Third Rail Insulator Failures: Current State of the Practice (2020) / Chapter Skim
Currently Skimming:
Pages 15-21
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 15... ...
15 Case Examples 4.1 Case 1 Case 1 provides bus, heavy rail, and demand-responsive transportation services. The nominal traction power voltage of the third rail is 600-750 V, which is common in third rail systems all around the world; however, this system is equipped to employ a maximum voltage of 750-1,000 V for voltage regeneration during operation.
|
From page 16... ...
16 Third Rail Insulator Failures: Current State of the Practice insulators and employs maintenance-management tracking software and standard operating procedures for inspections and maintenance. The third rail safety standards and regulations are updated by the agency every 4 or 5 years to provide continual improvement to the system's reliability.
|
From page 17... ...
Case Examples 17 4.2 Case 2 This agency operates both heavy and light rail and handles an average of 50 million passenger trips per year. The nominal traction power system voltage is 750 to 1,000 V, and the system can regenerate its voltage while it is operating.
|
From page 18... ...
18 Third Rail Insulator Failures: Current State of the Practice Several safety-failure events have occurred in the Case 2 systems, including smoke events caused by arcing, damage to electrical propulsion equipment, and poor track conditions caused by corrosion and electrolysis. Safety compliance inspections and investigations are conducted once a year, which increases the safety of the workers.
|
From page 19... ...
Case Examples 19 • Fires caused by electrical short circuits, and • Poor track conditions due to electrolysis and corrosion. Safety compliance inspections and investigations are conducted by the Case 3 agency every 2 years.
|
From page 20... ...
20 Third Rail Insulator Failures: Current State of the Practice The configuration of most of the insulators is a base with two holes, through which bolts are installed and anchored in concrete. All the contact rails are the top contact type; 80 miles are made of steel and 20 miles are made of composite.
|
From page 21... ...
Case Examples 21 access to the insulators. Snap-on cover boards on under-running third rails and protection boards on over-running third rails limit access and require outages for removal and service.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.