b'FOGHORN FOCUSNext Steps in ELECTRIC PROPULSIONPART TWOJUDY CUSHMAN DuBOSE, ADAM JOST, AND ED BORGEAUTHRUSTMASTER OF TEXASI n the October issue of FOGHORN, PVA member Thrustmaster ofside movable electrical connector to be directly in line with a connector Texas discussed complete electric propulsion systems which allow afi xed on the vessel The ASCS control computer will move the connector ferry to transit back and forth between terminals and islands usinginsynchronywiththevesselmotionsandconnecttheconnector energy stored in propulsion batteries. As a result, the vessel will notautomatically when the movement of the vessel and the ASCS connector emit greenhouse gases and the energy for theare synchronized within a fi xed and programmable ferry will come from an efficient, electrical- window. After the connection is made it will be generating source provided by a shore-basedThe automatedlockedandtheASCSwillmaintainaconstant utility.Thismonth,moredetailissharedtension on the connection and continuously map about the system including connecting fromconnection willand record the location of the connector. As the vessel to shore, main power charging transfer,allow the vesselvessel moves the ASCS arm will be moved by the charging the vessel batteries, and more. vessel and continue to maintain a defi ned tension crew to initiateon the connector system. This way the electrical CONNECTING FROM VESSEL TO SHORE the engagementconnectioniscreatedandmaintainedbetweenxed, The design proposed includes the use of anthe fi shore-based equipment and the moving articulatedconnectionsystemthatallowsof the chargingvessel.Whilethevesselismovingwithinthe the electrical connection to be created whiledefi ned window the connection will be maintained the movement of the vessel is extreme. Theconnection withoutcontinuously. If the vessel movement is such that variationsinvessellocationbroughtonbyinterfering withthe connection is outside the defi ned window, the the environment, ocean currents and transferASCSwillautomaticallysignaltheshorepower ofvehiclestoandfromtheferry,willnotother operationsequipment and the vessel power equipment to shut interferewithengaging,maintaining,oron the vessel. down and immediately disconnect the connector. disengaging the electrical connection betweenBoth the SES and the VES are equipped to shut the ferry and the shore-based power facility. down in milliseconds after receiving a signal. The disconnect function due to physical limitations of the connection system The hardware of the shore-to-ship power transfer connection systemis autonomous inside the ASCS controller.includes a shore-mounted, fi structure with articulating arm suchxed thatthelocationofthephysicalconnectorcanbeshiftedinthreeThe command to make the connection and break the connection can be dimensionalspacethroughadefi nedandprogrammablewindow.made from the wheelhouse or from the shore-side control equipment. The position of the connector and the associated components in theThe equipment can also be set up so this connection and disconnection is connection arm are controlled by motors and actuators. The motors andan automated function where it can be engaged and disengaged without actuators are controlled by an ASCS computer system that is dedicatedbeing manually commanded to do so. However, the engagement and to this function. The ASCS control computer monitors sensors on thedisengagement of the connection requires a manual command. (Except arm itself and sensors on the vessel to automatically position the shore- in the instances where an emergency disengagement is required) FOGHORN FOCUS: CUSTOMER SERVICE 12 FOGHORN'