Temperature sensor for interior of oil immersed transformer and manufacturing method of temperature sensor

Abstract

The invention discloses a temperature sensor for the interior of an oil immersed transformer. The temperature sensor comprises an optical fiber, an optical fiber connector arranged at the first end of the optical fiber, a thermosensitive element packaged at the second end of the optical fiber, a first protective sleeve and a second protective sleeve. The outer periphery of the second end of the optical fiber is sleeved with the first protective sleeve, the other outer peripheries of the optical fiber are sleeved with the second protective sleeve, and the first protective sleeve is provided with multiple through holes which are through in the radial direction. The invention further discloses a manufacturing method of the temperature sensor for the interior of the oil immersed transformer. The temperature sensor is small in size, simple in structure and high in reliability, structural damage, precision reduction and other situations are avoided, the requirements that the temperature sensor is embedded into a winding or an iron core can be well met, and the temperature of the interior of the oil immersed transformer is convenient to monitor.

Description

technical field [0001] The invention relates to the technical field of power transformation equipment, in particular to a temperature sensor used in an oil-immersed transformer and a manufacturing method thereof. Background technique [0002] Transformer is one of the important equipment in the power system, and it is of great significance to ensure its safe operation. Insulation aging is the root cause of transformer life shortening, and high temperature will accelerate winding insulation aging. In order to ensure safe and reliable operation of the transformer and prolong the service life of the transformer, it is very important to monitor the hot spot temperature, core temperature and oil temperature of the transformer winding. [0003] Traditional temperature sensors cannot meet the requirements of being placed inside windings or iron cores. Existing fiber optic temperature sensors often have the following problems: [0004] (1) The packaging structure of the optical fib...

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Problems solved by technology

[0003] Traditional temperature sensors cannot meet the requirements of being placed inside windings or iron cores. Existing fiber optic temperature sensors often have the following problems:

[0004] (1) The packaging structure of the optical fiber temperature sensor used to measure the internal temperature of the oil-immersed transformer is complex and the reliability is low;

[0005] (2) Due to the desensitization effect of the existing fiber grating-based temperature sensor, there are problems such as drift and poor precision in long-term work;

[0006] (3) The structural design of the existing optical fiber temperature sensor is not compatible with the transformer manufacturing process, it is easy to be damaged during installation and use, and its reliability is low

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