Q:Briefly explain how an alternating current transformer works and why they are so important to the world’s electrical power infrastructure.

Current transformers are used extensively in the power generating and distribution systems. A current transformer is a dough-nut shaped device, winding actually, that slips around the cable you wish to monitor. The primary of this device obviously has one winding. Current transformers are used in the protection of network to operate circuit breakers, metering devices, reverse power relays , all type of sequence relays, I could go on and on. The nice part about current relays is the use of them keeps extremely high voltages from being taken to the control section of the equipment, thereby protecting service personnel from being exposed to these high voltages. A common current relay used for this purpose is a 5 ampere output at the rated current flow through the cable being monitored. For instance a 100:5 ratio.

Q:How to use a multimeter to determine the quality of small transformers

First with a multimeter resistance file RX1 or RX10 to test the transformer on both sides of the coil! Have to pass! Primary resistance large! Secondary resistance small! (Buck) And then test the first class! Can not pass! Basic determination is good! And then use the transformer at both ends of the primary coil to take the multimeter AC voltage 50-100 volts stalls! With a dry battery to touch the transformer secondary coil ends! At this point multimeter watch pin should have a strong swing! Induced current and mutual inductance voltage! This proves that the transformer all normal! No turn-to-turn short circuit!

Q:My device has 50KW should be used with much transformer

On the use of 50KVA transformer on the line, because your device will not appear at the same time the maximum power.

Q:27. Two transformer A and B with identical ratings, are to be designed with fux densities of 1.2 and 1.4 wb/m2 respectively. The weight of transformer A per KVA is(a) More than that of transformer B(b) Less than that of transformer B(c) Equal to that of transformer B(d) None28. Transformer action requires which type of flux?(a) Pulsating magnetic flux(b) Constant(c) Increasing(d) Alternating electric flux29. In what capacity transformer natural oil cooling with tubes is used(a) 3000 KVA(c) 500 KVA(b) 30 KVA(d) 750 KVA30. In full rating of transformer is 90 KW at a pf of 0.9, then its KVA rating is(a) 100(c) 90(b) 150(d) 80

27. (a) More than that of transformer B 28. (a) Pulsating magnetic flux 29. I do not think there is such a limitation on ONAN transformers. 30. (a) 100

Q:SGB10 transformer and SC (B) 10 transformer What is the difference between the two series where the difference, specifically to the 10 type and where the hope that the knowledge of a detailed explanation Thank you

The first is a three-phase isolation low-pressure foil around the second is a three-phase dry low-pressure foil around the 10 type is the same as the performance code level is the loss level is almost. The first of the matrix is dry or oil immersion is necessary to see the kind.

Q:Transformer fever how to do?

?National standard "dry-type transformers" GB6450-1986 on the dry-type transformer temperature limit to make the provisions. 1, the dry-type transformer coil, when the use of A-class insulation material, the ultimate operating temperature of 105 ℃, the maximum temperature rise should be less than 60 ℃; when the use of E-class insulation material, the limit operating temperature at 120 ℃ , The maximum temperature rise should be less than 75 ℃; when using B-class insulation material, the extreme working temperature at 130 ℃, the maximum temperature rise should be less than 80 ℃; when using F-class insulation material, the limit operating temperature at 155 ℃ , The maximum temperature rise should be less than 100 ℃; when the use of H-class insulation material, the limit operating temperature at 180 ℃, the maximum temperature rise should be less than 125 ℃; when using C-class insulation material, the extreme working temperature at 220 ℃ , The maximum temperature rise should be less than 150 ℃. ???The minimum temperature of the permissible transformer is the freezing point of the transformer oil, 10 # transformer oil, freezing point is not higher than -10 ℃; 25 # transformer oil, freezing point is not higher than -25 ℃; 45 # transformer oil, freezing point is not higher than -45 ℃ The ?????Transformer Equivalent Aging Principle

Q:What is the meaning of the transformer without excitation?

