Main Switchboard Operation Sample Clauses

Main Switchboard Operation. The main switchboard shall provide all the instrumentation, controls, and circuitry required for control and monitoring of the ship service electrical generation and distribution system. One (1) generator provides normal electrical service. The system shall have the ability to run any two (2) generators in parallel. Switchboard interlocks shall prevent the operation of three (3) generators in parallel. Each SSDG set shall have Run, Standby, and Shut Down operating modes, selectable with a switch on the switchboard. When in Standby mode each SSDG will be ready to automatically start, parallel, and assume its proportional part of the load when load reaches 90% of the capacity of the on-line generator set for 30 seconds. The standby startup load and time delay shall be 640 645 650 655 660 665 670 adjustable. Additionally, it shall automatically start, accelerate to rated speed, and connect to the bus upon main bus voltage failure within eight (8) seconds. The switchboard shall be equipped to allow manual and automatic parallel operation. In Manual Mode the generators operate with speed and voltage droop. The operator manually synchronizes and manually adjusts engine speed and generator voltage. In Automatic Mode the generators synchronize and parallel automatically, and operate isochronously with constant voltage. Primary control power for switchboards shall be derived from internal control transformers provided with appropriate overcurrent protection. Secondary control power shall be provided from DC uninterruptible power supplies (UPS), NewMar Nav-Pac or equal, as shown in Reference (3D). The switchboard automation shall provide the ability for closed (bumpless) transition between ship supply and shore power, or the reverse. The ship and shore supplies shall operate in parallel for not more than 100 milliseconds. The switchboard shall include monitoring of shore power voltage, frequency, and phase sequence. Before paralleling the ship service bus to shore power, the automatic voltage regulator shall adjust the voltage on the ship service bus to match that of the shore power connection. Switchboard interlocks shall prevent manual paralleling of the ship service bus and shore power, and shall prevent the operation of the automatic transition function when voltage is not present on both the ship service bus and shore power feed at the switchboard. Interlocks shall also prevent transitioning from generator power to shore power when the load on the ship service ...
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