Eaton QD5 Manual
Also see for COOPER POWER SERIES: Installation and operation instructionsInstallation instructionsInstallation instructionsInstallation and operation instructionsOperation instructions
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ContactsAll movable and main stationary contacts employcopper-tungsten alloy tips at points subjected to arcingduty. Contact points not subjected to arcing employ acombination of EPT copper to provide a high conductivitycurrent path. Movable contacts are split to make contacton both sides of mating parts and resist separation duringhigh current surges. Contact pressure is maintained by steelcompression springs.Main stationary contactsThe main stationary contact is used for stationary tapcontacts and the neutral contact.Main movable contactsThe main movable contact assembly is made up of a setof two individual contact assemblies and a thermal setmaterial insulating arm. Each of the main movable contactsmakes contact with the main stationary contacts as thetap changer rotates through each tap position. At least oneof the main movable contacts remains in contact with astationary contact at all times. The main stationary contactsbolt to collector rings. The collector rings insert betweena set of button contacts that are able to hold a continuouscurrent path through all 32 steps of the tap changer andwhile in neutral. The movable contact assemblies areidentical and can be used for either the right or left handcontacts.Reversing stationary contactsThe set of reversing switch stationary contacts on the QD5tap-changer consist of three individual stationary contacts,a VL-Reversing Stationary, a Reversing Neutral Stationary,and a VR-Reversing Raise Stationary contact. The reversingswitch stationary contacts see less operating duty than themain stationary contacts and therefore do not utilize thecopper-tungsten alloy arcing tips.Figure 5. Main movable contact assembly.Figure 6. VL reversingstationary.Figure 7. Figure 8. Neutral reversingstationary.Figure 8. Figure 7. VRreversing stationary.Figure 4. Main stationary contact.Copper-TungstenArcing Tips3QD5 QUIK-DRIVE TAP-CHANGER INSTALLATION AND MAINTENANCE INSTRUCTIONS MN225012EN March 2016 |
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