P.O. Box 233

Braham, MN 55006

763-267-3629

 

 

UTILITY LINE DESIGN CALCULATIONS

The following calculations are included in the website, requires minimal training and take seconds to perform. Utility Line Design has over twenty-five planned calculations that will be added to the website at no added charge in the coming months.

Standards and Design Criteria

SURVEYING
Measuring Angles by Tape Measure Method
Measuring Small Angles from Adjacent Pole by Tape Measure Method
Deflection Angle from Two Traverse Bearings
Ground Rise/Depression Along Span


STRENGTH (POLE CLASS, INSULATOR AND POLE SETTING)
Pole Class Based on Unguyed Structure
*Maximum Angle Based on Insulator Strength
*Pole Setting Depth


GUYING
*Minimum Guy Lead on Deadend Poles (Primary Conductor) with Buckling Analysis
*Minimum Guy Lead on Deadend Poles (Secondary Conductor) with Buckling Analysis
*Minimum Guy Lead on Bisector Poles with Buckling Analysis
*Minimum Guy Lead on Tap Poles with Buckling Analysis
Minimum Guy Lead on Tangent Unbalanced Loads with Buckling Analysis
*Stub Pole off of Deadend Poles
*Stub Pole off of Bisector Poles
*Stub Pole off of Tap Poles


CLEARANCE (VERTICAL, HORIZONTAL, BETWEEN CONDUCTORS, UPLIFT)
*Vertical Clearance Analysis - Primary and Neutral
*Vertical Clearance Analysis - Secondaries
*Horizontal Clearance Based on Conductor Blowout (Phase Conductor)
*Horizontal Clearance Based on Conductor Blowout (Secondary Conductor)
Transitional Clearance (Primary and Neutral)
*Maximum Span Based on Horizontal Clearance Between Conductors
*Maximum Span Based on Vertical Clearance Between Conductors
*Maximum Span Based on Conductor Roll
*Uplift Analysis
*Pole Grading
*Staking Table


TRANSFORMER COST AND SIZING
Typical Transformer Sizes
Transformer Cost Based on Load
Transformer Full-Load Current
Transformer Size Based on Residential Monthly kWH
Transformer Size Based on Amps (Single Phase)
Transformer Size Based on Amps (Three Phase)
Transformer Size for Four Wire Delta Secondary


SECONDARY CONDUCTOR SIZING

Secondary Conductor Size Based on Customer Load
Voltage Drop on Existing Load
Voltage Drop Through Transformer


CONDUCTOR SAG AND TENSION
*Ruling Span
Wind Span
*Weight Span
Return Wave Method to Determine Sag
*Sag and Tension Chart for Primary and Neutral Conductors
Primary and Neutral Initial Stringing Chart
Sag and Tension Chart for Multiplex Conductors
Multiplex Initial Stringing Chart
Conductor Gallop Analysis
*Sag for Specific Span Along Ruling Span
Sag for Any Distance Along Level Span
Location of Lowest Sag for Unequal Insulator Elevations


FAULT CURRENT

Three-Phase Secondary Fault Current
Single-Phase Secondary Fault Current
Single Phase Transformer Resistance and Reactance
Three Phase Transformer Resistance and Reactance
Arc Flash (0.48 to 1 kV)
Arc Flash (1 to 15 kV)
Arc Flash - PMH Type Enclosure


SUBSTATION DESIGN
Substation Impedance


CONDUIT SIZING
Minimum Conduit Size


ECONOMICS
Load Factor Calculation
Annual Demand and Energy Losses for Distribution Feeder
Peak Load and Peak Loss Responsibility Factor
Transformer No-Load (Core Loss) Cost


CONVERSIONS AND MATH FUNCTIONS
Temperature Conversion
Horsepower Conversion
Wind Pressure Conversion
American Wire Guage (AWG) Conversion
Unit Length Conversion
Area Conversion
Angle Conversion
Trigonometry Calculations
Scaling Map Measurements












*Denotes calculations are linked to user defined conductor selection, ruling span and design tension

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