A Comprehensive Protection Unit Development For Under Mine Power Switch

The unique environment of coal mines under well and ground , as space limited , the humid air, load fluctuations, the electrical equipment and electrical wiring insulation is prone to aging, thereby causes earth leakage, short circuit, overload, phase failure, over-voltage, under-voltage and so on. If not promptly discovered and disposed of in time, will result in serious accidents. Endangering the personal safety and product safety [6].With the development and application of digital integrated circuits, in order to meet the evolving needs of electrical industry, distribution equipment and control systems become increasingly complex, comprehensive protection for intelligent devices and structure of the product's performance put a higher demand. At the same time, high-performance microcontroller RAM, digital signal processing DSP chip continues to emerge, the use of DSP chips as the core of the various coal Smart Protector device gradually applied to the scene.Based on analysis the Progress and Status of current domestic Power feeder switch protector, we design a new kind of intelligent feeder switch comprehensive motor protector.The text carries on the 32 bits digital signal processing processor TMS320F2812 of Texa Instrument Company to the core of signal acquisition and processing. A new intelligent protective unit provided with protection, control, measuring, display, setting, self-diagnosis and communication function and so on has been developed. The device also has protective steps of leakage locking, short-circuit, and overload, phase-failure, under-voltage, and over-voltage and so on. And it also could display operation and fault complexion using liquid crystal display and it also could have the system for inquiring about fault and communication. Software programming has used modularization configuration for upgrading easily. Furthermore, in allusion to various disturbances that the system may face, this paper puts up the anti-jamming design in two aspects of hardware and software. Finally,it has been proved by the results of tests in the laboratory that the protector can detect all the faults exactly, reliably and quickly, and execute the corresponding protection; each index meets the design requirements. At the same time, the friendly human-computer can save the time to identify the types of fault and get rid of the fault,which may improve the production efficiency.