Currents in 110kV, 220kV, & 440kV High Voltage Networks: Understanding Current Orders

Hello,
Which orders are the currents in high voltage networks (110 kV, 220 kV and 440 kV)

Regards

I would like to aim for 1A because the losses on the wires = I?xR. Losses increase to the square of the current and when we have 1A -> 1? = 1 they will be the lowest. Therefore, when transmitting energy over long distances, we raise the voltage to even several hundred thousand. Volt

Thanks a lot for the theory.
And from a practical point of view - what order of currents are there in these networks.

In the high-voltage networks (from 110kV up to 750kV in Poland), large currents flow, because they transmit large powers (they are tens and hundreds of amps and the powers are already tens or hundreds of MVA).

I greet everyone

jjanek

Hello.

In RE where I work, the currents in the GPZ on 110kV lines in amperes: 160, 100, 60, 80. For the 110 / 15kV transformer on the lower voltage side of 450A, SN15kV lines take from a few to about 80A

Regards.

PS. What I gave are the instantaneous values but I hope they give a picture of the current values.

The current that flows depends on the network load. And this varies depending on the time of day or even the year of the year. The demand for energy in Poland is highest in January, in January 2000 it was on average over 21,000 MW. The problem of Electricity is that we do not lack it, so we manage its resources properly and determine the amount of energy needed in various ways ... it's not that one power plant works for itself and something is connected under it!

As for the currents, different currents will flow on the same lines. Take, for example, a transformer that supplies a village with medium voltage, and the same transformer that is installed in a cinema and has to cope with a great load.

Therefore, it is not possible to define unequivocally what current will flow. I am writing here about low and medium voltage lines! How it is on high voltage transmission lines, I do not know: /. but I guess you really try to keep the intensity as low as possible, because then the losses are as low as possible !!

The question was "Which ROWS are the currents flowing ...". So I answer: in the order of hundreds of amps.

Welcome back.

The values of the currents that I gave were taken from the Power Disposition of the Energy Region in which I work. The 750kV line that my colleagues mentioned has theoretically a transmission capacity of 2000MW, so please calculate what current should flow then - the wires on this line are 4 cables with a cross-section of 525mm? arranged in a square with a side of 40cm, if I remember correctly.

Regards.

twardyboro wrote:

Welcome back.

The values of the currents that I gave were taken from the Power Disposition of the Energy Region in which I work. The 750kV line that my colleagues mentioned has theoretically a transmission capacity of 2000MW, so please calculate what current should flow then - the wires on this line are 4 cables with a cross-section of 525mm? arranged in a square with a side of 40cm, if I remember correctly.

Regards.

I will just add that this line, the only one in Poland with such a voltage, has not been sent a single kilowatt-hour for several years, because Ukraine does not work synchronously with UCTE. And on the other side, there is not much left of this line, we even make commas under it.

A colleague is right - the line has been without tension for several years, although on our side of the border it is ready for use and can be switched on at any time. However, the 750kV switchgear itself is energized from time to time. Coming back to the topic, currents of the order of several dozen to several hundred amperes flow in the HV lines.

Regards

It all depends on the number of GPZs on a given line and the load they consume, but they are certainly currents in the range of several amps to several hundred. The load on one GPZ in my area reaches 25MGW

Hello,

Active power supplied to a medium-sized city (up to 50,000 people) is in the order of 40MW. Of course, it depends on the time of day, season, and the specificity of the city and its surroundings (type and number of industrial plants). Assuming that such power is transmitted via one 110kV line, the current will be:

I = P / (?3 * U * cos? = 40000 / (?3 * 110 * 1) = 210 [A],

so it is in the order of hundreds of amps . I assumed the power factor as 1, in fact it is close to one.

The order of currents flowing through the HV line can also be assessed by analyzing the parameters of current transformers offered by various companies. You can find a lot of catalog cards on the web.

Thank you for all your comments.
The topic is considered closed.
Regards