Analyzing Power Distribution Design to Improve Cost Efficiencies
A construction company in Calgary was about to procure cable for two power distribution projects—50 MVA and 66 MVA—at an oil and gas plant. That’s when Wesco’s engineering team learned about the project from the contractor and saw room for improvement. The customer’s current power distribution design for the oil and gas plant was created by the EPC and required 27 single-conductor cables, 25 kV, 750 kcmil and 1000 kcmil, with 2x27 splices. The engineering team knew they could reduce the number of cables and splices while also decreasing the installation time and cost.
Value Engineering a Better Power Distribution System
- Created value-engineered power cabling design
- Conducted a site visit and inspected the installation equipment setup prior to shipping the cable to ensure it would be ready to install as soon as it arrived
- Performed all cable pulling calculations
- Worked on-site with the customer to provide termination and installation training, answer all questions and oversee installation
The Wesco engineering team utilized ETAP®—electrical engineering software that calculates underground ampacity and performs temperature analysis, among other things—to propose a new power cabling design. The new design brought 27 singleconductor cables down to seven multiconductor cables of 25 kV, 750 kcmil and 1000 kcmil, with no splices. While the previous design required the cables to be buried underground in two separate trenches, each 12.5 and 10 feet wide, 3 feet deep and 5,000 feet long, Wesco’s value-engineered design required only one trench with dimensions of 4 feet wide by 3 feet deep.
Expensive miscalculations like this often occur simply because a more cost-efficient design is unknown. To cut cable costs, a design will sometimes employ a larger trench and single-conductor cable. However, the cost of trenching on a project like this can often outweigh cable costs.
As part of Wesco’s technical expertise, the Wesco engineering team uses the latest software and keeps up to date with standards and local codes to ensure the most cost-efficient design. They calculated their power cabling design would save the customer $2 million on the installation, trenching, cable and splicing.
Saving Time and Money
The customer was very pleased with the results of the project and the time and cost savings provided by the Wesco engineering team.
- Reduced installation time and costs by over 65 percent
- Saved 23 percent on cable
- More reliable system mitigates cost of future maintenance
- Customer returned to Wesco with another project for a 69 kV system
Wesco’s electrical and electronic application engineers bridge the gap between applications designers and installers by offering technical knowledge and best practice insight based on the latest training and years of industry experience.
Construction company for an oil and gas plant
The power cabling distribution design was not cost-efficient
Wesco’s engineering services team used ETAP® software to redesign the power cabling system
- Saved the customer $2 million
- Reduced installation time by two-thirds
- More reliable power distribution system
Transmission Distribution and Substation
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