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Power System Operation and Control - Introduction - Important Short Questions and Answers: Power System Operation and Control - Introduction

1. What is load curve?

^{Ø }The curve drawn between the variations of load
on the power station with reference to time is known as load curve.^{}

^{Ø }There are three types, Daily load curve,
Monthly load curve, Yearly load curve .^{}

^{ }

2. What is daily load curve?

^{Ø }The curve drawn between the variations of load
with reference to various time period of day is known as daily load curve.^{}

^{ }

3. What is monthly load curve?

^{Ø }It is obtained from daily load curve.^{}

^{ }

^{Ø }Average value of the power at a month for a
different time periods are calculated and plotted in the graph which is known
as monthly load curve.^{}

^{ }

4. What is yearly load curve?

^{Ø }It is obtained from monthly load curve which is
used to find annual load factor.^{}

^{ }

5. What is connected load?

^{Ø }It is the sum of continuous ratings of all the
equipments connected to supply systems.^{}

^{ }

6. What is Maximum demand?

^{Ø }It is the greatest demand of load on the power
station during a given period.^{}

^{ }

7. What is Demand factor?

^{Ø }It is the ratio of maximum demand to connected
load.^{}

*Demand factor= (max demand)/ (connected load)*

8. What is Average demand?

^{Ø} The
average of loads occurring on the power station in a given period (day or month or year) is known as average
demand.

*Daily average demand = (no of units generated
per day) / (24 hours)*

*Monthly average demand = (no of units generated
in month) / (no of hours in a month) Yearly average demand = (no of units
generated in a year) / (no of hours in a year)*

9. What is Load factor?

^{Ø} The
ratio of average load to the maximum demand during a given period is known as
load factor.

*Load factor = (average load) / (maximum demand)*

10. What is
Diversity factor?

The ratio
of the sum of individual maximum demand on power station is known as diversity
factor.

*Diversity factor = (sum of
individual maximum demand)/(maximum demand).*

11. What is
Capacity factor?

This is
the ratio of actual energy produced to the maximum possible energy that could
have been produced during a given period.

**Capacity factor = (actual energy
produced) / (maximum energy that have been ****produced)**

12. What is
Plant use factor?

It is the
ratio of units generated to the product of plant capacity and the number of
hours for which the plant was in operation.

*Units generated per annum= average
load * hours in a year*

13. What is Load
duration curve?

When the
load elements of a load curve are arranged in the order of descending
magnitudes the curve then obtained is called load duration curve.

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