Control System Research On Wireless Temperature Detecting In High-Voltage Transformer Substation

Due mainly to electrical overload and equipment aging problems, fire and explosion occur at transmission circuitry joints in high-voltage transformer substations by high temperatures accumulated at these spots. This is frequently accompanied by huge financial loss to power suppliers and customers. Hence real-time temperature detecting and prewarning in substations becomes hot and difficult object in electrical system. At present, the traditional methods to monitor the temperatures in transformer substations is that staff members hold infrared temperature rifles to examine the temperature point by point. This kind of work pattern has a lot of drawbacks, such as missing and misdeclaration. What's more, the high-voltage and intense radiation will damage the body of the workmen. Distributed optical cable temperature detecting system is another method to monitor the abnormal situation of the substations. However, the existing problems can't be ignored either. For example, the wiring is complicated, the circuit aging problem is serious, the circuit dismantle is difficult and it is expensive. While wireless thermometric working way is possible to prevent from cut, destroy. It needs not wiring and the project is simple, easy to management and maintain.The main research contents of this thesis are listed here:1) For the first time, double power management technique and work pattern switching of chips are applied to realize ultra-low power consumption of the wireless temperature detecting spots.In this paper, intelligent temperature sensor DS18B20, ultra-low power consumption chip MSP430 and intelligent digital transforming module CC1020 are applied to exploit low power consumption, quality performance wireless temperature detecting spots. In view of the working circuit of the chip, sensor and peripheral units are small, they are current supplied by MAX1726; in view of the data sending and receiving circuits of CC1020 are large, it is supplied by MAX8881. At the same time, the dead zone units of the spots are power cut through binding a port the the chip with the control pins of the slugs to reduce the power consumption of the spots.2) For the first time, point to multi-point polling mode is applied to realize wireless temperature detecting in substations.The host computer in control room utilizes polling mode to monitor the temperatures of the spots, i.e. turning point to multi-point mode into time-division multiple address (TDMA) wireless communication mode. The host enquires each spot according to predefined time slice, then it wait to receive data from the enquired spot and memorize them to data base. When this work finishes, another spot serial number is broadcasted, and so on. The spot initiates to detect temperature according to predefined periodic time. If the temperature measured is higher than the stated threshold, the spot opens receiving module to wait for the enquiring message from host so as to send temperature data. Subsequently, this spot closes CPU into low power consumption state. As for the spots which temperatures approach the stated threshold, the time interval of detecting temperatures is shortened so as to find accidents in time.(3)For the first time, the electromagnetic compatibility(EMC) of wireless thermoscope in high-voltage is studied.On the one hand, the influences of wireless thermoscope to high-voltage equipments are studied to enhance the anti-jamming ability of wireless thermoscope such as installing filter or shield equipment. On the other hand, disturbs of wireless temperaturing detecting system to integrate automatic manage system in substations are studied so as to dominate the disturbs of wireless communication into the range of electric equipments.