Optical fiber temperature sensor for measuring temperature field of transformer winding

Abstract

The invention discloses an optical fiber temperature sensor for measuring a temperature field of a transformer winding. Theoptical fiber temperature sensor comprises a sensing optical fiber, one end of the sensing optical fiber is in a free state, the other end of the sensing optical fiber is an optical fiber joint, a high-temperature-resistant protective sleeve is sleeved outside the sensing optical fiber, and uniformly distributed air slots are arranged on the surface of the high-temperature-resistant protective sleeve and are used for ensuring that air between the interior of the protective sleeve and the sensing optical fiber is exhausted when the transformer is vacuumized. The beneficial effects of the invention are that the sensing optical fiber with a single end in a free state not only can effectively eliminate optical fiber synchronous shrinkage possibly caused by shrinkage of a protective sleeve at a high temperature, but also can ensure that a temperature measurement point is not stressed, thereby avoiding temperature strain crosstalk and improving the temperature measurement precision; the high-temperature-resistant protective sleeve plays a role in protecting the internal optical fiber from being damaged by external force; the air slots ensure that no bubble remains in the whole sensor when the transformer is oiled, avoids adverse effects on the insulating property of the transformer, and ensures accurate measurement and reliable operation of a temperature field in a transformer winding.

Description

technical field [0001] The invention relates to the field of transformer monitoring, and mainly relates to an optical fiber temperature sensor used for measuring the temperature field of transformer windings. Background technique [0002] Transformer is one of the most important electrical equipment in power supply system. During the long-term operation of the equipment, it will generate heat due to excessive contact resistance caused by manufacturing, transportation, poor installation, overload and aging. If the temperature of these heating parts cannot be monitored and repaired in time, it will eventually lead to fire accidents. . [0003] At present, in the field of transformers in our country, the method of measuring the temperature of transformer windings using point-type optical fibers has gradually been recognized. This point-type temperature measurement method can only monitor the temperature of the designated position of the winding and the iron core, but cannot f...

AI Technical Summary

Problems solved by technology

This point-type temperature measurement method can only monitor the temperature of the specified position of the winding and the iron core, but cannot fully reflect the temperature of the winding and the iron core, and there is a blind spot in the monitoring of the transformer overheating fault

In addition, the existing sensor protection sleeve structure is prone to residual gas after vacuuming, and air bubbles may exist between the sleeve and the optical fiber, so it will adversely affect the insulation performance of the transformer

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