Indian Railways
CHAPTER 1
INTRODUCTION
1.1 PANTO ENTANGLEMENT
Electric locomotive gets power from overhead contact wire through pantograph. For smooth operation of locomotive, the movement of pantograph should be unobstructed on the contact wire. When any broken part of pantograph comes in between overhead wires or vice versa, panto entanglement takes place.
The OHE is meant for supply of power where as the pantograph is for collecting power for the locomotive. The parameters of designs of OHE and pantograph are such that the pantograph remains in contact with contact wire with sufficient pressure to collect current.
Pantograph normally used on AC locomotives are Faively types AM-12. The whole assembly of pantograph is mounted on the insulated base of locomotive roof. It is operated for its raising/ lowering positions with compressed air through servomotor.
OHE is also designed in such a way that the contact wire always remains on the top of pantograph. At turn outs the contact wire of main line and secondary line are adjusted in such a way that main line contact wire always remains below the secondary line contact wire. This permits smooth working of loco on high speed on main line.
Panto entanglement causes damage to pantograph and overhead equipment resulting in dislocation of electric traction traffic.
1.2 CONSTRUCTION OF PANTOGRAPH AM – 12
Pantograph is an essential fitting of electric locomotives. There are two pantographs mounted on the roof of an electric locomotive, each one on four insulators as shown in figure 1.1 and 1.2. At a time one is raised and connects the locomotive with the OHE contact wire. Normally the pantograph rear to cab used for driving is raised i.e. rear to the direction of movement of the locomotive (if rear is defective or damaged, front can be used to work).
The pantograph consists of a base on which a horizontal spindle is fitted. One end of lower arm is
INTRODUCTION
1.1 PANTO ENTANGLEMENT
Electric locomotive gets power from overhead contact wire through pantograph. For smooth operation of locomotive, the movement of pantograph should be unobstructed on the contact wire. When any broken part of pantograph comes in between overhead wires or vice versa, panto entanglement takes place.
The OHE is meant for supply of power where as the pantograph is for collecting power for the locomotive. The parameters of designs of OHE and pantograph are such that the pantograph remains in contact with contact wire with sufficient pressure to collect current.
Pantograph normally used on AC locomotives are Faively types AM-12. The whole assembly of pantograph is mounted on the insulated base of locomotive roof. It is operated for its raising/ lowering positions with compressed air through servomotor.
OHE is also designed in such a way that the contact wire always remains on the top of pantograph. At turn outs the contact wire of main line and secondary line are adjusted in such a way that main line contact wire always remains below the secondary line contact wire. This permits smooth working of loco on high speed on main line.
Panto entanglement causes damage to pantograph and overhead equipment resulting in dislocation of electric traction traffic.
1.2 CONSTRUCTION OF PANTOGRAPH AM – 12
Pantograph is an essential fitting of electric locomotives. There are two pantographs mounted on the roof of an electric locomotive, each one on four insulators as shown in figure 1.1 and 1.2. At a time one is raised and connects the locomotive with the OHE contact wire. Normally the pantograph rear to cab used for driving is raised i.e. rear to the direction of movement of the locomotive (if rear is defective or damaged, front can be used to work).
The pantograph consists of a base on which a horizontal spindle is fitted. One end of lower arm is