630kVA三相高温超导变压器的研制和并网试验

Development and Test in Grid of 630 kVA Three-phase High Temperature Superconducting Transformer

研发了630kVA、10.5kV/0.4kV三相交流高温超导变压器,并成功进行了并网试验运行。该变压器导线采用多芯Bi2223/Ag不锈钢加强高温超导带材;高压绕组采用多层圆筒式结构,层间置有绝缘和冷却通道;低压绕组采用并联饼式结构。铁心采用非晶合金材料,为三相五柱式结构。绕组置于环形带有室温孔径的玻璃钢低温杜瓦中,以保证铁心处于室温环境。超导线的绝缘利用自主开发的包扎机以聚酰亚胺薄膜采用双半叠包工艺进行绝缘包扎。经过对该变压器进行基本性能测试,满足并网试验运行要求。

A 630 kVA 10.5 kW0.4 kV three-phase high temperature superconducting （HTS） power transformer was successfully developed and tested in live grid. The windings were wound by hermetic stainless steel-enforced multifilamentary Bi2223/Ag tapes. The structures of primary windings are solenoid with insulation and cooling path among layers, and those of secondary ones double-pancakes connected in parallel. Toroidal cryostat is made from electrical insulating GFRP materials with room temperature bore for commercial amorphous alloy core with five limbs. Windings are laid in the toroidal cryostat so that the amorphous core operates at room temperature. An insulation technology of double-half wrapping up the Bi2223/Ag tape with kapton film is performed by winding machine which was developed by ourselves. Fundamental characteristics of the transformer are obtained by standard short-circuit and no-load tests, it is shown that the transformer meets operating requirements in live grid.