Electrical

Electrical November 1, 2000

Substations and Feasibility

The economic feasibility of converting a substation from distribution to transmission service can be determined from the following relationship:NAS = SAV + DEREG - CONV - OM, where:NAS = Net annual savings.SAV = Annual savings due to switching from the distribution tariff to the transmission tariff.DEREG = Estimated annual savings due to buying power in a deregulated environment.

By Consulting Specifying Engineer Staff
Electrical November 1, 2000

GM Lab Exemplifies Hazardous Design

As the largest noise, vibration and harshness lab in North America, the design of General Motor's 347,000-square-foot Noise and Vibration Analysis Laboratory in Milford, Mich., involved comprehensive hazardous area design by engineers from HarleyEllis, Southfield, Mich.

By Consulting Specifying Engineer Staff
Electrical October 1, 2000

Optical-fiber network saddles

Optical-fiber network saddles for use in routing fiber-optic cable are designed with rounded edges to provide a smooth surface between the mount and the cable. This helps prevent potential stress on the cable and damage to insulation resulting from snagging or abrasion. Saddles are available in single-capacity versions for a maximum bundle size of 1.

By Staff
Electrical October 1, 2000

Radiant floor-heating pump

Radiant floor-heating pump improves control and energy use in primary- and secondary-piping configurations.

By Staff
Electrical October 1, 2000

AC adjustable-frequency drives

AC adjustable-frequency drives save up to 40 percent of fan-motor energy compared to standard fixed-airflow systems. In cooling-tower applications, drives reduce fan noise and eliminate fan cycling as well as the need for output-water throttling valves, while maintaining water at design temperatures.

By Staff
Electrical October 1, 2000

Transformer protector

Transformer protector is designed exclusively for primary-side applications on distribution substation transformers rated up to 60 MVA at138 kV. Electrically linked, manually reset pole-units provide less than 1/4-cycle, three-phase tripping simultaneity. The device is compatible with any relay-tripping system.

By Staff