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目前,小水电站低压机组的中性点一般与主变中性点连接后接地,这种结线方式会出现很大的中性线电流.例如高州县周洞电站(2×400千瓦,联大电网运行,主结线见图1A),出现烧断中性线的故障.船步头电站(2×250千瓦,联大电网运行,主结线见图1B)中性线出现大电流,多次烧断中性线,导致机组不能运行,当切除中性线(不接地,不与主变连接)后,运行正常.笔者
At present, the neutral point of low-voltage unit of a small hydropower station is generally grounded after being connected with the neutral point of the main transformer, and a great neutral current may appear in such a junction mode, for example, Zhouzhou Power Station of Gaozhou County (2 × 400 kW, Power grid operation, the main junction line shown in Figure 1A), appear the fault of the neutral line.BuBuTou power station (2 × 250 kW, the main power line operation, the main line see Figure 1B) Burn the neutral line times, leading to the unit can not run, when the removal of the neutral (ungrounded, not connected with the main transformer), the operation is normal.