Sensor and its system for long-distance passive wireless temperature monitoring of power equipment

Abstract

The invention provides a sensor for use in long-distance passive wireless temperature monitoring of power equipment. The sensor comprises a one-way interdigital transducer and a frequency orthogonal reflecting grating chip group, wherein the frequency orthogonal reflecting grating chip group comprises n chips which are arranged in sequence and construct a sensor code; each chip consists of a periodic electrode, thereby forming reflection of one orthogonal sub-frequency; sub-frequencies formed among the chips are orthogonal; the time domain length of each chip reflected signal keeps consistent, and the orthogonality condition is satisfied. The invention further provides a corresponding system. By adopting a long-distance multi-point-connection and anti-interference sound surface wave wireless sensor method, the 'near-far effect' of a code division multiplexing coding passive sensor system is eliminated, and requirement of a smart power grid on wireless monitoring of the temperature of power equipment can be met.

Description

technical field [0001] The invention relates to the field of temperature monitoring of power equipment, in particular to a sensor and a system for long-distance passive wireless temperature monitoring of power equipment. Background technique [0002] Among the many monitoring quantities of power equipment status monitoring, temperature is one of the most critical detection quantities. Through temperature monitoring, the operating status and fault information of power equipment can be understood in a timely and accurate manner. Monitoring the operating temperature of power equipment, such as the oil temperature of transformers, and the conductor temperature of transmission lines (overhead lines and power cables) can be used to calculate the load limit capacity and equipment aging degree, thereby providing a basis for dynamic capacity increase or maintenance of power equipment. Monitor the temperature of the stator and rotor of the generator, high-voltage switchgear, busbar j...

AI Technical Summary

Problems solved by technology

[0005] However, the currently developed SAW wireless sensor array cannot fully meet the temperature monitoring requirements in smart grid and UHV applications, and the problems mainly include:

[0006] Problem 1: The working distance is not enough

[0007] Problem 2: The number of temperature points detected at the same time is not enough

[0008] Question 3: The anti-interference performance of the sensor needs to be improved

However, due to the limitation of the applicable wireless bandwidth and the length of the SAW substrate material, it is difficult to realize 8 types of piezoelectric substrates on a 10 mm long piezoelectric substrate (which is the limit, and the SAW propagation loss and diffraction loss will be unacceptably large any longer). The above sensor types

Images