ABB Uniswitch Operation And Maintenance Manual

Contents

ABB Uniswitch Operation And Maintenance Manual Manual pdf 26 page image

ABB 23Uniswitch Operation andMaintenance Manual UNI S14GB 05-024.2 Commissioning4.2.1 Preparatory workBefore connection withthe high-voltage powersupplyIn preparation for commissioning, the following work must be carriedout:• Check the general condition of the switchgear for any damage ordefects.• Visually inspect the switching devices, withdrawable parts, isolatingcontacts, insulating parts, etc.• Check the connection of the main earthing bar to the installationearthing conductor (following the appropriate safety regulations).• Check the paintwork for damage and, where necessary, touch up asdescribed in section 5.5.• Remove all residues of materials, foreign bodies and tools from theswitchgear.• Clean the switchgear, rubbing down insulating parts with a soft, dry,clean, non-fraying cloth. Remove any greasy or sticky dirt asdescribed in section 5.4.• Correctly remount all covers etc. removed during assembly andtesting procedures.• Remove transport caps from vacuum circuit-breakers - if still fitted.• Remove the lifting eyebolts on high current vacuum circuit-breakers- if still fitted.Preparatory work for SF6 circuit-breakers:• Clean the insulating parts with clean dry cloth.• Check that the upper and lower terminals are clean and free fromany deformation caused by shocks received during transport andstorage.• It is advisable to check the SF6 gas pressure.• Switch the auxiliary and control voltage on.• Carry out testing operations on switching devices manually or byelectrical control, and simultaneously observe the relative positionindicators.• Check mechanical and electrical interlocks for effectiveness, withoutusing force.• Set the protective devices in the switchgear to the required valuesand check their function with test equipment.• Instruct local operators regarding the basic details of regularhandling of the switchgear.