An indicator for measuring the oil level in the bushing of a transformer by an electric field and its measuring method

Abstract

An indicator for measuring the oil level in the bushing of a transformer by an electric field, including a power supply unit, the power supply unit supplies power to a single-chip processor, an LCD display screen, and a capacitance-to-digital conversion unit, and the capacitance detection electrode transmits unidirectionally to the capacitance-to-digital conversion unit, and the capacitance-to-digital conversion The unit and the single-chip processor communicate with each other, and the single-chip processor transmits one-way to the LCD display screen. Using the difference in dielectric constant between transformer oil and air, the capacitance value between the detection electrodes is different when there is oil and no oil to judge the position of the oil level. , the measurement process moves up and down, multi-point measurement, and gradually finds the oil level position, which realizes the non-contact multi-point measurement of the oil level in the transformer bushing under non-electrical conditions, and has the advantages of high precision and high safety.

Description

Technical field [0001] The invention belongs to the technical field of liquid level detection, in particular an indicator for measuring the oil level in a transformer bushing 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 safe operation of the entire power grid. The premise is that once the transformer is damaged and out of service, 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. The transformer windings rely on bushings to lead the lead wires out of the tank. The bushings function to fix and insulate the oil tank and deliver current to the outside of the tank. It not only has t...

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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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