A wireless detection method and device for bus joint contact resistance

Abstract

The invention discloses a wireless detection method and device for contact resistance of a busbar joint. A busbar penetrates a groove opening formed by an upper iron core and a lower iron core in a combined and surrounding mode, a flow and temperature measurement module is buckled on the surface of the busbar joint in a surrounding mode, a temperature sensor is directly contacted with the busbar joint and is connected with the flow and temperature measurement module, the highest surface temperature and the lowest surface temperature of the busbar joint are simulated through a finite element analysis method, the highest temperature and the lowest temperature are selected as BP neural network input variables, the contact resistance of the busbar serves as an output variable, and BP neural network training is finished. Alternating current is generated in a coil when current passes through the busbar, power supply by taking energy or current collection is selected through a selector switch, the temperature sensor detects the highest temperature and the lowest temperature of the surface of the busbar joint, current and temperature digital signals pass through an MCU processing unit and are sent to an upper computer through a wireless communication module, and the upper computer inputs the current and temperature digital signals into a BP neural network to realize the measurement of the contact resistance. The wireless detection method and device for the contact resistance of the busbar joint effectively resolve the problem that the contact resistance of the busbar in the operation process is difficult to measure.

Description

technical field [0001] The invention relates to the field of electric power technology and wireless transmission, in particular to a method and device for wireless detection of contact resistance of busbar joints. Background technique [0002] Closed busbar is an important part of power transmission equipment. In recent years, closed busbar has been widely used in indoor substations, high-rise buildings and factory buildings to replace traditional cables for power distribution. Due to the characteristics of the closed busbar's own structure, the temperature rise has a great influence on its working performance and reliability, especially the closed busbar joints. The closed busbar joints are mainly connected by bolts. At the fixed connection of screw compression, if the bolts are not tightened, or even if they are tightened, the creep of the conductor will be caused by thermal expansion and contraction after long-term operation, and the bolts will also be loosened. Oxidatio...

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Problems solved by technology

[0003] The patent literature with the Chinese patent application number 201210289446.1 discloses a contact resistance detection method and system for GIS busbar joints, which adopts the principle of contact resistance generation, and determines the contact resistance of GIS busbar joints through the pressure of the contact surface. This method It can only be measured manually, and real-time online detection cannot be realized. Moreover, the value of contact resistance is generally small, and the direct measurement error through the pressure of the contact surface is very large.

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