Outdoor totally-enclosed composite insulation three-phase combined mutual inductor

Abstract

The invention discloses an outdoor totally-enclosed composite insulation three-phase combined transformer. The transformer comprises three single-phase combined transformers of the same structure anda base, the three single-phase combined transformers are arranged to be a phase A, a phase B and a phase C respectively and evenly arranged on the base, and a junction box and a low-voltage terminal of a high-voltage primary coil are correspondingly arranged on the two sides of the lower portion of each single-phase combined transformer; the low-voltage terminals of the three single-phase combinedtransformers are connected through a line bank, the line bank is connected with a grounding terminal strip, and the grounding terminal strip is connected with a grounding terminal on the base. The three-phase combined transformer is compact in structure, excellent in layout, accurate in metering and stable and reliable in performance, the outdoor complex operation environment is fully considered,the current part can achieve three transformation ratios, the voltage part can achieve voltage conversion from 15 kV to 20 kV according to different requirements of users, installation is convenient,pollution flashover resistance is achieved, maintenance is avoided, the self-cleaning performance is high, electricity larceny prevention is reliable, and the operation life is long.

Description

technical field [0001] The invention relates to a transformer, in particular to a 15-20kV outdoor fully enclosed composite insulated three-phase combined transformer. Background technique [0002] At present, there are few three-phase outdoor combined transformers with a rated voltage of 15-20kV for domestic power system applications, and their product technology is not mature enough to be suitable for use in areas above 3000 meters above sea level. For example, patent 201811637129.8 discloses a three-phase four-wire combined transformer. This product adopts the technical scheme of combining three independent current transformers and one voltage transformer. According to the analysis, there are the following problems: the structure of the whole machine is complex, and such The huge combined structure, once the equipment is damaged or fails, all the transformers need to be removed before maintenance and replacement, which brings inconvenience to daily maintenance and overhaul...

AI Technical Summary

Problems solved by technology

[0002] At present, there are few three-phase outdoor combined transformers with a rated voltage of 15-20kV for domestic power system applications, and their product technology is not mature enough to adapt to Use in areas above 3000 meters above sea level

For example, patent 201811637129.8 discloses a three-phase four-wire combined transformer. This product adopts the technical scheme of combining three independent current transformers and one voltage transformer. According to the analysis, there are the following problems: the structure of the whole machine is complex, and such Huge combined structure, once the equipment is damaged or fails, all the transformers need to be removed for maintenance and replacement, which brings inconvenience to daily maintenance and repair, and greatly increases the cost of labor and equipment

Moreover, the sealing performance and anti-interference ability of the whole machine are poor, resulting in low mechanical strength, which is not conducive to the complex and changeable outdoor operating environment

In addition, this product adds SF6 and other gases to the current transformer. This type of gas is more harmful, prone to leakage, and has a shorter service life. Once leaked, it is not easy to volatilize. Therefore, regular maintenance is required, which will also greatly increase the work. Volume and cost, professional recycling is difficult to achieve

Images