April 2020
Intermediate
296 pages
7h 37m
English
Content preview from Current Interruption Transients Calculation, 2nd Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
5Short Line Faults
5.1 General
The short line fault is so‐called because the fault in this case occurs at a short distance along a transmission line from the circuit breaker. The distance of interest is in the order of hundreds of meters to a kilometer or so and the fault is sometimes referred to as a kilometric fault.
The circuit for this case is shown in Figure 5.1 where VS is the source voltage peak line to ground voltage, XS the source impedance, VL the peak voltage at the circuit breaker line side terminal at current interruption and Xeff and Zeff are the effective line and surge impedances, respectively. The fault current IL is usually expressed as a percentage of the circuit breaker short circuit current rating IS. A 90% short line fault thus means that IL = 0.9IS.
The circuit breaker transient recovery voltage (TRV) is the difference between the source side TRV and the line side transient. At current interruption the voltage on the line side is VL with a decreasing linear voltage profile to zero along the line to the fault location as shown in Figure 5.2. The line side voltage must go to zero but it does not ring down in the way of an oscillatory circuit because now we are dealing with distributed rather than the lumped elements discussed earlier in Chapters 2 and 4. Instead the line voltage goes to zero by means of successive traveling waves as shown in the next section.
5.2 Line Side Voltage Calculation
The initial condition for the line side voltage is as shown ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.