A wireless temperature sensor and a wireless temperature measuring device including the sensor

Abstract

The invention discloses a wireless temperature sensor and a wireless temperature measuring device containing the sensor, including a receiving node, a wireless gateway / base station, and a wireless temperature sensor. The probe and the temperature measuring probe shell, the internal circuit board of the electronic warehouse, the circuit board is integrated with a data acquisition system, a data processing system and a data sending and receiving system, the data receiving and receiving system is equipped with an antenna, and the wireless temperature sensor senses the temperature of the cable through the temperature measuring probe , through the data acquisition system and data processing system into electrical signals, and then transmit electrical signals to the receiving node through the antenna of the data receiving and transmitting system, which improves the accuracy and reliability of cable temperature monitoring and is suitable for monitoring in various environments.

Description

technical field [0001] The invention relates to a wireless temperature sensor and a wireless temperature measuring device including the sensor. Background technique [0002] In the power industry, due to the aging of materials and other reasons, it will cause problems such as excessive local resistance or partial discharge, which will cause the temperature of the faulty part to rise, cause the aging of cables or connectors to accelerate, and cause fires in severe cases; at the same time, for the beauty of the city, gradually Aerial cables are laid underground, making troubleshooting more difficult, especially in coastal cities where the groundwater level is high and cables are almost submerged in water, making troubleshooting even more difficult. The general cable fault precursor is abnormal temperature, so the monitoring of cable temperature becomes very critical. [0003] The existing methods of monitoring the temperature of cables are generally using infrared thermometer...

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Problems solved by technology

[0003] The existing methods of monitoring the temperature of cables are generally using infrared thermometers, optical fiber communication temperature measurement, wireless temperature measurement and other methods. Since the cable may be almost soaked in water, the penetration of infrared rays in water is extremely low, so the use of Infrared temperature measurement is only suitable for overhead cables, but it is helpless for cables laid underground; for optical fiber communication temperature measurement, because the temperature measurement nodes are too large, the number of optical fibers is also required, and the length of optical fibers is also very long. The reliability of the optical fiber itself It is also difficult to guarantee the reliability, so the optical fiber communication temperature measurement method is only suitable for occasions where there are not many temperature measurement points and the distribution is concentrated. However, the urban power supply cable has the characteristics of wide distribution and many temperature measurement points. Obviously, the optical fiber communication temperature measurement method has great advantages For the limitation of wireless temperature measurement, there are relatively mature applications for switch cabinet temperature measurement and overhead cable temperature measurement. Generally, the temperature sensor is arranged at the joint, and the temperature signal is converted into an electrical signal, and then transmitted to the upper position through a certain frequency. computer, the host computer then transmits the temperature signal to the control terminal for temperature monitoring

The above-mentioned wireless temperature measuring device is difficult to use in underground cables, mainly because underground cables may be immersed in water, and the water depth may reach about 2m. Radio waves attenuate greatly in water, which puts forward higher requirements for wireless signal transmission capabilities.

Even if it is an overhead cable, because it is installed in the field, the transmission distance between the sensor and the receiving node is required to be relatively large, which puts forward higher requirements for the wireless signal transmission capability; at the same time, the three phases of the cable are intertwined in many occasions. The way of electricity is not applicable, and it is also necessary to consider the use of battery power supply, and the battery power supply must consider the problem of low power consumption

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