Passive temperature measuring sensor of substation primary equipment

A technology for primary equipment and temperature measurement, applied in thermometers, measuring heat, measuring devices, etc., can solve the problems of difficult to adapt to the strong magnetic field of the substation, the working environment of strong interference, the high power consumption of the chip, and the inconvenience of use, so as to improve the inspection Efficiency, strong applicability and low cost effect

Active Publication Date: 2015-04-15
CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
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Problems solved by technology

The general design is to install the temperature sensor at the position where the temperature rise of the equipment may occur, and transmit the signal through the connection between the passive sensor and the temperature sensor, which is bulky and inconvenient to use
The ideal solution is to embed the tempera

Method used

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  • Passive temperature measuring sensor of substation primary equipment
  • Passive temperature measuring sensor of substation primary equipment

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Embodiment 1）

[0015] See figure 1 , the substation primary equipment passive temperature measurement sensor of this embodiment is mainly composed of a radio frequency receiving circuit, a temperature sensing circuit, a digital logic circuit and a memory.

[0016] The radio frequency receiving circuit is mainly composed of a coupling element, a rectifying circuit, a voltage stabilizing circuit and a modulation and demodulation circuit. On the one hand, the coupling element is used to couple with the electromagnetic field to obtain magnetic energy, and on the other hand, it is used to receive and send radio frequency electromagnetic wave signals of corresponding frequencies. The rectifier circuit is used to convert the alternating magnetic energy transferred by the coupling element into a DC voltage. The voltage stabilizing circuit is used to stabilize the voltage output by the rectifying circuit and then output the working power of the sensor. The modulation and demodulation circuit is use...

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Abstract

The invention provides a passive temperature measuring sensor of substation primary equipment. The passive temperature measuring sensor comprises a radio frequency receiving circuit, a temperature sensing circuit, a digital logic circuit and a storage unit. The radio frequency receiving circuit comprises a coupling element, a rectifying circuit, a voltage stabilizing circuit and a modulation and demodulation circuit. The temperature sensing circuit comprises a capacitance temperature measuring circuit and an analog-digital converter. The digital logic circuit comprises a coder/decoder and a logic controller which is in bidirectional signal electric-connection with the coder/decoder. The radio frequency receiving circuit responds to excitation signals in the frequency same as or approximate to inherent frequency of the coupling element and selectively senses the temperature of detected equipment by means of frequency of surface acoustic wave coupling element. The capacitance temperature measuring circuit measures capacitance-temperature characteristics, maps the relation of capacitance and temperature, and outputs signals corresponding to the temperature according to the capacitance bridge theory. The passive temperature measuring sensor adopting the passive temperature measurement technology is high in interference resistance and applicability, high in integrity, convenient in implement and low in cost.

Description

technical field [0001] The invention relates to the technical field of temperature detection of primary equipment in substations, in particular to a passive temperature measurement sensor suitable for temperature measurement of primary equipment in substations. Background technique [0002] There are more than 500 primary equipment temperature monitoring points in each substation. If manual inspection is performed according to the specified inspection cycle, the amount of inspection and recorded data will be huge. The existing temperature measurement technology cannot meet the requirements of daily inspection. At present, the temperature measurement methods of primary equipment in substations mainly include temperature test wax sheet method, temperature display record label method, infrared temperature measurement method or far infrared camera temperature measurement, optical fiber temperature measurement method, etc. In the temperature test wax chip method, when the tempera...

Claims

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Application Information

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IPC IPC(8): G01K7/34
Inventor 虞坚阳褚国伟范忠杜思思
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER
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