AGC Designer’s Reference Handbook
DEIF A/S Page 132 of 168
8. Synchronisation
The unit can be used for synchronisation of generator and mains breaker (if installed). Two
different synchronisation principles are available, namely static and dynamic synchronisation
(dynamic is selected by default). This chapter describes the principles of the synchronisation
functions and the adjustment of them.
Dynamic synchronisation
In dynamic synchronisation the synchronising gen-set is running at a different speed than the
generator on the busbar. This speed difference is called
slip frequency. Typically, the synchronising
gen-set is running with a positive slip frequency. This means that it is running with a higher speed
than the generator on the busbar. The objective is to avoid a reverse power trip after the
synchronisation.
The dynamic principle is illustrated below.
L2
2.5 s 7.5 s5.0 s 0 s
GB
GB
Load
Synchronised
L1 L1L1L1
L1
L3
L2 L2 L2L2 L3 L3L3L3
L3
L1
L1
L2
L2
L3
L3
L1
∆t [s]
180°
90°
0°
Angle
L1
gen
/L1
bus
[deg]
Synchronising generator Generator on load
Synchronisation principle - dynamic synchronisation
1503 RPM
50.1 Hertz
Speed:
1500 RPM
50.00 Hertz
Speed:
L2
In the following the term ‘synchronisation’ means ‘synchronising and closing of
the synchronised breaker’.
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