P0609


TRACKING PANTOGRAPH FOR BRANCHLINE ELECTRIFICATION


Moishe Garfinkle PhD
Advanced Railway Technology Group
PO BOX 15855
Philadelphia PA 19103


EXECUTIVE SUMMARY

An electrification system for dedicated coal-hauling branchlines is described whose construction cost is roughly half that of conventional catenary electrification. The system is designed for train speeds limited to 100 kph (62 mph) and based on the single-sidewire concept. Because stagger limitations are relaxed, far fewer stanchions are required, and these are lighter than those required for conventional catenary electrification, with all on-site catenary fabrication eliminated.

Contact between the contact-wire and the collector-head is maintained by a tracking pantograph whose operation is absolutely compatible with conventional catenary electrification in all respects. Accordingly, no special catenary frogs or electronic switches are required at turnouts.

A major uncertainty in cost estimations of railway electrification is the almost total lack of standardization. Stanchion load-bearing capacity and spacing depend on route grades, curvature, power requirements, and climate. In contrast, single sidewire electrification design is largely independent of the these variables.

The locomotive power collecting apparatus for single-sidewire electrification depends on electromechanical tracking to maintain the collector head in contact with the sidewire essentially independent of sidewire stagger. As a consequence of electronic tracking this apparatus permits:

a) sidewire tracking independently of lateral loading on the contact-wire or on the collector head;
b) the use of conventional crossed-contact conductors at turnouts without requirement of any overhead switching device; and
c) absolute compatibility with conventional catenary operation.


CONTENTS

INTRODUCTION
COMPARATIVE RAILWAY ELECTRIFICATION
Mainline Catenary Electrification
Branchline Catenary Electrification
Single-Sidewire Electrification
a) Contact-Wire Tracking
b) Sidewire Stanchion Requirements
c) Sidewire Stagger Considerations
d) Sidewire Sag Considerations
e) Cost Considerations
TRACKING PANTOGRAPH APPARATUS
a) Tracking Pantograph Operation
b) Construction
c) Elbow-Swivel Joint
d) Collector Head
e) Cross-Contacts
f) Cost Considerations
DISCUSSION
CONCLUSION


Tracking Pantograph for Branchline Electrification
Advanced Railway Technology Group
 
For Detailed Description Please Contact
Moishe Garfinkle PhD
Group Leader
 
(215) 235-5042