Description of BS EN 60567:2005 2005

Deals with the techniques for sampling free gases from gas-collecting relays and for sampling oil from oil-filled equipment such as power and instrument transformers, reactors, bushings, oil-filled cables and oil-filled tank-type capacitors. Three methods of sampling free gases and three methods of sampling oil are described; the choice between the methods often depends on the apparatus available and on the quantity of oil needed for analysis. Before analysing the gases dissolved in oil, they must first be 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 (head space). 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 commons 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. The main changes with respect to the previous edition are listed below. Since the publication of the second edition of this standard, a number of new gas extraction methods have been developed and are commercially available, such as mercury-free versions of the standard Toepler and partial degassing methods, which are referenced to in Annex C of the present edition. The head space method, based on a new concept for the extraction of gases from oil is introduced as a full method in this third edition, and reference is made to a simplified version of it also in Annex C (shake test method). More sensitive chromatographic techniques have also been developed since the last edition, and are presented in this third edition.

Standard Number	BS EN 60567:2005
Title	Oil-filled electrical equipment. Sampling of gases and of oil for analysis of free and dissolved gases. Guidance
Status	Withdrawn
Publication Date	2005-12-02
Withdrawn Date	2012-02-29
Replaces	BS EN 60567:1993
Replaced By	BS EN 60567:2011
Identical National Standard Of	EN 60567:2005, IEC 60567:2005
Descriptors	Error correction, Quantitative analysis, Insulating oils, Accuracy, Extraction methods of analysis, Gas analysis, Sampling equipment, Test equipment, Oils, Samples, Degassing (chemical technology), Control samples, Electrical equipment, Sampling methods, Gases, Precision, Chemical analysis and testing, Dissolved gases, Relays, Testing conditions, Gas-solid chromatography, Mineral oils, Oil-filled electrical equipment, Calibration, Sensitivity
ICS	29.040.10 Insulating oils, 17.220.99 Other standards related to electricity and magnetism, 29.035.99 Other insulating materials
Committee	GEL/10
ISBN	0 580 47279 5
Publisher	BSI
Pages	68

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