... , switches, capacitors, filter resistance, transformer, generators, motors, power cables, etc. ) from over-voltage damage to electrical appliances, insulation ... 3: Transformer with neutral point; 4 motor; 5: Parallel compensation capacitor; 6: Use of electrified railway; 7: AC ... ; 4: Transformer neutral point; 5: Electrical used; 6: Parallel compensation capacitor; 7: Use of electrified railway; 8: DC ...