The principle is to grade the operating times of the relays in such a way that the relay closest to the fault spot operates first. The optimization of overcurrent relays' operation is a topic associated with protection coordination of distribution networks. Usually, this refers to medium-voltage networks, since they are protected by numerical relay devices, as opposed to low-voltage networks, where utility operators allocate. Abstract—Transmission line protective relays are assuring normal operation of power system by automatically isolating faulted sections. Further, the duration of the voltage. speed, sensitivity, dependability, security, and selectivity.
[pdf] Abstract—We report here on the design, fabrication and char-acterization of 48-channel parallel optical transceivers demon-strating terabit/sec data transfer rate. 5 Gb/s giving an aggregate data rate of 102 Gb/s is demonstrated, to the authors' knowledge, for the first time. The paper describes and demonstrates 13 16-mm cross-section 12-channel parallel-optic transmitter and receiver modules. In order to solve this contradiction, the industry has developed a parallel multi-channel optical module, that is, multiple laser chips are integrated into one optical module, and the overall transmission rate requirements are met by multi-channel parallel transmission.
[pdf] The principle is to grade the operating times of the relays in such a way that the relay closest to the fault spot operates first. The faster the protection operates, the smaller the resulting ha-zards, damage and the thermal stress will be. Core idea: Protective relays monitor electrical quantities and command protective devices to isolate faults or abnormal operating conditions.
[pdf] 
