Bissoy.com
Doctors Medicines MCQs Q&A

In T-T connection, the percentage tapping of main transformer and teaser transformer respectively are

In T-T connection, the percentage tapping of main transformer and teaser transformer respectively are Correct Answer 50%, 86.6%

Scott (T-T) connection:[ alt="F2 J.P Madhu 21.05.20 D1" src="//storage.googleapis.com/tb-img/production/20/06/F2_J.P_Madhu_21.05.20_D1.png" style="width: 586px; height: 361px;">

Concept:

  • The Scott-T Connection is the method of connecting two single-phase transformers to perform the 3-phase to 2-phase conversion and vice-versa.
  • Scott connection of transformer is also known as T – T connection.
  • The two transformers are connected electrically but not magnetically.
  • One of the transformers is called the main transformer, and the other is called the auxiliary or teaser transformer.
  • The main transformer is centre-tapped at D and is connected to line B and C of the 3-phase side. It has primary BC and secondary a1a2.
  • The teaser transformer is connected to the line terminal A and the centre tapping D. It has primary AD and the secondary b1b2.
  • The identical, interchangeable transformers are used for Scott-T connection in which each transformer has a primary winding of Tp turns and is provided with tapping at 0.289 Tp, 0.5 Tp and 0.866 Tp.
  • The teaser transformer has the primary voltage rating that is √3/2 or 0.866 of the voltage ratings of the main transformer.
  • So that in T-T connection, the percentage tapping of main transformer and teaser transformer respectively are 50% and 86.6%

 

Application:

  • The Scott-T connection is used in an electric furnace installation where it is desired to operate two single-phase together and draw the balanced load from the three-phase supply.
  • It is used to supply the single phase loads such as electric train which are so scheduled as to keep the load on the three phase system as nearly as possible.
  • The Scott-T connection is used to link a 3-phase system with a two–phase system with the flow of power in either direction.

 

Note:

  • The Scott-T connection permits conversions of a 3-phase system to a two-phase system and vice versa. But since 2-phase generators are not available, the converters from two phases to three phases are not used in practice.

Related Questions

Why is the offering of "teaser loans" by commercial banks a cause of economic concern? 1. The teaser loans are considered to be an aspect of sub-prime lending and banks may be exposed to the risk of defaulters in future. 2. In India, teaser loans are mostly given to inexperienced entrepreneurs to set up manufacturing or export units. Which of the statements given above is/are correct?
The following question consists of six sentences of a passage. The first and the sixth sentences are given in the beginning as S1 and S6. The middle four sentences in each have been jumbled up and labelled P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly. S1: It would be possible to adduce many examples showing what could be done with the limited means' at our ancestor’s disposal in the way of making life comfortable. S6: I hope, in this essay, to make that connection manifest. P: What have comfort and cleanliness to do with politics, morals, and religion? Q: But look more closely and you will discover that there exists the closest connection between the recent growth of comfort and the recent history of ideas. R: They show that if they lived in filth and discomfort, it was because filth and discomfort fitted in with their principles, political, moral and religious. S: At a first glance one would say that there could be no causal connection between arm chairs and democracies, sofas and the family system, hot baths and religious orthodoxy. The correct sequence should be
Consider the three-way handshake mechanism followed during TCP connection establishment between hosts P and Q. Let X and Y be two random 32-bit starting sequence numbers chosen by P and Q respectively. Suppose P sends a TCP connection request message to Q with a TCP segment having SYN bit = 1, SEQ number = X, and ACK bit = 0. Suppose Q accepts the connection request. Which one of the following choices represents the information present in the TCP segment header that is sent by Q to P?
If use auto transformer method starting to start an induction motor to replace star-delta method, then the required tapping on the transformer will be _________
A three phase transformer has a nameplate rating of 30 MVA, 230Y/69Y kV with a leakage -reactance of 10% and the transformer connection is wye-wye. Choosing a base of 30MVA and 230 kV on high voltage side, the transformer reactance referred to the low voltage side will be _______(in ohms).
A three phase transformer has a nameplate rating of 30 MVA, 230Y/69Y kV with a leakage -reactance of 10% and the transformer connection is wye-wye. Choosing a base of 30MVA and 230 kV on high voltage side, the reactance of transformer in per units is __________
A three phase transformer has a nameplate rating of 30 MVA, 230Y/69Y kV with a leakage -reactance of 10% and the transformer connection is wye-wye. Choosing a base of 30MVA and 230 kV on high voltage side, the transformer reactance referred to the high voltage side will be _________(in ohms).
A three phase transformer has a name plate details of 30 MVA and voltage rating of 230Y kV/69∆ kV with a leakage reactance of 10% and the transformer connection via wye-delta. Taking a base of 230 kV on the high voltage side, the transformer reactance on the LV side is ___________
A three phase transformer has a name plate details of 30 MVA and voltage rating of 230Y kV/69∆ kV with a leakage reactance of 10% and the transformer connection via wye-delta. Taking a base of 230 kV on the high voltage side, the transformer reactance referred to the low voltage side in ohms is __________
A three phase transformer has a name plate details of 30 MVA and voltage rating of 230Y kV/69∆ kV with a leakage reactance of 10% and the transformer connection via wye-delta. Taking a base of 230 kV on the high voltage side, the transformer reactance referred to the low voltage side in ohms is