(2) switch station (SSP) the switch

(2) switch station (SSP) the switch station of the electric traction power system is actually a switching station for power distribution. The switch station is also a high-voltage switch station, in fact, in a more strict sense, is a high-voltage switch station, only from the distribution function, to achieve ring network power supply, two-way switch function. When the power supply in the hub area is divided into "from the inside to the outside" and "from the outside to the inside" two categories, the former is located in the traction station in the hub. In order to improve the reliability of the hub area and reduce the scope of the accident, the switch station is usually set in the latter. At power supply, the arm is longer, in the middle of the configuration of power supply is also provided with opening and closing. When opening and closing, there should be different feeders of two-circuit (single-circuit) traction substations (double-circuit) which come from different traction substations. In order to reduce the cross interference caused by the length of feeder, the load should be set at the center of the hub as far as possible.