General power transformers are equipped with tap-changer, can be carried out in a small range of voltage regulation to meet the grid voltage fluctuations, as far as possible to the transformer output side of the voltage stability. There are two ways: 1, on-load regulation: it can be in the transformer with load, automatic or manual tap position switch. Because the switch is completed in an instant, so it will not affect the normal operation, that is, once, the second side are not power failure can be carried out under the circumstances. 2, no excitation voltage regulator (sometimes mistakenly said no load voltage regulator): is to be in the primary side and the secondary side are power outages, put the isolation switch to open the case, to ensure that the transformer in the absence of electricity, adjust the tap position , The regulator. 3, in the past, it is possible from the English No Load (no load) or On Load (contained) translated over, said to be no load regulator. This is not accurate, it is easy to be misinterpreted as: the transformer can be in the absence of load (current) when the regulator, without the need to control whether the power side. This is very dangerous, no excitation voltage regulator, it is very accurate, to the transformer side, the secondary side are power, in the absence of any excitation circumstances, to operate. 4, therefore, our professionals must change No - Load to Off - Eirecuit - Tap - Changing.

Q:I know that vector groups basically determine the phase shift, and paralleling two transformers with different phase shifts is a genuine disaster.Some phase shifts can occur due to difference in the dot place, but for Wye-Delta connection the phase shift is 30 degree even with same dot on the primary and secondary. Why ?

Transformer Phase Shift

Q:HELP!! My boyfriend wants to see transformers and he told me I had to study up first lol! He wants me to know who all of the characters are because apparantly its from a comic or cartoon or something? I dunno but can anyone tell me anything about the TRANSFORMERS? I need to know characters and storyline etc. basically just anything u knowThanks lol.

I have already seen it. It has opened here is Australia several days ago. I am NOT a transformers fan and only knew some names because I knew kids who played with the dolls. I am NOT into the comic either. I can tell you now YOU DO NOT NEED to know any names. EVERYTHING you need to know is explained in the movie. But DO go and see it. It is an AWESOME movie. (It takes a lot in a movie to impress me - so that's a lot for me to say it is an awesome movie. Acting is not the best you'll ever see But over all - it's VERY VERY well done)

Q:I think they can, especially since there has been a series of some sort in the US and/or Japan series on going since 1996. Here is the track record:The Transformers (1984-1987 season 1-4 in the US)Japan's cotinuation of G1:Transformers: Headmasters (1987)Masterforce (1988)Victory (1989)Zone (1990)Beast Wars: Transformers (1996-1998)Japan's continuation of Beast Wars:Beast Wars Second (1998)Beats Wars Neo (1999)Beast Machines (1999-2000)Transformers: Robots In Disguise (2001)Armada (2002-2003)Energon (2004-2005)Cybertron (2005-2006)Animated (2007-present)This also includes two movies with a third on the way:Transformers: The Movie (1986)Transformers (2007)Transformers: Revenge Of The Fallen (2009)They might not as long running and continuous as the Simpson but to me the franchise has a good case for being one of longest running series with all of its incarnations.

Not to downplay Transformers or their cultural impact on the world- but I'm going to disagree. Certainly Transformers is a world renown series, and has stayed active for an exceptionaly long time in a variety of different itterations- but I wouldn't QUITE go so far as to say it is one of the longest running although it is certainly more than most). I am assuming we are just talking about animated series too (since well, this is the animated section) because in the broad scope of ALL TV, then Transformers can't even light a candle to stuff like the Today Show or Sports Center which have both been going on for decades and have tens of thousands of episodes. But even if we are just looking at animated features, I would point to Sazae-san. That same series has been running since the 1960s and has thousands of episodes- and is still ongoing If we are looking at number of variations and types of shows, I'd say Mickey Mouse. He has countless movies and short films, and more than a few lengthy series that have been showing up for decades and decades still to come. And even if we are talking about animated series about robots- Gundam still has Transformers beat. It's been going on since ths 70s and has around twelve 25+ episode series, with dozens of specials and movies, and more than a handful of OAVs that range from a few episode on up to 13 or more. (absurd Gundam graph: anidb /perl-bin/animedb.pl?sho ) So yes, Transformers is quite exceptional- but there are just too many giants out there for me to consider it to be one of the longest.