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Powering Queensland Rail’S 7,000Km Track Network - An Eltek case Study

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Information about Powering Queensland Rail’S 7,000Km Track Network - An Eltek case Study
Technology

Published on March 5, 2014

Author: Eltek

Source: slideshare.net

Description

Around the world, updating train-signaling systems is an essential element in improving train travel safety. A key part of these upgrades is ensuring that the underlying DC power system is reliable and as easy to manage and maintain as the signaling system itself.

Eltek is developing a reputation in the rail industry for its advanced DC power technology for train signaling systems as well as its creative solutions for railroads.

In Australia, the company’s Eltek Australian subsidiary worked with Queensland Rail on a system-wide project that will update 40-year-old Ferro resonant power technology at 20 sites with its state-of-the-art systems that will significantly improve the reliability of the train signaling systems.

The Queensland Rail network features nearly 7,000 km of track across South Queensland. The bulk of the company’s business is in passenger train travel, but the company also offers coal and other freight transport services. Queensland Rail had identified 20 sites where the existing power systems were old and limited their operations.
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POWERING QUEENSLAND RAIL’S 7,000KM TRACK NETWORK www.eltek.com

NEW DC POWER SYSTEMS MEAN SAFER TRAINS IN QUEENSLAND Around the world, updating train-signaling systems is an essential element in improving train travel safety. A key part of these upgrades is ensuring that the underlying DC power system is reliable and as easy to manage and maintain as the signaling system itself. Eltek is developing a reputation in the rail industry for its advanced DC power technology for train signaling systems as well as its creative solutions for railroads. In Australia, the company’s Eltek Australian subsidiary worked with Queensland Rail on a system-wide project that will update 40-year-old Ferro resonant power technology at 20 sites with its state-of-the-art systems that will significantly improve the reliability of the train signaling systems. The Queensland Rail network features nearly 7,000 km of track across South Queensland. The bulk of the company’s business is in passenger train travel, but the company also offers coal and other freight transport services. Queensland Rail had identified 20 sites where the existing power systems were old and limited their operations. The problem at those sites was that the maximum capacity of the existing Ferro resonant transformer was 5kVA, which required a number of them in parallel to meet the power demand. In some locations, the cabling to the signal point was long with significant voltage drop. The Ferro resonant transformers did not allow output voltage adjustment to cater to these situations. The transformers themselves were bulky and had relatively low AC-DC power conversion efficiency, which meant they created significant heat that added to the air conditioning load at the sites. The Eltek Solution The Eltek system was built using the company’s Flatpack2 high-efficiency rectifier technology. Flatpack2 features 96% AC-DC power conversion efficiency. Thus the system has very high power density with low heat discharge. The solutions developed for Queensland Rail include 20kVA, 30kVA and 40kVA power systems. Each system includes input and output isolation transformers and is housed in four Eltek Flexible Frame cabinets. The output from the rectifiers was distributed using a 110VDC bus to feed UNV5.0 inverters and a 40kVA STS. Powering Queensland Rail’s 7,000km Track Network 2

The Eltek UPS solution fits into the two-input feed system that Queensland Rail already had in place, requiring very little retrofitting. The primary feed is from the local mains supply. The back-up feed is from the catenary via a step down autotransformer. This supply has a significant noise component with the 21st harmonic of 50 Hz being particularly noisy. The Eltek Australia team designed an LCR notch filter to reject the 21 st harmonic and clean up the input waveform. In the event of a primary source failure, the system automatically switches to the secondary feed. The battery back-up system is designed to continue operations for up for 10 minutes. On return of the primary feed, the system has relay logic to wait until the primary feed has returned for a pre-set period before switching back. 40 Year Old Power System 32kW 40kW AC input DC Output to load 80% efficient DC power system 8kW Lost power (heat) Eltek Power System 38.4kW 40kW AC input DC Output to load 96% efficient DC power system 1.6kW Lost power (heat) Reduction in lost power is 8kW – 1.6kW = 6.4kW Percent reduction in lost power is 6.4kW / 8kW = 80% CONCLUSION Queensland Rail is seeing increases in its ridership thanks to booming population growth. The company is committed to providing safe and efficient transportation to these riders and with the help of Eltek technology; they’ve taken a significant step in maintaining that commitment. Powering Queensland Rail’s 7,000km Track Network 3

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