IEC 60567-2012 pdf free

07-19-2021 comment

IEC 60567-2012 pdf free.Oi-filled electrical equipment – Sampling of gases and analysis of free and dissolved gases – Guidance.
Before analysing the gases dissolved in oil, they are first extracted from the oil. Three basic methods are described, one using extraction by vacuum (Toepler and partial degassing), another by displacement of the dissolved gases by bubbling the carrier gas through the oil sample (stripping) and the last one by partition of gases between the oil sample and a small volume of the carrier gas (headspace). The gases are analysed quantitatively after extraction by gas chromatography; a method of analysis is described. Free gases from gas-collecting relays are analysed without preliminary treatment.
The preferred method for assuring the performance of the gas extraction and analysis equipment, considered together as a single system, is to degas samples of oil prepared in the laboratory and containing known concentrations of gases (“gas-in-oil standards”) and quantitatively analyse the gases extracted. Two methods of preparing gas-in-oil standards are described.
For daily calibration checks of the chromatograph, it is convenient to use a standard gas mixture containing a suitable known amount of each of the gas components to be in a similar ratio to the common ratios of the gases extracted from transformer oils.
The techniques described take account, on the one hand, of the problems peculiar to analyses associated with acceptance testing in the factory, where gas contents of oil are generally very low and, on the other hand, of the problems imposed by monitoring equipment in the field, where transport of samples may be by un-pressurized air freight and where considerable differences in ambient temperature may exist between the plant and the examining laboratory.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
lEG 60296, Fluids for electrotechnical applications — Unused mineral insulating oils for transformers and switch gear
IEC 60475:2011, Method of sampling insulating liquids
IEC 60599, Mineral oil-impregnated electrical equipment in service — Guide to the interpretation of dissolved and free gases analysis
Iso 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results ASTM 02780, Standard Test Method for Solubility of Fixed Gases in Liquids
3 Sampling of gases from gas-collecting (Buchholz) relays
3.1 General remarks
It is important to bear in mind that receiving a qualitative and a representative sample is crucial for obtaining a reliable diagnosis of the electrical equipment. Even the most sophisticated extraction or diagnosis methods cannot overcome faulty samples.
Gas samples from relays should be taken from the equipment with the minimum delay after gas accumulation has been signalled. Changes in composition caused by the selective reabsorption of components may occur if free gases are left in contact with oil.
Certain precautions are necessary when taking gas samples. The connection between the sampling device and the sampling vessel shall avoid the ingress of air. Temporary connections should be as short as possible. Any rubber or plastic tubing used should have been proved to be impermeable to gases.
Gas samples should be properly labelled (see Clause 4) and analysed without undue delay to minimize hydrogen loss (for example, within a maximum period of one week).
Oxygen, if present in the gas, may react with any oil drawn out with the sample. Reaction is delayed by excluding light from the sample, for example, by wrapping the vessel in aluminium foil or suitable opaque material.IEC 60567 pdf free download.

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IEC/TR 62809-2013 pdf free Free IEC Standards

IEC/TR 62809-2013 pdf free

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