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INTRODUCTION

DOES THE MV MAINS CONTAIN AUDIO FREQUENCY CONTROL SIGNALS?

Some energy supply companies use higher-frequency signals in their medium voltage mains for the transmission of control
pulses and data. These so-called “audio frequency signals” ranging typically from 160 to 1350 Hz may become absorbed or dis-
torted by, or cause resonance problems with capacitor installations. Such problems may be prevented by the selection of proper
detuning reactors.

Capacitor/PFC system audio frequency reactive power activity
non-detuned < 300 Hz Q < 35 % of S T no specific activity
C
Q > 35 % of S T consult your power supply company and conduct
C
mains analysis
> 300 Hz Q < 10 kvar no specific activity
C
Q > 10 kvar consult your power supply company and consider
C
special PFC system
detuned < 300 Hz no restrictions consult your power supply company and consider
special PFC system
300 Hz ... 420 Hz no restrictions detuning factor > 7 %
> 420 Hz no restrictions detuning factor > 5 %
chart 4

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