Introduction to Electrical Power and Power Electronics

236 Introduction to Electrical Power and Power Electronics

higher voltage at a proportionally reduced current within its own K-factor (not to be con-

fused with the transformer K-rating). For example, if the line voltage is higher by a factor

of K ≤ 1.3, then these two kiloampere ratings must be lowered by a factor of 1/K.

9.4.2 CirCUit Breaker seleCtion

The circuit breaker has several ratings to select, such as

• Rated continuous current it carries within allowable temperature rise

• Rated line voltage it supports with adequate insulation to ground

TABLE 9.3

Typically Standard Circuit Breaker Specification for <2 kV Lines

Continuous Current Rating ...