Asset Management

We, at PES, design or assist in the design of an ASSET MANAGEMENT PLAN - a combination of condition monitoring and just in time strategic maintenance activities. Condition monitoring allows strategic maintenance to be scheduled and planned, when it is necessary and is required, not too frequently or early and not to late.​

Performing maintenance too frequently can have very little benefit and be very costly, with plant and equipment being taken out of service and production unnecessarily interrupted.​ Performing maintenance infrequently can equally be very costly with plant and equipment being subjected to unplanned shutdowns and delays. ​

Performing the right maintenance activity at the right time provides best value for you.​ At PES, we have developed electrical asset management procedures, frequency of maintenance activities, recording and verification documents based on the Original Equipment Manufacturer (OEM) recommendations, AS 2467 - 2008 and relevant equipment standards to offer asset management solutions for our customers.

Condition monitoring of power system assets is a very effective strategy used by many successful asset owners. For our clients to maximise the use

of their assets, we provide a service to effectively maintain and monitor them. We also develop asset maintenance strategies and plans and work in conjunction with our clients to implement these strategies.

To assist you with this, we provide the following services.

Power System Scheme Tests

  • Transformer through tests to check transformer
    protection stability

  • Bus Zone primary injection to check stability

Current Transformers (HV & LV)

  •  Ratios, Polarity, Magnetisation Curves, Winding Resistance,
    IR & PI

  •  Dielectric Loss Angle

  •  Partial Discharge (Online & Offline)

Voltage Transformers (HV & LV)

  • Ratios, Polarity, Winding Resistance, IR & PI

  • Dielectric Loss Angle

  • Partial Discharge (Online & Offline)

Power Transformers 

▪ Oil filtration

▪ Regeneration of oil

▪ Basic Transformer Tests

  • Insulation Resistance

  • Vector Group and Polarisation Index Tests 

  • HV and LV Winding Resistance Tests 

  • No Load Voltage Ratio (Transformer Turns Ratio) Test 

▪ Other Tests

  • Short Circuit Test

  • Excitation Current

  • Leakage Reactance/Impedance

  • Dielectric Loss Angle

  • Partial Discharge (Online & Offline)

  • Dielectric Response Analysis (DIRANA) Test 

  • Sweep Frequency Response Analysis (SFRA) Test 

  • Dissolved Gas Analysis and Furan Analysis for Transformers 

▪ Transformer Tap Changer

  • Dynamic Resistance 

Dry Ice Cleaning

▪ Electric Motors

    • HV & LV Stators

    • HV & LV Rotors

Power Lines

    • Pole Inspections

    • Corona Discharge surveys

    • Thermographic surveys

    • Installation 

    • Live line insulator washing

    • Maintenance of pole top hardware (Disconnectors, Isolators etc.)

Protection Relays  

  • Pickup and Drop Out tests 

  • Timing test by Primary and/or Secondary Injection 


HV Cables 

▪ Commissioning tests including

  • Very Low Frequency (VLF) Withstand Test  
  • Tan Delta Test 
  • Insulation Resistance (IR)

  • Polarisation Index (PI)

  • Partial Discharge (Online & Off Line)

High Voltage & Low Voltage Circuit Breakers

▪ SF6 Gas Circuit Breakers

  • Charge with SF6

  • SF6 Leak detection

  • SF6 Gas analysis

  • SF6 Dew Point tests

▪ Electrical tests including

  •  Insulation Resistance

  •  Power Withstand

  •  Polarisation Index

  •  Contact Resistance

                    ▪   Static & Dynamic

  •  Contact Timing

  •  Dielectric Loss Angle

  •  Partial Discharge

                   ▪   Online & Offline


High Voltage & Low Voltage Switchboards

  •  Functional tests, Interlocks etc.

  •  Online and Offline Partial Discharge testing

  • Thermographic Survey

Earth Systems

  •  Soil Resistivity

  •  Earth Grid Impedance

  •  Step & Touch Potential Tests

DC Power Systems

  • Load Tests on Battery Banks