Feed-in transformers
Feed-in transformers
Audio frequency feed-in transformers for medium voltage applications are since decades a main part of EPRO is production program.
Due to the extreme high reliability of these devices with lifetimes of 30 years and more these devices still face worldwide demand.
Our customers in this area are the electric utility companies, mainly in Europe and plant manufacturers of ripple control systems.
Feed-in transformers are the link between the ripple control transmitter and the power grid. They are used to overlay the audio frequency, which is generated by the transmitter and at the same time to protect the network from interference frequencies. Feed-in transformers for example are used to switch between day and night power – tariffs.
To operate power plants economically and cost efficient, the capacity should be as constant as possible. In order to lower the peaks, energy is offered to a lower price during periods of lower load. This is done due to tariff switchovers with ripple control systems.
Audio frequency feed-in transformers are overlaying the network with a certain voltage, frequency and signal pattern, a receiver at the end consumer converts the signals and switches between the tariffs due to relais.
Frequency control transmissions, such as those used for tariff switching in ripple control systems, can be disturbed by various sources of interference such as compensation systems at the consumer, electronic frequency converters (e.g. at alternative power plants) or even 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.
EPRO´s Audio frequency suppressors are used to block unwanted audio frequency voltages in the medium voltage grid (e.g. in wind power plants). Another application is the remote control of the audio frequency signal from sensitive customer networks. (see audio frequency suppressors)
The devices are offered in serial or parallel versions for indoor and outdoor use.
Series couplings: Feed-in transformer/ converter coupling (Type FET + ET) and transformer coupling (type FGS)
Parallel coupling (type KT + FKT)
Our products
Serial feed-in transformers
Two models are available:
The Model FGS is executed with an open iron core, the models FET and ET are executed with a closed iron core. The devices are mounted serially into the medium voltage network (10 to 72,5 kV). A defined voltage with defined frequency and signal pattern is embossed to the network.
Please find more information in the datasheets via Downloads.
Parallel feed-in transformers
The parallel coupling type KT and FKT for outdoor application is mounted serially into the medium voltage network (10 to 72,5 kV). A defined voltage with defined frequency and signal pattern is embossed to the network.
Please find more information in the datasheets via Downloads.
Production of serial feed-in couplings type FET.
Production of parallel feed-in couplings type KT.