Singer Substation Fact Sheet

The Middletown/Norwalk Project requires a new substation in Bridgeport to provide an interconnection point for power generated locally and the 345kV transmission grid.

In order to maximize the efficiency of the electrical system, it is important to place the proposed substation as close to the point of generation as possible.

The United Illuminating Company (UI) has received approval to build a Gas Insulated (GIS) 115kV/345kV substation. The gas insulated equipment will be placed inside a building. The large transformers and Shunt Reactors will be outside, surrounded by the GIS building and two 35 ft. architecturally designed walls. These walls provide security and noise abatement for the substation.

A noise analysis of the site and design found noise emanating from the substation to be less than the current ambient noise levels and therefore, would not impact the neighborhood.

Current GIS design requires a site with a minimum of 1.54 acres. The equivalent Air Insulated Substation would require 12 acres.

This Gas Insulated Substation features about 400 individual gas containment compartments which are alarmed and continuously monitored for loss of gas. The gas itself is classified as inert, non-toxic, and non-flammable.

The substation will be completely monitored and controlled by state of the art computer systems. All relays are state of the art micro processor based capable of providing protection as well as a wealth of operating information.

When complete, the Singer Substation will be the largest 345-kV GIS Substation in North America.