A cable partial discharge detection sensor, system and method
A partial discharge detection and sensor technology, applied in information technology support systems, instruments, measuring electronics, etc., can solve the problems of partial discharge detection sensitivity and calibration value changes, and achieve the effect of compact structure and good detection effect
Active Publication Date: 2022-07-05
STATE GRID ZHEJIANG ELECTRIC POWER +1
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Problems solved by technology
Partial discharge acoustic measurement method has been widely used in the partial discharge detection of transformers, especially the optical fiber partial discharge acoustic wave sensor has been widely studied for the detection of partial discharge of transformers, but most of the current partial discharge optical fiber sensors have temperature sensitivity. In actual detection applications, the sensitivity and calibration value of partial discharge detection often change due to temperature changes.
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[0065] 1. Sensor probe structure and size
[0066] The sensor probe is mainly composed of a single-mode fiber pigtail 5, a glass sleeve 4, a temperature-sensitive glass 3, a glass base 2, and a glass diaphragm 1. The temperature-sensitive glass 3 is a sensitive glass whose refractive index changes with temperature. The fiber pigtail 5 is mainly used to guide the laser light signal used for the sensor operation, and needs to be polished to keep the end surface smooth. The end face of the fiber pigtail 5 is directly contacted with the temperature sensitive glass 3 after being collimated and fixed by the glass sleeve 4 . Above the glass base 2, a carbon dioxide laser is used to directly weld the glass diaphragm 1 and the glass base 2 to form a Fa-Per cavity 220 structure. The inner surface, that is, the lower surface, of the glass diaphragm 1 is coated with a reflective film 11 having a reflectivity of 50% for 1550 nm light. The glass base 2, the temperature-sensitive glass 3 a...
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Abstract
The invention relates to the technical field of electrical equipment, in particular to a cable partial discharge detection sensor, system and method, comprising a glass diaphragm, a glass base, a temperature-sensitive glass and a glass sleeve that are assembled against each other up and down in sequence, The lower surface is connected with a reflective film, and the upper surface of the temperature-sensitive glass is connected with a filter film. The glass base includes a glass base and a glass boss. The glass boss is formed with an up-and-down Fa-Per cavity, which is formed in the glass sleeve. There are up and down light-transmitting areas that are used for the fiber pigtail to abut against the lower surface of the temperature-sensitive glass after being inserted upwards and enable the optical fiber pigtail to guide the light upwards, which can simultaneously pass through the temperature-sensitive glass, filter film, and glass substrate. , Far-Pere cavity, reflective film and glass diaphragm optical fiber installation channel, the filter film has a reflectance of at least one light greater than 95% and at least another light reflectance of less than 10%, suitable for cable solid Insulation partial discharge signal and temperature are detected simultaneously.
Description
technical field [0001] The invention relates to the technical field of power equipment, in particular to a cable partial discharge detection sensor, system and method. Background technique [0002] Partial discharge is one of the important factors that cause insulation damage of power equipment. Detection of partial discharge is one of the effective methods to evaluate the health status of power equipment. However, there is no very effective partial discharge detection method for cross-linked polyethylene (XLPE) cables. [0003] At present, in the field of electric power industry, the detection of partial discharge of running cables mainly includes high-frequency current sensor, ground current detection or indirect detection method of temperature detection. The high-frequency current sensing method can theoretically effectively detect the pulse current signal of partial discharge, but due to the existence of electromagnetic interference, the on-site detection effect is not g...
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IPC IPC(8): G01R31/12
CPCG01R31/1272Y04S10/52
Inventor 张伟超范江东徐天天郭威李明袁骁吴昊王克平杜亮
Owner STATE GRID ZHEJIANG ELECTRIC POWER