Remote passive wireless temperature monitoring method for power equipment

Abstract

The invention provides an electrical equipment remote passive wireless temperature monitoring method which comprises the steps of 1, emitting a query signal to a surface acoustic wave sensor by a reader through a wide-band antenna; 2, receiving an OFC (Orthogonal Frequency Coding) signal by the surface acoustic wave sensor through a single interdigital transducer according to the trigger of the query signal and converting the OFC signal into a surface acoustic wave signal; 3, reflecting the surface acoustic wave signal by a frequency orthogonal reflecting grating chip and passing the single interdigital transducer to form an echo signal; 4, receiving the echo signal by the reader through the wide-band antenna. According to the remote multipoint connection and anti-interference surface acoustic wave wireless sensor method based on the combination of orthogonal frequency and code division multiplexing coding, the far and near effect of the code division multiplexing coding passive sensor system is solved, and the requirement of a smart power grid on the wireless monitoring of temperature of electrical equipment is met.

Description

technical field [0001] The invention relates to the field of temperature monitoring of power equipment, in particular to a remote passive wireless temperature monitoring system and method for 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 expansion or maintenance and updating of power equipment. Monitor the temperature of the stator and rotor of the generator, high-voltage switchgear, busbar...

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 piezoelectric substrate with a length of 10 mm (it is already the limit, and the propagation loss and diffraction loss of SAW will be unacceptably large if it is longer). The above sensor types

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