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.