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RE Developers are Worried of Transmission Woes

RE Developers are Worried of Transmission Woes

Electrical Mirror

Analysis of Electrical Power Systems

21 Feb 2020

Data recorded over the past years show that short circuits have been the major cause(almost 85%)of fire incidents in industries and households alike.

Problem:

Can you Guess, why? Although some people buy quality equipment, yet they don’t maintain them, leading to deterioration in the quality of wire coverings, It has been noticed that overloading electrical circuits leading overheating of the wires causingdamaged insulation resulting into short circuits, 

Solution:

Always use proper sizing of Electrical Equipment as below

Total Load in Circuit (Operational Current in A)

Wire/Cable Current Capacity (Current in A)

Circuit Breaker or Fuse Wire (Current Rating)

Most of people use

What?

Small Installations (1Ø), Repairing Activities

Bigger Installations (3Ø)

Design, Selection Guidance

To Verify Existing Installation Health

Selection Guide

Who?

Certified Electricians

Licensed Contractor

Licensed Consultant

Energy Auditor

Internet or Local Stores

When?

Whenever Required or At least once in 6 Months 

Whenever Required or At least Monthly

Planning

Every 2 Years

Whenever planning to buy

 

An analysis of an electrical power system may uncover energy waste, fire hazards, and equipmentfailure. Facility /energy managers increasingly find that reliability-centered maintenancecan save money, energy, and downtime

 

TROUBLE SHOOTING OF ELECTRICAL POWER SYSTEMS

System Problem

Common Causes

Possible Effects

Solutions

Voltage imbalance among the 3Ø

  • Improper Transformer Tap settings,
  • 1Øloads not balanced among the phases,
  • Poor Connections, Bad Conductors,
  • Transformer Grounds or Faults
  • Motor Vibrations
  • Premature motor Failure
  • 5% imbalance causes 40% increase in Motor Losses

Balance Loads among the phases

Voltage Deviations from Rated Voltages (Too Low or Too High)

  • Improper Transformer Settings
  • Incorrect Selection of Motors
  • Over Voltage in Motors reduces Efficiency, Power Factor & Equipment Life
  • Increased Temperature

Correct Transformer Settings Motor Ratings & Motor Input Voltages

Poor Connections in distribution or at connected loads

  • Loose Busbar Connections
  • Loose Cable Connections
  • corroded connections
  • poorcrimps,
  • loose or worncontactors

 

  • Produces heat
  • causesfailure at connection site
  • leads to voltage drops andvoltage imbalances

Use Infra Red camerato locate hot-spotsand correct.

Undersized  

conductors.

  • Facilities expanding beyondoriginal designs
  •  poor powerFactors
  • Voltage drop
  • Energywaste.

Reduce the load byconservation loadscheduling

Insulation leakage

  • Degradation over time dueto extreme temperatures,abrasion, moisture&chemicals
  • May leak to ground or toanother phase
  •  Variableenergy waste.

Replace conductorsor Insulators

Low Power Factor

Inductive loads such asmotors, transformers, andlighting ballastsNon-linear loads, such asmost electronic loads.

Reduces

  • current-carryingcapacity of wiring
  • voltageregulation effectiveness
  • Equipment life

Add capacitors tocounteract reactiveloads.

Harmonics (Non Sinosoidal voltage and/or current wave forms

  • Office-electronics,
  • UPS
  • Variablefrequency drives(VFD)
  • High intensity dischargelighting,
  • Electronicand core-coil ballasts.
  • Over-heating of neutralconductors, motors,transformers, switch gear.
  • Voltage drop,
  • low powerfactors,
  • Reduced capacity.
  • Take care withequipment selection
  • Isolate sensitiveelectronics from noisycircuits

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