Scaling Resistor

A resistor added to an output circuit of measurement equipment to provide a scaled voltage output. The output is not a “true” voltage output and may be susceptible to loading errors.

SCADA

Supervisory Control and Data Acquisition.

SAIFI

A distribution system reliability measure of the system average interruption frequency index. It measures sustained outages and interruptions and is a metric for the entire power system.

SAIDA

A distribution system reliability measure of the system average interruption duration index. It is commonly measured in customer minutes of interruption and is commonly used as an electric service performance metric.