Electrical Design of Residential Services

Transcription

1 Electrical Design of Residential Services 2006 North Central R.E.C. Engineering Conference Fortune Bay Casino March 8-9,

2 Connexus Energy Facts North Metro area of Twin Cities Mpls.. & St. Paul 1,000 sq. mile Service Territory Urban and Rural Seven Counties 32 governmental jurisdictions

3 Connexus Energy Facts 118,425 Customers year end 05 4,062 new services installed 05 3,192 miles overhead 5,283 miles underground $247,648,556 total utility plant 469MW Summer peak, 335 MW winter

4 Residential Design Plat Application to Service Install Process Plats Engineering Customer Service Specialist Plat application/developers agreement Preliminary plat - Landbase to ROW Specialist (GIS) Work order created WMS Assigned to Construction Design Engineer

5 Residential Design Construction Design Engineer Create preliminary design Street crossing conduit C.E. provides pipe, developer contractor installs Coordinate small utility design for Joint trench Weekly meeting at Connexus Coordinate needs for/with developer Coordinate street lighting - separate designer Target Start Date Material/labor Assess permit needs - apply Final Design Calculate Aid-to to-construction Stake/flag project

6 Development Aid to Construction Charges Single Phase -Urban Development (Public Sewer and Water) Service fee $170 per lot Cable fee 0 to 125 feet per lot average No Charge Excess over 125 feet per lot average $ 5.20 per foot If loop construction is needed $ 2.50 per foot -Rural Development (No Public Sewer or Water) Service fee $295 per lot Cable fee 0 to 300 feet per lot average No Charge Excess over 300 feet per lot average $ 5.20 per foot If loop construction is needed $ 2.50 per foot

7 Residential Design Scheduling Target Start Date Target Completion Date Crew and Equipment resources Material availability All requirements met (permits, $$, grading, etc) One Call Work Order reconciliation

8 Residential Design Construction and Maintenance Joint Trench Coordinator Crew, material Billing, invoicing, etc. C.E. contractor digs trench and installs conductor, basements, etc. C.E. installs Qwest mainline and services C.E. installs CATV mainline (Comcast) Connexus crews install transformers, switchgear, etc., terminates and energize. Xcel gas, Centerpoint gas are partners

9 Residential Design Joint Trench $1.14 million revenue Other intangible benefits - relationships

10 Design Criteria Residential Design Four categories of dwellings Large, medium & small houses and townhouses Voltage drop Primary voltage = 118 V, min. 114 V at meter Load factor = 40% Diversity factor = 1.5 (for large houses = 1.4) Running load power factor = 92% Flicker Calculated at service causing the flicker Uses locked rotor kw of A/C to calc. flicker kw Based on maximum voltage drop of 4% of 114 V A/C motor start power factor = 50% Data verified using test meters

11 Residential Design Townhouses up to 1800 square feet 2.0 ton A/C Diversified peak load per service = 3.4 kw Peak load per service = 5.1 kw Flicker = 8.1 kw Small houses up to 2200 square feet 2.0 ton A/C Diversified peak load per service = 4.4 kw Peak load per service = 6.6 kw Flicker = 9.5 kw Medium houses 2201 to 3800 square feet 3.0 ton A/C Diversified peak load per service = 5.9 kw Peak load per service = 8.8 kw Flicker = 13.0 kw Large houses 3801 to 8000 square feet 4.0 ton A/C Diversified peak load per service = 11.5 kw Peak load per service = 16.0 kw Flicker = 21.3 kw

12 Typical Single Family Large lot

13 Typical High-density plat

14 Typical Single Family

15 Ramsey Town Center

16 Ramsey Town Center

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21 The Lakes of Radisson

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29 Residential Services Connexus received 3900 Residential Service Requests last year 2700 of the requests are single family 1200 are multi family requests 150 have some type of load management equipment Information is received by: Mail Fax On line Customer walk-ins

30 Type of information needed Applicant Responsible party Address OH or URD Service entrance size 320 or larger, load sheet required Load mgmt equipment Date service required

31 Processing requests Request to Customer Service Specialist Creates Work Order Entered into Work Mgmt System Urban platted area Process as NBC (New build and connect) Rural and multi unit buildings to Engineering

32 Urban Requests (New Build and Connect) CSS processes request Creates a work order Target Start Date Directly to Scheduling Dept. Work scheduled when: Grade established Socket mounted Affidavit received

33 Multi-unit unit buildings and rural requests CSS directs request to field designers Designer Field Visit Design R/W permit Target Start date Compatible Units & estimate Sketch Aid to to-construction To Scheduling

34 Single phase residential Single-Phase extension (OH or URD): -Service Fee $ to 850 feet from lot feed point $ 4.50 per foot -Over 850 feet $ 3.85 per foot Includes service processing charge.

35 Secondary Conductor Sizing

36 Secondary Conductor Sizing

37 Secondary Conductor Sizing

38 Scheduling process Hold status Socket mounted Affidavit received R/W permits Grade is established Scheduling Dept. Locates Release job for construction Notify designer for stakes/flags Crew builds job Actual footage Material used ATC applied to customer bill

39 Concerns and challenges Meter base locations. Connexus does not dictate meter base locations but strongly encourages closest corner. Townhome/Apartment services. Ganging of meters is not required but is strongly encouraged. Receiving accurate load information from customer

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46 Questions? Thank you