Overcurrent and short-circuit detector

A method for detecting an overcurrent and/or short-circuit when a current signal which has a predeterminable time resolution is picked up in an electrical current path, comprising:

• determining a first point in time of a predeterminable steep increase in the current signal;
• forming a temporal integral of current values of the current signal from the first point in time to a second point in time;
• comparing a pair of values, comprising a relevant value of the integral and the relevant value of the current signal, with at least one predeterminable limiting condition at predeterminable temporal intervals substantially continuously;
• and
• emitting an overcurrent and/or short-circuit signal if the pair of values exceeds a limiting condition.

An overcurrent and/or short-circuit detector, comprising:

• at least one current sensor configured to pick up a current signal which has a predeterminable time resolution in at least one electrical current path;
• and
• at least one evaluation unit, the at least one evaluation unit being configured to:
• determine a first point in time of a predeterminable steep increase in the current signal,
• form a temporal integral of current values of the current signal from the first point in time to a second point in time,
• compare a pair of values, comprising a relevant value of the integral and the relevant value of the current signal, with at least one predeterminable limiting condition at predeterminable temporal intervals substantially continuously, and
• emit an overcurrent and/or short-circuit signal to an outlet of the overcurrent and/or short-circuit detector if the pair of values exceeds a limiting condition,
• wherein the second point in time is at most one cycle duration of an applied mains power frequency after the first point in time.

An overcurrent and/or short-circuit detector, comprising:

• at least one current sensor configured to pick up a current signal which has a predeterminable time resolution in at least one electrical current path;
• and
• at least one evaluation unit, the at least one evaluation unit being configured to:
• determine a first point in time of a predeterminable steep increase in the current signal,
• form a temporal integral of current values of the current signal from the first point in time to a second point in time,
• compare a pair of values, comprising a relevant value of the integral and the relevant value of the current signal, with at least one predeterminable limiting condition at predeterminable temporal intervals substantially continuously, and
• emit an overcurrent and/or short-circuit signal to an outlet of the overcurrent and/or short-circuit detector if the pair of values exceeds a limiting condition, wherein the limiting condition is:
• (∫i y0)2/a2+(i−x0)2/b2≤1.