Glossary of Terms - P

Padmount Transformer - A transformer designed for mounting on a concrete pad with underground connecting cables.

Parking Stand Arrester - A metal oxide varistor elbow with a parking stand bracket used for overvoltage protection of open point cable runs.

Peak Demand - The maximum integrated demand during a time period.

Peak Line Current - Maximum instantaneous current during a cycle.

Percent IR (%IR) - The voltage drop due to conductor resistance at rated current expressed in percent of rated voltage.

Percent IX (%IX) - The voltages drop due to reactance at rated current expressed in percent of rated voltage.

Percent IZ (%IZ) - The voltage drop due to impedance at rated current expressed in percent of rated voltage.

Phase - Classification of an ac circuit usually single-phase, two wire or three wire; two-phase, three wire or four wire; or three-phase, three wire or four wire.

Power Fuse - In accordance with ANSI/IEEE C37.46, a power fuse (expulsion and current-limiting) has high voltage ratings of 2.8-167 kV and x/r ratios of 15-25 (refer to distribution fuse).

Power Follow Current - Refer to Follow Current.

Power-Frequency Sparkover Voltage - The rms value of the lowest power-frequency sinusoidal voltage that will cause sparkover when applied across he terminals of an arrester.

Power-Frequency Withstand Voltage - A specified rms test voltage at power frequency that will not cause a disruptive discharge.

Power Outage - An interruption of power.

Primary Taps - Taps added in the primary winding (see Tap).

Primary Voltage Rating - Designates the input circuit voltage for which the primary winding is designed.

Primary Winding - A winding connected to the voltage source or input.

Probe - The male connecting piece of a Deadfront M.O.V.E. arrester.

Prorated Section - A complete, suitably housed part of an arrester comprising all necessary components, including gaseous medium, in such a proportion as to accurately represent, for a particular test, the characteristics of a complete arrester.

Puncture - Term used when a disruptive discharge occurs through a solid dielectric. A disruptive discharge in a solid dielectric produces a permanent loss of dielectric strength; in a liquid of gaseous dielectric, the loss may be only temporary.

Glossary Index