hi henryOHM,
i would like to add my name to the list of people chasing Donald Beeman's masterpiece. You will surely make a lot of people happy if you can share with us your book in pdf format. just what scottyuk and jon47532 said it may be a public domain now. besides its a GE publication...
Wow, you are having a Buchholtz tripping with that size of transformer. Act now, bring the experts in who have the capability and right test equipment to analyze the gas which a Buchholtz relay is essentially intended for. They may also do transformer turns ratio (TTR) test and oil dielectric...
dpc,
your advise quite interest me. you mentioned that two neutral wire can be paralleled provided that they are as close to each other and must be in the same conduit. my query is . . . what would be the adverse effect if one in inside ferrous conduit while the other is inside non-metallic...
david beach,
if i may ask, what would the standard V/T be for a 3000:5? sorry i dont have IEEE book nor mfr's data. would appreciate your advise.
capuchi
that's right there are 2 CT's and 2 PT's since the kwhr meter is a 2-stator type. for long term the digital power meter is the best option.
thanks for the suggestions.
capuchi
I don't have the meters yet. I'm still undecided if I will go for digital or just analog for the meantime due to economic considerations. Big difference in price between analog and digital meters. I know it will a lot easier if I go for digital coz no need for voltmeter and ammeter switches. Am...
hi to everybody,
I plan to install ac voltmeter and ammeter on a 3 phase, 3-wire main dist. panel using transformer rated current voltmeter and ammeter to monitor current (amps) demand on the system. Can anybody please direct me to a URL or links that has sample wiring diagrams showing the...
You wont find any applicable standard. It's a matter of choice. I once found them in a military base power plant but it was there as an anti-slip mat because the floor was smooth and slippery.
capuchi
Hi to all!
We have a 500 KVAR Auto Correcting Capacitor consisting of 2 x 50 KVAR and 10 x 40 KVAR, 460 V, 3 phase, 60HZ. Five (5) of 12 switching contactors had contacts melted (some 2 poles melted, others 1 pole). Continuous current rating of the contactors is 80 amps at 460 V. The Cap Bank...
the electric man
i can not agree more with wbd. i just can't understand why the manufacturer would go ahead in energizing the unit knowing fully well of the situation. this would be a warranty liability issue in the future. are you ready to take the risk?
capuchi
to oldfieldguy, i haven't had a good laugh for the last couple of weeks. looks like i'm a nut laughing alone. it's the best medicine!
What's in a name? others would like to glamorize their calling. To me it does not matter.
to dpc and dandel
thanks for your response. just for general guidance, how much load unbalance can a transformer take or is tolerable without causing damage to the unit itself.
again your help will be appreciated.
capuchi
hi guys, i hope you can help me on this one. We have a 175 KVA, 480/240v, 3phase, 60 Hz. 65 degrees C rise, delta/wye neutral ungrounded dry type transformer with 15 % load and 40% unbalance. The unit is showing abnormal heating of 45 degrees C as shown by IR scan. Megger readings is 200 Megs...
itsmoked
you said using a 50Hz in 60Hz land is no problem. Question: What happens to the voltage on the secondary? Will it increase proportionately?
rick
Try inquiring from Advanced Test Equipment Corp. or AVO Multi-Amp Corp. The first is a equipment rental company while the second is the leading (I guess) Protective Relay Test Equipment manufacturer. They have test sets that comes in low voltage but high current output.
Hope it helps.
capuchi
To all of you
Wishing you a very Happy and Prosperous New Year! 2007 has been a good year and hope that 2008 will be even better.
More power to Engineering Tips and all forum participants
capuchi
