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Questions tagged [power-engineering]

Power electrical engineering. Includes industrial electrical engineering (i.e. motors, switchboards), transmission and distribution (poles, wires, transformers, grids) and generation.

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Does SPI Configuration Persist After DRV8873 Power-Off?

I am designing board to drive BDC motors using a DRV8908-Q1. Here is the data sheet. DataSheet I would like to inquire if SPI config persists (not go back to DEFAULT) after the driver is powered-off.
DAVID LOW JUNYI HCI's user avatar
2 votes
1 answer
95 views

Induction cooker power receiver

While building some small (single digit wattage) inductive power transmission systems, I wondered if a larger one could be build using an induction cooker as transmitter. What would be the mandatory ...
dronus's user avatar
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Startup and auxiliary/station transformer power parallel to bus

This question is in regard to switchyard/electrical distribution operations in a utility power plant. During a startup, the electric distribution system is lined up so that the startup transformers ...
BonnieEriesSpengler's user avatar
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2k views

How to calculate the earth fault current in a transmission system with no ground wire?

Background information, and my thought on the matter are provided in the end of the question. I need to calculate the fault current in case a fault occur for instance 10 km away from a transformer ...
Stewie Griffin's user avatar
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614 views

Calculating the line-to-neutral voltage of a generator

A three-phase generator is connected to a strong grid with line-to-line voltage 14 kV and frequency 50 Hz. The generator is rated at 15 kV and 180 kVA. The resistance in the windings is 2 Ohm/phase ...
gripen's user avatar
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How much information would a network protector need to determine if a backfeed is due to feeder failure or power export?

Many downtown or otherwise densely built-up areas, as well as some major metropoles (much of NYC, most notably), use secondary network electrical service to maximize service reliability and keep ...
ThreePhaseEel's user avatar
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36 views

Equipment for analyzing large DC distribution system

I'd like obtain the transfer function of a large DC power distribution system. My question is whether there's equipment (like vector network analyzers) designed to assist with modeling these type of ...
effectual_healing's user avatar
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88 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 ...
Edward's user avatar
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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 ...
Artur Müller Romanov's user avatar
1 vote
1 answer
50 views

About signal conversion

Question is weird but it's about something that I really want to try. AC power here in India has 50Hz frequency. What I really want to try is to make a series path with two continuous conversions. In ...
Jasmin Temp's user avatar
1 vote
0 answers
177 views

Where is my mistake in this power distribution system homework question?

I have attempted to solve this problem, but the answers don't match. Where am I making a mistake?
Umar Warraich's user avatar
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150 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 ...
ulama's user avatar
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Why can the total connected load be equal to system capacity ? what does "maximum demand of the entire system" really mean?

I read some factor in the power transmission ,and there are something i don't really understand Question 1 demand factor \$ = \frac{maximum \ demand}{total \ connected \ load }=\frac{maximum \ ...
electronic component's user avatar
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35 views

Currents injected in the grid, connecting a wind turbine

I'm studying the connection to the grid of a wind turbine through a three-phase inverter. Now I understand that , in normal operating conditions, in the connection to the grid, the reference for id ...
Granger Obliviate's user avatar
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0 answers
628 views

What will happen if the prime mover driving synchronous machine is accidentally disconnected?

What happens to a synchronous machine connected to an infinite grid, acting as a generator, when its prime mover fails i.e. when mechanical input at the shaft reduces to 0? I'm assuming that the ...
Deep's user avatar
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How is AC load distributed across on-site generation and the utility?

I’m trying to understand the physics behind AC load distribution when distributed on-site generation is installed and the load is also connected to the grid. In the diagram below, I have a building ...
Inquisitive's user avatar
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How is voltage induced in Yd transformer without neutral connection sinusoidal?

