Causes of Low Voltage in Homes with Long 30km Feeder from 132KV Gridstation

The Electrical Feeder via we receive power is about 30Km lengthy connected with 132KV Gridstation. We are facing low voltage problem from eight years. Another feeder having same problem is about one Kilometer away from Gridstation. What is the reason behind low voltage?

Hi,

From an article I've read, undervoltages are the result of long term problems that create sags. Sags are usually caused by system faults, and are also often the result of switching on loads with heavy startup currents.

You can try reading "The Seven Types of Power Problems("")":http://www.apcmedia.com/salestools/VAVR-5WKLPK/VAVR-5WKLPK_R1_EN.pdf?sdirect=true

Best,
Kevin

Thanks @kevin ANGELO MA

Has the overall loading in your region increased over the years. A common problem if it is always low is that the draw off has increased the loses in the lines. Substation transformers often have taps to allow for this situation, but not the ones on the street. Has the load you are drawing increased over the years, you may need a higher capacity on your local transformer. We had a problem with a lot of dairy farms in our area, the plant increased the line losses so much that the whole area was below the minimum standard. New higher voltage lines had to be installed, along with eighty new pole transformers. The problem went away.
Cheers,
Richard

Agree with your discussion/opinions/experiesnce. Ya there are some industrail laod been connected at the start of Line feedeer,.
But when there is raining the voltage get upto 100v input, which is normally 30/50v.
Here every domestic consumer have installed a Voltage regulator at Home Main Line, which is helpfull for stepuping the input low voltage 30/50v to 180/220v. But i think its not a permanent solution for it...
Thanks for comment...... #RICHARD GABRIC

Are there any returns via grounds anywhere in the system. Some high voltage transmission systems have the option of a ground return. This could presumably be effected by ground resistivity, which would drop if the ground is wet,
cheers,
Richard

Not such type of fault recorded ever.........

Is the information about the rain anecdotal, or has someone actually recorded the voltage on say a chart recorder for a year, and have meteorological records in the region for the same period.
If it is an accurate statement, then what might be happening in the region that changes during, or for a while after it has rained that could put a greatly increased load on the distribution system. I would assume that the distribution authority would know who all the large power users are, and when they put extra demands on the network, since they have to plan for peak demand(or in this case they can't plan, since they just don't have the capacity). The other possibility is that thousands of smaller users are for some reason placing greater demands on the system when it is not raining. What is your pattern of use, for example,
cheers,
Richard

There are many causes of low voltages. Some of them are:
1). Overloading of a particular phase.
2). Cable size.
3). Phase failure
4). Rust and worn out cables.
5). Loose connections.
6). Neutral failure.

One of the most common causes of low voltage is the overload of the system. Different times of the day, such as early afternoon, are typically high demand times. As is well known, hot days and weeks of the summer can cause a surge of power demand for air conditioners, a very power hungry set of machines. When the power company detects a large surge in demand, it will engage in the standard 5 percent reduction in power per home in a region. This can be a cause for weak voltage.

Excessive load of a conductor beyond its rated capacity causes voltage drop at other end.

One of the problem is imbalance. Modern electrical systems for homes feature three wires coming from the transformer into the house. The purpose is to spread the load demand equally, with the third wire as a “neutral” regulator. Under some circumstances, the load might be uneven. Causes of this imbalance are many and include things as simply as weaker wiring for one wire than the other. When the load is unbalanced and more electricity is forced through one wire over the other, the “overworked” wire will begin to provide less voltage than the demand would indicate, causing weak signals and voltage.

When the transmission length increases then voltage drop also increases. As the length in your case is 30Km the voltage drop is more and hence low voltage problem. It might be also that the loads are more in between the substation and your load point. this also reduces the voltage at your receiving end.

There are many causes for low voltage:
1.Overload
One of the most common causes of low voltage is the overload of the system. Different times of the day, such as early afternoon, are typically high demand times.
2.Distance
The problem here is “low load density.” This means that electricity must travel farther. In urban areas where people live close together, the increased density of “thickness” of the electrical signal is conducive to higher, or at least more regular, voltage per home.
3.Imbalance
Modern electrical systems for homes feature three wires coming from the transformer into the house. The purpose is to spread the load demand equally, with the third wire as a “neutral” regulator. Under some circumstances, the load might be uneven. When the load is unbalanced and more electricity is forced through one wire over the other, the “overworked” wire will begin to provide less voltage than the demand would indicate, causing weak signals and voltage.
4.Wires
The state of the wiring in an area is a common cause of voltage problems. Age and corrosion are a common cause of low voltage, as is dirty connections and poor insulation. Poor or damaged splicing work can also be a cause.