Synchronisation; Dynamic Synchronisation - Deif Multi-line 2 Designers Reference Handbook

AGC
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.
In the following the term 'synchronisation' means 'synchronising and closing of
the synchronised breaker'.
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.
Synchronisation principle - dynamic synchronisation
Speed:
1503 RPM
50.1 Hertz
Synchronising generator
L2
L2
L1
L3
Angle
L1 /L1
gen bus
[deg]
180°
90°
0°
0 s
DEIF A/S
8. Synchronisation

Dynamic synchronisation

GB
L3 L1
L3
L1
L3
L1
L2
2.5 s 5.0 s 7.5 s
Load
GB
Generator on load
L1 L1
L3 L2 L3 L2
L2
Synchronised
∆t [s]
Designer's Reference Handbook
Speed:
1500 RPM
50.00 Hertz
L1 L1
L3 L2 L3 L2
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