Integrated monitoring method and device for oil level and oil temperature of distribution transformer

Abstract

The invention provides an integrated monitoring method and device for oil level and oil temperature of a distribution transformer. The oil temperature of the transformer is measured by a first acoustic surface wave sensor embedded into a floating part, environmental temperature is measured by a second acoustic surface wave sensor arranged on a shell, the floating part vertically moves as the oil level changes, a connecting rod drives an identification pipe to vertically move in the shell, a magnetic substance vertically moves along with the identification pipe, on or off of a magnetically controlled switch is controlled when the magnetically controlled switch on the shell is within or without the action range of the magnetic substance, the magnetically controlled switch is turned off whenthe oil level of the transformer is excessive low, environment temperature signals are interrupted, an antenna of the sensor is turned off, and oil level alarm signals are triggered. The integrated monitoring method is based on passive wireless intelligent monitoring technique of the acoustic surface wave sensors and magnetic control technique, and the method has the advantages of simple structure, comprehensive monitoring function, high integration level, convenience in installation and maintenance and the like.

Description

technical field [0001] The invention relates to an on-line monitoring method and device for distribution transformers, in particular to an integrated monitoring method and device for oil level and oil temperature of transformer oil based on surface acoustic wave sensors and magnetic control technology. Background technique [0002] The temperature rise of transformer oil usually reflects the load and heat dissipation of the transformer. The oil level reflects the seal and oil leakage of the transformer. Non-electricity monitoring such as oil temperature rise and oil level is very important for the safe and reliable operation of oil-immersed distribution transformers. The traditional distribution transformer temperature rise monitoring is realized by wired sensing, but the oil level cannot be monitored (it can only be visually checked by marking the site). At the same time, the functions of ambient temperature, oil temperature and oil level detection are all designed in isol...

AI Technical Summary

Problems solved by technology

The traditional temperature rise monitoring of distribution transformers is realized by wired sensing, but the oil level cannot be monitored (only visual inspection can be carried out by marking the site)

At the same time, the functions of ambient temperature, oil temperature and oil level detection are all designed in isolation, not only the electrical and mechanical structures are complicated, but also there are reliability problems in power supply and signal transmission; ordinary top-mounted tube oil level gauges cannot realize remote monitoring functions

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