The proposed project includes:
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- Constructing approximately four kilometers (km) of above-ground 240 kV transmission line from the Clover Bar Substation, located at 1515 – 130 Avenue to a proposed customer owned substation within the Air Products' site located in the Clover Bar Area;
- Adding two 240 kV circuit breakers, associated switches and equipment within the existing Clover Bar Substation fence line.
What will the new transmission line look like?
If approved, the 240 kV transmission line will be built above ground using monopole structures, with heights up to approximately 40 metres (m). Base width can range from 1.5 m to 3.0 m depending on the type of foundation selected through the design process. The poles will be single-circuit, meaning they will have three wires strung across them and an overhead optical ground wire on top. The average distance between structures will be approximately 300 m.
Lattice steel structures, wood poles, or structures with wider bases, and the use of guy-wires may be required at certain locations along the line. These structures may be installed where the line turns corners or has to span larger distances.
Structure details and locations of these structures will be dependent on the route approved and the final design.
Proposed transmission line routing considerations
During the process of determining potential routes, EPCOR takes the following factors into consideration in an effort to find routes with the lowest overall impact:
- Special Constraints
- Existing Infrastructure
We compared the relative effects of these factors and identified three potential route options for the proposed transmission line as shown in the Map and diagrams section. We proposed these route options because they generally follow existing linear disturbances such as roadways, designated transportation utility corridors and existing underground utilities.
After receiving input from the public, considering the potential environmental impacts and reviewing technical requirements, EPCOR will submit a Facility Application to the Alberta Utilities Commission (AUC) that identifies a preferred route and an alternative route. If the AUC approves this project, only one of the proposed routes will be constructed between the Clover Bar Substation and the proposed Air Products' substation.
To accommodate the proposed transmission line, two new 240 kV circuit breakers, associated switches and equipment will be required at the Clover Bar Substation. All the substation alterations will be within the fence line of the substation; the substation fence line will not change.
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow.
Transmission lines and substations
Transmission lines are like highways, moving high-voltage electricity from generating stations to distribution points (called substations) where the high-voltage electricity gets stepped down to lower voltages.