首页>
外国专利>
A method for determining the level of a switch, a method for triggering of a switch on the basis of the arc power and method for determining the loading of the contacts of a switch on the basis of the arc energy
A method for determining the level of a switch, a method for triggering of a switch on the basis of the arc power and method for determining the loading of the contacts of a switch on the basis of the arc energy
A method for determining the level (plb) which, in the case of a short circuit is converted in a switch,the switch contacts, which rest against each other when the switch is closed, and of which a stationary and the other on a contact arm is arranged, whereby the contact arm is acted upon by an elastic force, which is arranged at the contact arm of the movable contact in the case of the switch is closed presses against the stationary contact, andthe contact arm in the case of a short-circuit current through the current-induced forces, is moved so that the movable contact from the fixedly disposed contact with the formation of an electric arc separates,in the case of which a the switch associated detection device, the temporal course of the current flowing via the contacts (i) is detected,in the case of an electronic tripping unit in the case of satisfied current - tripping criterion triggers the separation of the contacts,characterized by the,that from the time profile of the current (i) the current-induced forces acting on the contact arm (fl, fh) are calculated,the current-induced acting on the contact arm and elastic forces (fl, fh, ff, fk) the contact opening distance (x) is calculated,that from the contact opening distance (x) and the time profile of the current (i) the arc voltage (ulb) is calculated andthat from the arc voltage (ulb) and the time profile of the current (i) the level (plb) is calculated.
展开▼
