Transformer is to be defeated change one of main facility in electric system, although its efficiency is very tall (prep above of large transformer efficiency 99. 5 ％ , small-sized transformer also is in) of 98 ％ above, but because its total capacity is large (the 5 ～ that usually the total capacity of transformer is hair capacitance 7 times) , increase level of the commutation in be defeated by distribution system many, loss can occupy the 17 ％ of circuit total loss. Medium or small although distribution transformer is odd stage size is small, but the amount is much. Our country asks to be inside shorter time, promotion uses small waste time can transformer, transform high cost can transformer, this is energy-saving dig go, the efficient way that raises economic benefits.

　　 Transformer is energy-saving transformed specific means includes: Fall look, protect a facial expression, add look and attune to allow 4 kinds of methods.
(1) winding changes make a way: Change tall, low-pressure winding to fall look doctrine; Change tall, low-pressure winding to move look way; Change tall, low-pressure winding to fall, the law that move a look; Change tall, low-pressure winding to maintain look standard; Change way of quality of tall, low-pressure winding; Change tall, low-pressure winding to add look way.
(2) core changes make a way: Change is total core law; Law of exchange part core; Law of core of exchange part column; Change is total yoke law; Law of exchange part yoke; Law of progression of column of core of increase and decrease; Law of diameter of column of core of increase and decrease; Odd a jackknife core law; Core silicon steel piece jackknife law; Core silicon steel piece new insulation law.
(3) winding, core changes a way completely: Change winding, core to add look way completely; Change winding, core to maintain look standard completely; Change winding, core to fall completely look doctrine.

　　 Through the transformer that the section can transform, technical index and requirement all should accord with a country to concern formulary requirement:
(The sky of 1) transformer carries loss ratio to change 45 ％ ～ is reduced before making 55 ％ , excel JBl300 silicon steel of cold rolling of I(of one 73 standards piece)
Data, obtain data of transformer of small loss of S7 or SL7;
(70 ％ left and right sides is reduced before 2) sky carries electric current to be made than changing;
(3) sky carries short circuit to loss accords with GB or concern a provision;
(4) impedance is pressed fall control is in 3. 6 ％ ～ 5. 5 ％ (3 ～ 1OkV, 30 ～ ～ of 1600kVA) , 6 ％ 7. 7 ％ (35kV, 50 ～ 1600kVA) .