Thermal life monitoring system and method for paper oil insulation transformer

Abstract

The invention provides a thermal life monitoring system for a paper oil insulation transformer. The thermal life monitoring system comprises an alarming temperature controller provided with multiple external optical fibers connected with an optical fiber sensor sequentially through a guide groove and a penetrating device. The penetrating device is sleeved with a combination board with a hole formed in the middle. A hole is formed in the wall of a transformer oil tank, the combination board is welded to the hole in the wall of the transformer oil tank, and the optical fiber sensor penetrates through the combination board and the hole in the wall of the transformer oil tank to be installed at the assembly hottest point of a transformer simulation calculation coil. The alarming temperature controller is externally connected with a power source and further externally connected with a computer through RS-232 communication. The invention further relates to a thermal life monitoring method for the paper oil insulation transformer, wherein the system is adopted in the method. Loads and hotspots of the transformer can be tracked and monitored for a long time, in combination with a sampling paperboard detection result in a hotspot region, the method can be combined with other test methods to be used jointly and can be independently used, the thermal aging state of the transformer is monitored and analyzed, and meanwhile long-term operation safety, reliability and economical property of the transformer are guaranteed.

Description

technical field [0001] The invention relates to an oil-paper insulated power transformer under the conventional cooling methods ONAN (full self-cooling), ONAF (natural oil circulation air cooling), ODAF (strong oil-oriented air cooling), OWAF (strong oil-oriented water cooling), OFAF (no Oriented to strong oil air cooling) thermal life monitoring system. The present invention also relates to a thermal life monitoring method for an oil-paper insulated power transformer under conventional cooling modes ONAN, ONAF, ODAF, OWAF, and OFAF by using the system. Background technique [0002] Transformer is a very important device in the power system, and its operating status directly affects the safety of the system. It is very important for transformers to operate safely and stably during their life cycle. Usually the service life of the transformer is 20 years, but the long-term load of the transformer is different, and the life loss is also different. In order to ensure the econ...

AI Technical Summary

Problems solved by technology

Usually the service life of the transformer is 20 years, but the long-term load of the transformer is different, and the life loss is also different. In order to ensure the economy, safety and reliability of the transformer equipment, with the development of monitoring technology, real-time monitoring of hot spot temperature through optical fiber temperature measurement technology It has become a practical and mature technology, combined with the detection technology of material characteristics, it is possible to accurately judge the residual life of transformers

[0003] At present, technically, the thermal life of transformers is monitored by monitoring the average temperature rise of windings and the temperature rise of top oil, and calculating the temperature rise of hot spots of transformers through standard thermal characteristic parameters and formulas to determine the loss of thermal life. This is an indirect measurement method, and its accuracy not enough

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