| The electric traction power supply system is shouldering the duty of uninterrupted power supply to the electric locomotive,it is the bridge between the electrical power system and users.But because the inherent characteristic of the traction load which causes low power factor, big negative sequence power and high harmonics content in the traction power supply system, has affected other equipment's normal operation, and has brought many bad effects to the electrical power system and the neighbor users.To solve these problems effectively and safely, is throughout the goal which we pursue together.In order to meet the request of high voltage and big electric current in traction power supply system or relieve the harmful effect of traction power supply system in electrical power system, the choice of the traction transformer wiring form in the traction transformer substation is very important.the YN(?) connective balanced transformer is precisely researched to overcome all sorts of questions above.It is same with the impedance-matching balanced transformer, the high-tension side neutral point may earth directly, suits 110kV and above high voltage transmission system in our country, and may reduce the insulation production cost;The low pressure side has the delta connection winding, it can constitute the circuit for triple frequency component excitation current, and improve the electric potential profile.It also has the characteristic of the Scott balanced transformer, namely the two-phase of low pressure side have not electrical relation, and can adapt the AT power supply way of electric railway high voltage, large capacity, long-distance range.In addition,because the YN(?) connective balanced transformer winding numbers are fewer, the impedance matching relations are easy to satisfy,the manufacture craft is simple, it can very conveniently draw out the tapping from the delta connection winding in the low pressure side, extract three-phase symmetrical voltage,which can be...
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