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  • Energized
  • Deenergized

With a highly qualified and skilled engineering team, KESCO is able to undertake Electrical System Analysis KESA such as Protection System Analysis, Synchronized Analysis and Energy Analysis.

KESA analyzes and predicts:

  • Equipment, feeder and cable loading levels
  • Voltages at every point on the system
  • Existing conditions and loads
  • Proposed load changes
  • System alterations
  • Efficient power factor correction placement

Power Systems Analysis and Protection

In order to coordinate current curves for protective devices, there needs to be a delicate balance between selectivity, system protection, and safety. The requirements to minimize accidents while maintaining coordination has further complicated over the years. KESCO has the experience necessary to provide optimum solutions that will protect people and equipment while simultaneously ensuring maximum system uptime.

KESCO provides the basis for the analysis of electricity through KESA, the use of balanced methodology. Such analysis system is the foundation for the experiences of electrical faults and also the design of protection strategies to safeguard the electrical equipment while maintaining safety of the plant at the best possible level.

KESCO offers to work with KESCO’s clients in a way that is most expeditious and efficient for them. For instance this may mean their technicians working with KESCO’s supervision to complete some of the work. Ultimately KESCO aims to ensure that the client is able to achieve and demonstrate compliance with the relevant parts of the Electricity at Work Regulations.

KESA's expertise includes:

  • Calculation of fault levels
  • Accurate relay settings
  • Expert protection advice, problem investigation and design consultancy
  • Expert elucidation of results

The following KESA areas are covered:

  • Defined of power system faults;
  • Balanced faults and short circuit levels;
  • Fault current transients in machineries;
  • Symmetric components, cycle impedances and networks;
  • The analysis of asymmetrical faults
  • Impact of faults on power system activities;
  • Affecting protection scheme characteristics and consent times;
  • Sustainability of protection schemes;
  • Analysis and application of over-current and distance relay protection schemes to the protection of transmission lines.

Synchronized Analysis

Field engineers carry out measurement and analysis of power system problems,which may cause incorrect operation,or the failure of equipment. Using advanced three-phase power meter technology,KESA is able to provide a Synchronized analysis of energy by enabling the engineer to identify the source of the problem, leading to the best possible solution.

The types of problems, which can be rectified by Synchronized analysis, include:

  • Failure of capacitor banks
  • Nuisance tripping of protection devices
  • Interference with other power users connected to the supply system

Energy Analysis

To complement the simulation of power system performance, KESCO also has the ability to measure power and energy flows through a system. With this service KESA can measure actual loading levels of items in a plant, as well as voltage levels in the system, and precisely identify power factor correction requirements.

Analysis of Motor


Obtaining each diagnosis data in both conditions when motor is in energized or deenergized, finding motor condition through analysis program.


CategoriesMeasurement itemsDiagnosis Contents
DC Insulation resistance, PI measurement Insulation condition Diagnosis
Winding resistance, Capacitance Impedance measurement
Inductance measurement Rotor, Air Gap measurement
Rotor diagnosis Harmonic, Voltage unbalance, Over load driving
Power quality analysis in motion Stator, Rotor condition diagnosis
Starting characteristic Air Cap measurement
Eccentricity analysus  
Analysis of Motor

Diagnosis Object

Low/high voltage and large /small size rotating electrical machine

Expected Effect

The analysis of fine abnomal phenomenon of rotating electrical machihe is availavle

Frequency Response Analysis of Transformer(FRA)


Preventing accidents in advance by detecting the winding state insulation. inside transformllead to mechanical deformation of a patt ia I wind ing of power transformer such as layer short, mechanically transform. damage to structure and relaxation etc

Diagnosis Object

  • Power Transfomer
  • Coredeformation
  • Displacements between high and low voltage windings
  • partial winding distortion
  • shorted or open turns
  • After manufacture of transfomer
  • Integrity verification of transformers after transport
  • Diagnosis after transfomer alarm or protection trippmg
  • Testing after significant changes of monitored values(e.g. combustible gased)
Frequency Response Analysis of Transformer(FRA)

Expected Effectt

  • Detection of mechanical initial failure indcation in advance
  • Easy to analysis the causes of transformer accident
Frequency Response Analysis of Transformer(FRA)

Analysis of Moisture and SO2 in SF6

Measuring moisture in 5F6

Measuring moisture in SF6, and judging whether it is normal or abnormal

  • Characteristics
    - Measuring moisture(PPM), purity(%), Dew / Frost in SF6
Moisture detecting Tester(RH SYSTEM), measurement

Analyzing SO2 in SF6

Measuring SO2 produced by SF6 inside of GIS when it is partially overheated or arced

  • Characteristics
    - Measuring SO2 in SF6 by PPM
    - Improving reliability of diagnosis owing to degitalization.
SO2 detecting tester(GFG), measurement

Diagonosis Object

SF6 in GIS

Expected Effect

Early detection of insulation aging progress and abnormality inside GIS

Gas Analysis of Insulating Oil


Detecting local overheat, partial discharge, insulation capacity of Insulation Oil, etc through gas analysis of insulating oil

Analyzing SO2 in SF6

  • Analyzing of 10 different types of gas by Gas Chromatography
    - H2, O2, N2, CO2, C2H2, C2H4, C2H6, CH4, CO, C3H8
  • Standardizing sample collection and analys is process management
  • Marking and agreement on maintaining accuracy of analysis equipment
  • Reliabi lity management of analysis through multiple operating in the same line of equipment

Diagonosis Object

Oil Transformer

Expected Effect

GC7890A Diagnosis Data
  • Early detecting partial discharge and arc discharge in Transfomer
  • Analyzing characteristics condition of Transformer
  • Building database and managing trend


  • Checking the transfomer generating abnormal gas
  • As a result of analyzing development of gas generation, a large amount of abnormal gas like C2H2 produces
Generated gas (PPM)TCGVariationVerdictReference
2008.12 0 0 189 132 134 127 582 - normal  
2009.11 236 141 7,658 1,241 3,073 5,106 17,455 16,873 dangerous  
2009.12 366 156 8,387 1,333 3,869 5,282 19,393 1,938 dangerous reanalysis
Gas Analysis of Insulating Oil

Analysis of Moisture of Insulating Oil


Analyzing insulation capacity by measuring moisture of insulation oil


  • Using Coulometric Kart Fisher titration
  • Analyzing the content of moisture by measuring quantity of electricity
  • Analyzing precisely moisture in insulating oil by blocking moisture flowed from the outside
Analysis data , electronic scale

Diagnosis Object

Oil Transfomer

Expected Effect

Comprehending insulation characteristic of insulating oil of transformer

Analysis result

Analysis data

Analysis of Power Qualityl


  • Monitoring and analysis of power system in motion
  • Measurement of voltage & current, analysis of vector
  • Measurement of power factor & frequency
  • Incoming-Distrbution analysis of harmonic
Power Quality Analyzer (DEWETRON)


Analysis of power quality including voltage, current, frequency, wave form, etc

Voltage change graph, frequency graph

Diagnosis Object

Instrument transformer(VT, CT, etc)

Expected Effect

  • Measuring suggestion for filter installation of hamonic disable fac ilities.
  • Effciency improvement through the follow-up service for facilities completed renovation.