Combined temperature measuring system used for dry-type capacitor temperature rise test

Abstract

The invention provides a combined temperature measuring system used for a dry-type capacitor temperature rise test. A dry-type capacitor comprises a housing, a lead wire and a sleeve are arranged on one end of the housing, and the housing is internally provided with a core. The combined temperature measuring system is characterized in that the temperature measuring system comprises an optical fiber temperature-sensitive sensor and an optical fiber temperature-sensitive sensor set which are arranged in the core, and a wireless temperature measuring sensor arranged on the housing and corresponding to the optical fiber temperature-sensitive sensor and the optical fiber temperature-sensitive sensor set. Compared with the prior art, the combined temperature measuring system used for the dry-type capacitor temperature rise test has the advantages that internal and external temperature detection can be carried out on the capacitor at the same time under an electric isolation condition, the normal operation of the capacitor is ensured, and the capacitor is maintained in time relative to the temperature change.

Description

technical field [0001] The invention relates to a combined temperature measuring system, in particular to a combined temperature measuring system for dry capacitor temperature rise test. Background technique [0002] At present, oil-immersed capacitors and dry capacitors are commonly used in the high-voltage field. The latter has environmental protection, material saving, low cost, simple process, light weight and small area, self-healing products, more reliable operation, and good fire resistance. It is not easy to generate high-pressure gas, and the possibility of explosive hazards is greatly reduced. [0003] Dry capacitors are composed of capacitor cores, casings, bushings and other accessories. The capacitor core consists of capacitor elements and insulation. The capacitor element is made of a certain thickness and layers of film insulating medium and aluminum foil electrodes. There is also a metallized film formed by evaporating a layer of metal on the film. After th...

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Problems solved by technology

[0005] At present, the temperature field of dry-type capacitors generally uses a temperature sensor to measure the temperature of the capacitor shell, and then calculates the internal temperature. There is an error between the obtained temperature value and the distribution of the internal temperature field of the capacitor, and the true temperature of the highest temperature point cannot be accurately obtained.

[0006] In response to this deficiency, Xidian Group has disclosed a technology that uses a temperature sensor inside the capacitor to measure the internal temperature of the capacitor in operation, but the signal of the temperature sensor is transmitted to the external test system through the wire, and the transmission The signal will be subject to electromagnetic interference

In addition, there are few detection points, inaccurate measurement points, and the difference between the temperature measurement point and the highest temperature point is difficult to eliminate

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