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Capacitive temperature sensing for electrical conductor

A conductor, temperature sensing technology, applied in capacitors, conductors, thermometers, etc. where the dielectric temperature changes, can solve problems such as problems in the power distribution system, and achieve the effect of reliable temperature measurement

Active Publication Date: 2017-08-18
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temperature of the cable joint or junction exceeds this value, it can indicate that there may be a problem with the power distribution system

Method used

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  • Capacitive temperature sensing for electrical conductor
  • Capacitive temperature sensing for electrical conductor
  • Capacitive temperature sensing for electrical conductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Example 1 - Temperature Sensitive Capacitor

[0107] Exemplary temperature sensitive capacitors were fabricated for sensing electrical conductors (e.g., figure 1 The temperature of the conductor 31). Temperature sensitive capacitors have as Figure 7 construction shown. The capacitor body is made of nylon-6 material. Electrodes are disposed on the outer surface of the capacitor body to form an interdigitated capacitor. The dielectric properties of temperature-sensitive capacitors were measured by using a dielectric spectrometer according to ASTM standard test methods (including ASTM D150 "Standard Test Method for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation").

[0108] Figure 8 is a graph showing the relationship between the temperature of the conductor 31 and the dielectric constant of the capacitor main body. The dielectric constants were measured at 133kHz, 94.9kHz and 67.8kHZ, respectively.

[0109] Figur...

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PUM

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Abstract

Provided is a system for directly sensing, measuring, or monitoring the temperature of an electrical conductor (31) of a power cable (10). A temperature sensitive capacitor (21C) is disposed in direct thermal contact with the electrical conductor (31). The temperature sensitive capacitor (21C) includes a dielectric material that has a dielectric constant variable with the temperature of the electrical conductor (31). The temperature of the electrical conductor (31) can be sensed, measured, or monitored by measuring the capacitance of the temperature sensitive capacitor (21C).

Description

technical field [0001] The present disclosure relates to systems for monitoring the temperature of electrical conductors, and in particular to systems for monitoring the temperature of electrical conductors enclosed in at least a (semi)conductive layer, such as electrical conductors of power cables in power distribution systems. Background technique [0002] Medium and high voltage power distribution systems play an important role in modern society. Safety and security are always important factors to the "health" of an electrical distribution system. Therefore, techniques should exist that can monitor the "health" of the distribution system. [0003] In power distribution systems, such as medium or high voltage power distribution systems, the temperature of the conductors of a cable may increase as the current carried by the cable increases. Thus, in such systems, the "health" of such systems can be assessed by monitoring the temperature of in-line electrical conductors, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/34
CPCG01K7/343H01G7/04G01K7/34G01K13/00H01B7/324H01B9/006H01B9/008
Inventor 问治国金载源贾斯汀·M·约翰逊喻学韬大卫·V·马霍尼迈克尔·D·班森克里斯多夫·D·谢科什陶姜明燦
Owner 3M INNOVATIVE PROPERTIES CO
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