| Title |
A Study on the Stable Transfer Relay Logic for 6.6kV Bus in Emergency |
| Authors |
Yeong-Sik Cho ; Won-Sik Moon ; Jae-Chul Kim |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2016.30.5.039 |
| Keywords |
Automatic Bus Transfer ; Fast Transfer ; Motor Bus Transfer(MBT) ; Residual Voltage Transfer |
| Abstract |
Recently at many industrial factories, distribution buses for critical loads are installed redundancy system. This system is divided from main Transformer to distribution buses. Generally this bus arrangement is in a incoming-tie-incoming arrangement. If the loss of the power is happened, that bus must be transferred to the alternate bus without damaging the equipment, and ideally, without interrupting the facilities process. This paper explains the conditions for fast transferring without damaging the equipment, without uncontrolled operating in emergency situations. And it describes the relay logic including these conditions and checks the duration time for transferring. The duration time is key of fast transferring without any problem. The system voltage stabilities using this transfer duration time is also included. |