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Most power Transformers I have seen are filled with oil, and have a base rating of ONAN - which stands for oil natural, air natural. This is a cooling type. There are two main ways to cool a transformer above this rating - by using forced air - essentially attaching fans to help pull heat away, or using oil pumps.
With air, the next typical rating is ONAF, or if there are two different ratings (meaning some fans turn on at one, and all fans turn on at two) they may be named ONAF1 ONAF2. thiws stands for oil natural, air forced.
If oil pumps are installed, the rating will be OFnn for oil forced. It is possible to have both oil forced and air forced, or just oil forced - OFAN or OFAF. Just an FYI, in my experience oil pumps are typically avoided. It was discovered that pumping the oil can cause a static voltage buildup in the oil, which can lead to catastrophic failures; this doesn't seem to be a problem if oil pumps are not used.
What else can I help you with?
What is the name given to the large transformers used in transmission systems to step up and step down?
step up transformer
30MVA power transformer can uprated to what extend?
You need to discuss with a transformer manufacturer, because modifications will need to be made. The transformer name plate will say the top rating of the transformer (I'm assuming in this case it is 30MVA). This top rating is generally limitted by heating. So to uprate, you need to modify the cooling system - add more or bigger fans, add pumps, etc. In my area, loading as high as 125% of max rating of transformers is allowed on a "short term" basis (in general), which gives system operators time to shift load without dropping customers. If 30MVA is the base rating, I see typical values of 166% and 186% for ONAF1 and ONAF2 (oil natural, air forced level #1 and #2). This is something that is specified when ordering the transformer, so it may be different in your case (look at the nameplate!). The 30MVA base transformers I've seen, therefore are rated at 30/49.8/56MVA (at 65 degree C).
What are the advantages of instrument transformer?
'Instrument transformer' is the collective name for current transformers (CTs) and voltage (or 'potential') transformers (VTs/PTs). These transformers have two functions:to reduce the current or voltage in a high-voltage primary circuit to values that may be measured using regular ammeters or voltmeters ('burdens'), or to provide the current or voltage inputs to protection relays.to electrically-isolate their secondary burdens from the high-voltage primary circuit for the purpose of safety.
Why distribution and power transformer are rated in mva?
Transmission transformers are rated in mva. Distribution transformers are rated in kva. Power transformers are measured in va. There are, of course, exceptions, but this is the normal nomenclature.Answer (for UK terminology)In the electricity supply industry, the name 'power transformer' is used to describe those transformers used in the transmission system (400/275/132-kV levels), while 'distribution transformers' are those used in the distribution system (33 & 11-kV and 400-230-V levels). Power transformers and primary-distribution transformers are rated in megavolt amperes (MV.A), while secondary-distribution transformers are rated in kilovolt amperes(kV.A).Note that 'mva', 'kva', and 'va' are incorrect symbols for 'megavolt ampere', 'kilovolt ampere', and 'volt ampere'. The correct symbols are shown in the above paragraph (except that the period, or full stop, should be placed above the line).However, I suspect your question is really asking why are transformers rated in (mega) volt amperes rather than in (mega) watts? The answer is simply that the load that a transformer can supply is determined by the product of the transformer's rated secondary voltage and rated secondary current -the product of which (for alternating current) is the volt ampere, not the watt.
What is the significance of vector-grouping in Power Transformers?
Vector group of Transformer: a.)The three stage transformer windings can be joined a few ways. In light of the windings' association, the vector gathering of the transformer is resolved. b.)The transformer vector gathering is shown on the Name Plate of transformer by the producer. c.)The vector gathering shows the stage contrast between the essential and auxiliary sides, acquainted due with that specific setup of transformer windings association. d.)The Determination of vector gathering of transformers is imperative before uniting two or more transformers in parallel. On the off chance that two transformers of diverse vector gatherings are associated in parallel then stage distinction exist between the optional of the transformers and huge coursing current streams between the two transformers which is extremely impeding.
What is the full name of transformers 3?
The full name is Transformers: The Dark of the Moon.
What is the official name of transformers 3?
Transformers: Revenge of the Fallen
What are the name of the fourth transformers movies?
Transformers (2007)Transformers: Revenge of the Fallen (2009)Transformers: Dark of the Moon (2011)Transformers: Age of Extinction (2014)Transformers 5 (2017)
How do you identify a liquid transformer?
Most transformers have a name tag, start there. If it's outside, theres a 75% chance it's filled with oil. Generally oil filled transformers are housed in a cylindrical powder coated steel container, green, grey or tan. Ranging in size of pole mount(Keg), pad mounted (Car), to Substation transformers(size of your house) Larger Oil filled transformers have cooling capability, large radiator looking thing on the side with one to many electric fans blowing air past the cooling fins.
Are they making a transformers 4?
they are making a transformers 4 name unknown.
What is the name of transformers 3 going to be?
Transformers 3: Dark of the moon
Can you name every transformers?
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What is the Corvettes name in transformers?
In Transformers: Revenge of the Fallen, the Corvette is named Sideswipe.
What is the real name of transformers 4?
It might be named Transformers 4 Rise of Unicron or Transformers 4 Rise of Galvatron
Is Transformers going to have a fourth movie?
Yes, Transformers Is Going To Have A Fourth Movie, Its Name Is Transformers Rise of Galvatron. Nick
What is sam' s real name from transformers?
The real name of the charachter playing Sam's character in Transformers is Shia LaBeouf.
How many species are there of transformers name them?
3 so far transformers, transformers revenge of the fallen and transformers dark of the moon
