aluminum or copper, multi-wire sealed conductive core (1); three layers of cross-linked polyethylene are applied to the core, by extrusion, the first layer is made of an electrically conductive cross-linked composition based on polyethylene (2), the second layer is made of an insulated cross-linked polyethylene (3), the third layer is made of an electrically conductive cross-linked composition based on polyethylene (4) . Over the third

the core insulation layer, by the method of spiral winding, a layer of an electrically conductive water blocking tape is applied (5). A shield made of copper wires (6) is superimposed on a layer of an electrically conductive water blocking tape by spiral winding, and two optical modules (9) are laid between the wires of the screen, each of which is an optical fiber in a protective sheath obtained by extrusion from a heat-resistant polymer . Two optical modules are stacked diametrically, symmetrically with respect to the cable axis. Optical modules are stacked by spiral winding, simultaneously with the screen wires. A copper tape (7), which is part of the screen, is superimposed on a coil of copper wires and optical modules by spiral winding. On top of and between the screen wires, by extrusion, a layer (filling) of a hydrophobic synthetic material is applied (8). An extrusion method is applied to a layer of hydrophobic filling by an inner separation shell of a thermoplastic polymer (10). On top of the separation layer, in order to transverse cable sealing against moisture, longitudinal laying methods, an aluminum tape laminated with a polymer was applied (11). On a layer of a layer of aluminum tape laminated with a polymer, superimposed

sheath made of extruded thermoplastic polymer (12).

The cable according to the claimed utility model is characterized by the following parameters:

Long-term permissible core heating temperature - 90 ° С

Maximum permissible core temperature during short circuit - 250 ° С

The cable is designed for stationary operation when laying in the ground and in the air

The cable is designed for laying on the tracks without limiting the difference in levels.

Bibliography:

1. Cables and wires No. 3, 2007, G. Meshchanov

2. Soros Educational Journal, Volume 7, No 1, 2001,

3. O.B. Vitrick "The problem of" sensitive skin ""

4. The journal "Sensors and systems" No. 7, 2004

5. Cables and wires No. 1, 2002, B.V. Avdeev, E.N. Baryshnikov and others.

6. Standard IEC 60502-2 2005

7. IEC 60840: 2004. Power cables with extruded insulation and fittings for rated voltages above 30 kV (U _m = 36 kV) up to 150 kV (U _m = 170 kV) - test methods and requirements for them.

Claims (1)

A cable containing one conductive metal core insulated with at least three layers of extruded cross-linked polyethylene, the first layer is made of an electrically conductive cross-linked composition based on polyethylene, the second layer is made of an insulated cross-linked polyethylene, the third layer is an electrically conductive cross-linked composition based on polyethylene, to an insulated a layer of conductive tapes is applied to the core, a screen of metal wires is applied to the layer of conductive tapes, between the metal wires of the screen, a layer of conductive wires two optical modules are laid in water-blocking tapes, each of which is an optical fiber in a protective sheath, a copper tape is placed on the screen from a metal wire with optical modules laid between them, a layer (filling) of hydrophobic synthetic material is applied on top and between the wires of the screen, and then extruded polymer separation layer, polymer laminated aluminum tape layer, and protective sheath.