Section 2 Application2.1 General IED applicationGUID-2E886C66-C954-40F8-9C0E-0BBF4A0A8A54 v3RED650 is used for the protection, control and monitoring of overhead lines andcables in solidly or impedance earthed networks. It is suitable for the protection ofheavily loaded lines and multi-terminal lines where the requirement for fast one-and/or three-phase tripping is wanted. Back-up protection and apparatus control for1 circuit breaker is included.The phase segregated current differential protection provides an excellentsensitivity for high resistive faults and gives a secure phase selection. Theavailability of six stabilized current inputs per phase allows use on multi-breakerarrangements in two or three terminal applications. The communication betweenthe IEDs involved in the differential scheme is based on the IEEE C37.94 standardand can be made redundant for improved reliability. Charging currentcompensation allows high sensitivity, even on long overhead lines and cables.The full scheme distance protection provides protection of power lines with highsensitivity and low requirements on remote end communication. The 6 zones havefully independent measuring and setting ranges which gives high flexibility for alltypes of lines. Load encroachment and adaptive reach compensation are included.The multi-shot autoreclose includes priority features for double-breakerarrangements. It co-operates with the synchrocheck function with high-speed ordelayed reclosing.Breaker failure, high set instantaneous phase and earth overcurrent, four stepdirectional or non-directional delayed phase and earth overcurrent and two stepundervoltage protection are included and configured as back-up protection.The impedance protection and the directional overcurrent protection cancommunicate with a remote end in any teleprotection communication scheme. Theadvanced logic capability, where the user logic is prepared with a graphical tool,allows special applications. Communication for teleprotection schemes can berealized over the differential protection communication link.The IED can be used in applications with the IEC 61850-9-2LE process bus withup to four Merging Units (MU). Each MU has eight analogue channels, fourcurrent and four voltages. Conventional input transformer module and MergingUnit channels can be mixed freely in your application.The power swing detection function is used to detect power swings and initiateblock of all distance protection zones. The occurrence of earth-fault currents duringa power swing inhibits the function to allow fault clearance. A complementary1MRK 505 393-UEN B Section 2ApplicationLine differential protection RED650 2.2 IEC 27Application manual
