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Dhamdev... Further to my earlier comment, the application of 10% primary current the applied ampere-turns (AT) is about 30-45 times the nominal exciting-current AT. Phil Corso

Dhamdev... good work! Regarding your question about not reaching the varnish breakdown voltage when you tested for the kneepoint, the CT had not yet been saturated. Regards, Phil Corso

Karma6... What did the MICS-Telys tell you were the pre-fault, during-fault, and post-fault parameters, specifically: kV; kA; kVA; kW; kVAr; pf; Hz; fuel-flow; and any other data considered pertinent enough to solve the problem!! >Hi, Regards. Phil Corso

Raj Kishor... I believe you have confused ABB's CT-series, DIN-rail mounted relays with ABB's programmable, digital-type protective relays that are used for station busbar protection! Regards, Phil Corso

Yashivar... your logic is correct! Apparently the system designers anticipated lower voltage conditions than normal,on the 132kV OVH transmission line. Regards, Phil Corso

Rafi... for another point of attack, see thread: http://www.control.com/thread/1026226787 Regards, Phil Corso

T.Sriram... search the Control.com Archives for Thread # 1026230152 (ca, July '07). There is discussion on varied IR test results caused by a dimensional differences in the objects being tested! Regards, Phil Corso

Ashish - the following comments and calculations are presented to answer to your question: 1. Load Amperes. [Ref 1] Load = 22.9MVA => IL = 1,200A/phase. 2. Cable Specification.[Ref 1] Single-core, Aluminum Conductor, 11kV; XLPE-insulated, Unarmored. 3. Cable Installation. [ref 1]...

Ashish... it is very important that I correctly interpret what you have presented about arrangement and grouping. Is the following correct? a) Arrangement: The 9 single-core are laid out horizontally. b) Grouping: R-R-R-Y-Y-Y-B-B-B. c) Spacing: Separation distance between cores in cm or...

Elabbassy... Yes, there is an organization in the US called the Midwest Reliability Organization. Regards, Phil Corso

Thiagarajan Sriram... You haven't provided answers to your thread # 1281076079! Phil Corso

Replying to BK's 26-Sep-10 (11:28)... could be ferroresonance! Can you forward a simplified Single-Line-Diagram showing major components? Regards, Phil Corso (cepsicon[at]aol[dot]com)

Ashish... Need to know: o 3 x 1/c or 1 x 3/c? o Average Ambient temperature? o Mechanically protected? Covered or not? Regards, Phil Corso

Mathew... can you send me a simple Single-Line-Diagram of your system. Even a hand-drawn sketch will do! Regards, Phil Corso (cepsicon[at]aol[dot]com)

Stevetatum... to continue discussion contact me off-list! Phil (cepsicon[at]aol[dot]com)

Stevetatum... No, you don’t parallel the secondary load-impedance to the transformer’s secondary-leakage impedance. This procedure will result in a large error! Also, reflection into the primary using the square of the voltage-ratio will be wrong. Are you familiar with the Method of...

Mea Culpa... The comments I made about voltage increase were for utilization facilities! Regards, Phil Corso

Pascal... I disagree with your position that voltage should be held at the nominal or rated value. There is benefit to raising the voltage, from 5 to 10%, in most (but not all) cases. The principal gains are a reduction of in-plant wiring losses, and an increase in the efficiency of...

Yogesh... is this the same AVR mentioned in your thread # 1283782527? Regards, Phil Corso

Technician... I suggest you search the Control.com Archives with key words like: XLPE; Insulation; Test; etc! If your search prove inadequate, then let me know! Regards, Phil Corso (cepsicon[at]aol[dot]com)