Optical fiber sensor structure for partial discharge of transformers and demodulating method and monitoring method thereof

Abstract

The invention relates to the technical field of optical fiber sensing monitoring and diagnosis application, and especially refers to an optical fiber sensor structure for partial discharge of transformers. The optical fiber sensor structure comprises a computer, a light source module, a signal demodulation unit, an optical coupler, an optical fiber F-P acoustic sensor and a transformer. The optical coupler is connected to the light source module, the signal demodulation unit and the optical fiber F-P acoustic sensor through an optical cable. The signal demodulation unit is connected to the computer through a data line. The optical fiber F-P acoustic sensor is installed outside the transformer by a support beam type diaphragm structure. By using an optical fiber F-P acoustic sensor probe prepared by the MEMS technology, the consistency and mass production are improved. The optical fiber F-P acoustic sensor has the advantages such as small size, strong anti-electromagnetic-interference ability, wide frequency response range and high accuracy. By means of multi-point monitoring, a fault expert diagnosis and alarm device can locate the position of local discharge inside the transformerand monitor the discharge time and quantity.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing monitoring and diagnosis application, in particular to a structure of an optical fiber sensor for partial discharge of a transformer, a demodulation method of a signal demodulation unit and a monitoring method of an optical fiber sensor, and in particular to a transformer prepared based on MEMS technology. Background technique [0002] The power transformer is one of the most important electrical operation core equipment in the entire modern electric power industry system. It is the basis for ensuring the reliability of power supply. Much depends on its insulation state. Long-term studies have shown that the end of life of most transformers is due to the loss of the insulation capacity of the application, and the most important factor affecting the insulation capacity is the winding temperature during transformer operation. In addition, the main characteristic of the sudden fault of...

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Problems solved by technology

At present, the monitoring methods for partial discharge of power transformers include pulse current method and radio frequency measurement method. However, these traditional methods have many problems such as weak anti-electromagnetic interference ability, poor stability and low precision.

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