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Aditya, One of the most important thing is the local support for your system. Price will come next in my books. It is also vital that you know what PD testing techniques are employed by manufacturers. Some systems are good if you have past history, some are good if you install them on new...

In IEEE Color Book series, there is one in particular on Distribution IEEE - 141. This nearly 800 page book/standard is an excellent document to read.

Belanz, I would like to know which equipment do you use for PD testing? Does your company make test sets? Olic

I have used KELMAN Transport X. Its an excellent device which is maintenance free when you compare it with a GC. Moreover, unlike GC, Kelman PAS technology has made DGA a very portable and compact instrument. It can be easily moved around. I also agree with ausphil that its an ecellent device...

I am interested in knowing the exact technical limitations of digital TTR sets. What specifications i should ask for when i want to test 1 MVA to 500 MVA power transformers from 3.3 KV voltage upto 500 KV.

Thanks stevenal. its A. B. Chance.

Autocad is just a drawing software. If you talk specifically about design softwares which have modules for panel drawings, SLDs, etc and give you help in design and calculations, then you need to look at following: ETAP EDSA SKM Power Tools PSS/e or now PSS/SINCAL NEPLAN DIGISILENT These are...

Hubbel Inc. USA; i could not recall one of Hubbel companies that make portable earthing equipment. Boddington Electrical USA

1 & 2. The frequency depends on current state of the winding, machine age, PD activity levels, etc. If you have carried out tests recently, you can decide based on the results. For newer machines upto 5-8 years in service life without severe signs of PD (during your initial testing and physical...

belanz, thanks for the reply. Like you i am also a big supporter of PD testing. Over the years i have been involved in PD testing of rotating machinery using commercial instruments from Adwel, Power Diagnostix and Lemke. I agree with what someone has written above that PD testing is more...

Generator emf/voltage is given by the equation: Emax = 2 * pi * B A N f Now 2, pi, A, B, N are all constants for a given machine. So we can conclude E directly proportional f or E/f is constant. This is mathematical expression. For a given machine with a certain magnetic flux density...

This is a great discussion mostly focussed on cable testing. There are few areas which should be dicussed as well: 1. How close will the PD results from factory and those of field in harsh noisy environment match and how can they be compared with each other? To me PD testing and evaluation is...

This is quite interesting. Views from field guys show that they have more FAITH in hand cranked units. Interesting or rather striking thing is that even with advancement of digital technology, there are instruments from older days still preferable and mainly because of higher reliability and...

You may also look at www.infratek-ag.com. They have two models which i know: 106A and Infratek 31 Hand Held. These are economical as well. Olic

Hi, I would like to know the relative advantages / disadv of hand cranked v Digital TTR sets available from various vendors. Any document would be of real help. Reply with points is also appreciated. Thanks in Advance, Olicg

I need to design a three phase AC resistive load bank for diesel generator load testing. I dont have time or budget to go for buying a load bank. A temporary made bank would serve the purpose. I was wondering what loads to use, what type of cooling to provide, etc. Can someone refer me any...

Another question i forgot to add in my previous post is that what is the effect of interefence on the two types of C&DF testing, 28 V versus 10 KV. Olic

I was looking for a paper or an IEEE standard for a comparison of low versus high voltage C&DF testing, but could not find anything of value on net. Which is more effective? I think all the latest standards recommend at least 10 KV testing for HV transformer and bushings except for the power...

Let me put it straight. I just use name of TDC as an example. I have Bailey INFI90 installed at my site. And we want an HMI upgrade of the system alone keeping intact the cotnrol / I/O / Communications system which is called in PCU in Bailey terminology. Bailey is now acquired by ABB. ABB has...

I have posted this question as eariler as well but it could not get attention of anyone. Maybe too important and interesting discussions were on at that time to notice this rather simple thing. I wanted to test 138 KV CT/PT bushings for Tan Delta / C&DF test. We have Biddle 2.5 KV, 12 KV and...