Indicator for measuring oil level inside transformer sleeve through electric field and measurement method thereof

Abstract

An indicator for measuring the oil level inside a transformer sleeve through an electric field comprises a power unit which supplies power to a single chip microcomputer processor, an LCD and a capacitance digital conversion unit. A capacitance detection electrode achieves one-way transmission to the capacitance digital conversion unit, mutual transmission is achieved between the capacitance digital conversion unit and the single chip microcomputer processor, and the single chip microcomputer processor achieves one-way transmission to the LCD. By the utilization of different dielectric constants of transformer oil and air, the oil level is judged through different capacitance values of the detection electrode when oil exists, and no oil exists; in the measurement process, through vertical movement, the oil level is gradually found through multi-point measurement; in this way, the purpose of measuring the oil level inside the transformer sleeve in a non-contact multi-point mode without electrification is achieved, and the indicator has the advantages of being high in precision and safety.

Description

technical field [0001] The invention belongs to the technical field of liquid level detection, in particular to an indicator for measuring the oil level in a bushing of a transformer by an electric field and a measuring method thereof. Background technique [0002] Transformer is an electrical device used to change voltage and current. It plays a very important role in the entire power system. It not only requires a large number, but also requires safe and reliable operation and good performance. The health of the transformer is the guarantee for the safe operation of the entire power grid. The premise is that once the transformer is damaged and out of operation, it will cause losses to the operation of the entire power system. The transformer is mainly composed of iron core, oil tank, winding and bushing and other components. The transformer winding relies on the bushing to lead the lead wire out of the box, and the bushing plays the role of fixing, insulating and transmi...

AI Technical Summary

Problems solved by technology

However, this measurement method can only be measured online, and cannot be measured when the power is off. On the contrary, when the oil level of the transformer bushing is abnormal, the temperature of the transformer oil will be consistent with the environment after the emergency power off. Therefore, it is impossible to re-power on safely for work, which brings a lot of inconvenience and safety hazards to actual production

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