22-05-2014, 12:07 PM
A PRESENTATION ON DIFFRENCE BETN INTERRUPTION &OUTages,TYPES OF INTERRUPTION AND ITS EFFECT ON POWER QUALITY
DIFFRENCE BETN INTERRUPTION.pptx (Size: 94.74 KB / Downloads: 12)
INTRODUCTION
A[/n interruption is defined as a reduction in the supply voltage or load current to a level less than 0.1pu for a time not more than 1 minutes.
Power outages are total interruptions of electrical power supply.utilities have installed protection equipment.
[b]TYPES 0F INTERRUPTION:-
Interruptions are classified by IEEE 1159 into either a short-duration or long-duration variation. However, the term “interruption” is often used to refer to short-duration interruption, while the latter is preceded by the word “sustained” to indicate a long-duration. They are measured and described by their duration since the voltage magnitude is always less than 10% of nominal.
LONGER INTERRUPTION
Longer interruptions power cuts are usually thought of as being caused by the supplier but can also is caused by the failure of on-site equipment,conductors &connection.
Caeful design high resillence techinique can minimize the effect
The objective is to be identify single points of failure &eliminate them by providing redudant equipment or alternative supply paths so that operation can be continue despite a single line.
SUSTAINED INTERRUPTION
Sustained Interruption is defined by IEEE 1159 as the decrease in the voltage supply level to zero for more than one (1) minute. It is classified as a long duration voltage variation phenomena. Sustained interruptions are often permanent in nature and require manual intervention for restoration. they are specific power system phenomena and have no relation to the usage of the term outage.
Sustained interruptions are usually caused by permanent faults due to storms, trees striking lines or poles, utility or customer equipment failure in the power system or miSCoordination of protection devices. Consequently, such disturbances would result to a complete shutdown of the customer facility.