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ZKH-2A是电气化铁路接触网馈线的主保护,它包括电流速断、阻抗一段、阻抗二段、一次重合闸、控制回路和故障探测装置的起动回路。电流元件可消除距离保护的死区。一、二段阻抗元件具有四边形特性的方向阻抗元件,它们的线路阻抗和负荷阻抗是分别整定的,具有保护距离长,灵敏度高。躲开重负荷的能力强,躲过渡电阻能力强的特点,它的四边形在第一象限因而不需装断线闭锁元件。重合闸元件使保护装置实现自动重合,并对阻抗二段发出后加速信号,当重合于永久故障或手动合闸于故障线路时,使二段元件加速动作。各保护元件动作的同时也起动
ZKH-2A is the main protection for feeder line contact of electrified railway. It includes the starting current loop, impedance section, impedance section, primary reclosure, control loop and fault detection device. Current elements eliminate the dead zone for distance protection. First and second impedance components have quadrilateral characteristics of the directional impedance components, their line impedance and load impedance are set separately, with a long protection distance, high sensitivity. Strong ability to escape heavy loads, avoid transition resistance strong ability, it’s quadrilateral in the first quadrant so there is no need to install a broken line locking element. The reclosing component enables the protection device to automatically reclose and accelerate the signal after the second section of the impedance is issued. When the reclosing component coincides with the permanent fault or the manual closing is performed on the faulty line, the second-stage component accelerates. Each protective element is also activated at the same time