Electrical Power Distribution Systems

1 Electrical PowerDistribution Systems3 PDH / 3 CE HoursUnited Facilities CriteriaU. S. Department of DefenseUFC 3-550-03 NPDH AcademyPO Box 449 Pewaukee, WI Education for Architects and EngineersElectrical Power Distribution Systems Final Exam regards to transformer losses, in general, a heavily loaded transformer has lowerlosses, and therefore has _____, than when it is lightly life cycle life life cycle life line regulation, the voltage drop for primary lines shall not respect to cable types, lead-sheathed cable is generally used for submarine(underwater) installations and is in poly-vinyl determining the strength requirements and the adequate physical and structuralrequirements for overhead system support poles, the designer should refer to_____ and ANSI and Beaty, Standard Handbook for Electrical Electrical Institute Wiring and Distribution Reference Volume States Steel Structural Design Guide, 2005 hardware for overhead Systems , in locations sensitive to electromagneticinterference, primary lines should be lead pipes 6.

2 Capacitors raise voltage levels by reducing the reactive line losses associated with _____ between the capacitor installation and the Power supply. a. resistance b. electro-magnetic interference c. reactive current flow d. current distortion 7. Where an underwater cable crossing is subjected to flow or tidal currents, _____ are usually required to prevent excessive drifting or shifting of the cable along the bottom. a. trenches b. conduits c. stand-offs d. anchors 8. Regarding underground cable insulation advantages, _____ are thermosetting, solid dielectric compounds with excellent Electrical insulation properties, good chemical resistance and physical strength characteristics, and both remain flexible at low temperatures.

3 A. both XLP and EPR b. PVC and XLP c. both butyl rubber and EPR d. cambric and silicone-rubber 9. A _____ substation is a unit substation in which the low-voltage section is above 1000 volts. a. load center secondary b. secondary unit rated c. articulated unit d. primary unit rated 10. With regards to transformers, primary unit substations require less land space, are visually less objectionable, and because of the integrated transformer to secondary connection, _____ than separate substation transformers and secondary protective devices. a. are less reliable. b. are more reliable c. are more complicated d. are more difficult to install UFC 3-550-03N 16 January 2004 i CONTENTS Page CHAPTER 1 INTRODUCTION Paragraph 1-1 PURPOSE AND SCOPE.

4 1-1 1-2 1-1 General Building Requirements .. 1-1 Safety .. 1-1 Fire Protection .. 1-1 Antiterrorism/Force Protection .. 1-1 1-3 REFERENCES .. 1-1 APPENDIX A MIL-HDBK 1004/2A, JANUARY A-1 UFC 3-550-03N 16 January 2004A-1 APPENDIX A MIL-HDBK 1004/2A Power Distribution Systems MIL-HDBK-1004/2A15 JANUARY 1992 SUPERSEDINGMIL-HDBK-1004/231 MARCH 1988 INCLUDING NOTICE 115 FEBRUARY 1991 MILITARY HANDBOOKPOWER Distribution SYSTEMSDISTRIBUTION STATEMENT A. APPROVED FOR PUBLIC RELEASE: Distribution ISUNLIMITEDAREA FACRMIL-HDBK-1004/2 AiiABSTRACTThis handbook covers design criteria for electric Power Distribution systemsincluding basic data, overhead and underground Distribution Systems , submarinecable Systems , and substations.

5 The basic design guidance has been developedfrom extensive reevaluation of facilities and is intended for use byexperienced architects and handbook has been developed from an evaluation of facilities in the shoreestablishment, from surveys of the availability of new materials andconstruction methods, and from selection of the best design practices of theNaval Facilities Engineering Command (NAVFACENGCOM), other Governmentagencies, and the private sector. This handbook was prepared using, to themaximum extent feasible, national professional society, association, andinstitute standards. Deviations from this criteria, in the planning,engineering, design, and construction of Naval shore facilities, cannot bemade without prior approval of NAVFACENGCOM HQ Code cannot remain static any more than can the functions it serves or thetechnologies it uses.

