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danghieu153 Please provide a Block Diagram, or Single-Line-Diagram of the interconnected electrical components. Regards, Phil Corso

Mohit: Your topic is still of interest. Since, you were not able to provide additional info, I ask a favor... Please repeat the Disturbance Chart, but with an increase in clarity so that when expanded the data is legible enough for me to read ! On the other hand, acknowledge that your...

Mohit Sharma. Just a note. Although the slight speed change was something new, you have not revealed any progress by ABB. However, if I had the information requested, I might be able to prove incident's result was inevitable! Stay Well, Phil Corso

Mohit... I apologize for suggesting something that "turned you off"! I reasoned that you probably had the data in EXCEL, thus relatively easy to get. On the other hand, I had to extract a large amount of numbers from very hard to read printed charts, to solve the problem using...

Mohit... At the beginning of this project you presented a chart that tabled 2 Variables over time: a) Current Magnitude Vector. b) Current Vector Angle. The variables shown are exactly what is needed to find the "single key" to the question "Was it a 3-phase fault or not?" Unfortunately, the...

Mohit.... Now can you identify for me the Current and Voltage channels for the following locations: Q19) VCB-52G. Q20) VCB-52S (if available). Q21) Downstream side of Excitation Transformer. Regards

Thank you James ! Yes ! I need GT Parameters to calculate fault-currents for the usual case! BTW, Mohit, another question, Q17) what are cable parameters?) Another thought... I asked the wrong question in message #7 ! I should have asked Q18) Had the ABB-6080 (in question) operated properly for...

Mohit Sharama... Haven't forgotten you! Please provide the names of the "electrical function" assigned to each channel. My new questions are:, 12) GT Phase Currents, Ph-Ph Voltages, Phase Angles. 13) GT Rotor Current and Voltage. 14) Ground Fault Current if any. 15) Any other Channels associated...

Mohit.Sharama... Please provide more about Chamber Pics: 10) The one showing debris in the corner is definitely similar to that of a 3-phase-Fault, i.e., debris blown away from location of fault. 11) My reason for asking how the breaker-carriage, if retractable from the chamber, was properly...

Mohit.Sharama... 7) James' identification of system components was helpful. Did the Ground-Fault-Protective-Relay on 52S operate ? 8) Who is the VCB manufacturer? 9) If the VCB is mounted on a Pull-Out Frame, then how is it grounded/earthed? Phil Corso

Zaheeb834m... I suggest you address the topic "Delta vs Star" or "Star vs Delta" at the Magnifying Glass Symbol at the beginning of this thread? You will find many answers, dating back many years ! Regards, Phil Corso

Mohit.Sharama... 6) Forgot to ask earlier. Had the ABB-6080 on other units worked when responding to previous faults? Phil Corso

@Mohit.Sharama... My reason for asking about an SLD and the question about additional phase-fault currents was to determine how the 11-kV system was earthed/grounded, and was the fault symmetrical ! Furthermore. it is my opinion that fault-clearing-time was excessive ! Then... try to determine...

ebipoo... To start: 1) What are the motor's parameters: Rated-Volts; Full-Load Amps; No-Load-Amps; Starting-Amps; Winding-resistance-R; Back-emf: Net-emf? 2) Which method of braking are you using: Plugging; Regenerative; Dynamic? 3) When speed passes thru 0, does direction reverse? Regards, Phil...

Mohit.Sharama... 1) Please provide a simple Single-Line-Diagram showing Gen'r & Fdr ! 2) Do you know the cause of the Feeder CB trip: Cable, Bus? Other? 3) Did other two Gen'r phases show near-matching current lists? 4) Does Unitrol provide a listing of corresponding corrective output signals to...

Hello Jagadeesh... 1) Do you have a vibration study of the period between the time the generator is on-line, and the time it stops rotating? 2) Is it a Salient-pole or a Non-Salient Pole machine? 3) Has it been tested without the exciter? 4) When you said "too often... at manufacturer." are you...

Breddy... Most of the original forum-topic was related to different loading of generators, i.e., different Power (Watts) and different Reactive Volt-Amperes (VAr) ! Your question is based on what is called an Optimum-Power-Arrangement, or OPA, i.e, 3 generators, having different capacities, all...

B T V Jagadeesh Caution: Never kick with the toe-side of your shoe. Always use the heel-side! Phil Corso

B T V Jagadeesh One of my assignments was to witness testing of a 21,000 Hp compressor drive motor. Mfg personnel said they had checked everything... many times. At quitting time I asked permission to remain after everyone left to do some paper work. They said yes, but left an employee to keep...

Valence... You must provide additional information? 1) What version of the DEIF is it? 2) What are the parameters of the Generator controlled by the DEIF. 3) Is this a commissioning situation or has the unit been in operation a while? Regards, Phil Corso