公开(公告)号：WO2014154320A1

公开(公告)日：2014-10-02

申请号：PCT/EP2014/000567

申请日：2014-03-05

Applicant: ABB TECHNOLOGY AG

Inventor： BANASZCZYK, Jedrzej ,  RYBAK, Andrzej ,  BACHORZ, Lukasz ,  IBARRA, Claudio ,  KERN, Joel ,  JOHNSON, Charles ,  HARTMANN, Thomas ,  STEINMETZ, Thorsten ,  CARLEN, Martin

IPC: H01F27/32 ,  H01F27/36

CPC classification number: H01F27/324 ,  H01F27/325 ,  H01F27/362

Abstract: The present invention relates to an active part of a dry-type distribution transformer having an insulation system with electrical field control. An active part of the dry transformer comprising a core (1) with yokes (2) and limbs (3) having an a longitudinal axis (A) around which LV coils (4) and winding bobbin (5) is placed concentrically. The bobbin (5) has a shape of a longitudinal cylinder (5a) which is ended with annular discs (5b). The bobbin (5) is made of material having a dielectric permittivity which is two to five times higher more the dielectric permittivity of the insulating body (8) surrounding the limb (3) around the axis (A), in which the LV coils (4) and HV coils (6) are embedded. The external facial surfaces of the insulating body (8) is provided with a metallic layer (10) having such electric conductivity that the part of the insulating body (8) between an internal surface of the metallic layer (10) and an external surface of the annular disc (5b) has a thickness (d3) which is sufficient for insulation. A side surface of the cylinder (5a) is covered with a resistive layer (7) being a control shield of an electric field around the limb (3) of the core (1) and the HV coils (6) and the LV coils (4).

Abstract translation: 本发明涉及具有电场控制的绝缘系统的干式配电变压器的有源部分。 干式变压器的有源部分包括具有轭（2）的芯（1）和具有纵向轴线（A）的四边形（3），LV线圈（4）和绕线架（5）围绕该轴线同心地放置。 线轴（5）具有以环形盘（5b）结束的纵向气缸（5a）的形状。 线轴（5）由具有介电常数的材料制成，介电常数是围绕轴线（A）围绕肢体（3）的绝缘体（8）的介电常数的两倍到五倍，其中LV线圈 4）和HV线圈（6）。 绝缘体（8）的外表面设置有具有导电性的金属层（10），绝缘体（8）的一部分位于金属层（10）的内表面和外部表面之间 环形盘（5b）具有足够的绝缘厚度（d3）。 气缸（5a）的侧表面被电阻层（7）覆盖，电阻层（7）是围绕铁心（1）的肢体（3）和HV线圈（6）和LV线圈（ 4）。