Method for measuring temperature of conductor in strong alternating electromagnetic field

Abstract

The present invention relates to a method for measuring temperature of a conductor in a strong alternating electromagnetic field based on a CAN (controller area network) bus double-layer network structure. The requirements of temperature measuring and data transmitting devices for power consumption, high voltage insolation, unlimited volume of monitoring equipment, simple and reliable installation mode, etc have to be met when the temperature of high voltage distribution equipment rises. The structure comprises three physical modules of low power consumption and two communication protocols. The physical modules are a radio temperature measuring sensor, a radio receiving master station and a monitoring center. The communication protocols are CAN and ZigBee. A multi-host and multi-slave tree-shaped double-layer network structure is accordingly formed from the content above. The first layer is a CAN bus type daisy chain configuration formed by the monitoring center and the host nodes of the second layer, which are connected by wires. Data is transmitted by CAN protocol. The second layer is a star configuration consisting of host nodes and slave nodes of the layer. The nodes are in radio connection, and data is transmitted by ZigBee protocol. The present invention is used for measuring temperature of a conductor in a strong alternating electromagnetic field.

Description

Technical field: [0001] The invention relates to a method for measuring the temperature of a conductor in a strong alternating electromagnetic field based on a CAN bus double-layer network structure. Background technique: [0002] High-voltage power transformation and distribution equipment is in a strong alternating electromagnetic field environment. The connection points of high-voltage power equipment such as high-voltage switches and high-voltage circuit breakers, the dynamic and static contacts of each knife switch, cable connectors and conductors are due to various reasons. It will generate temperature rise and bring many safety problems; due to the strong alternating electromagnetic environment, online real-time monitoring of the temperature rise of these conductors must solve the power consumption of temperature measurement and data transmission devices, high voltage isolation, limited volume of monitoring equipment, The installation method is simple and reliable. ...

AI Technical Summary

Problems solved by technology

[0006] It is a feasible method to use UWB for data transmission in a strong alternating electromagnetic environment; although UWB overcomes the problem of relatively high power consumption of Bluetooth technology, the power consumption of UWB is one-twentieth of that of Bluetooth technology, but its power consumption It is still 1.75 times that of ZigBee technology; while the transmission distance in open areas is less than ten meters, the transmission distance is limited, which hinders the application of UWB technology in strong alternating electromagnetic environments; because UWB emits ultra-wideband electromagnetic waves, it will It brings many unpredictable electromagnetic interference problems, so the application of UWB technology in high-voltage transformer distribution cabinets is not an ideal choice

The use of wireless data receivers can solve the problem of signal transmission conflicts through point-to-point time-division multiple access (TDMA) wireless communication, but because the receiving node needs to monitor the channel for a long time, it consumes a lot of energy

Therefore, TDMA still cannot independently solve the problem of temperature measurement of conductors in a strong alternating electromagnetic environment.

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