WIXLIB

Medium Voltage Dry Type TransformerInstallation, Operation, and Maintenance ManualCONTENTSSTANDARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 INSPECTION ON RECEIVING . . . . . . . . . . . . . . . . . . 23 HANDLING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 STORAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 DRYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 GROUNDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 FIELD TESTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510 CHANGING THE TAP POSITION. . . . . . . . . . . . . . . . 611 SOUND LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . 612 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . 613 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . 7WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7IMPORTANTSave this instruction sheet for future use of the productA safety program must be established, verified andfollowed by all personnel involved with the transformer.The information contained in this manual may not coverall variations in equipment or provide for all contingencieswhich might be met in installation, operation andmaintenance. Please contact factory if you have anyquestions or unique conditions.SAFETY WARNINGSYou will find various types of safety information throughoutthis manual. The following Safety Statements explain theirmeaning:This is the SAFETY ALERT SYMBOL. It is used toalert you to potential personal injury hazards. Obey all safetymessages that follow this symbol to avoid possible injury ordeath.DANGER indicates a hazardous situationwhich, if not avoided, will result in death or serious injury.WARNING indicates a hazardous situationwhich, if not avoided, could result in death or serious injury.CAUTION, used with the safety alertsymbol, indicates a hazardous situation which, if not avoided,could result in minor or moderate injury.CAUTION, used without the safety alertsymbol, is used to address practices not related to personalinjury.

2Medium Voltage Transformer Installation, Operation and Maintenance ManualSTANDARDS1 INTRODUCTIONAll Pioneer dry type power transformers are built according tothe following standards:004-5001-000 0618nCSA-C22.2 # 47 : Air Cooled (Dry-type) TransformersnCSA-C9-02: Dry-Type TransformerThis manual covers Dry Type Ventilated Medium VoltageTransformers. These instructions set out the limiting factors forsatisfactory performance of the transformers. The informationcontained herein outlines and describes the proper inspection,installation and maintenance of our units.nIEEE C57.12-01: Requirements for Dry-Type Distributionand Power TransformerANSI C57.12-55: Dry Type Transformers used in UnitInstallations, Including Unit Substations2 INSPECTION ON RECEIVINGnnIEEE C57.12-91: Test Code for Dry Type Distribution andPower TransformernCSA 22.2 #94: Special Purpose EnclosuresnUL1562: Transformer, Distribution, Dry-Type – over600VoltsFailure to follow instructions may result in death orserious injury.Only qualified personnel should install, inspect, ormaintain transformers. Normal operating voltages can behazardous.It is recommended that the installation work be governedby ANSI/IEEE C57.94, Recommended Practice forInstallation, Application, Operation and Maintenanceof Dry Type General Purpose Distribution and PowerTransformers.Electrical potentials hazardous to human life can existwithin this equipment when energized. Disconnect allinput power before opening case or touching internalparts. Use proper lock-out / tagout procedures.The information contained in this manual may not coverall variations in equipment or provide for all contingencieswhich might be met in installation, operation andmaintenance. Contact factory if you have any questions orunique conditions.Hazard of electrical shock, explosion or arc flash. Turnoff power supplying this equipment before working on it.Discharge all static charges held by coils. Failure to followthese instructions may result in death or serious injury.Although transformers are static devices, it is necessaryto use forethought coupled with care in installation. Thiswill result in satisfactory performance over a long periodof time. The minimum requirements for installation andmaintenance and limitations of operation have been setforth in this manual. Following these procedures will resultin satisfactory performance, whereas disregarding themcan void the warranty.IMPORTANTSave this instruction sheet for future use of the product.nVentilated dry type power transformers are shipped eithercompletely assembled in a sheet metal enclosure or as acore and coil assembly with a separate enclosure. All partsand components will be wrapped in a clean plastic.nInspect transformer immediately upon receipt for evidenceof damage or other indication of rough handling that mayhave happened during shipment. Examination should bemade before removing transformer from shipping vehicle.Careful inspection should be made for any evidence ofwater and other contaminants that may have entered thetransformer during shipment.nAny damage should be reported at once and a claimshould be filed with the carrier / shipment companyimmediately. Notify Pioneer of any report made.nOnce the transformer has been received, remove coveringand complete an internal inspection for any evidence ofdamaged of parts, loose or broken connections, brokenterminal board, dirt or other foreign materials. Correctivemeasures should be taken where necessary.3 HANDLING — LIFTING ANDROLLINGSmall transformers and assemblies are shipped on woodenpallets surrounded by a plastic wrap. The wood crate issuitable for moving with forklift truck. For larger transformersand assemblies, an overhead crane is needed. See Figure 1for diagram of lifting the power transformer.Unless there are clear instructions particular to your unit, neverlift the transformer by the case only. The lifting lugs outsidean empty enclosure on each corner are for lifting the enclosureonly before combining with core and coil.Power transformers are usually supplied with “knock down”enclosures. Enclosure roof panel, front and back access door,and cover are all bolted and can be removed for installationand maintenance. Lifting of the core and coil assembly shouldbe done with the four lifting eyelets on the core frames of thetransformer. See Figure 1A, B. Be careful to not drop tools orhardware into core and coil assembly.Care should be taken when assembling the enclosure over thecore and coil assembly to avoid damage because of the heightrestriction. There should be at least 20 feet of clearance fromthe top of the enclosure or lifting eyes, including the spreaderbars, to facilitate lifting.When lifting the transformer with the eyelets, always keepmaximum angle of 45 between the vertical and the chains.If jacking to move the core and coil assembly is needed,appropriate equipment should be placed under the basechannels or jacking pads if included.Before installing transformer in its final location, attach the AntiVibration Pads. See section 11 SOUND LEVEL.

