SU383159A1 - DEVICE TO REDUCE CURRENT IN DANGEROUS DRAINS - Google Patents

Description

one

This invention relates to high voltage electrical networks.

In domestic practice, the adopted suspension scheme for ground protection cables and high-voltage lines, in which the cables are isolated from the supports and cut into sections that are grounded at one point. energy and allows you to limit the 3. d. s., induced in the cables when the wires are closed the line to the ground.

At present, ground wire cables are becoming increasingly common for the organization of high-frequency channels for high-voltage lines. In this case, cables with an outer layer of metal with a low specific electrical resistance are hung on the lines. For communication, all cable sections are connected in series, insulated from the supports, and grounded at the ends through high-frequency layers. However, in this case, a closed coitur cable-ground is formed, through which a current flows during the operation of the state and a loss of electrical energy in the active resistance of the cables.

Devices are known for reducing the current in ground wire cables of high voltage lines containing static capacitors. However, the cable does not open at short

A short-circuited circuit appears on the line, and the accompanying current flows through the blocked spark plug, which, when short-circuited near the ends of the lipia, reaches a significant value. Moreover, when using the crossing of two cables, the accompanying current for the coiled sections of the cables does not change.

In order to provide self-extinguishing arc when the cable insulation is overlapped, the indicated capacitors include between the cable and ground at the ends of the sections;

When) the number of two cables, the use of the proposed device allows you to refuse to cross the cables or to reduce their number.

In the drawing, a schematic diagram of the device for reducing the current in the lightning ropes.

The device contains a lightning cable 1, an aerial fastening of the cable and insulators 2, a cable suspension assembly on insulators (on intermediate supports) 3, bypassing the spark gap a, static 1P1 condator 4, protective gap or surge 5, throttle 6.

To eliminate the current flowing along the cable and the energy loss associated with it, static capacitors are included in the cut of the ground circuit of the grounding cable by the ends of the line. Capacitive sonar capacitors

is chosen in such a way as to reduce to the possible minimum the flow of industrial frequency currents along the cable in normal mode and during short circuits in the line and to ensure the flow of high-frequency communication currents. The insulation of capacitors is chosen so as to prevent them from overlapping in the event of a short circuit on the line, when half of the induced e is placed on each of them. d. To protect the capacitors from impulse overvoltages spreading along the cable in parallel with the capacitor, a guard gap or valve arrester is turned on. In case a high-frequency communication is organized along the cables, then choke 6 is connected in series with the capacitor.

Subject invention

A device for reducing the current in ground wire cables of high voltage lines containing static capacitors, characterized in that, in order to provide self-extinguishing arc when the cable is insulated, these capacitors are connected between the cable and ground at the ends of the line segment.

z /

-rt