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IB131006EN

Page v

Effective 07/2017

SECTION 5: DESCRIPTION AND OPERATION

5-1 Introduction ................................................................................................................................................ 25

5-2 Interrupter Assembly .................................................................................................................................. 25

5-2.1 Vacuum Interrupter .................................................................................................................. 25

5-2.2 Contact Erosion Indication ....................................................................................................... 26

5-2.3 “T” Cutout Loading Spring Indicator ......................................................................................... 26

5-2.4 Contact Wipe and Stroke ......................................................................................................... 26

5-2.5 Phase Barrier ........................................................................................................................... 26

5-3 Stored Energy Mechanism ........................................................................................................................ 28

5-3.1 Operation of Stored Energy Mechanism ..................................................................................... 28

5-3.2 Charging ....................................................................................................................................... 31

5-3.3 Closing Operation ....................................................................................................................31

5-3.4 Tripping Operation ...................................................................................................................31

5-3.5 Trip Free Operation ...................................................................................................................... 31

5-4 Control Schemes .................................................................................................................................31

5-4.1 Timing .....................................................................................................................................35

5-4.2 Secondary Disconnects ...........................................................................................................35

5-4.3 Undervoltage Trip Device ........................................................................................................35

5-5 Interlocks and Interfacing .....................................................................................................................36

5-6 Levering Mechanism ............................................................................................................................36

5-7 Operations Counter ..............................................................................................................................36

5-8 Ground Contact....................................................................................................................................36

5-9 MOC and TOC Switch Operations .......................................................................................................36

SECTION 6: INSPECTION, MAINTENANCE AND TROUBLESHOOTING

6-1 Introduction ..........................................................................................................................................37

6-2 Frequency of Inspection and Maintenance ...........................................................................................37

6-2.1 Qualified Personnel ...............................................................................................................37

6-2.2 General Torque Guidelines ....................................................................................................38

6-3 Inspection and Maintenance Procedures .............................................................................................38

6-4 Vacuum Interrupter Integrity Test .........................................................................................................40

6-5 Contact Erosion and Wipe ...................................................................................................................41

6-6 Insulation .............................................................................................................................................41

6-7 Insulation Integrity Check .....................................................................................................................42

6-8 Primary Circuit Resistance Check ........................................................................................................43

6-9 Mechanism Check ...............................................................................................................................43

6-9.1 CloSure

Test .......................................................................................................................43

6-10 Lubrication ...........................................................................................................................................47

6-11 Troubleshooting Chart .........................................................................................................................50

6-12 End of Life Procedure…………………………………………………………………………………………...50

6-13 Failure Reporting…………………………………………………………………………………………………50

SECTION 7: RENEWAL PARTS

7-1 General ..............................................................................................................................................51

7-1.1 Ordering Instructions .............................................................................................................51

Courtesy of NationalSwitchgear.com