Comprehensive device of long distance (0-2000m) lighting and signal

摘要

In 1992 Jiaozuo Institute of Technology began to researhc a new kind of comprehensive device of 127V long distance lighting and signal in underground mine. In order to solve the problem that short - circuit protection distance can not exceed 500m of the old- fashioned product (Type - 4 kVA). The seriousness of the problem is that the place of exceed 500m will lost short - circuit protection in underground mine lighting line circuit of daylight lamp in 1 km and more.