trans-rupter ii® transformer protector—model ex… is ... · s&c featured solution:...

CASE STUDY IMPROVING RELIABILITY S&C Featured Solution: Trans-Rupter II Transformer Protector Location: Utah, United States Trans-Rupter II® Transformer Protector—Model EX… Is Integral to New Generation Project Customer Challenge After a wave of nearby brownouts and nearly 20 years without any significant expansion in generation capacity, a large utility in northern Utah decided to install five new 40-MW gas-turbine “peakers” in a newly developed industrial park. A pipeline running past the park would provide a steady supply of clean- burning, economical natural gas. The turbines would be individually brought on-line to increase capacity during peak periods. Each turbine would include a generation substation comprised of a 45/60/75-MVA, 13.8-kV to 138-kV step-up transformer, protective device, bus-work, and switchgear. Since limited space was available in each substation, the transformer protective device needed to be very compact. S&C Solution The utility decided to purchase five 138-kV S&C Trans- Rupter II Transformer Protectors, Model EX. With its lightweight, space-saving design, the Trans-Rupter II Transformer Protector was ideal for the application. And its simple installation procedure was appreciated, given the utility’s tight construction schedule. The S&C-supplied mounting pedestals come with pre-wired conduit, so wiring was quick and easy. A vertical-break disconnect was installed on the transmission side of the Trans-Rupter II Transformer Protector to provide a visible break and pick up transformer magnetizing current. The “take-off tower” was installed directly over the disconnect to save even more space. Using differential relays housed in the turbine control house, a separate protection scheme was set up for each substation. Results The Trans-Rupter II Transformer Protector was ideal for this application, and the utility is very satisfied to have five new, efficient gas-turbine plants…providing enough power for nearly 120,000 homes! 40-MW gas-turbine generation “peaker” plant. 138-kV Trans-Rupter II, Model EX protects step-up transformer. June 3, 2019 © S&C Electric Company 2003-2019, all rights reserved sandc.com 731-1004

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CASE STUDYIMPROVING RELIABILITY

S&C Featured Solution: Trans-Rupter II Transformer Protector

Location: Utah, United States

Trans-Rupter II® Transformer Protector—Model EX… Is Integral to New Generation Project

Customer ChallengeAfter a wave of nearby brownouts and nearly 20 years without any significant expansion in generation capacity, a large utility in northern Utah decided to install five new 40-MW gas-turbine “peakers” in a newly developed industrial park. A pipeline running past the park would provide a steady supply of clean-burning, economical natural gas.

The turbines would be individually brought on-line to increase capacity during peak periods. Each turbine would include a generation substation comprised of a 45/60/75-MVA, 13.8-kV to 138-kV step-up transformer, protective device, bus-work, and switchgear.

Since limited space was available in each substation, the transformer protective device needed to be very compact.

S&C SolutionThe utility decided to purchase five 138-kV S&C Trans-Rupter II Transformer Protectors, Model EX. With its lightweight, space-saving design, the Trans-Rupter II Transformer Protector was ideal for the application. And its simple installation procedure was appreciated,

given the utility’s tight construction schedule. The S&C-supplied mounting pedestals come with pre-wired conduit, so wiring was quick and easy.

A vertical-break disconnect was installed on the transmission side of the Trans-Rupter II Transformer Protector to provide a visible break and pick up transformer magnetizing current. The “take-off tower” was installed directly over the disconnect to save even more space. Using differential relays housed in the turbine control house, a separate protection scheme was set up for each substation.

ResultsThe Trans-Rupter II Transformer Protector was ideal for this application, and the utility is very satisfied to have five new, efficient gas-turbine plants…providing enough power for nearly 120,000 homes!

40-MW gas-turbine generation “peaker” plant.

138-kV Trans-Rupter II, Model EX protects step-up transformer.

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