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    • 8. 发明授权
    • Protective relay and method for controlling the same
    • 保护继电器及其控制方法
    • US08908780B2
    • 2014-12-09
    • US13126958
    • 2009-03-25
    • Atsushi TakeuchiMasanori Shimada
    • Atsushi TakeuchiMasanori Shimada
    • H04B3/00H02H3/30H04B3/30
    • H02H3/30H04B3/30
    • According to one embodiment, a protective relay performs the following steps. A/D converter 11 acquires an electric current of a power transmission line 4 via a CT 5. A computing part 12 performs various protection computations such as current differential computation using a current data measured at the end of itself and a current data measured at the opposite end. A transmitting and receiving circuit 13 transmits the current data of itself to the other protective relay 1 at the opposite end via a transmission path 3. A received level detection part 14 detects the received level of the transmission data that has been transmitted from the opposite end and received by the transmitting and receiving circuit 13. A transmission level control part 15, based on the difference between the received level that has been detected within a definite time t1 after the establishment of data transmission to the other protective relay 1 and a predetermined received level, performs transmission level reduction control after the passage of the definite time t1.
    • 根据一个实施例,保护继电器执行以下步骤。 A / D转换器11经由CT5获取电力传输线路4的电流。计算部分12执行各种保护计算,例如使用在其自身端部测量的当前数据的当前差分计算和在 对面 发送和接收电路13经由传输路径3将其自身的当前数据发送到相对端的另一保护继电器1.接收电平检测部分14检测从相对端发送的发送数据的接收电平 并且由发送和接收电路13接收。发送电平控制部分15基于在向另一个保护中继1建立数据传输之后的确定时间t1内检测到的接收电平之间的差和预定的接收 在定时t1之后进行传输电平降低控制。