The Safty Management Of Dual Power Supply Systems In New Coal Mine

As the methods and technologies of mining coal are gradually developed towards to the direction of high-yield, high efficiency, high security and high reliability, the equipments and production control systems are more intelligent, and the degree of mechanization is increasing, power quality requirements are rising. At the same time to curb coal mine gas, roof and water damage and other accidents, continuous and reliable power support is required. Therefore, how to protect the continued and reliable supply of electricity is an important task for electric utilities and coal companies. In this paper, based on previous studies, and combined with the actual mining situation in the city of Wuhai, how to provide reliable power for mine is described.To ensure the reliability of electricity supply, coal generally use the dual power supply, equipped with appropriate protection equipment and dual power supply automatic switching devices. Combined with the actual mining electricity situation of Wuhai, this paper establishes relay protection device and automatic stand-by power switching device models. Now most of the coals have some problems, such as the power supply is unreasonable, relay protection setting problems, harmonic serious pollution, the corresponding solution is proposed. Finally, the prospect of computer integrated protection device used into the coal mine is analyzed. This paper aims to make some contributions to coal supply security.