Eaton NOVA STS-15 Installation And Operation Instructions Manual

Also see for COOPER POWER SERIES: Installation and operation instructions Installation instructions Installation instructions Installation and operation instructions Operation instructions

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Eaton NOVA STS-15 Installation And Operation Instructions Manual Manual pdf 23 page image

18NOVA™ STS Single-Tank,Triple-Single,Electronically ControlledRecloserINSTALLATION AND OPERATION INSTRUCTIONS MN280046EN May 2016Test results for NOVA STS reclosers equipped with theinternal voltage sensing option will be influenced by thesource-to-ground connected sensing resistor.The following tests should be applied to the NOVA STSSingle-Tank, Triple-Single recloser system:Test 11. Close the recloser contacts.2. Ground the recloser.3. Connect terminals 2, 4, and 6 (see Figure 16) together.4. Apply proper test voltage (see Table 15) to terminals 2,4, and 6.5. The recloser should withstand the test voltage for 60seconds.Test 21. Close the recloser contacts.2. Ground the recloser.3. Ground terminal 2 and terminal 6.4. Apply proper test voltage to terminal 3.5. The recloser should withstand the test voltage for 60seconds.Test 31. Open the recloser contacts.2. Ground the recloser.3. Connect and ground terminals 1, 3, and 5 (see Figure16).4. Connect terminals 2, 4, and 6.5. Apply proper test voltage to terminals 2, 4, and 6.6. The recloser should withstand the test voltage for 60seconds.7. Reverse the connections: ground terminals 2, 4, and 6.8. Apply test voltage to terminals 1, 3, and 5 for 60seconds.9. The recloser should withstand the test voltage for 60seconds.Withstand test resultsThe high-potential withstand tests provide information onthe dielectric condition of the recloser and the vacuumintegrity of the interrupters.If the recloser passes the closed-contacts tests (Tests 1and 2), but fails the open-contacts test (Test 3), the cause islikely to be in the interrupter assembly. Retest each phaseindividually to determine the failed phase or phases.If a recloser fails the closed-contacts test, the cause is likelyto be a diminished electrical clearance or failed insulation.If the recloser does not pass Tests 1, 2, or 3, contact anauthorized service center or your Eaton’s Cooper Powerseries product representative.otee:N Test results for NOVA reclosers equipped with theinternal voltage sensing option will be influenced bythe source-to-ground connected sensing resistor,especially if DC high-potential testing is performed.Module flashover serviceIf a NOVA recloser module was exposed to an externalflashover, an inspection process is recommended to assureproper operation of the recloser. Should the NOVA recloserexhibit external flashover attributes (carbon tracking ordiscoloration), the following procedure is recommended:1. Bypass and remove the recloser from service asdescribed in this manual.2. Confirm the dielectric strength of the recloser byperforming high-potential withstand test. Refer to theHigh-potential withstand testing section of thismanual.3. Inspect the housing and lifting lugs for damage thatmay affect electrical and/or mechanical performance.If there is damage to either the housing or lifting lugsthey must be replaced or repaired.4. Inspect module for damage to the terminals. Removeany damaged terminals and replace.5. Inspect module for damage to the module conductorrods (0.63” diameter threaded rods on top and side ofmodule for affixing terminals). If there is damage to themodule rods, the module must be replaced. Contact anauthorized service center or your Eaton’s Cooper Powerseries representative.6. Inspect the operating rod for damage. Check themodule surface and major and minor sheds for cracks,holes, and major chips. If damage is present, themodule must be replaced. Contact your Eaton’s CooperPower series product representative.7. If no damage is found, clean the module with isopropylalcohol and a scratch-free, nylon scouring pad toremove any carbon deposit.8. Before returning to service confirm electrical operationby opening and closing the recloser with a control.Confirm the dielectric strength of the recloser byperforming a high-potential withstand test. Refer tothe High-potential withstand testing section of thismanual.