초록 ▼

To determine the remaining lifetime of contactor contacts, the contact spring action at the clearance gap can be determined as a substitute criterion for contact erosion, and to determine the erosion of the contact points, the change in spring action during the shutdown cycle can be measured and con

To determine the remaining lifetime of contactor contacts, the contact spring action at the clearance gap can be determined as a substitute criterion for contact erosion, and to determine the erosion of the contact points, the change in spring action during the shutdown cycle can be measured and converted to the remaining lifetime, for which purpose, the time of the armature movement from the start of the armature movement to the start of contact opening is measured with the solenoid actuator having an armature with solenoids and associated yoke. The measured values of the time signal tk of contact opening on the load side of the switching device monitored and the time signal tA are determined by voltageless signaling of the start of armature movement. In particular for use in three-phase systems, the switching voltage is measured as a voltage change at an artificial neutral point. In the respective arrangement, a voltageless signal line is provided between the switching device and analyzer unit.

대표청구항 ▼

1. A method for determining a remaining lifetime value of contacts in a switchgear, comprising the steps of:determining a contact spring action at a contact gap; during a shutdown cycle, measuring each change in the contact spring action to determine a contact erosion, including the steps of measuri

1. A method for determining a remaining lifetime value of contacts in a switchgear, comprising the steps of:determining a contact spring action at a contact gap; during a shutdown cycle, measuring each change in the contact spring action to determine a contact erosion, including the steps of measuring a run-time value of an armature path from a first start of an armature movement in a contactor solenoid actuator to a second start of an opening of at least one of the contacts, the measuring step being performed on a load side of the switchgear, the first start of the armature being determined by a voltageless signaling of a start of the armature movement, determining a path length as a function of the run-time value, and determining the change in contact spring action by a change in the path length; determining an erosion of at least one of the contacts as a function of the change in the contact spring action; and determining the remaining lifetime value of the at least one of the contacts as a function of the erosion.