Double-ring on-load tap changer with ultrahigh impedance of 110 kV

Abstract

The invention discloses a double-ring on-load tap changer with the ultrahigh impedance of 110 kV, comprising an iron core, a low-voltage coil, a high-voltage tap coil and a high-voltage coil. The low-voltage coil, the high-voltage tap coil and the high-voltage coil are sequentially arranged outside the iron core, and the high-voltage coil adopts middle wiring. The invention realizes the performance of ultrahigh impedance and low loss at a lower cost.

Description

technical field [0001] The invention belongs to the field of transformers and relates to a 110,000-volt ultra-high impedance double-circle on-load voltage regulating transformer. Background technique [0002] According to the national standard "GB / T6451-2008 Oil-immersed Power Transformer Technical Parameters and Requirements", for the 110,000-volt conventional impedance double-turn on-load tap-changing transformer commonly used in power systems, the impedance voltage percentage under the high-voltage-low-voltage operation mode Usually 10.5%. [0003] With the economic development of the eastern coastal developed areas and the rapid increase of residents' demand for electricity, the 110,000-volt transformers in the original power system in this area are increasingly operating at higher loads or full loads, which will inevitably make the operation of the power grid safer. Hidden dangers have caused the single nominal capacity of the transformer to increase day by day, that i...

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Problems solved by technology

However, if the above-mentioned traditional coil arrangement structure is still used to achieve ultra-high impedance, there are two problems: First, for the most important performance of the transformer - load loss and no-load loss, this kind of blindly increasing the low voltage The main insulation distance between the coil and the high-voltage coil is very uneconomical, because due to the increase in the outer diameter of the high-voltage coil, the high-voltage voltage regulating coil is also pushed out, and the diameter becomes larger. In order to achieve the loss of the corresponding capacity The performance goal will consume more copper wires and silicon steel sheets with better performance levels; second, many transformers are updated or expanded on the basis of the original smaller-capacity transformers, which are affected by the original transformer foundation or substation layout. constraints, it is necessary to reduce the size and weight of the transformer as much as possible

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