A kind of single-phase high-impedance auto-transformer
Technical field
The present invention relates to a kind of single-phase high-impedance auto-transformer, belong to the transformer technology field.
Background technology
In the high-voltage power system, need a kind of high-impedance auto-transformer, namely and the short-circuit impedance between tertiary winding associated winding pair can reach more than 120%, have enough short circuit tolerances to guarantee the tertiary winding.In order to realize higher short-circuit impedance, background technology adopts two kinds of way: ⑴ to increase the winding spacing, and splits associated winding, thereby the leakage flux that increases between winding improves short-circuit impedance; ⑵ at air core reactor of tertiary winding serial connection.The first realizes the method for high impedance, no matter is increase the winding spacing or split other winding, all can reduce the technical-economic index (increase material and increase loss) of transformer, splits associated winding and also can make the more complicated of transformer insulated system change.The major defect of second method is, the air core reactor capacity can not be done very greatly, the reactor winding of series connection also can greatly improve the lightning impulse insulation level of the tertiary winding simultaneously, so the scope that adopts the method for tandem reactor can improve the short-circuit impedance value is very limited.Therefore, under rational technical-economic index condition, adopt above-mentioned two kinds of methods, can't realize the short-circuit impedance value more than 120% between tertiary winding associated winding pair.
Summary of the invention
The purpose of this invention is to provide a kind of single-phase high-impedance auto-transformer, short-circuit impedance between itself and tertiary winding associated winding pair can reach more than 120%, simultaneously, the inner winding connection and reasonable arrangement of transformer, make single-phase high-impedance auto-transformer have higher Technical Economy, solve the problems referred to above that background technology exists.
Technical scheme of the present invention is: a kind of single-phase high-impedance auto-transformer, comprise single-phase iron core column, stem excitation winding, common winding, series connection winding, single-phase iron core side pole, the tertiary winding, other post excitation winding and pressure regulation winding, single-phase iron core column and single-phase iron core side pole consist of single-phase iron core, stem excitation winding, common winding and series connection winding are arranged on single-phase iron core column from inside to outside successively, and the tertiary winding, other post excitation winding and pressure regulation winding are arranged on single-phase iron core side pole from inside to outside successively.
The tertiary winding and common winding and series connection winding be not on same core limb, and common winding and series connection winding are arranged on single-phase iron core column, and the tertiary winding is arranged on single-phase iron core side pole.
Stem excitation winding and other post excitation winding form individual electrical loop, are used for setting up on single-phase iron core side pole common winding on the tertiary winding and pressure regulation winding and single-phase iron core column and the electromagnetic connection between winding of connecting; Realize between the tertiary winding and other post excitation winding and two parts leakage flux acting in conjunction between the winding of connecting, common winding and stem excitation winding, can reach the requirement of 120% above short-circuit impedance.
Single-phase iron core, stem excitation winding, common winding and series connection winding, the tertiary winding, other post excitation winding, pressure regulation winding that single-phase iron core column and single-phase iron core side pole consist of are arranged in a fuel tank, are the single box structure.
Good effect of the present invention: adopt the mode of connection of the present invention and winding arrangement, the distance or the built-in reactor that need not to increase between winding can increase Transformer Short Circuit Impedance, very economically realize the short-circuit impedance between very large and tertiary winding associated winding pair.
Description of drawings
Accompanying drawing 1 is elementary diagram of the present invention;
In figure: single-phase iron core column 1, stem excitation winding 2, common winding 3, series connection winding 4, single-phase iron core side pole 5, the tertiary winding 6, other post excitation winding 7, pressure regulation winding 8.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described by embodiment.
a kind of single-phase high-impedance auto-transformer, comprise single-phase iron core column (1), stem excitation winding (2), common winding (3), series connection winding (4), single-phase iron core side pole (5), the tertiary winding (6), other post excitation winding (7) and pressure regulation winding (8), single-phase iron core column and single-phase iron core side pole consist of single-phase iron core, the stem excitation winding, common winding and series connection winding are arranged on single-phase iron core column from inside to outside successively, the tertiary winding (6), other post excitation winding (7) and pressure regulation winding (8) are arranged on single-phase iron core side pole from inside to outside successively.The tertiary winding (6) and common winding (3) and series connection winding (4) be not on same core limb, and common winding (3) and series connection winding (4) are arranged on single-phase iron core column (1), and the tertiary winding (6) is arranged on single-phase iron core side pole (5).
Stem excitation winding (2) and other post excitation winding (7) form individual electrical loop, are used for setting up the upward electromagnetic connection between common winding (3) and the winding of connecting (4) of the upper tertiary winding (6) of single-phase iron core side pole (5) and pressure regulation winding (8) and single-phase iron core column (1); Realize between the tertiary winding and other post excitation winding and two parts leakage flux acting in conjunction between the winding of connecting, common winding and stem excitation winding, can reach the requirement of 120% above short-circuit impedance.
The single-phase iron core that single-phase iron core column (1) and single-phase iron core side pole (5) consist of, stem excitation winding (2), common winding (3) and series connection winding (4), the tertiary winding (6), other post excitation winding (7), pressure regulation winding (8) are arranged in a fuel tank, are the single box structure.