4.4.3.1 Charging the stored energy spring system ........................................ 34
4.4.3.2 Opening and closing the VD4 type circuit-breaker ............................ 34
4.4.4 Circuit-breaker – type HD4 ............................................................................... 35
4.4.4.1 Manual operation for spring charging................................................. 35
4.4.4.2 Electrical operation for spring charging.............................................. 35
4.4.4.3 Circuit-breaker closing........................................................................ 35
4.4.4.4 Circuit-breaker opening ...................................................................... 36
4.4.5 Earthing switch - type EM................................................................................. 37
4.4.5.1 General ............................................................................................... 37
4.4.5.2 Manual opening and closing............................................................... 38
4.5 Voltage presence indicating systems........................................................................... 39
4.5.1 Voltage presence indicating systems CL-497 and CL-498.............................. 39
5 Service and maintenance ...................................................................................................... 40
5.1 General warnings and cautions.................................................................................... 40
5.2 Maintenance intervals................................................................................................... 42
5.3 Inspection......................................................................................................................43
5.4 Servicing .......................................................................................................................44
5.5 Repair ........................................................................................................................... 45
5.5.1 Switchgear in general....................................................................................... 45
5.5.2 Replacement of melted fuse links .................................................................... 46
5.5.2.1 Investigate and clear a fault ............................................................... 46
5.5.2.2 Removal of the fuse links. .................................................................. 47
5.5.2.3 Installing the fuse links ....................................................................... 47
5.6 Testing withdrawable parts........................................................................................... 48
5.6.1 Testing interlock conditions .............................................................................. 48
5.7 Spare parts, auxiliary materials and lubricants ............................................................ 51
5.7.1 Spare parts ....................................................................................................... 51
5.7.2 Auxiliary materials and lubricants..................................................................... 51
6 Troubleshooting ..................................................................................................................... 52
7 Product quality and environmental protection....................................................................... 54
7.1 General .........................................................................................................................54
7.2 Packing materials ......................................................................................................... 55
7.3 Materials used in production ........................................................................................ 55
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