Woodward easYgen-3000XT Series, Manual, Page: 270 / 1205

For this breaker logic to function correctly, the mains power measurement must be
connected properly.
The following applies for the power display:
• Positive mains power = export power •
• Negative mains power = import power
•
In the event of a start request, a change is made from mains to generator supply.
The following occurs:
• The GCB is synchronized and closed •
• The generator assumes load until the imported mains interchange real power has •
reached 5 % of the "Generator rated active power" (parameter ╚═▷ 1752 )
• The MCB is opened •
When a stop request has been issued, a change is made from generator to mains supply.
The following occurs:
• The MCB is synchronized and closed •
• The generator sheds load until real power has reached the "Unload limit" •
(parameter ╚═▷ 3125 )
• The generator power factor is controlled to "1.00" (unity) •
• The GCB is opened •
The limit for opening the MCB during softloading (Unloading mains) is +/- 5% active
generator rated power without any delay. In multiple generator applications the 5% limit
is calculated out of the current nominal generator power in the system.
Examples:
• One engine is running with 1000kW rated, the +/-5% limit is a power window at the •
interchange point from 50kW import up to 50kW export.
• One engine is running with 500kW rated and another with 300kW rated, the +/-5% •
limit is a power window at the interchange point from 40kW import up to 40kW
export.
Hint: The generator rated power is taken into account to find a good compromise
between bumpless power transfer and being not too long mains parallel.
Breaker logic "CLOSED TRANSIT."
The following only applies to application mode
A04
.
Closed transition (make-before-break/overlap synchronization) is enabled by configuring
parameter
╚═▷ 3411 to "CLOSED TRANSITION".
270 easYgen-3000XT Series B37574
4 Configuration
4.4.3.1.6 Transition Modes (Breaker Logic)
Released