Basler Electric DECS-250N - Manual (Page 34)

18 9440500990 Rev D
Synchronizer DECS-250N
this percentage. This setting also appears on the Voltage Matching screen, below. When the value is
changed, it is reflected in both places.
Angle Compensation
An angle compensation K setting is provided to offset phase shift caused by transformers in the system.
The angle compensation value is added only to the bus angle. For example, it is given that the generator
and bus are synchronized but the DECS-250N metered slip angle reads –30°. Equation 1, below,
illustrates the DECS-250N slip angle calculation. This means that the generator angle is lagging behind
the bus angle by 30° due to transformer phase shift. To compensate for this phase shift, the angle
compensation setting should contain a value of 330°. This value is added to the metered bus angle
resulting in an adjusted slip angle of zero degrees. Only the metered bus angle is affected by the angle
compensation setting, the metered generator angle is not biased by the DECS-250N.
𝐺 − (𝐵 + 𝐴) = 𝑆𝑙𝑖𝑝 𝐴𝑛𝑔𝑙𝑒
Equation 1. DECS-250N Metered Slip Angle
Where:
G = metered generator angle
B = metered bus angle
A = angle compensation value
Failure of Synchronization
Generator synchronization is aborted if generator synchronization fails to occur within a timeframe L
established by the user.
BESTCOMSPlus
® generator synchronization settings are illustrated in Figure 10.
Figure 10. Generator Synchronizer Settings
A Sync Type: Select Anticipatory or Phase Lock Loop.
B Slip Frequency: Adjustable from 0.1 to 0.5 Hz in 0.05 Hz increments.
C Min Slip Control Limit: Adjustable from 0.1 to 2.0 Hz in 0.1 Hz increments.
D Max Slip Control Limit: Adjustable from 0.1 to 2.0 Hz in 0.1 Hz increments.
E Fgen>Fbus: Select Enable or Disable.
F Breaker Closing Angle: Adjustable from 3 to 20
° in 0.5° increments.
G Sync Activation Delay: Adjustable from 0.1 to 0.8 s in 0.1 s increments.
H Voltage Window: Adjustable from 2 to 15% in 0.5% increments.
I Vgen>Vbus: Select Enable or Disable.
J Gen to Bus PT Match Level: Adjustable from 0 to 700% in 0.1% increments.