Audio Frequency Suppressors

What is a audio frequency suppressor?

Frequency control transmissions, such as those used for tariff switching in ripple control systems, can be disturbed by various sources of interferences, such as compensation systems at the consumer, electronic frequency converters (e.g. at alternative power plants) or with cable networks with high capacities.
Interference frequencies attenuate the transmission level in the smart grid and cause failures and incorrect switching in the ripple control.

Audio frequency suppressors prevent the unwanted spread of interference frequencies in ripple control systems from the entire medium-voltage grid where the source of interference is located.

How does an audio frequency suppressor protect against energy network interferences?

An audio frequency suppressor creates a galvanic isolation between the medium-voltage network and the blocking circuit. The filter circuit consists of a medium-voltage transformer for each phase, with a shunt implemented on the secondary side and the capacitor unit. The impedance of this filter circuit is determined by customer according to network requirements.
Audio frequency suppressors can be used to lower the feed level for audio frequency transmissions in the smart grid, but also to protect customer networks in which frequency-sensitive devices or systems are operated from ripple control impulses.

Please find more information in the datasheet, in the download area.