**2.7. Interruptions**

Interruption is a randomly event that occurs with zero-magnitude voltage or current for a particular time period, where the magnitude of voltage or current is less than 0.1 pu. It is classified in terms of duration and standards as follows:

## **A.** Classification according to prior planning

According to EN 50160 [15], the electrical interruptions can be categorized into two types, namely, pre-organized interruptions at which the customers are informed (planned interruptions) and accidental interruptions at which sudden failure of equipment or transient fault take place and it may take a long time to restore the electrical supply. This may be long interruption or short interruption based on the fault.

**B.** Classification according to interruption duration

According to IEEE 1250 [16], the electrical interruptions can be categorized into four types according to the duration of the interruption as present in **Table 1**.

Momentary interruptions may cause a complete loss of voltage, while sustained interruptions are generally noticed in case of permanent short-circuit faults.
