Voltage Line

Voltage Line

Construction cables overhead lines

Electricity transmission lines is still common way to transfer energy to larger distances. Due to the nature of the different voltage direct current lines and power lines. Introduction voltage systems, in particular the three-phase systems, facilitated the transmission of electricity for long distances. Currently, universal service are lines with a voltage of 400 and 750kV, and in some countries has already surpassed 1000kV. Lines are divided into:

* Low-voltage lines,
* High-voltage lines.

Lines can work in networks with neutral point grounded or with isolated neutral point. The lines of maximum tension, and most airlines are working in low-voltage networks grounded directly from the neutral point. Networks working with isolated neutral point may be offset or uncompensated. To fit under the low-voltage lines, which leads to a greater number of tubes, their positioning is different than in high-voltage networks. In the high-voltage lines are carried out for the three working lines and six conductors one wire fringe lines two wire. In these lines will be used as the basic layout of flat and triangular.
The system is characterized by flat-possible lower poles, and thus using less material, but does not quite wide area. This is of particular importance in the higher voltage lines, where the distance between the wires can be traced back even more than a dozen meters.
The system takes a higher triangular-pas, which is particularly beneficial in areas densely built, however, requires higher posts.
The two systems are different electrical parameters. Layout flat due to the same distance between the wires of different phases, characterized by antisymmetric induction.. In order to eliminate antisymmetric induction in the long lines on a flat crossover the wires. This is a change in the place of each, at 1 / 3 the length of the whole line. Crossover applies also in the triangular If you want to reduce the impact of low-voltage lines to facilitate parallel electrical lines.

Suspension-wires network accessories Accessories lines formed root, hangers, handles, clamps, attachments and minor elements to combine insulators between them, with the cable and the column. The fixture also includes elements to protect the insulation from the effects of arc-wand and protection rings. Insulators mounted on standing structures retaining with stems. The core of the insulator wrapped strips of hemp saturated mini and varnish or special material. On the so prepared core insulator is screwed. Depending on the method of attachment isolator apply root simple, Hook or straight.

To build a solid network of electricity you need: electric connectors, electrical lugs, cable connectors

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What is the line to ground voltage in a delta wire configuration?

I know that for three phase, to find the line to ground voltage you have to divide the line to line voltage by the sqrt of 3. Does the same apply for a delta wire configuration?

That depends. There are 3 different delta configurations used for services from power companies in the US.

If it is ungrounded, then there is no fixed voltage, but the phase to ground voltage is considered to be the same as line to line for insulation and the like. Ground fault detectors are needed to detect if a ground fault occurs.

Another option is a corner grounded delta, where one of the 3 phase conductors is grounded. The voltage to ground of the other 2 phases is then the line to line voltage.

Another option, used to be more common (our local power company does not do this for new services) is a hi leg delta or center of one phase grounded. This grounds the center of one phase like a single phase split phase service. For example, with 240V delta this will give 120V phase to neutral. This is not the same neutral as a wye, but it is considered a neutral and is grounded. Two of the phases have 120V to ground or neutral, but the 3rd phase is 208V to ground (that is the hi leg). It is only used as part of 3 phase loads (208V single phase loads are never used for that). The newer way to get 120V from 3 phase is with a 208V wye that has 120V phase to neutral.

Expliner Robot - High Voltage Transmission Line Inspection Robot #DigInfo