Controlling undesirable plants using electrical energy

1. A system comprising:

at least one contact electrode;

at least one collector electrode;

at least one voltage source for applying a voltage between the at least one contact electrode and the at least one collector electrode; and

means for moving the system in a direction of movement;

wherein the at least one contact electrode is fitted in a suspended fashion, wherein the at least one contact electrode has a length L, and wherein the at least one contact electrode is wound on a coil and the length L of the at least one contact electrode can be increased by unwinding from the coil and decreased by winding onto the coil; and

wherein a bending stiffness of the at least one contact electrode with respect to an external force that acts on the at least one contact electrode counter to the direction of movement is lower than a bending stiffness of the at least one contact electrode with respect to an external force that acts on the at least one contact electrode transversely relative to the direction of movement.

2. The system as claimed in claim 1 , further comprising a rail vehicle or a vehicle having means for moving on or along rails.

3. The system as claimed in claim 1 , wherein the at least one contact electrode has a width B and a thickness D, wherein the length L extends along the direction of gravitational force, the thickness D extends along the direction of movement and the width B extends transversely relative to the direction of movement and wherein the length L is at least ten times the width B and the width B is at least three times the thickness D.

4. The system as claimed in claim 1 , wherein the at least one contact electrode comprises a body composed of braided and/or twisted metal wires.

5. The system as claimed in claim 1 , wherein a plurality of contact electrodes are arranged next to one another in lamellar fashion transversely or obliquely relative to the direction of movement.

6. The system as claimed in claim 1 , wherein the length L of the at least one contact electrode is dimensioned such that a distance between a lower end, facing a ground surface, of the at least one contact electrode and the ground surface in the case of a stationary device is in a range of −0.5 meter to 0.5 meter, wherein a negative distance means that the contact electrode is touching the ground surface and that a region of the contact electrode that is in contact with the ground surface has a corresponding length.

7. The system as claimed in claim 1 , further comprising a dispensing device that feeds contact electrode material if the length L of the at least one contact electrode has decreased on account of abrasion.

8. The system as claimed in claim 1 , further comprising a separating device that separates worn contact electrode material in an automated manner.

9. The system as claimed in claim 1 , wherein the at least one collector electrode can be contacted with one rail belonging to a track installation or with two rails belonging to a track installation.

10. The system as claimed in claim 1 , wherein the voltage is obtained from the voltage source via an overhead line.

11. The system as claimed in claim 1 , further comprising:

an extinguishing apparatus in a rear region of the system;

one or more sensors for detecting sparks and/or fire; and

a control unit, which causes the extinguishing apparatus to release an extinguishing composition if sparks and/or fire are/is detected by means of the one or more sensors.

12. The system as claimed in claim 11 , wherein the means for moving the system includes a vehicle configured to move on or along rails in the direction of movement; and

wherein the extinguishing apparatus is disposed in a rear region of the vehicle.

13. The system as claimed in claim 12 , further comprising one or more sensors for determining a constitution and/or form of a track installation situated ahead of the vehicle in the direction of movement, and a control unit configured to adapt a length of the at least one contact electrode and/or of the at least one collector electrode and/or voltage parameters to the constitution and/or form of the track installation situated ahead.

14. The system as claimed in claim 11 , wherein the means for moving the system includes one or more sensors for determining a length and/or a degree of wear of the at least one contact electrode and/or of the at least one collector electrode.

15. The system as claimed in claim 1 , further comprising one or more sensors for determining a length and/or a degree of wear of the at least one contact electrode and/or of the at least one collector electrode.

16. The system as claimed in claim 1 , further comprising one or more sensors for determining a constitution and/or form of a track installation situated ahead in the direction of movement, and a control unit configured to adapt a length of the at least one contact electrode and/or of the at least one collector electrode and/or voltage parameters to the constitution and/or form of the track installation situated ahead.

17. A method comprising the steps of:

providing a system, wherein the system comprises:

at least one contact electrode;

at least one collector electrode;

at least one voltage source for applying a voltage between the at least one contact electrode and the at least one collector electrode; and

means for moving the system in a direction of movement;

wherein the at least one contact electrode is fitted in a suspended fashion, wherein the at least one contact electrode has a length L, and wherein the at least one contact electrode is wound on a coil and the length L of the at least one contact electrode can be increased by unwinding from the coil and decreased by winding onto the coil; and

wherein a bending stiffness of the at least one contact electrode with respect to an external force that acts on the at least one contact electrode counter to the direction of movement is lower than a bending stiffness of the at least one contact electrode with respect to an external force that acts on the at least one contact electrode transversely relative to the direction of movement;

applying a voltage between the at least one contact electrode and the at least one collector electrode;

moving the system over a region of earth in which plants are situated, and in the process:

contacting the at least one contact electrode with at least one part of at least one plant;

contacting the at least one collector electrode with:

a) ground in which the at least one plant is growing; and/or

b) another part of the at least one plant; and/or

c) at least one part of a neighboring plant; and

wherein a current flows between the at least one contact electrode and the at least one collector electrode, which current flows at least through a part of the at least one plant and weakens or destroys the plant.

18. A system comprising:

at least one contact electrode;

at least one collector electrode;

at least one voltage source for applying a voltage between the at least one contact electrode and the at least one collector electrode;

one or more sensors for determining a length and/or a degree of wear of the at least one contact electrode and/or of the at least one collector electrode; and

means for moving the system in a direction of movement;

wherein the at least one contact electrode is fitted in a suspended fashion; and

wherein a bending stiffness of the at least one contact electrode with respect to an external force that acts on the at least one contact electrode counter to the direction of movement is lower than a bending stiffness of the at least one contact electrode with respect to an external force that acts on the at least one contact electrode transversely relative to the direction of movement.