6 Accordingly, recommendations for improvement areencouraged and should be furnished to Commander, Pacific Division, NavalFacilities Engineering Command, (Code 406), Pearl Harbor, HI 96860-7300;Telephone (808) HANDBOOK SHALL NOT BE USED AS A REFERENCE DOCUMENT FOR PROCUREMENT OFFACILITIES CONSTRUCTION. IT IS TO BE USED IN THE PURCHASE OF FACILITIESENGINEERING STUDIES AND DESIGN (FINAL PLANS, SPECIFICATIONS, AND COSTESTIMATES). DO NOT REFERENCE IT IN MILITARY OR FEDERAL SPECIFICATIONS OROTHER PROCUREMENT ENGINEERING CRITERIA MANUALSC riteria TitlePAManualMIL-HDBK-1004/1 Preliminary Design ConsiderationsCHESDIVMIL-HDBK-1004/2 Power Distribution Systems PACDIVMIL-HDBK-1004/3 Switchgear and Relaying CHESDIVMIL-HDBK-1004/4 Electrical Utilization Systems 400-Hertz Medium-Voltage Conversion/ SOUTHDIVD istribution and Low-Voltage Utilization SystemsMIL-HDBK-1004/6 Lightning Protection CHESDIVMIL-HDBK-1004/7 Wire Communication and Signal Systems Energy Monitoring and Control

7 Systems ARMYMIL-HDBK-1004/10 Cathodic Protection NCELMIL-HDBK-1004/2 AvPOWER Distribution SYSTEMSCONTENTSPageSection 1 1 Technical 1 1 Current (Ampere) Levels and Interrupting Duties. 1 Equipment 1 Weather 1 Local 1 Economic 2 Number of 2 2 Transformer 2 Special 2 Shore-To-Ship Distribution 3 Good 3 Section 2 OVERHEAD Distribution Circuit 4 4 4 Wire 5 Physical 5 Line 5 5 Heights and 5 Strength 5 Safety 5 Pole 5 5 5 Guys and 6 Safety 6 Design of Earth 6 7 Size 7 Normal Primary 7 Tropical and Semitropical 7 Special Primary 8 Utilization 8 Dissimilar Conductor 8 8 Insulator 8 Dimensions and 8 MIL-HDBK-1004

8 Insulation 9 9 Line 9 Step-Voltage 9 10 10 Pole At-Grade Indoor Overload Transformer Noise Overhead Circuit Interrupting Current Limiting Circuit Automatic Circuit Nonload-Break Load-Break Lightning Contingency Multipurpose Ground Resistance Maximum Ground Grounding Ground Water Pipe Combination of Grounding Ground Overhead Ground Measurement of Ground Service Drop to 15 Section 3 UNDERGROUND Distribution Circuit Direct Trench 16 MIL-HDBK-1004 Cable Draw-In Duct Multipurpose Size of Arrangement of Duct Spare Manholes and Construction of Construction of Underground Single- or Multiple-Conductor Single-Conductor Multiple-Conductor Conductor Annealed Medium-Hard-Drawn Preferred Cable Other Mineral-Insulated Cable Cable Cable Shielded Cable Cable Cable 22 MIL-HDBK-1004 Gas Pressurized

9 Hexaflouride Underground Vault Cable Safety 24 Section 4 SUBMARINE CABLE Preliminary Where Installation Location Hydraulic Variable (Changing) Chemical Composition of Marine Burying Warning Pile Cable Metallic-Sheathed Armored Nonmetallic-Sheathed Electrical Three-Conductor 28 Section 5 General Type of System 30 MIL-HDBK-1004 Typical Substation Indoor Unit Preliminary Short-Circuit Primary Lightning Secondary Secondary Transformer Dry-Type Nondry-Type Insulation Unit Substation Emergency Outdoor Utilization

10 Voltage Secondary Unit Substation 40 Pad-Mounted Compartmental-Type Transformer Units Units 500 Kilovolt-Amperes and Units Larger than 500 Outdoor Distribution Voltage Structure-Mounted Connection to Primary Distribution Substation Site Electric Incoming-Line Circuit Current Limiting Outgoing-Feeder 600 Volts and Over 600 43 MIL-HDBK-1004 Substation Transformer Fire Transformer Lightning Additional Control Energy Control Working Space and Access Existing Grounding Electrode Girdle Grid Special Equipment System Neutral Ground Fault Grounding Fault Portable Safety Metal Locking of Bonding of Legal Warning 48 MIL-HDBK-1004/2 AxiPageFIGURES1 Duct Line 182 Compartmental-Type Transformer 34 3 Radial-Type Articulated Secondary Unit Substation 354 Secondary Unit Substation 365 Preferred Design for a Transmission to Distribution (Primary)