
461Quality of Power
They can cause more distortion to other area customers and hence are imposed with
a smaller total harmonic distortion (THD) limit in their load current. A small cus-
tomer can hardly distort the system voltage even by continuously drawing high har-
monics in small load current; hence, they do not draw much attention.
16.7 INTERNATIONAL STANDARDS
The generally acceptable line voltage variations at a medium voltage distribution
point in four countries are listed in Table 16.4. The permissible variations are higher
in developing countries like China, India, and many Eastern European and South
American countries. The allowable s ...