Method for evaluating the mechanical performances of a switchgear device

摘要

A method for evaluating mechanical performance of a switchgear device having at least one pole which includes a pair of contacts movable between open and closed positions, a support arm of a first contact, a support arm drive including a rotary pole shaft and a rod pivotably coupling the drive to the support, an energy storage system for moving the arm to close the contacts, and a toggle device with a trip latch, the method including measuring the angle of rotation of the pole shaft during contact closing, deriving specific values by measuring the angle of rotation, comparing the values with an initial reference value, identifying wear performances of the drive by comparing the specific values with the reference value, determining first and second specific values on a variation curve of the angle of rotation, calculating the angular difference between maximum and final angles of rotation; and identifying a latching state of the toggle device as a function of the angular difference.

主权项

1. A method for evaluating the mechanical performances of a switchgear device which comprises at least one pole, each pole comprising:
a pair of contacts movable with respect to one another between an open position and a closed position; a support arm of a first contact; a support arm drive mechanism comprising:
a rotary pole shaft and at least one rod which pivotably couple the drive mechanism to the support arm,an energy storage system for moving said arm to place the main contacts in a closed position; anda toggle device associated with a trip latch;the method comprising:
measuring the angle of rotation of the pole shaft during a closing travel of the contacts; deriving at least two specific values from measuring the angle of rotation; comparing said specific values with a specific initial operating reference value of the switchgear device; identifying the mechanical wear performances of the drive mechanism by comparing the specific values obtained with the operating reference value; determining a first specific value on a variation curve of the angle of rotation corresponding to a time to reach a first local maximum on the variation curve, said first local maximum corresponding to the maximum angle of rotation reached by the pole shaft during closing travel of the contacts; determining a second specific value on the variation curve of the angle of rotation corresponding to a final angle of rotation reached when the pair of movable contacts is in a closed position; calculating the angular difference between the maximum angle of rotation and the final angle of rotation; identifying a latching state of the toggle device as a function of said angular difference.