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SIVACON S8 Planning Principles – Reactive power compensation
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Compensation modules
Dependent on the consumer type, non-choked and choked
capacitor modules are used for reactive power compensa-
tion. A module with fuse switch-disconnectors can option-
ally be installed to disconnect the capacitor modules (Fig.
7/2) from the main busbar.
• Non-choked capacitor modules
Non-choked modules are mainly used for central compen-
sation of reactive power with mainly linear consumers.
They are divided into several, separately switchable
capacitor modules. The reactive power controller installed
in the door enables adhering to the specified set cos j
even under varying load conditions.
• Choked capacitor modules
Choked modules have an additional inductance. They are
used for compensating reactive power in networks with
non-linear loads (15 - 20 % of the total load) and a high
harmonic component. In addition to capacitive reactive
power, choked modules also provide filtering of low-fre-
quency harmonics.
Audio frequency ripple control systems and
compensation
Ripple control signals can be used in the power supply
network to control power consumers remotely. The signals
for audio frequency ripple control systems (AF) are in the
range of 110 and 2,000 Hz. The dependency of the choking
level from the audio frequency suppressor is listed in
Tab. 7/2.
Using an audio frequency suppressor is required to prevent
suppressing ripple control signals from the network. The
audio frequency suppressor depends on the frequency of
the ripple control signal of the respective network operator
and must be adjusted if required. Special variants are
available on request.
Choking rate Audio frequency suppressor
5.67 % > 350 Hz
7 % > 250 Hz
14 % > 160 Hz
Tab. 7/2: Choked capacitor modules with built-in audio frequency
suppressor
Fig. 7/2: Capacitor modules for reactive power compensation
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