The ring network cabinet is a standard three outlet cabinet, that is, a four unit ring network structure. The standard monitoring device monitors the temperature No. 13 and 12, and monitors the temperature rise at the connection of each phase bus and the actual temperature of the cabinet. The number of roads for temperature measurement can be increased according to the configuration of the ring network cabinet. Meet the needs of different users.
The temperature measuring unit sends the collected temperature data to the receiving unit through infrared communication, and the receiving unit sends the data to the main control computer through RS485 communication, so that the monitoring personnel are not on site. The temperature monitoring of the entire ring network cabinet system can only be completed by the master computer, which can timely discover the possible conditions of the cabinet body, send alarms, predict accidents, and greatly improve the reliability of power supply.
The digital temperature sensor has a temperature measurement range of - 55~+125 ° c and a power supply range of 3.0~5.5 v. It uses a unique single line interface. When connected with the microprocessor, only one line is needed to achieve two-way communication between the microprocessor and the ds18b20. When used, it does not require peripheral equipment, has low power consumption and strong anti-interference capability. Therefore, the 18b20 sensor meets the requirements based on the temperature requirements and economic considerations of the ring network cabinet.
The digital temperature sensor of the lower temperature measuring machine selects channels through the numerical control analog switch MUX, which is very convenient for on-site installation and confirmation of each channel. The temperature is collected every 10s to obtain the temperature value of each channel, and then sent to the upper computer through infrared communication. In this way, when the temperature value of any phase bus is abnormal, an alarm can be given.
The temperature control sensor is mainly cast and packaged with epoxy resin, which is an excellent insulating structural material with high dielectric property, arc resistance and surface leakage resistance. The sensor is coated with industrial grade high thermal conductivity insulating silicone grease, which can make its 1mm thick silicone grease withstand 20kV breakdown resistance voltage signal strength, and has a good thermal conductivity, Meet the requirements for online environmental monitoring of bus temperature rise. The sensor system adopts the position that the problem is very close to the bus connection, which can affect the very economic and fast sensing of the changing temperature of the bus connection.
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By repeatedly collecting data and eliminating abnormal data, the reliability of data can be guaranteed. Based on the design of the temperature measuring machine module, sensor installation, infrared communication mode and power supply design, the temperature measuring system has good anti-interference capability and stable and reliable measurement data.
