Interruption

01:34 / Posted by tech data /

An interruption occurs when the supply voltage or load currentdecreases to less than 0.1 pu for a period of time not exceeding 1 min.Interruptions can be the result of power system faults, equipmentfailures, and control malfunctions. The interruptions are measured bytheir duration since the voltage magnitude is always less than 10 per-cent of nominal. The duration of an interruption due to a fault on theutility system is determined by the operating time of utility protectivedevices. Instantaneous reclosing generally will limit the interruptioncaused by a nonpermanent fault to less than 30 cycles. Delayed reclos-ing of the protective device may cause a momentary or temporary inter-ruption. The duration of an interruption due to equipment malfunctionsor loose connections can be irregular.Some interruptions may be preceded by a voltage sag when theseinterruptions are due to faults on the source system. The voltage sagoccurs between the time a fault initiates and the protective device oper-ates.

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