SPDC Terms beginning with L

Terms and definitions extracted from current SPDC published documents
Click one of the capital letters above to advance the page to terms beginning with that letter.
lifetime rated pulse currents

Rated values of the peak impulse current, IPP, as a function of the number of pulses and wave shape, which may be applied over the device rated lifetime.
[62.37-1996]

lifetime rated pulse currents (Varistor).

derated values of Itm for impulse durations exceeding that of an 8/20 µs waveshape, and for multiple pulses which may be applied over device's rated lifetime.
[C62.33-1982]

lightning

An electric discharge that occurs in the atmosphere between clouds or between clouds and ground.
[C62.72-2007]

lightning

An electric discharge that occurs in the atmosphere between clouds or between clouds and ground.
[C62.11-2005]

lightning impulse protective level of a surge-protective device

The maximum lightning impulse voltage expected at the terminals of a surge-protective device under specified conditions of operation.
NOTE — The lightning impulse protective levels are given by following: 1) Front-of-wave impulse sparkover or discharge voltage, and 2) the higher of either a 1.2/50 impulse sparkover voltage or the discharge voltage for a specified current magnitude and waveshape.
[C62.82.1-2010]

lightning overvoltage

A type of transient overvoltage in which a fast front voltage is produced by lightning or fault. Such overvoltage is usually unidirectional and of very short duration.
[C62.82.1-2010]

lightning overvoltage

The crest voltage appearing across an arrester or insulation caused by a lightning surge.
[C62.22-2009]

lightning surge

A transient electric disturbance in an electric circuit caused by lightning.
[C62.22-2009]

lightning surge

A transient electric disturbance in an electric circuit caused by lightning.
[C62.11-2005]

lightning surge

A transient electric disturbance in an electric circuit caused by lightning.
[C62.72-2007]

line terminal

The conducting part of the arrester provided for connecting the arrester to the circuit conductor.
[C62.11-2005]

liquid-immersed type arrester

An arrester designed for use immersed in an insulating liquid.
[C62.22-2009]

local surge (rotating electric machinery)

A surge that originates on the same voltage system as the machine with no transformation between.
[C62.21-2003]

longitudinal (common) mode voltage

The voltage common to all conductors of a group as measured between that group at a given location and an arbitrary reference (usually earth).
[C62.31-2006]

longitudinal insulation configuration

An insulation configuration between terminals belonging to the same phase, but which are temporarily separated into two independently energized parts (e.g., open switching device).
[C62.82.1-2010]

longitudinal overvoltage

An overvoltage that appears between the open contact of a switch.
[C62.82.1-2010]