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在平行线路,环形线路或更复杂的多电源电网中,由于某点短路,线路的首端、终端都可能成为电源向短路点供电。因此,在该电网中输电线路的首端和终端均应装设保护;但在单侧电源放射电网中,某点短路时,只从线路的首端向短路点供电。因此,在该类电网中输电线路的保护,一般情况下只在其首端装设就可以了.这是输电线路保护装设基本原则之一。此原则对放射输电线路尤为重要,因为它既能满足安全技术方面的要求,又减少经济方面的投资和损失,对煤矿有其特殊重要意义。尤其是对煤矿6kV输电线路的保护装设更是如此。这是因为:1)煤矿6kV输电线路约有90％是属单侧电源放射类型的(其余的一般为单侧电源平行或环形线路)。2)煤矿6kV输电线路采用的保护
In a parallel line, a toroidal line or a more complex multi-supply network, the head and the head of the line may become the power supply to the short-circuit point due to some short circuit. Therefore, the transmission line at the beginning and end of the power grid should be installed with protection; but in a single-side power radiated power grid, a certain point of short circuit, only from the first line of the line to the short-circuit point power supply. Therefore, in this type of power transmission line protection, under normal circumstances, only installed at the head of it.It is one of the basic principles of transmission line protection installation. This principle is particularly important for radiotelegraphy transmission lines because it meets the requirements of safety technology and reduces economic investment and losses. It has special significance for coal mines. Especially for the protection of coal mine 6kV transmission line installation is even more so. This is because: 1) About 90% of 6kV transmission lines in coal mines are of the unilateral power emission type (the rest are generally single-sided power parallel or circular lines). 2) 6kV transmission line used in coal mine protection