4
:
to determine the maximum size of sets for =
the next phase of generation development, the following
table
was
prepared :
Set Size as % of Peak Demand
Peak
Demand
275 MW
350 MW
500 MW
660 MW
MW
Set
Set
Set
Set
1981
1783
15.4
19.6
28.0
37.0
1982
1924
14.3
18.2
4
26.0
34.3
1983
2074
13.3
16.8
24.1
31.8
1984
2225
12.4
15.7
22.5
29.7
1985
2377
11.6
14.7
21.0
27.8
1986
2533
10.9
13.8
19.7
26.1
•
It can be seen from the table that 350 MW sets
would be the largest that the CLP system could accommodate in the early 1980's when additional generating capacity is required.
(d) Generating Capacity
CLP require reserve capacity for the following purposes:
(a) to cater for unscheduled demand and restrictions
of generating plant, and
(b) to provide continuous operating reserve in
Case of a sudden trip of the largest
generating unit.
"
This reserve capacity comprises, in appropriate proportions, spinning reserve' 'hot standby', 'gas turbine standby' etc, each of which plays an important part in the overall security of the system. 'Spinning reserve' is in the form of part- loaded machines ready to give instantaneous supply while 'hot standby' is plant primed to provide supply in about an hour.
The remaining reserves are to cover plant maintenance etc. CLP's decisions on the plant needed furnish this reserve
capacity are based on the following considerations.
ta