004-5001-000 0618Medium Voltage Transformer Installation, Operation and Maintenance Manual3Figure 1: Instructions for moving the transformerA Remove the screws andthe panels from the topD When finished, reinstallthe top panels.B Use the lift points fromthe transformer as theattachment points. Becareful not to damagethe buss bars.CLift and carefully movethe transformer4 STORAGETransformers should be stored in a warm, dry location, freeof dust or airborne contaminants. The relative humidity towhich the insulation materials are exposed should be kept aslow as possible. The floor on which the transformer is storedshould be impervious to the upward migration of water vapor.Precaution should be taken to guard against entrance of waterfrom any source such as roof leaks, broken water or steamlines, windows, etc. If wrapped in plastic, use silica gel orequivalent to absorb any condensation.It is not recommended that dry type transformers bestored outdoors. If it is unavoidable, units should be wellprotected from snow, rain, and other elements. Protectionshould include an initial wrap of first quality canvas with afinal outside covering of plastic tarpaulin. If units are storedoutdoors, dryout before use is recommended as describedbelow.5 DRYOUTIf a transformer has been exposed to moisture such ascondensation or rain, or stored in a high humidity environment,the unit should be dried out prior to energization. If thetransformer was in operation it should be removed fromservice to dry it out. Any of the following dryout methods arerecommended:nFree moisture should be blown (25PSI max) or wiped offany surface of the transformer to reduce the time of the dryout period.nExternal forced air, hot or warmed, or radiant heat shouldbe directed up through the windings with all the ventilationopenings with all the ventilation opening a cleared.Recommended temperature should not exceed 110 C.This should continue for 24 hours or until after all evidenceof moisture or condensation is no longer visible.nElectric heaters can be installed inside the enclosure,particularly for units stored outdoors. These heatersshould be located under the windings on both sides ofthe core. If heaters are used, air circulation through theenclosure must still be permitted. Fiberglass furnace filtersmay be mounted temporarily over the inlet and outletventilation openings to minimize dust accumulation withinthe enclosure. These filters must be removed before thetransformer is put into service. Temperature should notexceed 110 C.nContact factory for specific instructions for dryout usinginternal heating through the shorted terminal method.Only qualified personnel should perform this method.Transformers that have been exposed to flood condition,direct rain or sprinklers may not be able to be dried outappropriately. Consult the factory for further instructions.It is emphasized that only specially authorized personnelshould undertake this task.