The document discusses factors that affect load shedding, which is the process of automatically disconnecting electrical load to match generation when there is a frequency drop in the power system. It notes that the key factors include the anticipated maximum overload, load reduction factor, number of load shedding steps, size of load shed at each step, frequency and time settings of relays, and location of relays. The document also mentions considerations for load shedding of industrial systems and provides an introduction and conclusion.
3. introduction
Load shedding :
To disconnect the load automatically by frequency
sensetive relay termed as load shedding.
Under frequency load shedding
Object :
To balance the load and the genaration .
The load is shed a block at a time untill the frequency
stabilize.
4. Factors affecting load shedding
Maximum anticipated overload
• load reduction factor (d)
• For safest d=0;
Number of load shedding steps
Most utilities use between 2 to 5 load shedding step.
3 is the most common.
5. Size of load shed at each step
• Express as % of overload
• % overload = (load-power input/power output)*100
