ZFG—11型集成电路方向高频保护

ZFG-11 INTEGRATED-CIRCUIT TYPE CARRIER PROTECTION WITH DIRECTIONAL COMPARISON

研制适用于２２０ｋＶ～５００ｋＶ超高压输电线路的ＺＦＧ－１１型集成电路方向高频保护．该装置采用负序方向和正序距离元件作为全相运行时的方向元件，以无触点切换的相电压补偿式方向元件并辅以正序距离元件作为非全相运行时的保护．３个不同原理的方向元件可从性能上互相补充、互为备用，其整体性能优于引进的ＳＬＹＰ—ＳＬＣＮ型方向保护．

ZFG-11 integrated-circuit type carrier protection with directional comparison can be used in 270kV～500kV extrahigh voltage transmission lines. The protective device has the same advantages as foreign same products and the design of protection is based on the features and the requirements of domestic power systems. This protection uses negative sequence power relays and positive sequence distance relays as directional elements in three-phase operational condition. In addition, in two phase operational condition a phase compensator-type directional relay with electronic switching is used to respond to all kinds of faults and the positive sequence distance relay is used for auxiliary protection. Three directional elements of the differential principle complement each other in function and alternate with each other in operation. Therefore,the protection has advantages over SLYP-SLCN type of protection in whole performance.