Non-instantaneous system switching device and storage battery deterioration diagnosis method

摘要

PROBLEM TO BE SOLVED: To provide a device capable of reducing trouble caused by long-term deterioration of a mechanical switch.SOLUTION: An uninterruptible system switching device includes: a switching circuit including semiconductor switches 2a and 2b capable of supplying either power from an active system 1a or power from a reserve system 1b to a load 4 and provided in a cable run between 1a and 4 and a cable run between 1b and 4 and a mechanical switch 3c which is connected in parallel with 2a and 2b and of which the contact can be switched by a mechanical switching mechanism; and a control circuit 20 which applies an operation command to 2a and 2b, applies an operation command to the mechanical switching mechanism and applies the commands so as to overlap an operation period in which a contact of 3c is conducted and an operation period in which 2a and 2b are conducted. The uninterruptible system switching device also includes switching operation detection circuit 18a for detecting a time from the application of the switching command from 20 to the mechanical switching mechanism of 3c to completion of a switching operation of the contact; and a waveform storage circuit 21 for storing a detection result of 18a.SELECTED DRAWING: Figure 1