IEC 60599 pdf download.Mineral oil-filled electrical equipment in service – Guidance on the interpretation of dissolved and free gases analysis
1 Scope
This International Standard describes how the concentrations of dissolved gases or free gases may be interpreted to diagnose the condition of oil-filled electrical equipment in service and suggest future action. This standard is applicable to electrical equipment filled with mineral insulating oil and insulated with cellulosic paper or pressboard-based solid insulation. Information about specific types of equipment such as transformers (power, instrument, industrial, railways, distribution), reactors, bushings, switchgear and oil-filled cables is given only as an indication in the application notes (see Annex A). This standard may be applied, but only with caution, to other liquid-solid insulating systems. In any case, the indications obtained should be viewed only as guidance and any resulting action should be undertaken only with proper engineering judgment.
3 Terms, definitions and abbreviations
3.1 Terms and definitions For the purposes of this document, the following terms and definitions, some of which are based on IEC 60050-1 91 , IEC 60050-1 92, IEC 60050-21 2 and IEC 60050-604, apply. 3.1.1 fault unplanned occurrence or defect in an item which may result in one or more failures of the item itself or of other associated equipment [SOURCE: IEC 60050-604:1 987, 604-02-01 ] 3.1.2 non-damage fault fault which does not involve repair or replacement action at the point of the fault Note 1 to entry: Typical examples are self-extinguishing arcs in switching equipment or general overheating without paper carbonization or stray gassing of oil. [SOURCE: IEC 60050-604:1 987, 604-02-09] 3.1.3 damage fault fault that involves repair or replacement action at the point of the fault [SOURCE: IEC 60050-604:1 987, 604-02-08] 3.1.4 incident event of external or internal origin, affecting equipment or the supply system and which disturbs its normal operation Note 1 to entry: For the purposes of the present standard “incidents” are related to internal faults. Note 2 to entry: For the purposes of the present standard typical examples of “incidents” are gas alarms, equipment tripping or equipment leakage. [SOURCE: IEC 60050-604:1 987, 604-02-03] 3.1.5 failure loss of ability to perform as required Note 1 to entry: In electrical equipment, failure will result from a damage fault or incident necessitating outage, repair or replacement of the equipment, such as internal breakdown, rupture of tank, fire or explosion. [SOURCE: IEC 60050-1 92:201 5, 1 92-03-01 ] 3.1.6 electrical fault partial or disruptive discharge through the insulation 3.1.7 partial discharge electric discharge that only partially bridges the insulation between conductors Note 1 to entry: A partial discharge may occur inside the insulation or adjacent to a conductor.Note 2 to entry: Scintillations of low energy on the surface of insulating materials are often described as partial discharges but should rather be considered as disruptive discharges of low energy, since they are the result of local dielectric breakdowns of high ionization density, or small arcs, according to the conventions of physics. Note 3 to entry: For the purposes of this standard the following consideration may also be added: – Corona is a form of partial discharge that occurs in gaseous media around conductors that are remote from solid or liquid insulation. This term shall not be used as a general term for all forms of partial discharges – As a result of corona discharges, X-wax, a solid material consisting of polymerized fragments of the molecules of the original liquid, can be formed. [SOURCE: IEC 60050-21 2:201 0, 21 2-1 1 -39] 3.1.8 discharge (disruptive) passage of an arc following the breakdown Note 1 to entry: The term “sparkover” (in French: “amorçage”) is used when a disruptive discharge occurs in a gaseous or liquid dielectric. The term “flashover” (in French: “contournement”) is used when a disruptive discharge occurs over the surface of a solid dielectric surrounded by a gaseous or liquid medium. The term “puncture” (in French: “perforation”) is used when a disruptive discharge occurs through a solid dielectric. Note 2 to entry: Discharges are often described as arcing, breakdown or short circuits. The following other specific terms are also used in some countries: – tracking (the progressive degradation of the surface of solid insulation by local discharges to form conducting or partially conducting paths); – sparking discharges that, in the conventions of physics, are local dielectric breakdowns of high ionization density or small arcs. [SOURCE: IEC 60050-604:1 987, 604-03-38] 3.1.9 thermal fault excessive temperature rise in the insulation Note 1 to entry: Typical causes are – insufficient cooling;
IEC 60599 pdf download
