RR Credit: Distribution Redundancy and Auto Restoration

(1-2 points)

Applicable to: Cities & Utilities, Campuses, Transit

INTENT

To improve reliability and resilience by ensuring that grid power can be supplied via multiple distribution pathways.

REQUIREMENTS

All projects

Demonstrate the ability to sustain customer power with the use of redundant distribution and automated power restoration in case of an interruption within the project.

Calculate the percentage of circuits protected using the following formula:

Where:

%DRe = Percentage of circuits that have distribution redundancy or the percentage of customers connected to circuits with distribution redundancy.

ANS = Average number of redundant switches per circuit (i.e., the number of switches on circuits with distribution redundancy divided by the number of circuits with distribution redundancy).

%AR = Percentage of circuits that have automated restoration or the percentage of customers connected to circuits with automated restoration.

ANAS = Average number of automatically restored switches per circuit (i.e., the number of switches on circuits with automated restoration divided by the number of circuits with automated restoration).

Points are awarded according to Table 1.

Table 1. Points for distribution redundancy and auto restoration

Circuits Protected (%)	Points
≥ 30	1
50	2

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