SPDC Terms beginning with A

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.
AC standby power (Varistor)

Pd
Varistor ac power dissipation measured at rated rms voltage Vm(ac).
[C62.33-1982]

anode

The electrode by which current enters the thyristor, when the thyristor is in the on-state with the gate open-circuited.
NOTE: This term does not apply to bi-directional thyristors.
[62.37-1996]

anti-parallel (connection)

A parallel combination of two semiconductor elements, where the main current entry electrode of one element connects to the main current exit electrode of the other element, allowing one element to pass current in one voltage polarity and the other element to pass current in the opposite voltage polarity. (syn: inverse-parallel connection in IEEE 100 )
[C62.37.1-2000]

arc current

The current that flows after breakdown when the circuit impedance allows a current that exceeds the glow-to-arc transition current. Syn:arc mode current.[C62.31-2006]

arc voltage

The voltage drop across the gas tube during arc current flow. Syn:arc mode voltage.
[C62.31-2006]

arrester

See: surge arrester.
[C62.22-2009]

arrester

See: surge arrester.
[C62.11-2005]

arrester discharge current

The current that flows through an arrester resulting from an impinging surge.
[C62.22-2009]

arrester discharge voltage

The voltage that appears across the terminals of an arrester during the passage of discharge current.
[C62.22-2009]

arrester disconnector

A means for disconnecting an arrester in anticipation of, or after, a failure in order to prevent a permanent fault on the circuit and to give indication of a failed arrester.
NOTE: Clearing of the fault current through the arrester during disconnection is generally done by the nearest source-side overcurrent-protective device.
[C62.41.1-2002]

arrester disconnector

A means for disconnecting an arrester in anticipation of, or after, a failure in order to prevent a permanent fault on the circuit and to give indication of a failed arrester.
NOTE: Clearing of the fault current through the arrester during disconnection is generally done by the nearest source side overcurrent-protective device.
[C62.11-2005]

arrester duty cycle rating

The designated maximum permissible root-mean-square (rms) value of power-frequency voltage between its line and ground terminals at which it is designed to perform its duty cycle.
[C62.22-2009]

arrester unit

Any section of a multi-unit arrester.
[C62.11-2005]

arrester, deadfront type

An arrester assembled in a shielded housing providing system insulation and conductive ground shield, intended to be installed in an enclosure for the protection of underground and pad-mounted distribution equipment and circuits.
[C62.11-2005]

arrester, distribution, heavy duty class

An arrester normally used to protect overhead distribution systems exposed to severe lightning currents.
[C62.11-2005]

arrester, distribution, light duty class

An arrester normally installed on and used to protect underground distribution systems where the major portion of the lightning stroke current is discharged by an arrester located at the overhead line/cable junction.
[C62.11-2005]

arrester, distribution, normal duty class

An arrester normally used to protect overhead distribution systems exposed to normal lightning currents.
[C62.11-2005]

arrester, liquid-immersed type

An arrester designed for use immersed in an insulating liquid.
[C62.11-2005]

arrester, riser pole type

An arrester for pole mounting normally used to protect underground distribution cable and equipment.
[C62.11-2005]

atmospheric correction factor

A factor applied to account for the difference between the atmospheric conditions in service and the standard atmospheric conditions. (In terms of this standard, it applies to external insulation only.)
[C62.82.1-2010]

avalanche breakdown diode (ABD)

A transient voltage suppressor that is a semiconductor diode with a single P-N junction or multiple, non-interactive P-N junctions, which may operate in either direction and employs its breakdown characteristics as part of its function.
NOTE—The ABD is also known as an avalanche-junction transient voltage suppressor, silicon avalanche diode (SAD) or transient voltage suppressor (TVS).
[C62.35-2010]