초록 ▼

A method for determining switchgear-specific data at contacts in switchgear and/or operation-specific data in a network connected to the switchgear includes detecting a so-called contact follow-through travel at a switching path as an equivalent criterion for an erosion of contacts, particularly for

A method for determining switchgear-specific data at contacts in switchgear and/or operation-specific data in a network connected to the switchgear includes detecting a so-called contact follow-through travel at a switching path as an equivalent criterion for an erosion of contacts, particularly for contactor contacts. A resilience change during a shutdown cycle is measured, can be used to determine the erosion and can be converted into a remaining contact life for the contacts. Accurate measurement of the armature movement from a start of the armature movement to a start of contact opening is required for that purpose. Switching states of a switching device and of the electrical network are additionally detected from signals for resilience detection. An apparatus for carrying out the method is also provided.

대표청구항 ▼

[ We claim:] [1.]1. A method for determining at least one of switchgear-specific data at contacts in switchgear or contactors and operation-specific data in a network connected to the switchgear or contactors, which comprises:detecting a contact follow-through travel on a switching path as an equiva

[ We claim:] [1.]1. A method for determining at least one of switchgear-specific data at contacts in switchgear or contactors and operation-specific data in a network connected to the switchgear or contactors, which comprises:detecting a contact follow-through travel on a switching path as an equivalent criterion for erosion;measuring a resilience change during a shutdown cycle in each case in order to determine an erosion of contact facings of contact pieces and converting the resilience change to a remaining contact life, by performing a time measurement of an armature movement from a start of the armature movement to a start of contact opening for a monitored switchgear including a magnetic drive with an armature, a magnet coil and an associated yoke;determining a path of the armature movement from the measured time, determining the resilience from the armature using a measured-value acquisition of a start of the contact opening on a load side of the monitored switchgear and signaling an armature movement start from a voltage of the magnet coil; anddetermining switching, operating and fault states at the switchgear drive and in an electrical network, in addition to the contact follow-through travel, from the resilience detection signals by measuring the voltages at the magnet coil of the switching device drive and at switching poles of the switchgear drive.