Thia is regarding bank of 3 single-phase transformers having star connected primary with isolated neutral and delta connected secondary. I know that for bank of 3 single phase transformer core flux ...
Deep's user avatar
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2 answers
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AD8318 Maximum Input Voltage

let's consider AD8318, a chip which contains a logarithmic amplifier, often used for power measurements. I have read its datasheet and there is a thing that I do not understand: no maximum input RF ...
Kinka-Byo's user avatar
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Power Distribution for multiple 5V consumers

I'm a newby in the field of Electrical Engineering (only basic knowledge from school). Nevertheless, I need to power up to 10 Raspberry Pis (5V, 2A) with Dupont Connectors and AWG24 cables over GPIO ...
m0r0n's user avatar
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Use of 3 phase transformers which are ∆-Y connected and Y-∆ connected

Different literatures say different things regarding ∆-Y and Y-∆ 3 phase transformer connection... Some say that ∆-Y is used for step down and Y-∆ is used for step up while others say just the ...
Abhishek Ghosh's user avatar
1 vote
0 answers
804 views

Power distribution boards - hierarchical numbering system

I wish to renumber the circuit breakers (and possibly the cables) in an industrial plant. Numbering should give a unique identifier for each breaker. Numbering should give a path back to the incoming ...
Transistor's user avatar
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Determining VA rating of the small transformers

I have a 1000VA toroid transformer which weighs 8 Kg. Based on this power-to-weight ratio, can I conclude that another transformer which is EI cored and weighs 7 Kg must be 875VA? Or such ratiometrics ...
soosai steven's user avatar
1 vote
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547 views

What is Virtual Array Antenna?

What is virtual array antenna (VAA)? I have searched it everywhere but i was unable to find direct answer to this question. I know this concept was built from phased array antenna. Please explain ...
Manroop Singh's user avatar
1 vote
0 answers
4k views

What is a Thyristor Switched Series Capacitor (TSSC)?

I'm struggling to understand the physical difference between the Thyristor Switched Series Capacitor (TSSC) and the Thyristor Controlled Series Capacitor (TCSC). From this book, I understand that a ...
Blue7's user avatar
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Mobile Power Distribution Unit: Mains Cable Size

I'm currently working on constructing a mobile power distribution unit and I need some assistance with a specific aspect of it. The unit is designed to accommodate both types of power networks found ...
TTransrecord's user avatar
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In an ETAP simulation, why do I get different tripping sequences depending on whether I simulate a short-circuit before or after a specific CT?

I have a simulation of a relatively simple power system on ETAP. Relays are selective with each other in the Star view, however when I simulate a short circuit, the sequence of tripping that I get ...
A.Bukhari's user avatar
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0 answers
103 views

Conversion from DQ0 to dq0 and vice-versa

I have been working with multi-machine power systems, and I have been struggling with the transformation between the dq0 and DQ0 frames. I will first introduce my understanding of these frames, and ...
Vitor Uekawa's user avatar
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81 views

Simple way to achieve constant output current from a boost converter for battery charging in an EV penetration simulation study using EMTP simulation

I am simulating Level 1 and Level 2 EV chargers to test the impact of such chargers on a grid in a developing country. I am simulating in EMTP-RV (software for simulation and analysis of power systems)...
Verny's user avatar
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2 answers
72 views

Does a control panel that will start/stop two pumps require its own circuit protection?

Does a control panel used to start/stop two pumps require circuit protection for the main 208V feeder lines if those lines are already protected at the main panel in a separate room? The main panel ...
voltron's user avatar
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154 views

For Delta-Wye transformers, with neither side grounded, can one get electrocuted by standing on earth and touching one of the Delta side wires?

It seems to me that there is no path to ground in this case. So, the voltage on the Delta-side of the transformer cannot drive a current through the ground (ie, through the one touching the wire), ...
CaptainFantastic's user avatar
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1 answer
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What happens on a DC-DC grid connection after a perturbation in the synchronous grid?

Consider the Continental Europe synchronous grid. This power system has some DC-DC connections with other countries (for example one with Great-Britain). Suppose now there is a sudden big outage ...
Samuele Benito Di Gioia's user avatar
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72 views

Is there anything to limit LED output dimming 50% while the wall dimmer controls 50% to 0%?

We got a project for a client but our lights are too bright for the space, we still want to sell the the lights because we have extra inventory and need a way to dim the LED output to 25W instead of ...
VV1993's user avatar
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0 answers
42 views

Sorting very different voltages and use them to charge batteries

I'm working on a project to produce electricity from a source that can produce sometimes negative, sometimes positive voltages, ranging from mV to kV depending on the situation, with very little ...
Antonio DG's user avatar
0 votes
1 answer
173 views

How are locations of power plant and distribution substation decided?

