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Electric power engineering | Forum profile
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Forum profile page for Electric power engineering on http://www.eng-tips.com.
This report page is the aggregated overview from a single forum: Electric power engineering, located on the Message Board at http://www.eng-tips.com.
This forum profile page summarizes the general forum statistics such as: Users Activity, Forum Activity, and Top Authors, which are reported in either a table or graph below for a given reporting time period.
Additional forum profile information for "Electric power engineering" on the Message Board at http://www.eng-tips.com is also shown in the following ways:
1) Latest Active Threads
2) Hot Threads for Last Week
Warning: These statistics are generated using 'best efforts' and can experience delays and reporting errors at times. Please note that such statistics do not constitute a forum's popularity and/or exact posting volumes at any given reporting period.
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Posting activity on Electric power engineering:
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Week
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3 Months
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Threads:
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81
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380
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1,027
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Post:
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250
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1,180
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3,390
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Electric power engineering Posting activity graph:
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Top authors during last week:
user's latest post:
GEC Alsthom 10 contact test...
Published (2009-12-04 02:07:00)
( Thanks Ohmly - I know exactly which plugs you are describing now. , )
user's latest post:
Primary Delta Transformer winding
Published (2009-12-03 13:23:00)
( If the open was from L1 to L2, The resistances will be; L1-L3, R=X Ohms L2-L3, R=X Ohms L1-L2, R=2X Ohms Assuming that the fault did not damage the other windings. , )
user's latest post:
Breaker Failure
Published (2009-12-01 15:21:00)
i would bet oil and air outnumber sf6 in N.A. as well. Slowly being replaced with SF6... Elements rarely get replaced when they are still in good working order. Those old oil breakers made in the 40s and 50s are almost indestructable.
user's latest post:
Cos phi regulation
Published (2009-12-02 11:09:00)
Hi. Thanks again. Yep, Scotty, I will open band and see. Actually, I don't want any additional logics, VAR compenstors. esee135, OLTC control base on the voltage limit, I will add also paralleling work of two transformers on the MCC priciple. Best Regards. Slava
user's latest post:
SEL300G Commissioning
Published (2009-12-01 21:13:00)
( I'd say plan on a week unless this is a copy of some previous installation. We just did an addition to an existing paralleling setup and it took about 3 days. This included installing settings, phase-out of wiring, startup and some fairly minor troubleshooting. The system was an identical copy of two existing units. It could be less if everything works as it should. Could be more if much troubleshooting is required. , )
user's latest post:
cable overheating
Published (2009-12-02 14:39:00)
Nice link to TI paper, Amptramp - thanks.
user's latest post:
Overheating of cables in trench
Published (2009-12-02 09:23:00)
I have checked the IEE regulation (which is available to me), there is no table to include soil thermal resistivity derating factor for cables. Whereas, from a manufacturer specification, with dry sand thermal resistivity of 2 K.m/W, the derating factor is 0.79 for 630sq.mm cables. If I am using IEE regulation the installation method 20 in Table 4A and derating factor of 0.47 for 630sq.mm in Table 4B3 (18 single core cables laid in...
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Latest active threads on Electric power engineering::
Started 1 week ago (2009-11-30 19:31:00)
by ScottyUK
( Not sure I'd have posted that document for all to see, but I agree that Areva's delivery dates are comically long, especially for stock items. They have been that way for a few years now. Is it a test block for the older MMLG series you are looking for? I drew a blank on the part number you listed. , )
Started 4 days, 6 hours ago (2009-12-04 00:37:00)
by davidbeach
Started 1 week, 1 day ago (2009-11-29 13:11:00)
by davidbeach
Sounds like a great assignment, no better way to learn about your new system. Every utility structures things a bit differently, so there is no telling what the relationship might be like, but you can always improve it. Use the techs as your eyes and ears; find out what they like and don't like about the present system. Sounds like the company doesn't have a database of relay settings, so ...
