Transmission system comprising: - a clutch module having an input (In) and a first and a second output (O1, O2), wherein between the first output and the input, a first clutch device (B, B1, C2) provided with first actuating means is present, and between the second output and the input a second clutch device (C, B2) with second actuating means is present, and - a transmission module, with an output (Out) and a first and a second input (i1, i2), wherein between the first input and the output, a first partial transmission provided with at least one transmission is present, and between the second input and the output a second partial transmission provided with at least one further transmission or a mechanical connection is present, - in which the two outputs (O1, O2) of the clutch module are connected to the two inputs (i1, i2) of the transmission module, - in which the two outputs of the clutch module and/or the two inputs of the transmission module are connected to each other and in which a connection between the two outputs of the clutch module and/or the two inputs of the transmission module is formed by short-circuit clutch, which is part of the transmission system, the transmission inside the first partial transmission is continuously variable within a specified transmission range, characterized in that the transmission in the first partial transmission is constructed as a planetary gear provided with at least three rotational members, of which a first rotation body forms the input of the transmission, a second rotation body forms the output of the transmission, and a third rotation body is connected to an electric motor that can be operated both as a motor and as a generator. - a clutch module having an input (In) and a first and a second output (O1, O2), wherein between the first output and the input, a first clutch device (B, B1, C2) provided with first actuating means is present, and between the second output and the input a second clutch device (C, B2) with second actuating means is present, and - a transmission module, with an output (Out) and a first and a second input (i1, i2), wherein between the first input and the output, a first partial transmission provided with at least one transmission is present, and between the second input and the output a second partial transmission provided with at least one further transmission or a mechanical connection is present, - in which the two outputs (O1, O2) of the clutch module are connected to the two inputs (i1, i2) of the transmission module, - in which the two outputs of the clutch module and/or the two inputs of the transmission module are connected to each other and in which a connection between the two outputs of the clutch module and/or the two inputs of the transmission module is formed by short-circuit clutch, which is part of the transmission system, the transmission inside the first partial transmission is continuously variable within a specified transmission range, characterized in that the transmission in the first partial transmission is constructed as a planetary gear provided with at least three rotational members, of which a first rotation body forms the input of the transmission, a second rotation body forms the output of the transmission, and a third rotation body is connected to an electric motor that can be operated both as a motor and as a generator.