High saturation magnetic flux density anti-resonance voltage transformer

Abstract

The invention discloses a high saturation magnetic flux density anti-resonance voltage transformer which comprises an iron core, a high-voltage winding and a low-voltage winding, wherein the high-voltage winding and the low-voltage winding wind the iron core. The iron core is annular. According to the high-saturation magnetic flux density anti-resonance voltage transformer, through using the annular iron core, air gap hysteresis loss which is caused by a traditional laminate iron core air gap can be effectively prevented, thereby increasing saturation magnetic flux density. Furthermore the voltage transformer body is placed into an oil tank which is filled with transformer oil, thereby improving insulation strength and preventing cracking of the casted voltage transformer.

Description

technical field [0001] The invention relates to a high saturation magnetic density anti-resonance voltage transformer, which belongs to the field of high voltage measurement. Background technique [0002] At present, due to design reasons, the 35kV oil-immersed electromagnetic voltage transformers used in domestic power systems basically have saturation characteristics in the excitation characteristics at 1.2 to 1.5 times the rated voltage, which does not meet the requirements of the State Grid countermeasures: the neutral point is not For an effective grounding system, the excitation characteristics of the voltage transformer require a saturation point of 1.9 times. Although the saturation point of the excitation characteristics of the cast voltage transformer can reach 1.9 times, but because the thermal expansion and contraction characteristics of the material are worse than that of insulating oil, many cast voltage transformers have material cracking during use, resulting...

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Problems solved by technology

[0002] At present, due to design reasons, the 35kV oil-immersed electromagnetic voltage transformers used in domestic power systems basically have saturation characteristics in the excitation characteristics at 1.2 to 1.5 times the rated voltage, which does not meet the requirements of the State Grid countermeasures: the neutral point is not For an effective grounding system, the excitation characteristics of the voltage transformer require a saturation point of 1.9 times

Although the saturation point of the excitation characteristics of the cast voltage transformer can reach 1.9 times, but because the thermal expansion and contraction characteristics of the material are worse than that of insulating oil, many cast voltage transformers have material cracking during use, resulting in failure.

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