Does anyone have any experience with using EMTP for transient recovery voltage analysis? I would like to have the ability to compare the resulting voltage profile (system response) with standard capability curves from a selection in a library. Any thoughts?

I would like to know what experiences users have with developing detailed complex control systems. In particular is there a way to initialize the controls blocks other than having to specify an initial condition for each individual block? This quickly becomes impractical as the controls model becomes more comlpex. Thanks.

Question:

What are the differences between the old EMTP type 59 machine and the EMTP synchronous machine model. 

Answer:

EMTP synchronous machine  enhancements :

1. It iterates with the network so it is much more numerically stable for larger time-steps;
2. It offers saturation modeling on both axes,
3. It has a much better predictor method.

I am doing a TRV study on a 345 kV reactor breaker. I noticed the EMTP example splits the reactor model in two.  Why is this?

Robert E Wilson

I want to gain confidence in my models of SiC arresters.  Does anyone have independent sources of information on this modeling in EMTP, or EMTP Version 3?

The IEC document 60071.4, named
"Insulation Coordination Part 4 - computational guide to insulation co-ordination and modelling of electrical networks", gives guidance on conducting insulation coordination studies. It proposes internationally recognized recommendations for :

• numerical modelling ;
• implementation of methods.

It includes examples.

Alain Xemard

Hello everyone,

Using EMTP in a batch mode for several case studies at once, i would like to know if that is also possible to do with the output result file. What i need is a way to get quickly (and automatically) a plot value directly stored in a file or wherever else, because trying to open the .mda file as a text file in order to scan for a particular value doesn't work (i have just read that it is written in a fortran-95 format, and i have no idea the way the binary data is stored - columns of x bytes ?).

All hints are welcome,

Best Regards,
Tarik Sadovic

Dear EMTP users,

We are currently working on the next issue of the newsletter in which we hope to get good number of contributions from you about different type of studies the users are involved with. 

I hope to get your feedback and ideas on this matter.

As a student in power engineering, I find EMTP and Scopeview are good tools for simulation. I have a question about Scopview here. When I wanna export waveforms from Scopeview to jpg file, there is always a small note at the left-down corner, which is “EMTP-filename”.

How can I eliminate this note in Scopeview?

I'm working in a project and I'm presently building a network with medium voltage and low voltage cables in EMTP environment.

I'm experimenting difficulties with the data for these cables and I would like to see an example for three phase medium voltage cable and four wire low voltage cable.

Fernanda Resende