Capacitors elements
Nov 23,2019

Capacitor element

Device consisting essentially of two electrodes separated by a dielectric (IEV 436-01-03).

Capacitor unit

Assembly of one or more capacitor elements in the same container with external terminals (IEV 436-01-04).

Capacitor bank

Multiple capacitor units connected so as to act together (IEV 436-01-06).


The word “capacitor” is used when it is not necessary to put particular stress on the different meanings of the terms ca- pacitor unit or capacitor bank.

Discharge device of a capacitor

Device that may be incorporated in a capacitor, capable of reducing the voltage between the terminals practically to zero within a given time after the capacitor has been disconnected from a network (IEV 436-03-15, modified).

Internal capacitor fuse

Fuse connected inside a capacitor unit, in series with an ele- ment or a group of elements (IEV 436-03-16).

Line terminal

Terminal intended for connection to a line conductor of a network (IEV 436-03-01).

Rated capacitance of a capacitor CN

Capacitance value derived from the values of rated output, voltage and frequency of the capacitor (IEV 436-01-12).

Rated output of a capacitor QN

Reactive power for which the capacitor has been designed (IEV 436-01-16).

Rated voltage of a capacitor UN

RMS value of the alternating voltage for which the capacitor has been designed (IEV 436-01-15).

Rated frequency of a capacitor fN

Frequency for which the capacitor has been designed (IEV 436-01-14).

Rated current of a capacitor IN

RMS value of the alternating current for which the capacitor has been designed (IEV 436-01-13).

Capacitor losses

Active power dissipated in the capacitor (IEV 436-04-10).

Maximum permissible AC voltage  of  a  capacitor

Maximum rms alternating voltage which the capacitor can sustain for a given time under specified conditions(IEV 436-04-07).

Maximum permissible AC current of a capacitor

Maximum rms alternating current that the capacitor can sustain for a given time under specified conditions (IEV 436-04-09)

Ambient air temperature

Temperature of the air at the proposed location of the capacitor.

Steady-state condition

Thermal equilibrium attained by the capacitor at constant output and at constant ambient air temperature.

Residual voltage

Voltage remaining on the terminals of a capacitor at a certain point in time following disconnection.

Creepage distance

The shortest distance, or the sum of the shortest distances, along the insulating parts of an insulator between parts that normally have the operating across them.(IEV 471-01-04, modified)

Unified specific creepage distance (USCD)

Creepage distance of an insulator divided by the rms value of the highest operating voltage across the insulator. This is normally expressed in mm/kV and as a minimum.

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