System design is the basis of a project. In Demirer Kablo, we firstly design the cable according to the data provided by the customer. Critical designs effecting cable’s current carrying capacity and losses such as depth of cables and distance between phases are then finalized. A route survey executed by our professional crew enables us specifying the cable cutting lengths and joint locations and finally proper cable system configuration is selected and projected. These cable system configurations are as follows:
This system is mostly designed for short length of circuits. A current continuously flow on the metallic screen because both ends are earthed.
It will automatically reduce the current carrying capacity in the conductor of cable while it provides no touching voltage at both end. This is a common method for the short length of Open Switchyard and transformer circuits.
This system is designed to prevent circulation currents on the metallic screen of the cables. This increases current carrying capacity of the cables directly. Induced voltage over metalic screen on the cable is proportional with the cable length and the current passing in the conductor. Single-Point Bonding Method can only be used for limited route length. Generally Screen Voltage Potentials at open-end (SVL side) limits the length naturally.
Cross-Bonding Method is commonly used for long length of circuits to balance the Impedances of the phases for flat formation and to minimize the induced voltages occured on the metallic screens of the cables at the same time.
Transposition equalize the Impedances while the Cross-Bonding connections done in the Link-Boxes minimize the Induced Voltages. There will be a current flow through the metalic sheath connections but, no significant current will flow over the screens.