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Member Information and Posts by PhilCorsoMember Name: Philip P. Corso
Several steps of external resistance used for speed control on motor appear to have uneven amounts of resistance. Is this possible? What will the effect on the motor be?
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Ben, using the procedure I suggested illustrates how the number of speed-torque curve increments...
Ben... this sort of problem can be solved using Symmetrical Components Analysis!
Say the...
Ben... please provide operating data:
a) Line-currents.
b) Supply phase-phase voltages.
c)...
What purpose do inductive VARs serve in an electrical grid?
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Hector... is your question, "How is the VAr component transmitted over the HVDC transmission...
Busbar Differential protection for MV switchgear for 2 out of 3 (2/3) Incomer logic
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Bob... the GSU problem you cited had to do with HV-winding capacitance differences between two...
Pal... Thanks for the your response. Nic provided some logic comments/details as a guide. But, I'm...
Multiple transformers being powered up simultaneously is blowing fuses on the primary side. When powered up one at a time the fuses hold fine.
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Jarod... sorry I should have said primary fuse-type and size!
Phil Corso...
Jared Hankovsky... Please provide the following information:
a) Transformer capacities.
b)...
Iron in IP Boiler
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Dkguerry.... can you provide a unit-of-measure, i.e., grains per gallon, or mg per liter?
...
Procedure for testing the correct operation of Honeywell Flame Detectors
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Anindya_Ray... As you had requested, the document was sent directly to your e-mail address! Please...
What will happen when 2 out of 3 poles of a 220 kv circuit breaker of a 330MVA Generator (of a steam power plant) is closed and one open when the generator (via GT) is connected (or synchronized)with 220kv bus?
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Santanu... The disturbance question I replied to was just the opposite of what you described, and I...
Santanu... if closure of the faulted-breaker at the instant both the generator-side PTs and the...
Collector ring standstill marks.
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GJRS... please provide information on slip-ring material, brush composition, environmental...
from the Electrical Engineering department...
How to calculate load power demand in the 3 phase power system?calculating the load power demand in the 3 phase power system.
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Minh… your approach seems enthusiastic but I question your Electrical Power Engineering knowledge!...
Minh... have you completed the Steady-State Load-Flow Study?
Regards, Phil Corso
...
Transformer short circuit and open circuit calculations on primary end
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Jerry... following are several Control.Com threads that discuss open-phase operation of xfmrs!!
...
Looking for a way to verify heater elements power with measured voltage and impedance
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EE... secondly, how were the Ohm measurements taken?
Were they made with the delta intact, or...
EE... the measured ph-ph resistances, i.e., 20.0, 27.0, 20.4 don't agree with those calculated from...
we have source of air flow app. 1000 rpm .Pl. suggest suitable single phase alternator for the same.
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Generator...
I forgot to mention viirtually all wind-power applications have a Betz factor well...
Generator… following is a procedure you can follow:
1) Determine the area, A, swept out by the...
Operation of induction generator
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Rob... I suggest you search Control.Com Archives for Induction Generator threads!
Regards, Phil...
After the generator is synchronized with the grid AND reaches floating stage, "WHAT MAKES THE CURRENT TO FLOW"
how can the reactive power affect the fuel consumption
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Prasad... your explanation is in error because even though kVA, hence armature-current, increases,...
from the electrical department...
what happens if turbine rated power is smaller than gen nominal powerwhat happens if turbine rated power is smaller than gen nominal power
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Dragan... Dave Amundson makes two excellent points that I completely overlooked. Based on his...
S.Zoghby, is absoluly correct.
1) There are qualified millrights that can properly couple and...
Is it allowed to run the gas turbine when having a battery ground fault (L64)?
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Abdollah... Followng is a scenario that illustrates why the unit should not be kept on line!
...
Siemens Supply Steam Turbine-SST-9000
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Dhinesh... developed for use with advanced Pressurized-Water-Reactors, it features a double-flow...
Generator breaker Trips when generator connected to DG
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Thair... how large is the load vs the load?
Regards,
Phil Corso cepsicon@aol.com...
Safety risk assessment report
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Vahid... send me your e-mail address!
Regards, Phil Corso
cepsicon@aol.com...
Tom... would you like a copy of my paper, "Probabilistic Risk Assessment of Safety...
voltage stepping up.
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Moses... this might be handled with Boost-Buck transformers, depending on what you meant by...
What is normal slip frequency for synchronization.
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MWO... I presume the SEL Auto-Sync system uses an Anticipatory Logic Scheme!
If so, then the...
MWO... which generator voltage is higher; incoming, or bus? Can you monitor the voltage-signals...
MWO... slip-rate is only one parameter during synchronization. What is the voltage differential?
...
What are the things to be checked before running a DG in parallel with a trafo.
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Nic... amendment to my earlier post:
Failure-to-trip probability, w/o tie-breaker, is (N)x(Qf),...
Nic... I too meant no disrespect of your knowledge, design experience, or commissioning skills.
...
Sangeetha... There is no way the DG-set can escape serious damage if the Main-Bus load is suddenly...
How much power taken by motor in no load condition?
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Praveen... your assumption is incorrect:
The relationship between no-load current and no-load...
control strategies for braking and industrial fan
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NTT... What do you mean by "Control Methods?"
Do you mean your own design? Or...
Newtothis... there are well over 250 "Braking" threads in the Control.Com Archives.
At...
Excitation transformer sizing details
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Mike... the answer to your question is no! That is, a transformer's kVA capacity is determined by...
Why the load angle of the alternator is kept low (20-40 degree)?
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Rock… The formula refers to Steady-State operating conditions, i.e., no changes. At 90º the system...
The 24 VDC from the safety barrier drops down to 0 VDC every time I connect my temp transmitter.
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A-B... it could depend on the type of barrier.
1) What happens to the input-voltage to the...
Running a three phase 400V 50HZ 2900RPM induction motor through a star delta starter
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Shaheed...
I will use my Gi.Fi.E.S. method (pronounced Jiffy's) for an approximate solution....
Shaeed... what is the motor size?
Phill Corso (Cepsicon@aol.com)...
questions about using a static frequency converter
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Chandru..
If your application is related to a motor drive, then contact Danfoss
If your...
Replacing the power transformer by another vector group transformer
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Mr. Jamiyandorj... your questions encompass a rather large topic. But if maximum reliability is the...
What is the correct answer of this question?
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Angel... because the generated voltages are 90° apart and the phase loads equal and resistive, the...
Is bringing an induction generator online from runaway speed similar to starting a motor DOL only torque is in the opposite direction?
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Hydro... in a nutshell, yes!
I want to clarify my statement that "... stress is similar to...
Hydro... the influence a motor's parameters has on its generator-action torque can be seen in the...
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