The prospective short-circuit current (PSCC), available fault current, or short-circuit making current is the highest electric current which can exist in a particular electrical system under short-circuit conditions. It is determined by the voltage and impedance of the supply system. It is of the order of a few thousand amperes for a standard domestic mains electrical installation, but may be as low as a few milliamperes in a separated extra-low voltage (SELV) system or as high as hundreds of thousands of amps in large industrial power systems.
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| - Verwachte kortsluitstroom (nl)
- Prospective short-circuit current (en)
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| - The prospective short-circuit current (PSCC), available fault current, or short-circuit making current is the highest electric current which can exist in a particular electrical system under short-circuit conditions. It is determined by the voltage and impedance of the supply system. It is of the order of a few thousand amperes for a standard domestic mains electrical installation, but may be as low as a few milliamperes in a separated extra-low voltage (SELV) system or as high as hundreds of thousands of amps in large industrial power systems. (en)
- Verwachte kortsluitstroom is de maximale hoeveelheid stroom die door een bepaalde installatie kan stromen onder kortsluitomstandigheden. In het Engels wordt de term prospective short-circuit current gebruikt. Het wordt bepaald door de spanning en impedantie van het voedingssysteem. (nl)
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| - The prospective short-circuit current (PSCC), available fault current, or short-circuit making current is the highest electric current which can exist in a particular electrical system under short-circuit conditions. It is determined by the voltage and impedance of the supply system. It is of the order of a few thousand amperes for a standard domestic mains electrical installation, but may be as low as a few milliamperes in a separated extra-low voltage (SELV) system or as high as hundreds of thousands of amps in large industrial power systems. Protective devices such as circuit breakers and fuses must be selected with an interrupting rating that exceeds the prospective short-circuit current, if they are to safely protect the circuit from a fault. When a large electric current is interrupted an arc forms, and if the breaking capacity of a fuse or circuit breaker is exceeded, it will not extinguish the arc. Current will continue, resulting in damage to equipment, fire, or explosion. (en)
- Verwachte kortsluitstroom is de maximale hoeveelheid stroom die door een bepaalde installatie kan stromen onder kortsluitomstandigheden. In het Engels wordt de term prospective short-circuit current gebruikt. Het wordt bepaald door de spanning en impedantie van het voedingssysteem. Beveiligingsinrichtingen zoals automaten en zekeringen dienen een te hebben die de verwachte kortsluitstroom overschrijdt, om de veiligheid van het circuit te waarborgen tegen een storing. Wanneer een grote elektrische stroom wordt onderbroken, vormt zich een vlamboog en als het uitschakelvermogen van een stroomonderbreker wordt overschreden, zal deze boog niet worden gedoofd. De stroom zal doorgaan, wat resulteert in schade aan de apparatuur, brand of explosie. (nl)
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