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Cost Saving and Excellent Payback for US Exchange Carrier - an Eltek Case Study

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Information about Cost Saving and Excellent Payback for US Exchange Carrier - an Eltek...
Technology

Published on March 5, 2014

Author: Eltek

Source: slideshare.net

Description

Switching to Eltek Valere’s Scalable DC Power System Delivers Excellent Payback for Leading Local Exchange Carrier
Scalable DC power solutions provide efficiency, flexibility and space savings resulting in excellent ROI and short payback period
Telecom network power systems are some of the most durable systems in a central office (CO) – sometimes lasting for decades. But when these systems start to fail and replacement or maintenance costs begin to rise, it is time to evaluate the costs of ongoing repair versus replacement. This is the situation in which a large U.S. local exchange carrier found itself with nearly a dozen of its central offices across the country.
This Eltek Valere customer is one of the largest local exchange carriers in the United States and provides local, long distance, high-speed data and wireless services to both residential and business customers.
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An Eltek Valere Case Study Switching to Eltek Valere’s Scalable DC Power System Delivers Excellent Payback for Leading Local Exchange Carrier Scalable DC power solutions provide efficiency, flexibility and space savings resulting in excellent ROI and short payback period Telecom network power systems are some of the most durable systems in a central office (CO) – sometimes lasting for decades. But when these systems start to fail and replacement or maintenance costs begin to rise, it is time to evaluate the costs of ongoing repair versus replacement. This is the situation in which a large U.S. local exchange carrier found itself with nearly a dozen of its central offices across the country. This Eltek Valere customer is one of the largest local exchange carriers in the United States and provides local, long distance, high-speed data and wireless services to both residential and business customers. The ferroresonant power plants in several of the company’s COs had been in service for as long as 14 years and were beginning to fail. While replacing the failed rectifiers was expensive, it was more favorable for capital expenditures (CAPEX) than buying an entire DC power system. However, there were several other factors that undermined this apparent economy. The ferro plants were very heavy and took up a significant amount of floor space. The power plants achieved only 77 percent efficiency at best, which meant considerable waste by lost power. This low efficiency drove up electric utility operating expenses (OPEX). Additionally, the poor efficiency generated considerable heat in each CO, requiring increased cooling and further increasing electricity OPEX. These rising costs came at a time when power demands were increasing due to new service activation and growth in the customer base. Finding the right answer meant optimizing the return on the investment, satisfying both CAPEX and OPEX considerations. The carrier’s network operations and engineering teams set a two-year payback objective for any power system to be purchased. With this goal in place, the procurement process began. One of the leading contenders was Eltek Valere’s Scalable DC Power Plant, which boasts up to 94.5 percent efficiency and total a capacity of up to 10,000 amps. The Scalable DC power system is highly configurable and designed for easy expansion to satisfy the evolving needs of the central office. The heart of the system is Eltek Valere’s Powerpack rectifier—a three-phase, 200A rectifier. Up to 15 of these rectifiers can be installed in a 24-inch wide bay for a maximum total output of 3000A. Up to three Powerpack bays can be combined into a single Scalable DC Power Plant capable of providing up to 10,000A of DC output. The Powerpack bays can be configured to accept a three-phase AC input voltage of either 208/240VAC or 480VAC (depending on the rectifier model) and power one or two rectifiers per AC feed. Embedded control and monitoring devices provide comprehensive local management through bay-mounted displays. The remote management interface is supported over a variety of communication protocols, including SNMP and a web-based HTTP interface. For the carrier, one of the operational benefits of the Scalable Plant was that it operated with the existing distribution bays and copper cabling, thus saving the cost of replacing the entire system. Even with that benefit, however, the team wanted to be sure that the dramatic efficiency improvement would be realized in the network, and that Eltek Valere’s claim of achieving the highest efficiency rate over competing power solutions was real. The team tested the system. Their test results verified Eltek Valere’s efficiency claims, so the power team made the decision to implement Eltek Valere’s Scalable DC Power system.

Efficiency, Flexibility and Space Savings Increased efficiency was one of the main drivers for the carrier’s transition to the Eltek Valere Scalable DC Power system, which provides a nearly 20 percent increase in efficiency over the carrier’s legacy system. Another benefit of the Eltek Valere system is its flexibility. The Powerpack rectifier bays that make up the Scalable system can provide up to 3000 amps each and feature integrated rear bulk buses that can scale in capacity to 6,000 or 10,000 amps. The carrier’s central offices require 1200 amps of power, and because the Eltek Valere Powerpack rectifier bay can provide up to 3000 amps in a single bay, the customer was able to replace four of its existing bays with a single Powerpack bay. This resulted in a great deal of space savings, which provided extra space to implement other revenue-producing equipment. Success With the Scalable DC Power system upgrade, this regional U.S. carrier has experienced substantial cost savings and an excellent payback period. The company has eliminated the ongoing costs of servicing its aging systems. Because the Eltek Valere system generates significantly less heat than the legacy equipment, the customer is able to save air conditioning costs as well. The team particularly appreciated that the payback period is a short 13 months—nearly halving the initial two-year payback period. The customer started its central office upgrade with one location in Texas and has completed a total of 10 upgrades with Eltek Valere systems throughout its U.S. locations. In the future, the company will expand its upgrade plans to include an outside plant using Eltek Valere’s V-Series rectifiers, which provide compact, high-efficiency power solutions for outdoor applications.

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