Eaton COOPER POWER Series Installation, Operation, And Maintenance Instructions And Parts Replacement Information
Also see for COOPER POWER SERIES: Installation and operation instructionsInstallation instructionsInstallation instructionsInstallation and operation instructionsOperation instructions
                        | |
Contents
| 
Flash and fire pointsRelatively small percentages (2-3%) of transformer oil orcontaminants may substantially reduce the flash and firepoint of R-Temp fluid. If it is suspected that the fluid mayhave been exposed to contamination, the flash and firepoint should be measured in accordance with ASTM D-92.A fire point lower than 300°C probably indicates somecontamination by lower fire point material. If flash or firepoints fall below the minimum values required, retrofillingmay be required.Drain and refillIf it is necessary to drain and refill the transformer, specialcare should be taken to avoid the entrapment of gasbubbles in the system. Sufficient time should be allowedbetween refilling and energization of the transformer to besure that any gas bubbles created during the process havedissipated.Contact your Eaton representative for additional handlingguidelines.PEAK™ and Envirotemp™ FR3™ fluid-filledtransformersPeriodic maintenance should be performed on thesame schedule as would be used for units of similarapplication filled with transformer oil. The same type ofsampling techniques should be used (ASTM-D923). Basicrecommended tests for Envirotemp™ FR3™ fluid aredielectric strength, moisture content and flash and firepoints.Acceptance values should meet or exceed those shown inIEC 61203, "Guide for Maintenance of Transformer Esters inEquipment".CAuTIONWhen the insulating fluid temperature is less than –10ºC(14ºF), no-load tap changers and energized loadbreakswitches should not be operated and the Bay-O-Netfuses should not be used to make or break a load(Operations at lower temperatures may be possibleprovided it is certified by the switching devicemanufacturer for loadbreak operation in Envirotemp™FR3™ fluid at lower temperatures )If the transformer cover or manhole must be removedfor internal service, exposure time to ambient air shouldbe minimal. Avoid exposure times greater than 24 hours.Immediately after service is completed, replace the cover ormanhole. Then, purge and recharge the headspace with drynitrogen.The procedure for recharging the headspace with nitrogenshould include the following steps:1. Fill headspace with dry nitrogen to a pressure of 2-3psig.2. Vent headspace to atmospheric pressure.3. Refill headspace with nitrogen to 2-3 psig.4. Verify that the unit is hermetically sealed.If the manhole cover or non-flapper style Bay-O-Net fusesare removed for more than 24 hours, any oxygen absorberpacket(s) should be replaced.Transformer oil contaminationEnvirotemp™ FR3™ fluid is fully miscible with oil. Thereis no known detrimental performance impact whenEnvirotemp™ FR3™ fluid is mixed with mineral oil.Conversely, except for some reduction in flash and firepoints, the same is true for oil mixed in with Envirotemp™FR3™ fluid. More than 7% mineral oil in Envirotemp™FR3™ fluid is required to drop the fire point to below300ºC. To maintain its exceptional environmentalclassification, contamination of Envirotemp™ FR3™dielectric coolant by any other fluids should be avoided.Contact your Eaton representative for additional handlingguidelines.Spare parts and serviceWe suggest that you keep one spare set of gaskets forthe manhole and any gasket-type bushings used. Otherrenewal parts may be ordered through your local factoryrepresentative. When replacing components, includinggaskets, on a PEAK transformer ensure they are rated forPEAK level operating temperatures. When ordering parts orrequesting service, provide a complete description of thepart or the problem and the complete transformer serialnumber as listed on the nameplate.15SubStation tranSformer inStallation and partS replacement information MN202002EN JUNE 2016 |
Related manuals for Eaton COOPER POWER SERIES
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine