Questions tagged [power-engineering]

Question 1

This is a single input power system stabilizer (PSS) I found from this report. The PSS transfer function is given by $$G(s)=K_\text{pss}\frac{sT_w}{1+sT_w}\frac{1+sT_{11}}{1+sT_{12}}\frac{1+sT_{21}}{1+...

Question 2

I have power transmission line model parameterized by R, X, and B all in p.u. This model is called nominal \$\pi\$ model if I am not mistaken. I want to convert this model into one that parameterized ...

Question 3

I’m designing a small power-distribution enclosure for laboratory equipment and want to verify that my proposed configuration is electrically sound and code-compliant. [120 V Main Connection from ...

Question 4

I have a little brain teaser based on my experiences in building electrical systems. When investigating electrical distributions in building renovation projects, I would often take amp readings using ...

Question 5

How do solar microinverters prevent back-powering an electrical grid during a power company power failure?

Question 6

My assignment: A simple power system consists of Generator of reactance j0.26 p.u., transformer of reactance j0.16 p.u. and a circuit breaker connected to a system of reactance j0.19 p.u. A three-...

Question 7

I would like to design a soldered board-to-board interconnect for ~260 signals. I have a 20 mm x 20 mm BGA land pattern, with a ball pitch of 0.8 mm (the matrix is not full) that is normally designed ...

Question 8

Problem: I have a 50 MHz clock signal on a PCB trace. That trace is going to two places: GPIO 0 on the ESP32 (where it's being consumed), and to the Collector of an NPN transistor (where it's ...

Question 9

I’m a PSI prep student, and as part of my studies, I’m working on a solar tracker system. My part focuses on studying the motor (the lower pivot that serves as the azimuth axis). Indeed, I’m trying to ...

Question 10

In the NPAG (any edition,) there is a diagram in section 1 which shows a number of relay tripping circuits. To my understanding: PR is the protection relay which initiates the protection and should ...

Question 11

In a press statement, the Portuguese grid operator REN says, on the topic of today's Spanish-Portuguese large scale power outage (source) It claims the outage that's affected Portugal was caused by a ...

Question 12

I have noticed on switchboard I am looking at two different methods of taking a single phase supply have been used. On one they take L1,L2,L3 from the bus into the breaker and only connect l1 & L2....

Question 13

In cable testing, what is the difference of using positive and negative polarity impulse?

Question 14

I'm trying to transition a situation from "Bad" to "Less bad, mostly backwards compatible." So comments about the current situation being "bad" are not particularly ...

Question 15

What would be a typical time-current curve for a fuse or circuit breaker protecting a 400 kVA transformer on the LV side (ca 577 A rated current), where all the houses or loads are connected? Is there ...

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Questions tagged [power-engineering]

Power system stabilizer identification

Convert transmission line model

Is it safe to draw 8 kW from a 120 V single-phase circuit (US)?

Power and Ground Amp Readings Don't Match

Preventing powering a grid during a power failure

Power system symmetrical fault calculation

Design soldered board-to-board interconnect

Transistors: High Frequency on Collector = Parasitic Coupling to Base. Is it dangerous?

Solar tracker continuous or sequenced operation

How does the NPAG's circuit breaker auxiliary switch allow the operation of the circuit breaker protection?

What are 'induced atmospheric variations', and how do they cause grid desynchronization? (Current Spain-wide power outage)

Why are two different methods used for taking single phase supply from this switchboard?

Difference between positive and negative polarity impulse voltage (1.2/50) [closed]

High current distribution for DIN rail relays

Time current curve

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