With the fast development of modernization construction , it is weaker and weaker for social different fileds to bear the ability to have a power failure , having put forward higher request to the distribution network and power - supply unit 隨著國家現(xiàn)代化建設的發(fā)展,社會各方面承受停電的能力越來越弱,對配電網(wǎng)和供電設備提出了更高的要求。