Definitions

paper  (from Electropedia IEC)

cellulosic paper of certain types, frequently characterized by their relatively high rigidity
Note – In general the term paper is used for cellulosic papers if not otherwise specified. [source]

Kraft paper (from Wikipedia)

Electrical insulation paper (from Wikipedia)

(paper) board – cardboard, precompressed cardboard (from IEC Electropedia)
generic term applied to certain types of cellulosic paper frequently characterized by their relatively high rigidity
Note – For some purposes, materials of grammage (mass in grammes per square meter surface area) less than 225 g/m2 are considered to be paper, and materials of grammage of 225 g/m2 or above are considered to be board. [source]

Nomex  (from IEC Electropedia)

TUP (dalla IEC 62874:2015)
thermally upgraded kraft paper

The average value of the number of monomeric units in the molecules of a polymer
Note – Different average values (number, mass, or viscometric average) can be determined for the same material. [source]

An undesired departure in the operational performance of any device, equipment or system from its intended performance
Note – The term “degradation” can apply to temporary or permanent failure. IEV ref. 161-01-19  [source]

A static piece of apparatus with two or more windings which, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power – IEV ref 421-01-01 [source]

Mineral insulating oil

insulating liquid derived from petroleum crudes
Note – Petroleum crude is a complex mixture of hydrocarbons with small amounts of other natural chemical substances.
IEV ref. 212-17-02 [source]

Natural esters (dalla IEC 62770)
vegetable oils obtained from seeds and oils obtained from other suitable biological materials and comprised of triglycerides
IEC 62770, ed. 1.0 (2013-11)

Synthetic organic ester (dall’Electropedia IEC)
insulating liquid produced from acids and alcohols by chemical reaction
Note – These esters include mono-, di- and polyol-esters.
IEV ref. 212-17-08 [source]

Reclaiming (from IEC Electropedia)
elimination of soluble and insoluble contaminants from an insulating liquid or gas by chemical adsorption means, in addition to mechanical means, in order to restore properties as close as possible to the original values or to the levels proposed in this standard
Published in: IEC 60480, ed. 2.0 (2004-10) – Reference number: 3.3.5 – Source: IEV 212-09-05 (modified) [source]

Reconditioning (from IEC Electropedia)
process that eliminates or reduces gases, water and solid particles and contaminants by physical processing only
Published in: IEC 60422, ed. 4.0 (2013-01) – Reference number: 3.5 [source]

Depolarization (from IEC Electropedia)
process of removing electrical polarization from an electrical insulating material until the depolarization current is negligible
NOTE Depolarization is generally recommended before measuring the resistive properties of an electrical insulating material.
Published in: IEC 62631-1, ed. 1.0 (2011-04) – Reference number: 3.12 [source]