Recent content by Ashdgee

Many thanks for your replies . Yes @Parchie I had swapped the CTR/VTR around as mentioned.

Good day protection engineers, I am struggling to see how in the SEL 411L protection manual example they managed to convert the line primary susceptance values to secondary values. I understand the primary values are derived from line characteristics like impedance, capacitance, geometry etc...

Thank you in advance

Good day I have been looking at protection schemes for series compensated lines, to be specific line differential. I saw that SEL have an alpha plane characteristic which is useful on series compensated lines. But the literature on ABB RED relays is a bit vague when it comes to this. For...

Thank you all . So this is something one needs to determine using a software program like ETAP as I suspected. @Oblsss you can find the tool here https://assets.website-files.com/5dc3329c429c1a9866f49d34/5e361dccf4dd537ac939bf90_CT-SAT-Calculator-PSRC.xls

Good day protection and control engineers I am busy familiarizing myself with CT specifications and saturation checks. I was recommended an IEEE CT saturation tool. Besides burden, primary fault current, I see on the main important parameters is the X/R ratio. How do I determine this at the...

Good day I have been asked to do a protection and grading study for a 11kV distribution network (doing in ETAP). One of the feeders coming out of the main 11kV substation has a series reactor installed on it, to limit the fault current seen by the downstream substation. The client has given me...

@RRaghunath Many thanks for explaining this

Good day protection and control experts. Im relatively new in the P&C field. Just a silly question, what is a "starter" when referred in the context of protection schemes. I have been seeing this term while goping through various papers on distance protection. Your responses are helpful.

Hi all, When it comes to Electromagnetic Transient Analysis , with respect to line modelling , can someone in layman terms explain the meaning of the following: 1. Phase domain of a line 2. Mode domain of a line. I see when doing EMTP Studies, some models included Phase-mode transformation ...

Hi all, When it comes to Electromagnetic Transient Analysis , with respect to line modelling , can someone in layman terms explain the meaning of the following: 1. Phase domain of a line 2. Mode domain of a line. I see when doing EMTP Studies, some models included Phase-mode transformation ...

Good day all, To those in design firms doing high voltage projects, where can I get some useful material on how to perform insulation coordination studies for HV substations and lines? Also, what software packages are you folks using for these kind of studies ? Regards

Many thanks

Hi all, I have done mainly substation design up to medium voltage level (44kV). I am starting to get into HV Design as well and I am going through a case study. My question is about Bay Control Units (BCUs).I see bay control units have digital inputs and outputs just like protection...

I am putting together a datasheet for an MCC panel for a copper mine. They require at least form 3b of internal segregation.I am listing form 3b for all the motors starters. The MCC Panel has a very large AIR Circuit Breaker (4000A) occupying a full tier. For the incomer and large starters...