Questions tagged [distribution-network]

Power networks of medium voltage (2kV to 35kV typically) that connect the higher voltage transmission system to most of the electricity consumers. This tag covers anything related to electric power distribution system operation, protection, maintenance and capacity upgrade.

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Any tips for a new grad in power engineering in Australia?

I am close to graduating from EE at an Australian university. I've recently found a job in the electrical distribution field and I'm realising that I know close to nothing about the standards and ...
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63 views

Nodal voltage magnitude properties of electricity distribution networks

I am wondering how to know about an electric bus according to its measured voltage magnitudes (possibly and its corresponding real power injection profile). Following assumptions can be made: One ...
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2answers
53 views

Is it possible that the line frequency can change along the distribution network?

We use single-phase 220-230V~/50Hz here in Turkey. The line frequency may vary ±5%. One of my colleagues told me that he measured the line frequency in a factory (probably a customer's factory that we ...
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36 views

Where do I find electrical power transmission grid data?

I am looking for websites which provide datasheets of 3 phase electrical power transmission networks with information about their ...
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109 views

Can anybody tell me what these three white boxes are at the bottom of the power pole?

Can anybody tell me what these three white boxes are at the bottom of the pole? And how can I tell the number of the circuits on the electrical power pole and what voltages they have? Also, can I see ...
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25 views

TN-S system neutral point earth resistance

According to many sources on the internet, a secondary neutral earth resistor is added at the distribution stations (transformers) to reduce the earth fault current. My question is when using a TN-S ...
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2answers
29 views

In a transmission line, does the real current interact with reactive impedances?

simulate this circuit – Schematic created using CircuitLab According to the diagram above, if real currents do not interact with reactive impedances, then reactive loads should not worry the ...
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22 views

Meaning of impedances in IEEE Test Feeders

I'm having a dilemma about impedances for different line configurations in IEEE Test feeders. What do these impedances mean for arbitrary configuration like Configuration 601: Do they represent phase ...
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1answer
93 views

Return path for current flow in transmission lines?

We know that all current flow in loops, i.e. if they start at a source they must come back to the source. So for transmission lines, does the current that flow through our appliances in our homes go ...
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3answers
797 views

How does current flow to the ground in Delta connection (Ungrounded) in an Earth Fault?

I'm an electrical engineering student and I'm currently in In-Plant training in Electricity Company of my country. Recently I visited an electrical grid. I got to know about Earthing transformer. I ...
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3k views

Purpose of cylindrical attachments on Power Transmission towers

Attached below is an image of a Power transmission pole. What I am interested in is the cylindrical shaped objects attached to the transmission tower. Some other observations and relevant information:...
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288 views

Surge arrester placement in substation

Is it enough to place surge arrester on the terminals of the transformer in a substation, or every power line entering the substation should have its own?
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2k views

Why ship power distribution systems have no neutral?

What is the reason for this difference between the distribution systems of power companies and the systems implemented at ships?
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987 views

Convert kW generated per minute to kWh

I have the data of power generated by a solar panel per minute in kW. I need to calculate the total number of kWh generated per day. How do I do this? So far, I divided each value of kW by 60 and ...
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317 views

Precise definition of a “radial” electrical distribution system topology

I'm confused about what is meant by "radial" topology of an electrical distribution system. This site claims we can generally group electrical distribution systems into three classes: radial, loop, ...
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1answer
81 views

How do you close a switch on a high-voltage network?

This is something I've been curious about for a long time. Let's say you're a utility trying to connect two segments of a distribution grid. Both segments will have about the same frequency, because ...
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1answer
65 views

How to estimate/compute for disconnected neutral potential rise?

This is a different question, I want to know what could be the minimum distances between poles before the ungrounded neutral in one pole can create different potential from the other neutrals in other ...
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70 views

Regarding Power Market demand and supply

As I have read, that power supply should be equal to demand. As it can't be stored .So basically this means power is generated in real time. Consider an area where power comes from a Substation A, ...
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1answer
57 views

Edge betweenness centralities for distribution grids [closed]

Graph centralities like edge betweenness centralities are commonly used to study the vulnerability in transmission networks, can they equally be used to study radial distribution networks ?
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2k views

Why am I getting shocked from “hot” line and touching “ground” (Earth)

So I live in an EU country and don't have Earth grounding for my house. Still I am getting shocked when touching "hot" line (220VAC) and standing on "ground" (Earth). How is this possible? From my ...
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1answer
266 views

zig zag vs open delta

Can we use zig-zag connection of transformers instead of open delta in electrical distribution ? If yes, then which one is the more preferable compared to other and why ?
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473 views

Australian suburban power distribution

In Melbourne, Australia I see a lot of utility poles like the one in the picture below. There are power lines on two levels. Three lines on the top level and four lines in the lower level. I assume, ...
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95 views

Symmetrical three-phase power flow problem, √3

I have done quite a lot of research regarding the power flow problem for the steady state operation of an electric system. In many papers about the power flow problem the power flow equation are ...
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1answer
57 views

Approaching to Integral from Limit of Sum ->Finding voltage drop due to uniformly distributed load current on a distributor

As shown in the picture above, I want to calculate the voltage drop due to a distributed load. l is the length of the distributor; n is simply no of segments, n=l/Δx; I have written down the sum to ...
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1answer
747 views

Service Wire Burn

I have a Distribution Transformer rated 25kVA 14.4/240 kV installed in the system. One phase of the serving 3 phase line of our electric utility in 23kV primary side are faulted in Line to ground ...
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532 views

Isolation provided by transformers

I have a few questions about transformers and isolation. I will describe my understanding (maybe wrong) and questions about them. Transformers provide safe isolation by disconnecting two circuits ...