New starting device for three-phase asynchronous motors in cogeneration plants consisting of an electronic soft starter is connected in combination with star-triangle-switchover for the reduction of the start-up current

摘要

The new starting device is presented here, a three-phase asynchronous unit coupled with an internal combustion engine is characterized in that the circuit, electrical design of a combination of soft starter is connected (1A, B: element 1) and the vacuum (the soft starter is connected, in the case of fig. 1a are cut into two or three phases. In the case of fig. 1b, all three phases of the anchoring). The run-up begins with the starting of the asynchronous machine from the stationary state by a protection (1A, B: element 2) in a star circuit. According to a set time is followed by the soft starter is connected, so that the asynchronous machine is operated by means of a motor. The internal combustion engine starts with the ignition of the fuel; after the asynchronous machine the internal combustion engine to their load-related, motor speed has raised. The real power is regulated to a desired value and the soft starter is connected is then switched off. The desired value can be between 0 – 100% of the rated active power, by means of a motor or, as a generator. According to a set time is followed by the switching off of the star contactor. According to a further set time, the connection of the delta relays (1A, B: element 3), in order to operate in a triangle, the asynchronous machine. The soft starter is connected is now again to a set time in addition to this, so that a renewed build-up during the flow time is achieved. The starting process is completed. All set times can also have the value ‘ 0 ".