利用局部照明变压器可调整——提高或降低照明线路电压。[例一]提高照明线路电压:设计某车站的牵出线照明(如照明容最为10盏100W 白炽灯弯灯),因距变压器远,至牵出线照明线路上最远一个弯灯的电压低于规定值下限:90％U_e=198V(如185V),即可采用一台局部照明变压器 B,一次绕组并联在220V 照明线路上,二次绕组正向串联在相线上,如图1。若用220/24V 变压器,则弯灯 Adjustable with local lighting transformers - Increase or decrease lighting line voltage. [Example 1] Raising the lighting line voltage: Designing a pullout line lighting at a station (eg a maximum of 10 100W incandescent lights with a lighting capacity), the voltage to the furthest one of the bends on the lighting line to the pullout line is far below the transformer The lower limit of the specified value: 90% U_e = 198V (such as 185V), you can use a local lighting transformer B, a winding parallel to the 220V lighting circuit, the secondary winding forward in series on the phase line, If 220 / 24V transformer, then bend light