Mechanical bypass switch device, converter arm and power converter

摘要

It is provided a mechanical bypass switch device arranged to bypass a converter cell in a power converter. The mechanical bypass switch device includes: a mechanical switch; a mechanical switch actuator arranged to make the mechanical switch conduct when supplied with an electric signal; a first control input; and a second control input. The mechanical bypass switch device is arranged such that a control signal, provided on either one of the first control input and the second control input or on both of the first control input and the second control input, causes the mechanical switch to conduct. A corresponding converter arm and bypass converter are also presented.

主权项

1. A mechanical bypass switch device arranged to be directly connected between the terminals of a first converter cell to bypass the first converter cell in a power converter, the mechanical switch device comprising:
a mechanical switch; a mechanical switch actuator arranged to make the mechanical switch conduct when supplied with an electric signal; a first control input; a second control input; a first control switch whose electrical conductive state is controlled using the first control input; a second control switch whose electrical conductive state is controlled using the second control input; and a control switch combination comprising the first control switch connected in parallel with the second control switch; wherein the control switch combination is serially connected with the mechanical switch actuator, and wherein the mechanical bypass switch device is arranged such that a control signal, provided on either one of the first control input and the second control input or on both of the first control input and the second control input, causes the mechanical switch to conduct and such that the first control input is to be connected with a local control unit of the first converter cell and the second control input is to be connected with a local control unit of a second converter cell.