No.4 Business Building-2707, China Central Place
Chaoyang District, Beijing-100021, China
Email:[email protected]
北 京 大 林 绿 源 环 保 科 技 有 限 公 司
BEIJING DAELIM GREEN EP TECH CO., LTD.
Audible Sound Level
Audiblesoundfromtransformersoriginatesprincipallyinthetransformercoreandtransmitsthroughthe
dielectricfluidand/orstructuralsupports,totheoutershell and/orothersolid surface, whereit radiatesas
airbornesound.Insomesituations,the windingsmaybeanoisesourceunderratedloadconditions,butthis
noiseisnotincludedinthisstandard.Thefrequencyspectraoftheaudiblesoundconsistsprimarilyofthe
even harmonics of the power frequency; thus, for a 60 Hz power system, the audible sound spectra consists of
tones at 120 Hz, 240 Hz, 360 Hz, 480 Hz, and so on. The audible sound also contains the noise emitted by any
dielectricfluidmechanicalcoolingsystem.Mechanicalcoolersoundconsistsofbroadbandfannoise,plus
discrete tones at the fan blade passage frequency and its harmonics.
9. Maintenance
9.1 Spare Parts
Daelimspecializesinmanufacturingcustom transformersandmakesonly limited quantitiesof anyone
design. Replacement parts are best handled on a case-by-case basis. Should additional orreplacement parts
benecessaryforany Daelim unit,pleasecontactthefactoryandprovideallavailablenameplatedata.
9.2 Routine Inspection
Routine inspection of the exterior of the unit should be performed periodically. The inspection interval should
take the environmental conditions of the site into consideration. Salty, damp or otherwise corrosive
environments will require shorter inspection intervals than dry and mild conditions.
Periodicallycheckbetweentheradiators(ifequipped)fordebrisandobstructions. Ensurethattheunitis
getting adequate airflowandthat brush,overgrowth orsurroundingequipment isnot impedingproper
airflow. Iftheunitisequippedwithforcedaircooling,manuallycyclethefansusingtheswitchinthecontrol
paneltoensureproperoperation. Cleananydirtorbuildupawayfromthebaseandcabinetareastoprevent
premature rust anddeterioration.
Duringanexternalinspection,checkthepaintforsignsofdeterioration,includingcrackedorchippingpaint
andrustspots. Ifpaintdamageor deteriorationhasoccurred,touch-uporrepainttheexterioroftheunitas
soon as possible to prevent further degradation.Daelim uses several different painting processes depending
on the application. An inquiry to the factory, with the serialnumber of the unit, will determine thetype and
compatibility of the touch-up paint required.
Gauges should be checked regularly for proper operation. The temperature gauge should fluctuate with load
conditionsandambienttemperaturebutshouldneverreadoverthedesignvalueonthenameplateplusthe
averagedailyambienttemperature(forexample,ifitisa25°Cdayandithasa65°Cratingonthenameplateit
shouldnotreadover90°Conthegauge). Theliquidlevelgaugewillalsofluctuateslightlywithtemperature
and loading but a steady drop may indicate a leak and should be addressed. The pressure/vacuum gauge will
varywithtemperatureaswell,butshouldneverregisterzeroforprolongperiodsoftime(anotherindication
of a leak).