I'm trying to design a basic electrical system of a large island and I'm having trouble deciding for the site locations. The existing grid of the island has a diesel plant located near the town but I ...
Duts's user avatar
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69 views

Transformer load

I have 50 kVA delta-wye transformer with 3 single phases secondary (line-neutral) delivered to 3 houses, So if one of the 3 houses drown more power would that affect another 2 houses, or each phase ...
Muhammad Al-Moradi's user avatar
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0 answers
47 views

How close can a circuit board be to an overhead power line without being effected by EMI?

I am researching a technology that will need to put some circuitry near a power line used on the electric grid and I was trying to determine how close can I get to the power lines with my circuit ...
Will C I Am's user avatar
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0 answers
58 views

NEPLAN Load Flow Analysis with 1-day measurement

currently I am working on a project to identify energy loses in an electrical network. I am using NEPLAN 10, and already build a small system and implemented measurements. As soon as start the ...
Gustavio's user avatar
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55 views

Can electronic devices be installed on the pillar of UHV towers such as 345kV?

Can electronic devices be installed on the pillar of UHV towers such as 345 kV? Because I have an idea to install a remote automatic control electronic device on the tower to control the rotation and ...
care we's user avatar
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0 votes
0 answers
296 views

Inductance of composite conductor

Why L is calculated using average value and not by the formula 1/L = 1/L1 + 1/L2 + ...
Rahul Gill's user avatar
0 votes
0 answers
43 views

Selecting the correct wire for very short power transmission

Looking for the thinnest wire for very short distance power transmission. Supply is 5V, 10A. Ambient temperature is 35C. There are 5 consuming elements, each consuming 10W. The elements are linked ...
Gilad's user avatar
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57 views

Offgrid backup AC power option

I’ve been building an off grid home for a few years - recently moved in full time. Living in VT, with limited solar, we depend on a Honda EM6500SX 240v generator to occasionally recharge 20 batteries ...
Nkin's user avatar
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0 votes
0 answers
85 views

Convert AC grid to DC and back to AC grid same phase

I would like to execute long time running transistor switch tests with high currents. I would like to source AC power from grid, convert it to DC, pass through my transistor switch, after that I want ...
bladekp's user avatar
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0 answers
24 views

Can we control the data sending by Phasor Measurement Unit (PMU)?

Since PMU send the data after sampling the data to the PDC. Can we design any scheme so that PMU send the data to PDC only when I want? That means to reduced the communication bandwidth can we design ...
aman2909's user avatar
0 votes
0 answers
65 views

Reactive power of a discharged capacitor

I was wondering if a DISCHARGED capacitor connected to a grid gives to this one a positive reactive power. Is it yes? If not, it's true to say that only charged capacitors gives positive power to the ...
Samuele Benito Di Gioia's user avatar
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0 answers
122 views

Transmission line current magnitude

I want to compute the current magnitude in a transmission line. The line has properties b (total line charging susceptance, p.u.), ...
rrrrr's user avatar
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0 answers
64 views

How to handle duty cycle below deadtime in 2- and 3-level inverters

When programming a pwm for a 2-lvl inverter what would be the suggested strategy for a duty cycle close to 0% or 100%, meaning when I cannot guarantee for dead time. What would cause less distortion ...
Darki's user avatar
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0 votes
1 answer
34 views

Which case count as leading PF in Salient plot generator?

In the figure above we can see the location of two armature currents. In case 1, \$I_{a1}\$ is leading \$Vt\$ (terminal voltage) but lagging \$E_f\$ (excitation voltage). In case 2, it is obvious that ...
Will's user avatar
  • 11
0 votes
0 answers
676 views

Transmission Line Impedance 3 phase

I have the following question that I can't seem to figure out. The question ask to solve for the impedance of a 3ph transmission line. I've found the De (distance relative distance) and XL using the ...
Ace8888's user avatar
  • 41
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0 answers
81 views

Grid Tie Inverter Anti islanding

I was wondering about anti islanding design. Using grid tie inverters is usually the best choice when not investing in batteries, but suppose you have batteries and want the confort of grid tie AND ...
rodv92's user avatar
  • 73
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0 answers
59 views

Power management switch for Low-Power Application

In my low-power application I have a MCU waiting for an interrupt to wake up. (see picture) There are two sensor ICs (IC1, IC2) which consume very little and wake up the MCU via the interrupts. After ...
Maximilian Wiens's user avatar