
Transformers 239
calculate: (i) the maximum permissible primary and secondary
currents, (ii) the number of primary turns.
400 x 10
3
VA
(i) Maximum primary current = = 50 A
Y J
8000V
400 x 10
3
VA
Maximum secondary current =
7
200 V
= 2000 A
100 x 8000
= 4000 turns
200
400 kVa is the rating of the transformer. This means that the
product of the voltage and current must not exceed 400 x 10
3
.
10 PRINT "PROG 207"
20 PRINT "SOLUTION TO EXAMPLE 16"
30 INPUT "ENTER TRANSFORMER RATING" ; KVA
40 INPUT "ENTER PRIMARY VOLTAGE" ; VP
50 INPUT "ENTER SECONDARY VOLTAGE" ; VS
60 INPUT "ENTER SECONDARY TURNS" ; NS
70 LET IP=KVA/VP
80 PRINT "PRIMARY CURRENT = ...