It is useful to know what the voltage is transmitted through the transmission line (PTL), as each has its own voltage safety zone from the wires.
Minimum voltage power lines - 0.4 kV (voltage between each phase conductor and by zero - 220 volts). These lines are typically used in the country settlements, they look like this.
A characteristic feature - a small white or transparent insulators and five wires (three phases, zero phase for lighting lamps).
For voltage transformers to feed the same holiday villages used lines 6 and 10 kV. 6-kilovolt lines are used less and less.
Unlike the low-voltage line in the amount of insulators. Here, they are much more. Each wire is used one or two insulator. Wires are always three.
It is important not to confuse these lines. I read the sad story of the would-be builders who want to connect the mixer directly to the power line wires and foolishly threw hooks to the 10-kilovolt wires instead of 220 volt.
The following standard nominal voltage power lines - 35 kV.
This transmission line is easily identified by the three insulators, in which each wire is secured.
At line 110 kV (110,000 volts) each wire insulators six.
At line 150 kV insulator on each conductor 8-9.
220 kV line are most commonly used to supply electricity to substations. The garland of 10 insulators. 220 kV transmission line can vary greatly from each other, the number of insulators may be up to 40 (two groups of 20), but they have one phase is always transmitted on a single wire.
Recently in Moscow at the intersection of the Moscow Ring Road in Kaluga highway and put two supports 220 kV unusual species. About them in detail told Nefer, this photo of her Lent.
Transmission lines of 330 kV, 500 kV and 750 kV can be recognized by the number of wires of each phase.
330 kV - two wires in each phase and 14 insulators.
500 kV - three wires disposed delta phase and from 20 in the chain of insulators.
LEP 750 kV - 4 or 5 wires located square or ring, for each phase, and 20 in the chain of insulators.
Verify the accuracy of the determination voltage can be, let's see what is written on the power transmission line pole. In the second line shows the number of electric poles, and the first line contains the letter and number after the dash. Number - the number of high-voltage lines, and the letter - voltage. The letter T represents a 35 kV C - 110 kV, A - 220 kV.
Clearance to the live parts for different types of transmission lines.
Information and a part of the photos for this post largely pochorpnuta from Article Both insulators to determine the voltage of the HV.
© 2016 Alex Nadozhin