![]() ![]() The DUTT scheme’s simplified operating principle is presented in Fig. Direct Under-Reaching Transfer Trip (DUTT) ![]() The use of tripping signals is then more preferred. As regards dedicated (separate) transmission media, such as fibre optic or microwave links, and SDH wide-area networks, a failure or disruption of the power element usually does not affect the data transfer between protection devices. This is justified by such links’ exposure to interference that may impede or preclude the transfer of tripping signals, and in extreme cases – even lead to unnecessary tripping. for high-frequency PLC (Power Line Carrier) links. Blocking/unblocking automation is preferred where the transmission medium is an integral part of the protected line section, e.g. The choice of coordination scheme should depend on the level of integration between the data communications link and relevant power system devices. Directional Comparison Unblocking (DCUB). ![]()
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