Started 4 days, 21 hours ago (2009-12-03 09:09:00)
by TurbineGen
( The SFC is simply to get the generator up to synchronous speed correct? After that you are closing in the breaker to the GSU transformer? Have you calculated how much power is required to turn the machine? Are you starting the machine with the draft tube/tail race purged? How much time do you calculate the SFC will be running? We need more information to help you with this. , )
Started 4 days, 15 hours ago (2009-12-03 15:24:00)
by ScottyUK
( Depends where the power comes from - do they have on-site generation, or are they dependant on the utility network? , )
Started 4 days, 17 hours ago (2009-12-03 13:23:00)
by waross
( If the open was from L1 to L2, The resistances will be; L1-L3, R=X Ohms L2-L3, R=X Ohms L1-L2, R=2X Ohms Assuming that the fault did not damage the other windings. , )
Started 1 week, 3 days ago (2009-11-27 10:34:00)
by marks1080
You might want to be more concerned about the short circuit current with the cap installed. I would assume you will need changes to whatever relaying or fuse coordination is on that line currently.
Started 1 week, 2 days ago (2009-11-28 16:56:00)
by davidbeach
I think you need to have a much better definition of what you are looking for. Transmission and distribution don't have much to do with wiring devices. What you might use within Autocad to generate panel schedules isn't going to be useful for T&D work. A good T&D package won't be of much use on the customer side of the meter either.
Started 5 days, 9 hours ago (2009-12-02 21:48:00)
by cranky108
Question 1: What would you do with the transformer after it were to fail? Would you take it to a rewind shop, or take it to a scrap yard? Question 2: Are you trying to remove a failed transformer, or protect it from an over load? A 100 amp breaker is a common size that probally won't operate on inrush, and is easy to coordinate with. Comment: I don't know anything about Canadian Electrical ...
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Hot threads for last week on Electric power engineering::
Started 1 week ago (2009-11-30 14:21:00)
by dpc
Is conduit metal? Is each phase in a separate conduit? If answer to both of these question is yes, the conduit may be getting hot due to induced current from the magnetic field created by the cable. The solution is to put all three phases in each conduit to minimize the net flux.
Started 1 week, 1 day ago (2009-11-29 13:44:00)
by ScottyUK
( Are you trying to test the relay, or the overall scheme? If the former then just use a relay test set. If the latter then you can use a generator to inject current into the transformer if you short one side and inject on the other. You will need to calculate the required voltage based on the current you want to circulate and the transformer impedance. I've attached a sketch of a test scheme -...
Started 1 week, 1 day ago (2009-11-29 13:11:00)
by davidbeach
Sounds like a great assignment, no better way to learn about your new system. Every utility structures things a bit differently, so there is no telling what the relationship might be like, but you can always improve it. Use the techs as your eyes and ears; find out what they like and don't like about the present system. Sounds like the company doesn't have a database of relay settings, so ...
Started 1 week, 1 day ago (2009-11-29 12:56:00)
by desertfox
hi EngAriz Can you give any information leading upto the failure and what failure as occurred. desertfox
Started 5 days, 9 hours ago (2009-12-02 21:48:00)
by cranky108
Question 1: What would you do with the transformer after it were to fail? Would you take it to a rewind shop, or take it to a scrap yard? Question 2: Are you trying to remove a failed transformer, or protect it from an over load? A 100 amp breaker is a common size that probally won't operate on inrush, and is easy to coordinate with. Comment: I don't know anything about Canadian Electrical ...
Started 1 week ago (2009-11-30 14:50:00)
by slavag
What is a 20kV winding of trasnformer: grounding/compensated/ungrounded/resistance. in case of compensated/ungrounded/probably resistance answers to both Q's-YES. Best solution against ferroresonance is broken delta connection of VT with dumping resistor. Best Regards. Slava
Started 4 days, 15 hours ago (2009-12-03 15:24:00)
by ScottyUK
( Depends where the power comes from - do they have on-site generation, or are they dependant on the utility network? , )
Started 1 week, 1 day ago (2009-11-29 11:21:00)
by davidbeach
Apply more than rated load and the motor will draw more than rated power.
Started 6 days, 13 hours ago (2009-12-01 17:29:00)
by cranky108
This partly depends on how you do your testing. Some companys don't test very much on microprocessor relays, and some companies test every function. In general a commissioning test of a new relay should follow the book, then a test of all the inputs, outputs, and metering. Also testing of the attached systems. Some settings require the unit to run to do the measurments. Some calculations, and...
Started 1 week ago (2009-12-01 00:22:00)
by esee135
I'm surprised you have a VAR limit versus a voltage schedule for your high side. In the ideal world you would have a sync-condense machine on each 6.6kV bus. Sounds like your issue is your high side operating guidelines are different from your low side. Are your 6.6kV station service transformers on both 6.6kV buses? I am guessing that you want stable 6.6kV voltage because of motor loads ...
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