IEEE C57.104-2019 pdf free download – IEEE Guide for the Interpretation of Gases Generated in Mineral Oil-Immersed T ransformers.
This guide is not apicable to lond tap changers (LTC) and to ranstomers with main tank insulating liquid in contact with LTC insulaing bquid, for example, a common expansion tank (refers mostly to in-ank type LTCs) or common air spuce inside the expansion tank. Loud Tap Changer DGA. is covered by IEEE Sd C57.139TM [B106]. This guide is not pplcable 10 transformers using ary insulating liquid other than mineral oil. Transformers using an estr-based liquid, are covered by IEEE Std C57.1557M [B109].
Transformers using silicone liquid, are covered by IEEE Std C57.146T1 (B107]. The user of this guide must consider the iterenal components of the tasfrmer when choosing to apply the guide to specifie trunsformer types suchwind turbine transfomers oT netwoark transformers. Such ransformers may have auxiliary components such as lood break switches (as an eample) immersed in the same oill as the transformer itself. As such a component produces an electrical anc and combustible gases s a normal part of its openation, the user of this guide must consider the pssibilitieis tha: -The transformer oil DGA results may be almost entinely a result of swich opention, and not an accunte rflctiom of the health of the transformer itelf.”
-The gases produced by the switch operatio may be much greater than the gases produced by the tran siomer iself, and therefore may mak any problems assciated with the transformer that might otherwise be detcable via DGA interpretation. results from transformers identifed as wind turbine or network transformers oficn had ecessively elevated typical values, in some case two orders of magnitude higher that the rest of the DGA database. There was 00 infrmation to indicate if the transfomers were healthty or under extreme distress.
Therefore, the DGA data. subset from wind burbine and nectwork tarsformers was not included in the study to obtain the norms used in this guide. Consaquently, if the user of this guide applies the norms presented herein to such ransformer types, the result may often be bhigh DGA saius levels. In the case of w ind turbine tastformers in particular, they have special operating canditins i that they are closely oneeted to power eletronis and have frequently and widely fuctuating loads. Some of the earlier generation designs of these tansformers were not adequately robust for such operating coditionse, and hence the ofien clevated gas values ane seen. For further insight into wind turbine transformer design and their particular DGA iscs, refer to“Wind Power Transformer Design” [B102] and “Uousual DGA results in wind turbine tuasfromers” [B129].
Sampling of tmns former insulating liquid for DGA should be done by suitably trained persormel fllwing standard procedures such as ASTM D923.2 The measurement of gas concentrations should be performed by an analytical laboralory according to the methods defined in ASTM D3612, or by suitably trined personnel using a portable instument, or bysuitably conmescted on-ine monitoring device.
The interpretation of DGA data should be performed by a suitably trained and experienced person. Computer analysis of the DGA results wih tols such as sreadseese, databases, alytial sotware, σr maintenance mangement systems, can be used when evaluating the health and condition of a transformer. Any other relevant information, such as ranstfomner tamplate, facory test reports, operational and maintenance records, in service test results and environmental conditins, should also be comsidered in such evaluation. An aggregate of all awailable infrmatio is generally comsidered the optimal approach when a detailed iterpetatiean is required.
The nature of the imerpctation also depends upon the context 时 application of the DGA. For various reasons. some of which are explained in this guide, DGA results can sometimes be indeterminate or misleading. and somnetimes DGA can fail to detect or identify a fault that may be present.IEEE C57.104 pdf download.