IEEE 638-2013 pdf free download – IEEE Standard for Qualification of Class 1 E Transformers for Nuclear Power Generating Stations.
4.5 Electrical, mechanical, and structural interfaces
Suflica.’nt detail about interfaces between the translirvnet and conn.cied equipment shall he spceifled to allow far simulation of plwucal loads during seismic tots, as stated in 6.4 Specific examples include lead susporl systemx, connectors, conduit systems, motinling details, etc.
4.6 Industry codes and standards
The qiecitic industry codes aid staisdarsk to which the tmnsIornier is to be built. i!ialiticatiani tested, aid routitse tested shall he specified
4.7 Impedance
The specification shall include a requiretnait tue mossuring and recording the itqsedance value an each tap poairion. This inftwrmtrion is useful for detailed load flow oudiets, IEEE Stal Ci? 12110 said IEEE Sad £571201 proxide standards far tttedanee niettsurensent and allowable tolerances of the measured impedatce value tWin the spcctfied impedance salue
4.8 Nonslnuso4dal load currents
IEEE Stil C57.12.txt and IEEE Sad £5712.01 define standard scrsice eandittuaxa for laid esittents as hetng appaxixinattely sinusoidal, aid the hanntsn.c factor, as defined in IEEE Sad C57.12.lfO, shall nut exceed 005 per rant. II’ during sens’ice. the trasislórnser is to experience nunsmusosdal load currents with a harmonic Ihetar exceeding the 0.05 per taut lund, IEEE Sad CS?. (It) idiall be tailized in nrder an delernune the transformer capability. If the nnakirmer will experience such nonsititusoithil load currents in sersice. this nsty cause aiMitiottal load losses to the transformer that if not adequssely aecoutired for in the design of the transtbrnier, could lead to acceterated aging of the trsnst’xsrmer and a subsequently reduced sersice Ide
Ii ncmsiiisootdal load currents are so he applied to the tranafarsner. rIte harnattwc wecinttn to which the trwistkirmer wsll he sabjeeted shall be specified to the transliirnser manufacturer as pail 0 the design specification. The hannonic sgsectnans iaipçihed sbraxld he identified as to whether it is inossured on the primary or secondary side of the tnnsfornrr
4.9 ShIpping, storage, and handling requirements
Shippaig. erage. and handling requirements shelf be specified, including Liinitaiaons aasd’or any special requirements.
4.10 Margin
The equipment specification shall include the required ratings and performance criteria, niehading any required ninrgiss within the contest and intent of IEEE Std 323.
5. Approaches to transformer qualification
5.1 Acceptable approaches
The following wproaches we acceplabk for use in Ininsfoenser qualification, and successful qtnh fit-sian programs shall Inc lade the elements listed in 5.2 to 5.6 below that are applicable foe the particular transtbmier to be qualified. Transformers to he qualified shall n all applicable requtreniorits of the IEEE (‘57 series of standards referenced in Clause 2.
5-2 Testing
Transformer tegs are conducted as combinations of”rmttine” and “design” tests, as described in Clause 6 These rests arc defined in IEEE Ski (‘57,1210. and requircunents and test proeedtses are desctibed at IEEE Sad C57.12.IXI, IEEE Sail (37.12.01, IEEE Sid C57.l2.90, IEEE Sad C57.I2.91, and IEEE Sad 344. Successful comptetann of these tests and qsecified acceptance cnteria. as defined in the abose•referenced standamrm*s, is requred for qualilscation, thus demonstrating that the transformer is capable of meeting the perfoensance res]tarensahts in the user’s specification.
&3 Thermal life qualification
When thermal aging effects based on qualified life of insulation and stimpon system hase been denzsnstrated to he negligible, seismic tests ma> he performed without prior thernsal aging.
When thermal aging effects based on qualified life cannot he demonstrated to be negligible then themial aging of the trarsifonner under qualification shall be performed prior to seismic testing of the referenced transt’smrrner. The l’olkmwmng apprma-h may he used to esalunie the thermal Life of the transformer.
Due to lunitatmons related to physical sin, energy reqtarcmn,’mts. and elapsed tone, thermal aging of a csmmnpkte mransk’rtncr may nor he practical. Alto. bs.sr.ausm,’ of the probable inability of thermal aging proceduees to condition a complete transfortner to a known end of quaLified Life. attempting to thermally age a complete transformer pnor to qualification testing is ntemss likely not practical Therefore, in lieu of ilsemially’ aging a complete taanssfornser. it is acceptable to thermally age sssndings. consponents. or salid insulation system nsodels and immersals (acctsascly representing transformer designs to be qiatliliesl I to deienname the themnsal effects expected to acme during the transformer’s opening life.
Acceptable aging procedates and end-powit testing aee outlined in IEEE Std (37.12.60 or IEEE Sad (‘57.100. Other ihernial aging peocedmres may he used prosided that jun.sification in aereed upon hetwern nianafacturer and user The data used to support the thermal aging procedures shall he peflinent to the application and shall he asailable to an auditable form.IEEE 638 pdf download.